Thymic dendritic cells are primary targets for the oncogenic virus SL3-3

被引:7
|
作者
Uittenbogaart, CH [1 ]
Law, W
Leenen, PJM
Bristol, G
van Ewijk, W
Hays, EF
机构
[1] Univ Calif Los Angeles, Sch Med, Dept Immunol & Microbiol, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Sch Med, Dept Pediat, Los Angeles, CA 90095 USA
[3] Univ Calif Los Angeles, Sch Med, Dept Med, Los Angeles, CA 90095 USA
[4] Univ Calif Los Angeles, Sch Med, Ctr Interdisciplinary Res Immunol Dis, Los Angeles, CA 90095 USA
[5] Univ Calif Los Angeles, Sch Med, Jonsson Comprehens Canc Ctr, Los Angeles, CA 90095 USA
[6] Erasmus Univ, Dept Immunol, NL-3000 DR Rotterdam, Netherlands
关键词
D O I
10.1128/JVI.72.12.10118-10125.1998
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The murine retrovirus SL3-3 causes malignant transformation of thymocytes and thymic lymphoma in mice of the AKR and NFS strains when they are inoculated neonatally. The objective of the present study was to identify the primary target cells for the virus in the thymuses of these mice. Immunohistochemical studies of the thymus after neonatal inoculation of the SL3-3 virus showed that cells expressing the viral envelope glycoprotein (gp70(+) cells) were first seen at 2 weeks of age. These virus-expressing cells were found in the cortex and at the corticomedullary junction in both mouse strains. The gp70(+) cells had the morphology and immunophenotype of dendritic cells. They lacked macrophage-specific antigens. Cell separation studies showed that bright gp70(+) cells were detected in a fraction enriched for dendritic cells. At 3 weeks of age, macrophages also expressed gp70. At that time, both gp70(+) dendritic cells and macrophages were found at the corticomedullary junction and in foci in the thymic cortex. At no time during this 3-week period was the virus expressed in cortical and medullary epithelial cells or in thymic lymphoid cells. Infectious cell center assays indicated that cells expressing infectious virus were present in small numbers at 2 weeks after inoculation but increased at 5 weeks of age by several orders of magnitude, indicating virus spread to the thymic lymphoid cells. Thus, at 2 weeks after neonatal inoculation of SL3-3, thymic dendritic cells are the first cells to express the virus. At 3 weeks of age, macrophages also express the virus. In subsequent weeks, the virus spreads to the thymocytes. This pathway of virus expression in the thymus allows the inevitable provirus integration in a thymocyte that results in a clonal lymphoma.
引用
收藏
页码:10118 / 10125
页数:8
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