Dynamics of actin polymerisation during the mammalian single-cell wound healing response

The contribution of actomyosin contractile rings in the wound healing program of somatic cells as never been directly assessed. This contrast with the events characterising the wound healing response of in wounded Xenopus oocytes, in which formation and contraction of an actomyosin ring provides a platform for cytoskeletal repair and drives the restoration of proper plasma membrane composition at the site of injury. As such, we aimed to characterize, using high-resolution live-cell confocal microscopy, the cytoskeletal repair dynamics of HeLa cells. We confirm here that the F-actin enrichment that characterizes the late repair program of laser-wounded cells is mostly uniform and is not associated with co-enrichment of myosin-II or the formation of concentric zones of RhoA and Cdc42 activity.