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beta(2)-Microglobulin increases the expression of vascular cell adhesion molecule on human synovial fibroblasts

M I Jaradat1, C T Schnizlein-Bick, G K Singh

  • 1Department of Medicine, Indiana University School of Medicine, and Richard Roudebush VAMC, Indianapolis, Indiana, USA.

Kidney International
|April 25, 2001
PubMed
Abstract

Insights

beta(2)-microglobulin (beta(2)m) increases vascular cell adhesion molecule-1 (VCAM-1) expression in synovial fibroblasts, contributing to beta(2)m amyloidosis pathogenesis. This highlights the role of synovial fibroblasts in the disease.

Area of Science:

  • Rheumatology
  • Nephrology
  • Cell Biology

Background:

  • Beta(2)-microglobulin (beta(2)m) amyloidosis is a debilitating articular disease common in dialysis patients.
  • The pathogenesis is linked to adhesion molecules, similar to other arthritic conditions.
  • Synovial fibroblasts are investigated for their role in this inflammatory process.

Purpose of the Study:

  • To determine if beta(2)m directly upregulates vascular cell adhesion molecule-1 (VCAM-1) expression in synovial fibroblasts.
  • To examine the impact of advanced glycation end products (AGEs) on beta(2)m-induced VCAM-1 expression.
  • To investigate the functional consequence of VCAM-1 upregulation on immune cell adhesion.

Main Methods:

  • Human synovial fibroblasts were cultured and treated with beta(2)m, with and without AGE modification.
  • VCAM-1 expression was quantified using immunohistochemistry, flow cytometry, Western blotting, and Northern blotting.
  • Peripheral blood mononuclear cell adhesion to treated synovial fibroblasts was assessed.

Main Results:

  • Beta(2)m significantly increased VCAM-1 protein expression in a dose-dependent manner.
  • While beta(2)m increased VCAM-1 mRNA levels, AGE modification of beta(2)m did not alter this effect.
  • Synovial fibroblast adhesion of peripheral blood mononuclear cells was enhanced by beta(2)m.

Conclusions:

  • Beta(2)m directly stimulates VCAM-1 expression in synovial fibroblasts.
  • Synovial fibroblasts play a crucial role in the pathogenesis of beta(2)m amyloidosis.
  • Targeting VCAM-1 may offer a therapeutic strategy for beta(2)m amyloidosis.

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