Activities and Androgenic Regulation of KREB Cycle Enzymes in the Epididymis and VAS Deferens of Rhesus Monkey

The activities of nine enzymes of the TCA cycle were estimated in the initial segment, caput, corpus and cauda segments of epididymis and vas deferens of adult rhesus monkey and expressed as units per mg DNA. These enzymes were also estimated in epididymal segments and vas deferens of castrated and castrated-androgen replaced monkeys as well. Results indicated higher activities of most of the enzymes in vas deferens as compared to epididymal segments. All the enzymes showed marked reduction in epididymis and vas deferens after castration, the effect being much more pronounced in the epididymis, than in the vas. Androgen replacement in castrated monkeys stimulated most of the enzymes markedly in epididymis and in the vas deferens as compared to their castrated values. The response of cauda and vas deferens to exogenous androgen treatment was however moderate, as compared to the other epididymal segments. The studies indicate that energy metabolism in the epididymis (as well as in the vas deferens) is strictly androgen dependent and the energy charge of these target organs is likely to fall appreciably after castration, which may in turn affect many energy dependent processes of these organs (e.g. absorption, secretion of specific substances etc.) which have been considered important for sperm maturation and survival.