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Special Physics Colloquium
“Nanoparticle Based Photodynamic Therapy and Photothermal Therapy For Cancer Treatment” by Wei Chen, Nano-Bio Physics, Department of Physics, University of Texas at Arlington, Texas

Cancer is a class of diseases in which a group of cells display uncontrolled growth. Every year, about 562,340 Americans are expected to die of cancer, more than 1,500 people a day. Cancer is the second most common cause of death in the US, exceeded only by heart disease. In the US, cancer accounts for nearly 1 of every 4 deaths. Early detection and effective treatment are the best hope for cancer patients. Photodynamic therapy (PDT) is a promising recipe for cancer treatment. However, the difficulty of light penetration into deep tissue has hitherto prevented the application of photodynamic therapy for deep cancer treatment. The three components that are required for PDT are oxygen, photosensitizers, and light. To solve the problem of light penetration and to enhance the PDT treatment for deep cancers, I have proposed a new PDT system in which the light is provided by afterglow nanoparticles with attached photosensitizers. When the nanoparticle-photosensitizer conjugates are targeted to tumor and stimulated by X-ray during radiotherapy, the particles will generate light to activate the photosensitizers for photodynamic therapy. Therefore, the radiation and photodynamic therapies are combined and occur simultaneously, and the tumor destruction will be more efficient. More importantly, it can be used for deep tumor treatment as X-ray can penetrate deep into the tissue such as Breast and prostate cancers. This novel modality is called nanoparticle self-lighting photodynamic therapy (NSLPDT). In this presentation, I will report the progress of the research in my group on the design, synthesis and evaluation of nanoparticle conjugates for photodynamic therapy.
Along with PDT, PTT (Photothermal Therapy) is also an effective method for cancer treatment. In our innovative studies, we investigated the potential of CuS nanoparticles for PTT. CuS nanoparticles have optical absorption band in the NIR range with a maximum at 900 nm. Irradiation by a NIR laser beam at 808 nm, the temperature in CuS nanoparticle aqueous solution is increased as a function of exposure time and nanoparticle concentration. CuS nanoparticles induced photothermal destruction of HeLa cells in a laser dose- and nanoparticle concentration-dependent manner, and displayed minimal cytotoxic effects with a profile similar to that of gold nanoparticles. Owing to their unique optical property, small size, low cost of production, and low cytotoxicity, CuS nanoparticles are promising new nanomaterials for cancer photothermal ablation therapy.
In the last part of my presentation, I will briefly introduce my work on drug delivery and targeting and my research projects on radiation detection for homeland security.
Refreshments at 3:00 in Science 103

Joyce Norton



Event Information
Time: 3:30 PM - 4:30 PM
Event Date: 10/14/2011

Science Bldg., Room 10