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miR-136 modulates TGF-β1-induced proliferation arrest by targeting PPP2R2A in keratinocytes

Dianbao Zhang1, Jing Wang2, Zhe Wang3

  • 1Department of Stem Cells and Regenerative Medicine, Key Laboratory of Cell Biology, Ministry of Public Health and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang 110001, China.

Biomed Research International
|February 6, 2015
PubMed

Insights

MicroRNA-136 (miR-136) levels decrease in keratinocytes treated with TGF-β1, impacting cell proliferation. Restoring miR-136 or silencing PPP2R2A counteracts this arrest, suggesting a role in wound healing.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Dermatology

Background:

  • Keratinocyte proliferation is essential for wound healing.
  • Dysregulation of microRNAs (miRNAs) is implicated in keratinocyte proliferation.
  • The precise molecular mechanisms underlying these processes require further elucidation.

Purpose of the Study:

  • To investigate the role of miR-136 in TGF-β1-induced keratinocyte proliferation arrest.
  • To identify the molecular targets and pathways involved in miR-136 regulation.
  • To explore the potential of miR-136 as a therapeutic target for skin wound healing.

Main Methods:

  • Treatment of HaCaT cells and normal human epidermal keratinocytes (NHEK) with TGF-β1.
  • Quantitative real-time PCR to measure miR-136 levels.
  • Cell proliferation assays and cell cycle analysis.
  • Transfection with miR-136 mimics or small interfering RNAs (siRNAs) targeting PPP2R2A.
  • Dual-luciferase reporter assays and Western blotting to validate PPP2R2A as a direct target of miR-136.

Main Results:

  • TGF-β1 treatment significantly decreased miR-136 levels in a Smad3-dependent manner.
  • Reintroduction of miR-136 or silencing of PPP2R2A counteracted TGF-β1-induced proliferation arrest in HaCaT cells.
  • PPP2R2A was confirmed as a direct target of miR-136.

Conclusions:

  • miR-136 plays a crucial role in regulating TGF-β1-induced proliferation arrest in keratinocytes.
  • The miR-136/PPP2R2A axis is a key pathway involved in keratinocyte proliferation.
  • Targeting miR-136 may offer a novel therapeutic strategy for enhancing skin wound healing.

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