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Bailly C, Bedart C, Vergoten G. A molecular docking exploration of the large extracellular loop of tetraspanin CD81 with small molecules. In Silico Pharmacol 2024; 12:24. [PMID: 38584777 PMCID: PMC10997574 DOI: 10.1007/s40203-024-00203-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Accepted: 03/13/2024] [Indexed: 04/09/2024] Open
Abstract
Tetraspanin CD81 is a transmembrane protein used as a co-receptor by different viruses and implicated in some cancer and inflammatory diseases. The design of therapeutic small molecules targeting CD81 lags behind monoclonal antibodies and peptides but different synthetic and natural products binding to CD81 have been identified. We have investigated the interaction between synthetic compounds and CD81, considering both the cholesterol-bound full-length receptor and a truncated protein corresponding to the large extracellular loop (LEL) of the tetraspanin. They represent the closed and open conformations of the protein, respectively. Stable complexes were characterized with bi-aryl compounds (notably the quinolinone-benzothiazole 6) and atypical molecules bearing a 1-amino-boraadamantane scaffold well adapted to interact with CD81 (5a-d). In each case, the mode of binding to CD81 was analyzed, the binding sites identified and the molecular contacts determined. The narrow intra-LEL binding site of CD81 can accommodate the elongated bi-aryl 6 but not a series of isosteric compounds with a bis(bicyclic) scaffold. The bora-adamantane derivatives appeared to bind well to CD81, but essentially to the external surface of the protein loop. The binding selectivity of the compounds was assessed comparing binding to the LEL of tetraspanins CD81, CD9 and Tspan15. A net preference for CD81 over CD9 was evidenced, but the LEL of Tspan15 also provided a suitable binding site for the compounds, notably for the bora-adamantane derivatives. This work provides an aid to the identification and design of tetraspanin-binding small molecules, underlining the distinct behavior of the open and closed conformation of the protein for drug binding. Supplementary Information The online version contains supplementary material available at 10.1007/s40203-024-00203-6.
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Affiliation(s)
- Christian Bailly
- OncoWitan, Scientific Consulting Office, 59290 Lille, Wasquehal, France
- University of Lille, CNRS, Inserm, CHU Lille, UMR9020-U1277, CANTHER, Cancer Heterogeneity Plasticity and Resistance to Therapies, 59000 Lille, France
| | - Corentin Bedart
- University of Lille, Inserm, U1286, INFINITE, Lille Inflammation Research International Center, Institut de Chimie Pharmaceutique Albert Lespagnol (ICPAL)Faculté de Pharmacie, 3 rue du Professeur Laguesse, 59,000 Lille, France
| | - Gérard Vergoten
- University of Lille, Inserm, U1286, INFINITE, Lille Inflammation Research International Center, Institut de Chimie Pharmaceutique Albert Lespagnol (ICPAL)Faculté de Pharmacie, 3 rue du Professeur Laguesse, 59,000 Lille, France
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Bailly C, Thuru X. Targeting of Tetraspanin CD81 with Monoclonal Antibodies and Small Molecules to Combat Cancers and Viral Diseases. Cancers (Basel) 2023; 15:cancers15072186. [PMID: 37046846 PMCID: PMC10093296 DOI: 10.3390/cancers15072186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/04/2023] [Accepted: 04/04/2023] [Indexed: 04/14/2023] Open
Abstract
Tetraspanin CD81 plays major roles in cell-cell interactions and the regulation of cellular trafficking. This cholesterol-embarking transmembrane protein is a co-receptor for several viruses, including HCV, HIV-1 and Chikungunya virus, which exploits the large extracellular loop EC2 for cell entry. CD81 is also an anticancer target implicated in cancer cell proliferation and mobility, and in tumor metastasis. CD81 signaling contributes to the development of solid tumors (notably colorectal, liver and gastric cancers) and has been implicated in the aggressivity of B-cell lymphomas. A variety of protein partners can interact with CD81, either to regulate attachment and uptake of viruses (HCV E2, claudin-1, IFIM1) or to contribute to tumor growth and dissemination (CD19, CD44, EWI-2). CD81-protein interactions can be modulated with molecules targeting the extracellular domain of CD81, investigated as antiviral and/or anticancer agents. Several monoclonal antibodies anti-CD81 have been developed, notably mAb 5A6 active against invasion and metastasis of triple-negative breast cancer cells. CD81-EC2 can also be targeted with natural products (trachelogenin and harzianoic acids A-B) and synthetic compounds (such as benzothiazole-quinoline derivatives). They are weak CD81 binders but offer templates for the design of new compounds targeting the open EC2 loop. There is no anti-CD81 compound in clinical development at present, but this structurally well-characterized tetraspanin warrants more substantial considerations as a drug target.
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Affiliation(s)
- Christian Bailly
- OncoWitan, Scientific Consulting Office, F-59290 Lille, France
- Institut de Chimie Pharmaceutique Albert Lespagnol (ICPAL), Faculty of Pharmacy, University of Lille, F-59006 Lille, France
- CNRS, Inserm, CHU Lille, UMR9020-U1277-Canther-Cancer Heterogeneity Plasticity and Resistance to Therapies, OncoLille Institut, University of Lille, F-59000 Lille, France
| | - Xavier Thuru
- CNRS, Inserm, CHU Lille, UMR9020-U1277-Canther-Cancer Heterogeneity Plasticity and Resistance to Therapies, OncoLille Institut, University of Lille, F-59000 Lille, France
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Bonsir M, Kennedy AR, Geerts Y. Synthesis and Structural Properties of Adamantane-Substituted Amines and Amides Containing an Additional Adamantane, Azaadamantane or Diamantane Moiety. Chemistry 2022; 11:e202200031. [PMID: 35243816 PMCID: PMC9535505 DOI: 10.1002/open.202200031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 02/11/2022] [Indexed: 11/12/2022]
Abstract
Introduction of adamantane moieties on diamondoids such as adamantane, 2‐azaadamantane or diamantane by amide formation and reduction to the corresponding amine was performed in a straightforward and easy way by amidation under Schotten–Baumann conditions and reduction with BH3 ⋅ THF. The obtained amides and amines were studied in terms of structural properties towards the perspective of transformation into nanodiamonds. Crystal structure and dynamic NMR experiments of the most crowded amide obtained gave structural insights into the effect of bulkiness and steric strain on out‐of‐planarity of amide bonds (16.0°) and the kinetics and thermodynamics of amide bond rotation (ΔG≠298K=11.5–13.3 kcal ⋅ mol−1).
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Affiliation(s)
- Maxime Bonsir
- Laboratoire de Chimie des Polymères, Faculté des Sciences, Université Libre de Bruxelles (ULB), Boulevard du Triomphe, CP 206/01, 1050, Bruxelles, Belgium
| | - Alan R Kennedy
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, G1 1XL, Glasgow, Scotland, UK
| | - Yves Geerts
- Laboratoire de Chimie des Polymères, Faculté des Sciences, Université Libre de Bruxelles (ULB), Boulevard du Triomphe, CP 206/01, 1050, Bruxelles, Belgium.,International Solvay Institutes for Physics and Chemistry, Université Libre de Bruxelles (ULB), Boulevard du Triomphe, CP 231, 1050, Bruxelles, Belgium
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Berionni G, Chardon A, Osi A, Mahaut D, Saida AB. Non-planar Boron Lewis Acids Taking the Next Step: Development of Tunable Lewis Acids, Lewis Superacids and Bifunctional Catalysts. Synlett 2020. [DOI: 10.1055/s-0040-1707078] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Although boron Lewis acids commonly adopt a trigonal planar geometry, a number of compounds in which the trivalent boron atom is located in a pyramidal environment have been described. This review will highlight the recent developments of the chemistry and applications of non-planar boron Lewis acids, including a series of non-planar triarylboranes derived from the triptycene core. A thorough analysis of the properties and of the influence of the pyramidalization of boron Lewis acids on their stereoelectronic properties and reactivities is presented based on recent theoretical and experimental studies.1 Non-planar Trialkylboranes2 Non-planar Alkyl and Aryl-Boronates3 Non-planar Triarylboranes and Alkenylboranes3.1 Previous Investigations on Bora Barrelenes and Triptycenes3.2 Recent Work on Boratriptycenes from Our Research Group4 Applications of Non-planar Boranes4.1 Non-planar Alkyl Boranes and Boronates4.2 Non-planar Triarylboranes (Boratriptycenes)5 Other Non-planar Group 13 Lewis Acids6 Further Work and Perspectives
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Affiliation(s)
- Guillaume Berionni
- Department of Chemistry, Namur Institute of Structured Matter, University of Namur
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Li C, Chen H, Chen X, Li Y, Hua P, Wei J, Song C, Gu Q, Zhou H, Zhang J, Xu J. Discovery of tissue selective liver X receptor agonists for the treatment of atherosclerosis without causing hepatic lipogenesis. Eur J Med Chem 2019; 182:111647. [PMID: 31499362 DOI: 10.1016/j.ejmech.2019.111647] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Revised: 08/02/2019] [Accepted: 08/26/2019] [Indexed: 01/21/2023]
Abstract
Liver X Receptor (LXR) is a potential drug target for atherosclerosis. One of the major challenges in taking LXR modulators to the clinic is steatosis. It was reported that sterol LXR agonists selectively activate LXR in the intestine and macrophage cells rather than in the liver. We hypothesize that sterol LXR agonists may selectively inhibit atherosclerosis without causing hepatic lipogenesis. Thus, based on LXR structure, 12 sterol compounds were designed and tested in a dual-luciferase reporter gene experiment. It was confirmed that compounds 4 and 6 were LXR agonists. Further experiments demonstrated that compounds 4 and 6 inhibit the formation of macrophage foam cells without inducing triglyceride accumulation in either hepatocytes or adipocytes. In vivo studies demonstrated that compound 4 promotes reverse cholesterol transport without inducing hepatic lipogenesis. Thus, we report that these compounds with sterol scaffolds can be promising leads for the treatment of atherosclerosis without inducing steatosis.
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Affiliation(s)
- Chanjuan Li
- School of Pharmaceutical Sciences, Sun Yat-Sen University, 132 East Circle Road at University City, Guangzhou, 510006, China
| | - Hao Chen
- School of Pharmaceutical Sciences, Sun Yat-Sen University, 132 East Circle Road at University City, Guangzhou, 510006, China
| | - Xinying Chen
- School of Pharmaceutical Sciences, Sun Yat-Sen University, 132 East Circle Road at University City, Guangzhou, 510006, China
| | - Yanwen Li
- School of Pharmaceutical Sciences, Sun Yat-Sen University, 132 East Circle Road at University City, Guangzhou, 510006, China
| | - Pei Hua
- School of Pharmaceutical Sciences, Sun Yat-Sen University, 132 East Circle Road at University City, Guangzhou, 510006, China
| | - Junkang Wei
- School of Pharmaceutical Sciences, Sun Yat-Sen University, 132 East Circle Road at University City, Guangzhou, 510006, China
| | - Ching Song
- School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Qiong Gu
- School of Pharmaceutical Sciences, Sun Yat-Sen University, 132 East Circle Road at University City, Guangzhou, 510006, China
| | - Huihao Zhou
- School of Pharmaceutical Sciences, Sun Yat-Sen University, 132 East Circle Road at University City, Guangzhou, 510006, China
| | - Jingxia Zhang
- School of Pharmaceutical Sciences, Sun Yat-Sen University, 132 East Circle Road at University City, Guangzhou, 510006, China.
| | - Jun Xu
- School of Pharmaceutical Sciences, Sun Yat-Sen University, 132 East Circle Road at University City, Guangzhou, 510006, China.
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Synthesis of 3,5-dimethyl-1-boraadamantane and its transformation into 3,5-dimethyl-1-azaadamantane. MENDELEEV COMMUNICATIONS 2018. [DOI: 10.1016/j.mencom.2018.07.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Due-Hansen ME, Pandey SK, Christiansen E, Andersen R, Hansen SVF, Ulven T. A protocol for amide bond formation with electron deficient amines and sterically hindered substrates. Org Biomol Chem 2016; 14:430-433. [DOI: 10.1039/c5ob02129d] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A protocol for amide coupling by in situ formation of acyl fluorides and reaction with amines at elevated temperature has been developed and found to be efficient for coupling of sterically hindered substrates and electron deficient amines where standard methods failed.
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Affiliation(s)
- Maria E. Due-Hansen
- Department of Physics
- Chemistry and Pharmacy
- University of Southern Denmark
- DK-5230 Odense M
- Denmark
| | - Sunil K. Pandey
- Department of Physics
- Chemistry and Pharmacy
- University of Southern Denmark
- DK-5230 Odense M
- Denmark
| | - Elisabeth Christiansen
- Department of Physics
- Chemistry and Pharmacy
- University of Southern Denmark
- DK-5230 Odense M
- Denmark
| | - Rikke Andersen
- Department of Physics
- Chemistry and Pharmacy
- University of Southern Denmark
- DK-5230 Odense M
- Denmark
| | - Steffen V. F. Hansen
- Department of Physics
- Chemistry and Pharmacy
- University of Southern Denmark
- DK-5230 Odense M
- Denmark
| | - Trond Ulven
- Department of Physics
- Chemistry and Pharmacy
- University of Southern Denmark
- DK-5230 Odense M
- Denmark
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Voloshin YZ, Novikov VV, Nelyubina YV. Recent advances in biological applications of cage metal complexes. RSC Adv 2015. [DOI: 10.1039/c5ra10949c] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This review highlights advances in biochemical and medical applications of cage metal complexes (clathrochelates) and related polyhedral compounds.
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Affiliation(s)
- Yan Z. Voloshin
- Nesmeyanov Institute of the Organoelement Compounds
- Russian Academy of Sciences
- Moscow
- Russia
| | - Valentin V. Novikov
- Nesmeyanov Institute of the Organoelement Compounds
- Russian Academy of Sciences
- Moscow
- Russia
| | - Yulia V. Nelyubina
- Nesmeyanov Institute of the Organoelement Compounds
- Russian Academy of Sciences
- Moscow
- Russia
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Basarić N, Sohora M, Cindro N, Mlinarić-Majerski K, De Clercq E, Balzarini J. Antiproliferative and antiviral activity of three libraries of adamantane derivatives. Arch Pharm (Weinheim) 2014; 347:334-40. [PMID: 24532384 DOI: 10.1002/ardp.201300345] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 11/15/2013] [Accepted: 11/15/2013] [Indexed: 11/12/2022]
Abstract
Three libraries of adamantane derivatives were synthesized and evaluated for antiviral and antiproliferative activities against a broad variety of DNA and RNA viruses. Whereas none of the compounds exhibit antiviral activity at subtoxic concentrations, antiproliferative activity was found against murine leukemia cells (L1210), human T-lymphocyte cells (CEM), and cervix carcinoma cells (HeLa) for 4, 8, and 10.
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Affiliation(s)
- Nikola Basarić
- Department of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Zagreb, Croatia
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Wanka L, Iqbal K, Schreiner PR. The lipophilic bullet hits the targets: medicinal chemistry of adamantane derivatives. Chem Rev 2013; 113:3516-604. [PMID: 23432396 PMCID: PMC3650105 DOI: 10.1021/cr100264t] [Citation(s) in RCA: 433] [Impact Index Per Article: 39.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Lukas Wanka
- Institute of Organic Chemistry, Justus-Liebig University Giessen, Heinrich-Buff-Ring 58, 35392 Giessen, Germany; Fax +49(641)9934309
- Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, 1050 Forest Hill Road, Staten Island, NY 10314-6399, USA
| | - Khalid Iqbal
- Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, 1050 Forest Hill Road, Staten Island, NY 10314-6399, USA
| | - Peter R. Schreiner
- Institute of Organic Chemistry, Justus-Liebig University Giessen, Heinrich-Buff-Ring 58, 35392 Giessen, Germany; Fax +49(641)9934309
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11
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Novikov VV, Varzatskii OA, Negrutska VV, Bubnov YN, Palchykovska LG, Dubey IY, Voloshin YZ. Size matters, so does shape: Inhibition of transcription of T7 RNA polymerase by iron(II) clathrochelates. J Inorg Biochem 2013; 124:42-5. [PMID: 23598064 DOI: 10.1016/j.jinorgbio.2013.03.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 03/01/2013] [Accepted: 03/04/2013] [Indexed: 11/15/2022]
Abstract
Coordination and organoelement compounds are rarely proposed as the drug candidates despite their vast potential in the area owing to their strictly controlled geometry and rather extensive surface. This is the first example of the inhibition of transcription in the system of T7 RNA polymerase by cage metal complexes. Their IC50 values reach as low as the nanomolar range, placing them among the most potent metal-based transcription inhibitors.
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Vishnevskiy YV, Abaev MA, Rykov AN, Gurskii ME, Belyakov PA, Erdyakov SY, Bubnov YN, Mitzel NW. Structure and Bonding Nature of the Strained Lewis Acid 3-Methyl-1-boraadamantane: A Case Study Employing a New Data-Analysis Procedure in Gas Electron Diffraction. Chemistry 2012; 18:10585-94. [DOI: 10.1002/chem.201200264] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Revised: 04/05/2012] [Indexed: 11/11/2022]
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13
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Welker MW, von Wagner M, Ochs D, Zimmer V, Hofmann WP, Piiper A, Hartmann RW, Herrmann E, Zeuzem S, Kronenberger B. Influence of amantadine on CD81 expression on lymphocytes in chronic hepatitis C. Dig Liver Dis 2010; 42:735-40. [PMID: 20457015 DOI: 10.1016/j.dld.2010.03.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2009] [Revised: 02/19/2010] [Accepted: 03/17/2010] [Indexed: 12/11/2022]
Abstract
INTRODUCTION Interferon alpha (IFN) down regulates CD81 expression on peripheral blood mononuclear cells (PBMC) in patients with chronic hepatitis C virus (HCV) infection. Aim of our study was to investigate whether amantadine alters IFN associated down regulation of CD81 expression on PBMC in patients with chronic hepatitis C. METHODS Nineteen patients with chronic HCV infection received peginterferon alpha-2a/ribavirin (SOC) for 48 weeks. Patients were randomised to 12 weeks amantadine therapy (n=12) or no additional treatment (n=7). FACS analysis of CD81 expression on CD4(+), CD8(+), CD19(+), and CD56(+) cells was performed at baseline, week (TW) 4, TW12, and TW24 of antiviral therapy. RESULTS A significant decline of CD81 expression was observed on CD4(+), CD8(+), and CD56(+) cells (p=0.011, p<0.001, p=0.015, respectively) but not on CD19(+) cells (p>0.2). CD81 expression on CD4(+), CD8(+), CD19(+), and CD56(+) cells was not different between patients treated with SOC plus amantadine and patients treated with SOC alone. CONCLUSION The current study confirms that CD81 expression is down regulated by SOC on CD4(+), CD8(+) and CD56(+) cells. Amantadine treatment was not associated with CD81 expression. Interaction between amantadine and CD81 is unlikely to be involved in potential antiviral activity of amantadine in chronic HCV infection.
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Affiliation(s)
- Martin-Walter Welker
- Medizinische Klinik 1, Klinikum der Johann Wolfgang Goethe-Universität, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
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14
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Patil R, Patil S, Wang X, Ma F, Orr WE, Li W, Yates CR, Geisert EE, Miller DD. Synthesis and evaluation of new 1,2,3,4-tetrahydroisoquinoline analogs as antiglioma agents. Med Chem Res 2010. [DOI: 10.1007/s00044-010-9356-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Erdyakov SY, Ignatenko AV, Potapova TV, Lyssenko KA, Gurskii ME, Bubnov YN. Design of bicyclic and cage boron compounds based on allylboration of acetylenes with allyldichloroboranes. Org Lett 2009; 11:2872-5. [PMID: 19505127 DOI: 10.1021/ol900793r] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Allylboration of acetylenes with allyldichloroboranes has been proposed as a first step of allylboron-acetylene condensation and a way to design condensation products from stage to stage. The chemistry has been applied to the synthesis of isomeric 3-borabicyclo[3.3.1]non-6-enes transformed into 3-methyl-1-boraadamantane and [5-D]-3-methyl-1-boraadamantane derivatives.
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Affiliation(s)
- Sergey Yu Erdyakov
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia 119991
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Beleid R, Douglas D, Kneteman N, Kaur K. Helical peptides derived from lactoferrin bind hepatitis C virus envelope protein E2. Chem Biol Drug Des 2009; 72:436-43. [PMID: 19012577 DOI: 10.1111/j.1747-0285.2008.00715.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Hepatitis C virus is a major cause of chronic hepatitis, liver cirrhosis, and hepatocellular carcinoma infecting more than 170 million people. Hepatitis C virus envelope 2 glycoprotein (E2) binds several cell-surface molecules that act as receptor candidates mediating hepatitis C virus entry into hepatocytes. Peptides derived from human lactoferrin have been shown to bind hepatitis C virus-E2 protein thereby preventing hepatitis C virus entry in cultured hepatocytes. In this study, starting from a 33-residue human lactoferrin-derived peptide, a number of biotin-linked alpha-peptides were synthesized and investigated for their E2 protein binding activity. E2 protein from hepatitis C virus genotype 1b was expressed in 293 human embryonic kidney cells and purified using affinity chromatography. A biotin-streptavidin based binding assay was developed to determine the binding affinity of the synthetic peptides for E2 protein. Two of the peptides bound E2 specifically with submicromolar to low micromolar affinity [equilibrium dissociation constant (K(d)) of 0.569 and 28.8 microM]. Further, these two peptides had the highest helical content in solution as observed by circular dichroism spectroscopy, suggesting that binding affinity increases with increase in helicity. These results have provided new lead peptides for future investigations of hepatitis C virus entry inhibitors that may provide an interesting approach to prevent hepatitis C virus infectivity.
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Affiliation(s)
- Reem Beleid
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, AB, Canada T6G2N8
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Meuleman P, Hesselgesser J, Paulson M, Vanwolleghem T, Desombere I, Reiser H, Leroux-Roels G. Anti-CD81 antibodies can prevent a hepatitis C virus infection in vivo. Hepatology 2008; 48:1761-8. [PMID: 19030166 DOI: 10.1002/hep.22547] [Citation(s) in RCA: 176] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
UNLABELLED The viral life cycle of the hepatitis C virus (HCV) has been studied mainly using different in vitro cell culture models. Studies using pseudoviral particles (HCVpp) and more recently cell culture-derived virus (HCVcc) suggest that at least three host cell molecules are important for HCV entry in vitro: the tetraspanin CD81, the scavenger receptor class B member I, and the tight junction protein Claudin-1. Whether these receptors are equally important for an in vivo infection remains to be demonstrated. We show that CD81 is indispensable for an authentic in vivo HCV infection. Prophylactic treatment with anti-CD81 antibodies completely protected human liver-uPA-SCID mice from a subsequent challenge with HCV consensus strains of different genotypes. Administration of anti-CD81 antibodies after viral challenge had no effect. CONCLUSION Our experiments provide evidence for the critical role of CD81 in a genuine HCV infection in vivo and open new perspectives for the prevention of allograft reinfection after orthotopic liver transplantation in chronically infected HCV patients.
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Affiliation(s)
- Philip Meuleman
- Center for Vaccinology, Ghent University and Hospital, Ghent, Belgium.
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Effects, in an in-vivo model system, of 1,2,3,4-tetrahydroisoquinoline on glioma. Anticancer Drugs 2008; 19:859-70. [DOI: 10.1097/cad.0b013e32830d5887] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Abiman P, Wildgoose GG, Crossley A, Compton RG. Removal of palladium ions from aqueous systems by chemically modified cysteine carbon powder. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b805804k] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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