Abstract
The Deleted in AZoospermia (DAZ) gene family plays an essential role in spermatogenesis and fertility in mammals. This gene family contains two autosomal genes, BOULE and DAZL (DAZ-Like), and the DAZ gene cluster in the Y chromosome. CDC25A (a cell cycle regulator) has been proposed as a putative substrate for the RNA-binding proteins of DAZ family. However, mechanisms regulating DAZ gene expression have been poorly investigated. We analyzed immunohistochemical localization of DAZL, BOULE and CDC25A, as well as the involvement of testosterone (T) and insulin-like growth factor 1 (IGF1) in the modulation of mRNA expression for DAZL, BOULE and CDC25A in the adult mouse testes. It was found that DAZL was mostly immunolocalized in spermatogonia, while BOULE and CDC25A were detected in spermatocytes and round spermatids. Three-color immunofluorescence showed that DAZL-positive cells also expressed proliferating cell nuclear antigen (PCNA). In vitro incubation of the testes showed that neither T nor IGF1 affected DAZL mRNA expression. However, either T or IGF1 increased BOULE mRNA expression. Antiandrogen flutamide abolished the T-induced increase in BOULE mRNA, but had no effect on the IGF1 induced increase in the mouse testes. Extr...Continue Reading
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