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J. Virol., Apr 1996, 2162-2169, Vol 70, No. 4
JL Davignon, P Castanie, JA Yorke, N Gautier, D Clement and C Davrinche
The control of latent cytomegalovirus (CMV) infections by the immune system
is poorly understood. We have previously shown that CD4+ T cells specific
for the human CMV major regulatory protein IE1 are frequent in latently
infected healthy blood donors. In order to learn about the possible role of
these cells, we have developed IE1-specific CD4+ T- cell clones and, in
this study, analyzed their epitope specificity and function in vitro. We
measured their cytokine production when stimulated with specific IE1
peptides or whole recombinant IE1 protein. Their cytokine profiles, as
deduced from gamma interferon (IFN-gamma), tumor necrosis factor alpha
(TNF-alpha), and interleukin-4 (IL-4) and IL-6 production, were of the Th0-
and Th1-like phenotypes. Supernatants from IE1-specific clones producing
IFN-gamma and TNF-alpha were shown to inhibit CMV replication in U373 MG
cells. This effect was due, as found by using cytokine-specific
neutralizing antibodies, mostly to IFN- gamma, which was secreted at higher
levels than TNF-alpha. To better assess the anti-CMV activity of cytokines,
recombinant IFN-gamma and TNF-alpha were used and shown to have a
synergistic effect on the inhibition of CMV replication and protein
expression. Thus, IE1- specific CD4+ T cells display in vitro anti-CMV
activity through cytokine secretion and may play a role in the control of
in vivo latent infections.
Copyright © 1996, American Society for Microbiology
Anti-human cytomegalovirus activity of cytokines produced by CD4+ T- cell clones specifically activated by IE1 peptides in vitro
Institut National de la Sante et de la Recherche Medicale U 395, Centre Hospitalier Universitaire Purpan, Toulouse, France.
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