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Infection and Immunity, October 2000, p. 5724-5730, Vol. 68, No. 10
Division of Parasitology, National Institute
for Medical Research, London NW7 1AA, United Kingdom
Received 8 May 2000/Accepted 12 July 2000
Tumor necrosis factor alpha (TNF-
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Tumor Necrosis Factor Alpha p55 Receptor Is
Important for Development of Memory Responses to Blood-Stage
Malaria Infection
) is associated with malarial
pathology in both humans and mice. In Plasmodium chabaudi chabaudi (AS) infections, the production of TNF-
and reactive metabolites from macrophages are also thought to play a role in controlling acute parasitemia. Since many of the biological functions of TNF-
are effected through the p55 receptor (p55R), mice made defective in this receptor via a targeted gene disruption
(p55R
/
) have been used to study its involvement in the
immune response against P. chabaudi chabaudi and in the
pathology associated with this infection. In the absence of the p55R,
mice could overcome their primary infection, although higher
acute-blood-stage parasitemias and more significant recrudescences were
observed. Hypoglycemia, hypothermia, loss of erythrocytes, and loss of
body weight, which occur transiently in this infection, were
exacerbated by the lack of the p55R, but the differences were small,
suggesting that other factors affect these symptoms. In contrast to
wild-type (WT) mice, a second challenge infection in
p55R
/
mice resulted in a course of infection similar to
a primary infection. The malaria-specific immunoglobulin G antibody
response of p55R
/
mice was lower than that of WT mice
and was not increased by the second challenge infection. These data
suggest that p55R
/
mice do not develop an efficient
memory B-cell response against malarial infection and that this
antibody response is important in immunity to reinfection.
*
Corresponding author. Mailing address: Division of
Parasitology, National Institute for Medical Research, The Ridgeway,
Mill Hill, London NW7 1AA, United Kingdom. Phone: 44-208-959-3666, ext.
2588. Fax: 44-0208-913-8605. E-mail:
jlangho{at}nimr.mrc.ac.uk.
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