The Effeets Of Castration Alpha-adrenergie Receptors And Calcium Channels in Rabbit Vas Deferens And Aorta

This in vitro investigation has been studied in the isolated vay defer-ens and thoracic aorta obtained fi-om castrated rahhits. The effects of castration on the response of yas deferens to the electrical stimulation and no-radrenalin administration and the changes on in-hibition of KCI induced contraction of thoracic aorta hy nifedipine have been investigated. Pre-parations obtained from control and castrated gro-ups suspended in 25 ml organ bath containing Krebs-Henseleit solution, which was maintained ar a constant temperature of 37°C and bubbled wiht a gas mixture containing 95% 02 and 5%CO2. Two different stimulations wer-e applied tü vas defeı-enses that are submaxirnal voltage. 0.1 Hz, 1 rns duration and submaximal voltage. 10 Hz. 0.5 ms duration. In addition, the inhihitory effect of nifedipine applied cumulative doses orr •ontraction induced 40 mM KC1 was examined. Contrary to the control group, in the castrated rahhit vas deferens no tvi• response ta the low frequency electrical stimulation was oh-served and NANC component of hiphasic response to the high frequency electrical was abolished. In the nonstimulated section of this study, tonic phase of the contraction response tü noradrenalin was aholished and spontaneous contractions occured. The maximum inhibitoıy effects of nijedipine and IC50 values were same for all groups. As a results. it has been concluded that adreneı-gic NANC nerves in rabbit yas deferens were sensitive to the tes-tosterone, however, no effect of' castration on the cakium channels was ohserved in rabbit thoı-acic aorra.