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J. Virol., Jan 1997, 383-391, Vol 71, No. 1
MT Lin, SA Stohlman and DR Hinton
Perforin-deficient [perforin (-/-)] mice were infected with two strains of
JHM virus (JHMV) to analyze the role of perforin-mediated cytotoxicity in
acute lethal and subacute central nervous system (CNS) infections. During
both acute and subacute infections, the overall mortality of the perforin
(-/-) mice was not different from that of the controls. Perforin (-/-) mice
survived longer than the controls, consistent with reduced morbidity. Both
strains of virus were cleared from the perforin (-/-) mice as in the
controls; however, the rate of clearance was delayed in the perforin (-/-)
mice, indicating that perforin-mediated cytolysis is involved in viral
clearance. The absence of perforin-mediated cytolysis did not prevent
encephalomyelitis or extensive demyelination. Cells undergoing apoptosis
were detected in the CNS of both the perforin (-/-) and control groups,
indicating that perforin is not essential for programmed cell death.
Neutralizing antibodies were not detected in either group of mice until day
9 postinfection, when the majority of the virus had been cleared. These
data further confirm the importance of cell-mediated cytotoxicity and
suggest that additional components of the immune response contribute to the
clearance of JHMV from the CNS.
Copyright © 1997, American Society for Microbiology
Mouse hepatitis virus is cleared from the central nervous systems of mice lacking perforin-mediated cytolysis
Department of Pathology, University of Southern California School of Medicine, Los Angeles 90033, USA.
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