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Department of Pediatrics, Albany Medical College, Albany, New York 12208
Nitric oxide (NO) synthesis is markedly
augmented in states of inflammation, largely due to the expression of
inducible nitric oxide synthase (iNOS). Although NO has
anti-inflammatory consequences under basal conditions, it remains
enigmatic as to why NO displays proinflammatory characteristics in
chronic inflammation. Either the anti-inflammatory actions are weak and
of little consequence or, alternatively, other factors influence the
role of NO in chronic inflammation. We propose that the answer to this
enigma lies in the conversion of NO to other higher oxides of nitrogen
(NO2, nitrogen dioxide;
N2O3,
dinitrogen trioxide; and
ONOO
, peroxynitrite).
Emerging therapeutic strategies may be independent of NO synthesis;
e.g., antioxidants have no direct interaction with NO but attenuate the
levels and activity of higher nitrogen oxides. Thus, whereas iNOS may
be a marker for the proinflammatory actions of NO, the species that
mediate tissue injury/dysfunction in inflammation are likely to be
nitrogen oxides other than NO.
peroxynitrite; apoptosis; oxidant; cytokine
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