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The Early Endosome: Endocytosis of Transferrin01:28

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Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...
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Related Experiment Video

Updated: Dec 9, 2025

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles
08:26

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Published on: October 19, 2015

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Tailoring Iron Oxide Nanoparticles for Efficient Cellular Internalization and Endosomal Escape.

Laura Rueda-Gensini1, Javier Cifuentes1, Maria Claudia Castellanos1

  • 1Department of Biomedical Engineering, School of Engineering, Universidad de Los Andes, Carrera 1 No. 18A-12, 111711 Bogotá, Colombia.

Nanomaterials (Basel, Switzerland)
|September 16, 2020
PubMed
Summary

Iron oxide nanoparticles (IONs) offer magnetic targeting for biomedical uses. Surface modifications enhance IONs

Keywords:
drug deliveryendocytosisendosomal escapeiron oxide nanoparticles

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Using Magnetometry to Monitor Cellular Incorporation and Subsequent Biodegradation of Chemically Synthetized Iron Oxide Nanoparticles
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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Materials Science

Background:

  • Iron oxide nanoparticles (IONs) are biocompatible, versatile, and superparamagnetic.
  • IONs can be magnetically guided for targeted delivery and cellular marking.
  • Efficient endocytosis, lysosomal escape, and intracellular function remain challenges for IONs in medicine.

Purpose of the Study:

  • To review mechanisms of endosomal pathway activation by magnetic IONs.
  • To explore ION properties governing endosomal escape and nuclear transfection.
  • To highlight ION surface modifications for enhanced cellular uptake and therapeutic delivery.

Main Methods:

  • Review of literature on IONs in biomedical applications.
  • Analysis of endosomal pathway dynamics and ION interactions.
  • Examination of surface modification strategies for IONs.

Main Results:

  • ION surface modifications facilitate endocytic uptake and endosomal escape.
  • Specific modifications enhance nuclear transfection for therapeutic applications.
  • Understanding these processes enables rational design of ION-based nanocarriers.

Conclusions:

  • ION surface engineering is crucial for optimizing nanocarrier performance.
  • IONs can be rationally designed for cell tracking, imaging, and targeted drug/gene delivery.
  • Further research into ION-endosome interactions will advance translational nanomedicine.