Moroccan Ephedra: Traditional Uses
Moroccan Ephedra: Traditional Uses
Reviews
            Authors
            Mounia Chroho 1, Christian Bailly 2, 3, Latifa Bouissane 1
            Affiliations                                                            Correspondence
            1 Molecular Chemistry, Materials and Catalysis Laboratory,              Prof. Dr. Christian Bailly
               Faculty of Sciences and Technologies, Sultan Moulay                  Institute of Pharmaceutical Chemistry Albert Lespagnol (IC-
                                                                                                                                                                                 This document was downloaded for personal use only. Unauthorized distribution is strictly prohibited.
               Slimane University, Beni-Mellal, Morocco                             PAL), Faculty of Pharmacy, University of Lille
            2 OncoWitan, Scientific Consulting Office, Lille, France                3 rue du Professeur Laguesse, BP-83, F-59006 Lille, France
            3 Institute of Pharmaceutical Chemistry Albert Lespagnol,               Phone: + 33 (0) 3 20 96 43 74, Fax: + 33 (0) 3 20 97 42 01
               Faculty of Pharmacy, University of Lille, France                     christian.bailly@univ-lille.fr
            Keywords                                                                AB STR AC T
            Ephedra, Ephedrae herba, plants from Morocco, traditional               Ephedra species are among the most popular herbs used in
            uses, biological activities                                             traditional medicine for a long time. The ancient Chinese
                                                                                    medical book “Treatise on Febrile Diseases” refers to the clas-
            received                          September 24, 2023
                                                                                    sic traditional Chinese medicine prescription Ge Gen decoc-
            accepted after revision           February 1, 2024
                                                                                    tion, which consists of seven herbs, including an Ephedra spe-
            published online                  February 29, 2024
                                                                                    cies. Ephedra species are utilized all over the world to treat
            Bibliography                                                            symptoms of the common cold and coughs, and to combat
            Planta Med 2024; 90: 336–352                                            major human diseases, such as asthma, cancers, diabetes,
            DOI 10.1055/a-2269-2113                                                 cardiovascular and digestive disorders, and microbial infec-
            ISSN 0032‑0943                                                          tions. This study aimed at identifying specific Ephedra species
            © 2024. Thieme. All rights reserved.                                    used traditionally in Morocco for therapeutic purposes. The
            Georg Thieme Verlag KG, Rüdigerstraße 14,                               plant parts, their preparation process, and the treated pathol-
            70469 Stuttgart, Germany                                                ogies were identified and analyzed. The results revealed five
                                                                                    ethnobotanically important species of Ephedra: Ephedra alata
            Correspondence                                                          Decne, Ephedra altissima Desf., Ephedra distachya L., Ephedra
            Prof. Dr. Latifa Bouissane                                              fragilis Desf., and Ephedra nebrodensis Tineo. These species
            Molecular Chemistry, Materials and Catalysis Laboratory, Fac-           are used traditionally in Morocco for treating people with dia-
            ulty of Sciences and Technologies, Sultan Moulay Slimane                betes, cancer, rheumatism, cold and asthma, hypertension,
            University                                                              influenza virus infection, and respiratory ailments. In addition,
            Campus Mghila, BP 523, 23000 Beni-Mellal, Morocco                       they are occasionally used as calefacient agents, to regulate
            Phone: + 21 25 23 48 51 12, Fax: + 21 25 23 48 52 01                    weight, or for capillary care. Few studies have underlined the
            l.bouissane@usms.ma                                                     antibacterial and antioxidant activities of some of these Mo-
                                                                                    roccan Ephedra species, but little information is available re-
                                                                                    garding the natural products at the origin of the bioactivities.
                                                                                    Further phytochemical investigations and clinical data are en-
                                                                                    couraged to better support the use of these plants.
      336                                                      Chroho M et al. Ethnobotanical Uses and …   Planta Med 2024; 90: 336–352 | © 2024. Thieme. All rights reserved.
                                                                                                                                                                      This document was downloaded for personal use only. Unauthorized distribution is strictly prohibited.
    ▶ Fig. 1 Illustrations of Ephedra species found in Morocco. a Ephedra alata, b Ephedra altissima, c Ephedra fragilis, and d Ephedra nebrodensis (by
    Jean-Paul Peltier, licensed under CC BY‑NC 4.0.) e Ephedra distachya [32]. Their traditional medicinal uses are either well described (+), not reported
    (−), or remains questionable (*in the case of E. distachya).
plants, largely distributed in arid and semiarid regions of the                               These undesirable reactions were generally related to the pres-
world, also carry ecological and economic values [11, 12].                                    ence of ephedrine-type alkaloids [21, 22]. The alkaloid ephedrine,
    Over 60 Ephedra plants have been identified [4, 11]. The POWO                             often present in Ephedra herb extracts, mediates sustained excita-
database has listed 167 species, including 78 with accepted                                   tory effects via activation of the α-2a adrenoceptor [23]. Over the
names          (https://powo.science.kew.org/results?f = species_f%                           past 10 years, the development of an ephedrine alkaloid-free
2Caccepted_names&q=Ephedra). Ephedra species can be found                                     Ephedra herb extract has been recommended for safer use by hu-
in Europe, southern and eastern Asia (notably in China and Japan),                            mans, with reduced side effects [21, 22, 24, 25]. Ephedrine-free
North America (southwestern United States and northern Mexi-                                  Ephedra herb extract and derived products can be used to treat
co), the western part of South America, and in Africa, from North                             various diseases, including COVID-19, for example [2, 26].
Africa to the horn of Africa. Ephedra species grow in desert, arid,                               Ephedra species are used as medicinal plants in African and
and semiarid conditions, most often on dry, rocky, or sandy soil.                             Mediterranean countries. For example, the species Ephedra foemi-
They are often considered desert shrubs, but some species can                                 nea Forssk is a traditional medicinal plant in the Eastern Mediter-
be found in riverbeds and grasslands [10, 13].                                                ranean region [27]. In Lebanon, this plant offers a popular remedy
    In traditional medicine, the uses of Ephedra species are ex-                              to treat inflammation and bacterial infections [28]. The species
tremely diversified. They are utilized to treat respiratory affec-                            Ephedra nebrodensis Tineo growing in Algeria is largely used to
tions, such as cough, symptoms of the common cold and asthma,                                 combat inflammatory and oxidative damage [29, 30]. The two
or as a deobstruent or emollient. These plants are also used to                               species Ephedra alata and Ephedra altissima growing in Tunisian
treat disorders of the cardiovascular and digestive systems, ail-                             arid zones are used traditionally to treat chills, coughs, fever, and
ments of the urinary tract, cancers, diabetes, as well as bacterial,                          bronchial asthma [31]. In the present work, we have identified the
viral, and fungal infections [14, 15]. Other studies mention the use                          Ephedra species used specifically in Morocco (▶ Fig. 1). We inven-
of Ephedra species for the treatment of edema, fever, and allergies                           toried their traditional medicinal uses by local populations and the
[1, 2, 16, 17]. Ephedra extracts are also considered as dietary sup-                          main bioactive products and associated pharmacological activ-
plements, notably for weight loss [18, 19]. However, it is impor-                             ities have been analyzed. The aim of this analysis is to highlight
tant to mention that despite the recognized benefits of Ephedra                               the use of Ephedra species in Morocco, to encourage further stud-
herbs on human health, adverse effects have occasionally been re-                             ies on the plantʼs pharmacological activities, and to try to provide
corded, such as excitation, agitation, palpitation, dysuria, arrhyth-                         a scientific rational for their medicinal usage.
mia, elevated blood pressure, dizziness, and insomnia [2, 20, 21].
Chroho M et al. Ethnobotanical Uses and …   Planta Med 2024; 90: 336–352 | © 2024. Thieme. All rights reserved.                                               337
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   ▶ Fig. 2 Distribution of the five species of Ephedra around the world (maps defined from the Global Biodiversity Information Facility [gbif.org]) [33,
   42, 47, 54, 57].
338                                                          Chroho M et al. Ethnobotanical Uses and …   Planta Med 2024; 90: 336–352 | © 2024. Thieme. All rights reserved.
                                                                                              or inhaled to treat respiratory ailments. There is also a mention of
    ▶ Table 1 Ephedra species of Morocco and their locations.
                                                                                              massage using a decoction to treat rheumatoid arthritis [34]. De-
                                                                                              coctions made from the aerial parts of E. altissima are used to treat
    Ephedra              Location in Morocco                            Reference
    species                                                                                   diabetes and cancer. However, this product should be used with
                                                                                              care because it can induce neurological damages, notably dizzi-
    Ephedra              Laâyoune Sakia El Hamra region                 [35]
    alata
                                                                                              ness or vertigo [20]. E. alata is perhaps a safer species, with no ma-
                         Tarfaya Province                               [36]                  jor toxicity reported, in particular, no hallucinogenic effect when a
                         Tata Province                                  [34]                  plant decoction is used for oral treatment of diabetes in the Za-
                                                                                              gora region of Morocco [76]. However, caution is required be-
    Ephedra              Atlas Mountains, Imouzzer re-                  [44–46]
    altissima            gion                                                                 cause Ephedra preparations containing the alkaloid ephedrine
                                                                                              may cause hypotension and spontaneous abortion in pregnant
    Ephedra              Southern Morocco                               [71, 72]
    fragilis
                                                                                              women [77].
                         Oulad Teima, Taroudant                         [44, 55]
                         Souss-Massa region                                                   Pharmacological activities of Ephedra extracts
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    Ephedra              Central Middle Atlas                           [15]                  and associated bioactive products
    nebrodensis                                                                               Experimental studies performed with plant extracts made from
                         High Atlas                                     [60]
                                                                                              Moroccan Ephedra are rare, but there are a few useful reports
                         Tichoukt Mountain, Middle Atlas                [56]
                                                                                              (▶ Table 3) that can be completed with studies using the same
    Ephedra              Southern Morocco                               [49, 50]              species collected from other countries. Thereafter, the plant ex-
    distachya
                                                                                              tract activities are discussed in turn.
Chroho M et al. Ethnobotanical Uses and …   Planta Med 2024; 90: 336–352 | © 2024. Thieme. All rights reserved.                                                339
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  ▶ Fig. 3 E. alata with the extraction and purification process developed to efficiently extract isoquercetin [35] (photo of the plant from POWO
  [https://powo.science.kew.org]).
  Ephedra           Local vernac-        Therapeutic tradi-              Part of the             Method of                        Moroccan study                Refer-
  species           ular name            tional uses                     plant used              preparation                      area                          ences
  Ephedra           Timitrte             Antidiabetic                    Leaves                  Leaf decoction as-               Central Middle At-            [15]
  nebrodensis                                                                                    sociated with Apium              las region
                                                                                                 graveolens and Pet-
                                                                                                 roselinum sativum
  Ephedra           Daghmous             Cancer                          Leaves, stems           Decoction (oral                  Greater Casablanca            [14]
  alata             Elaalnda                                                                     administration)
Chdida Rheumatism, colds Leaves, stems Oral powder Tarfaya Province [36]
                    Tamatrt              To gain weight, cale-           Leaves,                 Oral, inhalation,                Tata Province                 [34]
                                         facient, diabetes,              branches                massage
                                         asthma, hyperten-
                                         sion, colds, influenza,
                                         respiratory ailments,
                                         rheumatoid arthritis
  Ephedra           Tougel argan         Diabetes                        Stems, leaves,          Decoction/oral                   Chtouka Ait Baha              [79]
  altissima                                                              and whole                                                and Tiznit (West-
                                                                         plant                                                    ern Anti-Atlas)
  Ephedra           Azrm                 Hair care and diabetes          Aerial part             Decoction                        Northeastern                  [81]
  fragilis          Amater                                               Leafy stems                                              Morocco
340                                                           Chroho M et al. Ethnobotanical Uses and …   Planta Med 2024; 90: 336–352 | © 2024. Thieme. All rights reserved.
    ▶ Table 3 Studies about Ephedra species from Morocco.
    Ephedra           Aerial parts, etha-           Enzyme inhibitory and               Antioxidant and inhibitory activities against diverse enzymes         [35]
    alata             nol extract                   antioxidant activities;             (acetyl- and butyryl-cholinesterase, α-amylase, elastase, hya-
                                                    extraction of isoquerce-            luronidase). Optimization of the extraction process for iso-
                                                    tin                                 quercetin (recovery: 1034 µg/g of extract using optimized pa-
                                                                                        rameters: EtOH concentration, liquid-solid ratio, extraction
                                                                                        time, extraction temperature, and ultrasonic power).
    Ephedra           Roots, methanolic             Anti-staphylococcal ac-             Antibacterial activities of the extract, notably against Staphylo-    [45]
    altissima         extract                       tivity                              coccus epidermidis and two strains of Staphylococcus aureus.
                      Roots, methanolic             Antileishmanial activity            The alcoholic extract was found active against Leishmania in-         [46]
                      extract                                                           fantum (IC50 = 490.8 µg/mL).
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    Ephedra           Aerial parts, sev-            Antioxidant, anti-glyca-            Marked antioxidant activity of the ethyl acetate fraction. Iden-      [55]
    fragilis          eral organic ex-              tion activities; chemical           tification of rutin, quercetin, caffeic, ferulic acid, gallic acid,
                      tracts                        composition                         and vanillic acid.
                      Aerial parts, ethyl           Cytoprotective effect               Protection of Tetrahymena pyriformis cells from oxidative stress      [83]
                      acetate extract                                                   induced by hydrogen peroxide.
ing antioxidant and anti-inflammatory effects [16], notably asso-                             ity of the plant against type 2 diabetes [101]. The activity has
ciated with the presence of glycosylated flavonoids such as iso-                              been associated with the presence of flavone glycosides, such as
rhamnetin-3-O-rutinoside, isoschaftoside, and kaempferol-3-O-                                 isovitexin-2-O-rhamnoside, kaempferol-3-O-rhamnoside, and
rhamnoside [95]. There is also mention of antidiabetic and anti-                              quercetin-3-O-rhamnoside found in the ethyl acetate extract
bacterial activities with this plant [96–99]. Aqueous extracts of E.                          [102]. The flavonoid content is higher in E. altissima compared to
alata contain diverse flavonoids but also alkaloids, phenolic com-                            E. alata. This has been evidenced when comparing the seeds of
pounds, and steroids useful to improve wound healing [100].                                   the two plants (both collected in Southern Tunisia). The former
                                                                                              contained significantly more flavonoids but also more polyphe-
Ephedra altissima Desf.                                                                       nols and more condensed tannins than the latter species. As a re-
This Ephedra species is native to the north of Africa (Morocco, Al-                           sult, the antioxidant potential of an E. altissima seed extract was
geria, Tunisia, Libya, and Mauritania), the Canary Islands, and                               found to be markedly higher than that of an E. alata seed extract.
Chad. A plant sample collected in the Atlas Mountains in the Im-                              The predominant bioactive natural products were gallic acid,
ouzzer region of Morocco has been used to prepare both aqueous                                quercetin, epicatechin, naringin, and the atypical flavone cirsiliol
and methanolic extracts of E. altissima that were then tested for                             (3′,4′,5-trihydroxy-6,7-dimethoxyflavone) [31] (▶ Fig. 4 a). Cirsi-
their antibacterial activities. The aqueous extracts were found in-                           liol is an interesting compound regulator of mitophagy in cancer
active, whereas methanolic extracts made from the plant roots re-                             cells [103], apparently acting as an inhibitor of tyrosine kinase
vealed a modest activity against Staphylococcus aureus [strain                                TYK2 (KD = 0.8 µM) in cancer cells and tumors [104]. Its anticancer
ATCC 29 213, which is a classical methicillin-resistant (MRSA)                                effects have been well evidenced using different cell lines and tu-
strain]. The antibacterial activity was noticeable but weak com-                              mor models in recent years [105, 106]. It is also a potent antioxi-
pared to that measured with other Moroccan plants, such as Ber-                               dant molecule capable of binding to the enzyme F1Fo-ATP syn-
beris hispanica, for example [45]. The authors also evaluated the                             thase [107] and a compound that can mitigate amyloid-β (Aβ) ag-
capacity of the plant extracts to inhibit the growth of the promas-                           gregation, therefore being of potential interest to treat neurode-
tigote forms of Leishmania parasites, responsible for cutaneous                               generative disorders [108]. This compound is probably a major
leishmaniasis. The extract from E. altissima revealed a modest ac-                            contributor to the bioactivities of E. altissima.
tivity against Leishmania infantum (IC50 = 490.8 µg/mL) [46].                                      The plant contains many other compounds, including alka-
These are the only studies performed with samples of E. altissima                             loids, tannins, saponins, and cardiac glycosides, identified after
collected in Morocco.                                                                         extraction with various organic solvents, notably with the plant
    Other studies have evaluated the bioactivities of E. altissima ex-                        leaves extracted with ethanol [109]. Phenols, sterols, saponins,
tracts but with plant specimens collected from other countries. In                            tannins, terpenoids, flavonoids, and alkaloids have also been iden-
particular, a recent work evidenced the antibacterial effects of an                           tified in an E. altissima stem methanolic extract, and this extract
ethyl acetate extract from an Algerian sample of the plant (col-                              was found to affect male mice reproductive functions [110]. The
lected in Bouhmama County). It revealed inhibitory activities                                 same methanolic extract was found to exhibit a dose-dependent
against the two enzymes, α-amylase (IC50 = 8.07 µg/mL) and pan-                               (500–3000 mg/kg) central nervous system depression and a mild
creatic lipase (IC50 = 289.1 µg/mL), coupled with an anti-inflam-                             antipsychotic activity without anxiolytic-like effects in mice [111].
matory effect (IC50 = 126.4 µg/mL), possibly explaining the activ-                            It is interesting to note that the fresh stems of this species contain
Chroho M et al. Ethnobotanical Uses and …   Planta Med 2024; 90: 336–352 | © 2024. Thieme. All rights reserved.                                                        341
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   ▶ Fig. 4 E. altissima with the extraction process used to extract various natural products from the seeds, including the flavonoid cirsiliol or the
   glutamate uptake inhibitor L‑CCG III (cis-α-(carboxycyclopropyl) glycine) from the fresh stems of the plant (photo of the plant from https://www.
   teline.fr; photo credit: Jean-Claude Thiaudière).
neither ephedrine nor pseudoephedrine, but they contain sub-                      E. nebrodensis, notably a marked dose-dependent capacity to re-
stantial amounts of the two cis-diastereoisomers of the L-gluta-                  duce croton oil-induced ear edema in mice. The antioxidant effect
mate analogue (2S,3S,4R)-2-carboxycyclopropyl)-glycine (L-                        has been correlated to the high content of polyphenolics, flavo-
CCGIII) and (2S,3R,4S)-2-(carboxycyclopropyl) glycine (L-CCGIV)                   noids, and tannins [30, 61]. Cell protective effects were also ob-
(▶ Fig. 4 b). These two rare 2-(carboxycyclopropyl)-glycine (CCG)                 served. A 1 : 1 ethanolic : acetone extract from the aerial parts of
derivatives (which constitute about 1 % of the stem dry weight in                 the plant (collected from Arzana Province, Sardinia, Italy) has
the plant) alter neurotransmission. They selectively activate sub-                shown a protective effect against cardiovascular damages in-
groups of glutamate receptors depending on stereochemistry. In                    duced by the anticancer drug doxorubicin in rats. The level of the
mammalian neurons, L-CCGIII potentiates responsiveness to L-                      antioxidant defense enzymes (GSH and SOD) was increased and
glutamate and L-CCGIV activates the N-methyl D-aspartate                          lipid peroxidation was reduced [115]. A phytochemical analysis
(NMDA) subtype of the L-glutamate receptor [112]. These com-                      performed using an essential oil from the related species E. nebro-
pounds provided the foundation for the design of novel modula-                    densis Tineo ex Guss. subsp. nebrodensis (from Italy) has shown the
tors of NMDA receptors [113].                                                     presence of numerous volatile sesquiterpene hydrocarbons (citro-
                                                                                  nellol, β-patchoulene, etc.) [116, 117]. Much the same type of ter-
Ephedra nebrodensis Tineo (ex Guss.).                                             penes have been found in other Ephedra-based volatile oils, such
This Ephedra species is a Mediterranean medicinal plant well dis-                 as (E)-phytol (10.1 % in the oil of E. fragilis), and benzaldehyde
tributed in Morocco and Algeria and is also found in Italy. It is a               and cis-calamenene (8.0 and 3.6 %, respectively, in the oil of E. dis-
Macaronesian-Mediterranean nanophanerophyte growing in dry                        tachya) [118]. Two phenolic glycosides designated nebrodensides
and rocky places [114]. A 1 : 1 ethanolic : acetone crude extract                 A and B (▶ Fig. 5) have been isolated from the aerial parts of this
prepared from the aerial parts of a plant sample collected in Urzu-               plant, together with (−)-epicatechin and (−)-ephedrine. The two
lei (Sardinia, Italy) has shown antioxidant and hypotensive effects,              compounds were found inactive against proliferation of Madin-
as well as antinociceptive and anti-inflammatory activities. The                  Darby canine kidney (MDCK) cells and the influenza A virus [58].
presence of ephredrine-type alkaloids was suspected [59]. The                     Nebrodenside A has been found in Dodonaea viscosa (L.) (Spinda-
presence of ephedrine and pseudoephedrine (▶ Fig. 5) was evi-                     cea) and shown to exert anti-inflammatory and analgesic proper-
denced later when Hamoudi and coworkers performed a phyto-                        ties [119]. The compound has been isolated from the herb Leonto-
chemical screening of the same plant (aerial parts) collected in Al-              podium leontopodioides (Willd.) Beauv. (Asteraceae) and charac-
geria. They identified the alkaloids together with phenolic com-                  terized as a modest inhibitor of lipase and α-glucosidase enzymes
pounds and a large fraction of flavonoids with antioxidant proper-                (IC50 = 12.3 and 6.1 µM, respectively) [120]. The same product
ties [29, 61]. They further characterized the antioxidant, anti-in-               was isolated from the aerial parts of Phagnalons ordidum L. (also
flammatory, and analgesic effects of a hydroalcoholic extract of                  Asteraceae) and shown to exert antioxidant activity [121]. Re-
342                                                          Chroho M et al. Ethnobotanical Uses and …   Planta Med 2024; 90: 336–352 | © 2024. Thieme. All rights reserved.
                                                                                                                                                                   This document was downloaded for personal use only. Unauthorized distribution is strictly prohibited.
    ▶ Fig. 5 E. nebrodensis and the chemical structures of alkaloids ephedrine and pseudoephedrine and the two phenolic glycosides nebrodensides A–
    B (photo of the plant from https://www.teline.fr; photo credit: Jean-Paul Peltier).
    ▶ Fig. 6 E. fragilis (stems) with a representation of the frugivorous lizard Podarcis lilfordi, which consumes the plant seeds and importantly contrib-
    utes to their dispersion. The phenolic compound gallic acid (isolated from the stems) contributes to the antioxidant properties of the extract
    through interaction with the receptor for advanced glycation end products (RAGE; molecular structure from PDB: 2MOV) (photo of the plant from
    https://www.teline.fr; photo credit: Jean-Paul Peltier).
cently, a computational study has suggested that this compound                                tors to the dispersion of the plant seeds, such as the frugivorous
could be used as an inhibitor of severe acute respiratory syndrome                            Balearic lizard Podarcis lilfordi Günter (Lacertidae) [123, 124].
coronavirus 2 (SARS‑CoV‑2) responsible for COVID-19, owing to                                 Through its intense frugivorous activity, this lizard plays a more
its capacity to bind to the receptor-binding domain of the virus                              important role than insects in pollination and seed dispersal
Spike glycoprotein [122].                                                                     [125] (▶ Fig. 6).
                                                                                                  In Morocco, the plant can be found in the Souss-Massa region
Ephedra fragilis Desf.                                                                        (Taroudant Province). An authenticated sample collected in the
The evergreen species E. fragilis (vernacular name: joint pine) is a                          city of Oulad Teima, near Taroudant, has led to the preparation
fleshy-fruited tall scrambling shrub (up to 1.8 m) growing essen-                             of an ethanolic extract further fractionated using ethyl acetate
tially on rocky hills and stone walls. It is native to the eastern Med-                       (EA). This EA fraction has revealed a high content of phenolic and
iterranean region of southern Europe and Northern Africa, and                                 flavonoid compounds and strong antioxidant activity. The fraction
from Madeira and the Canary Islands (Spain). It grows primarily                               protected cultured cells (from Tetrahymena pyriformis) against ox-
in the subtropical biome. Small animals are important contribu-                               idative stress injury induced by hydrogen peroxide, protecting
Chroho M et al. Ethnobotanical Uses and …   Planta Med 2024; 90: 336–352 | © 2024. Thieme. All rights reserved.                                            343
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   drans A–E can be isolated. These water-soluble polymers exhibit
   antioxidant and hypoglycemic properties [35] (photo of the plant             antioxidant activity and modulates proinflammatory cytokines
   from https://inpn.mnhn.fr; photo credit: P. Rouveyrol).                      [138].
                                                                                Ephedra distachya L.
                                                                                This shrub species (also known as Ephedra vulgaris Rich. or sea
these cells from DNA damage and metabolic oxidation. The ex-                    grape) is a major component of desert vegetation. It can be found
tract showed potent antioxidant activities [55]. The extraction                 in North Africa (Morocco, Algeria) but also in sand dunes of tem-
process has been optimized and several bioactive compounds                      perate deserts, such as the Gurbantünggüt desert in the Junggar
were isolated from the modified EA fraction, notably four phenolic              Basin (northwestern China), and in Central Asia, for example [139,
compounds (caffeic acid, ferulic acid, gallic acid, and vanillic acid)          140]. It can be found as well in clay steppes of the Ulyanovsk re-
and two conventional flavonoids (rutin and quercetin). The phe-                 gion in Russia [141], the Balkan Peninsula in Serbia [142], and the
nolic derivatives were characterized as the main components re-                 dunes of Letea in Romania [143, 144].
sponsible for both antioxidant and antiglycation activities of the                  From a phytochemical viewpoint, this species has been less in-
extract [83]. A complementary molecular modeling analysis (in sil-              vestigated than the other aforementioned species. This herb is
ico) suggested that gallic acid can form stable complexes with the              rich in catechins, which possess antioxidant activities [145], and
receptor for advanced glycation end product (RAGE) [83]                         also contains large amounts of pseudoephedrine (1.25–1.59 % of
(▶ Fig. 6). This is not surprising because these phenolic derivatives           dry weight), a sympathomimetic used to treat symptoms of the
present high affinities for the different proteins of the HMGB1/                common cold and flu, sinusitis, asthma, and bronchitis [74]. The
RAGE/NF-κB signaling pathway and gallic acid is known to reduce                 subspecies E. distachya subsp. helvetica (from Vienna, Austria)
the risk of AGE-mediated cellular complications, preventing fibro-              was shown to contain 20.8 mg of (pseudo)ephedrine per gram of
sis induced by advanced glycation end products [126–128].                       dry weight, which is less than the content in E. fragilis (27.1 mg/g)
    Total organic carbon (TOC) is particularly high in E. fragilis com-         [43]. However, the ephedrine content may vary substantially from
pared to other plants growing on semiarid Mediterranean soils                   one plant to another because another study indicated that ephe-
[129]. Nevertheless, this species contains many less phenolic                   drine was not detected in the species E. distachya subsp. helvetica
compounds than the other studied Ephedra species (notably 8-                    [146]. Its content in phenolic and flavonoid compounds is not par-
fold less phenols than E. alata) and less flavonoids as well, but a             ticularly high (largely inferior to that found in E. alata, for exam-
high content in ephedrine alkaloids [43]. The main characteristic               ple), but this species does present a high content of total alkaloids
of E. fragilis is the presence of the two alkaloids, pseudoephedrine            (15.8 mg/g compared to 0.2 mg/g in E. fragilis) [43]. These alka-
and ephedrine, in the different parts of the plants. Pseudoephe-                loids have not been characterized formally but the phylogenetic
drine is a stereoisomer of ephedrine (▶ Fig. 5) that is commonly                similarities between E. distachya and the well-studied analogous
used as a nasal decongestant in combination with other anti-in-                 species Ephedra sinica [147] suggest that it may contain similar al-
flammatory drugs for the symptomatic treatment of some com-                     kaloids such as the ephedrannins largely present in E. sinica [148].
mon pathologies such as the common cold. The alkaloid content                   Cell suspension cultures (callus) of E. distachya have been devel-
is very high in E. fragilis flowers, which contain both alkaloids               oped and used to elicit the production of phytoalexin p-coumar-
(1.86 %) whereas the seeds essentially contain pseudoephedrine                  oylamino acids by the addition of a yeast extract to the culture
(0.62 %) and the branches a little quantity of ephedrine (0.054 %),             [149–151].
as determined with a specimen of E. fragilis from Malta [130].                      A characteristic of E. distachya is the content in glycans called
Ephedrine and pseudoephedrine can exert immunomodulatory                        ephedrans A, B, C, D, and E, with hypoglycemic and antioxidant
activities. Notably, pseudoephedrine has been shown to modulate                 activities [48] (▶ Fig. 7). They have a different molecular mass
T cell activation, via the inhibition of interleukin-2 (IL-2) and TNF-α         (from 6.6 × 103 to 1.5 × 106 Da) and varied monosaccharide com-
gene transcription in stimulated Jurkat T cells, thereby inhibiting             positions, with the presence of trehalose and xylose in ephedrans
the transcriptional activity of proteins JNK and AP-1 (activator pro-           A and B, and various proportion of rhamnose and arabinose [148].
tein-1) [131]. Similar T cell deactivation effects have been re-                These polysaccharides also display anti-inflammatory activity
344                                                        Chroho M et al. Ethnobotanical Uses and …   Planta Med 2024; 90: 336–352 | © 2024. Thieme. All rights reserved.
[152]. Similar polysaccharides with antihypertensive and antioxi-                             tory action of isoschaftoside found in E. alata, for example [95].
dant activities have been characterized in other species, such as                             This compound is a potent antioxidant and an anti-inflammatory
E. alata [153].                                                                               agent with an anti-steatosis activity useful to combat metabolic
                                                                                              liver disease [165, 166]. Other flavonol glycosides, such as iso-
Clinical trials with Ephedra-based products                                                   rhamnetin-3-O-rutinoside, contribute similarly to the antioxidant
Medicinal products containing Ephedra extracts or ephedrine are                               and anti-inflammatory effects [16]. This compound is also a pro-
not frequently used nowadays due to the adverse effects reported                              apoptotic agent, useful to limit the growth of cancer cells [167]. It
with Ephedra preparations in the past (see Discussion below).                                 would be interesting to apply network pharmacology approaches
However, there are rare clinical trials that concern Ephedra, nota-                           to determine how these different metabolites participate and co-
bly with Chinese medicines containing Mahuang (Ephedrae her-                                  operate to promote the activity of the plant extract. This type of
ba). For example, trial NCT03733873 has evaluated the Ephedra-                                approach has proved useful to predict the combinatorial effects of
containing Chinese medicine Suoquan for the treatment of noc-                                 Ephedrae herba components [162, 168–170].
turnal enuresis [154]. Trial NCT00432991 evaluated the effect of                                   Evidently, alkaloids are essential components of the extracts,
intramuscular ephedrine on the incidence of nausea and vomiting                               most of them containing either ephedrine and/or pseudoephe-
                                                                                                                                                                      This document was downloaded for personal use only. Unauthorized distribution is strictly prohibited.
in women during and after a Cesarean section. The objective was                               drine. Their content varies from one Ephedra species to another,
to reduce or prevent hypotension [155]. Ephedrine and phenyl-                                 depending on diverse plant growth parameters, such as altitude.
ephrine can be safely used to counteract hypotension after spinal                             It has been observed recently with another species (Ephedra saxa-
anesthesia in obstetric patients, but the safety of the product ad-                           tilis) that the ephedrine content increased as the altitude gradient
ministration requires careful monitoring [156, 157]. We will not                              increased, and pseudoephedrine decreased as the altitude gra-
discuss further ephedrine-based trials so as to maintain a focus                              dient decreased [171]. There is also a seasonal variation of the al-
on Ephedra plants and extracts.                                                               kaloid content [161]. Their concentrations vary greatly according
                                                                                              to plant species, the collection location, and cultivation conditions
                                                                                              [172, 173]. Both ephedrine and pseudoephedrine are key medici-
Discussion                                                                                    nal components of almost all Ephedra, and their contents in Ephe-
Plants of the Ephedraceae family and Ephedra species in particular                            dra formulations can be precisely estimated from the compound-
are used in many countries all over the world to treat human dis-                             ing amount of the starting Ephedra plant [160]. They are useful
eases. One of the most popular Ephedra-based medicinal herbs is                               medications to prevent or treat hypotension, for example, owing
the one called Mahuang in Chinese, which corresponds to the her-                              to their indirect sympathomimetic pharmacodynamic properties
baceous stem of E. sinica Stapf, Ephedra intermedia Schrenk et C. A.                          [174] but their use remains controversial, because they can also
Mey., and Ephedra equisetina Bge. [158]. Mahuang decoctions                                   induce cardiovascular side effects, including stroke and heart at-
(Ephedrae herba) are largely used in China to treat asthma, liver                             tack [175, 176]. Pseudoephedrine was considered potentially
disease, skin disease, and other diseases [4, 5]. Ephedrae herba                              more useful than ephedrine due to its anorexigenic effect and its
(Maoto) is also used in traditional Japanese medicine (Kampo)                                 capacity to influence lipolysis and thermogenesis. But the use of
[159, 160], based notably on the cultivation of E. sinica [161]. The                          this product is also associated with effects on the cardiovascular
same species is also used in the Republic of Korea, notably to com-                           and central nervous systems. Its prescription to obese patients is
bat obesity [162, 163]. Ephedra species can be found on all conti-                            not at all recommended [177]. These considerations have
nents and many of them are associated with traditional medicinal                              prompted the development of ephedrine alkaloid-free Ephedra
usage. The bracts of Ephedra cones have played a crucial role in                              herb extracts [21, 24, 178]. Beyond flavonoids and alkaloids, Ephe-
long-distance seed dispersal that is responsible for a wide distribu-                         dra extracts also contain useful terpenoids, carboxylic acids, tan-
tion of the genus in semiarid and arid areas of Eurasia, North Afri-                          nins, and other types of constituents such as unsaturated fatty ac-
ca, North America, and South America [164]. Ephedra species are                               ids [55, 97, 179, 180]. The polysaccharides found in the stems of E.
commonly exploited for their anti-inflammatory, anticancer, anti-                             alata are particularly interesting products due to their contribu-
bacterial, antioxidant, hepatoprotective, anti-obesity, antiviral,                            tion to the antihypertensive and antioxidant activities of the ex-
and diuretic activities [11, 148]. To our knowledge, seven Ephedra                            tracts [153]. Ephedra polysaccharides warrant further considera-
species are present in Morocco, including five used traditionally to                          tion to improve their identification and contribution to extract ac-
treat diverse symptoms and/or pathologies (Fig. ▶ 1). Four species                            tivities [181, 182].
are clearly listed as being used to treat inflammatory diseases                                    Ephedrine was well recognized as a dependable asthma treat-
(such as rheumatism) or other pathologies: E. alata (the most fre-                            ment in the Western world by the mid-1930 s. Primitive inhalers
quently used species), E. altissima, E. fragilis, and E. nebrodensis.                         were created to provide ephedrine alkaloids, and they become
The ethnobotanical use of E. distachya in Morocco is very likely,                             the main oral asthma medications in the 1940 s and 1950 s [3].
but firm evidence is lacking. Nevertheless, this species is with no                           Ephedrine was widely used and readily available, but over time, it
doubt a medicinal plant used in the surrounding Mediterranean                                 was realized that the alkaloid was more toxic than initially
area.                                                                                         thought.
    The medicinal activities of Moroccan Ephedra extracts can be                                   Ephedra was appointed as a weight-loss and energy-en-
linked to the presence of diverse bioactive products, in particular                           hancement supplement in the US in the 1990 s and early 2000 s.
ephedrine-type alkaloids and glycosylated flavonoids. Among the                               It was categorized as an herbal supplement under the Dietary
many beneficial flavonoids, one can underline the anti-inflamma-                              Supplement Health and Education 1994 [183, 184]. No evidence
Chroho M et al. Ethnobotanical Uses and …   Planta Med 2024; 90: 336–352 | © 2024. Thieme. All rights reserved.                                               345
   Reviews
proved Ephedra’s effectiveness other than short-term weight loss.              constituents and their mechanism of action. The validated names
However, the number of reported adverse events increased [185].                of the different Ephedra species have been checked (http://www.
In 2004, the Food and Drug Administration (FDA) in the United                  worldfloraonline.org, accessed on September 10, 2023).
States received over 18 000 reports of harmful events associated
with Ephedra, and banned dietary supplements with ephedrine al-
kaloids [4, 185]. The same ban of Ephedra was imposed in the
                                                                               Conclusion and Outlook
European Union by the European Commission in 2015. Among                       Five medicinal Ephedra species present in Morocco were identi-
the toxic responses to Ephedra use are increased blood pressure,               fied, namely, E. alata, E. altissima, E. distachya, E. fragilis, and E. ne-
excitement, sweating, and dysuria, in addition to more serious                 brodensis. They are used locally in the Moroccan traditional phar-
events like arrhythmia, nephritis, gallstones, and possibly death              macopeia to treat a variety of human diseases, such as asthma,
due to myocardial infarction and stroke or respiratory failure [4,             rheumatism, hypertension, diabetes, cancer, and other patholo-
183, 184].                                                                     gies. The pharmacological evidence necessary to support their
    Altogether, our analysis identified the Ephedra species used tra-          clinical use remains somewhat insufficient at present for these
ditionally in Morocco and provided useful information to establish             Moroccan species. Further studies are encouraged to better sup-
                                                                                                                                                                            This document was downloaded for personal use only. Unauthorized distribution is strictly prohibited.
links between the pharmacological effects observed with the                    port the medicinal use of these plants.
plant extracts and the nature of bioactive natural products identi-
fied in those preparations. Moroccan Ephedra plants, notably the               Contributorsʼ Statement
two most frequently used regional species E. alata and E. altissima,           Data collection: M. Chroho; Design of the study: C. Bailly, L. Bouis-
represent key medicinal plants for the country. Their traditional              sane; Drafting the manuscript: M. Chroho, C. Bailly, L. Bouissane;
use can be encouraged, but always with caution due the presence                Investigation: C. Bailly, L. Bouissane; Visualization: C. Bailly, L.
of potentially harmful ephedrine-type alkaloids [18, 183, 185].                Bouissane; Revision and editing of the manuscript: L. Bouissane;
Their use should be accompanied with health information when-                  Supervision of the final version of the manuscript: C. Bailly, L.
ever possible. In this respect, the danger of using Arabic YouTube             Bouissane.
videos regarding herbal cancer treatment has been pointed out
recently [186]. There is no reason to ban the traditional use of Mo-           Funding Information
roccan Ephedra extracts to treat some human infections, notably
inflammatory symptoms, making profit of the abundance, relative                      This research did not receive any specific grant from funding agencies in
safety, and beneficial functional attributes of the products. But it                 the public, commercial, or not-for-profit sectors.
would be useful to assess the toxicological profile of such extracts
in parallel, so as to better understand the efficacy, safety, and              Acknowledgements
quality of the available products.
    Finally, beyond the health benefits, it is interesting to note that              The authors are thankful to Sultan Moulay Slimane University, Morocco,
                                                                                     for partial support.
the same type of Moroccan Ephedra extracts can be used in the
field of green chemistry. An aqueous plant extract of E. alata has
                                                                               Conflict of Interest
proved efficient when used as a reducing and capping agent for
the synthesis of copper oxide nanoparticles [187]. Similarly, other
                                                                                     The authors declare that they have no conflict of interest.
Ephedra extracts have been used to prepare various types of com-
posite nanoparticles [187–190]. A bright future may be antici-
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