Translocation of viral integrase into nucleus is a critical precondition of integration during the life cycle of HIV, a causative agent of Acquired Immunodeficiency Syndromes (AIDS). It has been considered as an important target for the drug development to treat AIDS. In order to understand the detailed mechanisms of integrase-host cell protein complex interactions, we cloned HIV-1 integrase-EGFP into pTRE2hyg as visible tag to monitor the translocation process. When transiently transfected this vector into Tet-off ready HeLa cells, the EGFP: integrase is mainly localized in the nucleus. It has been hypothesized that any drugs that can inhibit the translocation process are novel class of drugs for AIDS treatment. More than 30000 synthetic compounds and 80000 natural products were screened by virtual screening. A total of 34 compounds were obtained and screened for their ability to block the nuclear entry of HIV-1 integrase by monitoring the EGFP fluorescence in the cells by high-throughput live cell imaging. Eight synthetic compounds (DW-IN4, DW-IN5, DW-IN6, DW-IN9, DW-IN15, DW-IN16, DW-IN17, DW-IN21) and one natural product (DW-IN719) were found to block integrase translocation significantly. According to our screening result, six compounds (INNB-1, INNB-2, INNB-3, INNB-4, INNB-5, INNB-6) were designed and synthesized. INNB-1 and INNB-2 had significant inhibition on integrase nuclear translocation. DW-IN6, DWIN719, INNB-1, INNB-2, INNB-3 and INNB-4, showed significant inhibition on P24 production in live virus assay. DW-IN6, INNB-1, INNB-2, INNB-3 and INNB-4 showed significant syncitia formation inhibition in live virus assay. Six compounds (KM7, KM8, KM14, KM30, KM37, KM79) from Kunming were screened as integrase nuclear translocation inhibitors. Using similar cell imaging techniques, we have cloned the GFP-tagged chemokine receptor CXCR4 using the lentivirus transfection system. CXCR4 receptor is a critical co-receptor in CD4 positive lymphocytes mediating the fusion of HIV into the CD4 positive cells. CXCR4-GFP was over-expressed in 293T cells and the results showed that GFP:CXCR4 receptor is expressed at the plasma membrane of the cells. These cells have been used to monitor the blockage of CXCR4 receptor internalization for drug development. Four compounds (KX128, KX166, KX171, KX180) from Kunming showed CXCR4 internalization blockage in imaging assay. The interaction of these compounds with CXCR4 was predicted by molecular docking. KX128 showed significant HIV inhibition in live virus assays. / Gu, Wangang. / Advisers: Pang Chui Shaw; David Chi Cheong Wan. / Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references (leaves 165-179). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.
| Identifer | oai:union.ndltd.org:cuhk.edu.hk/oai:cuhk-dr:cuhk_344977 |
| Date | January 2011 |
| Contributors | Gu, Wangang., Chinese University of Hong Kong Graduate School. Division of Biochemistry. |
| Source Sets | The Chinese University of Hong Kong |
| Language | English, Chinese |
| Detected Language | English |
| Type | Text, theses |
| Format | electronic resource, microform, microfiche, 1 online resource (xv, 179 leaves : ill. (some col.)) |
| Rights | Use of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/) |
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