Roles played by a subset of integrin signaling molecules in cadherin-based cell–cell adhesion

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  • Hajime Yano
    1Department of Molecular Biology, Osaka Bioscience Institute, Osaka 565-0874, Japan
  • Yuichi Mazaki
    1Department of Molecular Biology, Osaka Bioscience Institute, Osaka 565-0874, Japan
  • Kazuo Kurokawa
    2Department of Tumor Virology, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan
  • Steven K. Hanks
    3Department of Cell Biology, Vanderbilt University School of Medicine, Nashville, TN 37232
  • Michiyuki Matsuda
    2Department of Tumor Virology, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan
  • Hisataka Sabe
    1Department of Molecular Biology, Osaka Bioscience Institute, Osaka 565-0874, Japan

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<jats:p>Integrins can intercommunicate with cadherins. Here, we examined their possible relationship by use of small interfering RNA–mediated protein knockdown in HeLa cells. We found that a subset of integrin signaling molecules, namely Fak and paxillin, but not p130 Crk-associated substrate or proline-rich tyrosine kinase 2, participate in processes regulating N-cadherin–based cell–cell adhesion. Paxillin was found to be required primarily for the recruitment of Fak to robust focal adhesions. Our results suggest that at least some signals involving Fak are linked to a mechanism down-regulating Rac1 activity at the cell periphery, which appears to be important for the formation of N-cadherin–based adhesions in motile cells. Our analyses simultaneously exemplified the essential role of Fak in the maintenance of cell–cell adhesions in collective cell migration, a type of migration occurring in embryonic development and carcinoma invasion.</jats:p>

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