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The intricate interaction between protein endocytosis, transcytosis, recycling and endosome- or ubiquitin-mediated protein degradation determines the junction integrity in epithelial cells including Sertoli cells at the blood–testis barrier (BTB). Studies have shown that androgens and cytokines (e.g., TGF-β3) that are known to promote and disrupt BTB integrity, respectively, accelerate protein endocytosis...
In adult mammals such as rats, the blood–testis barrier (BTB) conferred by adjacent Sertoli cells in the seminiferous epithelium segregates post-meiotic germ cell development from the systemic circulation and is one of the tightest blood–tissue barriers. Yet it must “open” transiently at stages VIII to IX of the epithelial cycle to accommodate the migration of preleptotene/leptotene spermatocytes...
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