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>Comprehensive Analysis of Mouse Cancer/Testis Antigen Functions in Cancer Cells and Roles of TEKT5 in Cancer Cells and Testicular Germ Cells
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Comprehensive Analysis of Mouse Cancer/Testis Antigen Functions in Cancer Cells and Roles of TEKT5 in Cancer Cells and Testicular Germ Cells
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机译：Comprehensive Analysis of Mouse Cancer/Testis Antigen Functions in Cancer Cells and Roles of TEKT5 in Cancer Cells and Testicular Germ Cells
The cancer/testis antigen (CTA) genes were identified as human genes preferentially expressed in cancer cells and testis, but the contribution of CTAs to cancer and male germ cell development is unclear. In this study, we comprehensively examined mouse CTA functions and found that the majority of CTAs are involved in growth and/or survival of cancer cells. We focused on one mouse CTA gene, Tekt5, for its detailed functional analysis. Tekt5 knockdown (KD) in ovarian cancer cells caused G(1) arrest and apoptosis, and p27(kip1) was concomitantly upregulated. Tekt5 KD also resulted in decreased levels of acetylated alpha-tubulin and subsequent fragmentation of beta-III-tubulin, upregulation of HDAC6 that deacetylates alpha-tubulin, and nuclear accumulation of SMAD3 that induces p27(kip1) expression. Because depolymerization of tubulin is known to cause translocation of SMAD3 to the nucleus, these results together suggested that TEKT5 negatively regulates Hdac6 expression and consequently maintains cell cycle via stabilization of tubulin. We also found that the number of spermatids was significantly decreased and acetylated alpha-tubulin levels were decreased in vivo by KD of Tekt5 in testis. Because acetylated alpha-tubulin is required for sperm morphogenesis, these results suggest that TEKT5 is necessary for spermiogenesis via maintenance of acetylated alpha-tubulin levels.
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