Monomeric and dimeric IgG fractions show differential reactivity against pathogen-derived antigens

Wymann, S; Zuercher, A W; Schaub, A; Bolli, R; Stadler, B M; Miescher, S M (2011). Monomeric and dimeric IgG fractions show differential reactivity against pathogen-derived antigens. Scandinavian journal of immunology, 74(1), pp. 31-41. Oxford: Wiley-Blackwell 10.1111/j.1365-3083.2011.02537.x

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Polyvalent Ig preparations, derived from the pooled plasma of thousands of healthy donors, contain a complex mix of both 'acquired' and natural antibodies directed against pathogens as well as foreign and self/auto antigens (Ag). Depending on their formulation, donor pool size, etc., liquid Ig preparations contain monomeric and dimeric IgG. The dimeric IgG fraction is thought to represent mainly idiotype-antiidiotype Ab pairs. Treatment of all IgG fractions at pH 4 effectively monomerizes the IgG dimers resulting in separated idiotype-antiidiotype Ab pairs and thus in a comparable F(ab')(2) binding site availability of the different IgG fractions. Previously, we identified an increased anti-self-reactivity within the monomerized dimer fraction. This study addressed if, among the different IgG fractions, an analogous preferential reactivity was evident in the response against different pathogen-derived protein and carbohydrate antigens. Therefore, we assessed the activity of total unseparated IgG, the monomeric and dimeric IgG fractions against antigenic structures of bacterial and viral antigens/virulence factors. All fractions showed similar reactivity to protein antigens except for exotoxin A of Pseudomonas aeruginosa, where the dimeric fraction, especially when monomerized, showed a marked increase in reactivity. This suggests that the production of antiidiotypic IgG antibodies contributes to controlling the immune response to certain categories of pathogens. In contrast, the monomeric IgG fractions showed increased reactivity towards pathogen-associated polysaccharides, classically regarded as T-independent antigens. Taken together, the differential reactivity of the IgG fractions seems to indicate a preferential segregation of antibody reactivities according to the nature of the antigen.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Institute for Immunology [discontinued]
UniBE Contributor:	Stadler, Beda Martin
ISSN:	0300-9475
Publisher:	Wiley-Blackwell
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 14:21
Last Modified:	05 Dec 2022 14:06
Publisher DOI:	10.1111/j.1365-3083.2011.02537.x
PubMed ID:	21338382
Web of Science ID:	000292254900004
URI:	https://boris.unibe.ch/id/eprint/6986 (FactScience: 212120)