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Human pregnancy-specific beta 1-glycoprotein (PSG) is found in high concentrations in the serum of pregnant women, but also has been found in the serum of males and nonpregnant females. Northern slot-blot analysis has demonstrated the presence of PSG mRNA in a variety of tissues in the rat, with the highest levels being found in the testis. Therefore, we have investigated further the expression of PSG in the rat male reproductive tract using in situ hybridization. In testes from immature and adult rats, PSG mRNA was localized in Leydig and peritubular cells, and in the walls of the interstitial blood vessels. PSG transcripts were noted also in the tunica albuginea and in the stromal tissue of the caput and cauda epididymis, prostate, and seminal vesicle from adult rats. The function of PSG is unknown, but it has been speculated that PSG may have immunosuppressive properties or that it may serve as a paracrine regulator of growth and differentiation. It is possible, then, that PSG could contribute to the immunological privilege of the testis or that it plays a role in the cellular interactions which increasingly are being shown to be important in the regulation of male reproductive tract tissues.

Localization of Pregnancy-Specific β1-Glycoprotein in the Male Reproductive Tract of the Rat by in Situ Hybridization1