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Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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Intercellular adhesion molecule-1/leukocyte function associated antigen-1-mediated and complement receptor type

T Ootaka1, T Saito, J Soma

  • 1Second Department of Internal Medicine, Tohoku University School of Medicine, Sendai, Japan.

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
|July 1, 1996
PubMed

Insights

Intercellular adhesion molecule-1 (ICAM1) and membrane cofactor protein (MCP) interactions with leukocyte function associated antigen-1 (LFA1) and C3bi receptors correlate with immune cell infiltration and proteinuria in IgA nephropathy patients.

Area of Science:

  • Nephrology
  • Immunology
  • Cell Biology

Background:

  • Immunoglobulin A nephropathy (IgAN) is a leading cause of glomerulonephritis.
  • Immune cell infiltration plays a critical role in IgAN pathogenesis.
  • Adhesion molecules and complement receptors are implicated in immune cell recruitment.

Purpose of the Study:

  • To investigate the role of intercellular adhesion molecule-1 (ICAM1) and membrane cofactor protein (MCP) in glomerular immune cell infiltration in IgAN.
  • To examine the correlation between ICAM1, MCP, and immune cell markers (LFA1alpha, CR4) with proteinuria.
  • To assess the dynamic changes of these markers in relation to disease progression.

Main Methods:

  • Indirect immunoperoxidase staining on 43 repeated renal biopsy specimens from IgAN patients.
  • Quantification of glomerular ICAM1, MCP, leukocyte function associated antigen-1 alpha (LFA1alpha)+ cells, and complement receptor type 4 (CR4)+ cells.
  • Evaluation of 24-hour urine protein levels at biopsy time points.

Main Results:

  • Glomerular LFA1alpha+ cell infiltration positively correlated with ICAM1 expression (r=0.494, P<0.0001).
  • CR4+ cells correlated with MCP expression (r=0.405, P<0.0001) and both cell types correlated with urine protein (r=0.426, P<0.001 and r=0.478, P<0.0001).
  • Changes in ICAM1/MCP and LFA1alpha+/CR4+ cell infiltration correlated with changes in urine protein, suggesting their involvement in disease progression.

Conclusions:

  • ICAM1/LFA1 and MCP/C3biR interactions likely cooperate in persistent glomerular immune cell infiltration in IgAN.
  • LFA1alpha+ and CR4+ cells contribute to the induction of proteinuria in IgAN.
  • These findings highlight potential therapeutic targets for mitigating IgAN progression and proteinuria.

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