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J. Virol., 11 1997, 8299-8306, Vol 71, No. 11
J Shisler, C Yang, B Walter, CF Ware and LR Gooding
Cytotoxic T cells use Fas (CD95), a member of the tumor necrosis factor
(TNF) receptor superfamily, to eliminate virus-infected cells by activation
of the apoptotic pathway for cell death. The adenovirus E3 region encodes
several proteins that modify immune defenses, including TNF-dependent cell
death, which may allow this virus to establish a persistent infection. Here
we show that, as an early event during infection, the adenovirus
E3-10.4K/14.5K complex selectively induces loss of Fas surface expression
and blocks Fas-induced apoptosis of virus-infected cells. Loss of surface
Fas occurs within the first 4 h postinfection and is not due to decreased
production of Fas protein. The decrease in surface Fas is distinct from the
10.4K/14.5K-mediated loss of the epidermal growth factor receptor on the
same cells, because intracellular stores of Fas are not affected. Further,
10.4K/14.5K, which was previously shown to protect against TNF cytolysis,
does not induce a loss of TNF receptor, indicating that this complex
mediates more than one function to block host defense mechanisms. These
results suggest yet another mechanism by which adenovirus modulates host
cytotoxic responses that may contribute to persistent infection by human
adenoviruses.
Copyright © 1997, American Society for Microbiology
The adenovirus E3-10.4K/14.5K complex mediates loss of cell surface Fas (CD95) and resistance to Fas-induced apoptosis
Department of Microbiology, Emory University School of Medicine, Atlanta, Georgia 30322, USA.
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