Differences in Fatty Acid Metabolism between MCDD and HFD Induced Metabolic Dysfunction-associated Fatty Liver...

Area of Science:

• Hepatology
• Metabolic Diseases
• Animal Models

Background:

• Metabolic dysfunction-associated fatty liver disease (MAFLD) incidence is rising globally, posing a significant public health challenge.
• MAFLD is commonly linked to obesity, hyperlipemia, and metabolic syndrome.
• Dietary induction is a primary method for creating MAFLD animal models, with notable phenotypic variations between methionine-choline-deficient diet (MCDD) and high-fat diet (HFD) models.

Purpose of the Study:

• To investigate the distinct hepatic fatty acid metabolic pathways in MCDD-induced versus HFD-induced MAFLD models.
• To elucidate the molecular mechanisms underlying phenotypic differences in these MAFLD models.

Main Methods:

• Analysis of serum and liver tissue from established MCDD and HFD induced MAFLD animal models.
• Comparative assessment of hepatic fatty acid transport, uptake, and efflux protein and mRNA expression.

Main Results:

• Both MCDD and HFD models exhibited liver fat accumulation and functional damage.
• MCDD model showed increased fatty acid transport protein expression, decreased efflux protein/mRNA, and lower blood lipids.
• HFD model demonstrated increased fatty acid uptake, efflux protein, and efflux mRNA expression, alongside elevated blood lipids.

Conclusions:

• Impaired fatty acid oxidation and enhanced hepatic fatty acid uptake are central to both MAFLD models.
• Divergent regulation of de novo lipogenesis and fatty acid efflux contributes to the phenotypic disparities between MCDD and HFD models.