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Urinary NO3- excretion as an indicator of nitric oxide formation in vivo during oral administration of L-arginine or L-name in rats.
Clin Exp Pharmacol Physiol. 1996 Jan; 23(1):11-5.CE

Abstract

1. Endothelium-derived nitric oxide (NO), a major modulator of vascular tone, is synthesized from the terminal guanidino nitrogen of L-arginine. This reaction is inhibited by analogues of L-arginine, such as N-nitro-L-arginine methyl ester (L-NAME). Many of the biological effects of NO are mediated by the second messenger cGMP. NO is rapidly oxidized to NO3-, which, like cGMP, is eliminated via excretion into the urine. In a placebo controlled study, we investigated whether oral bolus administration of L-arginine and L-NAME affects the urinary excretion rates of NO3- and cGMP in Munich Wistar Frommter (MWF) rats. 2. Twenty MWF rats were kept in metabolic cages and received L-arginine (3 g/kg bodyweight), L-NAME (50 mg/kg), or placebo (0.9% saline) in randomized order. Urine samples were sequentially collected for 10 h and analysed for creatinine, NO3- and cGMP. 3. L-Arginine inducted a slight, but prolonged increase in urine flow, whereas L-NAME induced an early, transient increase in urine flow which was followed by a decrease. Creatinine clearance decreased by 65% after L-NAME, but was not affected by L-arginine or placebo. 4. Urinary NO3- and cGMP excretion rates transiently increased after L-arginine (NO3-: + 29%; cGMP: +16%) for 4-5 h, whereas L-NAME induced an immediate, pronounced and lasting inhibition of urinary NO3- and cGMP excretion (NO3-: -76%; cGMP: -46%). Urinary NO3- and cGMP excretions were significantly correlated (r = 0.755; P < 0.001). 5. Urinary excretion rates of NO3- and cGMP, expressed as mu mol/h, were correlated to urine flow (mL/h; r = 0.617 and 0.649, respectively; both P < 0.05), whereas after correction by urinary creatinine (mu mol/mmol creatinine) no correlation with urine flow was observed, indicating that these excretion rates were independent of renal excretory function. Thus we conclude that changes in the urinary excretion rates of NO3- and cGMP represent changes in NO production rates in vivo when expressed in relation to urinary creatinine. Urinary NO3- and cGMP excretion is modulated by acute NO synthase inhibition or substrate provision.

Authors+Show Affiliations

Institute of Clinical Pharmacology, Hannover Medical School, Germany.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

8713490

Citation

Boger, R H., et al. "Urinary NO3- Excretion as an Indicator of Nitric Oxide Formation in Vivo During Oral Administration of L-arginine or L-name in Rats." Clinical and Experimental Pharmacology & Physiology, vol. 23, no. 1, 1996, pp. 11-5.
Boger RH, Bode-Boger SM, Gerecke U, et al. Urinary NO3- excretion as an indicator of nitric oxide formation in vivo during oral administration of L-arginine or L-name in rats. Clin Exp Pharmacol Physiol. 1996;23(1):11-5.
Boger, R. H., Bode-Boger, S. M., Gerecke, U., Gutzki, F. M., Tsikas, D., & Frolich, J. C. (1996). Urinary NO3- excretion as an indicator of nitric oxide formation in vivo during oral administration of L-arginine or L-name in rats. Clinical and Experimental Pharmacology & Physiology, 23(1), 11-5.
Boger RH, et al. Urinary NO3- Excretion as an Indicator of Nitric Oxide Formation in Vivo During Oral Administration of L-arginine or L-name in Rats. Clin Exp Pharmacol Physiol. 1996;23(1):11-5. PubMed PMID: 8713490.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Urinary NO3- excretion as an indicator of nitric oxide formation in vivo during oral administration of L-arginine or L-name in rats. AU - Boger,R H, AU - Bode-Boger,S M, AU - Gerecke,U, AU - Gutzki,F M, AU - Tsikas,D, AU - Frolich,J C, PY - 1996/1/1/pubmed PY - 1996/1/1/medline PY - 1996/1/1/entrez SP - 11 EP - 5 JF - Clinical and experimental pharmacology & physiology JO - Clin. Exp. Pharmacol. Physiol. VL - 23 IS - 1 N2 - 1. Endothelium-derived nitric oxide (NO), a major modulator of vascular tone, is synthesized from the terminal guanidino nitrogen of L-arginine. This reaction is inhibited by analogues of L-arginine, such as N-nitro-L-arginine methyl ester (L-NAME). Many of the biological effects of NO are mediated by the second messenger cGMP. NO is rapidly oxidized to NO3-, which, like cGMP, is eliminated via excretion into the urine. In a placebo controlled study, we investigated whether oral bolus administration of L-arginine and L-NAME affects the urinary excretion rates of NO3- and cGMP in Munich Wistar Frommter (MWF) rats. 2. Twenty MWF rats were kept in metabolic cages and received L-arginine (3 g/kg bodyweight), L-NAME (50 mg/kg), or placebo (0.9% saline) in randomized order. Urine samples were sequentially collected for 10 h and analysed for creatinine, NO3- and cGMP. 3. L-Arginine inducted a slight, but prolonged increase in urine flow, whereas L-NAME induced an early, transient increase in urine flow which was followed by a decrease. Creatinine clearance decreased by 65% after L-NAME, but was not affected by L-arginine or placebo. 4. Urinary NO3- and cGMP excretion rates transiently increased after L-arginine (NO3-: + 29%; cGMP: +16%) for 4-5 h, whereas L-NAME induced an immediate, pronounced and lasting inhibition of urinary NO3- and cGMP excretion (NO3-: -76%; cGMP: -46%). Urinary NO3- and cGMP excretions were significantly correlated (r = 0.755; P < 0.001). 5. Urinary excretion rates of NO3- and cGMP, expressed as mu mol/h, were correlated to urine flow (mL/h; r = 0.617 and 0.649, respectively; both P < 0.05), whereas after correction by urinary creatinine (mu mol/mmol creatinine) no correlation with urine flow was observed, indicating that these excretion rates were independent of renal excretory function. Thus we conclude that changes in the urinary excretion rates of NO3- and cGMP represent changes in NO production rates in vivo when expressed in relation to urinary creatinine. Urinary NO3- and cGMP excretion is modulated by acute NO synthase inhibition or substrate provision. SN - 0305-1870 UR - https://www.unboundmedicine.com/medline/citation/8713490/Urinary_NO3__excretion_as_an_indicator_of_nitric_oxide_formation_in_vivo_during_oral_administration_of_L_arginine_or_L_name_in_rats_ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&amp;sid=nlm:pubmed&amp;issn=0305-1870&amp;date=1996&amp;volume=23&amp;issue=1&amp;spage=11 DB - PRIME DP - Unbound Medicine ER -