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Immunohistochemical localizations of carbonic anhydrase isozymes (CA-I, CA-II and CA-III) in bovine male reproductive tracts were studied. In bulls, no immunoreaction was seen after treatment with antibodies to CA-I, -II and CA-III in the testis. Specific staining for CA-III, however, was evident in peritubular cells in interstitial tissue of the testis, epididymis. CA-II activity could be detected in epithelium of the epididymis, ductus deferentis and ampulla ductus deferentis. Especially, a strong reaction for CA-II was seen in apical in epithelium of the epididymis in the initial and middle segment. CA-I activity was only founded in ductus deferentis and ampulla ductus deferentis. No or a weak reaction for CA-I, CA-II and CA-III were seen in the three accessory reproductive glands. Specific immunostaining for CA-II and CA-I could be observed in the organ, suggesting the bicarbonate in bovine semen to derive primarily from the genital tract and not accessory reproductive organs. CA-III-positive peritubular cells in interstitial tissue were also stained for alpha smooth muscle actin, and were very similar to contractile myofibroblast cells (Wrobel et al., 1979).

Immunohistolocalization of Carbonic Anhvdrase Isozymes (CA-I, CA-II and CA-III) in Bovine Male Reproductive Tracts