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Comparative effects of several nitric oxide donors on intracellular cyclic GMP levels in bovine chromaffin cells: correlation with nitric oxide production.

Abstract：

:1. Sodium nitroprusside, S-nitroso-N-acetyl-D,L-penicillamine, Spermine NONOate and DEA NONOate raised cyclic GMP levels in bovine chromaffin cells in a time and concentration dependent manner with different potencies, the most potent being DEA/NO with an EC50 value of 0.38 +/- 0.02 microM. 2. Measurements of NO released from these donors revealed that DEA/NO decomposed with a half-life (t1/2) of 3.9 +/- 0.2 min. The t1/2 for SPER/NO was 37 +/- 3 min. SNAP decomposed more slowly (t1/2 = 37 +/- 4 h) and after 60 min the amount of NO produced corresponded to less than 2% of the total SNAP present. The rate of NO production from SNAP was increased by the presence of glutathione. 3. For DEA/NO and SPER/NO there was a clear correlation between nitric oxide production and cyclic GMP increases. Their threshold concentrations were 0.05 microM and maximal effective concentration between 2.5 and 5 microM. 4. For SNAP, threshold activation was seen at 1 microM, whereas full activation required a higher concentration (500-750 microM). The dose-response for SNAP increases in cyclic GMP was shifted nearly two orders of magnitude lower in the presence of glutathione. At higher concentrations an inhibition of cyclic GMP accumulation was found. This effect was not observed with either the nitric oxide-deficient SNAP analogue or other NO donors. 5. Although NO-donors are likely to be valuable for studying NO functions, their effective concentrations and the amount of NO released by them are very different and should be assessed in each system to ensure that physiological concentrations of NO are used.

journal_name

Br J Pharmacol

journal_title

British journal of pharmacology

authors

Ferrero R,Rodríguez-Pascual F,Miras-Portugal MT,Torres M

doi

10.1038/sj.bjp.0702607

subject

Has Abstract

pub_date

1999-06-01 00:00:00

pages

779-87

issue

3

eissn

0007-1188

issn

1476-5381

journal_volume

127

pub_type

杂志文章

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