Glucocorticoids suppress levels of immunoreactive bradykinin in inflamed tissue as evaluated by microdialysis probes

Kenneth M. Hargreaves, Ann Costello

Research output: Contribution to journalArticlepeer-review

126 Scopus citations


Although circulating bradykinin increases during surgery, concentrations remain unknown in the biologically relevant compartment, the inflamed tissue. We have developed a new method, using microdialysis probes, for collecting tissue samples of immunoreactive bradykinin in both postoperative patients and rats injected with carrageenan. In vitro studies determined optimal flow rate, that dialysate levels of immunoreactive bradykinin were linearly related to external concentrations, and that the probes do not activate bradykinin synthesis. In oral surgery patients, tissue levels of immunoreactive bradykinin peaked approximately 3 hours after surgery. Preoperative administration of methylprednisolone (125 mg) reduced immunoreactive bradykinin levels by 62% (p < 0.001) compared with placebo. Comparison of bradykinin levels to concurrent pain revealed a counterclockwise hysteresis, suggesting a delay between peak levels of bradykinin in the effect compartment and pain. In rats, dexamethasone suppressed tissue levels of immunoreactive bradykinin. The glucocorticoid suppression was dependent on de novo protein synthesis. Microdialysis appears to be a novel and useful method for measuring the peripheral release of bradykinin and, possibly, other inflammatory mediators.

Original languageEnglish (US)
Pages (from-to)168-178
Number of pages11
JournalClinical Pharmacology and Therapeutics
Issue number2
StatePublished - Aug 1990
Externally publishedYes

ASJC Scopus subject areas

  • Pharmacology (medical)
  • Pharmacology


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