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Related Concept Videos

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...
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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 called...

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High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles
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Published on: July 6, 2012

Mannosylated dextran nanoparticles: a pH-sensitive system engineered for immunomodulation through mannose targeting.

Lina Cui1, Joel A Cohen, Kyle E Broaders

  • 1College of Chemistry, University of California-Berkeley, CA 94720-1460, United States.

Bioconjugate Chemistry
|April 12, 2011
PubMed
Summary

Researchers developed a novel mannosylated particulate system using pH-sensitive materials for enhanced antigen delivery. This system improves antigen presentation by dendritic cells (DCs), offering a promising platform for advanced vaccine development.

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Area of Science:

  • Biomaterials Science
  • Immunology
  • Drug Delivery Systems

Background:

  • Biotherapeutic delivery requires advanced materials that are easily modifiable, biocompatible, and enable triggered release.
  • Antigen delivery systems need to efficiently interact with antigen-presenting cells (APCs) to modulate immune responses.
  • Dendritic cells (DCs) play a crucial role in initiating adaptive immunity through antigen presentation.

Purpose of the Study:

  • To develop and characterize a novel polysaccharide-based particulate system for biotherapeutic delivery.
  • To functionalize the particles with mannose ligands to target cell-surface receptors on APCs.
  • To evaluate the efficacy of mannosylated particles in enhancing antigen presentation by dendritic cells (DCs).

Main Methods:

  • Fabrication of pH-sensitive polysaccharide particles.
  • Modification of particles with mannose-based ligands.
  • In vitro assessment of antigen uptake and presentation by dendritic cells (DCs) using mannosylated and control particles.
  • Analysis of antigen presentation in the context of major histocompatibility complex (MHC) class I molecules.

Main Results:

  • The developed particulate system is pH-sensitive and readily functionalized with mannose ligands.
  • Mannosylated particles demonstrated enhanced internalization and activation of APCs compared to unmodified particles.
  • Mannosylated particles significantly improved antigen presentation by DCs on MHC class I molecules in vitro.

Conclusions:

  • This study presents the first mannosylated particulate system capable of enhancing MHC class I antigen presentation by DCs.
  • The pH-sensitive, functionalizable material offers a versatile platform for targeted antigen delivery.
  • This system holds potential for developing next-generation, optimally modulated vaccine delivery systems.