Monoclonal antibodies against the complement control protein factor H (beta 1 H).

Abstract:

:Two mouse monoclonal antibodies against the human complement control protein, Factor H (beta 1H), are described. The antibodies are both IgG - gamma 1 - subclass and are directed against different epitopes on the human Factor H molecule. One of the antibodies, MRC OX 24, increases the cofactor activity of Factor H in Factor I-mediated cleavage of soluble C3b. The second antibody, MRC OX 23, which has no effect alone, reduces the increase in cofactor activity observed in the presence of the first antibody. However, MRC OX 24 inhibits the binding of 125I-labelled Factor H to surface-bound C3b (EAC3b). Again MRC OX 23 alone does not have an effect but decreases the inhibition in 125I-labelled Factor H binding to EAC3b observed with MRC OX 24. These studies show clearly that the interaction of Factor H with soluble C3b is different to its interaction with surface-bound C3b. In an indirect immunoprecipitation system using these monoclonal antibodies, single-chain molecules of 150 000 mol.wt. are specifically precipitated from human serum and also from the sera of other primates - rhesus monkey, cynomolgus monkey, and African green monkey. There was no precipitation from sera of cow, pig, sheep, chick, or rabbit. Using a radioimmunoassay with radiolabelled monoclonal MRC OX 23, the concentration of Factor H in human plasma was determined.

journal_name

Biosci Rep

journal_title

Bioscience reports

authors

Sim E,Palmer MS,Puklavec M,Sim RB

doi

10.1007/BF01120205

subject

Has Abstract

pub_date

1983-12-01 00:00:00

pages

1119-31

issue

12

eissn

0144-8463

issn

1573-4935

journal_volume

3

pub_type

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