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Rheumatology Advance Access originally published online on December 13, 2005
Rheumatology 2006 45(2):229-230; doi:10.1093/rheumatology/kei196
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© The Author 2005. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org


LETTER TO THE EDITOR

Sequential synovial fluid sampling suggests plasma and synovial fluid IL-6 vary independently in rheumatoid arthritis

M. G. Perry, L. Richards1, M. S. Harbuz1, D. S. Jessop1 and J. R. Kirwan

Academic Rheumatology, University of Bristol, Bristol Royal Infirmary and 1 Henry Wellcome Laboratories for Integrated Neuroscience and Endocrinology, University of Bristol, Bristol, UK

Correspondence to: M. G. Perry, Academic Rheumatology Unit, Bristol Royal Infirmary, Marlborough Street, Bristol BS2 8HW, UK. E-mail: mark.g.perry@bristol.ac.uk

The first 10% of the full text of this article appears below.

SIR, Inflammatory cytokines, including interleukin-6 (IL-6), are raised in rheumatoid arthritis (RA). Single paired daytime samples show that the IL-6 and TNF-{alpha} concentrations in synovial fluid exceed blood concentrations during the day [1–3], and these and other data suggest that joints are the source. Recent data have shown that plasma IL-6 in RA follows a circadian pattern with a peak at 6 a.m. [4]. If IL-6 is generated inside joints and diffuses into plasma, it might be expected that the synovial fluid IL-6 concentration . . . [Full Text of this Article]


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