Characterization of the focal adhesion complex in human non-small cell lung cancer cell lines

Background: The important metastatic potential of lung cancers is directly correlated with cell adhesion. Cell-extracellular matrix interactions occur in specialized structures termed focal adhesion (FA) complexes. Our aims were to investigate: i) the expression of the major FA components in three lung cancer cell lines (non metastatic: A549, or metastatic: Calu-1 and H460), ii) the modifications of the FA complex occurring when apoptosis was induced by Vinorelbine in the A549 cells. Materials and Methods. The FA complex was characterized by flow cytometry, immunocytochemical staining and Western blot. Results: The expressions of alpha 3, beta 1, paxillin, p-paxillin and Grb2 varied depending on the histological type of the tumor. In apoptotic cells, the expressions of the PYK2, p-p38, PI3K and Grb2 adhesion proteins were increased. Conclusion: Our data suggest that these adhesion proteins may be implicated in the transduction of death signals.