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AAT Bioquest

What transports fatty acids around the body?

Posted October 23, 2023


Answer

Fatty acids are transported around the body via the bloodstream by binding to albumin and forming complexes. These complexes assist in the transport of fatty acids to different tissues and cells throughout the body. In addition to serum, fatty acids can be covalently bound in triacylglycerols to create the lipid core of lipoproteins including chylomicrons or low-density lipoproteins. Lipoproteins are used instead of cholesterol since those molecules are insoluble in water and would not be able to properly bind to the fatty acids. After meals, large amounts of fatty acids are transported as triglycerides to avoid toxicity. 

Fatty acid transfer proteins (FATPs) are membrane proteins which also mediate the uptake of fatty acids by cells. They are a family of six proteins which have differing roles in tissue expression and response to insulin. For example, FATP1 and FATP4 have roles in insulin resistance. FATP1 is primarily expressed in adipose tissue and skeletal muscle, while FATP4 is mainly expressed in the small intestine. Fatty acids are also transported using the citrate shuttle, transporting acetyl-CoA from the mitochondria to the cytosol for fatty acid synthesis (through CACT).

Additional resources

Fatty acid transport

Screen Quest™ Fluorimetric Fatty Acid Uptake Assay Kit