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Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

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Selectivity in bone targeting with multivalent dendritic polyanion dye conjugates.

Dominic Gröger1, Michael Kerschnitzki, Marie Weinhart

  • 1Institute of Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, D-14195, Berlin, Germany.

Advanced Healthcare Materials
|September 3, 2013
PubMed
Summary
This summary is machine-generated.

Dendritic polyglycerol (dPG) polyanions functionalized with phosphorous groups show high hydroxyapatite (HA) affinity, offering potential bone therapeutics. These dPG conjugates are non-toxic and suitable for bone imaging, tissue engineering, and drug delivery.

Keywords:
bisphosphonatesbone targetingconjugateshydroxyapatiteinflammation

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Targeting bone with anionic macromolecules is crucial for developing diagnostics and therapeutics for bone diseases.
  • Dendritic polyglycerol (dPG) offers a versatile scaffold for creating functionalized polymers.

Purpose of the Study:

  • To synthesize and characterize novel dendritic polyglycerol (dPG) polyanion dye conjugates.
  • To evaluate the bone-targeting capabilities and biocompatibility of these dPG conjugates.

Main Methods:

  • Modular synthesis of dPG polyanions (sulfates, sulfonates, carboxylates, phosphates, phosphonates, bisphosphonates) using click chemistry.
  • Confocal laser scanning microscopy to investigate bone section microarchitecture.
  • Quantitative hydroxyapatite (HA) binding assays.
  • Cytotoxicity studies using murine fibroblasts.

Main Results:

  • Phosphorous-containing dPG conjugates (bisphosphonate, phosphonate, phosphate) exhibited strong bone penetration and high HA affinity.
  • Sulfates, sulfonates, and carboxylates showed weaker HA binding but higher affinity for collagen.
  • All synthesized dPG conjugates demonstrated no significant cytotoxicity and were internalized by cells within 24 hours.

Conclusions:

  • Dendritic polyphosphates and phosphonates are promising alternatives to bisphosphonates for bone-targeting applications.
  • The modular synthesis allows for versatile extensions for bone imaging, tissue engineering, and drug delivery.
  • These dPG conjugates hold significant potential for advancing bone-related diagnostics and therapeutics.