Male human genital tract was treated for the immunohistochemical demon
stration of secretory IgA in order to verify its own possible antimicr
obial properties. An intensely positive immunoreaction for sIgA in the
epithelial cells of prostate and urethral glands was observed; in the
same organs the presence of immunoreactive cell clusters in the subep
ithelial layers was noted. Immunostaining in the epithelia of deferent
duct, seminal vesicle, deferential ampulla, ejaculatory duct and bulb
ourethral glands was absent. The findings suggest that a local immune
response sIgA-mediated is present in the lower male genital tract.