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J. Virol., Dec 1997, 9323-9332, Vol 71, No. 12
J Shen, SS T-To, L Schrieber and NJ King
Expression of E-selectin (ELAM-1, CD62E) on human umbilical vein
endothelial cells significantly increased 30 min postinfection with the
flavivirus West Nile virus (WNV), was maximal by 2 h postinfection, and
declined to baseline levels within 24 h. Expression of ICAM-1 (CD54) and
VCAM-1 (CD106) was significantly increased by 2 h and maximal at 4 h after
infection. P-selectin (CD62P) expression was unaffected by WNV.
Upregulation occurred earlier than that caused by tumor necrosis factor
alpha (TNF-alpha) or interleukin 1 (IL-1) and could not be inhibited by
neutralizing TNF-alpha, IL-1alpha, or alpha/beta interferon (IFN-
alpha/beta) antibodies, suggesting a direct, virus-mediated phenomenon.
TNF-alpha significantly enhanced WNV-induced increases in E-selectin, P-
selectin, ICAM-1, and VCAM-1 expression, while IFN-gamma enhanced WNV-
induced ICAM-1 expression. In contrast, IL-4 abrogated WNV-induced E-
selectin expression increases but acted in synergy with WNV to increase
P-selectin and VCAM-1 expression. WNV increased the expression of class I
and II major histocompatibility complex antigens (MHC-I and MHC-II,
respectively) at 24 and 72 h, respectively. IFN-gamma, TNF-alpha, or IL- 1
acted in synergy with WNV to produce greater increases in MHC-I expression
than WNV or cytokines alone, while IFN-alpha/beta or IL-4 had no effect.
MHC-II induction in cytokine-treated, WNV-infected cells was similar to
that caused by cytokines alone. Neutralizing IFN- alpha/beta antibody
inhibited WNV-induced MHC-I expression by 30% at 24 h and by 100% by 72 h.
The differential kinetics of modulation suggest sequential adhesion of
leukocyte subpopulations to infected endothelial cells, which may be
important in initial viral spread in vivo.
Copyright © 1997, American Society for Microbiology
Early E-selectin, VCAM-1, ICAM-1, and late major histocompatibility complex antigen induction on human endothelial cells by flavivirus and comodulation of adhesion molecule expression by immune cytokines
Department of Pathology, University of Sydney, New South Wales, Australia.
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