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J Virol, May 1998, p. 3711-3719, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Collaboration of Antibody and Inflammation in Clearance of Rabies Virus from the Central Nervous System

D. Craig Hooper,1 Kinjiro Morimoto,1 Michael Bette,2 Eberhard Weihe,2 Hilary Koprowski,1 and Bernhard Dietzschold1,*

Center for Neurovirology, Department of Microbiology and Immunology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107-6799,1 and Department of Anatomy and Cell Biology, University of Marburg, D-35033 Marburg, Germany2

Received 24 October 1997/Accepted 23 January 1998

To investigate the involvement of various cellular and humoral aspects of immunity in the clearance of rabies virus from the central nervous system, (CNS), we studied the development of clinical signs and virus clearance from the CNS in knockout mice lacking either B and T cells, CD8+ cytotoxic T cells, B cells, alpha/beta interferon (IFN-alpha /beta ) receptors, IFN-gamma receptors, or complement components C3 and C4. Following intranasal infection with the attenuated rabies virus CVS-F3, normal adult mice of different genetic backgrounds developed a transient disease characterized by loss of body weight and appetite depression which peaked at 13 days postinfection (p.i.). While these animals had completely recovered by day 21 p.i., mice lacking either B and T cells or B cells alone developed a progressive disease and succumbed to infection. Mice lacking either CD8+ T cells, IFN receptors, or complement components C3 and C4 showed no significant differences in the development of clinical signs by comparison with intact counterparts having the same genetic background. However, while infectious virus and viral RNA could be detected in normal control mice only until day 8 p.i., in all of the gene knockout mice studied except those lacking C3 and C4, virus infection persisted through day 21 p.i. Analysis of rabies virus-specific antibody production together with histological assessment of brain inflammation in infected animals revealed that clearance of CVS-F3 by 21 days p.i. correlated with both a strong inflammatory response in the CNS early in the infection (day 8 p.i.), and the rapid (day 10 p.i.) production of significant levels of virus-neutralizing antibody (VNA). These studies confirm that rabies VNA is an absolute requirement for clearance of an established rabies virus infection. However, for the latter to occur in a timely fashion, collaboration between VNA and inflammatory mechanisms is necessary.

* Corresponding author. Mailing address: Center for Neurovirology, Department of Microbiology and Immunology, Thomas Jefferson University, 1020 Locust St., Philadelphia, PA 19107-6799. Phone: (215) 503-4692. Fax: (215) 923-7145. E-mail: bdietzschold{at}reddi1.uns.tju.edu.

J Virol, May 1998, p. 3711-3719, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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Copyright © 1998 by the American Society for Microbiology. All rights reserved.