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Immune material processing by phagocyte cell system in cryoglobulinemia.

D Roccatello1, G Mazzucco, R Coppo

  • 1Istituto di Nefro-Urologia, Università di Torino, Italy.

Clinical Nephrology
|September 1, 1991
PubMed
Summary

Cryoglobulinemia patients with severe symptoms show impaired splenic macrophage function, specifically in clearing antibody-coated red blood cells (E-IgG). This defect correlates with disease activity and may involve cryoglobulin-induced phagocytosis inhibition.

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Area of Science:

  • Immunology
  • Hematology
  • Nephrology

Background:

  • Cryoglobulinemia is associated with immune complex deposition and potential organ damage.
  • Splenic macrophage dysfunction may contribute to the pathogenesis of cryoglobulinemia, particularly in severe cases.

Purpose of the Study:

  • To investigate the functional status of splenic macrophages in cryoglobulinemia patients.
  • To identify the mechanisms underlying impaired phagocytosis of antibody-coated erythrocytes (E-IgG) in cryoglobulinemia.

Main Methods:

  • Assessed E-IgG clearance rates in patients with varying disease severity.
  • Analyzed peripheral blood phagocytes (PBP) for cell-bound immune material, surface receptor expression (HLA II, CR1, FcR), and cryoglobulin internalization via electron microscopy.
  • Measured chemiluminescence (CL) production in response to various stimuli and assessed cryoglobulin-induced inhibition of E-IgG phagocytosis.

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Main Results:

  • Impaired E-IgG clearance was observed in 7/8 patients with severe urinary abnormalities and systemic symptoms.
  • Patients' PBP showed increased cell-bound immune material and reduced CL production, particularly with n-FMLP stimulation.
  • Cryoglobulins significantly inhibited E-IgG phagocytosis, despite normal cryoglobulin internalization capacity observed via EM.

Conclusions:

  • Splenic macrophage dysfunction, evidenced by impaired E-IgG clearance and reduced CL, is linked to severe cryoglobulinemia.
  • Cryoglobulin-induced inhibition of phagocytosis, possibly due to saturation mechanisms or intracellular defects, contributes to the observed functional impairment.