tailieunhanh - Báo cáo y học: " In situ detection of Gag-specific CD8+ cells in the GI tract of SIV infected Rhesus macaques"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Retrovirology cung cấp cho các bạn kiến thức về ngành y đề tài: " In situ detection of Gag-specific CD8+ cells in the GI tract of SIV infected Rhesus macaques. | Tjernlund et al. Retrovirology 2010 7 12 http content 7 1 12 RETR0VIR0L0GY RESEARCH Open Access In situ detection of Gag-specific CD8 cells in the GI tract of SIV infected Rhesus macaques 1112 3 3 4 Annelie Tjernlund Jia Zhu Kerry Laing Kurt Diem David McDonald Julio Vazquez Jianhong Cao Claes Ohlen5 M Juliana McElrath1 2 Louis J Picker6 7 8 9 Lawrence Corey1 2 Abstract Background SIV and HIV predominantly replicate in lymphoid tissue but the study of virus specific CD8 T cells in intact lymphoid tissue is difficult as traditional in situ tetramer staining requires fresh tissue. Results In this report we demonstrate a novel technique using Qdot 655-conjugated peptide-MHC multimers to directly visualize SIV specific cells in cryopreserved tissue biopsies from chronically SIVmac239 infected Rhesus macaques. Qdot 655 multimers showed similar sensitivity and specificity to APC-conjugated tetramers by flow cytometry analysis but yielded ten-fold higher signal intensity when imaged by fluorescence microscopy. Using this technique we detected CD8 T cells which recognize an immunodominant epitope Gag CM9 in the spleen lymph nodes ileum and colon. In all these tissues the Gag CM9 positive cells were mainly located in the extra follicular T cell zone. In the ileum and colon we found Gag CM9 positive cells concentrated in Peyer s patches and solitary lymphoid follicles a pattern of localization not previously described. Conclusions The use of Qdot multimers provide an anatomic and quantitative evaluation of SIV specific CD8 T cell responses in SIV pathogenesis and may prove useful to studies of SIV specific CD8 T cell responses elicited by vaccines and other immunotherapies in the non-human primate model. Background While many reports have described the pivotal role CD8 T cells play in controlling SIV and HIV-1 replication the anatomic distribution of HIV or SIV specific CD8 T cells and their relationship to HIV SIV infected cells has not been well .

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