|
||
/
during Acute Infection with the
Noncytopathic Lymphocytic Choriomeningitis Virus
By


From the * Institute of Experimental Immunology, Department of Pathology, University Hospital of
Zürich, CH-8091 Zürich, Switzerland; and the The hematologic consequences of infection with the noncytopathic lymphocytic choriomeningitis virus (LCMV) were studied in wild-type mice with inherent variations in their interferon (IFN)-
Division of Hematology, Department of Internal
Medicine, University Hospital of Zürich, CH-8091 Zürich, Switzerland
/
responder ability and in mutant mice lacking
/
(IFN-
/
R0/0) or
IFN
(IFN-
R0/0) receptors. During the first week of infection, wild type mice demonstrated a
transient pancytopenia. Within a given genetic background, the extent of the blood cell abnormalities did not correlate with the virulence of the LCMV isolate but variations were detected
between different mouse strains; they were found to depend on their IFN-
/
responder phenotype. Whereas IFN-
R0/0 mice were comparable to wild-type mice, IFN-
/
R0/0 mice
exhibited unchanged peripheral blood values during acute LCMV infection. In parallel, the bone
marrow (BM) cellularity, the pluripotential and committed progenitor compartments were up
to 30-fold reduced in wild type and IFN-
R0/0, but remained unchanged in IFN-
/
R0/0
mice. Viral titers in BM 3 d after LCMV infection were similar in these mice, but antigen localization was different. Viral antigen was predominantly confined to stromal BM in normal
mice and IFN-
R0/0 knockouts, whereas, in IFN-
/
R0/0 mice, LCMV was detected in
>90% of megakaryocytes and 10-15% of myeloid precursors, but not in erythroblasts. Although IFN-
/
efficiently prevented viral replication in potentially susceptible hematopoietic
cells, even in overwhelming LCMV infection, unlimited virus multiplication in platelet and
myeloid precursors in IFN-
/
R0/0 mice did not interfere with the number of circulating
blood cells. Natural killer (NK) cell expansion and activity in the BM was comparable on day 3 after infection in mutant and control mice. Adaptive immune responses did not play a major
role because comparable kinetics of LCMV-induced pancytopenia and transient depletion of
the pluripotential and committed progenitor compartments were observed in CD80/0 and
CD40/0 mice, in mice depleted of NK cells, in lpr mice, and in perforin-deficient (P0/0) mice
lacking lytic NK cells. Thus, the reversible depression of hematopoiesis during early LCMV infection was not mediated by LCMV-WE-specific cytotoxic T lymphocyte, cytolysis, or secreted IFN-
from virally induced NK cells but was a direct effect of IFN-
/
.
This article has been cited by other articles:
| TABLE OF CONTENTS |
|