The role of in vitro-induced lymphocyte apoptosis in feline immunodeficiency virus infection: correlation with different markers of disease progression

Holznagel, E. et al. (1998) The role of in vitro-induced lymphocyte apoptosis in feline immunodeficiency virus infection: correlation with different markers of disease progression. Journal of Virology, 72(11), pp. 9025-9033.

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Human immunodeficiency virus infection is characterized by a progressive decline in the number of peripheral blood CD4+ T lymphocytes, which finally leads to AIDS. This T-cell decline correlates with the degree of in vitro-induced lymphocyte apoptosis. However, such a correlation has not yet been described in feline AIDS, caused by feline immunodeficiency virus (FIV) infection. We therefore investigated the intensity of in vitro-induced apoptosis in peripheral blood lymphocytes from cats experimentally infected with a Swiss isolate of FIV for 1 year and for 6 years and from a number of long-term FIV-infected cats which were coinfected with feline leukemia virus. Purified peripheral blood lymphocytes were either cultured overnight under nonstimulating conditions or stimulated with phytohemagglutinin and interleukin-2 for 60 h. Under stimulating conditions, the isolates from the infected cats showed significantly higher relative counts of apoptotic cells than did those from noninfected controls (1-year-infected cats, P = 0.01; 6-year-infected cats, P = 0.006). The frequency of in vitro-induced apoptosis was inversely correlated with the CD4+ cell count (P = 0.002), bright CD8+ cell count (P = 0.009), and CD4/CD8 ratio (P = 0.01) and directly correlated with the percentage of bright major histocompatibility complex class II-positive peripheral blood lymphocytes (P = 0.004). However, we found no correlation between in vitro-induced apoptosis and the viral load in serum samples. Coinfection with feline leukemia virus enhanced the degree of in vitro-induced apoptosis compared with that in FIV monoinfected cats. We concluded that the degree of in vitro-induced apoptosis was closely related to FIV-mediated T-cell depletion and lymphocyte activation and could be used as an additional marker for disease progression in FIV infection.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Willett, Professor Brian
Authors: Holznagel, E., Hofmann-Lehmann, R., Leutenegger, C.M., Allenspach, K., Huettner, S., Forster, U., Niederer, E., Joller, H., Willett, B.J., Hummel, U., Rossi, G.L., Schupbach, J., and Lutz, H.
Subjects:Q Science > QR Microbiology > QR180 Immunology
S Agriculture > SF Animal culture > SF600 Veterinary Medicine
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
Journal Name:Journal of Virology
Journal Abbr.:J. Virol.
ISSN (Online):1098-5514

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