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Related Experiment Video

Updated: Oct 17, 2025

In Vitro Cultivation Techniques for Modeling Liver Organogenesis, Building Assembloids, and Designing Synthetic Tissues using Human Cell Lines

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Published on: April 18, 2025

Mir-21 Suppression Promotes Mouse Hepatocarcinogenesis.

Marta Correia de Sousa¹, Nicolas Calo¹, Cyril Sobolewski¹

¹Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland.

|October 13, 2021

Summary

This summary is machine-generated.

MicroRNA 21 (miR-21) deficiency, contrary to expectations, promotes hepatocellular carcinoma (HCC) development in mice. Loss of miR-21 creates a pro-tumoral environment, challenging its role as a liver oncogene.

Keywords:

HCC PTEN fibrosis immune cells inflammation microRNA 21 oncogenes tumor suppressors

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In Vivo Inhibition of MicroRNA to Decrease Tumor Growth in Mice

In Vivo Inhibition of MicroRNA to Decrease Tumor Growth in Mice

Published on: August 23, 2019

Area of Science:

Oncology
Molecular Biology
Hepatology

Background:

MicroRNA 21 (miR-21) is upregulated in many cancers and considered an oncogene.
Its role in driving liver cancer (hepatocellular carcinoma, HCC) in vivo is not well understood.
Previous studies suggest miR-21 promotes liver steatosis and inflammation.

Purpose of the Study:

To investigate the in vivo role of miR-21 in hepatocarcinogenesis.
To determine if miR-21 deficiency promotes or inhibits liver tumor development.

Main Methods:

Used diethylnitrosamine (DEN)-induced and PTEN-deficient mouse models of HCC.
Generated mice with total or hepatocyte-specific genetic deletion of miR-21.
Performed gene and protein expression analyses on liver tissues.

Main Results:

miR-21 deficiency, in both models, fostered HCC development, contradicting its expected oncogenic role.
Lack of miR-21 increased expression of oncogenes like Cdc25a.
Observed subtle pathway deregulations (MAPK, HiPPO, STAT3) and altered anti-tumoral immune responses.

Conclusions:

miR-21 deficiency promotes a pro-tumoral microenvironment, leading to HCC development through complex mechanisms.
These findings challenge the established view of miR-21 as a potent oncomiR in the liver.
Caution is advised when considering miR-21 inhibition as a therapeutic strategy for HCC.