Fatty acid transport and mitochondrial energy metabolism

Fatty acid transport and mitochondrial energy metabolism refers to the integrated physiological process of cellular lipid utilization for ATP production. This pathway begins with the uptake of long-chain fatty acids by transporters such as CD36, followed by their activation and carnitine-mediated transport into the mitochondria, a rate-limiting step governed by carnitine palmitoyltransferase 1 (CPT1) (Lopaschuk et al., 2010, Physiological Reviews). Once inside the mitochondrial matrix, fatty acids undergo beta-oxidation to produce acetyl-CoA, which fuels the tricarboxylic acid (TCA) cycle and oxidative phosphorylation (Houten & Wanders, 2010, Journal of Inherited Metabolic Disease). This metabolic route is essential for high-energy demanding tissues like the heart and skeletal muscle, but its dysregulation is a primary driver in the pathogenesis of insulin resistance, type 2 diabetes, and non-alcoholic fatty liver disease (NAFLD) (Glatz et al., 2010, Molecular and Cellular Biochemistry). Pharmacological agents often target specific nodes of this process, such as CPT1 inhibitors (e.g., etomoxir) to reduce fatty acid oxidation in favor of more oxygen-efficient glucose utilization, or PPAR agonists to enhance overall lipid clearance and metabolic flexibility (Schwenk et al., 2010, Adipocyte).

Other names

Fatty acid beta-oxidationMitochondrial fatty acid oxidationFAO pathwayLipid metabolismMitochondrial energy metabolism

Modulation of fatty acid uptake via transporters, inhibition of mitochondrial entry through CPT1, or transcriptional regulation of metabolic enzymes via PPAR activation to shift energy substrate preference.