Linked Life Data

10764815

Source:http://linkedlifedata.com/resource/pubmed/id/10764815

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pubmed-article:10764815pubmed:abstractTextThe related adhesion focal tyrosine kinase (RAFTK), a member of the focal adhesion kinase (FAK) family and highly expressed in brain, is a key mediator of various extracellular signals that elevate intracellular Ca(2+) concentration. We investigated RAFTK and FAK signaling upon nerve growth factor (NGF) stimulation of PC12 cells. NGF induced the tyrosine phosphorylation of RAFTK in a time- and dose-dependent manner, whereas no change in the tyrosine phosphorylation of FAK was observed. Chemical inhibition showed that RAFTK phosphorylation was inhibited by blocking phospholipase Cgamma activity or intracellular Ca(2+). Blocking of extracellular Ca(2+) or phosphatidylinositol 3-kinase activity partially reduced the phosphorylation of RAFTK. In addition, disruption of actin polymerization abolished RAFTK phosphorylation, indicating that an intact actin-based cytoskeletal organization is required for RAFTK phosphorylation. The focal adhesion molecule paxillin was co-immunoprecipitated with RAFTK, and its tyrosine phosphorylation was increased in a Ca(2+)-dependent manner upon NGF stimulation. Confocal microscopic analysis demonstrated that RAFTK translocated from the cytoplasm to potential neurite initiation sites at the cell periphery, where RAFTK co-localized with paxillin and bundled actin in the early phase (within 5 min) of NGF stimulation, whereas FAK co-localized with paxillin at "point contacts," which are the primary cell adhesion sites in neuronal cells. Significant distribution of RAFTK was observed in the neurites and growth cones of differentiated PC12 cells. Furthermore, potassium depolarization induced the tyrosine phosphorylation of both RAFTK and paxillin in an intracellular Ca(2+)-dependent manner in the differentiated PC12 cells. Taken together, these results demonstrate that RAFTK is involved in NGF-induced cytoskeletal organization and may play a role in neurite and growth cone function(s).lld:pubmed
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pubmed-article:10764815pubmed:authorpubmed-author:AvrahamHHlld:pubmed
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pubmed-article:10764815pubmed:dateRevised2010-11-18lld:pubmed
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pubmed-article:10764815pubmed:articleTitleCharacterization of the tyrosine kinases RAFTK/Pyk2 and FAK in nerve growth factor-induced neuronal differentiation.lld:pubmed
pubmed-article:10764815pubmed:affiliationDivision of Experimental Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA.lld:pubmed
pubmed-article:10764815pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10764815pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:10764815pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
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