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Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

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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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Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

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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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Related Experiment Video

Updated: Apr 11, 2026

Preparation and Characterization of Lipophilic Doxorubicin Pro-drug Micelles
09:56

Preparation and Characterization of Lipophilic Doxorubicin Pro-drug Micelles

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Smart sarcosinate-based catanionic vesicles for efficient doxorubicin delivery in tumor microenvironments.

Rui L Machado1,2, Isabel S Oliveira1, Karenina Santos1,2

  • 1CIQUP, IMS, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal. isabel.oliveira@fc.up.pt.

Nanoscale
|November 5, 2025
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Summary

New pH-sensitive catanionic vesicles show promise for cancer therapy. These biocompatible nanocarriers efficiently deliver drugs like doxorubicin (DOX) to cancer cells, enhancing efficacy and reducing toxicity at low doses.

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Using In Vitro Live-cell Imaging to Explore Chemotherapeutics Delivered by Lipid-based Nanoparticles
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Catanionic mixtures form self-assembled aggregates with tunable properties, offering potential for drug delivery.
  • Existing catanionic vesicles often lack favorable cytotoxicity, high drug loading, and bioactivity.
  • Developing biocompatible and effective nanocarriers for chemotherapy remains a significant challenge.

Purpose of the Study:

  • To systematically investigate pH-sensitive catanionic vesicles for drug delivery applications.
  • To evaluate the cytotoxicity, drug loading, and release profiles of novel vesicle formulations.
  • To assess the *in vitro* efficacy of drug-loaded vesicles in cancer cells.

Main Methods:

  • Formulation of catanionic vesicles using sodium lauroyl sarcosinate (SLSar) and cationic double-tailed surfactants.
  • Characterization of vesicle properties including size, surface charge, and colloidal stability.
  • Cytotoxicity screening using L929 fibroblasts and doxorubicin (DOX) encapsulation and release studies.

Main Results:

  • Spontaneous formation of stable vesicles at low critical aggregation concentrations.
  • Gemini/SLSar systems demonstrated superior DOX encapsulation efficiency and pH-sensitive release at acidic pH.
  • Rapid cellular uptake and potent cytotoxicity of DOX-loaded vesicles at significantly lower concentrations than free DOX.

Conclusions:

  • SLSar-based catanionic vesicles represent a simple, stable, and tunable platform for drug delivery.
  • These vesicles show significant potential for pH-responsive, low-dose cancer chemotherapy.
  • The enhanced therapeutic efficacy suggests potential for reduced systemic toxicity in cancer treatment.