Human T cells recovered from human/Balb radiation chimeras are hypersensitive to human immunodeficiency virus type 1 infection.
AUTOR(ES)
Shapira-Nahor, O
RESUMO
Replication of human immunodeficiency virus type 1 (HIV-1) is regulated by virus-encoded regulatory proteins, as well as by a variety of cellular factors. Productive infection of human T lymphocytes by HIV-1 is dependent upon the activation status of the target cells. In general, short-term mitogenic stimulation of CD4 T cells is used to enhance infection of peripheral blood mononuclear cells (PBMC) in vitro. Recently, we demonstrated that adoptive transfer of human PBMC into lethally irradiated BALB/c mice, radioprotected with severe combined immunodeficiency (SCID) mouse bone marrow, leads to marked T-cell activation and proliferation. In the present study, we investigated the effect of such xenoactivation of human T cells on their susceptibility to HIV-1 infection. Human cells that were recovered from human/Balb radiation chimeras supported efficient replication of laboratory strains of HIV-1, as well as of HIV-1 clinical isolates. The multiplicity of infection required to attain effective virus replication in the recovered xenoactivated human cells was 10- to 100-fold lower than that needed for infection of short- or long-term phytohemagglutinin (PHA)-stimulated blasts or of various T-cell lines. Analysis of human cell surface activation markers has indicated that xenoactivation in the mouse, in contrast to in vitro stimulation with PHA, is associated with a marked downregulation of CD25 (interleukin 2 receptor). Our results demonstrate that human cells recovered from human/Balb radiation chimeras, which are hypersensitive to HIV-1 infection, differ from in vitro-stimulated cells in their activation status. Therefore, this system could be used to study host factors that participate in HIV-1 infection and replication in vitro and in vivo.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=191669Documentos Relacionados
- Isolation of mycobacterium-reactive CD1-restricted T cells from patients with human immunodeficiency virus infection.
- Plasmacytoid Dendritic Cells Are Highly Susceptible to Human Immunodeficiency Virus Type 1 Infection and Release Infectious Virus
- T Cells Expressing Activated LFA-1 Are More Susceptible to Infection with Human Immunodeficiency Virus Type 1 Particles Bearing Host-Encoded ICAM-1
- Human immunodeficiency virus type 1 infection of human placenta: potential route for fetal infection.
- Laboratory tests for detection of human immunodeficiency virus type 1 infection.