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. 1996 Feb 15;314(Pt 1):109–113. doi: 10.1042/bj3140109

Kinetic modelling of the nitric oxide gradient generated in vitro by adherent cells expressing inducible nitric oxide synthase.

M Laurent 1, M Lepoivre 1, J P Tenu 1
PMCID: PMC1217012  PMID: 8660270

Abstract

Inducible nitric oxide (NO) synthase produces a long-lasting NO flux which can exert cytotoxic effects on target cells. A prerequisite for the understanding of the molecular basis of NO action is quantitative data on the availability of this small neutral radical molecule at both the spatial and temporal levels. The limits of NO availability depend on the respective rates of NO production, diffusion and autoxidation by molecular oxygen. Kinetic modeling of these processes has been performed for a widely used experimental system consisting of a monolayer of adherent cells cultured in vitro for hours in unstirred culture medium. It appears that: (i) the maximal NO concentration in the culture is in the immediate vicinity of the monolayer, where target cells will sediment; (ii) the steady-state NO concentration in this area is lower than 4 to 5 microM; and (iii) measurements of nitrite/nitrate or citrulline accumulation in the bulk cell medium culture during a given time period significantly underestimate (by a factor of up to 3 to 4) the true rate of NO synthesis at the level of the producer cell. This rate can be, nevertheless, easily estimated from the rate of production of the stable NO synthase products.

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Selected References

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