Deciphering the Dysregulating IGF-1-SP1-CD248 Pathway in Fibroblast Functionality during Diabetic Wound Healing

Area of Science:

• Cell Biology
• Dermatology
• Molecular Biology

Background:

• Diabetic ulcer progression is linked to reduced fibroblast activity.
• CD248, a glycoprotein in activated fibroblasts, is crucial for wound healing.
• The specific role and regulation of CD248 in diabetic wound healing are unclear.

Purpose of the Study:

• To investigate the role of CD248 in diabetic wound healing.
• To identify the regulatory pathway controlling CD248 expression in fibroblasts.

Main Methods:

• Analysis of CD248 expression in human and mouse diabetic wound samples.
• Single-cell transcriptome analysis to identify fibroblast subtypes.
• Investigated the role of Insulin-like Growth Factor 1 (IGF-1) and SP1 transcription factor.
• Utilized immunohistochemical staining and explored the impact of Tumor Necrosis Factor alpha (TNFα).

Main Results:

• CD248 expression is significantly decreased in diabetic wounds.
• A reduction in CD248-enriched secretory-reticular fibroblasts was observed.
• IGF-1, via the Akt/mTOR pathway and SP1, regulates CD248 expression.
• Elevated TNFα in diabetes leads to IGF-1 resistance, inhibiting CD248 induction.

Conclusions:

• The IGF-1-SP1-CD248 signaling axis is critical for activating fibroblasts in wound healing.
• Reduced CD248 expression in diabetic wounds is linked to fibroblast dysfunction.
• Targeting the IGF-1-SP1-CD248 axis presents a potential therapeutic strategy for diabetic ulcers.