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              <p>Cell adhesion to the extracellular matrix or to surrounding cells plays a key role in cell proliferation and differentiation, and is critical for proper tissue homeostasis. An important pathway in adhesion-dependent cell proliferation is the Hippo signaling cascade, which is coregulated by the transcription factors Yes-associated protein 1 (YAP1) and transcriptional coactivator with PDZ-binding motif (TAZ). However, how cells integrate extracellular information at the molecular level to regulate YAP1's nuclear localization is still puzzling. Herein, we investigated the role of β1 integrins in regulating this process. We found that β1 integrin–dependent cell adhesion is critical for supporting cell proliferation in mesenchymal cells both in vivo and in vitro. β1 integrin– dependent cell adhesion relied on the relocation of YAP1 to the nucleus after the downregulation of its phosphorylated state mediated by large tumor suppressor gene 1 and 2 (LATS1/2). We also found that this phenotype relies on β1 integrin–dependent local activation of the small GTPase Rac1 at the plasma membrane to control the activity of P21 (RAC1)-activated kinase (PAK) of group 1. We further report that the regulatory protein merlin (neurofibromin 2, NF2) interacts with both YAP1 and LATS1/2 via its C-terminal moiety and FERM domain, respectively. PAK-mediated merlin phosphorylation on Ser-518 reduced merlin's interactions with both LATS1/2 and YAP1, resulting in YAP1 dephosphorylation and nuclear shuttling. Our results highlight Rac1/PAK1 as major players in YAP1 regulation triggered by cell adhesion.</p>
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          <desc>
            <address>
              <addrLine>Route de Saclay, 91120 Palaiseau Cedex, France</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://www.ip-paris.fr</ref>
          </desc>
        </org>
      </listOrg>
      <listOrg type="projects">
        <org type="anrProject" xml:id="projanr-45366" status="VALID">
          <idno type="anr">ANR-15-CE14-0010</idno>
          <orgName>LYSBONE</orgName>
          <desc>Acide lysophosphatidique et contrôle de la masse osseuse</desc>
          <date type="start">2015</date>
        </org>
      </listOrg>
    </back>
  </text>
</TEI>