EphA2 in the early pathogenesis and progression of non-small cell lung cancer.

Cancer Prevention Research
Jennifer M BrannanFaye M Johnson

Abstract

Overexpression of the receptor tyrosine kinase EphA2 occurs in non-small cell lung cancer (NSCLC) and a number of other human cancers. This overexpression correlates with a poor prognosis, smoking, and the presence of Kirsten rat sarcoma (K-Ras) mutations in NSCLC. In other cancers, EphA2 has been implicated in migration and metastasis. To determine if EphA2 can promote NSCLC progression, we examined the relationship of EphA2 with proliferation and migration in cell lines and with metastases in patient tumors. We also examined potential mechanisms involving AKT, Src, focal adhesion kinase, Rho guanosine triphosphatases (GTPase), and extracellular signal-regulated kinase (ERK)-1/2. Knockdown of EphA2 in NSCLC cell lines decreased proliferation (colony size) by 20% to 70% in four of five cell lines (P < 0. 04) and cell migration by 7% to 75% in five of six cell lines (P < 0. 03). ERK1/2 activation correlated with effects on proliferation, and inhibition of ERK1/2 activation also suppressed proliferation. In accordance with the in vitro data, high tumor expression of EphA2 was an independent prognostic factor in time to recurrence (P = 0.057) and time to metastases (P = 0.046) of NSCLC patients. We also examined EphA2 expression i...Continue Reading

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