Influence of corticosterone acetate on the spleen in intact and ovariectomized rats.
Increasing evidence of the interaction of glucocorticoids and ovarian steroids prompted the current study. Effects of exogenously administered corticosterone acetate (3.5 mg/100 g b.w/day for one week) were examined on splenic nucleic acids, protein, lactate, and on lactate dehydrogenase (LDH) specific activity and its isozymes in ovariectomized and ovary-intact Wistar rats (65-75 days old). Ovariectomy resulted in no significant change in the parameters studied except DNA which increased significantly. The administration of corticosterone to these rats did not produce any remarkable change in the ovariectomy caused increase in splenic DNA content. Nevertheless, it decreased the ratio of heart type subunits (H)/muscle type subunits (M) [H/M] of LDH isozymes. In the case of ovary-intact rats, corticosterone produced an increase in the concentration of splenic lactate but a decrease in the H/M ratio. Exogenously administered corticosterone exerts selective synergistic interaction with ovarian hormones on splenic lactate. The specific activity of LDH and the concentrations of RNA and protein remained unchanged during the interaction between ovarian hormones and corticosterone.
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