[Expression and effect of microRNA-627 in human hypertrophic scar]

Area of Science:

• Molecular Biology
• Dermatology
• Biochemistry

Background:

• Hypertrophic scars result from dysregulated fibroblast activity.
• MicroRNAs play crucial roles in cellular processes and disease development.

Purpose of the Study:

• To investigate the expression of microRNA-627 (miR-627) in human hypertrophic scars.
• To determine the effect of miR-627 on fibroblast proliferation, apoptosis, and related protein expression.

Main Methods:

• Real-time quantitative PCR to measure miR-627 mRNA expression in scar and normal tissues.
• In vitro experiments using human hypertrophic scar fibroblasts (Fbs) transfected with miR-627 mimics or inhibitors.
• Assays for cell viability, apoptosis, and protein expression (IGF-I, collagen I, α-SMA) via Western blotting and flow cytometry.
• Luciferase reporter assays to confirm the targeting of IGF-I by miR-627.

Main Results:

• miR-627 expression was significantly lower in hypertrophic scar tissue compared to normal skin.
• Upregulation of miR-627 reduced Fb viability and increased apoptosis, while inhibition had opposite effects.
• miR-627 mimic transfection decreased the expression of IGF-I, collagen I, and α-SMA.
• Luciferase assays confirmed that miR-627 directly targets IGF-I, and this targeting was abolished by IGF-I mutation.

Conclusions:

• miR-627 expression is downregulated in human hypertrophic scars.
• miR-627 inhibits fibroblast proliferation and promotes apoptosis.
• The mechanism involves the targeted inhibition of insulin-like growth factor I (IGF-I) expression.