Scientists at RMIT University have created tiny molybdenum oxide nanodots that destroy cancer cells by amplifying their internal stress, while leaving healthy cells largely intact. In lab tests, these particles proved three times more effective against cervical cancer cells than healthy ones. The early-stage research points to a potential for more precise cancer treatments.
A team led by Professor Jian Zhen Ou and Dr. Baoyue Zhang at RMIT University's School of Engineering has engineered ultrathin nanodots from molybdenum oxide, a metal compound typically used in electronics and alloys. By fine-tuning the particles' chemical structure with small additions of hydrogen and ammonium, the researchers enabled them to generate reactive oxygen species. These unstable molecules damage essential cell components, pushing cancer cells toward apoptosis, the body's programmed cell death mechanism.
Laboratory experiments demonstrated the nanodots' selectivity. Over 24 hours, they eliminated cervical cancer cells at three times the rate of healthy cells, without needing light activation—a departure from many similar technologies. In another test, the particles degraded a blue dye by 90 percent in just 20 minutes, even in darkness, highlighting their potent chemical reactivity.
"Cancer cells already live under higher stress than healthy ones," Zhang explained. "Our particles push that stress a little further—enough to trigger self-destruction in cancer cells, while healthy cells cope just fine."
The project drew on international expertise, including contributions from Dr. Shwathy Ramesan at The Florey Institute of Neuroscience and Mental Health in Melbourne, as well as researchers from Southeast University, Hong Kong Baptist University, and Xidian University in China. Funding came from the ARC Centre of Excellence in Optical Microcombs (COMBS).
While promising, the technology remains in preliminary lab testing with cell cultures only; no animal or human trials have occurred. Future efforts focus on tumor-specific delivery systems, controlled release of reactive oxygen, and collaborations for advanced testing and manufacturing. Using a common, non-toxic metal oxide, the nanodots could offer a cost-effective alternative to treatments relying on expensive noble metals like gold or silver, potentially reducing side effects from collateral damage to healthy tissues.
