Only a Matter of Time
In the fast-paced world of scientific research, most conclusions are drawn on few—or single—time points or with animal models that may accelerate—but not always accurately reproduce—disease progression. Longitudinal analyses are rare. Indeed, this is the case in influenza virus research, where it is thought that previous infections influence the outcome of subsequent infections, but little is actually known about how sequential exposures to antigenically diverse viruses affect the antibody response to influenza A viruses. Now, Miller et al. use samples obtained over a 20-year period from 40 individuals involved in the Framingham Heart Study to look at antibody titers to seasonal and pandemic influenza strains over time.
The authors find longitudinal increases in neutralizing antibodies to previously encountered seasonal and pandemic flu strains. This increase was not age-dependent because it was observed against strains encountered later in life as well as in earlier exposures. Titers to the more conserved hemagglutinin stalk domain increased modestly as well, but no neutralizing antibody titer increase was observed against a more antigenically stable virus (human cytomegalovirus). These results suggest that antigenic variation may drive the hierarchical humoral immune response to influenza strains. The contribution of antigenic variation to antibody titers to the conserved stalk region supports the pursuit of vaccine strategies that increase exposure to antigenically diverse strains of influenza.
Antigenic diversity shapes immunity in distinct and unexpected ways. This is particularly true of the humoral response generated against influenza A viruses. Although it is known that immunological memory developed against previously encountered influenza A virus strains affects the outcome of subsequent infections, exactly how sequential exposures to antigenically variant viruses shape the humoral immune response in humans remains poorly understood. To address this important question, we performed a longitudinal analysis of antibody titers against various pandemic and seasonal strains of influenza virus spanning a 20-year period (1987 to 2008) with samples from 40 individuals (birth dates, 1917 to 1952) obtained from the Framingham Heart Study. Longitudinal increases in neutralizing antibody titers were observed against previously encountered pandemic H2N2, H3N2, and H1N1 influenza A virus strains. Antibody titers against seasonal strains encountered later in life also increased longitudinally at a rate similar to that against their pandemic predecessors. Titers of cross-reactive antibodies specific to the hemagglutinin stalk domain were also investigated because they are influenced by exposure to antigenically diverse influenza A viruses. These titers rose modestly over time, even in the absence of major antigenic shifts. No sustained increase in neutralizing antibody titers against an antigenically more stable virus (human cytomegalovirus) was observed. The results herein describe a role for antigenic variation in shaping the humoral immune compartment and provide a rational basis for the hierarchical nature of antibody titers against influenza A viruses in humans.
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Science Translational Medicine
Volume 5 | Issue 198
Copyright © 2013, American Association for the Advancement of Science.
Received: 23 May 2013
Accepted: 19 June 2013
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We thank the FHS (http://www.framinghamheartstudy.org/participants/offspring.html) for the donation of samples and C. Wang for providing excellent technical support. Funding: M.S.M. was supported by a Canadian Institutes of Health Research Postdoctoral Fellowship. T.J.G. was supported in part by U.S. Public Health Service Institutional Research Training Award T32-AI07647 and a Helmsley Trust Fellowship. F.K. was partially supported by an Erwin Schrödinger Fellowship (J 3232) from the Austrian Science Fund. This work was supported by PATH and by NIH (HHSN26620070010C to P.P. and AI085306 to C.F.B.) and an American Heart Association grant to D.T. Author contributions: All authors were involved in the design of experiments and analysis of data. M.S.M., T.J.G., F.K., and L.C.A. performed the experiments. M.S.M. and P.P. wrote the manuscript. Competing interests: The authors declare that they have no competing interests.
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