OBJECTIVES AND DESIGN: To study the consequences of mast cell activation in human synovial tissue. METHODS: Synovial tissue was obtained from 18 RA patients and mast cells was selectively activated in synovial tissue explant cultures. Expression of TNF-alpha, IL-1beta and IL-1Ra were determined and tissue distribution of IL-1beta was studied. RESULTS: Compared to untreated synovia, selective activation of synovial mast cells increased significantly the production of TNF-alpha (0.49 +/- 0.88 vs. 4.56 +/- 3.18 pg/mg wet tissue, p < 0.001) and IL-1beta (0.058 +/- 0.032 vs. 2.55 +/- 1.98 pg/mg wet tissue, p = 0.013). The expression of TNF-alpha and IL-1beta mRNA increased significantly (19-fold (p = 0.009) and 13-fold (p = 0.031), respectively). Mast cell activation induced IL-1beta expression in particular in nearby CD68 positive synovial macrophages. Secretion of IL-1Ra was also increased but to a lesser degree than that of IL-1beta. CONCLUSIONS: Synovial mast cells produce proinflammmatory cytokines and may thus contribute to the inflammation in RA.
OBJECTIVES AND DESIGN: To study the consequences of mast cell activation in human synovial tissue. METHODS: Synovial tissue was obtained from 18 RApatients and mast cells was selectively activated in synovial tissue explant cultures. Expression of TNF-alpha, IL-1beta and IL-1Ra were determined and tissue distribution of IL-1beta was studied. RESULTS: Compared to untreated synovia, selective activation of synovial mast cells increased significantly the production of TNF-alpha (0.49 +/- 0.88 vs. 4.56 +/- 3.18 pg/mg wet tissue, p < 0.001) and IL-1beta (0.058 +/- 0.032 vs. 2.55 +/- 1.98 pg/mg wet tissue, p = 0.013). The expression of TNF-alpha and IL-1beta mRNA increased significantly (19-fold (p = 0.009) and 13-fold (p = 0.031), respectively). Mast cell activation induced IL-1beta expression in particular in nearby CD68 positive synovial macrophages. Secretion of IL-1Ra was also increased but to a lesser degree than that of IL-1beta. CONCLUSIONS: Synovial mast cells produce proinflammmatory cytokines and may thus contribute to the inflammation in RA.
Authors: Geethani Bandara; Michael A Beaven; Ana Olivera; Alasdair M Gilfillan; Dean D Metcalfe Journal: Eur J Immunol Date: 2015-09-09 Impact factor: 5.532
Authors: S M Vieira; H P Lemos; R Grespan; M H Napimoga; D Dal-Secco; A Freitas; T M Cunha; W A Verri; D A Souza-Junior; M C Jamur; K S Fernandes; C Oliver; J S Silva; M M Teixeira; F Q Cunha Journal: Br J Pharmacol Date: 2009-08-20 Impact factor: 8.739
Authors: Ellen M Moran; René Heydrich; Chin Teck Ng; Tajvur P Saber; Jennifer McCormick; Joachim Sieper; Heiner Appel; Ursula Fearon; Douglas J Veale Journal: PLoS One Date: 2011-08-24 Impact factor: 3.240