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With immunocytochemistry, we have determined distribution of sodium, potassium-adenosine triphosphatase (Na+, K+-ATPase) and of three isoenzymes of carbonic anhydrase (CA) and have shown absence of the chloride channel, Band 3 protein, in the genital tract of female rodents. Staining for Na+,K+-ATPase was strongest in the ampullary oviduct and uterine glands in the mouse. In the mouse and rat ovary, immunostaining evidenced CA I, II, and III in theca interna cells where the enzyme could affect the pH of follicular fluid. The zona pellucida of the ovary and cytoplasmic foci in follicular granulosa cells stained for content of only CA I in mouse ovary, suggesting synthesis of a zona pellucida component by granulosa cells. CA II in mouse oviductal epithelium increased from the negative infundibulum to the variably positive ampulla and isthmus to the uniformly positive interstitial segment. The content of CA III varied inversely to that of CA II. The prevalence of CA II-positive cells apparently corresponded with that of nonciliated cells, whereas abundance of CA III-positive cells concurred with that of ciliated cells in regions of the mouse oviduct. The rat oviduct lacked CA II but, like that of the mouse, showed CA III in the proximal region. The staining for CA II in surface epithelium exceeded the reactivity in glandular epithelium in the mouse uterus, except during estrus. In contrast, rat uterus evidenced CA II in glandular but not surface epithelium. These results testify to possible significance of various ion transport mechanisms for biologic activities of diverse cells in the female genital tract.

Immunocytochemistry of Ion Transport Mediators in the Genital Tract of Female Rodents