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The paraproteins in systemic capillary leak syndrome
W Zhang1, P W Ewan, P J Lachmann
1Molecular Immunopathology Unit, MRC Centre, Cambridge, UK.
Clinical and Experimental Immunology
|September 1, 1993
Summary
Systemic capillary leak syndrome (SCLS) involves plasma leakage, potentially linked to IgG paraproteins. However, these paraproteins did not directly cause capillary leak in lab tests, suggesting other factors are involved.
Area of Science:
- Immunology
- Hematology
- Rare Diseases
Background:
- Systemic capillary leak syndrome (SCLS) is a rare disorder with unknown pathogenesis.
- Episodes involve rapid plasma transfer from intravascular to extravascular spaces, causing collapse.
- Monoclonal IgG paraproteins are frequently observed in SCLS patients.
Purpose of the Study:
- To investigate the potential role of IgG paraproteins in SCLS pathogenesis.
- To determine if SCLS-associated paraproteins share common idiotypes.
- To assess the direct effect of paraproteins on endothelial cells.
Main Methods:
- Purification and characterization of monoclonal IgG paraproteins from SCLS patients.
- Generation of anti-idiotypic antibodies to assess paraprotein cross-reactivity.
- In vitro assays using cultured human endothelial cells, with and without inflammatory stimuli and neutrophils.
Main Results:
- Purified paraproteins were IgG1 with kappa light chains but varied in size and charge.
- Anti-idiotypic antibodies showed specific reactivity, indicating no shared idiotype among paraproteins.
- Paraproteins did not bind to or cause cytotoxicity in cultured endothelial cells.
Conclusions:
- SCLS-associated paraproteins do not share a common idiotype.
- The studied paraproteins did not directly induce capillary leak in vitro.
- Additional, unidentified factors are likely necessary for paraproteins to cause SCLS.