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Transport of L-arginine and the nitric oxide inhibitor NG-monomethyl-L-arginine in human erythrocytes in chronic renal failure.
Clin Sci (Lond). 1997 Jul; 93(1):57-64.CS

Abstract

1. Transport of L-arginine and the nitric oxide synthase inhibitors NG-monomethyl-L-arginine and NG-nitro-L-arginine was investigated in human erythrocytes from healthy donors and uraemic patients on haemodialysis. 2. Although K(m) values for total L-arginine influx were not significantly different in erythrocytes freshly isolated from controls or uraemic patients, uraemia was associated with an increase in the Vmax for transport (826 compared with 1176 mumol h-1 l-1 of cells) which was reduced to control values after dialysis. 3. Saturable influx of L-arginine was mediated by the classical cationic amino acid transport system y+ and system y+L, known to transport cationic and neutral amino acids with higher affinity. 4. Under zero-trans conditions, the Vmax for L-arginine transport via system y+increased from 271 to 700 mumol h-1 l-1 of cells in uraemia, while K(m) values increased from 44 to 94 mumol/l. Dialysis had no significant effect on the kinetic parameters altered by uraemia. 5. Under zero-trans conditions, and with system y+ inhibited by N-ethylmaleimide (0.2 mmol/l), transport of L-arginine via system y+L was unaffected by uraemia. 6. Saturable influx of NG-monomethyl-L-arginine was also mediated by systems y+ (K(m) = 56 mumol/l, Vmax = 353 mumol h-1 l-1 of cells) and y+L (K(m) = 17 mumol/l, Vmax = 51.3 mumol h-1 l-1 of cells) and, as with L-arginine, uraemia increased the transport capacity for NG-monomethyl-L-arginine. 7. Influx of the neutral nitric oxide synthase inhibitor NG-nitro-L-arginine was not readily saturable. 8. Intracellular concentrations of L-arginine and NG-monomethyl-L-arginine were significantly increased in erythrocytes from uraemic patients when compared with controls, consistent with an increased transport capacity for L-arginine and NG-monomethyl-L-arginine. 9. The present study provides evidence that system y+ mediates the increased transport of L-arginine and NG-monomethyl-L-arginine in human erythrocytes from patients with chronic renal failure. Our findings may have implications for the activity of the L-arginine-nitric oxide signalling pathway in vascular endothelial and smooth-muscle cells in uraemia.

Authors+Show Affiliations

University Laboratory of Physiology, Oxford, U.K.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

9279204

Citation

Mendes Ribeiro, A C., et al. "Transport of L-arginine and the Nitric Oxide Inhibitor NG-monomethyl-L-arginine in Human Erythrocytes in Chronic Renal Failure." Clinical Science (London, England : 1979), vol. 93, no. 1, 1997, pp. 57-64.
Mendes Ribeiro AC, Hanssen H, Kiessling K, et al. Transport of L-arginine and the nitric oxide inhibitor NG-monomethyl-L-arginine in human erythrocytes in chronic renal failure. Clin Sci (Lond). 1997;93(1):57-64.
Mendes Ribeiro, A. C., Hanssen, H., Kiessling, K., Roberts, N. B., Mann, G. E., & Ellory, J. C. (1997). Transport of L-arginine and the nitric oxide inhibitor NG-monomethyl-L-arginine in human erythrocytes in chronic renal failure. Clinical Science (London, England : 1979), 93(1), 57-64.
Mendes Ribeiro AC, et al. Transport of L-arginine and the Nitric Oxide Inhibitor NG-monomethyl-L-arginine in Human Erythrocytes in Chronic Renal Failure. Clin Sci (Lond). 1997;93(1):57-64. PubMed PMID: 9279204.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Transport of L-arginine and the nitric oxide inhibitor NG-monomethyl-L-arginine in human erythrocytes in chronic renal failure. AU - Mendes Ribeiro,A C, AU - Hanssen,H, AU - Kiessling,K, AU - Roberts,N B, AU - Mann,G E, AU - Ellory,J C, PY - 1997/7/1/pubmed PY - 1997/7/1/medline PY - 1997/7/1/entrez SP - 57 EP - 64 JF - Clinical science (London, England : 1979) JO - Clin Sci (Lond) VL - 93 IS - 1 N2 - 1. Transport of L-arginine and the nitric oxide synthase inhibitors NG-monomethyl-L-arginine and NG-nitro-L-arginine was investigated in human erythrocytes from healthy donors and uraemic patients on haemodialysis. 2. Although K(m) values for total L-arginine influx were not significantly different in erythrocytes freshly isolated from controls or uraemic patients, uraemia was associated with an increase in the Vmax for transport (826 compared with 1176 mumol h-1 l-1 of cells) which was reduced to control values after dialysis. 3. Saturable influx of L-arginine was mediated by the classical cationic amino acid transport system y+ and system y+L, known to transport cationic and neutral amino acids with higher affinity. 4. Under zero-trans conditions, the Vmax for L-arginine transport via system y+increased from 271 to 700 mumol h-1 l-1 of cells in uraemia, while K(m) values increased from 44 to 94 mumol/l. Dialysis had no significant effect on the kinetic parameters altered by uraemia. 5. Under zero-trans conditions, and with system y+ inhibited by N-ethylmaleimide (0.2 mmol/l), transport of L-arginine via system y+L was unaffected by uraemia. 6. Saturable influx of NG-monomethyl-L-arginine was also mediated by systems y+ (K(m) = 56 mumol/l, Vmax = 353 mumol h-1 l-1 of cells) and y+L (K(m) = 17 mumol/l, Vmax = 51.3 mumol h-1 l-1 of cells) and, as with L-arginine, uraemia increased the transport capacity for NG-monomethyl-L-arginine. 7. Influx of the neutral nitric oxide synthase inhibitor NG-nitro-L-arginine was not readily saturable. 8. Intracellular concentrations of L-arginine and NG-monomethyl-L-arginine were significantly increased in erythrocytes from uraemic patients when compared with controls, consistent with an increased transport capacity for L-arginine and NG-monomethyl-L-arginine. 9. The present study provides evidence that system y+ mediates the increased transport of L-arginine and NG-monomethyl-L-arginine in human erythrocytes from patients with chronic renal failure. Our findings may have implications for the activity of the L-arginine-nitric oxide signalling pathway in vascular endothelial and smooth-muscle cells in uraemia. SN - 0143-5221 UR - https://www.unboundmedicine.com/medline/citation/9279204/Transport_of_L_arginine_and_the_nitric_oxide_inhibitor_NG_monomethyl_L_arginine_in_human_erythrocytes_in_chronic_renal_failure_ L2 - https://portlandpress.com/clinsci/article-lookup/doi/10.1042/cs0930057 DB - PRIME DP - Unbound Medicine ER -