Building on recent advances in marine biomechanics, materials science, and tissue engineering, a team of researchers at Harvard University and the California Institute of Technology (Caltech) has turned inanimate silicon and living cardiac muscle cells into a freely swimming “jellyfish.”
The development serves as a proof of concept for reverse engineering a variety of muscular organs and simple life forms. It also suggests a broader definition of what counts as synthetic life in an emerging field that has primarily focused on replicating life’s building blocks.
The researchers’ method for building the tissue-engineered “jellyfish,” dubbed “Medusoid,” was published in Nature Biotechnology on July 22.
An authority on cell- and tissue-powered actuators, co-author Kevin Kit Parker previously demonstrated that bioengineered constructs can grip, pump, and even walk. The inspiration to raise the bar and mimic a jellyfish came out of Parker’s frustration with the state of the cardiac field.
Akin to how a human heart moves blood throughout the body, jellyfish propel themselves through the water by pumping. The researchers, in figuring out how to take apart and then rebuild the primary motor function of a jellyfish, worked to gain new insights into how such pumps work.
“It occurred to me in 2007 that we might have failed to understand the fundamental laws of muscular pumps,” said Parker, Tarr Family Professor of Bioengineering and Applied Physics at the Harvard School of Engineering and Applied Sciences (SEAS) and a core faculty member at the Wyss Institute for Biologically Inspired Engineering at Harvard. “I started looking at marine organisms that pump to survive. Then I saw a jellyfish at the New England Aquarium, and I immediately noted both similarities and differences between how the jellyfish and the human heart pump.”
To build the Medusoid, Parker collaborated with Janna Nawroth, a doctoral student in biology at Caltech and lead author of the study, who performed the work as a visiting researcher in Parker’s lab. They also worked with Nawroth’s adviser, John Dabiri, a professor of aeronautics and bioengineering at Caltech, who is an authority on biological propulsion.
“A big goal of our study was to advance tissue engineering,” said Nawroth. “In many ways, it is still a very qualitative art, with people trying to copy a tissue or organ just based on what they think is important or what they see as the major components — without necessarily understanding if those components are relevant to the desired function, or without analyzing first how different materials could be used.”
It turned out that jellyfish, believed to be the oldest multi-organ animals in the world, were an ideal subject, as they use muscles to pump their way through the water, and their basic morphology is similar to that of a beating human heart.
To reverse engineer a “Medusa” jellyfish, the investigators used analytical tools borrowed from the fields of law enforcement biometrics and crystallography to make maps of the alignment of subcellular protein networks in all of the animal’s muscle cells. They then conducted studies to understand the electrophysiological triggering of the jellyfish propulsion and the biomechanics of the propulsive stroke itself.
Based on those efforts, it turned out that a sheet of cultured rat heart muscle tissue that would contract when electrically stimulated in a liquid environment was the perfect raw material to create an ersatz jellyfish. The team then incorporated a silicone polymer that fashions the body of the artificial creature into a thin membrane that resembles a small jellyfish, with eight armlike appendages.
Using the same analytical tools, the investigators were able to quantitatively match the subcellular, cellular, and supracellular architecture of the jellyfish musculature with the rat heart muscle cells.
The artificial construct was placed in a container of oceanlike saltwater and shocked into swimming with synchronized muscle contractions that mimic those of real jellyfish. (In fact, the muscle cells started to contract a bit on their own even before the electrical current was applied.)
“I was surprised that with relatively few components — a silicone base and cells that we arranged — we were able to reproduce some pretty complex swimming and feeding behaviors that you see in biological jellyfish,” said Dabiri.
The researchers’ design strategy, they say, will be broadly applicable to the reverse engineering of muscular organs in humans.
“As engineers, we are very comfortable with building things out of steel, copper, concrete,” said Parker. “I think of cells as another kind of building substrate, but we need rigorous quantitative design specs to move tissue engineering to a reproducible type of engineering. The jellyfish provides a design algorithm for reverse engineering an organ’s function and developing quantitative design and performance specifications. We can complete the full exercise of the engineer’s design process: design, build, and test.”
In addition to the tissue engineering, Parker said he took on the challenge of building a creature to test the traditional view of synthetic biology that is “focused on genetic manipulations of cells.” Instead of building just a cell, he wanted to “build a beast.”
Looking forward, the researchers aim to evolve the artificial jellyfish, allowing it to turn and move in a particular direction, and even incorporating a simple “brain” so it can respond to its environment and replicate more-advanced behaviors like heading toward a light source and seeking energy or food.
Along with Parker, Nawroth, and Dabiri, contributors to the study included Hyungsuk Lee, Adam W. Feinberg, Crystal M. Ripplinger, Megan L. McCain, and Anna Grosberg, all at Harvard. Funding for the study included grants from the Wyss Institute for Biologically Inspired Engineering at Harvard, the National Science Foundation (NSF), the National Institutes of Health, the Office of Naval Research, and the NSF Program in Fluid Dynamics.