Pre-existing immunity against swine-origin H1N1 influenza viruses in the general human population

被引:259
作者
Greenbaum, Jason A. [1 ]
Kotturi, Maya F. [1 ]
Kim, Yohan [1 ]
Oseroff, Carla [1 ]
Vaughan, Kerrie [1 ]
Salimi, Nima [1 ]
Vita, Randi [1 ]
Ponomarenko, Julia [2 ]
Scheuermann, Richard H. [3 ,4 ]
Sette, Alessandro [1 ]
Peters, Bjoern [1 ]
机构
[1] La Jolla Inst Allergy & Immunol, Div Vaccine Discovery, La Jolla, CA 92037 USA
[2] Univ Calif San Diego, San Diego Supercomp Ctr, La Jolla, CA 92093 USA
[3] Univ Texas SW Med Ctr Dallas, Dept Pathol, Dallas, TX 75390 USA
[4] Univ Texas SW Med Ctr Dallas, Div Biomed Informat, Dallas, TX 75390 USA
基金
美国国家卫生研究院;
关键词
databases; epitopes; meta-analysis; pandemic; T-CELL RESPONSE; A-VIRUS; H5N1; MICE; HEMAGGLUTININ; PROTECTION; INFECTION; ANTIBODY; VACCINE; TRANSMISSION;
D O I
10.1073/pnas.0911580106
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
A major concern about the ongoing swine-origin H1N1 influenza virus (S-OIV) outbreak is that the virus may be so different from seasonal H1N1 that little immune protection exists in the human population. In this study, we examined the molecular basis for pre-existing immunity against S-OIV, namely the recognition of viral immune epitopes by T cells or B cells/antibodies that have been previously primed by circulating influenza strains. Using data from the Immune Epitope Database, we found that only 31% (8/26) of B-cell epitopes present in recently circulating H1N1 strains are conserved in the S-OIV, with only 17% (1/6) conserved in the hemagglutinin (HA) and neuraminidase (NA) surface proteins. In contrast, 69% (54/78) of the epitopes recognized by CD8(+) T cells are completely invariant. We further demonstrate experimentally that some memory T-cell immunity against S-OIV is present in the adult population and that such memory is of similar magnitude as the pre-existing memory against seasonal H1N1 influenza. Because protection from infection is antibody mediated, a new vaccine based on the specific S-OIV HA and NA proteins is likely to be required to prevent infection. However, T cells are known to blunt disease severity. Therefore, the conservation of a large fraction of T-cell epitopes suggests that the severity of an S-OIV infection, as far as it is determined by susceptibility of the virus to immune attack, would not differ much from that of seasonal flu. These results are consistent with reports about disease incidence, severity, and mortality rates associated with human S-OIV.
引用
收藏
页码:20365 / 20370
页数:6
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