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Receptors for two salmon gonadotropins, GTH I and GTH II, were localized by use of in vitro ligand autoradiography of coho salmon gonads at various stages of sexual maturation. The results in both sexes revealed the presence of two types of GTH receptors: type I (GTH-RI), which interacts with both GTHs, and type II (GTH-RII), which interacts specifically with GTH II. GTH-RI was found at all stages of spermatogenesis examined and was localized on cells that were most likely Sertoli cells; however, it could not be determined whether GTH-RI was also localized on Leydig cells. In contrast, GTH-RII was found only in Leydig cells in the testis from a spermiating fish. In the vitellogenic ovary, GTH-RI was localized in the thecal layer and intensely on granulosa cells; in the preovulatory follicle, in contrast, GTH-RI was found in the thecal layer and in interstitial connective tissue, but not in the granulosa layer. Among all the stages of oogenesis examined, only granulosa cells of the preovulatory follicle exhibited GTH-RII. The appearance of GTH-RII coincides well with the increase in plasma levels of GTH II that occurs during final oocyte maturation and spermiation in coho salmon. The nature, distribution, and timing of appearance of these two receptors can explain, at least in part, the results of previous studies on steroidogenic activities of the two GTHs. The present study also suggests the functional homology of salmon GTH I and GTH II to mammalian FSH and LH, respectively, during gonadal development.

Localization of Two Gonadotropin Receptors in the Salmon Gonad by in Vitro Ligand Autoradiography1