Abstract:
:The protein tyrosine kinase pp125FAK (focal adhesion kinase, or FAK) is expressed by a variety of cell types and has been implicated in integrin-mediated signaling events. We explored the potential functions of FAK by expressing it de novo in a cell type lacking FAK. We showed previously that cultured human macrophages lack FAK yet still have well-formed focal contacts. Adenovirus-mediated expression of FAK results in the appearance of FAK protein, which localizes to focal contacts and becomes tyrosine-phosphorylated without perturbing overall cell morphology or focal contacts. FAK associates with CSK 48 h after infection and recruits it to focal contacts. Tyrosine phosphorylation of p130cas but not of paxillin is stimulated after FAK expression. The phosphorylation of p130cas is lost at 48 h in parallel with CSK accumulation in focal contacts. The ERK2 form of MAP kinase is similarly activated at 12-24 h, but it also returns to low levels at 48 h. These findings demonstrate that FAK can be reconstituted to focal contacts in cells that lack it without affecting cell morphology or focal contact structure. FAK can regulate the distribution and activities of elements of the MAP kinase signaling pathway.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
De Nichilo MO,Katz BZ,O'Connell B,Yamada KMdoi
10.1002/(SICI)1097-4652(199902)178:2<164::AID-JCP5keywords:
subject
Has Abstractpub_date
1999-02-01 00:00:00pages
164-72issue
2eissn
0021-9541issn
1097-4652pii
10.1002/(SICI)1097-4652(199902)178:2<164::AID-JCP5journal_volume
178pub_type
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