Abstract
Rebaudioside A (Reb A), a major constituent of Stevia rebaudiana, was recently proposed as an insulinotropic agent. The aim of this investigation was to evaluate the antihyperglycemic effect of Reb A on the activities of hepatic enzymes of carbohydrate metabolism in streptozotocin (STZ)-induced diabetic rats. Diabetes was induced in adult male Albino Wistar rats, weighing 180–200 g, by a single intraperitoneal injection at a dose of STZ (40 mg/kg body weight). Diabetic rats showed significant (P < 0.05) increase in the levels of plasma glucose and glycosylated hemoglobin and significant (P < 0.05) decrease in the levels of plasma insulin and hemoglobin. Activities of gluconeogenic enzymes such as glucose-6-phosphatase and fructose-1,6-bisphosphatase were significantly (P < 0.05) increased while hexokinase and glucose-6-phosphate dehydrogenase were significantly (P < 0.05) decreased in the liver along with glycogen. Oral treatment with Reb A to diabetic rats significantly (P < 0.05) decreased blood glucose and reversed these hepatic carbohydrate metabolizing enzymes in a significant manner. Histopathology changes of pancreas confirmed the protective effects of Reb A in diabetic rats. Thus, the results show that Reb A possesses an antihyperglycemic activity and provide evidence for its traditional usage in the control of diabetes.
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Abbreviations
- ATP:
-
Adenosine triphosphate
- DNA:
-
Deoxyribonucleic acid
- GLUT-2:
-
Glucose transporter-2
- Hb:
-
Hemoglobin
- HbA1c:
-
Glycosylated hemoglobin
- NAD:
-
Nicotinamide adenine dinucleotide
- NADPH:
-
Nicotinamide adenine dinucleotide phosphate
- Reb A:
-
Rebaudioside A
- STZ:
-
Streptozotocin
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Saravanan, R., Vengatash babu, K. & Ramachandran, V. Effect of Rebaudioside A, a diterpenoid on glucose homeostasis in STZ-induced diabetic rats. J Physiol Biochem 68, 421–431 (2012). https://doi.org/10.1007/s13105-012-0156-0
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DOI: https://doi.org/10.1007/s13105-012-0156-0