Semaphorins guide the entry of dendritic cells into the lymphatics by activating myosin II.


The recirculation of leukocytes is essential for proper immune responses. However, the molecular mechanisms that regulate the entry of leukocytes into the lymphatics remain unclear. Here we show that plexin-A1, a principal receptor component for class III and class VI semaphorins, was crucially involved in the entry of dendritic cells (DCs) into the lymphatics. Additionally, we show that the semaphorin Sema3A, but not Sema6C or Sema6D, was required for DC transmigration and that Sema3A produced by the lymphatics promoted actomyosin contraction at the trailing edge of migrating DCs. Our findings not only demonstrate that semaphorin signals are involved in DC trafficking but also identify a previously unknown mechanism that induces actomyosin contraction as these cells pass through narrow gaps.

DOI: 10.1038/ni.1885

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@article{Takamatsu2010SemaphorinsGT, title={Semaphorins guide the entry of dendritic cells into the lymphatics by activating myosin II.}, author={Hyota Takamatsu and Noriko Takegahara and Yukinobu Nakagawa and Michio Tomura and Masahiko Taniguchi and Roland H Friedel and Helen Rayburn and Marc Tessier-Lavigne and Yutaka Yoshida and Tatsusada Okuno and Masayuki Mizui and Sujin Kang and Satoshi Nojima and Tohru Tsujimura and Yuji Nakatsuji and Ichiro Katayama and Toshihiko Toyofuku and Hitoshi Kikutani and Atsushi Kumanogoh}, journal={Nature immunology}, year={2010}, volume={11 7}, pages={594-600} }