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Estrogen deficiency is associated with aging and increases the incidence of metabolic syndrome and hypertension. In this study, the effects of tibolone, a synthetic steroid, on the cardiovascular system, liver lipid metabolism, and redox status were evaluated, in ovariectomized (OVX) rats with renovascular hypertension (two-kidneys, one-clip, OVX + 2K1C). This study encompassed direct measurements of mean arterial pressure , plasma biochemical analysis, liver lipid contents, and assessments of the mitochondrial and peroxisomal β-oxidation capacities. Additionally, the liver redox status was assayed. Tibolone significantly reduced the mean arterial pressure of OVX + 2K1C rats, albeit reducing total and high-density lipoprotein (HDL) cholesterol levels. In the liver, although exerting an undesirable inhibition of mitochondrial and peroxisomal β-oxidation, tibolone reversed steatosis. Tibolone also improved the liver redox status: the reduced glutathione contents and the activity of glucose-6-phosphate dehydrogenase were restored by this compound, which also reduced the levels of thiobarbituric acid-reactive substances and the generation of mitochondrial reactive oxygen species. So, tibolone reversed the main alterations caused by hypertension and estrogen deficiency.

Beneficial Effects of Tibolone on Blood Pressure and Liver Redox Status in Ovariectomized Rats With Renovascular Hypertension