How does a small group of cells organize to become a heart, a brain, or a kidney? This critical period of development has long remained the black box of developmental biology, in part because no sensor was small or flexible enough to observe this process without damaging the cells.
Now, researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have grown simplified organs known as organoids with fully integrated sensors. These so-called cyborg organoids offer a rare glimpse into the early stages of organ development.
The research was published in Nano Letters.
“I was so inspired by the natural organ development process in high school — the way 3D organs start from few cells in 2D structures. I thought that if we could develop nanoelectronics that are so flexible, stretchable, and soft that they could grow together with developing tissue through their natural development process, the embedded sensors could measure the entire activity of this developmental process,” said Jia Liu, assistant professor of bioengineering at SEAS and senior author of the study. “The end result is a piece of tissue with a nanoscale device completely distributed and integrated across the entire 3D volume of the tissue.”
This type of device emerges from the work that Liu began as a graduate student in the lab of Charles M. Lieber, the Joshua and Beth Friedman University Professor. In Lieber’s lab, Liu once developed flexible, mesh-like nanoelectronics that could be injected in specific regions of tissue.
Building on that design, Liu and his team increased the stretchability of the nanoelectronics by changing the shape of the mesh from straight lines to serpentine structures (similar to those used in wearable electronics). Then, the team transferred the mesh nanoelectronics onto a 2D sheet of stem cells, where the cells covered and interwove with the nanoelectronics via cell-cell attraction forces. As the stem cells began to morph into a 3D structure, the nanoelectronics seamlessly reconfigured themselves accordingly, resulting in fully grown 3D organoids with embedded sensors.
The stem cells then differentiated into cardiomyocytes — heart cells — and the researchers were able to monitor and record the electrophysiological activity for 90 days.