Abstract:
:Increases in the levels of proinflammatory cytokines, such as TNF alpha, have been intricately linked with arthritis and the pathogenesis of several models of neuropathic pain. In addition, arthritis (as well as other types of persistent pain) is associated with increased sympathetic activity and alterations of other responses in autonomic nervous activity. Adrenergic regulation of LPS-stimulated TNF production by M phi isolated from rats with streptococcal-cell-wall (SCW)-induced arthritis has been examined. Serum TNF levels and the cellular composition of peritoneal exudates have also been assessed. M phi were obtained from: (1) normal control rats, (2) animals injected with complete Freund's adjuvant (CFA), 3 rats injected with SCW and arthritic, and (4) those injected with SCW, which failed to develop arthritis. Serum levels of TNF alpha in rats that develop arthritis are significantly greater (2.4 fold) than levels from the other groups. The proportion of OX19-positive T cell subpopulations are the same in peritoneal exudates from all groups. Immunocytochemical staining also reveals differences between M phi subgroups in the degree of activation. Peritoneal exudates from rats that develop arthritis contain a greater proportion of the high TNF producing subclass of M phi, as identified by positive ED3 staining (p < 0.001). In contrast, Ia antigen presenting M phi (OX6-positive) in the peritoneal exudate cells are only elevated in rats administered CFA. The selective blockade of adrenergic receptors by idazoxan or propranolol demonstrates that the constitutive involvement of either alpha 2 or beta-adrenergic regulation of M phi-derived TNF production is pronounced in rats with arthritis (p < 0.001). These investigations demonstrate a distinctive pattern of peripheral M phi populations in rats that develop chronic polyarthritic pain. We believe that identification of interactions between the adrenergic responses and proinflammatory cytokines will lead to the development of improved strategies to treat patients with chronic pain.
journal_name
J Neuroimmunoljournal_title
Journal of neuroimmunologyauthors
Chou RC,Dong XL,Noble BK,Knight PR,Spengler RNdoi
10.1016/s0165-5728(97)00196-3subject
Has Abstractpub_date
1998-03-01 00:00:00pages
140-8issue
2eissn
0165-5728issn
1872-8421pii
S0165-5728(97)00196-3journal_volume
82pub_type
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