A Role of Influenza Virus Exposure History in Determining Pandemic Susceptibility and CD8+ T Cell Responses

被引:25
作者
Quinones-Parra, Sergio M. [1 ]
Clemens, E. Bridie [1 ]
Wang, Zhongfang [1 ]
Croom, Hayley A. [1 ]
Kedzierski, Lukasz [2 ,3 ]
McVernon, Jodie [4 ]
Vijaykrishna, Dhanasekaran [5 ]
Kedzierska, Katherine [1 ]
机构
[1] Univ Melbourne, Peter Doherty Inst Infect & Immun, Dept Microbiol & Immunol, Parkville, Vic, Australia
[2] Univ Melbourne, Walter & Eliza Hall Inst Med Res, Parkville, Vic, Australia
[3] Univ Melbourne, Dept Med Biol, Parkville, Vic, Australia
[4] Univ Melbourne, Ctr Epidemiol & Biostat, Melbourne Sch Populat & Global Hlth, Melbourne, Vic, Australia
[5] Duke NUS Med Sch, Singapore, Singapore
基金
英国医学研究理事会; 美国国家卫生研究院;
关键词
A VIRUS; PROTECTIVE IMMUNITY; SEASONAL INFLUENZA; ANTIBODY-RESPONSES; SEQUENCE VARIATION; VIRAL ESCAPE; CROSS-REACT; H7N9; VIRUS; MEMORY; INFECTION;
D O I
10.1128/JVI.00349-16
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Novel influenza viruses often cause differential infection patterns across different age groups, an effect that is defined as heterogeneous demographic susceptibility. This occurred during the A/H2N2 pandemic, when children experienced higher influenza attack rates than adults. Since the recognition of conserved epitopes across influenza subtypes by CD8(+) cytotoxic T lymphocytes (CTLs) limit influenza disease, we hypothesized that conservation of CTL antigenic peptides (Ag-p) in viruses circulating before the pH2N2-1957 may have resulted in differential CTL immunity. We compared viruses isolated in the years preceding the pandemic (1941 to 1957) to which children and adults were exposed to viruses circulating decades earlier (1918 to 1940), which could infect adults only. Consistent with phylogenetic models, influenza viruses circulating from 1941 to 1957, which infected children, shared with pH2N2 the majority (similar to 89%) of the CTL peptides within the most immunogenic nucleoprotein, matrix 1, and polymerase basic 1, thus providing evidence for minimal pH2N2 CTL escape in children. Our study, however, identified potential CTL immune evasion from pH2N2 irrespective of age, within HLA-A* 03: 01(+) individuals for PB1471-L473V/N476I variants and HLA-B*15:01(+) population for NP404-414-V408I mutant. Further experiments using the murine model of B-cell-deficient mice showed that multiple influenza infections resulted in superior protection from influenza-induced morbidity, coinciding with accumulation of tissue-resident memory CD8(+) T cells in the lung. Our study suggests that protection against H2N2-1957 pandemic influenza was most likely linked to the number of influenza virus infections prior to the pandemic challenge rather than differential preexisting CTL immunity. Thus, the regimen of a CTL-based vaccine/vaccine-component may benefit from periodic boosting to achieve fully protective, asymptomatic influenza infection. IMPORTANCE Due to a lack of cross-reactive neutralizing antibodies, children are particularly susceptible to influenza infections caused by novel viral strains. Preexisting T cell immunity directed at conserved viral regions, however, can provide protection against influenza viruses, promote rapid recovery and better clinical outcomes. When we asked whether high susceptibility of children (compared to adults) to the pandemic H2N2 influenza strain was associated with immune evasion from T-cell immunity, we found high conservation within T-cell antigenic regions in pandemic H2N2. However, the number of influenza infections prior to the challenge was linked to protective, asymptomatic infections and establishment of tissue-resident memory T cells. Our study supports development of vaccines that prime and boost T cells to elicit cross-strain protective T cells, especially tissueresident memory T cells, for lifelong immunity against distinct influenza viruses.
引用
收藏
页码:6936 / 6947
页数:12
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