[Regularities in androgen reception in rat liver and its role in realizing direct androgenous effects]

The content of androgen receptors (AR) in the cytosol and nuclear fractions of rat liver cells was studied by using the radioligand method. It was found that the nuclear AR content depends on the sex of animals as well as on the initial level of AR in the cytosol fraction. Elevation of AR concentration (p less than 0.05) in liver nuclei of different groups of animals was noted one hour after injection of 100 micrograms of methyltrienolone (R-1881). This elevation correlated positively with the initial level of AR in the cytosol. The accumulation of AR in liver nuclei was more pronounced in intact males than in females. A direct positive correlation between the initial level of cytosol AR and the final regulatory effect of androgens on the hepatic AR content (r = 0.955, n = 6, p less than 0.02) and on the content of the hepatic unusual estrogen-binding protein (UEBP) (r = 0.957, n = 9, p less than 0.001) were found. It is concluded that androgens induce in liver nuclei the accumulation of AR whose level correlates with that of the initial cytosolic AR. The latter reflects the efficiency of the direct effect of androgens on liver cells.