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Bovine IgG can aggregate at conditions simulating pasteurization and binds to some human Fc gamma receptors.

Abstract：

:The ability of bovine IgG preparations to bind to the various distinct human leukocyte Fc gamma receptors was studied. In experiments using intact cells and isolated Fc gamma receptors, it was demonstrated that bovine IgG can bind to Fc gamma receptors of four human cell types but not to Fc gamma receptors of human neutrophils. 125I-labeled Fc gamma receptors purified on human IgG-Sepharose columns from human B and T lymphocytes, monocytes and eosinophils were able to rebind specifically to insolubilized bovine IgG. In contrast, radioiodinated human neutrophil Fc gamma receptors did not rebind to bovine IgG-Sepharose. A similar pattern of specificity was demonstrated in studies of the binding of 125I-labeled heat-aggregated bovine IgG to various human leukocyte populations. The labeled aggregated bovine IgG bound to peripheral blood mononuclear cells, to B cells from chronic lymphocytic leukemia patients and to macrophage-like U-937 cells, but bound poorly to normal human granulocytes. Labeled non-aggregated bovine IgG was not appreciably bound to any of the cell populations. Since bovine IgG in dietary sources is frequently exposed to heat, the effect of heating on the physical state and Fc-binding properties of bovine IgG was examined. The data show that heating bovine IgG at concns of 0.9-3.6 mg/ml at 63 degrees C for 30 min in neutral buffer causes aggregation of bovine immunoglobulin (10-16% aggregation) and increases the ability of bovine IgG preparations to bind to human Fc gamma receptors of intact cells. Gel filtration studies suggest the possibility that bovine IgG may also be aggregated during the pasteurization of raw milk.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Kulczycki A Jr

doi

10.1016/0161-5890(87)90144-1

subject

Has Abstract

pub_date

1987-03-01 00:00:00

pages

259-66

issue

3

eissn

0161-5890

issn

1872-9142

journal_volume

24

pub_type

杂志文章

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