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Carnitine transport by organic cation transporters and systemic carnitine deficiency.

Abstract：

:The intracellular homeostasis is controlled by different membrane transporters. Organic cation transporters function primarily in the elimination of cationic drugs, endogenous amines, and other xenobiotics in tissues such as the kidney, intestine, and liver. Among these molecules, carnitine is an endogenous amine which is an essential cofactor for mitochondrial beta-oxidation. Recently, a new family of transporters, named OCT (organic cation transporters) has been described. In this minireview, we present the recent knowledge about OCT and focus on carnitine transport, more particularly by the OCTN2. The importance of this sodium-dependent carnitine cotransporter, OCTN2, comes from various recently reported mutations in the gene which give rise to the primary systemic carnitine deficiency (SCD; OMIM 212140). The SCD is an autosomal recessive disorder of fatty acid oxidation characterized by skeletal myopathy, progressive cardiomyopathy, hypoglycemia and hyperammonemia. Most of the OCTN2 mutations identified in humans with SCD result in loss of carnitine transport function. Identifying these mutations will allow an easy targeting of the SCD syndrome. The characteristics of the juvenile visceral steatosis (jvs) mouse, an animal model of SCD showing similar symptoms as humans having this genetic disorder, are also described. These mice have a mutation in the gene encoding the mouse carnitine transporter octn2. Although various OCTN carnitine transporters have been identified and functionally characterized, their membrane localization and regulation are still unknown and must be investigated. This knowledge will also help in designing new drugs that regulate carnitine transport activity.

journal_name

Mol Genet Metab

journal_title

Molecular genetics and metabolism

authors

Lahjouji K,Mitchell GA,Qureshi IA

doi

10.1006/mgme.2001.3207

subject

Has Abstract

pub_date

2001-08-01 00:00:00

pages

287-97

issue

4

eissn

1096-7192

issn

1096-7206

pii

S1096-7192(01)93207-X

journal_volume

73

pub_type

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