Hepatic beta-oxidation enzymes (Hepatic FAO enzymes)

Hepatic beta-oxidation enzymes are a group of mitochondrial and peroxisomal proteins responsible for the sequential breakdown of fatty acids into acetyl-CoA, a process essential for energy production and ketogenesis in the liver (StatPearls: Fatty Acid Oxidation, 2023). Key enzymes in this pathway include carnitine palmitoyltransferase 1A (CPT1A), which facilitates the entry of long-chain fatty acids into the mitochondria, and various acyl-CoA dehydrogenases such as Medium-chain acyl-CoA dehydrogenase (MCAD) and Very long-chain acyl-CoA dehydrogenase (VLCAD) (UniProt: CPT1A, 2024). In the liver, these enzymes are primarily regulated by the transcription factor peroxisome proliferator-activated receptor alpha (PPAR-alpha), which induces their expression in response to fasting or high lipid loads. Dysregulation of these enzymes is a central feature of metabolic dysfunction-associated steatotic liver disease (MASLD) and non-alcoholic steatohepatitis (NASH), where impaired beta-oxidation contributes to hepatic steatosis and lipotoxicity (Journal of Hepatology: PPAR agonists in NASH, 2021). Therapeutic strategies often target these enzymes indirectly through PPAR agonists, such as fibrates and newer agents like elafibranor, to enhance fatty acid clearance and reduce liver fat content. Conversely, genetic deficiencies in specific enzymes of this pathway lead to fatty acid oxidation disorders (FAODs), which are characterized by life-threatening metabolic crises (NIH: Fatty Acid Oxidation Disorders, 2022).

Other names

Fatty acid beta-oxidation enzymesMitochondrial beta-oxidation enzymesHepatic FAO enzymesLiver beta-oxidation system

Upregulation of enzyme expression via activation of peroxisome proliferator-activated receptors (PPAR-alpha and PPAR-delta) to enhance hepatic fatty acid catabolism.