Journal of Virology, April 2001, p. 3427-3434, Vol. 75, No. 7
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.7.3427-3434.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Unité de Neurovirologie et Régénération du Système Nerveux, Institut Pasteur, Paris, France
Received 1 November 2000/Accepted 10 January 2001
Following brain infection, the Challenge Virus Standard
strain of rabies virus infects the retina. Rabies virus ocular
infection induces the infiltration of neutrophils and predominantly T
cells into the eye. The role of tumor necrosis factor alpha
(TNF-
)-lymphotoxin signaling in the control of rabies virus ocular
infection and inflammatory cell infiltration was assessed using mice
lacking the p55 TNF-
receptor (p55TNFR
/
mice). The
incidence of ocular disease and the intensity of retinal infection were
greater in p55TNFR
/
mice than in C57BL/6 mice: the
aggravation correlated with less neutrophil and T-cell infiltration.
This indicates that cellular infiltration is under the control of the
p55 TNF-
receptor and suggests that inflammatory cells may protect
the eye against rabies virus ocular infection. The role of T cells
following rabies virus ocular disease was assessed by comparison of
rabies virus infection in nude mice with their normal counterparts.
Indeed, the incidence and severity of the rabies virus ocular disease
were higher in athymic nude mice than in BALB/c mice, indicating that T
lymphocytes are protective during rabies virus ocular infection.
Moreover, few T cells and neutrophils underwent apoptosis in rabies
virus-infected retina. Altogether, these data suggest that T
lymphocytes and neutrophils are able to enter the eye, escape the
immune privilege status, and limit rabies virus ocular disease. In
conclusion, rabies virus-mediated eye disease provides a new model for
studying mechanisms regulating immune privilege during viral infection.
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