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- W2008956380 abstract "Tubulobulbar complexes (TBCs) are elaborate cytoskeleton-related structures that are formed in association with intercellular junctions in the seminiferous epithelium. They consist of a cylindrical double-membrane core composed of the plasma membranes of the two attached cells, cuffed by a dendritic network of actin filaments. TBCs are proposed to be subcellular machines that internalize intercellular junctions during the extensive junction remodeling that occurs during spermatogenesis. At the apical sites of attachment between Sertoli cells and spermatids, junction disassembly is part of the sperm release mechanism. In this study, we used immunological probes to explore junction internalization and recycling at apical TBCs in the rat seminiferous epithelium. We demonstrate that β1-integrin and nectin 2 were concentrated at the ends of TBCs and for the first time show that the early endosome marker RAB5A was also distinctly localized at the ends of TBCs that appear to be the ‘bulbar’ regions of the complexes. Significantly, we also demonstrate that the ‘long-loop’ recycling endosome marker RAB11A was co-distributed with nectin 2 at junctions with early spermatids deeper in the epithelium. Our results are consistent with the hypothesis that TBCs associated with late spermatids internalize adhesion junctions and also indicate that some of the internalized junction proteins may be recycled to form junctions with the next generation of spermatids." @default.
- W2008956380 created "2016-06-24" @default.
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- W2008956380 date "2012-03-01" @default.
- W2008956380 modified "2023-09-25" @default.
- W2008956380 title "Internalization of adhesion junction proteins and their association with recycling endosome marker proteins in rat seminiferous epithelium" @default.
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- W2008956380 doi "https://doi.org/10.1530/rep-11-0317" @default.
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