Bradylkinin is increased during acute and chronic inflammation Therapeutic implications

Kenneth M. Hargreaves, Emanuel S. Troullos, Raymond A. Dionne, Elizabeth A. Schmidt, Susan C. Schafer, Jean L. Joris

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


Bradykinin is a potent pain-producing substance, yet little is known about its role in inflammation. The present study measured circulating levels of immunoreactive bradykinin in a clinical model of acute inflammation (oral surgery) and chronic inflammation (rheumatoid arthritis) and in the rat carrageenan model of inflammation. The effects of a kallikrein inhibitor (soybean trypsin inhibitor) on blocking bradykinin synthesis in vitro and its analgesic actions in the rat model were also evaluated. Levels of immunoreactive bradykinin increased threefold to fourfold during oral surgery. Levels were twofold to threefold greater in patients with rheumatoid arthritis compared with control subjects. Levels of immunoreactive bradykinin increased twofold in rats during carrageenan inflammation. Soybean trypsin inhibitor blocked synthesis of bradykinin in vitro and possessed analgesic activity in rats. The results indicate that the bradykinin system is activated during inflammation. Kallikrein inhibitors may represent a new class of analgesic/ antiinflammatory drugs.

Original languageEnglish (US)
Pages (from-to)613-621
Number of pages9
JournalClinical Pharmacology and Therapeutics
Issue number6
StatePublished - Dec 1988
Externally publishedYes

ASJC Scopus subject areas

  • Pharmacology
  • Pharmacology (medical)


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