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Related Concept Videos

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Body:Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...
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Biodegradable Polyglycerols Combining Antioxidant Activity and Sulfation-Induced Complement Inhibition.

Hanna Koeppe1, Daniel Horn1, Jens Dernedde2

  • 1Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany.

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This summary is machine-generated.

New polyglycerol copolymers offer biodegradability and antioxidant properties. Sulfated versions show potential for treating oxidative stress-related inflammation by inhibiting complement activation.

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Area of Science:

  • Polymer Chemistry
  • Biomaterials Science
  • Medicinal Chemistry

Background:

  • Polyglycerol platforms are valuable for polymer therapeutics due to their inherent multifunctionality and biocompatibility.
  • Introducing biodegradability and antioxidant properties enhances polyglycerol's therapeutic potential.
  • Cyclic comonomers with thioether and ester functionalities are key to modifying the polyglycerol backbone.

Purpose of the Study:

  • To synthesize novel hyperbranched polyglycerol copolymers incorporating biodegradability and antioxidant functionalities.
  • To functionalize these copolymers with sulfate groups to explore their potential in modulating inflammatory responses.
  • To evaluate the cytocompatibility, antioxidant activity, and complement inhibitory effects of the developed materials.

Main Methods:

  • Anionic ring-opening copolymerization of glycidol with 1,4-oxathiepan-7-one (GOTO) or thiodiglycolic anhydride (GTA).
  • Characterization of copolymer molecular weight, comonomer incorporation, and water solubility.
  • Sulfation of copolymers to yield GOTO-S and GTA-S, followed by assessment of the degree of sulfation.
  • Evaluation of cytocompatibility, in vitro antioxidant activity (ABTS assay), and complement activation inhibition.

Main Results:

  • Hyperbranched polyglycerol copolymers (GOTO and GTA) with 10 kDa molecular weight and 10 mol% comonomer incorporation were successfully synthesized, maintaining water solubility.
  • Sulfated derivatives (GOTO-S and GTA-S) exhibited a high degree of sulfation.
  • All synthesized copolymers demonstrated good cytocompatibility and biodegradability under physiological conditions.
  • Significant antioxidant activity was observed, attributed to the thioether groups, with GTA showing the strongest radical scavenging capacity.
  • Sulfated derivatives effectively inhibited complement activation, with potencies comparable to known anticoagulants like dPGS and heparin.

Conclusions:

  • Novel biodegradable and antioxidant polyglycerol copolymers were developed by incorporating cyclic thioether/ester comonomers.
  • The sulfated polyglycerol derivatives exhibit potent complement inhibitory activity, suggesting therapeutic potential.
  • These materials show promise for applications targeting oxidative stress-related inflammatory conditions.