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Sensory nerve fibres (NFs) contain two major neuropeptides, substance P (SP) and calcitonin gene-related peptide (CGRP). The pro-inflammatory role of SP is known, while CGRP has anti-inflammatory activities by inhibiting T helper type 1 cytokines, TNF secretion and leucocyte proliferation. We demonstrated the increase of SP-positive NFs in RA as compared with OA. This study investigated the density of CGRP-positive NFs relative to SP-positive NFs or sympathetic NFs in synovial tissue of patients with RA and OA.

rheumatology

Lower density of synovial nerve fibres positive for calcitonin gene-related peptide relative to substance P in rheumatoid arthritis but not in osteoarthritis