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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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Progesterone binding nano-carriers based on hydrophobically modified hyperbranched polyglycerols.

M Alizadeh Noghani1, D E Brooks2

  • 1Centre for Blood Research and Departments of Chemistry, University of British Columbia, Vancouver, BC, Canada V6T 1Z3.

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We developed a novel polymer (HPG-Cn-MPEG) to improve progesterone (Pro) solubility and delivery for traumatic brain injury recovery. This enhances progesterone

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Area of Science:

  • Neuroscience
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Progesterone (Pro) is a neurosteroid that aids recovery from traumatic brain injury (TBI).
  • Poor water solubility limits Pro's clinical use.
  • Novel drug delivery systems are needed to overcome Pro's limitations.

Purpose of the Study:

  • To develop a polymer-based system for enhanced progesterone solubility, stability, and bioavailability.
  • To investigate the relationship between polymer structure and progesterone release kinetics.

Main Methods:

  • Synthesis and characterization of hydrophobically modified hyperbranched polyglycerol (HPG-Cn-MPEG).
  • Loading of progesterone into the HPG-Cn-MPEG polymer.
  • Analysis of progesterone release kinetics using Differential Scanning Calorimetry (DSC).
  • Correlation of release rates with polymer structural properties (molecular weight, alkylation, bound water).

Main Results:

  • HPG-Cn-MPEG effectively enhanced progesterone solubility, stability, and bioavailability.
  • Progesterone loading correlated with the hydrophobicity (alkyl carbon content) of the polymer.
  • Progesterone release rate was strongly dependent on the amount of structured water within the polymer's dendritic domain.
  • DSC studies provided insights into polymer-drug interactions.

Conclusions:

  • HPG-Cn-MPEG is a promising carrier for improving progesterone delivery for TBI treatment.
  • Polymer structure, particularly bound water content, significantly influences drug release kinetics.
  • Further studies in biological systems (cells and animal models) are warranted.