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M9550806.TXT
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1995-03-25
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Document 0806
DOCN M9550806
TI Ovine lentivirus (maedi-visna virus) protein expression in sheep
alveolar macrophages.
DT 9505
AU Lujan L; Begara I; Collie D; Watt NJ; Department of Veterinary
Pathology, Royal (Dick) School of; Veterinary Studies, University of
Edinburgh, UK.
SO Vet Pathol. 1994 Nov;31(6):695-703. Unique Identifier : AIDSLINE
MED/95167763
AB The expression of gag (p15, p25) and env gene products in ovine
lentivirus-infected cells was studied in 20 adult Texel ewes
seropositive to maedi-visna virus and 10 seronegative matched controls.
Bronchoalveolar lavage was performed to recover alveolar cell pools from
which cytocentrifuge preparations were made. Single and double
immunocytochemical techniques were applied to study viral replication
and coexpression of viral markers with markers for macrophages,
lymphocytes, and major histocompatibility complex (MHC) class II.
Aveolar macrophages of eight of 20 infected sheep (40%) were positive
for viral protein expression. The percentage of positive macrophages
varied from < 1% to 12% of the total population of macrophages. Viral
protein expression was not detected in lymphocytes or other cell types.
A relationship between virus-replicating macrophages and differential
expression of MHC class II molecules, upregulated in ovine lentivirus
infection, could not be established. Pathology was evaluated in nine
infected ewes. Animals with the highest levels of positive cells had
moderate or severe lymphoid interstitial pneumonia. However, sheep with
similar degrees of lesions had lower percentages of positive macrophages
or were negative for viral protein detection. These results support the
idea that a partial or even a complete loss in the restriction mechanism
of maedi-visna virus in lungs can occur in some individuals.
DE Animal Female Gene Products, env/*BIOSYNTHESIS Gene Products,
gag/*BIOSYNTHESIS HLA-DQ Antigens/BIOSYNTHESIS HLA-DR
Antigens/BIOSYNTHESIS Immunohistochemistry Macrophages,
Alveolar/PATHOLOGY/*VIROLOGY Pneumonia, Progressive Interstitial, of
Sheep/PATHOLOGY/*VIROLOGY Sheep Support, Non-U.S. Gov't Virus
Replication Visna-Maedi Virus/*METABOLISM/PHYSIOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).