Cell specificity of aquaporins 0, 3, and 10 expressed in the testis, efferent ducts, and epididymis of adult rats

Journal of Andrology
L HermoRicardo Ruz

Abstract

Aquaporins (AQPs) are transmembrane protein channels that allow the rapid passage of water across an epithelium at a low energy requirement, though some also transport glycerol, urea, and solutes of various sizes. At present, 11 members of the AQP family of proteins have been described in mammals, with several being localized to the testis (AQP-7 and AQP-8), efferent ducts (AQP-1 and AQP-9), and epididymis (AQP-1 and AQP-9) of adult rats. With the discovery of expression of multiple AQPs in different tissues, we undertook a systematic analysis of several other members of the AQP family on Bouin-fixed tissues of the male reproductive tract employing light microscope immunocytochemistry. In the testis, AQP-0 expression in the seminiferous epithelium was restricted to Sertoli cells and to Leydig cells of the interstitial space; no reaction was observed in the efferent ducts or epididymis. In Sertoli cells, a semicircular pattern of staining was noted, with only one fourth or one half of the Sertoli cells of a given tubule showing a reaction product. Furthermore, while Sertoli cells at stages VI-VIII of the cycle showed intense staining, those at stages IX-XIV were least reactive, with Sertoli cells at stages I-V showing intermedia...Continue Reading

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