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    CMV immune evasion and manipulation of the immune system with aging.

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    Authors
    Jackson, Sarah E
    Redeker, Anke
    Arens, Ramon
    van Baarle, Debbie
    van den Berg, Sara P H
    Benedict, Chris A
    Čičin-Šain, Luka
    Hill, Ann B
    Wills, Mark R
    Type
    Article
    Language
    en
    
    Metadata
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    Title
    CMV immune evasion and manipulation of the immune system with aging.
    Published in
    Geroscience 2017, 39(3):273-91
    Publiekssamenvatting
    Human cytomegalovirus (HCMV) encodes numerous proteins and microRNAs that function to evade the immune response and allow the virus to replicate and disseminate in the face of a competent innate and acquired immune system. The establishment of a latent infection by CMV, which if completely quiescent at the level of viral gene expression would represent an ultimate in immune evasion strategies, is not sufficient for lifelong persistence and dissemination of the virus. CMV needs to reactivate and replicate in a lytic cycle of infection in order to disseminate further, which occurs in the face of a fully primed secondary immune response. Without reactivation, latency itself would be redundant for the virus. It is also becoming clear that latency is not a totally quiescent state, but is characterized by limited viral gene expression. Therefore, the virus also needs immune evasion strategies during latency. An effective immune response to CMV is required or viral replication will cause morbidity and ultimately mortality in the host. There is clearly a complex balance between virus immune evasion and host immune recognition over a lifetime. This poses the important question of whether long-term evasion or manipulation of the immune response driven by CMV is detrimental to health. In this meeting report, three groups used the murine model of CMV (MCMV) to examine if the contribution of the virus to immune senescence is set by the (i) initial viral inoculum, (ii) inflation of T cell responses, (iii) or the balance between functionally distinct effector CD4+ T cells. The work of other groups studying the CMV response in humans is discussed. Their work asks whether the ability to make immune responses to new antigens is compromised by (i) age and HCMV carriage, (ii) long-term exposure to HCMV giving rise to an overall immunosuppressive environment and increased levels of latent virus, or (iii) adapted virus mutants (used as potential vaccines) that have the capacity to elicit conventional and unconventional T cell responses.
    DOI
    10.1007/s11357-017-9986-6
    PMID
    28647908
    URI
    http://hdl.handle.net/10029/620965
    ae974a485f413a2113503eed53cd6c53
    10.1007/s11357-017-9986-6
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