Diabetes mellitus is defined as a state in which homeostasis of carbohydrate and lipid metabolism is improperly regulated by insulin. This results primarily in elevated fasting and postprandial blood glucose levels. If this imbalanced homeostasis dose not returns to normalcy and continues for a protracted period of time, it leads to hyperglycemia, which in due course turns into a syndrome called diabetes mellitus. Several animal models have been developed for studying diabetes mellitus or testing anti-diabetic agents. These models include chemical, surgical (pancreatectomy) and genetic manipulations in several animal species to induce diabetes mellitus. The diabetogenic drugs used include: Alloxan monohydrate, Streptozotocin with or without nicotinamide, Ferric nitrilotriacetate, Ditizona and Anti-insulin serum. The selection of these models to use for investigating the antidiabetic properties of a new compound may be a very difficult task especially for young researchers. The aim of the present review is give a brief idea about various experimental models developed for studying diabetes mellitus, assess the merits and demerits of each model and highlight the precautions needed to avoid erroneous results during the applications of these models. Keywords: Diabetes Mellitus, Animal models, Alloxan, Streptozotocin.
Polycystic Ovary Syndrome (PCOS) is the most common, yet complex, endocrine disorder affecting women in their reproductive years and is a leading cause of infertility. This disease appears to be multifactorial and polygenic in nature involving multisystem dysfunction, namely reproduction, endocrine and metabolic. Hyperandrogenism and insulin resistance appear to be central cause to the pathophysiology of the disease. The glucose and insulin metabolism pathways have been studied and debated to understand whether Insulin Resistance is due to a defect in insulin action or a primary defect in β-cell function or decreased hepatic clearance of insulin, or a combination of all these factors. Numerous studies have demonstrated that obese, normal weight and thin women with PCOS have a form of insulin resistance that is unique and intrinsic to the disorder. Moreover obese women with PCOS possess an additional burden of insulin resistance resulting from their excess adiposity. Hyperinsulinemia leads to increase in androgen production directly by acting as a co-gonadotropin, augmenting Luteinizing Hormone activity within the ovary, and indirectly by increasing serum LH pulse amplitude. Whereas Androgens may in turn contribute at least partially to the insulin resistance state linked with PCOS. In this review, we will briefly study the role of insulin resistance in polycystic ovary syndrome. Keywords: Polycystic ovary syndrome, insulin resistance, Hyperandrogenism.
Diabetes is a chronic endocrine disease with global prevalence and increasing incidence. Diabetes presents with a major health issue in all age groups in the present times owing to its multisystem involvement and serious complications. In spite of drug development and therapeutic interventions, successful treatment of diabetes still remains a challenge and worldwide research is focused on finding alternative modalities. By conducting sizable amount of analytical work, numerous traditional medicines have been found for diabetes. Substances and extracts isolated from completely different natural resources particularly plants have perpetually been a fashionable arsenal for dominant and treating polygenic disorders downside and complication arising because of it. Many medicinal plants have shown promising effects in experimental animals which can be extrapolated to humans also. In this paper, we will review various medicinal plants showing anti-diabetic activity in experimental animals.
Nigella sativa L. (Family: Ranunculaceae; commonly known as black cumin) is an annual herb. N. sativa is cultivated and distributed all over India, especially in Punjab, Himachal Pradesh, Gangetic plains, Bihar, Bengal, Assam and Maharashtra. Among the traditional remedies, prescriptions of Nigella sativa for the treatment of various diseases are well-known since the prehistoric era. Therapeutic effects of Nigella sativa are thought to be due to nigellone and thymoquinone contents. The reported pharmacological properties include protection against disease and chemical-induced renal and hepatic toxicity, anti-inflammatory, analgesic, antipyretic, anti-microbial and antineoplastic activities. The oil decreases blood pressure, cholesterol, triglycerides, and glucose and increases respiration, hemoglobin and packed cell volume. In the traditional system of medicine, black cumin seeds are effective against cough, bronchitis, asthma, chronic headache, migraine, dizziness, chest congestion, dysmenorrheal, obesity, diabetes, paralysis, hemiplegia, back pain, infection, inflammation, rheumatism, hypertension and gastrointestinal problems such as dyspepsia, flatulence, dysentery, and diarrhea. In this review, we will elaborate about this wonder herb having miraculous effects.
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