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Production of mouse monoclonal antibodies that detect distinct neoantigenic epitopes on bound C3b and iC3b but not on the corresponding soluble fragments.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
1987 (English)In: Molecular Immunology, ISSN 0161-5890, E-ISSN 1872-9142, Vol. 24, no 5, 487-494 p.Article in journal (Refereed) Published
Abstract [en]

Polyclonal antibodies raised in rabbits against sodium dodecyl sulphate (SDS)-denatured and reduced human complement factor C3 have in recent studies been shown to lack any reactivity towards native C3 but to react with antigens distinctly expressed by SDS-denatured C3 (C3(D) antigens). These antigens are also neoantigens specific for physiologically bound C3 and appear to be involved in the interaction of C3 with other complement components. The present investigation deals with production of mouse monoclonal antibodies against C3(D) antigens. To accomplish this two different immunization and screening procedures employing C3 preparations of known C3(D) expression were tested. From each group 14 clones were randomly selected and the reactivity of these and of a control group of 14 additional monoclonal anti-human C3 antibody preparations raised against native soluble C3 and C3b, was investigated in ELISA and immunoblotting. The procedure which employed denatured reduced C3 as both immunogen as well as screening antigen was shown to be superior for obtaining anti-C3(D) antibodies. Altogether 16 clones producing antibodies against C3(D) antigens were found. All of them bound to the C3 alpha-chain, 14 to C3c and one to C3d, and eight monoclonal antibodies specific for neoantigens of C3(D) type on bound C3b and/or iC3b were obtained. The majority of these detected neoantigenic epitopes in the 25,000 N-terminal fragment of the C3 alpha-chain specifically exposed by bound iC3b, but one monoclonal antibody was specific for the 36,000 C-terminal alpha-chain fragment and for both bound C3b and iC3b.

Place, publisher, year, edition, pages
1987. Vol. 24, no 5, 487-494 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-265381PubMedID: 2443836OAI: oai:DiVA.org:uu-265381DiVA: diva2:865419
Available from: 2015-10-28 Created: 2015-10-28 Last updated: 2017-12-01

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