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* Laboratory of Neuroendocrinoimmunology, Department of Internal Medicine I, University Medical Center Regensburg, Germany; and
Department of Orthopedic Surgery, Bavarian Red Cross Hospital, Bad Abbach, Germany
1Correspondence: Laboratory of Neuroendocrinoimmunology, Department of Internal Medicine I, University Medical Center Regensburg, Franz-Josef-Strauss-Allee 11, 93042 Regensburg, Germany. E-mail: Rainer.Straub{at}klinik.uni-regensburg.de
Our objective was to investigate sympathetic and sensory nerve fibers in synovial tissue in rheumatoid arthritis (RA) and osteoarthritis (OA) in relation to histological inflammation and synovial cytokine and norepinephrine (NE) secretion. Immunohistochemistry was used to detect nerve fibers and inflammatory parameters. A superfusion technique of synovial tissue pieces was used to investigate cytokine and NE secretion. In RA, we detected 0.2 ± 0.04 tyrosine hydroxylase-positive (TH-positive=sympathetic) nerve fibers/mm2 as compared to 4.4 ± 0.8 nerve fibers/mm2 in OA (P<0.001). In RA, there was a negative correlation between the number of TH-positive nerve fibers and inflammation index (RRank=-0.705, P=0.002) and synovial IL-6 secretion (RRank=-0.630, P=0.009), which was not found in OA. Substance P-positive (=sensory) nerve fibers were increased in RA as compared to OA (3.5±0.2 vs. 2.3±0.3/mm2, P=0.009). Despite lower numbers of sympathetic nerve fibers in RA than in OA, NE release was similar at baseline (RA vs. OA: 152±36 vs. 106±21 pg/ml, n.s.). Basal synovial NE secretions correlate with the number of TH-positive CD 163+ synovial macrophages (RA: RRank=0.622, P=0.031; OA: RRank=0.299, n.s.), and synovial macrophages have been shown to produce NE in vitro. Whereas sympathetic innervation is reduced, sensory innervation is increased in the synovium from patients with longstanding RA when compared to the synovium from OA patients. The differential patterns of innervation are dependent on the severity of the inflammation. However, NE secretion from the synovial tissue is maintained by synovial macrophages. This demonstrates a loss of the influence of the sympathetic nervous system on the inflammation, accompanied by an up-regulation of the sensory inputs into the joint, which may contribute to the maintenance of the disease.—Miller, L. E., Jüsten, H.-P., Schölmerich, J., Straub, R. H. The loss of sympathetic nerve fibers in the synovial tissue of patients with rheumatoid arthritis is accompanied by increased norepinephrine release from synovial macrophages.
Key Words: osteoarthritis • synovium • norepinephrine • neuroimmunomodulators
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