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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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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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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...
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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...
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pH-responsive micro- and nanocarrier systems.

Sabrina Nowag1, Rainer Haag

  • 1Freie Universität Berlin, Institute of Chemistry and Biochemistry, Takustrasse 3, 14195 Berlin (Germany) http://www.polytree.de.

Angewandte Chemie (International Ed. in English)
|December 6, 2013
PubMed
Summary
This summary is machine-generated.

pH gradients enable controlled drug release from delivery systems. Tailored micro- and nanocarriers ensure biocompatibility and long circulation times for enhanced therapeutic delivery.

Keywords:
drug deliverymacromolecular carrier systemspolyglycerolspolyphenolsself-assembly

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Area of Science:

  • Biomaterials Science
  • Drug Delivery
  • Nanotechnology

Background:

  • pH gradients exist between extracellular and intracellular environments.
  • Controlled release of drugs and biological cargos is crucial for effective therapies.
  • Biocompatible delivery systems require multiple criteria, including prolonged blood circulation.

Purpose of the Study:

  • To explore the utilization of pH gradients for on-demand drug release.
  • To discuss the design of biocompatible carrier systems with pH-cleavable units.
  • To highlight strategies for achieving long blood circulation times in drug delivery systems.

Main Methods:

  • Designing macromolecular architectures for micro- and nanocarriers.
  • Developing stable self-assembled systems for drug encapsulation.
  • Incorporating pH-cleavable units into carrier systems.

Main Results:

  • pH gradients can be effectively leveraged for controlled release applications.
  • Tailored micro- and nanocarriers demonstrate potential for enhanced drug delivery.
  • Macromolecular architectures and self-assembled systems contribute to system stability.

Conclusions:

  • pH-responsive drug delivery systems offer a promising therapeutic approach.
  • Careful design of nanocarriers is essential for optimizing release kinetics and circulation.
  • Future research should focus on translating these systems for clinical applications.