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Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
Stahl et al. discovered exosomes in 1983, but the exosomes were initially considered waste products released from the...

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Updated: Aug 2, 2025

Using Nanoplasmon-Enhanced Scattering and Low-Magnification Microscope Imaging to Quantify Tumor-Derived Exosomes

Using Nanoplasmon-Enhanced Scattering and Low-Magnification Microscope Imaging to Quantify Tumor-Derived Exosomes

Published on: May 24, 2019

3D Plasmonic Nanostructure-Based Polarized ECL Sensor for Exosome Detection in Tumor Microenvironment.

Peilin Wang¹, Huixin Li², Yixin Nie¹

¹Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun 130012, China.

|April 19, 2023

Summary

A novel 3D plasmonic nanostructure enhances electrochemiluminescence (ECL) for sensitive exosomal microRNA detection. This breakthrough offers improved accuracy for diagnosing neoplasms and understanding tumor microenvironments.

Keywords:

3D plasmonic nanostructure electrochemiluminescence exosomal miRNA surface plasmon coupling tumor microenvironment

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Area of Science:

Nanotechnology
Biomedical Engineering
Analytical Chemistry

Background:

Exosomes from cancer cells are crucial in tumor progression (proliferation, adhesion, migration).
Tumor microenvironment exosomes serve as ideal markers for neoplasm malignancy potential and grade.
Sensitive and accurate exosome detection remains a significant challenge in diagnostics.

Purpose of the Study:

To develop a novel three-dimensional (3D) plasmonic nanostructure for enhanced exosomal microRNA (miRNA) detection.
To improve the sensitivity and accuracy of exosome detection for clinical diagnosis.
To investigate the potential of this sensor in analyzing the tumor microenvironment.

Main Methods:

Construction of a 3D plasmonic nanostructure combining Au nanostar and Ag nanowire monolayers.
Utilizing the nanostructure to create multiple hot spots and guide polarized electrochemiluminescence (ECL) emission.
Application of the sensor for detecting exosomal miRNA-146b-5p in thyroid tumor microenvironments.

Main Results:

The 3D plasmonic nanostructure significantly improved polarized ECL signal intensity by 47.1 times.
The developed sensor demonstrated a wide linear range (1 fM to 1 nM) for exosomal miRNA detection.
Achieved a highly sensitive detection limit of 0.3 fM for exosomal miRNA-146b-5p.

Conclusions:

The novel 3D plasmonic nanostructure-based ECL sensor offers enhanced performance for exosomal miRNA detection.
This technology shows great potential for sensitive and accurate biosensing and clinical diagnosis.
The sensor provides a valuable tool for analyzing biomarkers within the tumor microenvironment.