Growth response of adult germ cells to rat androgen-binding protein and human sex hormone-binding globulin

Hormone Research
A GérardH Gérard

Abstract

Androgen-binding protein (ABP) is produced by Sertoli cells depending on the development and the stage of the spermatogenic cycle. Germ cell proliferation is at its peak when ABP is at its peak and secreted towards the testicular basal compartment containing spermatogonia and premeiotic spermatocytes. Rat isolated adult germ cell DNA synthesis was studied in vitro in the presence of ABP with and without steroids and in the presence of pure or recombinant sex steroid hormone-binding globulin (SHBG) using thymidine incorporation. Results are: SHBG is able to promote DNA synthesis in the absence of cofactors. Testosterone reacted negatively to the stimulatory effect of SHBG. We conclude that ABP, the physiological steroid-binding protein, should be considered as a paracrine regulator of spermatogenic DNA synthesis in the adult rat.

Citations

Feb 8, 2003·Molecular and Cellular Endocrinology·Julie Della-MariaHubert Gerard
May 20, 2004·Molecular and Cellular Endocrinology·T ForgesH Gérard

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