TAILIEUCHUNG - Báo cáo y học: " Tumor necrosis factor and norepinephrine lower the levels of human neutrophil peptides 1-3 secretion by mixed synovial tissue cultures in osteoarthritis and rheumatoid arthritis"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài: Tumor necrosis factor and norepinephrine lower the levels of human neutrophil peptides 1-3 secretion by mixed synovial tissue cultures in osteoarthritis and rheumatoid arthritis. | Riepl et al. Arthritis Research Therapy 2010 12 R110 http content 12 3 R110 RESEARCH ARTICLE Open Access Tumior necrosis factor and norepinephrine lower the levels of human neutrophil peptides 1-3 secretion by mixed synovial tissue cultures in osteoarthritis and rheumatoid arthritis Birgit Riepl 1 Susanne Grassel2 Reiner Wiest1 Martin Fleck1 and Rainer H Straub 1 Abstract Introduction Neutrophils and monocytes play an important role in overt inflammation in chronic inflammatory joint diseases such as rheumatoid arthritis RA . The sympathetic nervous system SNS inhibits many neutrophil monocyte functions and macrophage tumor necrosis factor TNF but because of the loss of sympathetic nerve fibers in inflamed tissue sympathetic control is attenuated. In this study we focused on noradrenergic and TNF regulation of human neutrophil peptides 1-3 HNP1-3 which are proinflammatory bactericidal a-defensins. Methods Synovial tissue and cells were obtained from patients with RA and osteoarthritis OA . By using immunohistochemistry and immunofluorescence HNP1-3 were tracked in the tissue. With synovial cell-culture experiments and ELISA effects of norepinephrine TNF and cortisol on HNP1 -3 were detected. Results HNP1-3 were abundantly expressed in the synovial lining and adjacent sublining area but not in deeper layers of synovial tissue. The human p-defensin-2 used as control was hardly detectable in the tissue and in supernatants. HNP1-3 double-stained with neutrophils but not with macrophages fibroblasts T B lymphocytes and mast cells. Norepinephrine dose-dependently decreased HNP1-3 levels from RA and OA cells. TNF also inhibited HNP1-3 levels from OA but not from RA cells. Cortisol inhibited HNP1-3 levels only in OA patients. A combination of norepinephrine and cortisol did not show additive or synergistic effects. Conclusions This study demonstrated an inhibitory effect of norepinephrine on HNP1-3 of mixed synovial cells. In light of these findings

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