The decrease of regulatory T cells correlates with excessive activation and apoptosis of CD8+ T cells in HIV-1-infected typical progressors, but not in long-term non-progressors
AUTOR(ES)
Jiao, Yanmei
FONTE
Blackwell Science Inc
RESUMO
Persistent HIV infection results in a decrease in absolute counts of CD4+ CD25+ regulatory T cells (Treg). To investigate the role of decreased Treg counts in the regulation of excessive activation and apoptosis of CD8+ T cells in human immunodeficiency virus (HIV)-1 infection, we characterized Treg in 83 HIV-1-infected individuals, including 19 long-term non-progressors (LTNPs) and 51 typical progressors (TPs) who were treatment-naïve, and 13 AIDS patients on highly active antiretroviral therapy (HAART), of whom nine were complete responders (CRs) and the remaining four were non-responders (NRs) to the treatment. TPs but not LTNPs had a significant decrease in absolute counts of circulating Treg, which was inversely correlated with the activation and apoptosis of CD8+ T cells. Efficient HAART was found to increase Treg counts in CR patients and temper the excessive activation and apoptosis of CD8+ T cells. Moreover, isolated Treg significantly inhibited the spontaneous and anti-CD3-induced apoptosis of CD8+ T cells in a dose-dependent manner in vitro. Thus, our findings indicate that the decrease in Treg closely correlates with the increase in apoptotic CD8+ T cells and disease progression in chronic HIV-1 infection, and that Treg may play a key role in maintaining the balance between the amount and quality of CD8+ T cells in HIV-1 infection. Manipulation of Treg function may be a promising strategy for immune therapy of this disease.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2753909Documentos Relacionados
- Neonatal factors associated with HIV long term non-progressors in a cohort of vertically infected children in Rio de Janeiro, Brazil ("Peixe" Project)
- Efficacious control of cytomegalovirus infection after long-term depletion of CD8+ T lymphocytes.
- CD8+ T cells can mediate almost complete short-term and partial long-term immunity to rotavirus in mice.
- Induction of Long-Term Memory CD8+ T Cells for Recall of Viral Clearing Responses against Influenza Virus
- Study of the recognition of HIV-1 Gag and Nef epitopes by T lymphocytes in chronically infected HIV-1 Long-Term Non-Progressors