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Strain-dependent variability in immune response to chicken riboflavin carrier protein in mice with different haplotypes

Subramanian, S and Rao, J and Jyothi, P and Adiga, PR (2000) Strain-dependent variability in immune response to chicken riboflavin carrier protein in mice with different haplotypes. In: Immunological Investigations, 29 (4). pp. 397-409.

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Active immunization of fertile female mice, rats and sub-human primates with linearized chicken riboflavin carrier protein (RCP) curtailed pregnancy suggesting that sequence-specific RCP antibodies interfere with fertilization/early embryo development. To investigate the genetic basis of variations in immunogenecity, antibody response to reduced and carboxymethylated RCP (RCM-RCP) was studied in different strains of mice of independent H-2 haplotypes. Among these, AKR (H-2k) were low or non-responders. Measurement of antibody titers in hyperimmune sera showed that among responder strains of mice, C57BL/6 (H-2b) and BALB/c (H-2d) generated higher levels of antibody compared to mice of SJLJ (H-2S). The relative affinities of these antibodies also varied depending upon the strain, with BALB/c mice showing highest affinity. Epitope mapping by pepscan ELISA revealed significant variability in determinant-specific antibody populations, with SJLJ strain lacking antibodies to N-terminal half of RCP sequence. However, four immunodominant sequential epitopes (residues 100-107, 134-141, 174-181 and 200-207) common to all the three strains of mice have been identified. Binding to these regions was not haplotype restricted although there were qualitative differences in recognition patterns. Present investigations have shown that site-specific antibodies directed towards any one of the four epitopic regions comprising of residues 3-24, 64-83, 130-147 and 200-219 in chicken RCP sequence effectively interfered with pregnancy establishment in female BALB/c mice. This implies the propensity of RCP antibodies to curtail pregnancy in the other two responder mouse strains also.

Item Type: Journal Article
Publication: Immunological Investigations
Publisher: Informa plc
Additional Information: Copyright of this article belongs to Informa plc.
Keywords: Carrier Proteins immunology;H 2 Antigens immunology;Pregnancy Animal immunology;Riboflavin metabolism
Department/Centre: Division of Biological Sciences > Molecular Reproduction, Development & Genetics
Date Deposited: 26 Oct 2007
Last Modified: 01 Mar 2012 05:36
URI: http://eprints.iisc.ac.in/id/eprint/12214

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