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Activated protein C (APC) is serine protease hemostasis, independent of its anticoagulant activity, exhibits anti-inflammatory and anti-apoptotic properties that determine the possibility of the protective effects of APC in different diseases, including sepsis and chronic wound healing. APC, binding of endothelial protein C receptor (EPCR) and specifically cleaving PAR1 receptor and releasing peptide agonist PAR1 stabilizes not only endothelial cells, but also many others, including epidermal keratinocytes of the skin. We develop the hypothesis that the cytoprotective effect of APC on the cells, involved in wound healing, seem to imitate peptide - analogous of PAR1 "tethered ligand" that activate PAR1. In our work, we synthesized a peptide (AP9) – analogue of PAR1 tethered ligand, released by APC, and firstly showed that peptide AP9 (0.1-10 мM), like to APC (0.01-100 nM), stimulates the proliferative activity of human primary keratinocytes. Using a model of the formation of epithelial wounds in vitro we found that peptide AP9, as well as protease APC, accelerates wound healing. Using specific antibodies to the receptor PAR1 and EPCR was studied the receptor mechanism of AP9 action in wound healing compared with the action of APС. The necessity of both receptors – PAR1 and EPСR, for proliferative activity of agonists was revealed. Identified in our work imitation by peptide AP9 – PAR1 ligand, APC acts on keratinocytes suggests the possibility of using a peptide AP9 to stimulate tissue repair.

biomedicinskaâ himiâ

Peptide-agonist of protease-activated receptor (PAR 1), similar to activated protein C, promotesproliferation in keratinocytes and wound healing of epithelial layer