Attenuation of Alloxan-induced Low-grade Inflammation by Persea Americana Polyphenolic Peel Extract in Male Wistar Rats

Abstract

Background: Based on the conceived causal relationship that exist between oxidative stress, hyperglycemia and low‐grade inflammation, this study was hypothesized to evaluate how treatment with polyphenolic peel extract of avocado pear (APPE), with established antioxidant activity, may be deployed in the management of complications arising from diabetes. Methods: Twenty adult male alloxan-induced diabetic Wistar rats randomly assigned to five groups (n = 5) designated: diabetic control (DC), treated with distilled water; and 25, 50, 100 and 200 mg/kg APPE, respectively. A sixth group comprising of five normal rats administered distilled water served as normal control (NC). Results: Following a 21-day single daily oral administration of APPE, remarkable improvements in body weight and blood glucose concentration were noted in diabetic rats especially at 200 mg/kg compared to DC. A dose-related significant reductions in glycated hemoglobin, interleukins (1β and 6), tumour necrosis factor-α (TNF-α) levels in diabetic rats treated with APPE compared to DC. Conversely, serum insulin and interleukin-10 concentrations were significantly elevated in a dose-related fashion in APPE administered diabetic rats compared to DC. Unlike the intestine and heart which were spared severe morphological treatment due to alloxan intoxication, diabetic control rat and those on low dose of the extract showed varying degree of interface hepatitis and glomerulosclerosis. However, diabetic rats on 200 mg/kg APPE were protected from the damaging effects of diabetes mellitus on the liver and kidney.Conclusion: APPE abrogated the oxidative stress-induced hepatic and nephrotic damage in diabetic rats.