HIV VARIATION AND CROSS CLADE CTL RECOGNITION
HIV VARIATION AND CROSS CLADE CTL RECOGNITION
批准号:
6448474
负责人:
DOUGLAS F NIXON
金额:
$22.41万
依托单位国家:
美国
项目类别:
财政年份:
1999
资助国家:
美国
项目状态:
已结题
起止时间:
1999-09-30 至 2004-08-31
中文摘要
描述:(改编自申请人的摘要)该项目响应
计划公告 # PA-98-011“HIV 变异对免疫学的影响
认可。”该提案的目的是调查跨进化枝艾滋病毒
特定的 CTL 响应。刺激广泛的跨进化枝反应性 HIV
特异性 CTL 反应被认为对于成功的 HIV 疫苗至关重要。的
高度的序列变异是HIV感染的一个显着特征,并且
疫苗开发的一个主要障碍。然而,相关信息却非常少
了解国际不同人群中 HIV 特异性 CTL 反应
HLA 类型,感染 HIV 分支变异。通过我们的合作者,我们已经
获取来自非洲、中国和南方的 HIV 感染者的 PBMC 样本
美国和泰国感染了 HIV-1 和 HIV-2。在第一个具体目标中,
我们将确定交叉反应性CTL表位是否存在于不同的
感染不同分支 HIV-1 的人群。我们将测量交叉
使用敏感的 ELISPOT 测定反应性 CTL 反应,使用一组
表达 HIV-1 基因产物的进化枝特异性重组痘苗病毒
env、gag、p01 和 nef,以及进化枝特异性肽。批量培养 CTL 反应
将通过多克隆和抗原特异性再刺激生成并进行测试
具有进化枝特异性的自体或匹配的 B 淋巴母细胞靶标
抗原。我们将所有患者的 CTL 频率与病毒 RNA 血浆载量相关联
进化枝并评估最佳定义的最小氨基酸是否发生变化
表位可以使 HIV CTL 表位更具交叉反应性。在第二个具体
目的,我们将确定感染 HlV~2 是否会刺激交叉的 CTL
与 HIV-1 发生反应或反之亦然,以及某些人是否受到 HIV-1 的保护
HIV-1 的一个分支对抗另一个分支的重复感染。
英文摘要
DESCRIPTION: (Adapted from Applicant's Abstract) This project is responsive to
the Program Announcement # PA-98-011 "Impact of HIV Variation on Immunological
Recognition." The aim of this proposal is to investigate cross clade HIV
specific CTL responses. Stimulation of a broad cross clade reactive HIV
specific CTL response is considered crucial for a successful HIV vaccine. The
high degree of sequence variation is a prominent feature of HIV infection, and
a major impediment to vaccine development. However, very little information is
known about HIV specific CTL responses in international populations of diverse
HLA types, infected with HIV clade variants. Through our collaborators, we have
access to PBMC samples from HIV infected individuals in Africa, China, South
America and Thailand infected with HIV-1 and HIV-2. In the first specific aim,
we will determine whether cross-reactive CTL epitopes exist in diverse
populations infected with different clades of HIV-1. We will measure cross
reactive CTL responses with a sensitive ELISPOT assay, using both a panel of
clade specific recombinant vaccinia viruses expressing HIV-1 gene products from
env, gag, p01 and nef, and clade specific peptides. Bulk culture CTL responses
will be generated with polyclonal and antigen specific restimulation and tested
on autologous or matched B lymphoblastoid cell targets with clade specific
antigens. We will correlate CTL frequency with plasma load of viral RNA for all
clades and assess whether amino acid changes in optimally defined minimal
epitopes can make HIV CTL epitopes more cross reactive. In the second specific
aim, we will ascertain whether infection with HlV~2 stimulates CTL which cross
react with HIV-1 or vice versa, and whether some individuals are protected by
one clade of HIV-1 against super-infection with another.
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会议论文
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海外基金