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Updated: Jul 3, 2026

Analytical Techniques for Assaying Nitric Oxide Bioactivity
Published on: June 18, 2012
Widespread tissue distribution, species distribution and changes in activity of Ca(2+)-dependent and
M Salter1, R G Knowles, S Moncada
1Wellcome Research Laboratories, Beckenham, Kent, UK.
Abstract:
The distribution of Ca(2+)-dependent and Ca(2+)-independent nitric oxide synthase (NOS) was studied in rabbits and in control and endotoxin-treated rats and guinea-pigs. There was a widespread localization of NOS which differed for the two forms of the enzyme and which showed marked differences between species. Endotoxin induced the activity of the Ca(2+)-independent NOS in many tissues and also increased the activity of Ca(2+)-dependent NOS in the rat ileum and caecum. These results demonstrate the differential distribution of NOSs in control and endotoxin-treated animals and emphasize the widespread biological role of nitric oxide (NO).
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