Abstract
We have generated a single-chain antibody which recognizes murine CR1/2 and carries a genetically fused influenza hemagglutinin derived peptide. Theoretically such a construct is able to crosslink the B cell antigen receptor and CR1/2 on peptide specific B cells. The construct was able to reach its CR1/2 positive target cells, yet intraperitoneal delivery of the construct elicited an IgM response only slightly exceeding that induced by the free peptide. Providing T cell help by the injection of peptide specific lymphocytes did not alter the response in essence, that is anti-peptide IgG was not detectable even after booster immunizations. When used as a booster vaccine following injection of the peptide in adjuvant, the construct even inhibited the development of IgG1 and IgG3 anti-peptide antibodies.
These data indicate that although targeting of antigen to CR1/2 on B cells can enhance transient proliferation or differentiation of antigen specific B cells it cannot induce strong, longlasting humoral immune responses. Furthermore, CR1/2 targeting constructs may negatively influence an ongoing immune reaction.
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Prechl, J. et al. (2007). Murine CR1/2 Targeted Antigenized Single-Chain Antibody Fragments Induce Transient Low Affinity Antibodies and Negatively Influence an Ongoing Immune Response. In: Lambris, J.D. (eds) Current Topics in Innate Immunity. Advances in Experimental Medicine and Biology, vol 598. Springer, New York, NY. https://doi.org/10.1007/978-0-387-71767-8_15
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DOI: https://doi.org/10.1007/978-0-387-71767-8_15
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