Peptide vaccines incorporating a ‘promiscuous’ T‐cell epitope bypass certain haplotype restricted immune responses and provide broad spectrum immunogenicity

表位 免疫原性 生物 主要组织相容性复合体 抗原 T细胞 人口 免疫系统 类毒素 病毒学 免疫学 免疫 医学 环境卫生
作者
Pravin T. P. Kaumaya,S. F. Kobs-Conrad,Young Hoon Seo,Hyosil Lee,Anne M. VanBuskirk,Ningguo Feng,John F. Sheridan,Vernon C. Stevens
出处
期刊:Journal of Molecular Recognition [Wiley]
卷期号:6 (2): 81-94 被引量:75
标识
DOI:10.1002/jmr.300060206
摘要

Abstract An ideal peptide vaccine should contain both B‐ and T‐cell epitopes. Recognition of antigen by B cells is highly dependent on the three‐dimensional conformation of the antigen whereas T cells recognize antigen only after it has been processed to release a peptide fragment which is bound to the major histocompatibility complex (MHC) class II molecule. However, T cells provide ‘help’ to B cells displaying the same processed, MHC‐restricted from of the antigen, demonstrating that the T‐cell response to a protein antigen is under genetic control. Thus, strategies for co‐inclusion of T cell ‘helper’ epitopes with the B‐cell determinant elicit immune responses that are in most cases genetically restricted to only one or a few alleles of the MHC with limited activity across divergent MHC class II haplotypes. This genetically restricted T cell stimulatory activity of peptides is a serious obstacle and consequently such constructs would be of limited practical value as a vaccine targeted to a majority of an outbred population. In the study described here, we have engineered tow peptides to encompass the sequences from the universally immunogenic tetanus toxoid (TT) epitope and the contraceptive vaccine candidate lactate dehydrogenase C 4 (LDH‐C 4 ). We demonstrate the feasibility of using ‘promiscuous’ T‐Cell epitopes colinearly constructed with a defined B‐cell epitope to induce high titer antipeptide IgG antibodies specific for native protein antigen LDH‐C 4 in several inbred strains of mice, outbred mice and rabbits. There appears to be a strong correlation between the capacity for the hybrid peptides to be stimulatory for the corresponding T cells in C57BL/6 (H‐2 b ) and C3H/HeJ (H‐2 k ) mice and their ability to be immunogenic. This correlation, however, appears to break down in H‐2 d strains of mice since no antibodies were detected in BALB/c and barely detectable levels of antibodies in B10.D2 although activated T cells were detectable. Conversely, high titers of antipeptide antibodies are elicited in some strains (B10.BR) (H‐2 k ); C57BL/10 (H‐2 k ) without detectable IL‐2 responses. Finally, we show that a determinant which was previously restricted to H‐2 k can be rendered immunogenic in H‐2 b with the ‘promiscuous’ TT epitope. Thus, certain haplotype‐restricted immune responses can be bypassed, setting forth the ground work for the design of a universal vaccine by broadening the effective response in a larger number of individuals typically of the genetically diverse outbred human population.
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