Importance of forkhead transcription factor Fkhl18 for development of testicular vasculature

Yuko Sato, Takashi Baba, Mohamad Zubair, Kanako Miyabayashi, Yoshiro Toyama, Mamiko Maekawa, Akiko Owaki, Hirofumi Mizusaki, Tatsuya Sawamura, Kiyotaka Toshimori, Ken Ichirou Morohashi, Yuko Katoh-Fukui

研究成果: Contribution to journalArticle査読

14 被引用数 (Scopus)


Forkhead transcription factors are characterized by a winged helix DNA binding domain, and the members of this family are classified into 20 subclasses by phylogenetic analyses. Fkhl18 is structurally unique, and is classified into FoxS subfamily. We found Fkhl18 expression in periendothelial cells of the developing mouse fetal testis. In an attempt to clarify its function, we generated mice with Fkhl18 gene disruption. Although KO mice developed normally and were fertile in both sexes, we frequently noticed unusual blood accumulation in the fetal testis. Electron microscopic analysis demonstrated frequent gaps, measuring 100-400 nm, in endothelial cells of blood vessels. These gaps probably represented ectopic apoptosis of testicular periendothelial cells, identified by caspase-3 expression, in KO fetuses. No apoptosis of endothelial cells was noted. Fkhl18 suppressed the transcriptional activity of FoxO3a and FoxO4. Considering that Fas ligand gene expression is activated by Foxs, the elevated activity of Foxs in the absence of Fkhl18 probably explains the marked apoptosis of periendothelial cells in Fkhl18 KO mice.

ジャーナルMolecular Reproduction and Development
出版ステータス出版済み - 9 2008

All Science Journal Classification (ASJC) codes

  • 遺伝学
  • 発生生物学
  • 細胞生物学


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