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Cellular ADMA: Regulation and action

Open access
Teerlink, Tom, Luo, Zaiming, Palm, Fredrik, Wilcox, Christopher S.·2009·Pharmacological Research

Abstract

Asymmetric (NG,NG) dimethylarginine (ADMA) is present in plasma and cells. It can inhibit nitric oxide synthase (NOS) that generates nitric oxide (NO) and cationic amino acid transporters (CAT) that supply intracellular NOS with its substrate, L-arginine from the plasma. Therefore, ADMA and its transport mechanisms are strategically placed to regulate endothelial function. This could have considerable clinical impact since endothelial dysfunction has been detected at the origin of hypertension and chronic kidney disease (CKD) in human subjects and may be a harbinger of large vessel disease and cardiovascular disease (CVD). Indeed, plasma levels of ADMA are increased in many studies of patients at risk for, or with overt CKD or CVD. However, the levels of ADMA measured in plasma of about 0.5 μmol · l−1 maybe below those required to inhibit NOS whose substrate, L-arginine, is present in concentrations manifold above the Km for NOS. However, NOS activity may be partially inhibited by cellular ADMA. Therefore, the cellular production of ADMA by protein arginine methyltransferase (PRMT) and protein hydrolysis, its degradation by NG, NG-dimethylarginine dimethylaminohydrolase (DDAH) and its transmembrane transport by CAT that determines intracellular levels of ADMA may also determine the state of activation of NOS. This is the focus of the review. It is concluded that cellular levels of ADMA can be 5- to 20-fold those in plasma and in a range that could tonically inhibit NOS. The relative importance of PRMT, DDAH and CAT for determining the intracellular NOS substrate: inhibitor ratio (L-arginine:ADMA) may vary according to the pathophysiologic circumstance. An understanding of this important balance requires knowledge of at least these three processes that regulate the intracellular levels of ADMA and arginine.

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Metadata

Authors
Teerlink, T., Luo, Z., Palm, F., & Wilcox, C. S.
Venue
Pharmacological Research
Publisher
Elsevier BV
Published
2009-12
Volume
60
Issue
6
Pages
448-460
ISSN
1043-6618 (ISSN-L)
OpenAlex
W2063382200
Cited by
342
References
143
FWCI
11.81
Type
journal article
Language
en
Open access
green

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Teerlink, T., Luo, Z., Palm, F., & Wilcox, C. S. (2009). Cellular ADMA: Regulation and action. Pharmacological Research. https://doi.org/10.1016/j.phrs.2009.08.002

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