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Related Concept Videos

Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...
Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
Modified-Release Drug Delivery Systems: Classification01:23

Modified-Release Drug Delivery Systems: Classification

Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...
Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

Modified-Release Drug Delivery Systems: Rate-Programmed II

Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
Modified-Release Drug Delivery Systems: Rate-Programmed I01:22

Modified-Release Drug Delivery Systems: Rate-Programmed I

Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.

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Modulating Shape of Polyester Based Polymersomes using Osmotic Pressure
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Modulating Shape of Polyester Based Polymersomes using Osmotic Pressure

Published on: April 21, 2021

Stimuli-responsive polymersomes for programmed drug delivery.

Fenghua Meng1, Zhiyuan Zhong, Jan Feijen

  • 1Biomedical Polymers Laboratory, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, People's Republic of China.

Biomacromolecules
|January 7, 2009
PubMed
Summary
This summary is machine-generated.

Intelligent polymersomes, or polymeric vesicles, offer advanced drug delivery by responding to stimuli like pH and temperature. This stimuli-responsive release enhances therapeutic efficacy and minimizes side effects.

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Area of Science:

  • Polymer science
  • Nanotechnology
  • Biomedical engineering

Background:

  • Polymersomes, also known as polymeric vesicles, are gaining interest for their cell-mimicking properties and applications in medicine and biotechnology.
  • Unlike liposomes, polymersomes are synthesized from macromolecular amphiphiles, offering enhanced stability and tunable membrane characteristics.

Purpose of the Study:

  • To review recent advancements in stimuli-sensitive polymersomes.
  • To discuss the potential of these intelligent drug delivery systems.

Main Methods:

  • Synthesis of polymersomes from various amphiphilic copolymer architectures.
  • Development of polymersomes responsive to stimuli such as pH, temperature, light, and magnetic fields.
  • Investigating stimuli-responsive release mechanisms for encapsulated therapeutics.

Main Results:

  • Polymersomes demonstrate high stability and versatility in transporting hydrophilic and hydrophobic substances.
  • Stimuli-sensitive polymersomes enable programmable and modulated release of encapsulated contents.
  • Stimuli-responsive polymersomes can be formed and disassembled in water via external triggers.

Conclusions:

  • Stimuli-sensitive polymersomes represent a promising programmable delivery system for enhanced therapeutic efficacy.
  • Further development of these intelligent systems holds significant potential for future pharmaceutical and biotechnological applications.