Linoleoyl-L-carnitine is a naturally occurring long-chain acylcarnitine. Hepatic levels of linoleoyl-L-carnitine are increased following high-dose (200 mg kg) administration of isoniazid in mice.
Hexanoyl-L-carnitine is a medium-chain acylcarnitine. It has been used in the synthesis of acylcarnitine benzyl esters.1 1.Gong, X.-w., Li, J.-p., Wu, J.-f., et al.Synthesis of carnitine benzyl esters as prodrugsJ. Chem. Res.2008(6)327-330(2008)
Valeryl-L-carnitine is a short-chain acylcarnitine and a derivative of L-carnitine . Valeryl-L-carnitine levels increase in the serum of rhesus monkeys following exposure to 7 and 10 Gray units (Gy) of ionizing radiation.[1]
Decanoyl-L-carnitine is an ester derivative of L-carnitine . It increases the formation of C24 fatty acid intermediates, as well as docosapentaenoic and docosahexaenoic acid in rat hepatocytes.
Carnitine facilitates the transport of fatty acids into the mitochondria to be used in fatty acid metabolism. It does so by accepting acyl groups from fatty acids complexed with coenzyme A, which yields esterified carnitine or acylcarnitines that enable the transport of fatty acyl groups into the inner mitochondrial matrix. β-Oxidation of fatty acids in mitochondria is inhibited by uncoupling conditions, thus changes in circulating levels of various acylcarnitines have been used to identify alterations in metabolic state.[1] [2] Arachidonoyl-L-carnitine formed from carnitine conjugated to arachidonic acid .
Butyryl-L-carnitine is a butyrate ester of carnitine. It is an inhibitor of intestinal transporters, blocking carnitine uptake by the carnitine transporter and glycine transport by the amino acid transporter in human retinal pigment epithelial (HRPE) cells (IC50s = 1.5 μM and 4.6 mM, respectively).
Isovaleryl-L-carnitine is a naturally occurring acylcarnitine that is formed via metabolic conversion of L-leucine. It increases survival and decreases apoptosis in hepatocyte growth factor-deprived murine C2.8 hepatocytes when used at a concentration of 1 mM. Isovaleryl-L-carnitine inhibits amino acid deprivation-induced proteolysis and autophagy in isolated perfused rat liver when used at concentrations of 77 and 100 μM, respectively. Increased levels of isovaleryl carnitine are associated with isovaleryl-CoA dehydrogenase deficiency (isovaleric acidemia).