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Annals of the Rheumatic Diseases logoLink to Annals of the Rheumatic Diseases
. 2004 Nov;63(Suppl 2):ii28–ii31. doi: 10.1136/ard.2004.028225

What precedes development of rheumatoid arthritis?

L Klareskog, L Alfredsson, S Rantapaa-Dahlqvis, E Berglin, P Stolt, L Padyukov
PMCID: PMC1766766  PMID: 15479868

Abstract

Studies on aetiology of inflammatory diseases such as rheumatoid arthritis (RA) need to investigate the potential environmental triggers that are active before onset of disease, the genetic context in which these triggers act, and whether the presence of such triggers in an arthritis prone genetic context will give rise to the immune reactions associated with/preceding RA. Such knowledge would help not only to address much better the issue of causality of these potential triggers and the immune reactions, but also to carry out various interventions aimed at influencing the disease provoking immune events before development of clinical signs of disease.

This short report summarises recent data demonstrating (a) the presence of anticitrullin antibodies or rheumatoid factors in between a third and half of patients with RA before development of clinical signs; (b) long term smoking is associated with a high risk of future development of seropositive but not seronegative RA; and (c) a strong gene–environment interaction between smoking and SE genes in the development of seropositive RA.

We conclude that, in a certain genetic context, smoking is a potential trigger of RA, and a combination of the two factors is associated with the occurrence of immune reactions long before the onset of RA.

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Figure 1.

Figure 1

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 Schematic comparison of the events occurring in the development and course of rheumatoid arthritis (RA) in humans and experimentally induced arthritis in rodents.

Figure 2.

Figure 2

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 Relative risk (RR) for development of rheumatoid arthritis (RA) in current smokers (with different numbers of copies (0–2) of the shared epitope (SE) of HLA-DR) compared with never smokers. (A) RR for seropositive RA and (B) RR for seronegative RA. These graphs are schematic representations of the original data from a case–control study of RA reported in reference 9.

Figure 3.

Figure 3

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 Schematic outline of how aetiological studies as well as interventions in the pathways leading to rheumatoid arthritis (RA) should be undertaken before onset of clinical signs of RA. CCP, cyclic citrullinated peptide; RF, rheumatoid factor; SE shared epitope.

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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