Renal dysfunction aggravated impaired cutaneous wound healing in diabetic mice

Area of Science:

• Nephrology
• Diabetology
• Wound Healing Research

Background:

• Renal dysfunction is linked to poor wound healing in diabetic patients.
• Diabetes mellitus complicates wound repair, and co-existing kidney disease may exacerbate this.
• Understanding the interplay between diabetes, nephropathy, and cutaneous wound healing is crucial.

Purpose of the Study:

• To establish a murine model of diabetic nephropathy for studying cutaneous ulcer healing.
• To investigate the combined impact of diabetes and induced renal dysfunction on wound repair.
• To analyze the cellular and molecular mechanisms underlying impaired wound healing in this model.

Main Methods:

• Diabetic db/db mice underwent unilateral nephrectomy and contralateral kidney electrocoagulation to induce renal impairment.
• Renal function was assessed via blood urea nitrogen and urinary protein/creatinine ratio.
• Excisional wounds were created and analyzed at 7 and 14 days post-operation for healing parameters.

Main Results:

• Induced renal injury significantly elevated blood urea nitrogen and urinary protein levels in diabetic mice.
• Diabetic mice with renal injury exhibited markedly impaired wound healing.
• This impairment was characterized by decreased cellular proliferation, reduced angiogenesis, increased M1 macrophages, neutrophil infiltration, oxidative stress, and apoptosis.

Conclusions:

• The developed model effectively demonstrates that renal dysfunction exacerbates impaired cutaneous wound healing in diabetic mice.
• Key molecular changes in wounds include altered expression of TNF-α, IL-1β, and SOD2.
• These findings highlight the critical role of kidney health in managing diabetic wound complications.