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Effect of an immunomodulating agent, RU 414740, on polymorphonuclear responsiveness after burn injury

M Roch-Arveiller1, J Fontagne, A el Abbouyi

  • 1CNRS URA 595-Pharmacologie and Biochimie A Hôpital Cochin, Paris, France.

Inflammation
|December 1, 1991
PubMed

Insights

Burn injury impairs polymorphonuclear leukocyte (PMN) function. RU 41740, a PMN stimulant, enhanced oxidative metabolism in PMNs from both burned and healthy rats in vitro and in vivo.

Area of Science:

  • Immunology
  • Trauma Research

Background:

  • Burn trauma is known to impair polymorphonuclear leukocyte (PMN) functions.
  • Investigating agents that can restore or enhance PMN function post-burn is crucial for improving patient outcomes.

Purpose of the Study:

  • To evaluate the effect of RU 41740, a known PMN stimulant, on rat PMN functions following burn injury.
  • To assess both in vitro and in vivo effects of RU 41740 on PMN oxidative metabolism in burned and healthy rats.

Main Methods:

  • Burned and healthy rats were used to assess PMN function.
  • In vitro and in vivo experiments were conducted using RU 41740 at varying concentrations and doses.
  • Oxidative metabolism of PMNs was measured as an indicator of function.

Main Results:

  • PMN responsiveness to stimuli was reduced by approximately 40% in untreated burned rats compared to controls.
  • RU 41740 treatment increased PMN oxidative metabolism in both healthy and burned rats, with a dose-dependent effect.
  • In vitro, higher RU 41740 concentrations were needed for burned rats (10 µg/ml) than healthy rats (1 µg/ml) to show significant effects.
  • In vivo, 10 mg/kg/day of RU 41740 was the maximal effective dose for enhancing PMN oxidative metabolism in both groups, while higher doses (25-50 mg/kg/day) showed inhibitory effects.

Conclusions:

  • RU 41740 demonstrates potential in enhancing impaired PMN oxidative metabolism following burn injury.
  • Both in vitro and in vivo administration of RU 41740 can modulate PMN function, suggesting therapeutic possibilities.
  • Optimal dosing is critical, as higher concentrations/doses of RU 41740 can inhibit PMN oxidative metabolism.

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