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Protocol to Create Chronic Wounds in Diabetic Mice
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Complement Activation and STAT4 Expression Are Associated with Early Inflammation in Diabetic Wounds.

Kenji M Cunnion1,2,3, Neel K Krishna1,2, Haree K Pallera1

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Diabetic wounds show early activation of the complement system (CS) and STAT4, contributing to inflammation and delayed healing. Targeting CS and STAT4 may improve wound repair in diabetes.

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Area of Science:

  • Immunology
  • Wound Healing
  • Diabetic Complications

Background:

  • Diabetic non-healing wounds are a significant clinical challenge, often linked to unresolved inflammation.
  • The complement system (CS) and Signal transducer and activator of transcription 4 (STAT4) are implicated in inflammatory processes and potentially in impaired wound healing.

Purpose of the Study:

  • To investigate the role of the complement system (CS) and STAT4 in early-stage diabetic skin wounds.
  • To characterize the expression and activation of CS and STAT4 in a mouse model of diabetic wounds.

Main Methods:

  • Utilized db/db mice as a model for diabetic skin wounds.
  • Assessed complement activation via C5a levels and C3 fragment deposition.
  • Evaluated the effect of a complement inhibitor (PIC1) on inflammation and leukocyte infiltration.
  • Measured STAT4, CCL2, and CCR2 expression in wound tissues.

Main Results:

  • Complement system activation was evident early in diabetic wounds, indicated by increased C5a and C3 deposition.
  • Diabetic wounds exhibited a significant increase in nucleated cells compared to controls.
  • STAT4, CCL2, and CCR2 expression were significantly elevated in early diabetic wounds.
  • PIC1 treatment reduced inflammation and leukocyte infiltration in the wounds.

Conclusions:

  • Early activation of the complement system and STAT4 contributes to unresolved inflammation in diabetic wounds.
  • Targeting the complement system and STAT4 presents a promising therapeutic strategy for improving diabetic wound healing.