1
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Craciun BF, Sandu IA, Peptanariu D, Pinteala M. Novel Nanotherapeutic Systems Based on PEGylated Squalene Micelles for Enhanced In Vitro Activity of Methotrexate and Cytarabine. Polymers (Basel) 2023; 15:4225. [PMID: 37959905 PMCID: PMC10650902 DOI: 10.3390/polym15214225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 10/23/2023] [Accepted: 10/23/2023] [Indexed: 11/15/2023] Open
Abstract
Nanomedicine has garnered significant attention due to the advantages it offers in the treatment of cancer-related disorders, some of the deadliest diseases affecting human lives. Conventional medication formulations often encounter issues of instability or insolubility in biological environments, resulting in low bioavailability. Nanocarriers play a crucial role in transporting and safeguarding drugs at specific sites of action, enabling gradual release under particular conditions. This study focuses on methotrexate (MTx) and cytarabine (Cyt), essential antitumoral drugs, loaded into PEGylated squalene micellar structures to enhance therapeutic effectiveness and minimize drawbacks. The micelles were prepared using ultrasound-assisted methods in both water and phosphate buffer saline solutions. Evaluation of drug-loaded micelles encompassed parameters such as particle size, colloidal stability, surface charge, morphology, encapsulation efficiency, drug loading capacity, and in vitro release profiles under simulated physiological and tumoral conditions. In vitro cell inhibition studies conducted on MCF-7 and HeLa cell lines demonstrated higher antitumoral activity for the drug-encapsulated micelles compared to free drugs. The encapsulation effectively addressed the burst effect, providing sustained release for at least 48 h while enhancing the drug's protection under physiological conditions.
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Affiliation(s)
- Bogdan-Florin Craciun
- Centre of Advanced Research in Bionanoconjugates and Biopolymers, “Petru Poni” Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania; (I.-A.S.); (D.P.)
| | | | | | - Mariana Pinteala
- Centre of Advanced Research in Bionanoconjugates and Biopolymers, “Petru Poni” Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania; (I.-A.S.); (D.P.)
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2
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Gendron A, Lan Linh Tran N, Laloy J, Brusini R, Rachet A, Gobeaux F, Nicolas V, Chaminade P, Abreu S, Desmaële D, Varna M. New Nanoparticle Formulation for Cyclosporin A: In Vitro Assessment. Pharmaceutics 2021; 13:pharmaceutics13010091. [PMID: 33445646 PMCID: PMC7828155 DOI: 10.3390/pharmaceutics13010091] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 01/07/2021] [Accepted: 01/08/2021] [Indexed: 01/02/2023] Open
Abstract
Cyclosporin A (CsA) is a molecule with well-known immunosuppressive properties. As it also acts on the opening of mitochondrial permeability transition pore (mPTP), CsA has been evaluated for ischemic heart diseases (IHD). However, its distribution throughout the body and its physicochemical characteristics strongly limit the use of CsA for intravenous administration. In this context, nanoparticles (NPs) have emerged as an opportunity to circumvent the above-mentioned limitations. We have developed in our laboratory an innovative nanoformulation based on the covalent bond between squalene (Sq) and cyclosporin A to avoid burst release phenomena and increase drug loading. After a thorough characterization of the bioconjugate, we proceeded with a nanoprecipitation in aqueous medium in order to obtain SqCsA NPs of well-defined size. The SqCsA NPs were further characterized using dynamic light scattering (DLS), cryogenic transmission electron microscopy (cryoTEM), and high-performance liquid chromatography (HPLC), and their cytotoxicity was evaluated. As the goal is to employ them for IHD, we evaluated the cardioprotective capacity on two cardiac cell lines. A strong cardioprotective effect was observed on cardiomyoblasts subjected to experimental hypoxia/reoxygenation. Further research is needed in order to understand the mechanisms of action of SqCsA NPs in cells. This new formulation of CsA could pave the way for possible medical application.
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Affiliation(s)
- Amandine Gendron
- Institut Galien Paris-Saclay, Université Paris-Saclay, CNRS UMR 8612, 92296 Châtenay-Malabry, France; (A.G.); (N.L.L.T.); (R.B.); (A.R.); (D.D.)
| | - Natalie Lan Linh Tran
- Institut Galien Paris-Saclay, Université Paris-Saclay, CNRS UMR 8612, 92296 Châtenay-Malabry, France; (A.G.); (N.L.L.T.); (R.B.); (A.R.); (D.D.)
- Namur Nanosafety Centre, Department of Pharmacy, Namur Research Institute for Life Sciences (NARILIS), University of Namur (UNamur), 5000 Namur, Belgium;
| | - Julie Laloy
- Namur Nanosafety Centre, Department of Pharmacy, Namur Research Institute for Life Sciences (NARILIS), University of Namur (UNamur), 5000 Namur, Belgium;
| | - Romain Brusini
- Institut Galien Paris-Saclay, Université Paris-Saclay, CNRS UMR 8612, 92296 Châtenay-Malabry, France; (A.G.); (N.L.L.T.); (R.B.); (A.R.); (D.D.)
| | - Aurélie Rachet
- Institut Galien Paris-Saclay, Université Paris-Saclay, CNRS UMR 8612, 92296 Châtenay-Malabry, France; (A.G.); (N.L.L.T.); (R.B.); (A.R.); (D.D.)
- Institute for Integrative Biology of the Cell (I2BC), Université Paris-Saclay, CEA, CNRS, 91198 Gif-sur-Yvette, France
| | - Frédéric Gobeaux
- CEA, CNRS, NIMBE, Université Paris-Saclay, CEA-Saclay, 91191 Gif sur Yvette, France;
| | - Valérie Nicolas
- Ingénierie et Plateformes au Service de l’Innovation (IPSIT), UMS IPSIT Université Paris-Saclay—US 31 INSERM—UMS 3679 CNRS, Plate-forme d’imagerie cellulaire MIPSIT, 92290 Châtenay-Malabry, France;
| | - Pierre Chaminade
- Lipides: Systèmes Analytiques et Biologiques, Université Paris-Saclay, 92296 Châtenay-Malabry, France; (P.C.); (S.A.)
| | - Sonia Abreu
- Lipides: Systèmes Analytiques et Biologiques, Université Paris-Saclay, 92296 Châtenay-Malabry, France; (P.C.); (S.A.)
| | - Didier Desmaële
- Institut Galien Paris-Saclay, Université Paris-Saclay, CNRS UMR 8612, 92296 Châtenay-Malabry, France; (A.G.); (N.L.L.T.); (R.B.); (A.R.); (D.D.)
| | - Mariana Varna
- Institut Galien Paris-Saclay, Université Paris-Saclay, CNRS UMR 8612, 92296 Châtenay-Malabry, France; (A.G.); (N.L.L.T.); (R.B.); (A.R.); (D.D.)
- Correspondence: ; Tel.: +33-0146835721
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3
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Phan VHG, Trang Duong HT, Tran PT, Thambi T, Ho DK, Murgia X. Self-Assembled Amphiphilic Starch Based Drug Delivery Platform: Synthesis, Preparation, and Interactions with Biological Barriers. Biomacromolecules 2020; 22:572-585. [PMID: 33346660 DOI: 10.1021/acs.biomac.0c01430] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Core-shell structured nanoparticles (NPs) render the simultaneous coloading capacity of both hydrophobic and hydrophilic drugs and may eventually enhance therapeutic efficacy. In this study, we employed a facile squalenoylation technology to synthesize a new amphiphilic starch derivative from partially oxidized starch, which self-assembled into core-shell starch NPs (StNPs) only at a squalenyl degree of substitution (DoS) of ∼1%. The StNPs characteristics could be tuned as the functions of the polymer molecular weight, DoS, and NPs concentration. The biopharmaceutical features of the StNPs, including colloidal stability, carrier properties, and biocompatibility, were carefully investigated. The interaction study between StNPs and mucin glycoproteins, the main organic component of mucus, revealed a moderate mucin interacting profile. Furthermore, the StNPs also showed good penetration through Pseudomonas aeruginosa biofilms. These results nominate StNPs as a versatile drug delivery platform with potential applications for mucosal drug delivery and the treatment of persistent infections.
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Affiliation(s)
- V H Giang Phan
- Biomaterials and Nanotechnology Research Group, Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
| | - Huu Thuy Trang Duong
- Department of Pharmaceutical Sciences, University of California, Irvine, California 92697, United States
| | - Phu-Tri Tran
- Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, New York 11794-5215, United States
| | | | - Duy-Khiet Ho
- Department of Bioengineering, School of Medicine, University of Washington, Seattle, Washington 98195, United States
| | - Xabier Murgia
- Kusudama Therapeutics, Parque Científico y Tecnológico de Gipuzkoa, Donostia-San, Sebastián 20014, Spain
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4
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Soliman N, Gasser G, Thomas CM. Incorporation of Ru(II) Polypyridyl Complexes into Nanomaterials for Cancer Therapy and Diagnosis. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2003294. [PMID: 33073433 DOI: 10.1002/adma.202003294] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 06/29/2020] [Indexed: 06/11/2023]
Abstract
Ru(II) polypyridyl complexes are compounds of great interest in cancer therapy due to their unique photophysical, photochemical, and biological properties. For effective treatment, they must be able to penetrate tumor cells effectively and selectively. The development of nanoscale carriers capable of delivering Ru(II) polypyridyl complexes has the potential to passively or selectively enhance their cellular uptake in tumor cells. Many different strategies have been explored to incorporate Ru(II) polypyridyl complexes into a variety of nanosized constructs, ranging from organic to inorganic materials. Herein, recent developments in nanomaterials loaded with Ru(II) polypyridyl complexes are highlighted. Their rational design, preparation, and physicochemical properties are described, and their potential applications in cancer therapy are eventually discussed.
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Affiliation(s)
- Nancy Soliman
- Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie Paris, Paris, 75005, France
- Chimie ParisTech, PSL University, CNRS, Institute of Chemistry for Life and Health Sciences, Laboratory for Inorganic Chemical Biology, Paris, 75005, France
| | - Gilles Gasser
- Chimie ParisTech, PSL University, CNRS, Institute of Chemistry for Life and Health Sciences, Laboratory for Inorganic Chemical Biology, Paris, 75005, France
| | - Christophe M Thomas
- Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie Paris, Paris, 75005, France
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5
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Ho DK, Christmann R, Murgia X, De Rossi C, Frisch S, Koch M, Schaefer UF, Loretz B, Desmaele D, Couvreur P, Lehr CM. Synthesis and Biopharmaceutical Characterization of Amphiphilic Squalenyl Derivative Based Versatile Drug Delivery Platform. Front Chem 2020; 8:584242. [PMID: 33195079 PMCID: PMC7604382 DOI: 10.3389/fchem.2020.584242] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 09/08/2020] [Indexed: 12/15/2022] Open
Abstract
Limited drug loading capacity (LC), mostly below 5% w/w, is a significant drawback of nanoparticulate drug delivery systems (DDS). Squalenoylation technology, which employs bioconjugation of squalenyl moiety and drug, allows self-assemble of nanoparticles (NPs) in aqueous media with significantly high LC (>30% w/w). The synthesis and particle preparation of squalenoylated prodrugs are, however, not facile for molecules with multiple reactive groups. Taking a different approach, we describe the synthesis of amphiphilic squalenyl derivatives (SqDs) as well as the physicochemical and biopharmaceutical characterizations of their self-assembled NPs as DDSs. The SqDs included in this study are (i) cationic squalenyl diethanolamine (ii) PEGylated SqD (PEG 750 Da), (iii) PEGylated SqD (PEG 3,000 Da), and (iv) anionic squalenyl hydrogen sulfate. All four SqDs self-assemble into NPs in a size range from 100 to 200 nm in an aqueous solution. Furthermore, all NP derivatives demonstrate appropriate biocompatibility and adequate colloidal stability in physiological relevant pH environments. The mucoprotein binding of PEGylated NPs is reduced compared to the charged NPs. Most importantly, this technology allows excellent LC (at maximum of 45% w/w) of a wide range of multifunctional compounds, varying in physicochemical properties and molecular weight. Interestingly, the drug release profile can be tuned by different loading methods. In summary, the SqD-based NPs appear as versatile drug delivery platforms.
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Affiliation(s)
- Duy-Khiet Ho
- Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Centre for Infection Research, Saarbrücken, Germany.,Department of Pharmacy, Saarland University, Saarbrücken, Germany
| | - Rebekka Christmann
- Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Centre for Infection Research, Saarbrücken, Germany.,Department of Pharmacy, Saarland University, Saarbrücken, Germany
| | - Xabier Murgia
- Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Centre for Infection Research, Saarbrücken, Germany.,Department of Pharmacy, Saarland University, Saarbrücken, Germany
| | - Chiara De Rossi
- Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Centre for Infection Research, Saarbrücken, Germany
| | - Sarah Frisch
- Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Centre for Infection Research, Saarbrücken, Germany.,Department of Pharmacy, Saarland University, Saarbrücken, Germany
| | - Marcus Koch
- INM-Leibniz Institute for New Materials, Saarbrücken, Germany
| | | | - Brigitta Loretz
- Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Centre for Infection Research, Saarbrücken, Germany
| | - Didier Desmaele
- Faculté de Pharmacie, Institut Galien Paris Sud, Université Paris-Saclay, Chatenay-Malabry, France
| | - Patrick Couvreur
- Faculté de Pharmacie, Institut Galien Paris Sud, Université Paris-Saclay, Chatenay-Malabry, France
| | - Claus-Michael Lehr
- Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Centre for Infection Research, Saarbrücken, Germany.,Department of Pharmacy, Saarland University, Saarbrücken, Germany
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6
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Navarro Chica CE, de Haan BJ, Faas MM, Smink AM, Sierra L, de Vos P, López BL. Design and characterization of Squalene-Gusperimus nanoparticles for modulation of innate immunity. Int J Pharm 2020; 590:119893. [PMID: 32956823 DOI: 10.1016/j.ijpharm.2020.119893] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 07/12/2020] [Accepted: 09/14/2020] [Indexed: 01/18/2023]
Abstract
Immunosuppressive drugs are widely used for the treatment of autoimmune diseases and to prevent rejection in organ transplantation. Gusperimus is a relatively safe immunosuppressive drug with low cytotoxicity and reversible side effects. It is highly hydrophilic and unstable. Therefore, it requires administration in high doses which increases its side effects. To overcome this, here we encapsulated gusperimus as squalene-gusperimus nanoparticles (Sq-GusNPs). These nanoparticles (NPs) were obtained from nanoassembly of the squalene gusperimus (Sq-Gus) bioconjugate in water, which was synthesized starting from squalene. The size, charge, and dispersity of the Sq-GusNPs were optimized using the response surface methodology (RSM). The colloidal stability of the Sq-GusNPs was tested using an experimental block design at different storage temperatures after preparing them at different pH conditions. Sq-GusNPs showed to be colloidally stable, non-cytotoxic, readily taken up by cells, and with an anti-inflammatory effect sustained over time. We demonstrate that gusperimus was stabilized through its conjugation with squalene and subsequent formation of NPs allowing its controlled release. Overall, the Sq-GusNPs have the potential to be used as an alternative in approaches for the treatment of different pathologies where a controlled release of gusperimus could be required.
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Affiliation(s)
- Carlos E Navarro Chica
- Grupo de Investigación Ciencia de los Materiales, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Calle 70 No. 52-21, Medellín, Antioquia, Colombia; Department of Pathology and Medical Biology, Section of Immunoendocrinology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, EA11, 9713 GZ Groningen, The Netherlands.
| | - Bart J de Haan
- Department of Pathology and Medical Biology, Section of Immunoendocrinology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, EA11, 9713 GZ Groningen, The Netherlands
| | - M M Faas
- Department of Pathology and Medical Biology, Section of Immunoendocrinology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, EA11, 9713 GZ Groningen, The Netherlands
| | - Alexandra M Smink
- Department of Pathology and Medical Biology, Section of Immunoendocrinology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, EA11, 9713 GZ Groningen, The Netherlands
| | - Ligia Sierra
- Grupo de Investigación Ciencia de los Materiales, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Calle 70 No. 52-21, Medellín, Antioquia, Colombia
| | - Paul de Vos
- Department of Pathology and Medical Biology, Section of Immunoendocrinology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, EA11, 9713 GZ Groningen, The Netherlands
| | - Betty L López
- Grupo de Investigación Ciencia de los Materiales, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Calle 70 No. 52-21, Medellín, Antioquia, Colombia
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7
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Serafini M, Griglio A, Aprile S, Seiti F, Travelli C, Pattarino F, Grosa G, Sorba G, Genazzani AA, Gonzalez-Rodriguez S, Butron L, Devesa I, Fernandez-Carvajal A, Pirali T, Ferrer-Montiel A. Targeting Transient Receptor Potential Vanilloid 1 (TRPV1) Channel Softly: The Discovery of Passerini Adducts as a Topical Treatment for Inflammatory Skin Disorders. J Med Chem 2018; 61:4436-4455. [DOI: 10.1021/acs.jmedchem.8b00109] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Marta Serafini
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Alessia Griglio
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Silvio Aprile
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Fabio Seiti
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Cristina Travelli
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Franco Pattarino
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Giorgio Grosa
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Giovanni Sorba
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Armando A. Genazzani
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Sara Gonzalez-Rodriguez
- Instituto de Biología Molecular y Celular, Universitas Miguel Hernandez, Av de la Universidad s/n, 03202 Elche, Spain
| | - Laura Butron
- Instituto de Biología Molecular y Celular, Universitas Miguel Hernandez, Av de la Universidad s/n, 03202 Elche, Spain
| | - Isabel Devesa
- AntalGenics, SL. Ed. Quorum III, Parque
Científico UMH, Av de la Universidad s/n, 03202 Elche, Spain
| | - Asia Fernandez-Carvajal
- Instituto de Biología Molecular y Celular, Universitas Miguel Hernandez, Av de la Universidad s/n, 03202 Elche, Spain
| | - Tracey Pirali
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Antonio Ferrer-Montiel
- Instituto de Biología Molecular y Celular, Universitas Miguel Hernandez, Av de la Universidad s/n, 03202 Elche, Spain
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8
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Arpicco S, Battaglia L, Brusa P, Cavalli R, Chirio D, Dosio F, Gallarate M, Milla P, Peira E, Rocco F, Sapino S, Stella B, Ugazio E, Ceruti M. Recent studies on the delivery of hydrophilic drugs in nanoparticulate systems. J Drug Deliv Sci Technol 2016. [DOI: 10.1016/j.jddst.2015.09.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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9
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Lepeltier E, Loretz B, Desmaële D, Zapp J, Herrmann J, Couvreur P, Lehr CM. Squalenoylation of Chitosan: A Platform for Drug Delivery? Biomacromolecules 2015. [DOI: 10.1021/acs.biomac.5b00840] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Elise Lepeltier
- Drug
Delivery (DDEL), Helmholtz-Institute for Pharmaceutical Research Saarland
(HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University, Saarbrücken 66123, Germany
| | - Brigitta Loretz
- Drug
Delivery (DDEL), Helmholtz-Institute for Pharmaceutical Research Saarland
(HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University, Saarbrücken 66123, Germany
| | - Didier Desmaële
- Faculté
de Pharmacie, Institut Galien Paris Sud, Université Paris Sud, UMR CNRS 8612, Paris 92296, France
| | - Josef Zapp
- Institut
für Pharmazeutische Biologie, Saarland University, Saarbrücken 66123, Germany
| | - Jennifer Herrmann
- Microbial
Natural Products, Helmholtz-Institute for Pharmaceutical Research
Saarland (HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University, Saarbrücken 66123, Germany
| | - Patrick Couvreur
- Faculté
de Pharmacie, Institut Galien Paris Sud, Université Paris Sud, UMR CNRS 8612, Paris 92296, France
| | - Claus-Michael Lehr
- Drug
Delivery (DDEL), Helmholtz-Institute for Pharmaceutical Research Saarland
(HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University, Saarbrücken 66123, Germany
- Department
of Pharmacy, Saarland University, Saarbrücken 66123, Germany
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10
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Bertrand JR, Lucas C, Pham NM, Durieu C, Couvreur P, Malvy CP, Desmaële D. Turning Squalene into Cationic Lipid Allows a Delivery of siRNA in Cultured Cells. Nucleic Acid Ther 2015; 25:121-9. [PMID: 25894614 DOI: 10.1089/nat.2014.0504] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Covalent binding of squalene to siRNA has already been shown to be an interesting way of delivering siRNA in vivo. Whether squalene derivatives could also be used to deliver siRNA in cells without covalent binding similar to usual transfection with cationic lipids is the question addressed in this article. Accordingly, we investigated the activity of two squalene derivatives bearing a quaternary ammonium head group and a guanidinium group, respectively. The second derivative displayed interesting properties for delivering siRNA into cells in vitro.
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Affiliation(s)
- Jean-Rémi Bertrand
- 1Université Paris-Sud, Laboratoire de Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203, Villejuif, France.,2Centre National de la Recherche Scientifique (CNRS), Laboratoire de Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203, Villejuif, France.,3Gustave Roussy Cancer Campus Grand Paris, Laboratoire de Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203, Villejuif, France
| | - Claire Lucas
- 1Université Paris-Sud, Laboratoire de Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203, Villejuif, France.,2Centre National de la Recherche Scientifique (CNRS), Laboratoire de Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203, Villejuif, France.,3Gustave Roussy Cancer Campus Grand Paris, Laboratoire de Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203, Villejuif, France
| | - Ngoc Minh Pham
- 1Université Paris-Sud, Laboratoire de Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203, Villejuif, France.,2Centre National de la Recherche Scientifique (CNRS), Laboratoire de Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203, Villejuif, France.,3Gustave Roussy Cancer Campus Grand Paris, Laboratoire de Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203, Villejuif, France
| | - Catherine Durieu
- 4Centre National de la Recherche Scientifique (CNRS), UMR 8126, Villejuif, France
| | - Patrick Couvreur
- 5Université Paris-Sud, Institut Galien, CNRS UMR 8612, Châtenay-Malabry, France
| | - Claude Paul Malvy
- 1Université Paris-Sud, Laboratoire de Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203, Villejuif, France.,2Centre National de la Recherche Scientifique (CNRS), Laboratoire de Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203, Villejuif, France.,3Gustave Roussy Cancer Campus Grand Paris, Laboratoire de Vectorologie et Thérapeutiques Anticancéreuses, UMR 8203, Villejuif, France
| | - Didier Desmaële
- 5Université Paris-Sud, Institut Galien, CNRS UMR 8612, Châtenay-Malabry, France
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11
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Clima L, Peptanariu D, Pinteala M, Salic A, Barboiu M. DyNAvectors: dynamic constitutional vectors for adaptive DNA transfection. Chem Commun (Camb) 2015; 51:17529-31. [DOI: 10.1039/c5cc06715d] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A dynamic constitutional strategy presented here, combining easy synthesis and rapid screening, enables the selection of highly effective Dynamic Constitutional Frameworks (DCFs) for DNA transfection.
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Affiliation(s)
- Lilia Clima
- Petru Poni” Institute of Macromolecular Chemistry of Romanian Academy – 41A
- Iasi
- Romania
| | - Dragos Peptanariu
- Petru Poni” Institute of Macromolecular Chemistry of Romanian Academy – 41A
- Iasi
- Romania
| | - Mariana Pinteala
- Petru Poni” Institute of Macromolecular Chemistry of Romanian Academy – 41A
- Iasi
- Romania
| | - Adrian Salic
- Department of Cell Biology
- Harvard Medical School
- Boston
- USA
| | - Mihail Barboiu
- Adaptative Supramolecular Nanosystems Group
- Institut Européen des Membranes
- ENSCM/UMII/UMR-CNRS 5635
- 34095 Montpellier, Cedex 5
- France
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12
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Cheikh-Ali Z, Caron J, Cojean S, Bories C, Couvreur P, Loiseau PM, Desmaële D, Poupon E, Champy P. "Squalenoylcurcumin" nanoassemblies as water-dispersible drug candidates with antileishmanial activity. ChemMedChem 2014; 10:411-8. [PMID: 25523035 DOI: 10.1002/cmdc.201402449] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2014] [Indexed: 12/21/2022]
Abstract
Curcumin, a natural polyphenolic compound, showed antiparasitic potential, including trypanocidal and leishmanicidal activity, in several in vitro and in vivo models. The molecule is well tolerated in humans. However, it is insoluble in water and displays poor oral bioavailability as a result of low absorption. New derivatives of curcumin were prepared by esterification of one or two of its phenolic groups with 1,1',2-tris-norsqualenic acid. These "squalenoylcurcumins" were formulated as water-dispersible nanoassemblies of homogeneous size, and they proved to be stable. Squalenoylcurcumins were inactive against Trypanosoma brucei brucei trypomastigotes, even as nanoassemblies, in contrast with curcumin. However, against Leishmania donovani promastigotes, the activities of the squalenoylcurcumins and their nanoassemblies were enhanced relative to that of curcumin. In L. donovani axenic and intramacrophagic amastigotes, they showed activity in the range of miltefosine, with good selectivity indexes. In regard to their dispersibility in water and to the safety of curcumin, these nanoassemblies are promising candidates for preclinical study toward the treatment of visceral leishmaniasis.
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Affiliation(s)
- Zakaria Cheikh-Ali
- Laboratoire de Pharmacognosie, CNRS UMR 8076 BioCIS, LabEX LERMIT, Faculté de Pharmacie, Université Paris-Sud, 92296 Châtenay-Malabry (France)
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13
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Borrelli S, Christodoulou MS, Ficarra I, Silvani A, Cappelletti G, Cartelli D, Damia G, Ricci F, Zucchetti M, Dosio F, Passarella D. New class of squalene-based releasable nanoassemblies of paclitaxel, podophyllotoxin, camptothecin and epothilone A. Eur J Med Chem 2014; 85:179-90. [PMID: 25084144 DOI: 10.1016/j.ejmech.2014.07.035] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 05/09/2014] [Accepted: 07/10/2014] [Indexed: 12/23/2022]
Abstract
The present study reports the preparation of a novel class of squalene conjugates with paclitaxel, podophyllotoxin, camptothecin and epothilone A. The obtained compounds are characterized by a squalene tail that makes them able to self-assemble in water, and by a drug unit connected via a disulfide-containing linker to secure the release inside the cell. All the obtained compounds were effectively able to self-assemble and to release the parent drug in vitro. Disulfide-containing paclitaxel-squalene derivative showed a similar biological activity when compared to the free drug. Immunofluorescence assay shows that this squalene conjugate enters A549 cells and stain microtubule bundles. The results described herein pave the way for different classes of squalene-based releasable nanoassemblies.
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Affiliation(s)
- Stella Borrelli
- Dipartimento di Chimica, Università degli Studi di Milano, Via C. Golgi 19, 20133 Milano, Italy
| | - Michael S Christodoulou
- Dipartimento di Chimica, Università degli Studi di Milano, Via C. Golgi 19, 20133 Milano, Italy
| | - Ilaria Ficarra
- Dipartimento di Chimica, Università degli Studi di Milano, Via C. Golgi 19, 20133 Milano, Italy
| | - Alessandra Silvani
- Dipartimento di Chimica, Università degli Studi di Milano, Via C. Golgi 19, 20133 Milano, Italy
| | - Graziella Cappelletti
- Dipartimento di Bioscienze, Università degli Studi di Milano, Via Celoria 26, 20133 Milano, Italy
| | - Daniele Cartelli
- Dipartimento di Bioscienze, Università degli Studi di Milano, Via Celoria 26, 20133 Milano, Italy
| | - Giovanna Damia
- Department of Oncology, IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Via La Masa 19, 20156 Milano, Italy
| | - Francesca Ricci
- Department of Oncology, IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Via La Masa 19, 20156 Milano, Italy
| | - Massimo Zucchetti
- Department of Oncology, IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Via La Masa 19, 20156 Milano, Italy
| | - Franco Dosio
- Dipartimento di Scienza e Tecnologia del Farmaco, Via Giuria 9, 10125 Torino, Italy
| | - Daniele Passarella
- Dipartimento di Chimica, Università degli Studi di Milano, Via C. Golgi 19, 20133 Milano, Italy.
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14
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Lange S, Keller M, Müller C, Oliaro-Bosso S, Balliano G, Bracher F. Aminopropylindenes derived from Grundmann's ketone as a novel chemotype of oxidosqualene cyclase inhibitors. Eur J Med Chem 2013; 63:758-64. [DOI: 10.1016/j.ejmech.2013.03.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 02/15/2013] [Accepted: 03/01/2013] [Indexed: 12/26/2022]
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15
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Caron J, Maksimenko A, Wack S, Lepeltier E, Bourgaux C, Morvan E, Leblanc K, Couvreur P, Desmaële D. Improving the antitumor activity of squalenoyl-paclitaxel conjugate nanoassemblies by manipulating the linker between paclitaxel and squalene. Adv Healthc Mater 2013; 2:172-85. [PMID: 23213041 DOI: 10.1002/adhm.201200099] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Revised: 07/24/2012] [Indexed: 11/06/2022]
Abstract
A series of new lipid prodrugs of paclitaxel, which can be formulated as nanoassemblies, are described. These prodrugs which are designed to overcome the limitations due to the systemic toxicity and low water solubility of paclitaxel consist of a squalene chain bound to the 2'-OH of paclitaxel through a 1,4-cis,cis-dienic linker. This design allows the squalene-conjugates to self-assemble as nanoparticular systems while preserving an efficient release of the free drug, thanks to the dienic spacer. The size, steric hindrance, and functional groups of the spacer have been modulated. All these prodrugs self-assemble into nanosized aggregates in aqueous solution as characterized by dynamic light scattering and transmission electron microscopy and appear stable in water for several days as determined by particle size measurement. In vitro biological assessment shows that these squalenoyl-paclitaxel nanoparticles display notable cytotoxicity on several tumor cell lines including A549 lung cell line, colon cell line HT-29, or KB 3.1 nasopharyngeal epidermoid cell line. The cis,cis-squalenyl-deca-5,8-dienoate prodrug show improved activity over simple 2'-squalenoyl-paclitaxel prodrug highlighting the favourable effect of the dienic linker. The antitumor efficacy of the nanoassemblies constructed with the more active prodrugs has been investigated on human lung (A549) carcinoma xenograft model in mice. The prodrug bearing the cis,cis-deca-5,8-dienoyl linker shows comparable antitumor efficacy to the parent drug, but reveals a much lower subacute toxicity as seen in body weight loss. Thus, nanoparticles with the incorporated squalenoyl paclitaxel prodrug may prove useful for replacement of the toxic Cremophor EL.
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Dosio F, Stella B, Ferrero A, Garino C, Zonari D, Arpicco S, Cattel L, Giordano S, Gobetto R. Ruthenium polypyridyl squalene derivative: A novel self-assembling lipophilic probe for cellular imaging. Int J Pharm 2013; 440:221-8. [DOI: 10.1016/j.ijpharm.2012.07.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Revised: 07/08/2012] [Accepted: 07/13/2012] [Indexed: 10/28/2022]
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17
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Oliaro-Bosso S, Caron G, Taramino S, Ermondi G, Viola F, Balliano G. Characterization of the channel constriction allowing the access of the substrate to the active site of yeast oxidosqualene cyclase. PLoS One 2011; 6:e22134. [PMID: 21811565 PMCID: PMC3141018 DOI: 10.1371/journal.pone.0022134] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Accepted: 06/16/2011] [Indexed: 12/03/2022] Open
Abstract
In oxidosqualene cyclases (OSCs), an enzyme which has been extensively studied as a target for hypocholesterolemic or antifungal drugs, a lipophilic channel connects the surface of the protein with the active site cavity. Active site and channel are separated by a narrow constriction operating as a mobile gate for the substrate passage. In Saccharomyces cerevisiae OSC, two aminoacidic residues of the channel/constriction apparatus, Ala525 and Glu526, were previously showed as critical for maintaining the enzyme functionality. In this work sixteen novel mutants, each bearing a substitution at or around the channel constrictions, were tested for their enzymatic activity. Modelling studies showed that the most functionality-lowering substitutions deeply alter the H-bond network involving the channel/constriction apparatus. A rotation of Tyr239 is proposed as part of the mechanism permitting the access of the substrate to the active site. The inhibition of OSC by squalene was used as a tool for understanding whether the residues under study are involved in a pre-catalytic selection and docking of the substrate oxidosqualene.
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Affiliation(s)
- Simonetta Oliaro-Bosso
- Dipartimento di Scienza e Tecnologia del Farmaco, Facoltà di Farmacia, Università degli Studi di Torino, Turin, Italy
| | - Giulia Caron
- Dipartimento di Scienza e Tecnologia del Farmaco, Facoltà di Farmacia, Università degli Studi di Torino, Turin, Italy
| | - Silvia Taramino
- Dipartimento di Scienza e Tecnologia del Farmaco, Facoltà di Farmacia, Università degli Studi di Torino, Turin, Italy
| | - Giuseppe Ermondi
- Dipartimento di Scienza e Tecnologia del Farmaco, Facoltà di Farmacia, Università degli Studi di Torino, Turin, Italy
| | - Franca Viola
- Dipartimento di Scienza e Tecnologia del Farmaco, Facoltà di Farmacia, Università degli Studi di Torino, Turin, Italy
| | - Gianni Balliano
- Dipartimento di Scienza e Tecnologia del Farmaco, Facoltà di Farmacia, Università degli Studi di Torino, Turin, Italy
- * E-mail:
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18
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Caron J, Lepeltier E, Reddy LH, Lepêtre-Mouelhi S, Wack S, Bourgaux C, Couvreur P, Desmaële D. Squalenoyl Gemcitabine Monophosphate: Synthesis, Characterisation of Nanoassemblies and Biological Evaluation. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100036] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Voyron S, Rocco F, Ceruti M, Forni P, Pla AF, Sarpietro MG, Varese GC, Marchisio VF. Antifungal activity of bis-azasqualenes, inhibitors of oxidosqualene cyclase. Mycoses 2011; 53:481-7. [PMID: 19549106 DOI: 10.1111/j.1439-0507.2009.01742.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The antifungal activity and in vitro toxicity toward animal cells of two inhibitors of oxidosqualene cyclase, squalene bis-diethylamine (SBD) and squalene bis-diethylmethylammonium iodide (SBDI) were studied. Minimum inhibitory concentration (MIC) against dermatophytes and other fungi involved in cutaneous and systemic infections (12 isolates from seven species) were determined by the broth microdilution method based on the reference documents M38-A and M27-A2 of Clinical and Laboratory Standards Institute (CLSI). Both compounds exerted fungistatic activities, although with different action. SBDI was the more active compound and displayed low MIC values (in the 3.12-12.5 μg ml(-1) range) against Microsporum canis, Trichophyton mentagrophytes and one isolate of Scopulariopsis brevicaulis, while SBD showed MIC values against these species in the 3.12-25 μg ml(-1) range. Toxicity was tested on Madin-Darby canine kidney (MDCK) epithelial cells and human microvascular endothelial cells (HMEC). SBDI proved the less toxic compound: it inhibited M. canis, T. mentagrophytes and S. brevicaulis at concentrations below those found toxic for MDCK cells. HMEC were the more sensitive cells.
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Affiliation(s)
- Samuele Voyron
- Dipartimento di Biologia Vegetale, Università degli Studi di Torino, Torino, Italy
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20
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Gupta L, Ramírez A, Collum DB. Reaction of lithium diethylamide with an alkyl bromide and alkyl benzenesulfonate: origins of alkylation, elimination, and sulfonation. J Org Chem 2010; 75:8392-9. [PMID: 21077695 DOI: 10.1021/jo101505x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A combination of NMR, kinetic, and computational methods are used to examine reactions of lithium diethylamide in tetrahydrofuran (THF) with n-dodecyl bromide and n-octyl benzenesulfonate. The alkyl bromide undergoes competitive S(N)2 substitution and E2 elimination in proportions independent of all concentrations except for a minor medium effect. Rate studies show that both reactions occur via trisolvated-monomer-based transition structures. The alkyl benzenesulfonate undergoes competitive S(N)2 substitution (minor) and N-sulfonation (major) with N-sulfonation promoted at low THF concentrations. The S(N)2 substitution is shown to proceed via a disolvated monomer suggested computationally to involve a cyclic transition structure. The dominant N-sulfonation follows a disolvated-dimer-based transition structure suggested computationally to be a bicyclo[3.1.1] form. The differing THF and lithium diethylamide orders for the two reactions explain the observed concentration-dependent chemoselectivities.
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Affiliation(s)
- Lekha Gupta
- Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University Ithaca, New York 14853-1301, United States
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21
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Xiong Z, Busch R, Corey EJ. A short total synthesis of (+)-omaezakianol via an epoxide-initiated cationic cascade reaction. Org Lett 2010; 12:1512-4. [PMID: 20218639 DOI: 10.1021/ol100213e] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
(+)-Omaezakianol was synthesized in only three steps from racemic chlorohydrin 4 by Shi epoxidation followed by cascade cyclization and reduction.
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Affiliation(s)
- Zhaoming Xiong
- Department of Medicinal Chemistry, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, USA.
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22
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Caron J, Reddy LH, Lepêtre-Mouelhi S, Wack S, Clayette P, Rogez-Kreuz C, Yousfi R, Couvreur P, Desmaële D. Squalenoyl nucleoside monophosphate nanoassemblies: new prodrug strategy for the delivery of nucleotide analogues. Bioorg Med Chem Lett 2010; 20:2761-4. [PMID: 20363623 DOI: 10.1016/j.bmcl.2010.03.070] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2010] [Revised: 03/16/2010] [Accepted: 03/16/2010] [Indexed: 10/19/2022]
Abstract
4-(N)-1,1',2-trisnor-squalenoyldideoxycytidine monophosphate (SQddC-MP) and 4-(N)-1,1',2-trisnor-squalenoylgemcitabine monophosphate (SQdFdC-MP) were synthesized using phosphoramidite chemistry. These amphiphilic molecules self-assembled to about hundred nanometers size nanoassemblies in aqueous medium. Nanoassemblies of SQddC-MP displayed significant anti-HIV activity whereas SQdFdC-MP nanoassemblies displayed promising anticancer activity on leukemia cells. These results suggested that squalene conjugate of negatively charged nucleotide analogues efficiently penetrated within cells. Thus, we propose a new prodrug strategy for improved delivery of nucleoside analogues to ameliorate their biological efficacy.
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Affiliation(s)
- Joachim Caron
- Université Paris-Sud, Faculté de Pharmacie, UMR CNRS 8076, 5 rue J.-B. Clément, 92296 Châtenay-Malabry, France
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23
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Oliaro-Bosso S, Taramino S, Viola F, Tagliapietra S, Ermondi G, Cravotto G, Balliano G. Umbelliferone aminoalkyl derivatives as inhibitors of human oxidosqualene-lanosterol cyclase. J Enzyme Inhib Med Chem 2009; 24:589-98. [PMID: 18830877 DOI: 10.1080/14756360802318688] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Human and murine lanosterol synthases (EC 5.4.99.7) were studied as targets of a series of umbelliferone aminoalkyl derivatives previously tested as inhibitors of oxidosqualene cyclases from other eukaryotes. Tests were carried out on cell cultures of human keratinocytes and mouse 3T3 fibroblasts incubated with radiolabeled acetate, and on homogenates prepared from yeast cells expressing human lanosterol synthase, incubated with radiolabeled oxidosqualene. In cell cultures of both human keratinocytes and mouse 3T3 fibroblasts, the observed inhibition of cholesterol biosynthesis was selective for oxidosqualene cyclase. The most active compounds bear an allylmethylamino chain in position-7 of the coumarin ring. The inhibition was critically dependent on the position and length of the inhibitor side chain, as well as on the type of aminoalkyl group inserted at the end of the same chain. Molecular docking analyses, carried out to clarify details of inhibitors/enzyme interactions, proved useful to explain the observed differences in inhibitory activities.
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Affiliation(s)
- Simonetta Oliaro-Bosso
- Dipartimento di Scienza e Tecnologia del Farmaco, Universita degli Studi di Torino, Turin, Italy
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24
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Lee HT, Picard JA. Review: Cardiovascular & Renal Recent developments in hypocholesterolaemic agents. Expert Opin Ther Pat 2008. [DOI: 10.1517/13543776.5.5.397] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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25
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Oliaro-Bosso S, Viola F, Taramino S, Tagliapietra S, Barge A, Cravotto G, Balliano G. Inhibitory Effect of Umbelliferone Aminoalkyl Derivatives on Oxidosqualene Cyclases fromS. cerevisiae,T. cruzi,P. carinii,H. sapiens, andA. thaliana: a Structure–Activity Study. ChemMedChem 2007; 2:226-33. [PMID: 17154325 DOI: 10.1002/cmdc.200600234] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Eighteen coumarin derivatives were tested as inhibitors of oxidosqualene cyclases (OSCs) from Saccharomyces cerevisiae, Trypanosoma cruzi, Pneumocystis carinii, Homo sapiens, and Arabidopsis thaliana, all expressed in an OSC-defective strain of S. cerevisiae.35 All the compounds have an aminoalkyl chain bound to an aromatic nucleus; unconventional synthetic procedures (microwave- and ultrasound-promoted reactions) were successfully used to prepare some of them. The most interesting structure-dependent difference in inhibitory activities was observed with an N-oxide group replacement of the tertiary amino group at the end of the side chain. An interesting species specificity also emerged: T. cruzi OSC was the least sensitive enzyme; P. carinii and A. thaliana OSCs were the most sensitive. The remarkable activities of three compounds on the T. cruzi enzyme and of five of them on the P. carinii enzyme suggest the present series as a promising compound family for the development of novel antiparasitic agents.
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Affiliation(s)
- Simonetta Oliaro-Bosso
- Dipartimento di Scienza e Tecnologia del Farmaco, Università degli Studi di Torino, via P. Giuria 9, 10125 Turin, Italy
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26
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Oliaro-Bosso S, Schulz-Gasch T, Balliano G, Viola F. Access of the substrate to the active site of yeast oxidosqualene cyclase: an inhibition and site-directed mutagenesis approach. Chembiochem 2006; 6:2221-8. [PMID: 16235265 DOI: 10.1002/cbic.200500107] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A structural model of Saccharomyces cerevisiae oxidosqualene cyclase (SceOSC) suggests that some residues of the conserved sequence Pro-Ala-Glu-Val-Phe-Gly (residues 524-529) belong to a channel constriction that gives access to the active-site cavity. Starting from the SceOSC C457D mutant, which lacks the cysteine residue next to the catalytic Asp456 residue Cys457 has been replaced but Asp456 is still there, we prepared two further mutants where the wild-type residues Ala525 and Glu526 were individually replaced by cysteine. These mutants, especially E526C, were very sensitive to the thiol-reacting agent dodecyl-maleimide. Moreover, both the specific activity and the thermal stability of E526C were severely reduced. A similar decrease of the enzyme functionality was obtained by replacing Glu526 with alanine, while substitution with the conservative residues aspartate or glutamine did not alter catalytic activity. Molecular modeling of the yeast wild-type OSC and mutants on the template structure of human OSC confirms that the channel constriction is an important aspect of the protein structure and suggests a critical structural role for Glu526.
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Affiliation(s)
- Simonetta Oliaro-Bosso
- Dipartimento di Scienza e Tecnologia del Farmaco, Facoltà di Farmacia, Università degli Studi di Torino, Via Pietro Giuria 9, 10125 Turin, Italy
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27
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Abdel-Magid AF, Mehrman SJ. A Review on the Use of Sodium Triacetoxyborohydride in the Reductive Amination of Ketones and Aldehydes. Org Process Res Dev 2006. [DOI: 10.1021/op0601013] [Citation(s) in RCA: 336] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ahmed F. Abdel-Magid
- Johnson & Johnson Pharmaceutical Research and Development, L.L.C., Department of Chemical Development, Spring House, Pennsylvania 19477, U.S.A
| | - Steven J. Mehrman
- Johnson & Johnson Pharmaceutical Research and Development, L.L.C., Department of Chemical Development, Spring House, Pennsylvania 19477, U.S.A
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28
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Ceruti M, Grosa G, Rocco F, Dosio F, Cattel L. A convenient synthesis of [3-3H]squalene and [3-3H]-2,3-oxidosqualene. J Labelled Comp Radiopharm 2006. [DOI: 10.1002/jlcr.2580340613] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Oliaro-Bosso S, Ceruti M, Balliano G, Milla P, Rocco F, Viola F. Analogs of squalene and oxidosqualene inhibit oxidosqualene cyclase of Trypanosoma cruzi expressed in Saccharomyces cerevisiae. Lipids 2005; 40:1257-62. [PMID: 16477810 DOI: 10.1007/s11745-005-1493-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Recently, a number of inhibitors of the enzyme oxidosqualene cyclase (OSC; EC 5.4.99.7), a key enzyme in sterol biosynthesis, were shown to inhibit in mammalian cells the multiplication of Trypanosoma cruzi, the parasite agent of Chagas' disease. The gene coding for the OSC of T. cruzi has been cloned and expressed in Saccharomyces cerevisiae. The expression in yeast cells could be a safe and easy model for studying the activity and the selectivity of the potential inhibitors of T. cruzi OSC. Using a homogenate of S. cerevisiae cells expressing T. cruzi OSC, we have tested 19 inhibitors: aza, methylidene, vinyl sulfide, and conjugated vinyl sulfide derivatives of oxidosqualene and squalene, selected as representative of different classes of substrate analog inhibitors of OSC. The IC50 values of inhibition (the compound concentration at which the enzyme is inhibited by 50%) are compared with the values obtained using OSC of pig liver and S. cerevisiae. Many inhibitors of pig liver and S. cerevisiae OSC show comparable IC50 for T. cruzi OSC, but some phenylthiovinyl derivatives are 10-100 times more effective on the T. cruzi enzyme than on the pig or S. cerevisiae enzymes. The expression of proteins of pathogenic organisms in yeast seems very promising for preliminary screening of compounds that have potential therapeutic activity.
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Affiliation(s)
- Simonetta Oliaro-Bosso
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, 10125 Turin, Italy
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30
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Ceruti M, Balliano G, Rocco F, Lenhart A, Schulz GE, Castelli F, Milla P. Synthesis and biological activity of new lodoacetamide derivatives on mutants of squalene-hopene cyclase. Lipids 2005; 40:729-35. [PMID: 16196424 DOI: 10.1007/s11745-005-1436-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
New iodoacetamide derivatives, containing a dodecyl or a squalenyl moiety, were synthesized. The effect of these new thiol-reacting molecules was studied on two mutants of Alicyclobacillus acidocaldarius squalene-hopene cyclase constructed especially for this purpose. In the quintuple mutant, all five cysteine residues of the enzyme are substituted with serine; in the sextuple mutant, this quintuple substitution is accompanied by the substitution of aspartate D376, located at the enzyme's active site, with a cysteine. N-Dodecyliodoacetamide had little activity toward either mutant, whereas N-squalenyliodoacetamide showed a stronger effect on the sextuple than on the quintuple mutant, as expected.
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Affiliation(s)
- Maurizio Ceruti
- Dipartimento di Scienza e Tecnologia del Farmaco, Università degli Studi di Torino, 10125 Torino, Italy
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Abstract
Poly(2-alkyl-1,3-oxazoline)s (alkyl = methyl, ethyl) with terminal quarternary ammonium groups were synthesized. It could be shown by NMR and ESI-MS that the termination of the living polymerization with N,N-dimethylalkyl(butyl to hexadecyl)amines was quantitative. The novel functions were investigated regarding their antimicrobial potential toward the bacterium Staphylococcus aureus revealing that only quarternary ammonium functions with 12 and more carbons are antibacterial. Using a novel bifunctional initiator, 3-[(tert-butoxycarbonyl)amino]benzyl-p-toluenesulfonate, poly(oxazoline) with a primary amino group at the starting end and an antimicrobial function at the terminal could be synthesized, as confirmed by NMR and ESI-MS measurements. Comparing the bioactivity of polymers with different functions at the starting end and terminated with dimethyldodecylamine revealed that the starting group has a great effect on the antibacterial properties of the distant terminal. The minimal inhibitory concentrations varied from 0.1 mM for polymer derivatives with a BOC-NH-phenyl starting group to 4 mM for poly(oxazoline)s with a free primary amine at the starting end.
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Affiliation(s)
- Christian J Waschinski
- Freiburg Materials Research Center and Institute for Macromolecular Chemistry, Department of Chemistry, Albert-Ludwigs-Universität Freiburg, Stefan-Meier-Str. 21, 79104 Freiburg, Germany
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32
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Waschinski CJ, Herdes V, Schueler F, Tiller JC. Influence of Satellite Groups on Telechelic Antimicrobial Functions of Polyoxazolines. Macromol Biosci 2005; 5:149-56. [PMID: 15719430 DOI: 10.1002/mabi.200400169] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The antimicrobial activity of poly(alkyloxazoline) telechelics with one quaternary N,N-dimethyldodecylammonium (DDA) end group was found to be greatly controlled by the non-bioactive distal end group, the so-called satellite group. In systematic investigations, the nature of the latter groups was varied to explore the mechanism of the satellite effect. To this end, poly(2-alkyl-1,3-oxazoline)s (alkyl = ethyl, methyl) with a DDA-group at the terminating end and varying alkyl, aminoalkyl, and polyphenyloxazoline block satellite groups, have been synthesized. Poly(oxazoline) derivatives with polydispersity indices of 1.06-1.20 and molecular weights from 2,200 to 12,800 g . mol(-1) could be obtained. The macromolecular structures have been confirmed by NMR spectroscopy and ESI-MS measurements. The polymers were investigated with regard to their antibacterial efficiency towards the Gram-positive bacterium Staphylococcus aureus and the Gram-negative bacterium Escherichia coli. It was found that the introduction of alkyl chain satellites of 4-10 carbon atoms in length afforded antimicrobial activity of the polymers against both microbes that was about 2-3 times higher than that of the well-known structurally comparable low molecular weight biocide, dodecyltrimethylammonium chloride (DTAC). Based on the antimicrobial effects of the investigated polymers, a mechanism for the satellite effect was proposed.
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Affiliation(s)
- Christian J Waschinski
- Freiburg Materials Research Center and Institute for Macromolecular Chemistry, University of Freiburg, Germany
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33
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Arpicco S, Canevari S, Ceruti M, Galmozzi E, Rocco F, Cattel L. Synthesis, characterization and transfection activity of new saturated and unsaturated cationic lipids. ACTA ACUST UNITED AC 2004; 59:869-78. [PMID: 15544791 DOI: 10.1016/j.farmac.2004.06.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2004] [Accepted: 06/15/2004] [Indexed: 11/29/2022]
Abstract
We synthesized new cationic lipids, analogue to N-[1-(2,3-dioleoyloxy)propyl]-N,N,N-trimethylammonium chloride (DOTMA) and 1,2-dimyristyloxypropyl-3-dimethyl-hydroxyethylammonium bromide (DMRIE), in order to compare those containing a dodecyl chain with those having a relatively long chain with two or five double bonds, such as squalenyl and dihydrofarnesyl derivatives, or complex saturated structures, such as squalane derivatives. The fusogenic helper lipid dioleoylphosphatidylethanolamine (DOPE) was added to cationic lipids to form a stable complex. Liposomes composed of 50:50 w/w cationic lipid/DOPE were prepared and incubated with plasmidic DNA at various charge ratios and the diameter and zeta potential of the complexes were measured. The surface charge of the DNA/lipid complexes can be controlled by adjusting the cationic lipid/DNA ratio. Finally, we tested the in vitro transfection efficiency of the cationic lipid/DNA complexes using different cell lines. The transfection efficiency was highest for the dodecyloxy derivative containing a single hydroxyethyl group in the head, followed by the dodecyloxy and the farnesyloxy trimethylammonium derivatives. Instead the C27 squalenyl and C27 squalanyl derivatives resulted inactive.
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Affiliation(s)
- Silvia Arpicco
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Via Pietro Giuria 9, 10125 Torino, Italy
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34
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Oliaro-Bosso S, Viola F, Matsuda S, Cravotto G, Tagliapietra S, Balliano G. Umbelliferone aminoalkyl derivatives as inhibitors of oxidosqualene cyclases from Saccharomyces cerevisiae, Tripanosoma cruzi, and Pneumocystis carinii. Lipids 2004; 39:1007-12. [PMID: 15691023 DOI: 10.1007/s11745-004-1323-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A series of umbelliferone aminoalkyl derivatives, previously studied as inhibitors of squalene-hopene cyclase, were tested as inhibitors of yeast (Saccharomyces cerevisiae) oxidosqualene cyclase (OSC) and OSC from Trypanosoma cruzi and Pneumocystis carinii expressed in yeast. Enzymes from these pathogens were included in this study to provide a preliminary screening for antiparasitic activity. Tests were carried out both on cell homogenates incubated with radiolabeled oxidosqualene and on spheroplasts incubated with radiolabeled acetate. Derivatives bearing a methylallylamino group were the most effective on all of the three enzymes. The P. carinii enzyme was the most susceptible to the action of the inhibitors, with IC50 values for almost all of them ranging from 0.1 to 1 microM. The T. cruzi enzyme was appreciably inhibited (IC50 4-5 microM) only by derivatives bearing a methylallylaminoalkyl flexible chain. Results identify a particularly promising new family of OSC inhibitors, for the development of novel antiparasitic agents.
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Affiliation(s)
- Simonetta Oliaro-Bosso
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, 10125 Turin, Italy
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35
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Reinert DJ, Balliano G, Schulz GE. Conversion of Squalene to the Pentacarbocyclic Hopene. ACTA ACUST UNITED AC 2004; 11:121-6. [PMID: 15113001 DOI: 10.1016/j.chembiol.2003.12.013] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2003] [Accepted: 11/06/2003] [Indexed: 10/21/2022]
Abstract
The membrane protein squalene-hopene cyclase was cocrystallized with 2-azasqualene and analyzed by X-ray diffraction to 2.13 A resolution. The conformation of this close analog was clearly established, and it agreed with the common textbook presentation. The bound squalene undergoes only small conformational changes during the formation of rings A through D, thus requiring no intermediate. However, ring E formation is hindered by an entropic barrier, which may explain its absence in the steroids. The structure analysis revealed a mobile region between the active center cavity and the membrane, which may melt, opening a passage for squalene and hopene.
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Affiliation(s)
- Dirk J Reinert
- Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität, Albertstr. 21, D-79104 Freiburg, Germany
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36
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Rocco F, Bosso SO, Viola F, Milla P, Roma G, Grossi G, Ceruti M. Conjugated methyl sulfide and phenyl sulfide derivatives of oxidosqualene as inhibitors of oxidosqualene and squalene-hopene cyclases. Lipids 2003; 38:201-7. [PMID: 12784859 DOI: 10.1007/s11745-003-1052-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Various (1E,3E)- and (1Z,3E)-conjugated methylthio derivatives of oxidosqualene (OS) and conjugated and non-conjugated phenylthio derivatives of OS were obtained. These compounds, designed as inhibitors of pig liver and Saccharomyces cerevisiae 2,3-oxidosqualene-lanosterol cyclases (OSC) (EC 5.4.99.7) and of Alicyclobacillus acidocaldarius squalene-hopene cyclase (SHC) (EC 5.4.99.-), contain the reactive function adjacent to carbons involved in the formation of the third and the fourth cycle during OS cyclization. All the new compounds are inhibitors of OSC and SHC, with various degrees of selectivity. The conjugated methylthio derivatives behaved as potent inhibitors of S. cerevisiae OSC, whereas most of the phenylthio derivatives were especially active toward SHC.
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Affiliation(s)
- Flavio Rocco
- Dipartimento di Scienza e Tecnologia del Farmaco, Università degli Studi di Torino, 10125 Torino, Italy
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37
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Milla P, Lenhart A, Grosa G, Viola F, Weihofen WA, Schulz GE, Balliano G. Thiol-modifying inhibitors for understanding squalene cyclase function. EUROPEAN JOURNAL OF BIOCHEMISTRY 2002; 269:2108-16. [PMID: 11985588 DOI: 10.1046/j.1432-1033.2002.02861.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The function of squalene-hopene cyclase from Alicyclobacillus acidocaldarius was studied by labelling critical cysteine residues of the enzyme, either native or inserted by site-directed mutagenesis, with different thiol-reacting molecules. The access of the substrate to the active centre cavity through a nonpolar channel that contains a narrow constriction harbouring a cysteine residue (C435) was probed by labelling experiments on both a C435S mutant, lacking C435 of the channel constriction, and a C25S/C50S/C455S/C537S mutant, bearing C435 as the only cysteine residue. Labelling experiments with tritiated 3-carboxy-4-nitrophenyl-dithio-1,1',2-trisnorsqualene (CNDT-squalene) showed that the cysteine residue at the channel constriction was covalently modified by the squalene-like inhibitor. Time-dependent inactivation of the C25S/C50S/C455S/C537S mutant by a number of squalene analogues and other agents with thiol-modifying activity suggested that modifying C435 caused the obstruction of the channel constriction thus blocking access of the substrate to the active site. The tryptic fragment comprising C435 of the quadruple mutant labelled with the most effective inhibitor had the expected altered molecular mass, as determined by LC-ESI-MS measurements. The arrangement of the substrate in the active site cavity was studied by using thiol reagents as probes in labelling experiments with the double mutant D376C/C435S in which D376, supposedly the substrate-protonating residue, was substituted by cysteine. The inhibitory effect was evaluated in terms of the reduced ability to cyclize oxidosqualene, as the mutant is unable to catalyse the reaction of squalene to hopene. Among the inhibitors tested, the substrate analogue squalene-maleimide proved to be a very effective time-dependent inhibitor.
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Affiliation(s)
- Paola Milla
- Università degli Studi di Torino, Dipartimento di Scienza e Tecnologia del Farmaco, Torino, Italy
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38
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Binet J, Thomas D, Benmbarek A, de FD, Renaut P. Structure activity relationships of new inhibitors of mammalian 2,3-oxidosqualene cyclase designed from isoquinoline derivatives. Chem Pharm Bull (Tokyo) 2002; 50:316-29. [PMID: 11911193 DOI: 10.1248/cpb.50.316] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have designed more potent inhibitors from the previously reported LF 05-0038, a 6-isoquinolinol based inhibitor of 2,3-oxidosqualene cyclase (IC50: 1.1 microM). Replacement of the 3-OH group by various 3-substituted amino groups, and modification of the alkyl chain borne by the endocyclic nitrogen led to inhibitors with IC50 in the range of 0.15 to 1 microM. In a second step, opening of the bicyclic ring system afforded the corresponding aminoalkylpiperidines which were slightly more potent. Finally, introduction of suitable aromatic containing moieties on the piperidine nitrogen yielded very potent inhibitors such as 20x (IC50 = 18 nM) easy to synthesize and achiral. The recent availability of the crystal structure of squalene-hopene cyclase allowed us to construct a three-dimensional (3D) model of the related 2,3-oxidosqualene cyclase (OSC) which was tentatively used to describe the possible mode of binding of our compounds and which can be useful for designing new inhibitors.
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39
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Ceruti M, Balliano G, Rocco F, Milla P, Arpicco S, Cattel L, Viola F. Vinyl sulfide derivatives of truncated oxidosqualene as selective inhibitors of oxidosqualene and squalene-hopene cyclases. Lipids 2001; 36:629-36. [PMID: 11485168 DOI: 10.1007/s11745-001-0767-8] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Various vinyl sulfide and ketene dithioacetal derivatives of truncated 2,3-oxidosqualene were developed. These compounds, having the reactive functions at positions C-2, C-15 and C-19 of the squalene skeleton, were studied as inhibitors of pig liver and Saccharomyces cerevisiae oxidosqualene cyclases (OSC) (EC 5.4.99.7) and of Alicyclobacillus acidocaldarius squalene hopene cyclase (SHC) (EC 5.4.99.-). They contain one or two sulfur atoms in alpha-skeletal position to carbons considered to be cationic during enzymatic cyclization of the substrate and should strongly interact with enzyme nucleophiles of the active site. Most of the new compounds are inhibitors of the OSC and of SHC, with various degrees of selectivity. The methylthiovinyl derivative, having the reactive group at position 19, was the most potent and selective inhibitor of the series toward S. cerevisiae OSC, with a concentration inhibiting 500% of the activity of 50 nM, while toward the animal enzyme it was 20 times less potent. These results could offer new insight for the design of antifungal drugs.
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Affiliation(s)
- M Ceruti
- Dipartimento Farmacochimico, Tossicologico e Biologico, Università di Palermo, Italy
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40
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Benayoud F, Abouabdellah A, Richard C, Bonnet-Delpon D, Bégué JP, Levasseur D, Boutaud O, Schuber F. Trifluoromethyl ketones derived from squalene: inhibition of the cholesterol biosynthesis in HepG2 cells. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)01066-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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41
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Viola F, Ceruti M, Cattel L, Milla P, Poralla K, Balliano G. Rationally designed inhibitors as tools for comparing the mechanism of squalene-hopene cyclase with oxidosqualene cyclase. Lipids 2000; 35:297-303. [PMID: 10783007 DOI: 10.1007/s11745-000-0526-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The inhibition of squalene-hopene cyclase (SHC) (E.C. 5.4.99.-), an enzyme of bacterial membranes catalyzing the formation of pentacyclic sterol-like triterpenes, was studied by using different classes of compounds originally developed as inhibitors of oxidosqualene cyclase (OSC) (E.C. 5.4.99.7), the enzyme of eukaryotes responsible for the formation of tetracyclic precursors of sterols. The mechanism of cyclization of squalene by SHC, beginning with a protonation of the 2,3 double bond by an acidic residue of the enzyme, followed by a series of electrophilic additions of the carbocationic intermediates to the double bonds, is similar to the mechanism of cyclization of 2,3-oxidosqualene by OSC. The inhibitors studied included: (i) analogs of the carbocationic intermediates formed during cyclization, such as aza-analogs of squalene and 2,3-oxidosqualene; (ii) affinity-labeling inhibitors bearing a methylidene reactive group; and (iii) vinyldioxidosqualenes and vinylsulfide derivatives of the substrates. Comparison of the results obtained with the two enzymes, SHC and OSC, showed that many of the most effective inhibitors of OSC were also able to inhibit SHC, while some derivatives acted as specific inhibitors. Differences could be easily explained on the basis of the different substrate specificity of the two enzymes.
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Affiliation(s)
- F Viola
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Italy
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42
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Viola F, Balliano G, Milla P, Cattel L, Rocco F, Ceruti M. Stereospecific syntheses of trans-vinyldioxidosqualene and 3-hydroxysulfide derivatives, as potent and time-dependent 2,3-oxidosqualene cyclase inhibitors. Bioorg Med Chem 2000; 8:223-32. [PMID: 10968281 DOI: 10.1016/s0968-0896(99)00286-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
trans-Vinyldioxidosqualene and beta-hydroxysulfide derivatives were synthesized stereospecifically and evaluated as inhibitors of animal and yeast oxidosqualene cyclases. Only trans-vinyldioxidosqualene and 2,3-epoxy-vinyl-beta-hydroxysulfides, having the reactive function at crucial positions 14,15 and 18,19, were active as inhibitors of animal and yeast cyclases. (14-trans)-28-Methylidene-2,3: 14,15-dioxidoundecanorsqualene 27 was the most potent inhibitor of the series of pig liver cyclase, with an IC50 of 0.4 microM, and it behaved also as the most active time-dependent inhibitor of the animal enzyme.
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Affiliation(s)
- F Viola
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Italy
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43
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Pogliani L, Milanesio M, Ceruti M, Viterbo D. Conformational and dynamical study of squalene derivatives. III: azasqualenes and solvated squalene. Chem Phys Lipids 1999. [DOI: 10.1016/s0009-3084(99)00063-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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44
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Milla P, Viola F, Ceruti M, Rocco F, Cattel L, Balliano G. 19-Azasqualene-2,3-epoxide and its N-oxide: metabolic fate and inhibitory effect on sterol biosynthesis in Saccharomyces cerevisiae. Lipids 1999; 34:681-8. [PMID: 10478925 DOI: 10.1007/s11745-999-0413-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
19-Azasqualene-2,3-epoxide was more inhibitory than the corresponding N-oxide against 2,3-oxidosqualene cyclase (OSC) solubilized from Saccharomyces cerevisiae (IC50 7+/-2 and 25+/-5 microM, respectively). Both compounds showed a reversible, noncompetitive-type inhibition on solubilized OSC. Different inhibitory properties between the compounds were especially evident when measuring [14C]acetate incorporation into nonsaponifiable lipids extracted from treated cells. In cells treated with 19-azasqualene-2,3-epoxide at 30 microM, the radioactivity associated with the oxidosqualene fraction, which was negligible in the controls, rose to over 40% of the nonsaponifiable lipids, whereas it remained at a slightly appreciable level in cells treated with the N-oxide derivative under the same conditions. 19-Azasqualene-2,3-epoxide was also more effective than the N-oxide as a cell growth inhibitor (minimal concentration of compound needed to inhibit yeast growth: 45 and >100 microM, respectively). The two inhibitors underwent different metabolic fates in the yeast: while 19-azasqualene-2,3-epoxide did not undergo any transformation, its N-oxide was actively reduced to the corresponding amine in whole and in "ultrasonically stimulated" cells. The N-oxide reductases responsible for this transformation appear to be largely confined within the microsomal fractions and require NADPH for their activity. A possible relationship between the inhibitory properties of the two compounds and their metabolic fates is discussed.
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Affiliation(s)
- P Milla
- Dipartimento di Scienza e Tecnologia del Farmaco, Torino, Italy
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45
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Cattel L, Ceruti M. Inhibitors of 2,3-oxidosqualene cyclase as tools for studying the mechanism and function of the enzyme. Crit Rev Biochem Mol Biol 1998; 33:353-73. [PMID: 9827705 DOI: 10.1080/10409239891204378] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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46
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Polak A. Antifungal therapy, an everlasting battle. PROGRESS IN DRUG RESEARCH. FORTSCHRITTE DER ARZNEIMITTELFORSCHUNG. PROGRES DES RECHERCHES PHARMACEUTIQUES 1997; 49:219-318. [PMID: 9388389 DOI: 10.1007/978-3-0348-8863-9_7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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47
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Ro 48-8.071, a new 2,3-oxidosqualene:lanosterol cyclase inhibitor lowering plasma cholesterol in hamsters, squirrel monkeys, and minipigs: comparison to simvastatin. J Lipid Res 1997. [DOI: 10.1016/s0022-2275(20)37449-6] [Citation(s) in RCA: 123] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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48
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Barth MM, Binet JL, Thomas DM, de Fornel DC, Samreth S, Schuber FJ, Renaut PP. Structural and stereoelectronic requirements for the inhibition of mammalian 2,3-oxidosqualene cyclase by substituted isoquinoline derivatives. J Med Chem 1996; 39:2302-12. [PMID: 8691425 DOI: 10.1021/jm9504621] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
2,3-Oxidosqualene lanosterol-cyclase (OSC; EC 5.4.99.7) is an attractive target for the design of compounds that block hepatic cholesterol biosynthesis. (4a alpha, 5 alpha, 6 beta, 8a beta)-Decahydro-5,8a-dimethyl-2-(1,5,9-trimethyldecyl)-6- isoquinolinol (1) and simplified analogs have been devised to inhibit this enzyme by mimicking the postulated pro-C-8 high-energy intermediary carbocation occurring during the cyclization-rearrangement pathway. In order to gain an understanding into the mechanism by which these types of molecules inhibit OSC, we have synthesized a series of substituted isoquinoline derivatives 3 and investigated the structural and stereoelectronic requirements, and their stringency, that make 3 potential high-energy intermediate analogs of OSC. Determination of the IC50 values of the different compounds with rat liver microsomal cyclase, allowed the study of the relative importance of (i) the nature and the stereochemistry of the nitrogen side chain, (ii) the presence of methyl groups at C-5 and C-8a (ring junction), (iii) the presence and stereochemistry of the C-6 hydroxyl group, (iv) the nature of the ring junction, and (v) the absolute configuration of the bicyclic system. The resulting structure-activity relationships seem to validate the mechanism of action of these inhibitors as analogs of a pro-C-8 high-energy intermediate and delineate the minimal requirements for the design of efficient isoquinoline-based, or simplified, OSC inhibitors.
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Affiliation(s)
- M M Barth
- Laboratoires Fournier SCA, Daix, France
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49
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Abdel-Magid AF, Carson KG, Harris BD, Maryanoff CA, Shah RD. Reductive Amination of Aldehydes and Ketones with Sodium Triacetoxyborohydride. Studies on Direct and Indirect Reductive Amination Procedures(1). J Org Chem 1996; 61:3849-3862. [PMID: 11667239 DOI: 10.1021/jo960057x] [Citation(s) in RCA: 1181] [Impact Index Per Article: 42.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Sodium triacetoxyborohydride is presented as a general reducing agent for the reductive amination of aldehydes and ketones. Procedures for using this mild and selective reagent have been developed for a wide variety of substrates. The scope of the reaction includes aliphatic acyclic and cyclic ketones, aliphatic and aromatic aldehydes, and primary and secondary amines including a variety of weakly basic and nonbasic amines. Limitations include reactions with aromatic and unsaturated ketones and some sterically hindered ketones and amines. 1,2-Dichloroethane (DCE) is the preferred reaction solvent, but reactions can also be carried out in tetrahydrofuran (THF) and occasionally in acetonitrile. Acetic acid may be used as catalyst with ketone reactions, but it is generally not needed with aldehydes. The procedure is carried out effectively in the presence of acid sensitive functional groups such as acetals and ketals; it can also be carried out in the presence of reducible functional groups such as C-C multiple bonds and cyano and nitro groups. Reactions are generally faster in DCE than in THF, and in both solvents, reactions are faster in the presence of AcOH. In comparison with other reductive amination procedures such as NaBH(3)CN/MeOH, borane-pyridine, and catalytic hydrogenation, NaBH(OAc)(3) gave consistently higher yields and fewer side products. In the reductive amination of some aldehydes with primary amines where dialkylation is a problem we adopted a stepwise procedure involving imine formation in MeOH followed by reduction with NaBH(4).
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Affiliation(s)
- Ahmed F. Abdel-Magid
- The R. W. Johnson Pharmaceutical Research Institute, Department of Chemical Development, Spring House, Pennsylvania 19477
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50
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Airaudi D, Ceruti M, Giannetta A, Filipello Marchisio V. Preliminary screening of some squalenoid derivatives for toxicity towards dermatophytes. Mycoses 1995; 38:311-5. [PMID: 8559196 DOI: 10.1111/j.1439-0507.1995.tb00414.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
We report a preliminary study of the in vitro anti-dermatophyte activity of six squalenoid derivatives that inhibit 2,3-oxidosqualene cyclase and squalene epoxidase: 2-aza-2,3-dihydrosqualene, 22,23-epoxy-2-aza-2,3-dihydrosqualene, azasqualene alcohol, 19-aza-18,19,22,23-tetrahydrosqualene, 2,3-epoxy-19-aza-18,19,22,23-tetrahydrosqualene and hexafluorosqualene epoxide. The tests were done by inoculating 10 microliters of Trichophyton mentagrophytes (Robin) Blanchard or Microsporum canis Bodin homogenate into 1 ml of Sabouraud glucose liquid medium containing serial dilutions from 100 to 0.25 micrograms ml-1 of the substance. For each compound the minimum inhibitory concentration (MIC) and the minimum fungicidal concentration (MFC) were determined. The most effective compounds were 22,23-epoxy-2-aza-2,3-dihydrosqualene and azasqualene alcohol, with MICs respectively of 3 and 6.25 micrograms ml-1 for each of the two species of dermatophyte. The first of these compounds was the only one to show fungicidal activity over the range of concentrations tested.
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Affiliation(s)
- D Airaudi
- Dipartimento di Biologia Vegetale, Università di Torino, Italy
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