title: Receptor-Interacting Protein Kinase 3 Deficiency Delays Cutaneous Wound Healing.
abstract: Wound healing consists of a complex, dynamic and overlapping process involving inflammation, proliferation and tissue remodeling. A better understanding of wound healing process at the molecular level is needed for the development of novel therapeutic strategies. Receptor-interacting protein kinase 3 (RIPK3) controls programmed necrosis in response to TNF-α during inflammation and has been shown to be highly induced during cutaneous wound repair. However, its role in wound healing remains to be demonstrated. To study this, we created dorsal cutaneous wounds on male wild-type (WT) and RIPK3-deficient (Ripk3-/-) mice. Wound area was measured daily until day 14 post-wound and skin tissues were collected from wound sites at various days for analysis. The wound healing rate in Ripk3-/- mice was slower than the WT mice over the 14-day course; especially, at day 7, the wound size in Ripk3-/- mice was 53% larger than that of WT mice. H&E and Masson-Trichrome staining analysis showed impaired quality of wound closure in Ripk3-/- wounds with delayed re-epithelialization and angiogenesis and defected granulation tissue formation and collagen deposition compared to WT. The neutrophil infiltration pattern was altered in Ripk3-/- wounds with less neutrophils at day 1 and more neutrophils at day 3. This altered pattern was also reflected in the differential expression of IL-6, KC, IL-1β and TNF-α between WT and Ripk3-/- wounds. MMP-9 protein expression was decreased with increased Timp-1 mRNA in the Ripk3-/- wounds compared to WT. The microvascular density along with the intensity and timing of induction of proangiogenic growth factors VEGF and TGF-β1 were also decreased or delayed in the Ripk3-/- wounds. Furthermore, mouse embryonic fibroblasts (MEFs) from Ripk3-/- mice migrated less towards chemoattractants TGF-β1 and PDGF than MEFs from WT mice. These results clearly demonstrate that RIPK3 is an essential molecule to maintain the temporal manner of the normal progression of wound closure.
authors.affiliation: Department of Surgery, Hofstra North Shore-LIJ School of Medicine, Manhasset, New York, United States of America.
authors.forename: Andrew
authors.initials: A
authors.lastname: Godwin
authors.affiliation: Center for Translational Research, The Feinstein Institute for Medical Research, Manhasset, New York, United States of America.
authors.forename: Archna
authors.initials: A
authors.lastname: Sharma
authors.affiliation: Department of Surgery, Hofstra North Shore-LIJ School of Medicine, Manhasset, New York, United States of America; Center for Translational Research, The Feinstein Institute for Medical Research, Manhasset, New York, United States of America.
authors.forename: Weng-Lang
authors.initials: WL
authors.lastname: Yang
authors.affiliation: Center for Translational Research, The Feinstein Institute for Medical Research, Manhasset, New York, United States of America.
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Surgery, Hofstra North Shore-LIJ School of Medicine, Manhasset, New York, United States of America.
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Nicastro
authors.affiliation: Department of Surgery, Hofstra North Shore-LIJ School of Medicine, Manhasset, New York, United States of America.
authors.forename: Gene F
authors.initials: GF
authors.lastname: Coppa
authors.affiliation: Department of Surgery, Hofstra North Shore-LIJ School of Medicine, Manhasset, New York, United States of America; Center for Translational Research, The Feinstein Institute for Medical Research, Manhasset, New York, United States of America.
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
mesh_terms: D000818:Animals; D002633:Chemotaxis; D005347:Fibroblasts / Q000166:cytology; D015971:Gene Expression Regulation, Enzymologic; D008297:Male; D020780:Matrix Metalloproteinase 9 / Q000235:genetics; D051379:Mice; D018919:Neovascularization, Physiologic; D053422:Receptor-Interacting Protein Serine-Threonine Kinases / Q000172:deficiency*; D012867:Skin / Q000098:blood supply / Q000166:cytology; D012879:Skin Physiological Phenomena; D014945:Wound Healing
chemical_list: D053422:Receptor-Interacting Protein Serine-Threonine Kinases; C485615:Ripk3 protein, mouse; D020780:Matrix Metalloproteinase 9