Massive infection and loss of memory CD4+ T cells in multiple tissues during acute SIV infection

Joseph J. Mattapallil, Daniel C. Douek, Brenna Hill, Yoshiaki Nishimura, Malcolm Martin and Mario Roederer ()
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Joseph J. Mattapallil: ImmunoTechnology Section
Daniel C. Douek: Human Immunology Section, Vaccine Research Center
Brenna Hill: Human Immunology Section, Vaccine Research Center
Yoshiaki Nishimura: Laboratory of Molecular Microbiology, NIAID, NIH
Malcolm Martin: Laboratory of Molecular Microbiology, NIAID, NIH
Mario Roederer: ImmunoTechnology Section

Nature, 2005, vol. 434, issue 7037, 1093-1097

Abstract: Abstract It has recently been established that both acute human immunodeficiency virus (HIV) and simian immunodeficiency virus (SIV) infections are accompanied by a dramatic and selective loss of memory CD4+ T cells predominantly from the mucosal surfaces. The mechanism underlying this depletion of memory CD4+ T cells (that is, T-helper cells specific to previously encountered pathogens) has not been defined. Using highly sensitive, quantitative polymerase chain reaction together with precise sorting of different subsets of CD4+ T cells in various tissues, we show that this loss is explained by a massive infection of memory CD4+ T cells by the virus. Specifically, 30–60% of CD4+ memory T cells throughout the body are infected by SIV at the peak of infection, and most of these infected cells disappear within four days. Furthermore, our data demonstrate that the depletion of memory CD4+ T cells occurs to a similar extent in all tissues. As a consequence, over one-half of all memory CD4+ T cells in SIV-infected macaques are destroyed directly by viral infection during the acute phase—an insult that certainly heralds subsequent immunodeficiency. Our findings point to the importance of reducing the cell-associated viral load during acute infection through therapeutic or vaccination strategies.

Date: 2005
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DOI: 10.1038/nature03501

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