Abstract
In mouse testis, claudin-11 is responsible for the formation of specific parallel TJ strands of the blood–testis barrier (BTB). Concerning the human BTB, there is no information about the transmembrane TJ proteins. We recently demonstrated the loss of functional integrity of the BTB in testicular intraepithelial neoplasia (TIN), associated with a dislocation of the peripheral TJ proteins ZO-1 and ZO-2. Here, we determined the expression and distribution of claudin-11 at the human BTB in seminiferous tubules with normal spermatogenesis (NSP) and TIN. Immunostaining of claudin-11 revealed intense signals at the basal BTB region in seminiferous epithelium with NSP. Within TIN tubules, claudin-11 immunostaining became diffuse and cytoplasmic. Double immunogold labeling demonstrated a co-localization of claudin-11 and ZO-1 at the inter-Sertoli cell junctions. Real-time RT-PCR of laser microdissected tubules showed an up-regulation of claudin-11 mRNA in TIN. Additionally, increased claudin-11 protein was observed by Western blot. We conclude that claudin-11 constitutes a TJ protein at the human BTB. In TIN tubules, claudin-11 is up-regulated and dislocated from the BTB. Therefore, the disruption of the BTB is related to a dysfunction of claudin-11 and not to a failure of its expression.
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The excellent technical assistance of Marlene Stein and Anne Hild is gratefully acknowledged.
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Fink, C., Weigel, R., Fink, L. et al. Claudin-11 is over-expressed and dislocated from the blood–testis barrier in Sertoli cells associated with testicular intraepithelial neoplasia in men. Histochem Cell Biol 131, 755–764 (2009). https://doi.org/10.1007/s00418-009-0576-2
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DOI: https://doi.org/10.1007/s00418-009-0576-2