Defective membrane repair machinery impairs survival of invasive cancer cells
Cancer cells are able to reach distant tissues by migration and invasion processes. Enhanced ability to cope with physical stresses leading to cell membrane damages may offer to cancer cells high survival rate during metastasis. Consequently, down-regulation of the membrane repair machinery may be a therapeutic avenue for inhibiting metastasis. We show that migration of MDA-MB-231 cells on collagen I fibrils induces disruptions of plasma membrane and pullout of membrane fragments in the wake of cells. These cells are able to reseal membrane damages thanks to annexins (Anx) that are highly expressed in invasive cancer cells. In vitro membrane repair assays reveal that MDA-MB-231 cells respond heterogeneously to membrane injury and some of them possess very efficient repair machinery. Finally, we show that silencing of AnxA5 and AnxA6 leads to major defect of the membrane repair machinery responsible for the death of migrating MDA-MB-231 cells. Inhibition of membrane repair machinery may therefore represent a promising avenue for annihilating cancer metastasis. SummaryCancer cells are able to reach distant tissues by migration and invasion processes. This study shows that inhibition of the plasma membrane repair machinery may represent a promising avenue for annihilating cancer metastasis.