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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Inflammation research 44 (1995), S. 313-316 
    ISSN: 1420-908X
    Keywords: Platelet-activating factor ; Neutrophils ; Rheumatoid arthritis ; Synovial fluid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract PAF-acether (PAF) is a pro-inflammatory phospholipid molecule potentially involved in the pathogenesis of arthritis. PAF and related metabolites have been isolated in the synovial fluid from patients with arthritis. The aim of this study was to determine PAF production by neutrophils isolated from synovial fluid and blood in patients with rheumatoid arthritis. Blood neutrophils from normal donors were also studied for their capacity to form PAF. Neutrophils were stimulated with the calcium ionophore A23187 (2µM) for 1 to 60min. PAF released in the medium and PAF associated to cells were measured. In synovial fluid neutrophils, PAF production began as soon as 1 min of stimulation (16.1 ± 6.3 pmol per 1 × 106 cells) and reached a maximum at 20min: 29.2 ± 2.8 pmol per 1 × 106 cells (mean ± SEM, n = 5). The amount of PAF released in the supernatant increased with the length of stimulation and was maximal after 30min (33.5%, percentage of released over total PAF, n = 5). After A23187 stimulation, similar amounts of PAF were produced by blood neutrophils from RA and control patients. However, neutrophils isolated from the joint had a lower capacity to produce PAF than blood neutrophils from the same patients. The present results demonstrate the synthesis and release of PAF by synovial fluid neutrophils. They suggest that neutrophils may be the source of PAF locally present in the joint. Newly synthetised PAF could participate in the amplification of the local inflammatory reaction.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1365-2516
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Between 1970 and 1994, 116 chemical and 90 radioactive synovectomies were performed in 107 patients with severe haemophilia and two with type 3 von Willebrand's disease. The products used were osmic acid (OA) in 100 cases, 90-Yttrium in 35 cases, 186-Rhenium in 48, 169-Erbium in two, hexacetonide triamcinolone in 16 and radioactive gold in five cases. The use of radioactive colloids is not allowed in France in patients under 15 years of age. Twenty-nine patients had more than one synovectomy per joint. All patients were evaluated for 6 months post-synovectomy, using both a clinical and a radiological score. Six months after synovectomy, a good or excellent result was obtained for 81% of the joints treated with isotopes, compared with 44% of those treated with OA, P 〈 0.001. This superiority of isotopes over osmic acid was still observed after 6 months for the 89 joints that were re-evaluated, with follow-up ranging from 1 to 9 years. It was possible to calculate a radiological score in 84 cases. With OA the best results were from the joints with the lowest scores pre-synovectomy (〈7). No correlation could be established between the clinical and the radiological scores, due to the small size of the sample. In summary: (1) chemical and radioactive synovectomy are simple and safe procedures for haemophilic arthropathy, (2) in our series, after 6 months the efficacy of isotopic synovectomy was greater than that of chemical synovectomy, and this benefit seems to persist after 6 months, and up to 9 years in the group of patients with longer-term follow-up.
    Type of Medium: Electronic Resource
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