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Journal of Virology, April 2000, p. 3338-3344, Vol. 74, No. 7
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Tumor Necrosis Factor Alpha-Deficient, but Not
Interleukin-6-Deficient, Mice Resist Peripheral Infection with
Scrapie
Neil A.
Mabbott,1,*
Alun
Williams,1,
Christine F.
Farquhar,1
Manolis
Pasparakis,2
Giorgos
Kollias,2 and
Moira E.
Bruce1
Neuropathogenesis Unit, Institute for Animal
Health, Edinburgh EH9 3JF, Scotland, United
Kingdom,1 and Hellenic Pasteur
Institute, 115 21 Athens, Greece2
Received 21 October 1999/Accepted 4 January 2000
In most peripheral infections of rodents and sheep with scrapie,
infectivity is found first in lymphoid tissues and later in the central
nervous system (CNS). Cells within the germinal centers (GCs) of the
spleen and lymph nodes are important sites of extraneural replication,
from which infection is likely to spread to the CNS along peripheral
nerves. Here, using immunodeficient mice, we investigate the identity
of the cells in the spleen that are important for disease propagation.
Despite possessing functional T and B lymphocytes, tumor necrosis
factor alpha-deficient (TNF-
/
) mice lack GCs and
follicular dendritic cell (FDC) networks in lymphoid tissues. In
contrast, lymphoid tissues of interleukin-6-deficient (IL-6
/
) mice possess FDC networks but have impaired
GCs. When the CNSs of TNF-
/
, IL-6
/
,
and wild-type mice were directly challenged with the ME7 scrapie strain, 100% of the mice were susceptible, developing disease after
closely similar incubation periods. However, when challenged peripherally (intraperitoneally), most TNF-
/
mice
failed to develop scrapie up to 503 days postinjection. All wild-type
and IL-6
/
mice succumbed to disease approximately 300 days after the peripheral challenge. High levels of scrapie infection
and the disease-specific isomer of the prion protein,
PrPSc, were detectable in spleens from challenged wild-type
and IL-6
/
mice but not from TNF-
/
mice. Histopathological analysis of spleen tissue demonstrated heavy
PrP accumulations in direct association with FDCs in challenged wild-type and IL-6
/
mice. No PrPSc
accumulation was detected in spleens from TNF-
/
mice. We conclude that, for the ME7 scrapie strain, mature FDCs are
critical for replication in lymphoid tissues and that in their absence,
neuroinvasion following peripheral challenge is impaired.
*
Corresponding author. Mailing address: Institute for
Animal Health, Neuropathogenesis Unit, Ogston Building, West Mains Rd., Edinburgh EH9 3JF, Scotland, United Kingdom. Phone: 44 131 667 5204. Fax: 44 131 668 3872. E-mail:
neil.mabbott{at}bbsrc.ac.uk.

Present address: Department of Veterinary Pathology, Glasgow
University Veterinary School, Glasgow G61 1QH, Scotland, United
Kingdom.
Journal of Virology, April 2000, p. 3338-3344, Vol. 74, No. 7
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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