Enhancement of human peripheral blood monocyte respiratory burst activity by aggregated C-reactive protein

J. M. Zeller, A. L. Landay, T. F. Lint, H. Gewurz

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


We had previously demonstrated that C-reactive protein (CRP), an acute phase reactant, when aggregated or coupled to a ligand, interacts with monocytes and certain human peripheral blood lymphocytes. The purpose of the present study, after further characterizing the binding interaction of CRP with human monocytes, was to focus on the biological response of monocytes to CRP binding. Flow cytometric analysis of human mononuclear leukocytes, following incubation with fluoresceinated heat-aggregated CRP (Agg-CRP), revealed that while greater than 70% of monocytes bound Agg-CRP, only 8% of lymphocytes demonstrated positive fluorescence. Furthermore, mean channel fluorescence values indicated that monocytes bound greater amounts of Agg-CRP per cell than did lymphocytes. Luminol-enhanced chemiluminescence (CL) was used as a measure of monocyte respiratory burst activity. Monocytes were stimulated only minimally by Agg-CRP alone; however, Agg-CRP substantially enhanced the CL response to heat-aggretated IgG. This Agg-CRP enhancing effect was selective for IgG-initiated monocyte activation, as no augmentation in CL was observed following cell stimulation with phorbol myristate acetate or serum-opsonized zymosan. These results demonstrate that aggregated CRP binds to the major proportion of human monocytes and selectively augments Fc receptor-mediated stimulation of monocyte oxidative metabolism.

Original languageEnglish (US)
Pages (from-to)769-783
Number of pages15
JournalJournal of Leukocyte Biology
Issue number6
StatePublished - 1986
Externally publishedYes

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Cell Biology


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