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PMID:15166238

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Citation

Xia, H, Nho, RS, Kahm, J, Kleidon, J and Henke, CA (2004) Focal adhesion kinase is upstream of phosphatidylinositol 3-kinase/Akt in regulating fibroblast survival in response to contraction of type I collagen matrices via a beta 1 integrin viability signaling pathway. J. Biol. Chem. 279:33024-34

Abstract

The beta(1) integrin, functioning as a mechanoreceptor, senses a mechanical stimulus generated during collagen matrix contraction and down-regulates the phosphatidylinositol 3-kinase (PI3K)/Akt survival signal triggering apoptosis. The identities of integrin-associated signal molecules in the focal adhesion complex that are responsible for propagating beta(1) integrin viability signals in response to collagen matrix contraction are not known. Here we show that in response to collagen contraction focal adhesion kinase (FAK) is dephosphorylated. In contrast, enforced activation of beta(1) integrin by anti-beta(1) integrin antibody, which protects fibroblasts from apoptosis, preserves FAK phosphorylation. We demonstrate that ligation of beta(1) integrin by type I collagen or by enforced activation of beta(1) integrin by antibody promotes phosphorylation of FAK, p85 subunit of PI3K, and serine 473 of Akt. Wortmannin inhibited Akt but not FAK phosphorylation in response to enforced activation of beta(1) integrin by antibody. Blocking FAK by pharmacologic inhibition or by dominant negative FAK attenuated phosphorylation of p85 subunit of PI3K and Akt. Dominant negative FAK augmented fibroblast apoptosis during collagen contraction, and this was associated with diminished Akt activity. Constitutively active FAK augmented levels of p85 subunit of PI3K and Akt phosphorylation, and fibroblasts were protected from apoptosis. Our data identify a novel role for FAK, functioning upstream of PI3K/Akt, in transducing a beta(1) integrin viability signal in collagen matrices.

Links

PubMed Online version:10.1074/jbc.M313265200

Keywords

Adenoviridae/genetics; Androstadienes/pharmacology; Anoikis; Antigens, CD29/metabolism; Apoptosis; Blotting, Western; Cell Survival; Cells, Cultured; Collagen/chemistry; DNA, Complementary/metabolism; Down-Regulation; Enzyme Inhibitors/pharmacology; Fibrinogen/metabolism; Fibroblasts/metabolism; Focal Adhesion Kinase 1; Focal Adhesion Protein-Tyrosine Kinases; Genes, Dominant; Humans; In Situ Nick-End Labeling; Models, Biological; Phosphatidylinositol 3-Kinases/metabolism; Phosphorylation; Precipitin Tests; Protein Structure, Tertiary; Protein-Tyrosine Kinases/metabolism; Retroviridae/genetics; Signal Transduction; Time Factors; Up-Regulation

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

HUMAN:FAK1

involved_in

GO:0001934: positive regulation of protein phosphorylation

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:FAK1

involved_in

GO:0008360: regulation of cell shape

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:FAK1

involved_in

GO:0014068: positive regulation of phosphatidylinositol 3-kinase signaling

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:FAK1

involved_in

GO:0043066: negative regulation of apoptotic process

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:FAK1

involved_in

GO:0051897: positive regulation of protein kinase B signaling

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

See also

References

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