TY - JOUR
T1 - Comprehensive analysis of mouse cancer/testis antigen functions in cancer cells and roles of TEKT5 in cancer cells and testicular germ cells
AU - Aoki, Nana
AU - Matsuia, Yasuhisa
N1 - Funding Information:
N.A. was supported by JSPS KAKENHI (grant JP17J02028) and the Division for Interdisciplinary Advanced Research and Education at Tohoku University. Y.M. was supported by KAKENHI, Innovative Area Mechanisms Regulating Gamete Formation in Animals (grant 16H06530) from MEXT, and by AMED-CREST (grant JP17gm0510017h) from the Japan Agency for Medical Research and Development.
Publisher Copyright:
Copyright © 2019 American Society for Microbiology. All Rights Reserved.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - 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 G1 arrest and apoptosis, and p27kip1 was concomitantly upregulated. Tekt5 KD also resulted in decreased levels of acetylated -tubulin and subsequent fragmentation of -III-tubulin, upregulation of HDAC6 that deacetylates -tubulin, and nuclear accumulation of SMAD3 that induces p27kip1 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 -tubulin levels were decreased in vivo by KD of Tekt5 in testis. Because acetylated -tubulin is required for sperm morphogenesis, these results suggest that TEKT5 is necessary for spermiogenesis via maintenance of acetylated -tubulin levels.
AB - 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 G1 arrest and apoptosis, and p27kip1 was concomitantly upregulated. Tekt5 KD also resulted in decreased levels of acetylated -tubulin and subsequent fragmentation of -III-tubulin, upregulation of HDAC6 that deacetylates -tubulin, and nuclear accumulation of SMAD3 that induces p27kip1 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 -tubulin levels were decreased in vivo by KD of Tekt5 in testis. Because acetylated -tubulin is required for sperm morphogenesis, these results suggest that TEKT5 is necessary for spermiogenesis via maintenance of acetylated -tubulin levels.
KW - CTA
KW - Cancer cell
KW - Germ cell
KW - Tekt5
UR - http://www.scopus.com/inward/record.url?scp=85071351083&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85071351083&partnerID=8YFLogxK
U2 - 10.1128/MCB.00154-19
DO - 10.1128/MCB.00154-19
M3 - Article
C2 - 31208979
AN - SCOPUS:85071351083
VL - 39
JO - Molecular and Cellular Biology
JF - Molecular and Cellular Biology
SN - 0270-7306
IS - 17
M1 - e00154-19
ER -