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Background

Increased activity or expression of integrin-linked kinase (ILK), which regulates cell adhesion, migration, and proliferation, leads to oncogenesis. We identified the molecular basis for the regulation of ILK and its alternative role in conferring ERK1/2/NF-κB-mediated growth advantages to gastric cancer cells.

Results

Inhibiting ILK with short hairpin RNA or T315, a putative ILK inhibitor, abolished NF-κB-mediated the growth in the human gastric cancer cells AGS, SNU-1, MKN45, and GES-1. ILK stimulated Ras activity to activate the c-Raf/MEK1/2/ERK1/2/ribosomal S6 kinase/inhibitor of κBα/NF-κB signaling by facilitating the formation of the IQ motif-containing GTPase-activating protein 1 (IQGAP1)-Ras complex. Forced enzymatic ILK expression promoted cell growth by facilitating ERK1/2/NF-κB signaling. PI3K activation or decreased PTEN expression prolonged ERK1/2 activation by protecting ILK from proteasome-mediated degradation. C-terminus of heat shock cognate 70 interacting protein, an HSP90-associated E3 ubiquitin ligase, mediated ILK ubiquitination to control PI3K- and HSP90-regulated ILK stabilization and signaling. In addition to cell growth, the identified pathway promoted cell migration and reduced the sensitivity of gastric cancer cells to the anticancer agents 5-fluorouracil and cisplatin. Additionally, exogenous administration of EGF as well as overexpression of EGFR triggered ILK- and IQGAP1-regulated ERK1/2/NF-κB activation, cell growth, and migration.

Conclusion

An increase in ILK non-canonically promotes ERK1/2/NF-κB activation and leads to the growth of gastric cancer cells."xsd:string
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http://purl.uniprot.org/citations/25398317http://purl.uniprot.org/core/author"Chang W.T."xsd:string
http://purl.uniprot.org/citations/25398317http://purl.uniprot.org/core/author"Chen C.L."xsd:string
http://purl.uniprot.org/citations/25398317http://purl.uniprot.org/core/author"Liu H.S."xsd:string
http://purl.uniprot.org/citations/25398317http://purl.uniprot.org/core/author"Lin S.H."xsd:string
http://purl.uniprot.org/citations/25398317http://purl.uniprot.org/core/author"Lin C.F."xsd:string
http://purl.uniprot.org/citations/25398317http://purl.uniprot.org/core/author"Hong T.M."xsd:string
http://purl.uniprot.org/citations/25398317http://purl.uniprot.org/core/author"Hsieh C.Y."xsd:string
http://purl.uniprot.org/citations/25398317http://purl.uniprot.org/core/author"Shan Y.S."xsd:string
http://purl.uniprot.org/citations/25398317http://purl.uniprot.org/core/author"Tseng P.C."xsd:string
http://purl.uniprot.org/citations/25398317http://purl.uniprot.org/core/date"2014"xsd:gYear
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http://purl.uniprot.org/citations/25398317http://purl.uniprot.org/core/title"An increase in integrin-linked kinase non-canonically confers NF-kappaB-mediated growth advantages to gastric cancer cells by activating ERK1/2."xsd:string
http://purl.uniprot.org/citations/25398317http://purl.uniprot.org/core/volume"12"xsd:string
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