Nanorobots with Hidden Weapon Successfully Target Cancer Cells in Mice

Researchers at the Karolinska Institutet in Sweden have developed innovative nanorobots capable of selectively killing cancer cells in mice. This study, published in Nature Nanotechnology, demonstrates a novel approach to cancer treatment using DNA origami technology.

The nanorobots contain a hidden weapon—a hexagonal nanopattern of peptides that can organize death receptors on cell surfaces, leading to cell death. Professor Björn Högberg, who led the study, explains, "This hexagonal nanopattern of peptides becomes a lethal weapon". To prevent indiscriminate cell killing, the researchers concealed this weapon within a DNA nanostructure.

The key innovation is a 'kill switch' that activates only in the acidic microenvironment typically surrounding cancer cells. Högberg states, "We have managed to hide the weapon in such a way that it can only be exposed in the environment found in and around a solid tumor". This specificity allows the nanorobots to target cancer cells while sparing healthy ones.

In laboratory tests, the peptide weapon remained hidden at normal pH (7.4) but showed a drastic cell-killing effect when the pH dropped to 6.5. When injected into mice with breast cancer tumors, the nanorobots reduced tumor growth by 70% compared to controls.

Yang Wang, the study's first author, emphasizes the need for further research: "We now need to investigate whether this works in more advanced cancer models that more closely resemble the real human disease". The team also plans to explore ways to make the nanorobots even more targeted by adding cancer-specific binding proteins or peptides to their surface.