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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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Related Experiment Video

Updated: May 14, 2026

Fabricating and Labeling Microbubbles with Fluorescent and Radioactive Tracers
10:40

Fabricating and Labeling Microbubbles with Fluorescent and Radioactive Tracers

Published on: January 24, 2025

Microbubbles and their applications in pharmaceutical targeting.

Pradnya Palekar-Shanbhag1, Manasi M Chogale, Sneha V Jog

  • 1Department of Pharmaceutics, Vivekanand Education Society's College of Pharmacy, Hashu Advani Memorial Complex, Chembur, Mumabi-74, India. drpradnyaps@gmail.com

Current Drug Delivery
|January 31, 2013
PubMed
Summary

Microbubbles, gas-filled spheres coated in polymers or phospholipids, serve dual roles in ultrasound imaging and targeted drug/gene delivery. Their response to ultrasound varies with intensity, enabling contrast enhancement or therapeutic payload release.

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Multi-timescale Microscopy Methods for the Characterization of Fluorescently-labeled Microbubbles for Ultrasound-Triggered Drug Release
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Multi-timescale Microscopy Methods for the Characterization of Fluorescently-labeled Microbubbles for Ultrasound-Triggered Drug Release

Published on: June 12, 2021

Related Experiment Videos

Last Updated: May 14, 2026

Fabricating and Labeling Microbubbles with Fluorescent and Radioactive Tracers
10:40

Fabricating and Labeling Microbubbles with Fluorescent and Radioactive Tracers

Published on: January 24, 2025

Multi-timescale Microscopy Methods for the Characterization of Fluorescently-labeled Microbubbles for Ultrasound-Triggered Drug Release
06:02

Multi-timescale Microscopy Methods for the Characterization of Fluorescently-labeled Microbubbles for Ultrasound-Triggered Drug Release

Published on: June 12, 2021

Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Acoustic Physics

Background:

  • Microbubbles are 1-10 micron gas-filled spheres with polymer or phospholipid shells.
  • They are investigated for ultrasound contrast enhancement and as carriers for drug and gene delivery.
  • Their acoustic behavior is influenced by shell properties and gas content.

Purpose of the Study:

  • To explore the dual applications of microbubbles in diagnostic imaging and therapeutic delivery.
  • To elucidate the mechanism of microbubble interaction with ultrasound at varying mechanical indices.
  • To highlight the potential for targeted delivery through surface modification.

Main Methods:

  • Utilizing ultrasound at different mechanical indices to observe microbubble responses.
  • Characterizing microbubble properties (shell composition, thickness, gas properties).
  • Investigating ligand-mediated cell targeting for enhanced specificity.

Main Results:

  • Low mechanical index ultrasound induces microbubble oscillation for enhanced imaging signals.
  • High mechanical index ultrasound causes microbubble rupture, facilitating drug/gene release.
  • Surface modification with ligands enables targeted cellular interaction.

Conclusions:

  • Microbubbles offer versatile applications in medical diagnostics and therapeutics.
  • Ultrasound parameters can be tuned to control microbubble function for imaging or drug delivery.
  • Ligand-functionalized microbubbles provide a platform for targeted therapies.