Harnessing gold nanorods and light for targeted cancer therapy

Researchers at the Indian Institute of Technology Gandhinagar (IITGN) have developed a gold nanorod-based platform that selectively delivers chemotherapy drugs to cancer cells while generating heat when exposed to near-infrared light. This innovative approach, known as ER-targeted chemo-photothermal therapy, aims to destroy cancer cells without harming healthy ones.

The gold nanorods used in the study are functionalized with a chemotherapy drug called cisplatin, another drug called indomethacin, and a molecule called dansyl-sulfonamide. The dansyl-sulfonamide helps direct the nanorods toward the endoplasmic reticulum (ER), a cellular structure responsible for protein production and processing. When exposed to near-infrared light, the nanorods convert the light into heat, causing damage to cancer cells.

In their study, published in the journal Journal of Materials Chemistry B, the team demonstrated that these nanorods rapidly accumulate within the ER of cancer cells, overwhelming the cells' protein-processing machinery and inducing ER stress. Additionally, light irradiation further increased the generation of reactive oxygen species (ROS), which can cause oxidative stress and cellular damage.

This combined stress triggers a cascade of cellular responses, leading to autophagy (cell recycling of damaged components) and apoptosis (controlled cell death).

The researchers tested the ER-targeted nanorods in various cancer cell lines, including colon, cervical, and breast cancer cells. They found that the nanorods effectively reduced cell viability while showing negligible toxicity towards noncancerous cells under the experimental conditions.

While the study shows promising results in laboratory-based cell studies, further research is needed to determine the safety, efficacy, and translational potential of this approach in living organisms. The team emphasizes that the study highlights the importance of designing nanoscale materials that can perform multiple therapeutic functions within a single platform, offering a promising direction for more precise and sophisticated cancer treatments.