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MicroRNA-340 inhibits squamous cell carcinoma cell proliferation, migration and invasion by downregulating RhoA

Huina Wang1, Weinan Guo1, Qiang Jian1

  • 1Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, China.

Journal of Dermatological Science
|September 29, 2018
PubMed
Abstract

Insights

MicroRNA-340 (miR-340) acts as a tumor suppressor in squamous cell carcinoma (SCC) by inhibiting cell proliferation, migration, and invasion. This study identifies RhoA as a direct target, suggesting miR-340 restoration as a potential SCC therapy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • MicroRNAs (miRNAs) are crucial in tumor progression and metastasis, particularly in squamous cell carcinoma (SCC).
  • Dysregulated miR-340 expression is implicated in the development of various cancers, including SCC.

Purpose of the Study:

  • To elucidate the role and underlying mechanism of miR-340 in SCC cell proliferation, migration, and invasion.
  • To identify the direct molecular targets of miR-340 in SCC.

Main Methods:

  • Quantitative real-time PCR to assess miR-340 expression in SCC tissues and cell lines.
  • In vitro assays (Cell Counting Kit-8, wound healing, transwell) to evaluate miR-340's functional impact.
  • Bioinformatics, luciferase reporter assays, western blotting, and immunohistochemistry to identify and validate miR-340 targets.

Main Results:

  • miR-340 expression was significantly downregulated in SCC tissues and cell lines.
  • Overexpression of miR-340 suppressed SCC cell proliferation, migration, and invasion; conversely, inhibition promoted these processes.
  • RhoA was identified as a direct target of miR-340, and its knockdown reversed the effects of miR-340 inhibition.
  • A negative correlation was observed between RhoA and miR-340 expression in SCC tissues.

Conclusions:

  • miR-340 functions as a tumor suppressor in SCC by directly targeting RhoA.
  • Restoring miR-340 expression presents a potential therapeutic strategy for SCC treatment.
Keywords:
InvasionProliferationRhoASquamous cell carcinomamiR-340

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