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Related Concept Videos

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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...
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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...
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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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Nanotherapeutics shielded with a pH responsive polymeric layer.

L Kostka1, V Šubr, R Laga

  • 1Department of Biomedicinal Polymers, Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic. kostka@imc.cas.cz.

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|October 9, 2015
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Summary
This summary is machine-generated.

Researchers developed a novel system to improve nanotherapeutic delivery by using acid-degradable polymer coatings. This system enhances stability in the bloodstream and enables targeted release within cells, improving gene delivery efficiency.

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Drug Delivery

Background:

  • Nanotherapeutics face challenges with bloodstream instability and immune recognition, hindering efficient intravenous delivery.
  • Hydrophilic polymer coatings enhance systemic circulation and target accessibility for nanocarriers and viral vectors.
  • Acid-degradable polymers offer a strategy for triggered release in acidic tumor microenvironments or intracellular compartments.

Purpose of the Study:

  • To design and evaluate an acid-degradable polymer coating system for enhanced nanotherapeutic and viral vector delivery.
  • To investigate the principle of a polymer coat being shed after cellular uptake.
  • To assess the applicability of this system for adenoviral vectors.

Main Methods:

  • Development of an acid-degradable polymer coating for nanocarriers.
  • Design of a system capable of shedding the polymer coat post-cellular transport.
  • Biological studies using adenoviral vectors to demonstrate the principle's efficacy.

Main Results:

  • The developed system demonstrated the ability to "throw away" the polymer coat after vector transport into target cells.
  • Initial biological studies confirmed the principle's applicability for real adenoviral vectors.
  • Coated adenoviral vectors showed significantly reduced transfection ability at physiological pH (7.4) compared to acidic conditions (pH 5.4), with a 75-fold difference.

Conclusions:

  • Acid-degradable polymer coatings represent a promising strategy for improving the stability and targeted delivery of nanotherapeutics and viral vectors.
  • The developed system effectively shields viral vectors in circulation and facilitates release upon encountering acidic intracellular environments.
  • This approach enhances gene delivery efficiency by modulating vector properties and enabling controlled release.