Laminin-111 peptide C16 regulates invadopodia activity of malignant cells through ?1 integrin, Src and ERK 1/2.

ABSTRACT: Laminin peptides influence tumor behavior. In this study, we addressed whether laminin peptide C16 (KAFDITYVRLKF, ?1 chain) would increase invadopodia activity of cells from squamous cell carcinoma (CAL27) and fibrosarcoma (HT1080). We found that C16 stimulates invadopodia activity over time in both cell lines. Rhodamine-conjugated C16 decorates the edge of cells, suggesting a possible binding to membrane receptors. Flow cytometry showed that C16 increases activated ?1 integrin, and ?1 integrin miRNA-mediated depletion diminishes C16-induced invadopodia activity in both cell lines. C16 stimulates Src and ERK 1/2 phosphorylation, and ERK 1/2 inhibition decreases peptide-induced invadopodia activity. C16 also increases cortactin phosphorylation in both cells lines. Based on our findings, we propose that C16 regulates invadopodia activity over time of squamous carcinoma and fibrosarcoma cells, probably through ?1 integrin, Src and ERK 1/2 signaling pathways.

SUBMITTER: Siqueira AS 

PROVIDER: S-EPMC5216987 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature