MicroRNA-133a Inhibits Proliferation of Gastric Cancer Cells by Downregulating ERBB2 Expression

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Updated: Feb 9, 2026

In Vivo Inhibition of MicroRNA to Decrease Tumor Growth in Mice
07:02

In Vivo Inhibition of MicroRNA to Decrease Tumor Growth in Mice

Published on: August 23, 2019

7.8K

Chang Li, Xiaoping Li, Shuohui Gao

    Oncology Research
    |January 22, 2017
    PubMed

    Insights

    MicroRNA-133a (miR-133a) inhibits gastric cancer cell growth by targeting ERBB2. This finding suggests miR-133a as a potential therapeutic target for gastric cancer treatment.

    Area of Science:

    • Oncology
    • Molecular Biology
    • Biochemistry

    Background:

    • Gastric cancer is a leading cause of cancer deaths globally.
    • MicroRNA-133a (miR-133a) has been implicated in gastric cancer development.
    • The precise molecular mechanisms of miR-133a's role in gastric cancer require further elucidation.

    Purpose of the Study:

    • To investigate the molecular mechanisms underlying miR-133a's inhibition of gastric cancer cell proliferation.
    • To identify direct molecular targets of miR-133a in gastric cancer cells.
    • To explore the potential of miR-133a as a therapeutic agent for gastric cancer.

    Main Methods:

    • MTT assay to analyze cell proliferation in SNU-1 gastric cancer cells.
    • Flow cytometry to assess apoptosis.
    • Western blot analysis to measure protein expression levels of ERBB2, p-ERK1/2, and p-AKT.
    • Luciferase reporter assay to confirm ERBB2 as a direct target of miR-133a.

    Main Results:

    • Overexpression of miR-133a significantly inhibited SNU-1 cell proliferation and induced apoptosis.
    • ERBB2 was identified as a direct target of miR-133a, with its expression being negatively regulated.
    • Silencing ERBB2 mimicked the effects of miR-133a overexpression, inducing apoptosis and inhibiting ERK and AKT activation.

    Conclusions:

    • miR-133a suppresses gastric cancer cell proliferation by downregulating ERBB2 expression and its downstream signaling pathways (p-ERK1/2, p-AKT).
    • ERBB2 acts as a direct molecular target mediating the tumor-suppressive effects of miR-133a.
    • miR-133a presents a promising therapeutic target for gastric cancer treatment.

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