Linked Life Data

1319241

Source:http://linkedlifedata.com/resource/pubmed/id/1319241

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pubmed-article:1319241pubmed:abstractTextHeLa cells attach to a variety of substrata but spread only on collagen or gelatin. Spreading is dependent on collagen-receptor upregulation, clustering, and binding to the cytoskeleton. This study examines whether second messengers are involved in initiating the spreading process on gelatin. The levels of cytosolic free calcium ([Ca++]i), cAMP, and cytoplasmic pH (pHi) do not change during cell attachment and spreading. However, a basal level of [Ca++]i and an alkaline pH(i) are required for spreading. There is an activation of protein kinase C (PKC) and a release of arachidonic acid (AA) on attachment and before cell spreading. Inhibition of PKC does not block cell spreading, indicating that PKC activation is not essential for spreading. Inhibition of phospholipase A2 blocks cell spreading, whereas addition of exogeneous AA overcomes this inhibitory effect. Among AA metabolic pathways, inhibitors of lipoxygenase (LOX) block cell spreading, suggesting that a LOX product(s) formed from AA initiates spreading. Clustering receptors for collagen with polyclonal antibodies, or with anti-collagen-receptor antigen-binding fragments (Fab) in combination with a secondary antibody, induce AA release. Also, AA is released when cells attach to either immobilized gelatin or immobilized Arg-Gly-Asp (RGD) peptide. Thus, AA is released whenever receptor clustering is observed. Receptor occupancy is not sufficient to release AA; when cells are treated with gelatin or RGD peptide in solution or anti-collagen-receptor Fab fragments without secondary antibody, conditions where receptor clustering is not observed, AA is not released. Thus, a LOX metabolite(s) of AA formed by collagen-receptor clustering is a second messenger(s) that initiates HeLa cell spreading. LOX inhibitors also block the spreading of bovine aortic endothelial cells, chicken embryo fibroblasts, and CV-1 fibroblasts on gelatin or fibronectin, indicating that other cells might use the same second messenger system in initiating cell-substratum adhesion.lld:pubmed
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pubmed-article:1319241pubmed:authorpubmed-author:JacobsonB SBSlld:pubmed
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