Abstract:
:Cellular activation plays an important role in retroviral replication. Previously, we have shown that CD4(+)CD25(+) T cells by the virtue of their partially activated phenotype represent ideal candidates for a productive feline immunodeficiency virus (FIV) infection. In the present study, we extended our previous observations with regard to FIV replication in CD4(+)CD25(+) and CD4(+)CD25(-) cells under different stimulation conditions. Both CD4(+)CD25(+) and CD4(+)CD25(-) cells remain latently infected in the absence of IL-2 or concanvalinA (ConA), respectively; harboring a replication competent provirus capable of reactivation several days post-infection. While CD4(+)CD25(+) cells require low levels of exogenous IL-2 and virus inputs for an efficient FIV replication, CD4(+)CD25(-) T cells can only be productively infected in the presence of either high concentrations of IL-2 or high virus titers, even in the absence of mitogenic stimulation. Interestingly, while high virus input activates CD4(+)CD25(-) cells to replicate FIV, it induces apoptosis in a high percentage of CD4(+)CD25(+) T cells. High IL-2 concentrations but not high virus inputs lead to surface upregulation of CD25 and significant cellular proliferation in CD4(+)CD25(-) cells. These results suggest that CD4(+)CD25(+) and CD4(+)CD25(-) T cells have different activation requirements which can be modulated by both viral and cytokine stimuli to reach threshold activation levels in order to harbor a productive FIV infection. This holds implications in vivo for CD4(+)CD25(+) and CD4(+)CD25(-) cells to serve as potential reservoirs of a productive and latent FIV infection.
journal_name
Virologyjournal_title
Virologyauthors
Joshi A,Garg H,Tompkins MB,Tompkins WAdoi
10.1016/j.virol.2005.02.016subject
Has Abstractpub_date
2005-05-10 00:00:00pages
212-21issue
2eissn
0042-6822issn
1096-0341pii
S0042-6822(05)00138-8journal_volume
335pub_type
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