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• W2094371010 abstract "alpha(V)beta(3), a broadly distributed member of the integrin family of adhesion receptors, has been implicated in a variety of physiological and pathophysiological events, including control of bone density, angiogenesis, apoptosis, tumor growth, and metastasis. Recently, it has been shown that activation of alpha(V)beta(3), its transition from a low- to a high-affinity/avidity state, influences its recognition of certain ligands. Bone sialoprotein (BSP) is recognized as an important ligand for alpha(V)beta(3) in processes ranging from bone formation to the homing of metastatic tumor cells. Here, the influence of alpha(V)beta(3) activation on the adhesion and migration of relevant cells to BSP has been examined. Stimulation of lymphoblastoid, osteoblastoid, and human umbilical vein endothelial cells (HUVEC) with PMA or Mn(2+) markedly enhanced alpha(V)beta(3)-dependent adhesion to BSP. alpha(V)beta(3)-mediated migration of HUVEC or osteoblastic cells to BSP was substantially enhanced by stimulation, demonstrating that alpha(V)beta(3) activation enhances both adhesive and migratory responses. However, adhesion and/or migration of certain tumor cell lines, including M21 melanoma and MDA MB435 and SKBR3 breast carcinoma cell lines, to BSP was constitutively high and was not augmented by alpha(V)beta(3)-activating stimuli. Inhibitors of the intracellular signaling molecules, phosphatidylinositol 3-kinase with wortmannin, hsp90-dependent kinases with geldanamycin, and calpain with calpeptin, but not MAPKK with PD98059, reduced the high spontaneous adhesion and migration of the M21 cells to BSP, consistent with the constitutive activation of the receptor on these tumor cells. These results indicate that the activation state of alpha(V)beta(3) can regulate cell migration and adhesion to BSP and, by extension, to other ligands of this receptor. The constitutive activation of alpha(V)beta(3) on neoplastic cells may contribute to tumor growth and metastatic potential." @default.
• W2094371010 created "2016-06-24" @default.
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• W2094371010 date "2000-02-01" @default.
• W2094371010 modified "2023-09-27" @default.
• W2094371010 title "Activation of Integrin αVβ3 Regulates Cell Adhesion and Migration to Bone Sialoprotein" @default.
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• W2094371010 doi "https://doi.org/10.1006/excr.1999.4765" @default.
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