Fatty acid metabolism

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Fatty acid metabolism

Fatty acid metabolism involves the synthesis and degradation of fatty acids and their derivatives. Fatty acids are a key energy source for the human body, particularly the heart and skeletal muscle during prolonged periods of fasting or strenuous exercise. They are also important for cell membrane structure and function, as well as for the production of bioactive molecules.

Overview

Fatty acids are primarily derived from dietary lipids, which are absorbed in the intestine and transported to other tissues via the bloodstream. They can also be synthesized in the body from other substrates, such as carbohydrates and amino acids, through a process known as lipogenesis.

Fatty Acid Synthesis

Fatty acid synthesis occurs in the cytoplasm of cells and is catalyzed by a series of enzymes known as the fatty acid synthase complex. The process begins with the carboxylation of acetyl-CoA to form malonyl-CoA, a reaction that is catalyzed by the enzyme acetyl-CoA carboxylase. This is followed by a series of condensation, reduction, dehydration, and reduction reactions to form a long-chain fatty acid.

Fatty Acid Oxidation

Fatty acid oxidation, also known as beta-oxidation, occurs in the mitochondria of cells and involves the sequential removal of two-carbon units from the carboxyl end of a fatty acid chain. This process generates acetyl-CoA, which can enter the citric acid cycle to produce energy.

Regulation of Fatty Acid Metabolism

The regulation of fatty acid metabolism is complex and involves a number of hormones, including insulin, glucagon, and epinephrine. Insulin promotes fatty acid synthesis, while glucagon and epinephrine stimulate fatty acid oxidation.

Disorders of Fatty Acid Metabolism

Disorders of fatty acid metabolism can lead to a variety of clinical conditions, including obesity, diabetes, and cardiovascular disease. In addition, certain genetic disorders, such as medium-chain acyl-CoA dehydrogenase deficiency, can impair fatty acid oxidation and lead to serious metabolic disturbances.

See Also

• Lipid metabolism
• Carbohydrate metabolism
• Protein metabolism