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Table 3 Factor analysis on cytokines and neuropeptides in synovial fluid

From: Levels of gastrin-releasing peptide and substance P in synovial fluid and serum correlate with levels of cytokines in rheumatoid arthritis

Variable Factor
  1 2 3 4
TNF-α   0.751   
IL-6    0.913  
MCP-1   0.912   
BN/GRP -0.436   0.623 0.327
SP 0.409 0.33 0.361 0.671
VIP 0.784    
CGRP 0.715    -0.472
NPY 0.893    
ESR     0.71
  1. Principal-component analysis for cytokines and neuropeptides in synovial fluid from 23 patients with long-standing RA, and for the ESR. BN/GRP, bombesin/gastrin-releasing peptide; CGRP, calcitonin-gene-related peptide; ESR, erythrocyte sedimentation rate; MCP, monocyte chemoattractant protein-1; NPY, neuropeptide Y; RA, rheumatoid arthritis; SP, substance P; TNF, tumour necrosis factor; VIP, vasoactive intestinal peptide.