Prox1 induces lymphatic endothelial differentiation via integrin α9 and other signaling cascades

Koichi Mishima, Tetsuro Watabe, Akira Saito, Yasuhiro Yoshimatsu, Natsuko Imaizumi, Shinji Masui, Masanori Hirashima, Tohru Morisada, Yuichi Oike, Makoto Araie, Hitoshi Niwa, Hajime Kubo, Toshio Suda, Kohei Miyazono

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During embryonic lymphatic development, a homeobox transcription factor Prox1 plays important roles in sprouting and migration of a subpopulation of blood vessel endothelial cells (BECs) toward VEGF-C- expressing cells. However, effects of Prox1 on endothelial cellular behavior remain to be elucidated. Here, we show that Prox1, via induction of integrin α9 expression, inhibits sheet formation and stimulates motility of endothelial cells. Prox1-expressing BECs preferentially migrated toward VEGF-C via up-regulation of the expression of integrin α9 and VEGF receptor 3 (VEGFR3). In mouse embryos, expression of VEGFR3 and integrin α9 is increased in Prox1-expressing lymphatic endothelial cells (LECs) compared with BECs. Knockdown of Prox1 expression in human LECs led to decrease in the expression of integrin α9 and VEGFR3, resulting in the decreased chemotaxes toward VEGF-C. These findings suggest that Prox1 plays important roles in conferring and maintaining the characteristics of LECs by modulating multiple signaling cascades and that integrin α9 may function as a key regulator of lymphangiogenesis acting downstream of Prox1.

Original languageEnglish
Pages (from-to)1421-1429
Number of pages9
JournalMolecular biology of the cell
Issue number4
Publication statusPublished - 2007 Apr 1


ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

Cite this

Mishima, K., Watabe, T., Saito, A., Yoshimatsu, Y., Imaizumi, N., Masui, S., Hirashima, M., Morisada, T., Oike, Y., Araie, M., Niwa, H., Kubo, H., Suda, T., & Miyazono, K. (2007). Prox1 induces lymphatic endothelial differentiation via integrin α9 and other signaling cascades. Molecular biology of the cell, 18(4), 1421-1429.