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MRI and quantification of draining lymph node function in inflammatory arthritis.

Steven T Proulx¹, Edmund Kwok, Zhigang You

¹The Center for Musculoskeletal Research, University of Rochester, Rochester, NY 14642, USA.

Annals of the New York Academy of Sciences

|July 25, 2007

Summary

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Enhanced lymphatic drainage, measured by lymph node capacity (LNcap), shows a protective effect against inflammatory arthritis progression. Lower LNcap in TNF-Tg mice correlated with increased arthritis severity, indicating its prognostic value.

Area of Science:

Immunology
Medical Imaging
Rheumatology

Background:

Inflammatory arthritis leads to erosion and tissue necrosis.
Prognostic factors for arthritis initiation and severity are largely unknown.
Contrast-enhanced (CE)-magnetic resonance imaging (MRI) is a novel tool for studying arthritis pathogenesis.

Purpose of the Study:

To develop CE-MRI for mouse knee to identify prognostic factors in inflammatory arthritis.
To assess synovitis and draining lymph node (LN) function in TNF-Tg mice.
To investigate the relationship between LN function and arthritis severity.

Main Methods:

Developed dynamic CE-MRI for mouse knee imaging.
Quantified lymph node (LN) volume and enhancement for LN capacity (LNcap) measurement.

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Correlated LNcap with synovial volume and arthritis progression in TNF-Tg and wild-type (WT) mice.

Main Results:

TNF-Tg mice exhibited significantly larger LNs with greater enhancement compared to WT mice.
LNcap was 15-fold higher in TNF-Tg mice, decreasing significantly with anti-TNF therapy.
A negative correlation between LNcap and synovial volume indicated that lower LNcap accelerates arthritis progression.

Conclusions:

Enhanced lymphatic drainage, reflected by increased LNcap, plays a protective role in inflammatory arthritis.
LNcap is a potential prognostic biomarker for predicting arthritis severity.
CE-MRI provides valuable insights into the pathogenesis and potential therapeutic targets of inflammatory arthritis.