Immunohistolocalization of the Carbonic Anhydrase Isozymes I, II and III in Equine Salivary Glands

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The immunolocalization of carbonic anhydrase isozymes in equine salivary glands was investigated for assessment of their biologic functions. In parotid glands, duct segments showed reactivity with CA-I and CA-III. CA-III was selectively located in duct segments, particularly in the basal cells of the interlobular duct. Serous acinar cells were positive for CA-I and CA-II. In submandibular glands, CA-I and CA-II were present in serous demilune and duct segments. CA-II was selectively located in the duct segments, as also noted in the parotid gland. In sublingual glands, CA-I and CA-II were located in serous demilune, as also in the case of the submandibular gland. In the duct segments, all the isozymes considered in this study were found to be present.