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• W2087016227 startingPage "385" @default.
• W2087016227 abstract "Our goal was to evaluate early signaling events that occur as epithelial cells make initial contact with a substrate and to correlate them with phosphorylation. The corneal epithelium was chosen to study signaling events that occur with adhesion because it represents a simple system in which the tissue adheres to a basal lamina, is avascular, and is bathed by a tear film in which changes in the local environment are hypothesized to alter signaling. To perform these experiments we developed a novel adhesion assay to capture the changes in intracellular Ca(2+) and pH that occur as a cell makes its initial contact with a substrate. The first transient cytosolic Ca(2+) peak was detected only as the cell made contact with the substrate and was demonstrated using fluorimetric assays combined with live cell imaging. We demonstrated that this transient Ca(2+) peak always preceded a cytoplasmic alkalization. When the intracellular environment was modified, the initial response was altered. Pretreatment with 1,2-bis(o-aminophenoxy)ethane-N,N, N'N'-tetraacetic acid (BAPTA), an intracellular chelator, inhibited Ca(2+) mobilization, whereas benzamil altered the duration of the oscillations. Thapsigargin caused an initial Ca(2+) release followed by a long attenuated response. An inositol triphosphate analog induced a large initial response, whereas heparin inhibited Ca(2+) oscillations. Inhibitors of tyrosine phosphorylation did not alter the initial mobilization of cytosolic Ca(2) but clearance of cytosolic Ca(2+) was inhibited. Exposing corneal epithelial cells to BAPTA, benzamil, or thapsigargin also attenuated the phosphorylation of the focal adhesion protein paxillin. However, although heparin inhibited Ca(2+) oscillations, it did not alter phosphorylation of paxillin. These studies demonstrate that the initial contact that a cell makes with a substrate modulates the intracellular environment, and that changes in Ca(2+) mobilization can alter later signaling events such as the phosphorylation of specific adhesion proteins. These findings may have implications for wound repair and development." @default.
• W2087016227 created "2016-06-24" @default.
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• W2087016227 date "2000-01-01" @default.
• W2087016227 modified "2023-10-09" @default.
• W2087016227 title "Calcium signaling induced by adhesion mediates protein tyrosine phosphorylation and is independent of pHi" @default.
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• W2087016227 doi "https://doi.org/10.1002/1097-4652(200009)184:3<385::aid-jcp14>3.0.co;2-7" @default.
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