Selective binding of heat- and antigen-aggregated IgG to Blue-Sepharose. Radioimmunoassay of circulating immune complexes.

Abstract:

:In an attempt to find a direct method for the determination of circulating immune complexes in pathological sera we studied the ability of Cibacron Blue 3GA covalently bound to Sepharose 4B to bind heat- or antigen-aggregated human IgG. Blue-Sepharose was found to bind significant amounts of aggregated IgG (about 1.5 mg/ml packed gel) but very low amounts of monomeric IgG (about 0.1 mg/ml gel). The ability of Blue-Sepharose to bind immune complexes was tested on human pathological sera containing variable amounts of circulating immune complexes. Using both a turbidimetric measurement and Barkas' method we found that Blue-Sepharose is able to remove a very high percent of circulating immune complexes (greater than 80%) from sera. Considering the above observations a new method is described for the direct determination of circulating immune complexes using Blue-Sepharose as serum adsorbent and either 125I-labeled protein A or 125I-labeled rabbit IgG anti-human IgG to demonstrate the binding of immune complexes.

journal_name

J Immunol Methods

authors

Dobre MA,Moţa G

doi

10.1016/0022-1759(83)90317-4

subject

Has Abstract

pub_date

1983-12-16 00:00:00

pages

207-15

issue

1-2

eissn

0022-1759

issn

1872-7905

pii

0022-1759(83)90317-4

journal_volume

65

pub_type

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