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Treatment of Diabetis Type 2: Classical Oral Antihyperglycaemic Agents

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1. INTRODUCTION
Although, classical oral antihyperglycaemic agents are the mainstay treatment of type 2 diabetes, they fail to prevent diabetic complications (Bergenstal, Bailey, & Kendall, 2010). This, therefore, justifies the search for more efficacious drugs. Although modern medicine has provided drugs belonging to classes including thiazolidinediones, GLP-1 mimetics and DPP-IV inhibitors (Krentz, Patel, & Bailey, 2008), there is still a need for new agents with better potential and physiological antidiabetic actions for the treatment of diabetes. Therapeutic potential of phytochemicals in the management of many human diseases, including diabetes, have been widely acknowledged. However, scientific studies assessing the potentially …show more content…

Finally, in a randomized, placebo-controlled, clinical trial, leaf extract of O. sanctum caused a significant decrease in fasting and post-prandial glucose (Agrawal, Rai, & Singh, 1996). These observations plus the evidence that compounds isolated from ethanol extracts of O. sanctum exert antioxidant effects (Kelm, Nair, Strasburg, & DeWitt, 2000), illustrate the value of further studies to elucidate the antidiabetic actions of this plant.
We have reported that extracts of leaves of O. sanctum enhance insulin secretion in isolated perfused pancreas, isolated islets and clonal insulin secreting cells (Hannan et al, 2006a). In the present study, we have investigated other possible mechanisms by which O. sanctum leaf extracts ameliorate hyperglycaemia using animal and cellular models of diabetes.

2. MATERIALS AND METHODS
2.1. Plant material preparation
O. sanctum leaves were obtained from Ramkrishna Mission, India and voucher specimens were deposited in the National Herbarium, Bangladesh after botanical authentication. Leaves were dried at room temperature and pulverized prior to extraction of powdered samples (2 kg) with ethanol (80%, 10 l) for approximately 4 days at room temperature. The extraction solvent was changed daily and the combined extract was filtered, evaporated to dryness using a rotary evaporator and freeze dried

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