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Effects of niflumic acid on polyphosphoinositide and oxidative metabolism in polymorphonuclear leukocytes from healthy and thermally injured rats

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Thermal injury in rats leads to an impairment of polymorphonuclear leukocyte (PMN) functions, particularly oxidative metabolism and phosphoinositide turnover. As prostaglandin E2, which has immunosuppressive properties, is released in high levels after burn trauma, we investigated the in vitro and in vivo effects of a nonsteroidal antiinflammatory drug, niflumic acid, on oxidative and phosphoinositide metabolism in PMNs from healthy and burned rats. Given the role of fluoride ions on PMN, the influence of niflumic acid was compared with that of sodium fluoride (NaF) at equivalent doses of F. In vitro, niflumic acid and sodium fluoride had no effect on oxidative metabolism in stimulated by formyl methionyl-leucyl-phenylalanine (FMLP) or opsonized zymosan (OZ) or nonstimulated PMNs from healthy and burned rats. Niflumic acid slightly increased the production of inositol phosphate by nonstimulated PMNs from healthy and burned rats. Niflumic acid and NaF partly restored the stimulating effect of FMLP on inositol phosphate production by PMNs from burned rats. In vivo treatment with niflumic acid and NaF increased the oxidative metabolism of PMNs from burned rats but not healthy rats. Niflumic acid, more than NaF, restored the activity of both stimulants on phosphoinositide metabolism in PMNs from burned rats. In conclusion, at non-antiinflammatory doses, while inhibiting cyclooxygenase activity, niflumic acid exerts a complex effect on the burn-induced depression of PMN functions. The fluoride anion induces similar but generally weaker effects and seems to be involved in the restoring effects of niflumic acid on PMN functions in burned rats.

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Tissot, M., Roch-Arveiller, M., Fontagne, J. et al. Effects of niflumic acid on polyphosphoinositide and oxidative metabolism in polymorphonuclear leukocytes from healthy and thermally injured rats. Inflammation 16, 645–657 (1992). https://doi.org/10.1007/BF00919347

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  • Oxidative Metabolism
  • Polymorphonuclear Leukocyte
  • Thermal Injury
  • Formyl
  • Inositol Phosphate