Generation and Validation of miR-100 Hepatocyte-Specific Knock-Out Mice

Area of Science:

• Molecular Biology
• Oncology
• Genetics

Background:

• MicroRNA-100 (miR-100) inactivation is linked to hepatocellular carcinoma (HCC).
• miR-100 functions as a tumor suppressor, making its role in HCC genesis crucial to investigate.
• Understanding miR-100's function in HCC development requires an appropriate in vivo model.

Purpose of the Study:

• To develop and characterize a mouse model with hepatocyte-specific miR-100 deficiency.
• To investigate the in vivo role of miR-100 in hepatocellular carcinoma (HCC) development.
• To analyze the effects of miR-100 knockout on liver function, metabolism, and gene expression in mice.

Main Methods:

• Generation of miR-100flox/flox Alb-Cre+ mice for hepatocyte-specific knockout.
• Genotyping, qRT-PCR, and Western blot for genetic and molecular validation.
• Histological analysis (HE staining), liver function tests (transaminase activity), and metabolic profiling (Seahorse analyzer).

Main Results:

• Successfully generated miR-100 knockout mice with an 80% reduction in hepatic miR-100 expression.
• Aged miR-100 knockout mice exhibited inflammatory cell infiltration, hepatocellular nuclear expansion, and impaired liver function (elevated AST/ALT).
• Knockout hepatocytes showed a shift towards glycolysis, with increased expression of miR-100 targets (IGF1R-β, mTOR, CDC25A) and HCC-related protein SHP-2.

Conclusions:

• A functional mouse model for hepatocyte-specific miR-100 deficiency was successfully created.
• The model recapitulates malignant transformation relevant to HCC in aged mice.
• This model is valuable for studying the mechanisms by which miR-100 inactivation contributes to HCC in vivo.