Background Modern society is full of stress. Immobilization stress is a model used in animals to study its effects. Vitamin E is an antioxidant that protects biological membranes from oxidative stress. Objectives This study aimed to investigate the effects of immobilization stress on the adrenal cortex of rats and the ameliorative effect of vitamin E. Material and methods Forty adult male rats were used in this study and were divided equally into 4 groups. Group I: were divided equally into negative and positive controls. Group II: rats received vitamin E at a dose of 40 I.U/kg by gastric tube for 30 days. Group III: rats subjected to immobilization stress 2 hours /day for 30 days. Group IV: rats subjected to immobilization stress 2 hours /day and received 40 I.U/kg of vitamin E for 30 days. Adrenal sections were histologically prepared and examined. Results Group II was comparable to group IA. Group III revealed zona glomerulosa (ZG) with loss of normal architecture, zona fasciculata (ZF) with multiple cells containing cytoplasmic vacuolations and darkly stained nuclei. By EM ZG cells appeared with accumulations of lipid droplets and lysosomes, irregular nuclear envelopes and chromatin condensation. ZF cells showed numerous lipid droplets and irregular nuclear envelopes. There were significant increases in the mean area of collagen fibers and mean serum cortisol level. Group IV revealed regression of these changes and increase in the mean count of CD44 +ve cells. Conclusion Immobilization stress exerted deleterious suprarenal cortical changes and vitamin E had an ameliorative effect. Key words: Adrenal cortex, Suprarenal gland, Immobilization stress, Vitamin E. |
