Custom-designed Laser-based Heating Apparatus for Triggered Release of Cisplatin from Thermosensitive Liposomes with Magnetic Resonance Image Guidance

作者： Yannan N. Dou1, Robert A. Weersink2,5, Warren D. Foltz5,6, Jinzi Zheng5,6, Naz Chaudary7, David A. Jaffray2,3,4,5,6, Christine Allen1 1Leslie Dan Faculty of Pharmacy,University of Toronto, 2Department of Radiation Oncology,University of Toronto, 3Medical Biophysics,University of Toronto, 4Institute of Biomaterials & Biomedical Engineering,University of Toronto, 5Techna Institute and Radiation Medicine Program, Princess Margaret Cancer Center,University Health Network, 6STTARR Innovation Center,University Health Network, 7Ontario Cancer Institute,University Health Network

简介：

Overview

This study demonstrates a custom-built, MRI-compatible laser-based heating apparatus designed for local heating of subcutaneous tumors. The apparatus activates the release of agents from thermosensitive liposomes specifically at the tumor site.

Key Study Components

Area of Science

• Neuroscience
• Oncology
• Biomedical Engineering

Background

• Local heating can enhance the effectiveness of drug delivery systems.
• Thermosensitive liposomes release their contents at elevated temperatures.
• Magnetic Resonance Imaging (MRI) compatibility allows for real-time monitoring.
• Subcutaneous tumors present a challenge for targeted therapies.

Purpose of Study

• To develop a laser-based system for localized tumor heating.
• To facilitate the release of therapeutic agents from liposomes at the tumor site.
• To demonstrate the feasibility of using MRI for monitoring temperature changes during treatment.

Methods Used

• Preparation of the heat-activated liposome formulation.
• Inoculation of donor mice with cervical carcinoma cells.
• Implantation of tumor fragments into recipient mice.
• Application of laser heating to achieve targeted temperatures.

Main Results

• The laser-based heating apparatus effectively raised tumor temperatures to 42 degrees Celsius.
• Real-time monitoring of tissue temperature was achieved using MRI.
• Localized heating resulted in the successful activation of liposome drug release.
• The system proved to be portable and user-friendly for small animal studies.

Conclusions

• The custom laser-based heating apparatus is a promising tool for enhancing localized cancer therapies.
• Real-time monitoring via MRI provides valuable feedback during treatment.
• This approach may improve the efficacy of thermosensitive liposome formulations in clinical applications.

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