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Preface
The chief aim of writing a book titled Herbal Drugs as Therapeutic Agents
is to highlight the contribution of herbal drugs to pharmacology and
in drug discovery. My previous book on Herbalism, Phytochemistry and
Ethnopharmacology was well received and this motivated me to write
a book on therapeutic scope of herbal drugs. Several herbal drugs and
isolated constituents have entered clinical trials in recent times and positive
outcomes have been reported.
Herbal medicine is going to play a significant role in future healthcare
industry. In the past, medicinal plants have provided us with life-saving
drugs, particularly in oncology. To name a few—atropine, digoxin, morphine,
paclitaxel, pilocarpine, reserpine, scopolamine, topotecan and vincristine.
However, several of these compounds have outlived their usefulness in
light of better alternatives.
Herbal medicine is interdisciplinary subject and the expert herbal
scientist blends traditional herbal medicine with botany, ethnobotany,
phytochemistry, pharmacognosy, pharmacology and allopathic medicine.
A large part of the world’s population depends upon traditional herbal
medicine for their daily health requirements, especially in developing
countries. Even in industrialized countries the use of plant-based remedies
is widespread and numerous pharmaceuticals are based on or derived from
plant compounds.
The book starts with a chapter on reported pharmacological activities of
withanolides, followed by a chapter targeting anticancer role of withaferin A.
The chapter on CAM studies some common anticancer therapies. Succeeding
chapters throw light on pharmacological investigations on berberine,
protopine, piperine, liriodenine, andrographolide, hypericin, hyperforin and
above all, anthrquinones. A chapter has been dedicated to alkaloids from
Indian medicinal plants and data on pharmacological investigations.
The chapter on anti-arthritic and anti-acne drugs reviews drugs that
are beneficial for treatment of arthritis and acne vulgaris. Pharmacological
vi Herbal Drugs as Therapeutic Agents
Amritpal Singh
List of the Abbreviations
µg : a microgram
µM : The micrometre
EC50 : half maximal effective concentration
ED50 : In vitro or in vivo dose of drug that produces 50% of its maximum
response or effect
Ex vivo : Taking place outside a living organism
G2-M : cell cycle phase
i.d. : Intradermal route of drug administration
i.g. : Intragastric route of drug administration
i.l. : Intralesional injection
i.m. : Intramascular route of drug administration
i.v. : Intravenous
IC50 : The half maximal inhibitory concentration
In vitro : Taking place in a test-tube, culture dish or elsewhere outside a
living organism
In vivo : Taking place in a living organism
IP : Intraperitoneal injection
PO : Oral (by mouth) route of drug administration
SC : Subcutaneous route of drug administration
Contents
Preface v
List of the abbreviations vii
Chapter 1
Withanolides—Phytoconstituents with Significant
Pharmacological Activities 1
1.1 Introduction 1
1.2 Previous Reported Work 2
1.3 Recent Advances in Pharmacological Activities 4
1.3.1 Antitumor 5
1.3.2 Anti-inflammatory and Anti-oxidant 10
1.3.3 Anti-cholinesterase 11
1.3.4 Neuroprotective 11
1.3.5 Angiogenesis Inhibitor 12
1.3.6 Diuretic 12
1.3.7 Hypoglycemic 13
1.3.8 Immunosuppression 13
1.3.9 Miscellaneous 13
References 15
Chapter 2
An Insight into Anticancer Mechanism of Withaferin A 20
2.1 Introduction 20
2.2 Studies on Anticancer Activity 20
2.3 Experiential Studies on Anticancer Activity of Withaferin A 21
2.3.1 Effect of Withaferin A on 180 Tumor Cells 21
2.3.2 Cytotoxic Effects of Withaferin A on P388 Cells 21
2.3.3 Ehrlich Ascites Carcinoma and Withaferin A 21
2.3.4 Radiosensitizer Effect in V79 Cells 21
2.3.5 Role of Withaferin A in Fibrosarcoma and Melanoma 22
2.3.6 Inhibition of Angiogenesis 22
2.3.7 Mediation of Action through by Annexin II 22
x Herbal Drugs as Therapeutic Agents
Chapter 3
Complementary and Alternative Medicine Approaches
in the Treatment of Cancer 28
3.1 Introduction 28
3.2 Complementary and Alternative Methods for
Cancer Management 28
3.3 Essiac Herbal Formula 29
3.4 Cartilage 30
3.5 Gerson Therapy 31
3.6 Specific Botanicals 31
3.6.1 Mistletoe Extracts 31
3.6.2 Dietary Phytochemicals 31
3.7 Conclusion 35
References 35
Chapter 4
Review of Anticancer and Cytotoxic Potential of
Sesquiterpenoids 37
4.1 Ixerin Z and 11,13A-dihydroixerin Z 37
4.2 Torilin, 1b-hydroxytorilin, and 1a-hydroxytorilin 38
4.3 Scabertopin, Deoxyelephantopin and Isodeoxyelephantopin 38
4.4 Inulacappolide 38
4.5 Germacranolide Sesquiterpene Lactones Isolated from
Carpesium triste var. manshuricum 39
4.6 Costunolide, b-cyclocostunolide, Dihydro
Costunolide and Dehydro Costuslactone 39
4.7 Millerenolide and Thieleanin 40
4.8 Dihydro-b-agarofuran Sesquiterpenes of Celastrus vulcanicola 41
4.9 Santamarine, 9b-acetoxycostunolide and 9b-acetoxyparthenolide 41
4.10 Furanodiene 42
4.11 Germacrane-type Sesquiterpenoids from Magnolia kobus 42
4.12 Chloroform Extract of Carpesium rosulatum 43
Contents xi
Chapter 5
Berberine—Alkaloid with Broad Spectrum of
Pharmacological Activities 46
5.1 Introduction 46
5.2 Berberine from Chinese Medicinal Plants 47
5.3 Pharmacological Studies—Pre-clinical 47
5.3.1 Anti-proliferative and Anti-migratory Activity 47
5.3.2 Antimicrobial Activity 47
5.3.3 Gastrointestinal System 50
5.3.4 Hepatoprotective Activity 51
5.3.5 Cardiovascular System Activity 51
5.3.6 Central Nervous System Activity 53
5.3.7 Genitourinary System 54
5.3.8 Anti-oxidant Activity 55
5.3.9 Absorption of Berberine 55
5.3.10 Clinical Studies 56
5.3.11 Conclusion 57
References 57
Chapter 6
Protopine—An Isoquinoline Alkaloid with
Diverse Pharmacological Profile 61
6.1 Introduction 61
6.2 Pharmacology 61
6.2.1 Antithrombotic and Anti-inflammatory Activity 61
6.2.2 Analgesic Activity 62
6.2.3 Antispasmodic Activity 63
6.2.4 Anticholinesterase and Anti-amnesic Activities 63
6.2.5 Anti-asthmatic Activity 63
6.2.6 Cardiovascular Activity 64
6.2.7 Neuroprotective Activity 65
6.2.8 Antidepressant Activity 65
6.2.9 Hepatoprotective Activity 65
6.2.10 Antimicrobial Activity 66
References 67
Chapter 7
Piperine—Review of Advances in Pharmacology 69
7.1 Introduction 69
xii Herbal Drugs as Therapeutic Agents
Chapter 8
Pharmacological Profile of Oxoaporphine Alkaloid, Liriodenine 79
8.1 Introduction 79
8.2 Pharmacology 79
8.2.1 Anticancer 79
8.2.2 Antimicrobial 80
8.2.3 Cardiovascular System 81
8.2.4 Central Nervous System (C.N.S) 82
References 82
Chapter 9
Recent Experimental Advances in Hepatoprotective Potential
of Andrographolide 84
9.1 Introduction 84
9.2 Diterpene Lactones of A. paniculata 84
9.3 Previous Reported Work on Andrographolide 85
9.4 Recent Findings 85
References 86
Chapter 10
Profile of Hypericin-Napthodianthrone from
Hypericum perforatum Linn. 88
10.1 Napthodianthrones of Hypericum perforatum Linn. 88
10.2 Biosynthesis of Hypericin in Hypericum elodes 89
10.3 Antidepressant Activity 89
10.3.1 Interaction with Cholinergic and s Receptors 89
10.3.2 Hypericin and Monoamine Oxidase Inhibition 89
Contents xiii
Chapter 11
Hyperforin-Acylpholoroglucinol with
Significant Antidepressant Potential 96
11.1 Acylpholoroglucinols of Hypericum perforatum Linn. 96
11.2 Biosynthesis of Hyperforin 97
11.3 Antidepressant Activity 97
11.3.1 Comparative Study of Two H. perforatum Extracts
(Difference in Hyperforin Content) 97
11.3.2 Inhibition of the Neurotransmitters by Hyperforin 98
11.3.3 Physicochemical Interaction of Hyperforin with
Specific Membrane Structures 99
11.3.4 Similarity in Action of Fluoxetine and Hyperforin 99
11.4 Cognitive (anti-amnesic) and Neuroprotective Activities 100
11.4.1 Cognitive 100
11.4.2 Neuroprotective 100
11.4.3 N-methyl-D-aspartate-antagonistic 100
11.4.4 Antidementia 101
11.5 Anxiolytic Activity 101
11.6 Antitumour Activity 101
11.7 Anti-inflammatory Activity 101
11.8 Scope of Hyperforin in Dermatological Research 102
11.9 Alcholism and Hyperforin 102
11.10 Pharmacokinetics 103
11.11 Drug Interactions 103
References 104
Chapter 12
Survey of Indian Medicinal Plants for
Alkaloids and Pharmacology 107
12.1 Introduction 107
12.2 Materials and Methods 108
12.3 Results 108
12.3.1 Antimicrobial 108
12.3.2 Digestive System 109
xiv Herbal Drugs as Therapeutic Agents
Chapter 14
Rajpatha-Ethno Medicine of Controversial Origin 130
14.1 Introduction 130
14.2 Varieties of patha 130
14.3 Distinction between Cycela peltata and
Stephania hernandifolia 131
14.4 Ethnopharmacology of Cycela peltata Auct.
non (Lamk) Hook. f. & Thomson. & Thomson. 131
14.4.1 Distribution and Botany 131
14.4.2 Phytochemistry 131
14.4.3 Traditional Medicinal Use 131
14.4.4 Pharmacological Research 132
14.5 Ethnopharmacology of Stephania hernandifolia (Willd) Walp. 132
14.5.1 Botany 132
Contents xv
Chapter 15
Phytopharmacology of Indian Nootropic
Convolvulus plauricaulis L. 137
15.1 Introduction 137
15.2 Materials and Methods 137
15.3 Results 138
15.3.1 Central Nervous System 138
15.3.2 Heart 139
15.3.3 Miscellaneous Activity 139
15.3.4 Drug Interactions 140
15.3.5 Conclusions 140
References 140
Chapter 16
Viscum album Linn.—Valuable Anticancer Herbal Drug 142
16.1 Introduction 142
16.2 Botany 142
16.3 Phytochemistry 142
16.4 Review of Medicinal Properties 143
16.5 Mechanism of Anticancer Action 143
References 145
Chapter 17
Anti-inflammatory Activity of Aqueous-Ethanolic Extract of
Aerial Parts of Artemisia vulgaris Linn. in
Spargue Dawley Rats 147
17.1 Introduction 147
17.2 Materials and Methods 148
17.2.1 Plant Materials 148
17.2.2 Preparation of the Extract 148
17.2.3 Drug and Chemicals 148
17.2.4 Anti-inflammatory Activity 148
17.3 Results and Discussion 149
17.4 Conclusion 151
References 151
Chapter 18
Pharmacological Update of Anthraquinones 153
18.1 Introduction 153
18.2 Pharmacological Activities 155
18.2.1 Anticancer Activity 155
18.2.2 Antimicrobial Effect 157
18.2.3 Antihypertensive Activity (ACE Inhibitor Activity) 159
xvi Herbal Drugs as Therapeutic Agents
Chapter 19
Evaluation of Novel Strategies for the Treatment of
Aluminum-Induced Dementia in an Experimental Model 164
19.1 Introduction 164
19.2 Materials and Methods 165
19.2.1 Experimental Animals 165
19.2.2 Drugs and Chemicals 166
19.2.3 Aluminum-Induced Dementia Model 166
19.2.4 Experimental Model of Spatial Learning and Memory 166
19.3 Results 169
19.3.1 Aluminum Model of Dementia 169
19.3.2 Learning and Memory in Morris Water Maze Paradigm 171
19.3.3 Elevated Plus Maze 175
19.4 Discussion 177
19.4.1 Neurobehavioral Effects of Aluminum Chloride 178
19.4.2 Al Model of Dementia 178
19.4.3 Cholinesterase Inhibitors and Dementia
(Positive Control Group) 179
19.5 Conclusions 182
References 183
Chapter 20
Acne and Natural Products 186
20.1 Introduction 186
20.2 Dietary and Lifestyle Factors 186
20.3 Nutritional Supplements and Phytochemicals 187
20.4 Biochemical Therapies 188
20.5 Ayurvedic Herbs 189
20.6 Traditional Chinese Medicine/Acupuncture 189
20.7 Other Therapies 189
20.7.1 Light Therapy 189
20.8 Conclusion 190
References 190
Chapter 21
Composite Ayurvedic Formulations 193
Triphala 193
21.1 Introduction 193
Contents xvii
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