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Stefaniu C, Wölk C, Latza VM, Chumakov A, Brezesinski G, Schneck E. Cross-linking reactions in Langmuir monolayers of specially designed aminolipids - a toolbox for the customized production of amphiphilic nanosheets. NANOSCALE ADVANCES 2023; 5:4589-4597. [PMID: 37638167 PMCID: PMC10448339 DOI: 10.1039/d3na00244f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Accepted: 08/09/2023] [Indexed: 08/29/2023]
Abstract
Synthetic amino lipids, already known as highly efficient gene therapy tool, are used in a novel way to create cross-linked stable one-molecule-thin films envisioned for future (bio)-materials applications. The films are prepared as Langmuir monolayers at the air/water interface and cross-linked 'in situ' via dynamic imine chemistry. The cross-linking process and the film characteristics are monitored by various surface-sensitive techniques such as grazing incidence X-ray diffraction, X-ray reflectivity, and infrared reflection-absorption spectroscopy. After transfer onto carbon grids, the cross-linked films are investigated by transmission and scanning electron microscopy. The obtained micrographs display mechanically self-supported nanosheets with area dimensions over several micrometers and, thus, an undeniable visual proof of successful cross-linking. The cross-linking process at the air/water interface allows to obtain Janus-faced sheets with a hydrophobic side characterized by aliphatic alkyl chains and a hydrophilic side characterized by nucleophilic groups like amines, hydroxyl groups and imine.
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Affiliation(s)
- Cristina Stefaniu
- Departments of Biomaterials and Biomolecular Systems, Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
| | - Christian Wölk
- Pharmaceutical Technology, Faculty of Medicine, University of Leipzig Eilenburger Str. 15a 04317 Leipzig Germany
| | - Victoria M Latza
- Departments of Biomaterials and Biomolecular Systems, Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
| | - Andrei Chumakov
- European Synchrotron Radiation Facility 71, avenue des Martyrs, CS 40220 38043 Grenoble Cedex 9 France
| | - Gerald Brezesinski
- Departments of Biomaterials and Biomolecular Systems, Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
- Department of Physics, TU Darmstadt Hochschulstr. 8 64289 Darmstadt Germany
| | - Emanuel Schneck
- Departments of Biomaterials and Biomolecular Systems, Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
- Department of Physics, TU Darmstadt Hochschulstr. 8 64289 Darmstadt Germany
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2
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Husteden C, Brito Barrera YA, Tegtmeyer S, Borges J, Giselbrecht J, Menzel M, Langner A, Mano JF, Schmelzer CEH, Wölk C, Groth T. Lipoplex-Functionalized Thin-Film Surface Coating Based on Extracellular Matrix Components as Local Gene Delivery System to Control Osteogenic Stem Cell Differentiation. Adv Healthc Mater 2023; 12:e2201978. [PMID: 36377486 DOI: 10.1002/adhm.202201978] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 10/25/2022] [Indexed: 11/16/2022]
Abstract
A gene-activated surface coating is presented as a strategy to design smart biomaterials for bone tissue engineering. The thin-film coating is based on polyelectrolyte multilayers composed of collagen I and chondroitin sulfate, two main biopolymers of the bone extracellular matrix, which are fabricated by layer-by-layer assembly. For further functionalization, DNA/lipid-nanoparticles (lipoplexes) are incorporated into the multilayers. The polyelectrolyte multilayer fabrication and lipoplex deposition are analyzed by surface sensitive analytical methods that demonstrate successful thin-film formation, fibrillar structuring of collagen, and homogenous embedding of lipoplexes. Culture of mesenchymal stem cells on the lipoplex functionalized multilayer results in excellent attachment and growth of them, and also, their ability to take up cargo like fluorescence-labelled DNA from lipoplexes. The functionalization of the multilayer with lipoplexes encapsulating DNA encoding for transient expression of bone morphogenetic protein 2 induces osteogenic differentiation of mesenchymal stem cells, which is shown by mRNA quantification for osteogenic genes and histochemical staining. In summary, the novel gene-functionalized and extracellular matrix mimicking multilayer composed of collagen I, chondroitin sulfate, and lipoplexes, represents a smart surface functionalization that holds great promise for tissue engineering constructs and implant coatings to promote regeneration of bone and other tissues.
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Affiliation(s)
- Catharina Husteden
- Institute of Pharmacy, Department of Medicinal Chemistry, Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120, Halle (Saale), Germany
| | - Yazmin A Brito Barrera
- Institute of Pharmacy, Department of Biomedical Materials, Martin Luther University Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120, Halle (Saale), Germany
| | - Sophia Tegtmeyer
- Institute of Pharmacy, Department of Medicinal Chemistry, Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120, Halle (Saale), Germany
| | - João Borges
- Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, Aveiro, 3810-193, Portugal
| | - Julia Giselbrecht
- Institute of Pharmacy, Department of Medicinal Chemistry, Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120, Halle (Saale), Germany
| | - Matthias Menzel
- Department of Biological and Macromolecular Materials, Fraunhofer Institute for Microstructure of Materials and Systems (IMWS), Walter-Hülse-Str. 1, 06120, Halle (Saale), Germany
| | - Andreas Langner
- Institute of Pharmacy, Department of Medicinal Chemistry, Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120, Halle (Saale), Germany
| | - João F Mano
- Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, Aveiro, 3810-193, Portugal
| | - Christian E H Schmelzer
- Department of Biological and Macromolecular Materials, Fraunhofer Institute for Microstructure of Materials and Systems (IMWS), Walter-Hülse-Str. 1, 06120, Halle (Saale), Germany
| | - Christian Wölk
- Institute of Pharmacy, Pharmaceutical Technology, Faculty of Medicine, Leipzig University, 04317, Leipzig, Germany
| | - Thomas Groth
- Institute of Pharmacy, Department of Biomedical Materials, Martin Luther University Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120, Halle (Saale), Germany.,Interdisciplinary Center of Materials Science, Martin Luther University Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120, Halle (Saale), Germany
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3
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New MraY AA Inhibitors with an Aminoribosyl Uridine Structure and an Oxadiazole. Antibiotics (Basel) 2022; 11:antibiotics11091189. [PMID: 36139968 PMCID: PMC9495235 DOI: 10.3390/antibiotics11091189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 08/22/2022] [Accepted: 08/30/2022] [Indexed: 11/16/2022] Open
Abstract
New inhibitors of the bacterial transferase MraY from Aquifex aeolicus (MraYAA), based on the aminoribosyl uridine central core of known natural MraY inhibitors, have been designed to generate interaction of their oxadiazole linker with the key amino acids (H324 or H325) of the enzyme active site, as observed for the highly potent inhibitors carbacaprazamycin, muraymycin D2 and tunicamycin. A panel of ten compounds was synthetized notably thanks to a robust microwave-activated one-step sequence for the synthesis of the oxadiazole ring that involved the O-acylation of an amidoxime and subsequent cyclization. The synthetized compounds, with various hydrophobic substituents on the oxadiazole ring, were tested against the MraYAA transferase activity. Although with poor antibacterial activity, nine out of the ten compounds revealed the inhibition of the MraYAA activity in the range of 0.8 µM to 27.5 µM.
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Giselbrecht J, Pinnapireddy SR, Alioglu F, Sami H, Sedding D, Erdmann F, Janich C, Schulz-Siegmund M, Ogris M, Bakowsky U, Langner A, Bussmann J, Wölk C. Investigating 3R In Vivo Approaches for Bio-Distribution and Efficacy Evaluation of Nucleic Acid Nanocarriers: Studies on Peptide-Mimicking Ionizable Lipid. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2107768. [PMID: 35355412 DOI: 10.1002/smll.202107768] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/10/2022] [Indexed: 06/14/2023]
Abstract
Formulations based on ionizable amino-lipids have been put into focus as nucleic acid delivery systems. Recently, the in vitro efficacy of the lipid formulation OH4:DOPE has been explored. However, in vitro performance of nanomedicines cannot correctly predict in vivo efficacy, thereby considerably limiting pre-clinical translation. This is further exacerbated by limited access to mammalian models. The present work proposes to close this gap by investigating in vivo nucleic acid delivery within simpler models, but which still offers physiologically complex environments and also adheres to the 3R guidelines (replace/reduce/refine) to improve animal experiments. The efficacy of OH4:DOPE as a delivery system for nucleic acids is demonstrated using in vivo approaches. It is shown that the formulation is able to transfect complex tissues using the chicken chorioallantoic membrane model. The efficacy of DNA and mRNA lipoplexes is tested extensively in the zebra fish (Danio rerio) embryo which allows the screening of biodistribution and transfection efficiency. Effective transfection of blood vessel endothelial cells is seen, especially in the endocardium. Both model systems allow an efficacy screening according to the 3R guidelines bypassing the in vitro-in vivo gap. Pilot studies in mice are performed to correlate the efficacy of in vivo transfection.
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Affiliation(s)
- Julia Giselbrecht
- Department of Medicinal Chemistry/Department of Pharmacology, Institute of Pharmacy Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120, Halle (Saale), Germany
| | - Shashank Reddy Pinnapireddy
- Department of Pharmaceutics and Biopharmaceutics, University of Marburg, Robert-Koch-Str. 4, 35037, Marburg, Germany
- CSL Behring Innovation GmbH, Emil-von-Behring-Str. 76, 35041, Marburg, Germany
| | - Fatih Alioglu
- Faculty of Life Sciences, Department of Pharmaceutical Sciences, Laboratory of MacroMolecular Cancer Therapeutics (MMCT), University of Vienna, Althanstrasse 14, Vienna, 1090, Austria
| | - Haider Sami
- Faculty of Life Sciences, Department of Pharmaceutical Sciences, Laboratory of MacroMolecular Cancer Therapeutics (MMCT), University of Vienna, Althanstrasse 14, Vienna, 1090, Austria
| | - Daniel Sedding
- Internal Medicine III, Medical Faculty of Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06120, Halle (Saale), Germany
| | - Frank Erdmann
- Department of Medicinal Chemistry/Department of Pharmacology, Institute of Pharmacy Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120, Halle (Saale), Germany
| | - Christopher Janich
- Department of Medicinal Chemistry/Department of Pharmacology, Institute of Pharmacy Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120, Halle (Saale), Germany
| | - Michaela Schulz-Siegmund
- Pharmaceutical Technology, Medical Faculty, University Leipzig, Eilenburger Straße 15a, 04317, Leipzig, Germany
| | - Manfred Ogris
- Faculty of Life Sciences, Department of Pharmaceutical Sciences, Laboratory of MacroMolecular Cancer Therapeutics (MMCT), University of Vienna, Althanstrasse 14, Vienna, 1090, Austria
| | - Udo Bakowsky
- Department of Pharmaceutics and Biopharmaceutics, University of Marburg, Robert-Koch-Str. 4, 35037, Marburg, Germany
| | - Andreas Langner
- Department of Medicinal Chemistry/Department of Pharmacology, Institute of Pharmacy Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120, Halle (Saale), Germany
| | - Jeroen Bussmann
- Division of BioTherapeutics, Leiden Academic Center for Drug Research, Leiden University, Einsteinweg 55, Leiden, 2333 CC, The Netherlands
| | - Christian Wölk
- Pharmaceutical Technology, Medical Faculty, University Leipzig, Eilenburger Straße 15a, 04317, Leipzig, Germany
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Stefaniu C, Wölk C, Brezesinski G, Schneck E. Relationship between structure and molecular interactions in monolayers of specially designed aminolipids. NANOSCALE ADVANCES 2019; 1:3529-3536. [PMID: 36133531 PMCID: PMC9418614 DOI: 10.1039/c9na00355j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 07/23/2019] [Indexed: 05/05/2023]
Abstract
Artificial cationic lipids are already recognized as highly efficient gene therapy tools. Here, we focus on another potential use of aminolipids, in their electrically-uncharged state, for the formation of covalently cross-linked, one-molecule-thin films at interfaces. Such films are envisioned for future (bio-)materials applications. To this end, Langmuir monolayers of structurally different aminolipids are comprehensively characterized with the help of highly sensitive surface characterization techniques. Pressure-area isotherms, Brewster angle microscopy, grazing-incidence X-ray diffraction and infrared reflection-absorption spectrometry experiments provide a detailed, comparative molecular picture of the formed monolayers. This physico-chemical study highlights the relationship between chemical structures and intermolecular interactions, which can serve as a basis for the rational design of cross-linked thin films with precisely controlled properties.
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Affiliation(s)
- Cristina Stefaniu
- Departments of Biomaterials and Biomolecular Systems, Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
| | - Christian Wölk
- Institute of Pharmacy, Research Group Biochemical Pharmacy, Martin-Luther-University Wolfgang-Langenbeck-Strasse 4 06120 Halle (Saale) Germany
| | - Gerald Brezesinski
- Departments of Biomaterials and Biomolecular Systems, Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
| | - Emanuel Schneck
- Departments of Biomaterials and Biomolecular Systems, Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
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6
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Tassler S, Pawlowska D, Janich C, Giselbrecht J, Drescher S, Langner A, Wölk C, Brezesinski G. Lysine-based amino-functionalized lipids for gene transfection: 3D phase behaviour and transfection performance. Phys Chem Chem Phys 2019; 20:17393-17405. [PMID: 29911233 DOI: 10.1039/c8cp01922c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Based on previous work, the influence of the chain composition on the physical-chemical properties of five new transfection lipids (TH10, TT10, OH10, OT10 and OO10) containing the same lysine-based head group has been investigated in aqueous dispersions. For this purpose, the chain composition has been gradually varied from saturated tetradecyl (T, C14:0) and hexadecyl (H, C16:0) chains to longer but unsaturated oleyl (O, C18:1) chains with double bonds in the cis configuration. In this work, the lipid dispersions have been investigated in the absence and presence of the helper lipid DOPE and calf thymus DNA by small-angle and wide-angle X-ray scattering (SAXS/WAXS) supplemented by differential scanning calorimetry (DSC), attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR) and Fourier-transform Raman spectroscopy (FTRS). Lamellar and inverted hexagonal mesophases have been observed in single-component systems. In the binary mixtures, the aggregation behaviour changes with an increasing amount of DOPE from lamellar to cubic. The lipid mixtures with DNA show a panoply of mesophases. Interestingly, TT10 and OT10 form cubic lipoplexes, whereas OO10 complexes the DNA sandwich-like between lipid bilayers in a lamellar lipoplex. Surprisingly, the latter is the most effective lipoplex.
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Affiliation(s)
- Stephanie Tassler
- Max Planck Institute of Colloids and Interfaces, Science Park Potsdam-Golm, Am Mühlenberg 1, 14476 Potsdam, Germany.
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7
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Tassler S, Dobner B, Lampp L, Ziółkowski R, Malinowska E, Wölk C, Brezesinski G. DNA Delivery Systems Based on Peptide-Mimicking Cationic Lipids-The Effect of the Co-Lipid on the Structure and DNA Binding Capacity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:4613-4625. [PMID: 30840475 PMCID: PMC6727600 DOI: 10.1021/acs.langmuir.8b04139] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 02/27/2019] [Indexed: 06/09/2023]
Abstract
In continuation of previous work, we present a new promising DNA carrier, OO4, a highly effective peptide-mimicking lysine-based cationic lipid. The structural characteristics of the polynucleotide carrier system OO4 mixed with the commonly used co-lipid DOPE and the saturated phospholipid DPPE have been studied in two-dimensional and three-dimensional model systems to understand their influence on the physical-chemical properties. The phase behavior of pure OO4 and its mixtures with DOPE and DPPE was studied at the air-water interface using a Langmuir film balance combined with infrared reflection-absorption spectroscopy. In bulk, the self-assembling structures in the presence and absence of DNA were determined by small-angle and wide-angle X-ray scattering. The amount of adsorbed DNA to cationic lipid bilayers was measured using a quartz crystal microbalance. The choice of the co-lipid has an enormous influence on the structure and capability of binding DNA. DOPE promotes the formation of nonlamellar lipoplexes (cubic and hexagonal structures), whereas DPPE promotes the formation of lamellar lipoplexes. The correlation of the observed structures with the transfection efficiency and serum stability indicates that OO4/DOPE 1:3 lipoplexes with a DNA-containing cubic phase encapsulated in multilamellar structures seem to be most promising.
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Affiliation(s)
- Stephanie Tassler
- Max
Planck Institute of Colloids and Interfaces, Science Park Potsdam-Golm, Am Mühlenberg
1, 14476 Potsdam, Germany
| | - Bodo Dobner
- Institute
of Pharmacy, Martin-Luther-University (MLU)
Halle-Wittenberg, Wolfgang-Langenbeck-Straße
4, 06120 Halle (Saale), Germany
| | - Lisa Lampp
- Institute
of Pharmacy, Martin-Luther-University (MLU)
Halle-Wittenberg, Wolfgang-Langenbeck-Straße
4, 06120 Halle (Saale), Germany
| | - Robert Ziółkowski
- Faculty
of Chemistry, Department of Microbioanalytics, The Chair of Medical
Biotechnology, Warsaw University of Technology, ul. Noakowskiego 3, 00-664 Warszawa, Poland
| | - Elżbieta Malinowska
- Faculty
of Chemistry, Department of Microbioanalytics, The Chair of Medical
Biotechnology, Warsaw University of Technology, ul. Noakowskiego 3, 00-664 Warszawa, Poland
| | - Christian Wölk
- Institute
of Pharmacy, Martin-Luther-University (MLU)
Halle-Wittenberg, Wolfgang-Langenbeck-Straße
4, 06120 Halle (Saale), Germany
| | - Gerald Brezesinski
- Max
Planck Institute of Colloids and Interfaces, Science Park Potsdam-Golm, Am Mühlenberg
1, 14476 Potsdam, Germany
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8
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Tassler S, Pawlowska D, Janich C, Dobner B, Wölk C, Brezesinski G. Lysine-based amino-functionalized lipids for gene transfection: the influence of the chain composition on 2D properties. Phys Chem Chem Phys 2018; 20:6936-6944. [PMID: 29464262 DOI: 10.1039/c8cp00047f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The influence of the chain composition on the physical-chemical properties will be discussed for five transfection lipids containing the same lysine-based head group. For this purpose, the chain composition will be gradually varied from saturated tetradecyl (C14:0) and hexadecyl (C16:0) chains to longer but unsaturated oleyl (C18:1) chains with double bonds in the cis configuration. In this work, we investigated the lipids as Langmuir monolayers at the air-water-interface in the absence and presence of calf thymus DNA applying different techniques such as infrared reflection absorption spectroscopy (IRRAS) and grazing incidence X-ray diffraction (GIXD). The replacement of saturated tetradecyl (C14:0) and hexadecyl (C16:0) chains by unsaturated oleyl (C18:1) chains increases the fluidity of the lipid monolayer: TH10 < TT10 < OH10 < OT10 < OO10 resulting in a smaller packing density. TH10 forms the stiffest and OO10 the most fluid monolayer in this structure-property study. OO10 has a higher protonation degree compared to the saturated lipids TT10 and TH10 as well as to the hybrids OT10 and OH10 because of a better accessibility of the amine groups. Depending on the bulk pH, different scenarios of DNA coupling to the lipid monolayers have been proposed.
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Affiliation(s)
- Stephanie Tassler
- Max Planck Institute of Colloids and Interfaces, Science Park Potsdam-Golm, Am Mühlenberg 1, 14476 Potsdam, Germany.
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Giselbrecht J, Janich C, Pinnapireddy SR, Hause G, Bakowsky U, Wölk C, Langner A. Overcoming the polycation dilemma - Explorative studies to characterise the efficiency and biocompatibility of newly designed lipofection reagents. Int J Pharm 2018; 541:81-92. [PMID: 29462683 DOI: 10.1016/j.ijpharm.2018.02.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 02/05/2018] [Accepted: 02/16/2018] [Indexed: 01/05/2023]
Abstract
In this explorative study of the novel cationic lipid OO4 in two different formulations the complex formation with DNA, the biopharmaceutical stability of the lipid/DNA complexes in physiological media, and the transfection efficiency were analysed. We investigated liposomes composed of two binary mixtures of OO4 with either DOPE or DPPE as co-lipids in the molar ratio of 1:3. These formulations were compared with regard to their ability to bind the DNA using gel retardation electrophoresis, ethidium bromide exclusion and zeta potential measurements. Colloidal stability of the lipoplexes in foetal bovine serum (FBS) and the protective effect against degradation by endonucleases were studied. Furthermore, the influence of different salt concentrations on the complex formation with DNA was examined. The DOPE mixture was markedly superior compared to the DPPE mixture. Finally, haemocompatibility studies and gene silencing experiments were performed on OO4:DOPE 1:3 (n:n). The experiments demonstrate that the lipoplex formulation OO4:DOPE 1:3 (n:n) at N/P 4 is a promising candidate for systemic application because of the high colloidal stability in serum without PEGylated lipids, high transfection efficiency, superior resistance against nucleases, reproducible complexation independent of ionic effects, and haemocompatibility.
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Affiliation(s)
- Julia Giselbrecht
- Martin Luther University Halle-Wittenberg, Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Christopher Janich
- Martin Luther University Halle-Wittenberg, Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Shashank Reddy Pinnapireddy
- Department of Pharmaceutics and Biopharmaceutics, University of Marburg, Robert-Koch-Strasse 4, 35037 Marburg, Germany
| | - Gerd Hause
- Martin Luther University Halle-Wittenberg, Biocenter, Weinbergweg 22, 06120 Halle, Germany
| | - Udo Bakowsky
- Department of Pharmaceutics and Biopharmaceutics, University of Marburg, Robert-Koch-Strasse 4, 35037 Marburg, Germany
| | - Christian Wölk
- Martin Luther University Halle-Wittenberg, Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany.
| | - Andreas Langner
- Martin Luther University Halle-Wittenberg, Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
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10
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Tassler S, Wölk C, Janich C, Dobner B, Brezesinski G. Lysine-based amino-functionalized lipids for gene transfection: the protonation state in monolayers at the air-liquid interface. Phys Chem Chem Phys 2018; 19:20271-20280. [PMID: 28726909 DOI: 10.1039/c7cp03107f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Cationic lipids are considered as non-viral carriers for genetic material used in gene therapy. They have no carcinogenic potential and cause low immune response compared to existing viral systems. The protonation degree of these cationic lipids is a crucial parameter for the binding behavior of polynucleotides (e.g., DNA). Newly synthesized peptide-mimic lysine-based amino-functionalized lipids have been investigated in 2D models as monolayers at the air-liquid interface. Standard surface pressure - area isotherms have been measured to prove the layer stability. Total reflection X-ray fluorescence (TRXF) has been used as a surface sensitive analytical method to estimate the amount of counterions at the head groups. Using a standard sample as a reference, the protonation degree of these cationic lipids can be quantified on buffers with different pH values. It is found that the protonation degree depends linearly on the packing density of the lipid monolayer.
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Affiliation(s)
- Stephanie Tassler
- Max Planck Institute of Colloids and Interfaces, Science Park Potsdam-Golm, Am Mühlenberg 1, 14476 Potsdam, Germany.
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11
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Janich C, Hädicke A, Bakowsky U, Brezesinski G, Wölk C. Interaction of DNA with Cationic Lipid Mixtures-Investigation at Langmuir Lipid Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:10172-10183. [PMID: 28873311 DOI: 10.1021/acs.langmuir.7b02014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Four different binary lipid mixtures composed of a cationic lipid and the zwitterionic colipids DOPE or DPPC, which show different DNA transfer activities in cell culture models, were investigated at the soft air/water interface to identify transfection efficiency determining characteristics. Langmuir films are useful models to investigate the interaction between DNA and lipid mixtures in a two-dimensional model system by using different surface sensitive techniques, namely, epifluorescence microscopy and infrared reflection-absorption spectroscopy. Especially, the effect of adsorbed DNA on the properties of the lipid mixtures has been examined. Distinct differences between the lipid composites were found which are caused by the different colipids of the mixtures. DOPE containing lipid mixtures form fluid monolayers with a uniform distribution of the fluorescent probe in the presence and absence of DNA at physiologically relevant surface pressures. Only at high nonphysiological pressures, the lipid monolayer collapses and phase separation was observed if DNA was present in the subphase. In contrast, DPPC containing lipid mixtures show domains in the liquid condensed phase state in the presence and absence of DNA in the subphase. The adsorption of DNA at the positively charged mixed lipid monolayer induces phase separation which is expressed in the morphology and the point of appearance of these domains.
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Affiliation(s)
- Christopher Janich
- Martin Luther University Halle-Wittenberg , Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - André Hädicke
- CUO-Recherche, Hôpital du Saint-Sacrement, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de médecine, and Regroupement stratégique PROTEO, Université Laval , Québec, Québec, Canada
| | - Udo Bakowsky
- Department of Pharmaceutics and Biopharmaceutics, University Marburg , Ketzerbach 63, 35037 Marburg, Germany
| | - Gerald Brezesinski
- Max-Planck Institute of Colloids and Interfaces, Science Park Potsdam-Golm , Am Muehlenberg 1, 14476 Potsdam, Germany
| | - Christian Wölk
- Martin Luther University Halle-Wittenberg , Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
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Wölk C, Janich C, Bakowsky U, Langner A, Brezesinski G. Malonic acid based cationic lipids - The way to highly efficient DNA-carriers. Adv Colloid Interface Sci 2017; 248:20-34. [PMID: 28842122 DOI: 10.1016/j.cis.2017.08.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 08/10/2017] [Accepted: 08/10/2017] [Indexed: 01/21/2023]
Abstract
Cationic lipids play an important role as non-viral nucleic acid carriers in gene therapy since 3 decades. This review will introduce malonic acid derived cationic lipids as nucleic acid carriers which appeared in the literature dealing with lipofection 10years ago. The family of amino-functionalized branched fatty acid amides will be presented as well as different generations of malonic acid diamides. Both groups of cationic lipids yield lipid mixtures with highly efficient nucleic acid transfer activities in in-vitro cell culture models. The DNA transfer screening of lipid libraries with directed structural variations in the lipophilic as well as in the hydrophilic part of the amphiphiles yields structure/activity relationships. Furthermore, the detailed characterizations of selected lipid composites at the air/water interface and in bulk systems are summarized with regard to transfection determining physical-chemical properties. The findings are also discussed in comparison to results obtained with other families of cationic lipids.
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Affiliation(s)
- Christian Wölk
- Martin Luther University Halle-Wittenberg, Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle, Saale, Germany.
| | - Christopher Janich
- Martin Luther University Halle-Wittenberg, Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle, Saale, Germany
| | - Udo Bakowsky
- Department of Pharmaceutics and Biopharmaceutics, University Marburg, Robert-Koch-Straße 4, 35037 Marburg, Germany
| | - Andreas Langner
- Martin Luther University Halle-Wittenberg, Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle, Saale, Germany
| | - Gerald Brezesinski
- Max Planck Institute of Colloids and Interfaces, Science Park Potsdam-Golm, Am Mühlenberg 1, 14476 Potsdam, Germany.
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Fast therapeutic DNA internalization – A high potential transfection system based on a peptide mimicking cationic lipid. Eur J Pharm Biopharm 2017; 118:38-47. [DOI: 10.1016/j.ejpb.2016.12.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 11/21/2016] [Accepted: 12/14/2016] [Indexed: 02/08/2023]
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Janich C, Taßler S, Meister A, Hause G, Schäfer J, Bakowsky U, Brezesinski G, Wölk C. Structures of malonic acid diamide/phospholipid composites and their lipoplexes. SOFT MATTER 2016; 12:5854-66. [PMID: 27328379 DOI: 10.1039/c6sm00807k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
As a continuation of previous work, the self-assembly process of cationic lipid formulations in the presence and absence of DNA was investigated with respect to binary lipid mixtures suitable as polynucleotide carrier systems. The lipid blends consist of one malonic-acid-based cationic lipid with a varying alkyl chain pattern, either N-{6-amino-1-[N-(9Z)-octadec-9-enylamino]-1-oxohexan-(2S)-2-yl}-N'-{2-[N,N-bis(2-aminoethyl)amino]ethyl}-2-hexadecylpropandiamide () or N-[6-amino-1-oxo-1-(N-tetradecylamino)hexan-(2S)-2-yl]-N'-{2-[N,N-bis(2-aminoethyl)amino]ethyl}-2-hexadecylpropandiamide (), and one neutral co-lipid, either 1,2-di-[(9Z)-octadec-9-enoyl]-sn-glycero-3-phosphocholine (DOPE) or 1,2-di-(hexadecanoyl)-sn-glycero-3-phosphocholine (DPPC). Although the cationic lipids exhibit only slight differences in their structure, the DNA transfer efficiency varies drastically. Therefore, self-assembly was studied in 3D systems by small- and wide-angle X-ray scattering (SAXS and WAXS) and transmission electron microscopy (TEM) as well as in 2D systems by infrared reflection-absorption spectroscopy (IRRAS) on Langmuir films. The investigated lipid mixtures show quite different self-assembly in the absence of DNA, with varying structures from vesicles (/DOPE; /DOPE) and tubes (/DOPE) to discoid structures (/DPPC; /DPPC). Twisted ribbons and sheets, which were stabilized due to hydrogen-bond networks, were found in all investigated lipid mixtures in the absence of DNA. The addition of DNA leads to the formation of lamellar lipoplexes for all the investigated lipid compositions. The lipoplexes differ in crucial parameters, such as the lamellar repeat distance and the spacing between the DNA strands, indicating differences in the binding strength between DNA and the lipid composition. The formation of associates with an ideal charge density might emerge as a key parameter for efficient DNA transfer. Furthermore, the structures observed for the different lipid compositions in the absence of DNA prepare the way for other applications besides gene therapy.
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Affiliation(s)
- Christopher Janich
- Martin Luther University Halle-Wittenberg, Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle, Saale, Germany. and Philipps University Marburg, Department of Pharmaceutical Technology and Biopharmacy, Ketzerbach 63, 35037 Marburg, Germany
| | - Stephanie Taßler
- Max Planck Institute of Colloids and Interfaces, Science Park Potsdam-Golm, Am Mühlenberg 1, 14476 Potsdam, Germany
| | - Annette Meister
- Martin Luther University Halle-Wittenberg, Institute of Chemistry, Physical Chemistry and Institute of Biochemistry and Biotechnology, von-Danckelmann-Platz 4, 06120 Halle, Saale, Germany
| | - Gerd Hause
- Martin Luther University Halle-Wittenberg, Biocenter, Weinbergweg 22, 06120 Halle, Saale, Germany
| | - Jens Schäfer
- Philipps University Marburg, Department of Pharmaceutical Technology and Biopharmacy, Ketzerbach 63, 35037 Marburg, Germany
| | - Udo Bakowsky
- Philipps University Marburg, Department of Pharmaceutical Technology and Biopharmacy, Ketzerbach 63, 35037 Marburg, Germany
| | - Gerald Brezesinski
- Max Planck Institute of Colloids and Interfaces, Science Park Potsdam-Golm, Am Mühlenberg 1, 14476 Potsdam, Germany
| | - Christian Wölk
- Martin Luther University Halle-Wittenberg, Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle, Saale, Germany.
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Composites of malonic acid diamides and phospholipids — Impact of lipoplex stability on transfection efficiency. J Control Release 2015; 220:295-307. [DOI: 10.1016/j.jconrel.2015.10.045] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 10/22/2015] [Accepted: 10/24/2015] [Indexed: 01/09/2023]
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16
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The Directional Observation of Highly Dynamic Membrane Tubule Formation Induced by Engulfed Liposomes. Sci Rep 2015; 5:16559. [PMID: 26548331 PMCID: PMC4637876 DOI: 10.1038/srep16559] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 10/01/2015] [Indexed: 11/09/2022] Open
Abstract
Highly dynamic tubular structures in cells are responsible for exchanges between organelles. Compared with bacterial invasion, the most affordable and least toxic lipids were found in this study to be gentle and safe exogenous stimuli for the triggering of membrane tubules. A specific lipid system was internalized by NIH3T3 cells. Following cellular uptake, the constructed liposomes traveled towards the nucleus in aggregations and were gradually distributed into moving vesicles and tubules in the cytosol. The triggered tubules proceeded, retreated or fluctuated along the cytoskeleton and were highly dynamic, moving quickly (up to several microns per second), and breaking and fusing frequently. These elongated tubules could also fuse with one another, giving rise to polygonal membrane networks. These lipid systems, with the novel property of accelerating intracellular transport, provide a new paradigm for investigating cellular dynamics.
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Wölk C, Janich C, Meister A, Drescher S, Langner A, Brezesinski G, Bakowsky U. Investigation of Binary Lipid Mixtures of a Three-Chain Cationic Lipid with Phospholipids Suitable for Gene Delivery. Bioconjug Chem 2015; 26:2461-73. [PMID: 26471337 DOI: 10.1021/acs.bioconjchem.5b00505] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In the present work, we characterize binary lipid mixtures consisting of a three-chain amino-functionalized cationic lipid (DiTT4) with different phospholipids, namely, 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE), 1,2-dimyristoyl-sn-glycero-3-phosphoethanolamine (DMPE), or 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC). The mixing behavior was investigated by differential scanning calorimetry (DSC). Additionally, aqueous dispersions of the binary mixtures were characterized by means of dynamic light scattering (DLS), laser Doppler electrophoresis, and transmission electron microscopy (TEM) to get further information about particle size, charge, and shape. The complex formation between different binary lipid mixtures and plasmid DNA (pDNA) was investigated by zeta-(ζ)-potential (laser Doppler electrophoresis) and DLS measurements, and the lipid/DNA complexes (lipoplexes) were screened for efficient DNA transfer (transfection) in cell culture. Finally, efficient lipid compositions were investigated with respect to serum stability. This work provides a detailed characterization of the cationic lipid mixtures as foundation for further research. Efficient gene transfer in the presence of serum was demonstrated for selected lipoplexes showing their capability to be used as high-potency gene delivery vehicles.
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Affiliation(s)
- Christian Wölk
- Philipps University Marburg , Department of Pharmaceutical Technology and Biopharmaceutics, Ketzerbach 63, 35037 Marburg, Germany.,Martin Luther University (MLU) Halle-Wittenberg , Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Christopher Janich
- Martin Luther University (MLU) Halle-Wittenberg , Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Annette Meister
- MLU Halle-Wittenberg , Center for Structure and Dynamics of Proteins (MZP), Weinbergweg 22, 06120 Halle (Saale), Germany
| | - Simon Drescher
- Martin Luther University (MLU) Halle-Wittenberg , Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Andreas Langner
- Martin Luther University (MLU) Halle-Wittenberg , Institute of Pharmacy, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Gerald Brezesinski
- Max Planck Institute of Colloids and Interfaces , Science Park Potsdam-Golm, Am Mühlenberg 1, 14476 Potsdam, Germany
| | - Udo Bakowsky
- Philipps University Marburg , Department of Pharmaceutical Technology and Biopharmaceutics, Ketzerbach 63, 35037 Marburg, Germany
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Erdmann N, Wölk C, Schulze I, Janich C, Folz M, Drescher S, Dittrich M, Meister A, Vogel J, Groth T, Dobner B, Langner A. Tris(2-aminoethyl)amine-based α-branched fatty acid amides - Synthesis of lipids and comparative study of transfection efficiency of their lipid formulations. Eur J Pharm Biopharm 2015; 96:349-62. [PMID: 26325061 DOI: 10.1016/j.ejpb.2015.08.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 08/21/2015] [Accepted: 08/24/2015] [Indexed: 12/13/2022]
Abstract
The synthesis of a new class of cationic lipids, tris(2-aminoethyl)amine-based α-branched fatty acid amides, is described resulting in a series of lipids with specific variations in the lipophilic as well as the hydrophilic part of the lipids. In-vitro structure/transfection relationships were established by application of complexes of these lipids with plasmid DNA (pDNA) to different cell lines. The α-branched fatty acid amide bearing two tetradecyl chains and two lysine molecules (T14diLys) in mixture with the co-lipid 1,2-di-[(9Z)-octadec-9-enoyl]-sn-glycero-3-phosphoethanolamine (DOPE) (1/2, n/n) exhibits effective pDNA transfer in three different cell lines, namely Hep-G2, A549, and COS-7. The presence of 10% serum during lipoplex incubation of the cells did not affect the transfection efficiency. Based on that, detailed investigations of the complexation of pDNA with the lipid formulation T14diLys/DOPE 1/2 (n/n) were carried out with respect to particle size and charge using dynamic light scattering (DLS), ζ-potential measurements, and transmission electron microscopy (TEM). Additionally, the lipoplex uptake was investigated by confocal laser scanning microscopy (CLSM). Overall, lipoplexes prepared from T14diLys/DOPE 1/2 (n/n) offer large potential as lipid-based polynucleotide carriers and further justify advanced examinations.
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Affiliation(s)
- Nicole Erdmann
- Institute of Pharmacy, Biochemical Pharmacy, Martin Luther University (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle (Saale), Germany
| | - Christian Wölk
- Institute of Pharmacy, Biochemical Pharmacy, Martin Luther University (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle (Saale), Germany; Department of Pharmaceutical Technology and Biopharmaceutics, Philipps University Marburg, Ketzerbach 63, 35037 Marburg, Germany.
| | - Ingo Schulze
- Institute of Pharmacy, Biochemical Pharmacy, Martin Luther University (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle (Saale), Germany
| | - Christopher Janich
- Institute of Pharmacy, Biochemical Pharmacy, Martin Luther University (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle (Saale), Germany
| | - Manuela Folz
- Institute of Pharmacy, Biochemical Pharmacy, Martin Luther University (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle (Saale), Germany
| | - Simon Drescher
- Centre for Innovation Competence - HALOmem, MLU Halle-Wittenberg, Kurt-Mothes-Str. 3, 06120 Halle (Saale), Germany
| | - Matthias Dittrich
- Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
| | - Annette Meister
- Martin Luther University Halle-Wittenberg, Center for Structure and Dynamics of Proteins (MZP), Weinbergweg 22, 06120 Halle (Saale), Germany
| | - Jürgen Vogel
- Institute of Pharmacy, Biomedical Materials Group, MLU Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120 Halle (Saale), Germany
| | - Thomas Groth
- Institute of Pharmacy, Biomedical Materials Group, MLU Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120 Halle (Saale), Germany
| | - Bodo Dobner
- Institute of Pharmacy, Biochemical Pharmacy, Martin Luther University (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle (Saale), Germany.
| | - Andreas Langner
- Institute of Pharmacy, Biochemical Pharmacy, Martin Luther University (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, 06120 Halle (Saale), Germany
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Wölk C, Janich C, Pawlowska D, Drescher S, Meister A, Hause G, Dobner B, Langner A, Brezesinski G. Lamellar versus Micellar Structures-Aggregation Behavior of a Three-Chain Cationic Lipid Designed for Nonviral Polynucleotide Transfer. Chemphyschem 2015; 16:2115-26. [DOI: 10.1002/cphc.201500188] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Indexed: 11/06/2022]
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Bak A, Leung D, Barrett SE, Forster S, Minnihan EC, Leithead AW, Cunningham J, Toussaint N, Crocker LS. Physicochemical and formulation developability assessment for therapeutic peptide delivery--a primer. AAPS JOURNAL 2014; 17:144-55. [PMID: 25398427 DOI: 10.1208/s12248-014-9688-2] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Accepted: 10/09/2014] [Indexed: 12/12/2022]
Abstract
Peptides are an important class of endogenous ligands that regulate key biological cascades. As such, peptides represent a promising therapeutic class with the potential to alleviate many severe disease states. Despite their therapeutic potential, peptides frequently pose drug delivery challenges to scientists. This review introduces the physicochemical, biophysical, biopharmaceutical, and formulation developability aspects of peptides pertinent to the drug discovery-to-development interface. It introduces the relevance of these properties with respect to the delivery modalities available for peptide pharmaceuticals, with the parenteral route being the most prevalent route of administration. This review also presents characterization strategies for oral delivery of peptides with the aim of illuminating developability issues with the drug candidate. A brief overview of other routes of administration, including inhaled, transdermal, and intranasal routes, is provided as these routes are generally preferred by patients over injectables. Finally, this review presents formulation techniques to mitigate some of the developability obstacles associated with peptide delivery. The authors emphasize opportunities for the thoughtful application of pharmaceutical science to the development of peptide drugs and to the general advancement of this promising class of pharmaceuticals.
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Affiliation(s)
- Annette Bak
- Discovery Pharmaceutical Sciences, Merck & Co, Kenilworth, New Jersey, USA,
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Janich C, Wölk C, Taßler S, Drescher S, Meister A, Brezesinski G, Dobner B, Langner A. Composites of malonic acid diamides and phospholipids - Structural parameters for optimal transfection efficiency in A549 cells. EUR J LIPID SCI TECH 2014. [DOI: 10.1002/ejlt.201300405] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Christopher Janich
- Martin Luther University (MLU) Halle-Wittenberg; Institute of Pharmacy; Halle (Saale) Germany
| | - Christian Wölk
- Martin Luther University (MLU) Halle-Wittenberg; Institute of Pharmacy; Halle (Saale) Germany
| | - Stephanie Taßler
- Max Planck Institute of Colloids and Interfaces; Potsdam Germany
| | - Simon Drescher
- Martin Luther University (MLU) Halle-Wittenberg; Institute of Pharmacy; Halle (Saale) Germany
| | - Annette Meister
- Centre for Structure and Dynamics of Proteins (MZP); MLU Halle-Wittenberg; Halle (Saale) Germany
| | | | - Bodo Dobner
- Martin Luther University (MLU) Halle-Wittenberg; Institute of Pharmacy; Halle (Saale) Germany
| | - Andreas Langner
- Martin Luther University (MLU) Halle-Wittenberg; Institute of Pharmacy; Halle (Saale) Germany
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Wölk C, Pawlowska D, Drescher S, Auerswald A, Meister A, Hause G, Blume A, Langner A, Brezesinski G, Dobner B. New micellar transfection agents. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:4905-4915. [PMID: 24697720 DOI: 10.1021/la404860w] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Two novel micelle-forming amino-functionalized lipids (OT6 and TT6) bearing two alkyl chains connected to a large positively charged hexavalent headgroup, which might be interesting polynucleotide transferring agents with the advantage of an easy and reproducible production of micelle dispersions, have been characterized. The critical micelle concentration (cmc) of both lipids has been determined by two different methods, namely, isothermal titration calorimetry (ITC) and 1,6-diphenyl-1,3,5-hexatriene (DPH) fluorescence experiments. In addition, the lipid dispersions were studied as a function of temperature using differential scanning calorimetry (DSC), dynamic light scattering (DLS), Fourier-transform infrared (FT-IR) spectroscopy, and cryo-transmission electron microscopy (cryo-TEM). The OT6 and TT6 micelles effectively complex DNA as determined by ITC and DSC measurements. In addition, DLS and ζ-potential measurements were performed to determine lipoplex formulations that exhibit colloidal stability. Finally, the structures of OT6/DNA complexes were investigated by means of X-ray scattering and TEM.
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Affiliation(s)
- Christian Wölk
- Institute of Pharmacy, Martin-Luther-Universitaet (MLU) Halle-Wittenberg , Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
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