Oregon State Researchers Develop Gold Nanoparticles for Safe Low-Power Melanoma Therapy
核心洞察
Oregon State University researchers have developed gold nanorods (搜索) coated with iron-cobalt shells that enable complete melanoma (搜索) tumor ablation using laser power below skin safety thresholds.
The nanoparticles utilize resonance energy transfer to heat up efficiently at 0.25 W/cm², well below the 0.33 W/cm² safety limit, achieving complete tumor destruction in aggressive melanoma (搜索) mouse models.
The theranostic platform combines treatment and diagnostic capabilities, functioning as both a photothermal therapy agent and fluorescence imaging guide for precise tumor targeting.
Oregon State University researchers have achieved a significant breakthrough in melanoma (搜索) treatment by developing gold nanoparticles that can completely destroy tumors using low-power laser therapy that remains within safe limits for human skin. The innovation addresses a critical limitation that has hindered the clinical application of photothermal therapy for treating the deadliest form of skin cancer (搜索).
The research team, led by Olena Taratula, associate professor of pharmaceutical sciences, and postdoctoral researcher Prem Singh at the Oregon State University College of Pharmacy, demonstrated complete tumor ablation in aggressive melanoma (搜索) mouse models using laser power densities of just 0.25 watts per centimeter squared—well below the 0.33 W/cm² safety threshold for skin tissue.
Novel Nanoparticle Design Enables Safe Treatment
The theranostic platform is based on gold nanorods (搜索) coated with an iron-cobalt shell and loaded with a specialized dye that generates heat when exposed to near-infrared light. This invisible, low-frequency radiation can penetrate deeply into human tissue while remaining safe for clinical use.
"When we used 0.25 watts per centimeter squared with our nanoparticles, a single treatment of an aggressive melanoma (搜索) mouse model, developed in the lab of our OSU colleague Adam Alani, completely ablated the tumor," Taratula explained.
The key innovation lies in the platform's use of resonance energy transfer, a nanoscale process that enables direct energy movement between neighboring molecules. This highly efficient mechanism allows the nanoparticles to heat up rapidly under laser exposure at power levels far below conventional safety thresholds.
Addressing Critical Medical Need
Melanoma (搜索) represents a significant clinical challenge, accounting for only about 1% of skin cancers but responsible for the majority of skin cancer (搜索) deaths. According to the National Institutes of Health, more than 8,000 people in the United States died of melanoma in 2025, with over 100,000 new cases diagnosed.
Current treatment approaches often require extensive surgical procedures. "Many of those cases likely were treated with a surgical procedure that required a big incision and a significant amount of tissue removal to help ensure no cancerous cells were left behind," Singh noted. "Photothermal therapy on the other hand is a minimally invasive treatment, and our work establishes resonance energy transfer as a truly transformative strategy for coming up with next-generation photothermal therapy agents."
Dual-Function Platform Enhances Precision
Beyond its therapeutic capabilities, the nanoparticle platform serves as both a treatment and diagnostic tool. The design enables fluorescence-guided ablation therapy, where an imaging system indicates precisely where to direct the laser during tumor removal. This dual functionality enhances treatment precision while minimizing damage to surrounding healthy tissue.
After systemic administration, the nanoparticles accumulate specifically in cancerous tissue before activation with near-infrared light. This targeted approach ensures that only melanoma (搜索) cells are destroyed while leaving healthy tissue unharmed.
Research Foundation and Future Implications
The study, published in Advanced Functional Materials, represents collaborative efforts supported by the OSU College of Pharmacy, the OSU Advantage program, the National Cancer Institute of the National Institutes of Health, and the Eunice Kennedy Shriver National Institute of Child Health and Human Development.
The research involved extensive collaboration including Oregon State's Constanze Raitmayr, Syed Zaki Husain Rizvi, Ammar Salem, Vladislav Grigoriev, Tetiana Korzun, Karthickraja Duraisamy, Akshay Vyawahare, Kongbrailatpam Shitaljit Sharma, Ana Paula Mesquita Souza, Yoon Tae Goo, Manali Phawde, Chrissa Kioussi and Oleh Taratula, along with Yitayal Admassu Workie of Addis Ababa Science and Technology University.
This breakthrough establishes a foundation for developing safer, more effective photothermal therapy approaches that could transform melanoma (搜索) treatment by offering patients a minimally invasive alternative to traditional surgical interventions.