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Thermal Scanning at the Cellular Level by an Optically Trapped Upconverting Fluorescent Particle
Paloma Rodríguez-Sevilla1,2, Yuhai Zhang3, Patricia Haro-González1,2
1Fluorescence Imaging Group, Departamento de Física de Materiales, Facultad de Ciencias, Universidad Autonoma de Madrid, Madrid, 28049, Spain.
Advanced Materials (Deerfield Beach, Fla.)
|January 30, 2016
Summary
Researchers used 3D optical manipulation to precisely measure the thermal gradient around a cancer cell treated with photothermal therapy. This technique helps understand heat distribution in targeted cancer treatments.
Area of Science:
- Biophysics
- Optical Physics
- Cancer Research
Background:
- Photothermal therapy (PTT) utilizes localized heating to treat cancer.
- Understanding the precise thermal distribution around treated cells is crucial for optimizing PTT efficacy and minimizing off-target effects.
- Optical manipulation offers a precise tool for investigating nanoscale thermal phenomena.
Purpose of the Study:
- To develop and demonstrate a method for quantifying the thermal gradient generated by PTT in the microenvironment of a single cancer cell.
- To utilize a thermal-sensing upconverting particle (UP) for precise temperature mapping.
- To investigate the spatial extent of thermal effects around a PTT-treated HeLa cancer cell.
Main Methods:
- Employing 3D optical tweezers to trap and manipulate a thermal-sensing upconverting particle.
- Utilizing the temperature-dependent luminescence of the upconverting particle to sense local temperature.
- Inducing photothermal effects in a HeLa cancer cell using plasmonic nanoparticles and laser irradiation.
- Mapping the temperature distribution by moving the upconverting particle through the cell's surroundings.
Main Results:
- Successfully demonstrated 3D optical manipulation of the thermal-sensing upconverting particle.
- Quantified the spatial extension of the thermal gradient generated around the photothermal-treated HeLa cancer cell.
- Provided a detailed map of the temperature distribution in the cell's microenvironment.
Conclusions:
- 3D optical manipulation of thermal-sensing upconverting particles is an effective technique for characterizing thermal gradients in biological systems.
- The findings provide critical insights into the thermal dynamics of photothermal therapy at the cellular level.
- This methodology can be applied to optimize PTT parameters and improve cancer treatment strategies.
