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Related Concept Videos

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

Modified-Release Drug Delivery Systems: Site-Targeted

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.
Targeted Cancer Therapies02:57

Targeted Cancer Therapies

The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
There are several types of targeted therapies against specific...

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Related Experiment Video

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Modeling Brain Metastasis by Internal Carotid Artery Injection of Cancer Cells
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Design considerations for tumour-targeted nanoparticles.

Hak Soo Choi1, Wenhao Liu, Fangbing Liu

  • 1Division of Hematology/Oncology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02215, USA.

Nature Nanotechnology
|November 7, 2009
PubMed
Summary
This summary is machine-generated.

Targeted nanoparticles for cancer imaging can be designed for rapid kidney clearance. This study provides design rules for developing safe, effective, and eliminable nanomedicines.

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Radiology

Background:

  • Inorganic/organic hybrid nanoparticles offer biomedical potential but require efficient clearance to prevent toxicity.
  • Renal clearance of nanoparticles is crucial for their safe clinical translation.
  • Previous work established size and surface charge parameters for kidney clearance of quantum dots.

Purpose of the Study:

  • To investigate the renal clearance of targeted quantum dots (QDs) for biomedical applications.
  • To determine the impact of ligand density on QD renal clearance.
  • To establish design principles for clinically translatable, kidney-cleared targeted nanoparticles.

Main Methods:

  • Functionalization of quantum dots with high-affinity small-molecule tumor-targeting ligands.
  • Assessment of hydrodynamic diameter and ligand density.
  • In vivo imaging studies in animal models of prostate cancer and melanoma.
  • Evaluation of renal clearance rates post-injection.

Main Results:

  • Quantum dots functionalized with targeting ligands were cleared by the kidneys.
  • A hydrodynamic diameter below approximately 5.5 nm is necessary for renal clearance.
  • An upper limit of 5-10 ligands per QD ensures renal clearance.
  • Receptor-specific imaging and clearance within 4 hours were observed in cancer models.

Conclusions:

  • Quantum dots functionalized with targeting ligands can achieve renal clearance.
  • Hydrodynamic diameter and ligand density are critical parameters for designing kidney-cleared nanoparticles.
  • These findings provide a framework for developing targeted nanoparticles for clinical applications with predictable elimination.