Enhanced expression of CTLA‐4 (CD152) on CD4+ T cells in HIV infection
Enhanced expression of CTLA‐4 (CD152) on CD4+ T cells in HIV infection
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HIV 感染中 CD4+ T 细胞上 CTLA-4 (CD152) 的表达增强
DOI:
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发表时间:
1999
影响因子:
4.6
通讯作者:
Bröker
中科院分区:
文献类型:
--
作者:
Steiner;Waase;Raú;Dietrich;Fleischer;Bröker
CTLA‐4 (CD152) is a surface molecule of activated T cells with sequence homology to CD28. Both molecules bind to the same ligands, B7.1 (CD80) and B7.2 (CD86) but have antagonistic functions. While CD28 is an important costimulator, CTLA‐4 has an essential inhibitory function in maintaining the homeostasis of the immune system. Down‐ regulation of CD28 predominantly on CD8+ T cells has been described in HIV infection, but analysis of CTLA‐4 is complicated by its low expression levels. Here we have used potent signal enhancement to study CTLA‐4 on peripheral blood mononuclear cells (PBMC) during HIV infection. CTLA‐4 was expressed only on T cells. Expression levels were significantly increased selectively on CD4+ T cells during all stages of HIV infection, while CTLA‐4 expression on CD8+ T cells was always low. In contrast, after stimulation with the mitogen phytohaemagglutinin (PHA), CTLA‐4 levels were strongly increased on T cells from controls but in T cells from HIV patients this response was severely impaired. Our data suggest that in HIV infection CD4+ and CD8+ T cells may be less responsive to B7 costimuli due to two different mechanisms: increase in CTLA‐4 expression by CD4+ cells and down‐regulation of CD28 by CD8+ cells.
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影响因子:
32.4
作者:
TIVOL, EA;BORRIELLO, F;SHARPE, AH
通讯作者:
SHARPE, AH
影响因子:
4.4
作者:
J. Verwilghen;R. Lovis;M. Boer;P. Linsley;G. Haines;A. Koch;R. Pope
通讯作者:
J. Verwilghen;R. Lovis;M. Boer;P. Linsley;G. Haines;A. Koch;R. Pope
DOI:
10.1073/pnas.94.15.8099
发表时间:
1997-07-22
影响因子:
11.1
作者:
Kwon, ED;Hurwitz, AA;Allison, JP
通讯作者:
Allison, JP
DOI:
--
发表时间:
1992
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Freeman,GJ;Lombard,DB;Gimmi,CD;Brod,SA;Lee,K;Laning,JC;Hafler,DA;Dorf,ME;Gray,GS;Reiser,H
通讯作者:
Reiser,H
DOI:
--
发表时间:
1993
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Ho,HN;Hultin,LE;Mitsuyasu,RT;Matud,JL;Hausner,MA;Bockstoce,D;Chou,CC;O'Rourke,S;Taylor,JM;Giorgi,JV
通讯作者:
Giorgi,JV