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Meng B, Wang J, Wang Q, Serianni AS, Pan Q. Synthesis of high-mannose oligosaccharides containing mannose-6-phosphate residues using regioselective glycosylation. Carbohydr Res 2018; 467:23-32. [PMID: 30075362 PMCID: PMC6121786 DOI: 10.1016/j.carres.2018.07.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 07/09/2018] [Accepted: 07/09/2018] [Indexed: 11/23/2022]
Abstract
Molecular recognition of mannose-6-phosphate (M6P)-modified oligosaccharides by transmembrane M6P receptors is a key signaling event in lysosomal protein trafficking in vivo. Access to M6P-containing high-mannose N-glycans is essential to achieving a thorough understanding of the M6P ligand-receptor recognition process. Herein we report the application of a versatile and reliable chemical strategy to prepare asymmetric di-antennary M6P-tagged high-mannose oligosaccharides in >20% overall yield and in high purity (>98%). Regioselective chemical glycosylation coupled with effective phosphorylation and product purification protocols were applied to rapidly assemble these oligosaccharides. The development of this synthetic strategy simplifies the preparation of M6P-tagged high-mannose oligosaccharides, which will improve access to these compounds to study their structures and biological functions.
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Affiliation(s)
- Bo Meng
- Omicron Biochemicals, Inc., 115 South Hill Street, South Bend, IN, 46617-2701, USA
| | - Jun Wang
- Omicron Biochemicals, Inc., 115 South Hill Street, South Bend, IN, 46617-2701, USA
| | - Quanli Wang
- Omicron Biochemicals, Inc., 115 South Hill Street, South Bend, IN, 46617-2701, USA
| | - Anthony S Serianni
- Omicron Biochemicals, Inc., 115 South Hill Street, South Bend, IN, 46617-2701, USA; Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, 46556-5670, USA
| | - Qingfeng Pan
- Omicron Biochemicals, Inc., 115 South Hill Street, South Bend, IN, 46617-2701, USA.
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Marciani DJ. Elucidating the Mechanisms of Action of Saponin-Derived Adjuvants. Trends Pharmacol Sci 2018; 39:573-585. [PMID: 29655658 DOI: 10.1016/j.tips.2018.03.005] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 03/08/2018] [Accepted: 03/16/2018] [Indexed: 12/14/2022]
Abstract
Numerous triterpenoid saponins are adjuvants that modify the activities of T cells and antigen-presenting cells, like dendritic cells (DCs). Saponins can induce either proinflammatory Th1/Th2 or sole anti-inflammatory Th2 immunities. Structure-activity relationships (SARs) have shown that imine-forming carbonyl groups are needed for T cell activation leading to induction of Th1/Th2 immunities. While saponins having different triterpenoid aglycons and oligosaccharide chains can activate DCs to induce Th1/Th2 immunoresponses, fucopyranosyl residues from their oligosaccharides by binding to the DC-SIGN receptor can bias DCs toward a sole Th2 immunity. Here we discuss the mechanisms of action of these saponins in view of new information, which may serve as a basis to design improved adjuvants and related drugs.
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Affiliation(s)
- Dante J Marciani
- Qantu Therapeutics, Inc., 612 East Main Street, Lewisville, TX 75057, USA.
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Meng B, Wang J, Wang Q, Serianni AS, Pan Q. Rapid assembly of branched mannose oligosaccharides through consecutive regioselective glycosylation: A convergent and efficient strategy. Tetrahedron 2017; 73:3932-3938. [PMID: 29104323 PMCID: PMC5667659 DOI: 10.1016/j.tet.2017.05.073] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A convergent and efficient strategy for the synthesis of high-mannose oligosaccharides is described wherein regioselective glycosylations between trichloroacetimidate donors and partially protected acceptors are employed to reduce the number of protection-deprotection steps. Two representative branched mannose oligosaccharides, a mannose heptasaccharide (Man7) and a mannose nonasaccharide (Man9) were constructed via (4+3) and (5+4) glycosylations, respectively. These mannose-containing oligosaccharides were obtained in nine steps in ~25% overall yield and >98% purity on 60-70 mg scales to demonstrate the effectiveness of the strategy.
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Affiliation(s)
- Bo Meng
- Omicron Biochemicals, Inc., 115 South Hill Street, South Bend, Indiana 46617-2701, USA
| | - Jun Wang
- Omicron Biochemicals, Inc., 115 South Hill Street, South Bend, Indiana 46617-2701, USA
| | - Qianli Wang
- Omicron Biochemicals, Inc., 115 South Hill Street, South Bend, Indiana 46617-2701, USA
| | - Anthony S Serianni
- Omicron Biochemicals, Inc., 115 South Hill Street, South Bend, Indiana 46617-2701, USA
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, USA
| | - Qingfeng Pan
- Omicron Biochemicals, Inc., 115 South Hill Street, South Bend, Indiana 46617-2701, USA
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Wang L, Wang Z, Su S, Xing Y, Li Y, Li M, Liu J, Yang S. Synthesis and cytotoxicity of oleanolic acid trisaccharide saponins. Carbohydr Res 2017; 442:9-16. [PMID: 28273565 DOI: 10.1016/j.carres.2017.02.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 02/27/2017] [Accepted: 02/27/2017] [Indexed: 11/15/2022]
Abstract
An array of oleanolic acid-type saponins based on β-hederin has been synthesized in a linear or one-pot manner. The cell viability assays indicate that synthetic saponins show antiproliferation activities in three cancer cell lines with IC50 values of 2.4-15.1 μM and hederacolchiside A1 being the most potent. The results demonstrate that the type of terminal monosaccharides and linkage position have apparent effects on cytotoxicities and selectivities of these saponins against cancer cell lines tested. This study is helpful for future development of more potent anticancer leads.
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Affiliation(s)
- Liming Wang
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China; Key Lab of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Zengshang Wang
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China; Department of the VIP Internal Medicine, The First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, China
| | - Sheng Su
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China
| | - Ying Xing
- Department of the VIP Internal Medicine, The First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, China
| | - Yali Li
- Department of the VIP Internal Medicine, The First Affiliated Hospital of Xinjiang Medical University, Urumqi 830011, China.
| | - Ming Li
- Key Lab of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.
| | - Jiangyun Liu
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China.
| | - Shilin Yang
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China
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Greatrex BW, Daines AM, Hook S, Lenz DH, McBurney W, Rades T, Rendle PM. Synthesis, Formulation, and Adjuvanticity of Monodesmosidic Saponins with Olenanolic Acid, Hederagenin and Gypsogenin Aglycones, and some C-28 Ester Derivatives. ChemistryOpen 2015; 4:740-55. [PMID: 27308200 PMCID: PMC4906508 DOI: 10.1002/open.201500149] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Revised: 08/20/2015] [Indexed: 11/06/2022] Open
Abstract
In an attempt to discover a new synthetic vaccine adjuvant, the glycosylation of hederagenin, gypsogenin, and oleanolic acid acceptors with di- and trisaccharide donors to generate a range of mimics of natural product QS-21 was carried out. The saponins were formulated with phosphatidylcholine and cholesterol, and the structures analyzed by transmission electron microscopy. 3-O-(Manp(1→3)Glcp)hederagenin was found to produce numerous ring-like micelles when formulated, while C-28 choline ester derivatives preferred self-assembly and did not interact with the liposomes. When alone and in the presence of cholesterol and phospholipid, the choline ester derivatives produced nanocrystalline rods or helical micelles. The effects of modifying sugar stereochemistry and the aglycone on the immunostimulatory effects of the saponins was then evaluated using the activation markers MHC class II and CD86 in murine bone marrow dendritic cells. The most active saponin, 3-O-(Manp(1→3)Glcp)hederagenin, was stimulatory at high concentrations in cell culture, but this did not translate to strong responses in vivo.
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Affiliation(s)
- Ben W. Greatrex
- Ferrier Research InstituteVictoria University of WellingtonGracefield RdLower Hutt5010New Zealand
- School of Science & TechnologyUniversity of New EnglandArmidaleNSW2351Australia
| | - Alison M. Daines
- Ferrier Research InstituteVictoria University of WellingtonGracefield RdLower Hutt5010New Zealand
| | - Sarah Hook
- School of PharmacyUniversity of OtagoDunedin9016New Zealand
| | - Dirk H. Lenz
- Ferrier Research InstituteVictoria University of WellingtonGracefield RdLower Hutt5010New Zealand
| | | | - Thomas Rades
- School of PharmacyUniversity of OtagoDunedin9016New Zealand
| | - Phillip M. Rendle
- Ferrier Research InstituteVictoria University of WellingtonGracefield RdLower Hutt5010New Zealand
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Lorent JH, Quetin-Leclercq J, Mingeot-Leclercq MP. The amphiphilic nature of saponins and their effects on artificial and biological membranes and potential consequences for red blood and cancer cells. Org Biomol Chem 2015; 12:8803-22. [PMID: 25295776 DOI: 10.1039/c4ob01652a] [Citation(s) in RCA: 141] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Saponins, amphiphiles of natural origin with numerous biological activities, are widely used in the cosmetic and pharmaceutical industry. Some saponins exhibit relatively selective cytotoxic effects on cancer cells but the tendency of saponins to induce hemolysis limits their anticancer potential. This review focused on the effects of saponin activity on membranes and consequent implications for red blood and cancer cells. This activity seems to be strongly related to the amphiphilic character of saponins that gives them the ability to self-aggregate and interact with membrane components such as cholesterol and phospholipids. Membrane interactions of saponins with artificial membrane models, red blood and cancer cells are reviewed with respect to their molecular structures. The review considered the mechanisms of these membrane interactions and their consequences including the modulation of membrane dynamics, interaction with membrane rafts, and membrane lysis. We summarized current knowledge concerning the mechanisms involved in the interactions of saponins with membrane lipids and examined the structure activity relationship of saponins regarding hemolysis and cancer cell death. A critical analysis of these findings speculates on their potential to further develop new anticancer compounds.
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Affiliation(s)
- Joseph H Lorent
- Université catholique de Louvain, Louvain Drug Research Institute, Cellular and Molecular Pharmacology (FACM), Avenue Mounier 73, B1.73.05, B-1200 Brussels, Belgium.
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Marciani DJ. New Th2 adjuvants for preventive and active immunotherapy of neurodegenerative proteinopathies. Drug Discov Today 2014; 19:912-20. [PMID: 24607730 DOI: 10.1016/j.drudis.2014.02.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 02/13/2014] [Accepted: 02/27/2014] [Indexed: 01/01/2023]
Abstract
Active immunotherapy of neurodegenerative proteinopathies, such as Alzheimer's disease, requires a Th2 antibody immune response with exclusion of damaging inflammatory Th1 immunity. Because these diseases affect the elderly whom, owing to immunosenescence, are frequently immune compromised, a successful therapy would require immune agonists capable of eliciting Th2 immunity solely while ameliorating the immune decline linked to aging; an objective hampered by the scarcity of Th2 immune agonists. The fact that some helminth-derived glycans and modified triterpene glycosides elicit Th2 immunity only, even when administered with antigens carrying T cell epitopes, presents new ways to improve the active immune therapy of proteinopathies. Of additional benefit is that these triterpene glycosides could amend some of the detrimental effects of the immunosenescence.
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Affiliation(s)
- Dante J Marciani
- Qantu Therapeutics, LLC, 612 E Main Street, Lewisville, TX 75057, USA.
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Hu J, Wu J, Ju Y. Methyl 1,2-Shift Rearrangement on C-ring and Decarboxylation at C28 of Oleanolic Acid Derivatives. CHINESE J CHEM 2013. [DOI: 10.1002/cjoc.201300758] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Joshi MD, Unger WJ, Storm G, van Kooyk Y, Mastrobattista E. Targeting tumor antigens to dendritic cells using particulate carriers. J Control Release 2012; 161:25-37. [DOI: 10.1016/j.jconrel.2012.05.010] [Citation(s) in RCA: 142] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2012] [Revised: 05/01/2012] [Accepted: 05/03/2012] [Indexed: 11/27/2022]
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An overview on the field of micro- and nanotechnologies for synthetic Peptide-based vaccines. JOURNAL OF DRUG DELIVERY 2011; 2011:181646. [PMID: 21773041 PMCID: PMC3134826 DOI: 10.1155/2011/181646] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Accepted: 04/05/2011] [Indexed: 11/17/2022]
Abstract
The development of synthetic peptide-based vaccines has many advantages in comparison with vaccines based on live attenuated organisms, inactivated or killed organism, or toxins. Peptide-based vaccines cannot revert to a virulent form, allow a better conservation, and are produced more easily and safely. However, they generate a weaker immune response than other vaccines, and the inclusion of adjuvants and/or the use of vaccine delivery systems is almost always needed. Among vaccine delivery systems, micro- and nanoparticulated ones are attractive, because their particulate nature can increase cross-presentation of the peptide. In addition, they can be passively or actively targeted to antigen presenting cells. Furthermore, particulate adjuvants are able to directly activate innate immune system in vivo. Here, we summarize micro- and nanoparticulated vaccine delivery systems used in the field of synthetic peptide-based vaccines as well as strategies to increase their immunogenicity.
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