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The integrin coactivator kindlin-2 plays a critical role in angiogenesis in mice and zebrafish.

Blood. 2011 May 05;117(18):4978-87. Epub 2011 Mar 04
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摘要


Kindlin-2, a widely distributed cytoskeletal protein, has been implicated in integrin activation, and its absence is embryonically lethal in mice and causes severe developmental defects in zebrafish. Knockdown of kindlin-2 levels in endothelial cells resulted in defective adhesive and migratory responses, suggesting that angiogenesis might be aberrant even with partial reduction of kindlin-2. This hypothesis has now been tested in the kindlin-2(+/-) mice. RM1 prostate tumors grown in kindlin-2(+/-) mice had fewer blood vessels, which were thinner and shorter and supported less tumor growth compared with wild-type littermates. The vessels that did form in the kindlin-2(+/-) mice lacked smooth muscle cells and pericytes and had thinner basement membranes, indicative of immature vessels. VEGF-induced angiogenesis in matrigel implants was also abnormal in the kindlin-2(+/-) mice. Vessels in the kindlin-2(+/-) mice were leaky, and BM transplantation from kindlin-2(+/-) to WT mice did not correct this defect. Endothelial cells derived from kindlin-2(+/-) mice had integrin expression levels similar to WT mice but reduced αVβ3-dependent signaling, migration, adhesion, spreading, and tube formation. Developmental angiogenesis was markedly impaired by kindlin-2 morpholinos in zebrafish. Taken together, kindlin-2 plays an important role in pathologic and developmental angiogenesis, which arises from defective activation of integrin αVβ3.

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