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Original Studies |
Childrens Hospital (I.K., V.P., L.D., M.H.), Department of Medicine (V.I.), University of Helsinki, 00290 Helsinki, Finland; Departments of Physiology and Pediatrics, University of Turku (J.T.), 20520 Turku, Finland; Departments of Obstetrics and Gynecology (T.V., J.S.T.) and Pathology (R.H.), University of Oulu, 90220 Oulu, Finland; and Department of Pediatrics, Washington University (M.H.), St. Louis, Missouri 63110
Address all correspondence and requests for reprints to: Markku Heikinheimo, M.D., Ph.D., Childrens Hospital, Stenbäckinkatu 11, 00290 Helsinki, Finland. E-mail: markku.heikinheimo{at}helsinki.fi
GATA-4 is a highly conserved transcription factor that plays a critical role in regulating embryonic morphogenesis and cellular differentiation. Given the emerging role of GATA-4 in the development and function of murine gonads, we have now studied its role in human testis. We find that GATA-4 is expressed from early human fetal testicular development to adulthood. This transcription factor is evident in Sertoli cells through fetal and postnatal development. Expression of GATA-4 in Sertoli cells peaks at 1922 weeks gestation at the time of high circulating fetal FSH. In Leydig cells, GATA-4 is expressed during fetal period and after puberty, coinciding with the periods of active androgen synthesis in the testis; this suggests a link between GATA-4 and steroidogenesis. Also, fetal germ cells and prepubertal spermatogonia express GATA-4, and it is down-regulated in these cells after puberty. As hormonal regulation of GATA-4 in human testis was not possible to study directly, we used testicular samples from patients who had endocrine abnormalities or were hormonally treated. Testicular expression of GATA-4 in hCG-treated cryptorchidism does not differ from that in controls. In androgen resistance, GATA-4 expression in Sertoli and germ cells is weak or totally absent. GATA-4 protein is abundantly present in Sertoli and Leydig cell tumors, suggesting a relationship to tumorigenesis or tumor progression in somatic cell-derived testicular neoplasms.
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