DNA robots attack cancer cells
From the BBC by Jason Palmer:
The barrel shape opens and spills its payload when the “locks” come into contact with target cells
Scientists have developed and tested a “DNA robot” that delivers payloads such as drug molecules to specific cells.
The container was made using a method called “DNA origami”, in which long DNA chains are folded in a prescribed way.
Then, so-called aptamers – which can recognise specific cell types – were used to lock the barrel-shaped robot.
In lab tests described in Science, the locks opened on contact with cancer cell proteins, releasing antibodies that halted the cells’ growth.
The method could find wide use in biological applications, where this kind of “specificity” is highly prized.
Lead author of the research, Shawn Douglas of the Wyss Institute at Harvard University, said the result brings together several recent research strands.
“We’ve been working on figuring out how to build different shapes using DNA over the past several years, and other researchers have used antibodies as therapeutics, in order to manipulate cell signalling, and yet others have demonstrated that aptamers can be used to target cancer cell types,” Dr Douglas told BBC News.
“The novel part is really integrating all those different pieces and putting them together in a single device that works.”
In essence, the approach co-opts a number of strategies of our immune systems, with the robots playing the role of white blood cells that hunt down problematic cells and destroy them.
The team tested the robots using several cultures of cancer cells including lymphoma and leukemia, with corresponding payloads of antibodies.