Accumulation of the endogenous L-arginine analogue NG-monomethyl-L-arginine in human end-stage renal failure patients on regular haemodialysis.

Abstract:

:We measured plasma levels of L-arginine, its analogue NG-monomethyl-L-arginine (L-NMMA), and related amino acids in normal subjects and uraemic patients (n = 31), before and after haemodialysis. Plasma levels of L-arginine were reduced to less than half of normal values in uraemic subjects compared with controls, and were not affected by haemodialysis. L-NMMA was not detectable in non-uraemic subjects, but markedly elevated in uraemic patients. In parallel, we used human red blood cells as a model to study the effect of L-NMMA upon the transport of L-arginine. L-NMMA trans-stimulated L-arginine transport significantly, confirming that L-arginine and L-NMMA share common transport pathways. Our results suggest altered L-arginine metabolism and the presence of an increased concentration of a NO synthase inhibitor in uraemia. We propose that alterations in plasma L-arginine levels and increased production of L-arginine analogues will alter NO synthesis and may help to explain some pathological changes seen in uraemia.

journal_name

Exp Physiol

journal_title

Experimental physiology

authors

Mendes Ribeiro AC,Roberts NB,Lane C,Yaqoob M,Ellory JC

doi

10.1113/expphysiol.1996.sp003950

subject

Has Abstract

pub_date

1996-05-01 00:00:00

pages

475-81

issue

3

eissn

0958-0670

issn

1469-445X

journal_volume

81

pub_type

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