MicroRNA-132 enhances transition from inflammation to proliferation during wound healing

Area of Science:

• Molecular Biology
• Dermatology
• Wound Healing Research

Background:

• Wound healing involves distinct inflammatory and proliferative phases.
• The molecular mechanisms governing the transition between these phases are not fully elucidated.
• MicroRNAs (miRNAs) are emerging as key regulators in biological processes, including tissue repair.

Purpose of the Study:

• To investigate the role of microRNAs (miRNAs) in human skin wound healing.
• To characterize the dynamic changes in the miRNome during the wound healing process.
• To determine the specific function of miR-132 in regulating the transition from inflammation to proliferation.

Main Methods:

• Profiling of microRNA expression in human skin wounds.
• In vitro studies using keratinocytes stimulated with TGF-β1 and TGF-β2.
• Transcriptome analysis to identify miR-132 targets.
• Inhibition of miR-132 in mouse and human ex vivo wound models.

Main Results:

• miR-132 expression is upregulated during wound inflammation, peaking in the proliferative phase.
• miR-132 suppresses leukocyte attraction via the NF-κB pathway but promotes keratinocyte proliferation via STAT3 and ERK pathways.
• HB-EGF was identified as a functional target of miR-132.
• Blocking miR-132 in wound models resulted in delayed healing, persistent inflammation, and impaired keratinocyte proliferation.

Conclusions:

• miR-132 is a critical regulator of skin wound healing.
• miR-132 facilitates the transition from the inflammatory to the proliferative phase.
• Targeting miR-132 presents a potential therapeutic strategy for enhancing wound repair.