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Secretion by Type 2 Predendritic Cells Up-Regulates MHC Class I in the HIV-1-Infected Thymus1

,
*
Gladstone Institute of Virology and Immunology,
Biomedical Sciences Graduate Program, and Departments of
Medicine and
Microbiology and Immunology, University of California, San Francisco, CA 94143
The ability of HIV-1 to evade the host immune response leads to the
establishment of chronic infection. HIV-1 has been reported to
up-regulate MHC I molecules on the surface of thymocytes from
HIV-1-infected thymus. We demonstrate in this study that HIV-1
up-regulates MHC I on both HIV-1-infected and uninfected thymocytes in
a manner that is independent of Nef, proportional to viral replication,
and entirely mediated by IFN-
. IL-3R
+ type 2
predendritic cells (preDC2) resident in the thymic medulla secrete
IFN-
, which acts on IFN-
R-expressing immature thymocytes to
induce MHC I expression. Furthermore, thymic preDC2 are permissive for
HIV-1 infection and positive for intracellular p24. These data
demonstrate the ability of IFN-
secreted by preDC2 to induce MHC I
up-regulation in the HIV-1-infected human thymus.
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