Nihms 603359
Nihms 603359
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                               Diabetes Metab Res Rev. Author manuscript; available in PMC 2014 July 27.
                           Published in final edited form as:
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                           Summary
                                 Since the advent of glucocorticoid therapy for autoimmune disease in the 1940s, their widespread
                                 application has led to the concurrent therapy-limiting discovery of many adverse metabolic side
                                 effects. Unanticipated hyperglycemia associated with the initiation of glucocorticoids often leads
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                                 to preventable hospital admissions, prolonged hospital stays, increased risks for infection and
                                 reduced graft function in solid organ transplant recipients. Challenges in managing steroid-
                                 induced diabetes stem from wide fluctuations in post-prandial hyperglycemia and the lack of
                                 clearly defined treatment protocols. The mainstay of treatment is insulin therapy coincident with
                                 meals.
                                 This article aims to review the pathogenesis, risk factors, diagnosis and treatment principles
                                 unique to steroid-induced diabetes.
                           Keywords
                                 steroid-induced diabetes; glucocorticoids; insulin resistance; new onset diabetes after transplant
                           Introduction
                                            Glucocorticoids are extensively used in almost every subspecialty of medicine. Indications
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                                            for short-term acute steroid therapy can be seen in exacerbation of chronic obstructive
                                            pulmonary disease, acute gout, chemotherapy protocols, bacterial meningitis and in pregnant
                                            women for fetal lung maturation, to name a few. Disease processes benefiting from chronic
                                            glucocorticoid use include the following: pulmonary diseases such as idiopathic interstitial
                                            pneumonia, hypersensitivity pneumonitis and sarcoidosis; autoimmune conditions;
                                            neurologic diseases such as myasthenia gravis and multiple sclerosis; and inflammatory
                                            bowel diseases. More recently, chronic glucocorticoid therapy plays an important role in
                                            modulating the immune system following solid organ transplantation. Although widely
                                            prescribed for their anti-inflammatory and immunosuppressive properties, glucocorticoids
                                             have various common metabolic side effects including hypertension, osteoporosis and
                                             diabetes. Steroid-induced diabetes mellitus (SIDM) has been recognized as a complication
                                             of glucocorticoid use for over 50 years [1].
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                              Definition
                                             Steroid-induced diabetes mellitus is defined as an abnormal increase in blood glucose
                                             associated with the use of glucocorticoids in a patient with or without a prior history of
                                             diabetes mellitus. The criteria for diagnosing diabetes by the American Diabetes Association
                                             [2] is an 8 h fasting blood glucose ≥ 7.0 mmol/L (126 mg/dL), 2 h post 75 g oral glucose
                                             tolerance test (OGTT) ≥ 11.1 mmol/L (200 mg/dL), HbA1c ≥ 6.5% or in patients with
                                             symptoms of hyperglycemic, a random plasma glucose of ≥ 11.1 mmol/L (200 mg/dL).
                              Prevalence
                                             Given the widespread use of glucocorticoids in both the inpatient and ambulatory care
                                             setting, it is not surprising that at our 550-bed teaching hospital, approximately 40% of all
                                             inpatient consults to the Endocrinology Consult Service are for new onset steroid-induced
                                             diabetes or type 2 diabetes exacerbated by steroid use. This figure is consistent with the rate
                                             of 56% noted at other institutions [3].
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                                             The length of time on steroids, the relative potency of the glucocorticoid and the absolute
                                             dose all play a role in the occurrence of SIDM. In a retrospective study of 11 855 patients
                                             receiving various doses of glucocorticoids, Gurwitz et al. assessed the need of hypoglycemic
                                             therapy. The calculated odds ratio for patients receiving the equivalent of 50, 100 and
                                             greater than 120 mg of hydrocortisone daily were 3.02, 5.82 and 10.35, respectively,
                                             compared with controls [4]. In order to appreciate the magnitude of SIDM, one needs to
                                             consider that steroids cause predominantly post-prandial hyperglycemia and therefore,
                                             looking at impaired fasting glucose as the sole criteria, may underestimate the true incidence
                                             of SIDM.
                                             Varying immunosuppression protocols have caused discrepant incidence rates, although all
                                             agree that the incidence of NODAT is high in renal, liver, heart and lung transplant
                                             recipients (Table 1) [7–10]. In addition, the presence of NODAT has an adverse outcome on
                                             the survival of the transplanted organ as well as the health of the recipient [10].
                                             The population of patients following solid organ transplant is not the only population treated
                                             with glucocorticoids who develop SIDM: 12.7% of lupus patients [11], 14.7% of patients
                                             with respiratory ailments [10] and 23.5% of leprosy patients [12] developed diabetes
                                             following treatment with glucocorticoids. In addition, endogenous overproduction of
                                             glucocorticoids resulting in Cushing's syndrome often translates to central obesity, muscle
                                             wasting, hepatic steatosis, hypertension and insulin resistance. In either overt or ‘subclinical’
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                           Hwang and Weiss                                                                                              Page 3
                                             Cushing's 53% and 45% of subjects had either frank diabetes or impaired glucose tolerance,
                                             respectively [13].
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                              Pathophysiology
                                             The effect of glucocorticoids on glucose metabolism is likely the result of impairment of
                                             multiple pathways including beta cell dysfunction (sensitivity to glucose and ability to
                                             release insulin) and insulin resistance in other tissue.
                              Clinical studies
                                             The role of beta cell function and other tissues' sensitivity to insulin may be different
                                             depending on whether the glucocorticoid effect is acute or chronic. One study compared an
                                             acute single dose of prednisolone (75 mg) with 30 mg of prednisolone daily for 15 days. The
                                             acute treatment inhibited several parameters of beta cell function. Conversely, prolonged
                                             glucocorticoid exposure showed partial recovery of beta cell function but similarly impaired
                                             glucose tolerance, suggesting additional factors are important in SIDM other than beta cell
                                             dysfunction [14].
                              In vitro studies
                                             Further evidence for a direct effect of glucocorticoids on beta cell function has been from
                                             cultured rat insulinoma insulin-secreting, INS-1E cells [17]. Measurement of impaired
                                             insulin release in response to a glucose challenge was seen in prednisone-treated INS-1E
                                             cells. The inhibition was reversed in the presence of prednisone with the glucocorticoid
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                                             receptor antagonist, RU486 [17]. The authors suggest that the defect may be due to impaired
                                             endoplasmic reticulum homeostasis, which in turn may lead to beta cell death.
                              Glyceroneogenesis
                                             One of the etiologies of SIDM is based on the profound and reciprocal effect glucocorticoids
                                             have on glyceroneogenesis in liver and adipose tissue (Figure 1). In adipose tissue,
                                             glyceroneogenesis controls the rate of fatty acid release in the blood, while in the liver
                                             glyceroneogenesis is responsible for the synthesis of triacylglyerol from fatty acids and
                                             glycerol 3-phosphate [18]. The regulation of this process in both liver and adipose is via the
                                             enzyme phosphoenylpyruvate carboxykinase (PEPCK). In the presence of glucocorticoids,
                                             PEPCK gene expression in adipose tissue is suppressed, inhibiting glyceroneogenesis. In
                                             contrast, PEPCK in liver stimulates glycerol production and fatty acid concentration in the
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                                             blood increased by the action of lipoprotein lipase [19]. The net result of glucocorticoids,
                                             therefore, is to increase the amount of fatty acids released into the blood. An increase in
                                             fatty acids interferes with glucose utilization and results in insulin resistance, especially in
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                                             Proposed risk factors for steroid-induced diabetes beyond cumulative dose and longer
                                             duration of steroid course include traditional risk factors for type 2 diabetes: older age,
                                             family history, high body mass index and impaired glucose tolerance [23]. The association
                                             with family history of diabetes is not well defined. Simmons et al. compared the
                                             demographics and clinical characteristics of patients with new onset SIDM with those with
                                             type 2 diabetes with and without steroid treatment. Those individuals who developed new
                                             onset SIDM had significantly less family history of diabetes when compared with
                                             individuals with type 2 diabetes mellitus and glucocorticoid treatment [24].
                              Concurrent immunosuppression
                                             Other immunosuppressive agents can also affect glycemic control through other
                                             mechanisms, thus confounding impact of glucocorticoid therapy. In transplant patients, the
                                             use of calcineurin inhibitors (particularly tacrolimus) contributes to glucose intolerance by
                                             suppressing insulin production [24]. In those patients with systemic lupus erythematosis,
                                             patients on high-dose steroid therapy, development of diabetes was associated with
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                              Hypomagnesemia
                                             Numerous studies have reported an inverse relationship between glycemic control and serum
                                             magnesium levels. Van Laecke et al. conducted a single-centre retrospective analysis
                                             consisting of 254 renal transplant recipients demonstrating that hypomagnesemia during the
                                             first month post-transplant was associated with the development of NODAT [26].
                              Hepatitis C virus
                                             Liver disease contributes to impaired glucose tolerance, but there is evidence that chronic
                                             hepatitis C virus (HCV) infection itself is an independent risk factor for the development of
                                              Diabetes Metab Res Rev. Author manuscript; available in PMC 2014 July 27.
                           Hwang and Weiss                                                                                              Page 5
                                             diabetes in the general population and in liver transplant recipients [27,28]. A meta-analysis
                                             by Fabrizi et al. associated HCV seropositivity with a significantly increased risk of
                                             NODAT in kidney transplantation [29]. Baid et al. also demonstrated that the prevalence of
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                                             NODAT was significantly higher in HCV positive patients (64% versus 28%) who
                                             underwent liver transplant [27].
                              Clinical course
                                             The tendency for patients to develop new hyperglycemia in the setting of initiating
                                             glucocorticoid therapy is often not anticipated. In the elderly, without close follow-up or
                                             monitoring of blood sugars, there is a risk of precipitating hyperglycemic hyperosmolar
                                             states [30], which would require admission to the hospital for aggressive hydration and
                                             insulin therapy. It is generally thought that glucocorticoids result mainly in an increase in
                                             post-prandial blood glucose [31,32]. Use of continuous blood glucose monitor in COPD
                                             patients treated with prednisolone demonstrated that hyperglycemia predominately occurs in
                                             the afternoon and evening, indicating that this would be the most appropriate time to screen
                                             for SIDM as well as the period of time to direct specific treatment [33].
                              Early detection
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                                             Strategies are needed to detect those at risk for developing steroid-induced diabetes before
                                             starting chronic therapy. The 2004 updated international consensus guidelines for NODAT
                                             suggest that pre-transplant evaluation include fasting plasma glucose, and when this is
                                             normal, an OGTT [22]. When OGTTs were performed in a cohort of renal transplant
                                             patients 1 week before and approximately 1 year after transplant, 23.7% of the patients had
                                             NODAT, which was associated with higher fasting and 2 h plasma glucose in the pre-
                                             transplant setting. Additionally, the ratio of proinsulin to insulin was higher at baseline in
                                             the patients that developed NODAT group [34].
                              Comorbidities
                                             New onset diabetes after transplant is a strong predictor of graft failure in the transplant
                                             population. Roth et al. reported 12-year graft survival in diabetic patients to be 48% versus
                                             70% in controls [33]. Graft failure in the renal transplant population who develop NODAT
                                             is attributed to ongoing hyperglycemia leading to recurrent diabetic nephropathy [36].
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                                             Diabetes is also associated with increased risk of cardiovascular events and a myriad of
                                             microvascular complications. The literature suggests that kidney transplant recipients who
                                             develop NODAT are at a twofold–threefold increased risk of fatal and non-fatal
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                              Treatment
                                             Optimal treatment of SIDM warrants a different management strategy than non-steroid-
                                             induced diabetes. For instance, metformin, which is often used first-line in type 2 diabetes,
                                             is not recommended for SIDM because of its many relative or absolute contraindications,
                                             which include nausea/vomiting, hypoxia and liver or kidney disease. As noted previously in
                                             the discussion about glyceroneogenesis, the role of thiazolidinediones is yet to be fully
                                             explored.
                              Non-pharmacologic intervention
                                             As with all types of diabetes, initial steps to improve glycemic control include lifestyle
                                             modification which includes exercise and dietary counselling to provide options that can
                                             perhaps lessen post-prandial hyperglycemia.
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                              Insulin
                                             Because initiation of glucocorticoids can cause post-prandial hyperglycemia and the
                                             tapering of glucocorticoids can lead to normalization of glycemic control, current guidelines
                                             may insufficiently address this. Basal bolus insulin therapy remains the most flexible option
                                             for patients and includes three components: basal insulin, prandial insulin and a
                                             supplemental correction factor insulin [38]. Conventional use of long-acting basal insulin
                                             with traditional weight-based dosing may cause nocturnal hypoglycemia [33]. More studies
                                             exploring dose titration of insulin in patients on glucocorticoids possibly utilizing
                                             technology like continuous glucose monitoring system are needed. In general, however,
                                             timing of glucocorticoids, to a midday or an evening meal with concomitant administration
                                             of intermediate acting insulin, is judicious.
                              Secretagogues
                                             Oral secretagogues such as sulfonylurea therapy do not specifically target post-prandial
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                                             hyperglycemia and thus long-acting agents may be associated with hypoglycemia if the
                                             patient does not eat meals regularly. For patients with mild hyperglycemia who are unable or
                                             unwilling to give injections of insulin, a trial of short-acting secretagogues such as
                                             nateglinide or repaglinide taken before meals could be considered [38].
                              Incretin mimetics
                                             Incretin-based therapy with GLP-1 receptor agonists and DPP-4 inhibitors control glucose
                                             levels by stimulating insulin and inhibiting glucagon secretion in the fasting and post-
                                             prandial setting. A single dose of exenatide was able to improve glucose intolerance and
                                             insulin resistance in mice [39]. In humans, a randomized, double-blind, placebo-controlled
                                             trial was performed in which subjects on prednisone therapy received either the GLP-1
                                             receptor agonist exenatide or saline [40]. Exenatide prevented prednisone-induced glucose
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                           Hwang and Weiss                                                                                                    Page 7
                                             intolerance and islet cell dysfunction primarily by decreasing glucagon and decreasing
                                             gastric emptying (Table 2) [40]. In the post-transplant setting, as more studies will be
                                             conducted with these and other agents, attention to drug–drug interactions is essential.
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                              Conclusion
                                             As the therapeutic benefits of glucocorticoids continue to expand across medical specialties,
                                             the incidence of steroid-induced or steroid-exacerbated diabetes will continue to rise.
                                             Similar to non-steroid-related diabetes, the principles of early detection and risk factor
                                             modification apply. Diagnosing impaired fasting glucose or impaired glucose tolerance prior
                                             to the initiation of chronic glucocorticoids will better identify those who would benefit from
                                             steroid-sparing treatment, or if this is not an option, blood glucose monitoring while starting
                                             therapy. Further investigation into the precise mechanism of steroid-induced insulin
                                             resistance will provide insight into future diabetes prevention efforts and targeted therapies.
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                                             Figure 1.
                                             The effect of glucocorticoids on glycerneogenesis in adipose tissue and liver.
                                             Phosphoenylpyruvate carboxykinase (PEPCK) is reciprocally upregulated in liver and
                                             downregulated in adipose by glucocorticoids. This results in a buildup of free fatty acids in
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                                             the blood, which in turn result in insulin resistance and increase gluconeogenesis
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                           Hwang and Weiss                                                                                                Page 11
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                                             Figure 2. Molecular basis of glucocorticoid (GC) action. See text for details. After van Raalte et
                                             al. [21]
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                                                                                             Table 1
                                              Examples of incidence of steroid-induced diabetes following solid organ transplantation
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                                                                                          Table 2
                                             Effect of prednisolone with and without exenatide following a mixed meal [40]
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Diabetes Metab Res Rev. Author manuscript; available in PMC 2014 July 27.