miR-181a Promotes Multiple Protumorigenic Functions by Targeting TGFβR3.

Area of Science:

• Oncology
• Molecular Biology
• Dermatology

Background:

• Cutaneous squamous cell carcinoma (cSCC) is a common skin cancer with a known progression pathway.
• Identifying molecular targets for chemoprevention is crucial for managing cSCC.
• Previous research identified miR-181a as a potential oncomiR in cSCC development.

Purpose of the Study:

• To investigate the role of miR-181a in cSCC pathogenesis.
• To identify the molecular targets of miR-181a in cSCC.
• To evaluate miR-181a as a potential target for cSCC chemoprevention.

Main Methods:

• Analysis of miR-181a and TGFβR3 expression in cSCC.
• In vitro studies using keratinocytes to assess apoptosis, survival, migration, and invasion.
• Luciferase reporter assays to confirm direct targeting of TGFβR3 by miR-181a.
• In vivo studies to assess the effect of miR-181a inhibition on tumor growth.

Main Results:

• miR-181a is upregulated and TGFβR3 is downregulated in cSCC.
• miR-181a overexpression (OE) and TGFβR3 knockdown (KD) promote protumorigenic properties, including suppressed apoptosis and enhanced survival, migration, and invasion.
• miR-181a directly targets TGFβR3, influencing TGFβ signaling pathways (SMAD3, SNAIL, SLUG).
• Inhibition of miR-181a in vivo compromises tumor growth.

Conclusions:

• miR-181a acts as an oncomiR in cSCC by targeting TGFβR3.
• The miR-181a/TGFβR3 axis plays a significant role in cSCC development.
• Targeting miR-181a represents a promising therapeutic strategy for cSCC chemoprevention.