The Possible Protective Effect of Resveratrol on Naphthalene Induced Nephrotoxicity in Adult Male Albino Rat

Abstract

Abstract Background Resveratrol, a natural polyphenolic compound that is extensively stemmed from grapes, berries, red wine, and peanut skins, is reported with its pharmacological activities against numerous cardiovascular and renal diseases, inflammation, anti-oxidation and cancers. Naphthalene (NA) is a common environmental hazardous contaminant and is abundant in tobacco smoking, in addition to various exposures. Aim of Work the aim of the present work was to study the possible protective effect of Resveratrol on Naphthalene induced nephrotoxicity in adult male albino rat. Materials and Methods 36 Adult male albino rats were assigned randomly into three groups; control group, it was further subdivided into four subgroups (IA received no treatment, IB received Resveratrol 10 mg/kg/day, IC received corn oil 5 mg/kg/day and ID received Propylene glycol), NA group (rats received 200 mg/kg of NA dissolved in 5 ml/kg corn oil daily for four weeks, orally), and Resveratrol protected group (rats received Resveratrol dissolved in propylene glycol at a dose 10 mg/kg followed after 60 min with Naphthalene at a dose 200 mg/kg dissolved in 5 ml/kg corn oil daily for four weeks). At the end of experiment (30 days), rats were euthanized, and kidney specimens were processed into paraffin blocks for light microscopic examination. Morphometric study and statistical analysis were done. Results The present work demonstrated that NA induced several histopathological changes of the kidneys in terms of cortex and medulla. Distorted renal capsule, thickened glomerular basement membrane, scattered small-sized and hypercellular glomeruli with apoptotic cells and narrow Bowman’s spaces. Proximal tubules and the distal tubules showed markedly apoptotic epithelial lining with pyknotic nuclei, partial loss of brush borders, vacuolations and intra-tubular hyaline casts. Congested interstitial blood vessels, peri-vascular edema, massive inflammatory infiltrate and dense collagen distribution. Renal medulla showed collecting tubules with apoptotic epithelial lining with pyknotic nuclei and intratubular hyaline casts. Findings were demonstrated by histomorphometry. Resveratrol protected group showed histopathological findings significantly reduced compared with NA group. Reduced number of scattered small-sized glomeruli with less thickened glomerular basement membrane. The proximal tubules and distal tubules appeared with less apoptotic epithelial lining, fewer pyknotic nuclei and preserved brush borders and interstitium with fair collagen deposition. The medullary regions showed collecting tubules with mostly normal epithelial lining and reduced inflammatory infiltrate. Conclusion The present study demonstrated the deleterious effects of NA on the structure of the kidney. It also suggested the protective role of Resveratrol against the nephrotoxicity.