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. 1989 May;76(2):178–183.

The specificity of anti-cardiolipin antibodies from syphilis patients and from patients with systemic lupus erythematosus.

S Mouritsen 1, M Høier-Madsen 1, A Wiik 1, O Orum 1, N Strandberg Pedersen 1
PMCID: PMC1541844  PMID: 2758694

Abstract

In order to elucidate the fine specificity of anti-cardiolipin antibodies (ACA) in patients with SLE compared to patients with syphilis (SY) various inhibition experiments were performed. Seven SLE sera and eight SY sera positive for ACA were diluted and preincubated with either cardiolipin VDRL-antigen, mitochondial particles, dsDNA, ssDNA or dilution buffer. The sera were subsequently assayed for residual ACA activity of IgG or IgM class using a sensitive ELISA technique. Significant inhibition of IgM ACA activity in SLE sera was found with cardiolipin, VDRL-antigen and mitochondrial particles. Cardiolipin inhibited binding to a significantly higher extent than the other antigens. In SY sera significant inhibition of the IgM ACA activity was found with all antigens used. The strongest inhibition was seen using VDRL-antigen. Inhibition of IgG ACA activity could only be clearly estimated in SY sera where VDRL-antigen was found to be a much stronger inhibitor than the rest, purified cardiolipin being the weakest. Only two out of seven SLE sera were IgG ACA positive which made a clear conclusion impossible but a strong inhibitory capability of pure cardiolipin and a weaker inhibition with VDRL-antigen was found. This study disclosed a difference between SLE and SY sera showing strong reactivity of ACA in SLE sera with purified cardiolipin, contrasting to ACA in SY sera which predominantly reacted with cardiolipin in the liposome environment, as found in the VDRL-antigen and in mitochondrial particles.

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Selected References

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