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Smoking cigarettes is a predictor of RA and may negatively impact on efficacy of anti-TNFs
Date:6/17/2010

8), p=0.02). Results of one further study undertaken in Switzerland3 showed that in experimental mice, the presence of smoke in the air induced the expression of the following genes: A 2.3 fold (p=0.02) induction of the expression of vascular endothelial growth factor (VEGF) was seen. VEGF is a growth signal that, when over-expressed, can stimulate the over-production of new blood vessels which can contribute to disease progression. A 2.7 fold (p=0.03) induction of the heat-shock protein DNAJC6 was seen. Heat shock proteins are induced in response to environmental stress and help to maintain cell function, but can also lead to activation of the immune system.

"The results of our study show that smoking (or the presence of smoke in the air) has an effect on the expression of the same genes and causes modifications in the same proteins in both mouse models and in human beings," said Dr. Caroline Ospelt, Centre of Experimental Rheumatology, University Hospital Zurich, Switzerland. "We hypothesise that this is because smoking alters the ability of certain proteins to elicit an immune response in those with a genetic pre-disposition to rheumatic conditions. This could be a contributing factor to the symptoms experienced and an individual's disease progression."

Study designs and key statistics The first Swedish study1 (OP0045) assessed a total of 33,346 individuals who were included in the Swedish Preventive Medicine Program (PMP) between 1974 and 1992 (male n=22,444, female n=10,902; incident RA cases n=296). The median time from inclusion to RA diagnosis was 12 years with a mean age of RA diagnosis at 60 years. In the second Swedish study2 (OP0014) 934 RA patients from the South Swedish Arthritis Treatment Group responded to a questionnaire sent out in 2005 that covered smoking habits.

In the Swiss study3 (OP0081) investigators compared tissues samples from mice exposed to room air (n=8) compared with cigarette smoke (n=6) with sampl
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Contact: Rory Berrie
eularpressoffice@uk.cohnwolfe.com
44-790-151-3297
European League Against Rheumatism
Source:Eurekalert

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