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Journal of Virology, October 1999, p. 8657-8668, Vol. 73, No. 10
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Bovine Herpesvirus 1 Can Infect CD4+ T
Lymphocytes and Induce Programmed Cell Death during Acute
Infection of Cattle
M. T. C.
Winkler,
A.
Doster, and
C.
Jones*
Department of Veterinary and Biomedical
Sciences, Center for Biotechnology, University of Nebraska,
Lincoln, Lincoln, Nebraska 68583-0905
Received 1 April 1999/Accepted 29 June 1999
Acute infection of cattle with bovine herpesvirus 1 (BHV-1)
represses cell-mediated immunity, which can lead to secondary bacterial
infections. Since BHV-1 can induce apoptosis of cultured lymphocytes,
we hypothesized that these virus-host interactions occur in cattle. To
test this hypothesis, we analyzed lymph nodes and peripheral blood
mononuclear cells (PBMC) after calves were infected with BHV-1. In situ
terminal deoxynucleotidyltransferase-mediated dUTP nick end-labeling
(TUNEL) staining of lymphoid tissues (pharyngeal tonsil, cervical,
retropharyngeal, and inguinal) was used to detect apoptotic cells.
Calves infected with BHV-1 for 7 days revealed increased apoptotic
cells near the corticomedullary junction in lymphoid follicles and in
the subcapsular region. Increased frequency of apoptotic cells was also
observed in the mucosa-associated lymphoid tissue lining the trachea
and turbinate. Immunohistochemistry of consecutive sections from
pharyngeal tonsil revealed that CD2+ T lymphocytes were
positive for the BHV-1 envelope glycoprotein gD. The location of these
CD2+ T lymphocytes in the germinal center suggested that
they were CD4+ T cells. Electron microscopy and TUNEL also
revealed apoptotic and herpesvirus-infected lymphocytes from this area.
Fluorescence-activated cell sorting analyses demonstrated that
CD4+ and CD8+ T cells decreased in lymph nodes
and PBMC after infection. The decrease in CD4+ T cells
correlated with an increase in apoptosis. CD4+ but not
CD8+ lymphocytes were infected by BHV-1 as judged by in
situ hybridization and PCR, respectively. Immediate-early (bovine ICP0)
and early (ribonucleotide reductase) transcripts were detected in PBMC
and CD4+ lymphocytes prepared from infected calves. In
contrast, a late transcript (glycoprotein C) was not consistently
detected suggesting productive infection was not efficient. Taken
together, these results indicate that BHV-1 can infect CD4+
T cells in cattle, leading to apoptosis and suppression of
cell-mediated immunity.
*
Corresponding author. Mailing address: Department of
Veterinary and Biomedical Sciences, Center for Biotechnology,
University of Nebraska, Lincoln Fair St. at East Campus Loop, Lincoln,
NE 68583-0905. Phone: (402) 472-1890. Fax: (402) 472-9690. E-mail: cj{at}unlinfo.unl.edu.
Journal of Virology, October 1999, p. 8657-8668, Vol. 73, No. 10
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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