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IL-1β Impaired Diabetic Wound Healing by Regulating MMP-2 and MMP-9 through the p38 Pathway
Jiezhi Dai1, Junjie Shen1, Yimin Chai1
1Department of Orthopedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China.
Mediators of Inflammation
|May 31, 2021
Summary
Elevated Interleukin-1 beta (IL-1β) in diabetes impairs fibroblast function, delaying wound healing. This study reveals IL-1β
Area of Science:
- Cell Biology
- Endocrinology
- Wound Healing Research
Background:
- Diabetes mellitus is a global metabolic disorder associated with complications like delayed wound healing.
- Insulin resistance in diabetes contributes to inflammation and impaired tissue repair processes.
- Fibroblast proliferation and migration are critical for effective wound closure.
Purpose of the Study:
- To investigate the role of Interleukin-1 beta (IL-1β) signaling in the impaired function of human fibroblasts from diabetic wound tissues.
- To elucidate the molecular mechanisms underlying delayed wound healing in diabetes, focusing on IL-1β's effects.
Main Methods:
- Analysis of IL-1β levels in diabetic versus normal wound tissue samples.
- Assessment of human fibroblast proliferation and migration in ex vivo cultures exposed to varying IL-1β concentrations.
- Evaluation of matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) expression.
- Investigation of the p38 MAPK pathway activation via p38 phosphorylation.
Main Results:
- Diabetic wound tissues exhibited significantly higher IL-1β levels compared to normal tissues.
- High concentrations of IL-1β inhibited fibroblast proliferation and migration in vitro.
- Upregulation of MMPs and downregulation of TIMPs were observed in diabetic fibroblasts, correlating with IL-1β levels.
- IL-1β was found to activate the p38 MAPK pathway, which mediated the regulation of MMPs and TIMPs.
Conclusions:
- Interleukin-1 beta (IL-1β) plays a critical role in the delayed wound healing observed in diabetes mellitus.
- IL-1β negatively impacts fibroblast proliferation and migration, essential processes for wound repair.
- The IL-1β-induced activation of the p38 MAPK pathway modulates MMP and TIMP expression, contributing to impaired wound healing in diabetic patients.
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