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Abstract Title:

Antidiabetic activity of watermelon () juice in alloxan-induced diabetic rats.

Abstract Source:

J Diabetes Metab Disord. 2020 Jun ;19(1):343-352. Epub 2020 Apr 28. PMID: 32550185

Abstract Author(s):

Basiru Olaitan Ajiboye, Moturayo Tawakalt Shonibare, Babatunji Emmanuel Oyinloye

Article Affiliation:

Basiru Olaitan Ajiboye

Abstract:

Introduction: Watermelon is one of the commonly eaten fruit in most homes in Nigeria and has been used in the management of diabetes mellitus traditionally. This study was carried out to explore the antidiabetic potential of watermelon () juice in alloxan-induced diabetic rats.

Methods: Watermelon juice was used for the determination of in vitro parameters such as 1,1-diphenyl-2-picryl-hydrazil (DPPH), nitric oxide and ferric reducing antioxidant potential (FRAP) as well as phytochemicals such as total phenol, total flavonoids. In vitroα-glucosidase and α-amylase inhibitory activities were also accessed using standard procedures. Diabetes was induced in the rats by a single intraperitoneal (I.P) injection of freshly prepared alloxan (150 mg/kg body weight). The animals were randomly grouped into five groups of normal control, untreated diabetic control, diabetic rats administered 200 mg/kg body weight of metformin, diabetic rats administered 500 mg/kg body weight of watermelon () juice and diabetic rats administered 1000 mg/kg body weight of watermelon juice. The rats were sacrificed on the 14th day of the experiment and various in vivo biochemical parameters were also evaluated in the serum and tissue homogenates of diabetic rats.

Results: The watermelon juice exhibits anti-oxidant properties and inhibitory activities againstα-glucosidase and α-amylase in a dose-dependent manner. Added to this, the administration of different doses of the watermelon juice significantly ( < 0.05) reduced the fasting blood glucose level, serum lipid profile, glucose-6-phosphatase, lipid peroxidation and anti-inflammatory activities in alloxan-induced diabetic rats. There was a significant ( < 0.05) increase in antioxidant enzyme activities, hexokinase activity as well as glucose transporters (GLUT 2 and GLUT 4) levels in diabetic rats administered different doses of

Conclusion: Taken together, this study demonstrates that watermelon () juice exhibits its antidiabetic potential in experimental diabetic animal model via multiple pathways involving modulation of glucose transporters, anti-inflammatory activities as well as antioxidant defense system and inhibition ofα-glucosidase and α-amylase. This suggests that the watermelon (juice may have a useful clinical application in the management of diabetes mellitus and its metabolic complications if developed as adjuvant therapy.

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Sayer Ji
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