Related Experiment Video
Updated: Jan 28, 2026
09:28
Enrich and Expand Rare Antigen-specific T Cells with Magnetic Nanoparticles
Published on: November 17, 2018
12.0K
Magnetic Detection of Cancer Cells Using Tumor-Homing Peptide-Modified Magnetic Nanoparticles
Shengli Zhou1, Yuji Furutani1, Kei Yamashita1
1Department of Interdisciplinary Science and Engineering in Health Systems, Okayama University, 3-1-1 Tsushimanaka, Okayama 700-8530, Japan.
Biosensors
|January 27, 2026
Summary
This study introduces magnetic nanoparticles (MNPs) modified with tumor-homing peptides (THPs) for rapid, label-free cancer cell detection. The THP-MNPs show selective binding to cancer cells, enabling sensitive detection via magnetic signal changes.
Area of Science:
- Biotechnology
- Nanotechnology
- Medical Diagnostics
Background:
- Magnetic nanoparticles (MNPs) offer unique magnetic properties for biosensing applications.
- Targeted delivery of MNPs using specific ligands enhances detection sensitivity.
- Cancer detection methods require improved specificity and speed.
Purpose of the Study:
- To develop and evaluate magnetic nanoparticles functionalized with tumor-homing peptides (THPs) for selective cancer cell detection.
- To assess the performance of THP-MNPs using SQUID magnetometry under alternating magnetic fields (AMFs).
- To demonstrate a label-free method for distinguishing malignant from non-malignant cells.
Main Methods:
- Synthesis and characterization of THP-MNPs using transmission electron microscopy.
- Incubation of THP-MNPs with human glioblastoma (U87MG) and normal (HEK293) cells.
- Measurement of magnetic signals using a superconducting quantum interference device (SQUID) magnetometer under AMF.
- Confirmation of cell binding using dark-field microscopy.
Main Results:
- THP-MNPs demonstrated preferential binding to U87MG cancer cells compared to HEK293 cells.
- AMF-induced magnetic signal enhancement of THP-MNPs was suppressed in the presence of U87MG cells, indicating specific binding.
- PL3-modified MNPs showed superior discrimination between malignant and non-malignant cells.
- Particle size reduction due to THP release correlated with signal enhancement in the absence of cells.
Conclusions:
- SQUID-based magnetic measurements with THP-MNPs enable rapid and label-free detection of cancer cells.
- THP-functionalized MNPs offer a promising platform for targeted cancer diagnostics.
- The developed method shows potential for improved specificity in distinguishing cancer cells.
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