Parallel loss of myeloid and plasmacytoid dendritic cells from blood and lymphoid tissue in simian AIDS

被引:98
|
作者
Brown, Kevin N.
Trichel, Anita
Barratt-Boyes, Simon M. [1 ]
机构
[1] Univ Pittsburgh, Sch Med, Ctr Vaccine Res, Pittsburgh, PA 15261 USA
[2] Univ Pittsburgh, Sch Med, Div Lab Anim Resources, Pittsburgh, PA 15261 USA
[3] Univ Pittsburgh, Sch Med, Dept Immunol, Pittsburgh, PA 15261 USA
来源
JOURNAL OF IMMUNOLOGY | 2007年 / 178卷 / 11期
关键词
D O I
10.4049/jimmunol.178.11.6958
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
The loss of myeloid (mDC) and plasmacytoid dendritic cells (pDC) from the blood of HIV-infected individuals is associated with progressive disease. It has been proposed that DC loss is due to increased recruitment to lymph nodes, although this has not been directly tested. Similarly as in HIV-infected humans, we found that lineage-negative (Lin(-)) HLA-DR(+)CD11c(+)CD123(-) mDC and Lin-HLA-DR'CDI1c-CD123' pDC were lost from the blood of SIV-infected rhesus macaques with AIDS. In the peripheral lymph nodes of SIV-naive monkeys the majority of mDC were mature cells derived from skin that expressed high levels of HLA-DR, CD83, costimulatory molecules, and the Langerhans cell marker CD1a, whereas pDC expressed low levels of HLA-DR and CD40 and lacked costimulatory molecules, similar to pDC in blood. Surprisingly, both DC subsets were depleted from periphera! and mesenteric lymph nodes and spleens in monkeys with AIDS, although the activation status of the remaining DC subsets was similar to that of DC in health. In peripheral and mesenteric lymph nodes from animals with AIDS there was an accumulation of Lin(-)HLA-DRmoderate CD11c(-)CD123(-) cells that resembled monocytoid cells but failed to acquire a DC phenotype upon culture, suggesting they were not DC precursors. mDC and pDC from the lymphoid tissues of monkeys with AIDS were prone to spontaneous death in culture, indicating that apoptosis may be a mechanism for their loss in disease. These findings demonstrate that DC are lost from rather than recruited to lymphoid tissue in advanced SIV infection, suggesting that systemic DC depletion plays a direct role in the pathophysiology of AIDS.
引用
收藏
页码:6958 / 6967
页数:10
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