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Oligonucleotide Complexes with Cell-Penetrating Peptides: Structure, Binding, Translocation and Flux in Lipid Membranes
Stockholm University, Faculty of Science, Department of Neurochemistry.ORCID iD: 0000-0001-7522-8964
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The ability of cell-penetrating peptides to cross plasma membranes has been explored for various applications, including the delivery of bioactive molecules to inhibit disease-causing cellular processes. The uptake mechanisms by which cell-penetrating peptides enter cells depend on the conditions, such as the cell line the concentration and the temperature. To be used as therapeutics, each novel cell-penetrating peptide needs to be fully characterized, including their physicochemical properties, their biological activity and their uptake mechanism. Our group has developed a series of highly performing, non-toxic cell-penetrating peptides, all derived from the original sequence of transportan 10. These analogs are called PepFects and NickFects and they are now a diverse family of N-terminally stearylated peptides. These peptides are known to form noncovalent, nano-sized complexes with diverse oligonucleotide cargoes. One bottleneck that limits the use of this technology for gene therapy applications is the efficient release of the internalized complexes from endosomal vesicles.

The general purpose of this thesis is to reveal the mechanisms by which our in house designed peptides enter cells and allow the successful transport of biofunctional oligonucleotide cargo. To reach this goal, we used both biophysical and cell biology methods. We used spectroscopy methods, including fluorescence, circular dichroism and dynamic light scattering to reveal the physicochemical properties. Using confocal and transmission electron microscopy we observed and tracked the internalization and intracellular trafficking. Additionally we tested the biological activity in vitro and the cellular toxicity of the delivery systems.

We conclude that the transport vectors involved in this study are efficient at perturbing lipid membranes, which correlates with their remarkable capacity to transport oligonucleotides into cells. The improved and distinct capacities to escape from endosomal vesicles can be the result of their different structures and hydrophobicity. These findings extend the knowledge of the variables that condition intracellular Cell-penetrating peptide mediated transport of nucleic acids, which ultimately translates into a small step towards successful non-viral gene therapy.

Place, publisher, year, edition, pages
Stockholm: Department of Neurochemistry, Stockholm University , 2014. , 32 p.
Keyword [en]
Cell-penetrating peptide, Large unilamellar vesicle, Membrane perturbation, Endosomal escape
National Category
Biochemistry and Molecular Biology
Research subject
Neurochemistry with Molecular Neurobiology
Identifiers
URN: urn:nbn:se:su:diva-109299ISBN: 978-91-7649-029-7 (print)OAI: oai:DiVA.org:su-109299DiVA: diva2:763943
Presentation
2014-11-17, C 458 (Heilbronnsalen), Svante Arrhenius väg 16 B, Stockholm, 16:55 (English)
Opponent
Supervisors
Available from: 2014-11-17 Created: 2014-11-17 Last updated: 2015-03-17Bibliographically approved
List of papers
1. Differential Endosomal Pathways for Radically Modified Peptide Vectors
Open this publication in new window or tab >>Differential Endosomal Pathways for Radically Modified Peptide Vectors
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2013 (English)In: Bioconjugate chemistry, ISSN 1043-1802, E-ISSN 1520-4812, Vol. 24, no 10, 1721-1732 p.Article in journal (Refereed) Published
Abstract [en]

In the current work we characterize the uptake mechanism of two NickFect family members, NF51 and NF1, related to the biological activity of transfected plasmid DNA (pDNA). Both vectors condense pDNA into small negatively charged nanoparticles that transfect He La cells with equally high efficacy and the delivery is mediated by SCARA3 and SCARA.5 receptors. NF1 condenses DNA into less homogeneous and less stable nanoparticles than NF51. NF51/pDNA nanoparticles enter the cells via macropinocytosis, while NF1/pDNA complexes use clathrin- or caveolae-mediated endocytosis and macropinocytosis. Analysis of separated endosomal compartments uncovered lysomotropic properties of NF51 that was also proven by cotransfection with chloroquine. In summary we characterize how radical modifications in peptides, such as introducing a kink in the structure of NF51 or including extra negative charge by phospho-tyrosine substitution in NF1, resulted in equally high efficacy for gene delivery, although this efficacy is achieved by using differential transfection pathways.

National Category
Biochemistry and Molecular Biology Chemical Sciences
Identifiers
urn:nbn:se:su:diva-96658 (URN)10.1021/bc4002757 (DOI)000326125500009 ()
Note

AuthorCount:8;

Available from: 2013-11-26 Created: 2013-11-25 Last updated: 2017-12-06Bibliographically approved
2. Effects of cargo molecules on membrane perturbation caused by transportan10 based cell-penetrating peptides
Open this publication in new window or tab >>Effects of cargo molecules on membrane perturbation caused by transportan10 based cell-penetrating peptides
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2014 (English)In: Biochimica et Biophysica Acta, ISSN 0006-3002, E-ISSN 1878-2434, Vol. 1838, no 12, 3118-3129 p.Article in journal (Refereed) Published
Abstract [en]

Cell-penetrating peptides with the ability to escape endosomes and reach the target are of great value as delivery vectors for different bioactive cargoes and future treatment of human diseases. We have studied two such peptides, NickFect1 and NickFect51, both originated from stearylated transportan10 (PF3). To obtain more insight into the mechanism(s) of peptide delivery and the biophysical properties of an efficient vector system, we investigated the effect of different bioactive oligonucleotide cargoes on peptide-membrane perturbation and peptide structural induction. We studied the membrane interactions of the peptides with large unilamellar vesicles and compared their effects with parent peptides transportan10 and PF3. In addition, cellular uptake and peptide-mediated oligonucleotide delivery were analyzed. Calcein leakage experiments showed that similar to transportan10, NickFect51 caused a significant degree of membrane leakage, whereas NickFect1, similar to PF3, was less membrane perturbing. The results are in agreement with previously published results indicating that NickFect51 is a more efficient endosomal escaper. However, the presence of a large cargo like plasmid DNA inhibited NickFect's membrane perturbation and cellular uptake efficiency of the peptide was reduced. We conclude that the pathway for cellular uptake of peptide complexes is cargo dependent, whereas the endosomal escape efficacy depends on peptide hydrophobicity and chemical structure. For small interfering RNA delivery, NickFect51 appears to be optimal. The biophysical signature shows that the peptide alone causes membrane perturbation, but the cargo complex does not. These two biophysical characteristics of the peptide and its cargo complex may be the signature of an efficient delivery vector system.

National Category
Biochemistry and Molecular Biology
Research subject
Neurochemistry with Molecular Neurobiology
Identifiers
urn:nbn:se:su:diva-109101 (URN)10.1016/j.bbamem.2014.08.011 (DOI)000343847200015 ()25135660 (PubMedID)
Available from: 2014-11-12 Created: 2014-11-12 Last updated: 2017-12-05Bibliographically approved

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