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Related Experiment Video

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Preparation and Characterization of Nanoliposomes for the Entrapment of Bioactive Hydrophilic Globular Proteins
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Serum-stable, long-circulating, pH-sensitive PEGylated liposomes.

Nicolas Bertrand1, Pierre Simard, Jean-Christophe Leroux

  • 1Faculty of Pharmacy, University of Montreal, Montreal, QC, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|January 15, 2010
PubMed
Summary

pH-sensitive liposomes release drugs in acidic cell compartments, improving cytoplasmic drug delivery. These novel vesicles offer enhanced stability and targeted release for therapeutic applications.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Drug Delivery Systems

Background:

  • Liposomes are widely used for drug delivery, but achieving targeted release within specific cellular compartments remains a challenge.
  • Acidic environments within intracellular organelles like endosomes and lysosomes necessitate specialized delivery systems.
  • Conventional liposomes can degrade before releasing their payload in the target acidic milieu.

Purpose of the Study:

  • To design and characterize pH-sensitive liposomes for targeted drug delivery to acidic intracellular organelles.
  • To develop liposomal formulations with stability at physiological pH and rapid drug release in acidic conditions.
  • To investigate the incorporation of a specific copolymer for enhanced pH-responsiveness.

Main Methods:

  • Synthesis of a hydrophobically modified N-isopropylacrylamide/methacrylic acid copolymer (poly(NIPAM-co-MAA)).
  • Incorporation of the synthesized copolymer into the lipid bilayer of sterically stabilized liposomes.
  • Preparation and characterization of large unilamellar pH-sensitive vesicles.
  • Evaluation of liposome stability at physiological pH and drug release at acidic pH (5.0-5.5).

Main Results:

  • The developed pH-sensitive liposomes exhibit stability at physiological pH (7.4).
  • These liposomes demonstrate rapid and efficient drug release at acidic pH values (5.0-5.5), mimicking endosomal conditions.
  • The incorporation of poly(NIPAM-co-MAA) facilitates environment-controlled drug release.
  • Serum-stable formulations with minimal leakage were successfully prepared.

Conclusions:

  • pH-sensitive liposomes incorporating poly(NIPAM-co-MAA) are effective for targeted drug delivery to acidic intracellular compartments.
  • These systems offer controlled drug release, protecting the payload until it reaches the acidic environment.
  • The developed vesicles present a promising platform for augmenting cytoplasmic drug concentrations and improving therapeutic efficacy.