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The levels of neutrophils oxidative burst in rheumatic disorders

C Stăvaru1, A Dolganiuc, D Baltaru

  • 1Cantacuzino Institute, Bucharest, Romania.

Roumanian Archives of Microbiology and Immunology
|February 16, 2002
PubMed

Insights

Polymorphonuclear leukocytes (PMNs) play a distinct role in rheumatoid arthritis (RA) versus osteoarthritis (OA) joint damage. Their oxygen free radical release differs significantly in synovial fluid, suggesting a diagnostic potential for PMNs in differentiating these rheumatic conditions.

Area of Science:

  • Rheumatology
  • Immunology
  • Cell Biology

Background:

  • Rheumatoid arthritis (RA) and osteoarthritis (OA) are common joint diseases with distinct pathologies.
  • Polymorphonuclear leukocytes (PMNs) are implicated in inflammatory tissue destruction.
  • Understanding PMN behavior is crucial for differentiating RA and OA.

Purpose of the Study:

  • To investigate the role of PMNs in tissue destruction in RA and OA.
  • To compare PMN activity, specifically oxygen free radical (OFR) release, in patients with RA and OA.
  • To evaluate the potential of chemiluminescence assays for differential diagnosis.

Main Methods:

  • Analysis of PMN counts in joint tissues of RA and OA patients.
  • Measurement of OFR release from peripheral blood PMNs (unstimulated and stimulated with opsonized zymozan or ConA).
  • Assessment of OFR release from synovial fluid (SF) neutrophils in RA and OA patients.

Main Results:

  • Higher PMN numbers were observed in RA joints compared to OA joints.
  • Peripheral blood PMNs from both groups released normal OFR levels.
  • SF neutrophils from RA patients showed high OFR release when unstimulated but low release when stimulated.
  • SF neutrophils from OA patients exhibited diminished OFR release in both unstimulated and stimulated states.

Conclusions:

  • PMN activity, particularly OFR release from SF neutrophils, differs significantly between RA and OA.
  • Chemiluminescence assays can detect these distinct PMN differences.
  • This assay may serve as a valuable laboratory test for the differential diagnosis of RA and OA.

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