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Home > Medicine & Health Science textbooks > Medical specialties, branches of medicine > Pharmacology > Effective DNA Delivery Mediated by PH Responsive Peptides
Effective DNA Delivery Mediated by PH Responsive Peptides

Effective DNA Delivery Mediated by PH Responsive Peptides


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About the Book

This dissertation, "Effective DNA Delivery Mediated by PH Responsive Peptides" by Fu-lun, Chan, 陳賦麟, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Non-viral vectors have been used to deliver therapeutic genes to treat different diseases. There are a variety of non-viral vectors such as liposomes, cationic polymers and peptides. Among all, pH responsive peptides showed excellent DNA transfection efficiency in many types of cell. These peptides are capable of changing their structural conformation as pH decreases, adopting a disordered structure which can destabilize endosomal membrane and therefore enhancing the release of DNA from endosomes into cytosol. Traditional pH responsive histidine-rich peptides showed good DNA transfection efficiency and low toxicity to the cells when compared with other non-viral vectors. However, their low pKa value restricted these peptides to be protonated only at late endosomal stage, in which DNA is extremely susceptible to endosomal degradation. This hindered the DNA to be released to the cytosol efficiently and therefore reduced DNA transfection efficiency. In response to this, it is of great interest to probe into the insertion of either 2,3-diaminopropionic acid (Dap) or methylated-2,3-diaminopropionic acid Dap(Me) to the peptide as alternative pH sensitive components. The pKa values for both Dap and Dap(Me) peptides are higher than that of histidine. It is anticipated that the higher pKa value, the protonation of peptide could be happened at an earlier stage of endosomal maturation. Such protonation of peptide destabilizes the endosome membrane rapidly, causing the release of DNA to the cytosol effectively and hence improving DNA transfection efficiency. In this experiment, LADap(Me)4-L1 peptide was the optimal candidate within the series. It showed good DNA transfection efficiency and cell viability in A549 cells among all Dap and Dap(Me) peptides. DOI: 10.5353/th_b4833333 Subjects: Peptides Gene targeting Genetic vectors Gene therapy


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Product Details
  • ISBN-13: 9781361282007
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 68
  • Weight: 181 gr
  • ISBN-10: 1361282002
  • Publisher Date: 26 Jan 2017
  • Binding: Paperback
  • Language: English
  • Spine Width: 4 mm
  • Width: 216 mm


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