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Springer Science and Business Media LLC Nature Communications 14(1)
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    초록·키워드

    The integrins and G protein-coupled receptors are both fundamental in cell biology. The cross talk between these two, however, is unclear. Here we show that β<sub>3</sub> integrins negatively regulate G protein-coupled signaling by directly inhibiting the Gα<sub>13</sub>-p115RhoGEF interaction. Furthermore, whereas β<sub>3</sub> deficiency or integrin antagonists inhibit integrin-dependent platelet aggregation and exocytosis (granule secretion), they enhance G protein-coupled RhoA activation and integrin-independent secretion. In contrast, a β<sub>3</sub>-derived Gα<sub>13</sub>-binding peptide or Gα<sub>13</sub> knockout inhibits G protein-coupled RhoA activation and both integrin-independent and dependent platelet secretion without affecting primary platelet aggregation. In a mouse model of myocardial ischemia/reperfusion injury in vivo, the β<sub>3</sub>-derived Gα<sub>13</sub>-binding peptide inhibits platelet secretion of granule constituents, which exacerbates inflammation and ischemia/reperfusion injury. These data establish crucial integrin-G protein crosstalk, providing a rationale for therapeutic approaches that inhibit exocytosis in platelets and possibly other cells without adverse effects associated with loss of cell adhesion.

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