This investigation was undertaken to study the potassium and sodium concentrations in rete testis fluid and cauda epididymal plasma and spermatozoa following gossypol treatment. Rats were treated orally with gossypol acetic acid at a dose of 15 mg/ kg/day for 3 and 6 weeks respectively. There were not abnormal fmdings in the ionic concentrations of cauda epididymal plasma following 3 or 6-weektreatment. After 6 but not 3 weeks the spermatozoa in the cauda epididymidis were rendered almost completely immotile and malformed with a significant reduction in their potassium concentration and rise in their sodium concentration. No abnormal fmdings in the morphological picture of the germinal epithelium were observed under such circumstances and fluid and sperm from the rete testis were normal. Therefore, a direct action of gossypol may be exerted locally on the spermatozoa in the epididymis. Elektrolytzusammensetzung der Rete-testis-Flussigkeit, des Nebenhodenkopf-Plasmas und der Spermatozoen bei der Ratte unter Gossypol-BehandlungZusammenfassung: Die Untersuchung wird zwecks Kalium-und Natriumkonzentration in der Rete-Testis-Fliissigkeit, im Plasma des Nebenhodenkopfes und in den Spermatozoen unter Gossypol-Therapie vorgenommen. Hienu wurden Ratten mit Gossypolessigdure (1 5 mg/kg/die fir 3 bzw. 6 Wochen) gefittert. Es lieBen sich keine von der Norm abweichenden Ergebnisse bei den Elektrolyten i m Nebenhodenkopf nachweisen. Lediglich nach 6 Wochen Therapie ergab sich eine totale Unbeweglichkeit der Spermatozoen im Nebenhodenkopf bei signifkanter Reduzierung der Kaliumkonzentration und gleichzeitigem Anstieg des Natriums. Unter diesen Bedingungen ergab sich weiterhin kein von der Norm abweichendes Resultat in der Morphologie des Keimepithels; Flbigkeit und Spermatozoen aus dem Rete testis waren normal. Es diirfte sich deshalb bei der Wirkung von Gossypol um einen direkten EinfluB lokaler Art auf die Spermatozoen des Nebenhodens handeln .
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