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Chronic stress and high sucrose intake cause distinctive morphometric effects in the adrenal glands of post-weaned rats.
Biotechnic & Histochemistry : Official Publication of the Biological Stain Commission 2018 August 24
We investigated the effects of chronic stress combined with high sucrose intake on the morphology of the adrenal glands in young rats. Male Wistar rats were fed a standard chow diet and allocated into control (C; tap water), chronic restraint stress (St), 30% sucrose diet (S30) and 30% sucrose diet + chronic restraint stress (S30 + St) groups. St consisted of 1 h daily sessions, 5 days/week for 4 weeks. Chronic stress reduced the thickness of the zona glomerulosa (ZG) and zona fasciculata (ZF) in both right and left glands; the thickness of the zona reticularis (ZR) was increased in the right gland. Cell density was greater in the ZF and medulla of both right and left glands, whereas cell density increased in the ZR of only the left gland. The percentage of small cells was lower in the ZG, whereas more large cells were found in the left gland. A similar result was obtained for the ZF, ZR and medulla in both right and left glands. Chronic stress increased the area covered by blood vessels in the ZR of the right gland, but decreased the area in the ZR of the left gland. The area covered by blood vessels was reduced in the medulla of both right and left glands in rats subjected to chronic stress. Infiltration of immune cells was increased by chronic stress in all layers of the cortex of the left gland, but was reduced in the medulla of the right gland. A high sucrose diet reduced the thickness of the medulla in the left gland. Cell proliferation increased in the ZG of the right gland and the weight of the right adrenal gland increased. Reduced cell proliferation in the ZG of the left gland was associated with a reduction in the area covered by blood vessels. In addition, the area covered by blood vessels decreased in the medulla of both glands. Our findings demonstrate that exposure to chronic stress during early life causes morphometric changes in adrenal glands.
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