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• W2065001524 abstract "Small cell lung cancer (SCLC) is a rapidly progressive disease with ultimate poor outcome. SCLC has been shown to interact closely with the stromal and extracellular matrix (ECM) components of the diseased host. ECM consists of type I/IV collagen, laminin, vitronectin, and fibronectin (FN) among others. Herein, we investigated the behavior of a SCLC cell line (NCI-H446) on FN-coated surface. Over a course of 72 h, FN (10 micro g/ml) caused both increased survival and proliferation of NCI-H446 cells. Survival under serum-starved conditions increased 1.44-fold and proliferation in the presence of fetal calf serum increased by 1.30-fold. The phosphatidylinositol 3-kinase (PI3-K) inhibitor LY294002 reduced both survival and proliferation of NCI-H446 cells (0.48- and 0.27-fold, respectively), even on FN-coated surface. We next determined the effects of FN on cytoskeletal function such as cell motility/morphology and adhesion. Over a course of 24 h, FN reduced aggregation of NCI-H446 cells and induced flattened cellular morphology with neurite-like projections after 1 h, however, in the presence of LY294002, the cells rounded up. Adhesion of NCI-H446 cells also increased with FN (4.47-fold) which was abrogated with LY294002 treatment. This correlated with phosphorylation of the cytoskeletal protein p125FAK, on Tyr397, Tyr861 and Ser843 residues with FN. Even in the presence of LY294002, these serine/tyrosine residues were still phosphorylated on FN-coated surface. In contrast, the focal adhesion protein paxillin was not phosphorylated at Tyr31 with FN. In summary, FN stimulation of SCLC cells leads to enhancement of viability and changes in cytoskeletal function that are partially mediated through the PI3-K pathway." @default.
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• W2065001524 date "2003-08-21" @default.
• W2065001524 modified "2023-10-16" @default.
• W2065001524 title "Fibronectin enhances viability and alters cytoskeletal functions (with effects on the phosphatidylinositol 3-kinase pathway) in small cell lung cancer." @default.
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• W2065001524 doi "https://doi.org/10.1111/j.1582-4934.2003.tb00214.x" @default.
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