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1Chemical approaches towards installation of rare functional groups in bacterial surface glycans显示文摘Bacterial surface glycans perform a diverse and important set of biological roles,and have been widely used in the treatment of bacterial infectious diseases.The majority of bacterial surface glycans are decorated with diverse rare functional groups,including amido,acetamidino,carboxamido and pyruvate groups.These functional groups are thought to be important constituents for the biological activities of glycans.Chemical synthesis of glycans bearing these functional groups or their variants is essential for the investigation of structure-activity relationships by a medicinal chemistry approach.To date,a broad choice of synthetic methods is available for targeting the different rare functional groups in bacterial surface glycans.This article reviews the structures of naturally occurring rare functional groups in bacterial surface glycans,and the chemical methods used for installation of these groups.QIN Chun-Jun DING Mei-Ru TIAN Guang-Zong ZOU Xiao-Peng FU Jun-Jie HU Jing YIN Jian 2022Chinese Journal of Natural Medicines2022,20,6:0
2In vitro inhibition of HIV-1 replication in autologous CD4*T cells indicates viral containment by multifactorial mechanisms显示文摘HIV-1-specific cytotoxic T lymphocytes(CTLs) and neutralizing antibodies(NAbs) are present during chronic infection, but the relative contributions of these effector mechanisms to viral containment remain unclear. Here, using an in vitro model involving autologous CD4+ T cells,primary HIV-1 isolates, HIV-1-specific CTLs, and neutralizing monoclonal antibodies, we show that b12, a potent and broadly neutralizing monoclonal antibody to HIV-1, was able to block viral infection when preincubated with virus prior to infection, but was much less effective than CTLs at limiting virus replication when added to infected cell cultures. However, the same neutralizing antibody was able to contain viruses by antibody-dependent cell-mediated virus inhibition in vitro,which was mediated by natural killer cells(NKs) and dependent on an Fc-Fc receptor interaction.Meanwhile, bulk CTLs from HIV-1 controllers were more effective in suppression of virus replication than those from progressors. These findings indicate that control of HIV-1 replication in activated CD4^+ T cells is ineffectively mediated by neutralizing antibodies alone, but that both CTLs and antibody-dependent NK-mediated immune mechanisms contribute to viral containment. Our study systemically compared three major players in controlling HIV-1 infection, CTLs, NAbs, and NKs, in an autologous system and highlighted the multifactorial mechanisms for viral containment and vaccine success.Ting Tu Jianbo Zhan Danlei Mou Wei Li Bin Su Tong Zhang Tao Li Ning Li Hao Wu Cong Jin Huabiao Chen 2017Virologica Sinica2017,32,6:0
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