Effect of plasma viremia on apoptosis and immunophenotype of dendritic cells subsets in acute SIVmac239 infection of Chinese rhesus macaques

• Published in: PloS one Vol. 6; no. 12; p. e29036
• Main Authors: Xia, Hou-Jun, Ma, Jian-Ping, Zhang, Gao-Hong, Han, Jian-Bao, Wang, Jian-Hua, Zheng, Yong-Tang
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 12.12.2011; Public Library of Science (PLoS)
• Subjects: Acquired immune deficiency syndrome; AIDS; Analysis; Animal models; Animals; Apoptosis; Apoptosis - immunology; Biology; CCR5 protein; CCR7 protein; CD1c antigen; CD4 antigen; CD80 antigen; CD86 antigen; Cell Movement - immunology; China; Dendritic cells; Dendritic Cells - immunology; Dendritic Cells - virology; Development and progression; Flow Cytometry; Fluorescence; HIV; Human immunodeficiency virus; Humans; Immunophenotyping; Infection; Infections; Infectious diseases; Laboratories; Macaca mulatta - blood; Macaca mulatta - immunology; Macaca mulatta - virology; Medical research; Medicine; Peripheral blood; Primates; R&D; Receptors, CCR5 - immunology; Receptors, CCR7 - immunology; Research & development; Simian Acquired Immunodeficiency Syndrome - blood; Simian Acquired Immunodeficiency Syndrome - immunology; Simian Acquired Immunodeficiency Syndrome - virology; Simian Immunodeficiency Virus - immunology; T cell receptors; Viremia; Viremia - blood; Viremia - immunology; Viremia - virology; Virus diseases; Zoology; China; Beijing China
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0029036

Non-human primates such as Chinese rhesus macaques (Ch Rhs) provide good animal models for research on human infectious diseases. Similar to humans, there are two principal subsets of dendritic cells (DCs) in the peripheral blood of Ch Rhs: myeloid DCs (mDCs) and plasmacytoid DCs (pDCs). In this study, two-color fluorescence-activated cell sorting (FACS) analyses were used to identify the main DC subsets, namely CD1c(+) mDCs and pDCs from Ch Rhs. Then, the apoptosis and immunophenotype changes of DCs subsets were first described during the acute phase of SIVmac239 infection. Both the DCs subsets showed decreased CD4 expression and enhanced CCR5 expression; in particular, those of pDCs significantly changed at most time points. Interestingly, the plasma viral loads were negatively correlated with CD4 expression, but were positively correlated with CCR5 expression of pDCs. During this period, both CD1c(+) mDCs and pDCs were activated by enhancing expressions of co-stimulatory molecules, accompanied with increase in CCR7. Either CD80 or CD86 expressed on CD1c(+) mDCs and pDCs was positively correlated with the plasma viral loads. Our analysis demonstrates that the pDCs were more prone to apoptosis after infection during the acute phase of SIVmac239 infection, which may be due to their high expressions of CD4 and CCR5. Both DCs subsets activated through elevating the expression of co-stimulatory molecules, which was beneficial in controlling the replication of SIV. However, a mere broad immune activation initiated by activated DCs may lead to tragic AIDS progression.