Analysis of changes in acute‐phase plasma proteins in an acute inflammatory response and in rheumatoid arthritis using two‐dimensional gel electrophoresis

Abstract

Two-dimensional (2-D) gel analysis was used to examine differences in the levels of 19 plasma proteins: before and after an acute inflammatory reaction (parenteral typhoid vaccination) in normal subjects, between rheumatoid arthritis (RA) patients and normals and in RA patients treated with tenidap (120 mg) and piroxicam (20 mg). Typhoid vaccination increased levels of SAA, haptoglobin α₁, haptoglobin α₂, haptoglobin β and α₁-anti-chymotrypsin but decreased transthyretin and apolipoprotein E. In RA patients, serum amyloid A (SAA), haptoglobin α₂, haptoglobin β, α₁-antichymotrypsin and C3 proactivator levels were elevated while apolipoprotein A-I, apolipoprotein A-IV, transthyretin, Gc-globulin, α₂-HS glycoprotein, α₂-macroglobulin and α₁-B glycoprotein levels were decreased, compared to normals. Compared to piroxicam, tenidap lowered levels of α₁-antiprotease and SAA but raised the levels of transthyretin, Gc-globulin, α₂-HS-glycoprotein and α₂-macroglobulin in RA patients. C-reactive protein (CRP) could not be quantified on 2-D gels but, When measured by rate nephelometry, levels were reduced after treatment with tenidap compared to piroxicam. The general pattern of the acute phase protein response to an acute inflammatory response to typhoid vaccination is similar to that in the chronic inflammatory condition, RA. The impact of tenidap on both positive and negative acute-phase proteins in RA patients could clearly be distinguished from that of piroxicam.