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Effect of growth hromone and estrogen administration on hepatocyte alterations in old ovariectomized female wistar rats

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Abstract

Aging could be due to the accumulation of oxidative damage. On the other hand, growth hormone (GH) and estrogen deficiency induce deleterious effects on different tissues, and hormonal replacement could counteract these effects. We have investigated whether GH and estrogen administration modify some parameters related to oxidative stress and inflammation in hepatocytes isolated from old ovariectomized female rats. Twenty-two month-old ovariectomized animals were divided into control rats, rats treated with GH, rats treated with estradiol, and rats treated with GH+estradiol. Two-month-old intact female rats were used as young reference group. Hepatocytes were isolated, cultured, and CO and NO release, ATP, cyclic-guanosyl monophosphate (cGMP), and lipid peroxide (LPO) content of cells, as well as phosphatidylcholine (PC) synthesis, were measured. Hepatocytes isolated from old ovariectomized rats showed a decrease in ATP content and PC synthesis compared to young rats. Age also induced an increase in LPO, NO, CO, and cGMP. Treating old rats with GH significantly increased ATP and reduced CO and cGMP levels. Estradiol administration improved all the parameters that were altered. Co-administration of GH and estrogens induced a more marked effect than estrogens alone only in cGMP content. In conclusion, administration of estrogens to old ovariectomized females seemed to prevent oxidative changes in hepatocytes, whereas the effect of GH is not so evident.

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Castillo, C., Salazar, V., Ariznavarreta, C. et al. Effect of growth hromone and estrogen administration on hepatocyte alterations in old ovariectomized female wistar rats. Endocr 26, 11–18 (2005). https://doi.org/10.1385/ENDO:26:1:011

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