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. 1994 May;112(1):65–70. doi: 10.1111/j.1476-5381.1994.tb13030.x

Regulation of baseline vascular resistance in the canine diaphragm by nitric oxide.

M E Ward 1, S N Hussain 1
PMCID: PMC1910274  PMID: 8032663

Abstract

1. The role played by nitric oxide (NO) in the regulation of blood flow to the canine isolated hemidiaphragm was evaluated by determining (a) the effects of the L-arginine analogues NG-nitro-L-arginine methyl ester (L-NAME), NG-nitro-L-arginine (L-NOARG), and argininosuccinic acid (ArgSA) on baseline vascular resistance and of the latter two agents on endothelium-dependent (acetylcholine, ACh) and endothelium independent (sodium nitroprusside, SNP) vasodilatation; (b) the effects of L- and D-arginine on baseline vascular resistance; and (c) the effects of L-glutamine, an inhibitor of intracellular recycling of L-citrulline to L-arginine, on baseline resistance and on the response to ACh and SNP. 2. L-NAME, L-NOARG and ArgSA (6 x 10(-4) M final concentration) increased baseline diaphragmatic vascular resistance to a similar extent (28.6 +/- 4.2%, 26.7 +/- 4.3% and 32.8 +/- 4.6% respectively). L-NOARG and ArgSA reversed the vasodilator effect of ACh but not of SNP. 3. L- and D-arginine had no effect on vascular resistance. 4. L-Glutamine (10(-3) M) increased baseline vascular resistance by 10 +/- 1.9% (P < 0.05) but did not alter responses to either ACh or SNP. 5. Basal NO release plays a role in the regulation of baseline diaphragmatic vascular resistance. L-Arginine analogues tested potently and specifically inhibited this process. Moreover, extracellular L-arginine appears to have no effect on baseline diaphragmatic vascular resistance.

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Selected References

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