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The occurrence and possible functions of mucosal immunity in the male urogenital tract have not been extensively investigated. In this study we used immunolabeling to localize secretory component (SC) and immunoglobulin (Ig) A in the urogenital tract of the male mouse. SC was located in the ventral prostate, while SC and IgA plasma cells were both detected in the urethral glands in the pelvic and bulbous portions of the urethra. SC and IgA were not observed elsewhere in the urogenital tract. We also examined the ventral prostate and urethral glands of sham-castrated, oil-treated castrated, and testosterone-treated castrated mice. There was a striking reduction in the size of the ventral prostate and urethral glands in oil-treated castrates compared to the other two groups, based on gross and histological morphology. Morphometric analysis showed that the cell and nuclear sizes of the urethral gland acinar cells were reduced after castration and restored to normal size by testosterone treatment. Androgen receptors (AR) were localized in the nuclei of urethral gland cells by immunocytochemistry using anti-AR antibodies. Labeling of SC and IgA plasma cells was similar in the urethral glands and ventral prostates of sham- and testosterone-treated castrates, but was reduced or absent at these sites in oil-treated castrates. These studies show that the ventral prostate and urethral glands may be sites for secretory immunity in the male murine urogenital tract, and that the urethral glands are targets for testosterone.

Urethral Glands of the Male Mouse Contain Secretory Component and Immunoglobulin a Plasma Cells and are Targets of Testosterone1