Dr. Gang Zheng
TORONTO, Canada – July, 14, 2016 – Dr. Gang Zheng and a team of biomedical researchers have discovered a “smart” organic, biodegradable nanoparticle that uses heat and light in a controlled manner to potentially target and ablate tumours with greater precision.
The proof-of-concept findings, published online today and designated a “very important paper” in the leading chemistry journal Angewandte Chemie, provide a viable approach to boosting the clinical utility of photo-thermal therapy in treating cancer, says Dr. Zheng, senior scientist at the Princess Margaret Cancer Centre and professor of medical biophysics at the University of Toronto. Dr. Zheng also holds the Joey and Toby Tanenbaum/Brazilian Ball Chair in Prostate Cancer Research. He talks about and demonstrates the research at https://youtu.be/EEN6Mz5iWBI.
In the lab, using phantom models, the “smart” nanoparticle the team has dubbed PEARLs – photo-thermal enhancing auto-regulating liposomes – showed how it can solve the two bottlenecks currently preventing more effective use of photo-thermal therapy with patients. These are overheating of tissue that can cause collateral damage during treatment, and the inability to ablate larger tumour volumes because the light stops travelling when it is absorbed.
Explains the chemist: “Our smart nanoparticle is super cool. It can absorb light, generate heat and ablate the tumour. It’s a thermal sensor and once it reaches the desired ablation temperature of 55C, it becomes invisible, allowing the light to move deeper into more areas of the tumour and repeat the treatment process.
“The result is a promising new way to heat and ablate larger volumes of the tumour with minimal damage to surrounding tissues in a controlled and precise way. The next step is to conduct pre-clinical studies to test the concept further.”
For the past 10 years at PMCC, Dr. Zheng’s research has focused on advancing nanoparticle technology by harnessing light, heat and sound to advance tumour imaging and targeted treatment.
Study: Controlling Spatial Heat and Light Distribution by Using Photothermal Enhancing Auto-Regulated Liposomes (PEARLs)
Authors: Kenneth K Ng. Robert A. Weersink, Liang Lim, Brian C. Wilson, Gang Zheng
Funding: The research was funded by the Terry Fox Research Institute, Prostate Cancer Canada, the Canadian Institutes of Health Research, Ontario Institute for Cancer Research, the Natural Sciences and Engineering Research Council of Canada, the Canada Foundation for Innovation, the Tanenbaum Chair in Prostate Cancer Research, and The Princess Margaret Cancer Foundation.
TFRI Links, Fall 2016