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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

Inhibition of autophagy and tumor growth in colon cancer by miR-502

H Zhai1, B Song, X Xu

  • 1Department of Pathology, Translational Research Laboratory, Stony Brook University, Stony Brook, NY 11794-8691, USA.

Oncogene
|May 15, 2012
PubMed

Insights

MicroRNA-502 (miR-502) suppresses autophagy and colon cancer growth by targeting Rab1B. This microRNA is downregulated in colon cancer patients, suggesting it acts as a tumor suppressor.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Background:

  • Autophagy is a cellular process for macromolecule breakdown and recycling.
  • The role of non-coding microRNAs in colon cancer-associated autophagy remains largely unexplored.
  • Rab1B is identified as a key mediator in autophagy pathways.

Purpose of the Study:

  • To investigate the novel mechanism of autophagy regulation by hsa-miR-502-5p (miR-502) in colon cancer.
  • To identify miR-502-suppressed mRNA targets and their role in colon cancer.
  • To evaluate the therapeutic potential of miR-502 in colon cancer models.

Main Methods:

  • Microarray analysis to identify miR-502-suppressed mRNA targets.
  • In vitro studies to assess the effects of ectopic miR-502 expression on colon cancer cells.
  • In vivo mouse tumor xenograft models to evaluate miR-502's impact on tumor growth.
  • Analysis of p53-mediated regulation of miR-502 expression.

Main Results:

  • Ectopic miR-502 expression inhibited autophagy, colon cancer cell proliferation, and cell-cycle progression in vitro.
  • miR-502 suppressed tumor growth in a mouse xenograft model.
  • Microarray analysis identified Rab1B and dihydroorotate dehydrogenase as miR-502 targets.
  • p53 was found to regulate miR-502 expression via negative feedback.
  • miR-502 expression was significantly downregulated in colon cancer patient samples.

Conclusions:

  • miR-502 acts as a novel regulator of autophagy by suppressing Rab1B.
  • miR-502 demonstrates tumor-suppressive properties in colon cancer, inhibiting cell growth and progression.
  • Downregulation of miR-502 in patient samples suggests its potential role as a biomarker.
  • miR-502 represents a promising candidate for developing novel therapeutic strategies against colon cancer.

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