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Acute-phase proteins in osteoarthritis

J D Sipe1

  • 1Department of Biochemistry, Boston University School of Medicine, MA 02118, USA.

Seminars in Arthritis and Rheumatism
|October 1, 1995
PubMed
Summary

Osteoarthritis (OA) involves joint destruction and cartilage loss, differing from rheumatoid arthritis (RA) by lacking a strong systemic inflammatory response. Monitoring C-reactive protein (CRP) may enable earlier OA detection and treatment.

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Area of Science:

  • Rheumatology and immunology
  • Biochemistry of joint diseases

Background:

  • Osteoarthritis (OA) is characterized by joint destruction, primarily articular cartilage loss, stemming from metabolic defects in chondrocytes.
  • Unlike rheumatoid arthritis (RA), OA is not typically associated with a large-scale systemic inflammatory response, leading to less study of acute-phase proteins.
  • Current OA diagnosis relies heavily on radiographic assessment, which is often late-stage and provides limited insight into disease activity or prognosis.

Purpose of the Study:

  • To explore the role of acute-phase response proteins as potential biomarkers for osteoarthritis (OA) disease activity.
  • To investigate the elevation of C-reactive protein (CRP) and serum amyloid A (SAA) in OA compared to rheumatoid arthritis (RA).
  • To assess the potential of monitoring CRP for earlier OA detection and improved treatment strategies.

Main Methods:

  • Review of existing literature on acute-phase response proteins in osteoarthritis (OA) and rheumatoid arthritis (RA).
  • Comparison of cytokine involvement (IL-1, TNF-alpha, IL-6) in the pathogenesis of both OA and RA.
  • Analysis of studies reporting CRP and SAA concentrations in OA patients.

Main Results:

  • While OA involves cytokines like IL-1, TNF-alpha, and IL-6, it acts as a less potent stimulus for the systemic acute-phase response compared to RA.
  • Recent studies indicate elevated concentrations of C-reactive protein (CRP) and serum amyloid A (SAA) in OA patients, though generally lower than in RA.
  • Current diagnostic methods for OA, such as radiography, are limited in assessing disease activity and prognosis.

Conclusions:

  • The acute-phase response, particularly C-reactive protein (CRP) and serum amyloid A (SAA), shows potential as a biomarker for osteoarthritis (OA).
  • Elevated CRP and SAA levels in OA, though less pronounced than in RA, suggest a role for systemic inflammation.
  • Future research focusing on long-term CRP monitoring could lead to earlier OA diagnosis and more effective therapeutic interventions.

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