The role of mouse mast cell proteases in the proliferative phase of wound healing in microdeformational wound therapy

Plast Reconstr Surg. 2014 Sep;134(3):459-67. doi: 10.1097/PRS.0000000000000432.

Abstract

Background: Stored in the secretory granules of cutaneous mouse mast cells are mouse mast cell proteases (mMCP-4, -5, and -6). Using transgenic mouse lines that lacked these enzymes, it was shown that mMCP-4 and mMCP-5 modulate the outcome of burn-induced skin injury. Whether or not these proteases also play a role in the repair of surgically damaged skin, with or without microdeformational wound therapy, remains to be determined.

Methods: Wild-type C57BL/6 mice and transgenic C57BL/6 mouse lines lacking mMCP-4, -5, or -6 were subjected to surgical wounding of their skin. Wounds were splinted with a stabilizing patch, and the mice received either microdeformational wound therapy (n = 5) or occlusive dressing (n = 5) for 7 days. Wound healing parameters were assessed in the proliferative phase.

Results: Cell proliferation in the wounded wild-type mice receiving microdeformational wound therapy was 60 ± 3 percent. Cell proliferation was only 35 ± 5 percent, 25 ± 5 percent, and 45 ± 4 percent for the treated mMCP-4-, mMCP-5-, and mMCP-6-null mice, respectively (p = 0.005). Blood vessel sprouting was higher in the control mice with microdeformational wound therapy (170 ± 40 vessels/high-power field) compared with mouse mast cell protease 6-null mice with microdeformational wound therapy (70 ± 20 vessels/high-power field; p = 0.005), and higher in the control mice with occlusive dressing (110 ± 30 vessels/high-power field) compared with mMCP-4-null mice with occlusive dressing (50 ± 20 vessels/high-power field; p = 0.01). Qualitatively, the granulation tissue of all the protease-deficient groups receiving microdeformational wound therapy was disrupted.

Conclusion: Results suggest that mouse mast cell proteases 4, 5, and 6 are mediators of the critical role mast cells play in microdeformational wound therapy in the proliferative phase of healing.

Publication types

  • Evaluation Study

MeSH terms

  • Animals
  • Biomarkers / metabolism
  • Cell Proliferation
  • Chymases / deficiency
  • Chymases / physiology*
  • Mast Cells / enzymology
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Negative-Pressure Wound Therapy*
  • Occlusive Dressings
  • Serine Endopeptidases / deficiency
  • Serine Endopeptidases / physiology*
  • Skin / enzymology
  • Skin / injuries*
  • Skin Physiological Phenomena
  • Tryptases / deficiency
  • Tryptases / physiology*
  • Wound Healing / physiology*
  • Wounds and Injuries / enzymology
  • Wounds and Injuries / physiopathology
  • Wounds and Injuries / therapy*

Substances

  • Biomarkers
  • Tpsb2 protein, mouse
  • Cma1 protein, mouse
  • Serine Endopeptidases
  • mast cell protease 4
  • Chymases
  • Tryptases