Living devices may selectively kill cancer cells without disrupting healthy cells.

Building ‘Smart’ Cell-Based Therapies

A Northwestern synthetic biology team has created a new technology for modifying human cells to create programmable therapeutics that could travel the body and selectively target cancer and other sites of disease.

Engineering cell-based, biological devices that monitor and modify human physiology is a promising frontier in clinical synthetic biology. However, no existing technology enabled bioengineers to build such devices that sense a patient’s physiological state and respond in a customized fashion.

“The project addressed a key gap in the synthetic biology toolbox,” says Joshua Leonard, assistant professor of chemical and biological engineering in Northwestern’s McCormick School of Engineering and Applied Science. “There was no way to engineer cells in a manner that allowed them to sense key pieces of information about their environment, which could indicate whether the engineered cell is in healthy tissue or sitting next to a tumor.”

Funded by the National Academies Keck Futures Initiative and the Defense Advanced Research Projects Agency, the research is available to read online in the journal ACS Synthetic Biology.

Leonard’s team worked for nearly four years to close this gap. The end result is a protein biosensor that sits on the surface of a cell and can be programmed to sense specific external factors. For example, the engineered cell could detect big, soluble protein molecules that indicate that it’s next to a tumor. When the biosensor detects such a factor, it sends a signal into the engineered cell’s nucleus to activate a gene expression program, such as the production of tumor-killing proteins or chemicals. Since this toxic program would be activated only near tumor cells, such an approach could minimize side effects as well as improve therapeutic benefits.

Called a Modular Extracellular Sensor Architecture (MESA), the biosensor platform is completely self-contained so that several different biosensors can be present in a single cell without interfering with one another, allowing bioengineers to build increasingly sophisticated functional programs. The platform is also highly modular, enabling the biosensors to be customized to recognize factors of relevance to various patients’ needs.

“By linking the output of these biosensors to genetic programs, one can build in a certain logical command, such as ‘turn the output gene on when you sense this factor but not that factor,’” Leonard explains. “In that way, you could program a cell-based therapy to specify which cells it should kill.”

Leonard says doctors could potentially collect immune cells from a patient’s body, engineer the cells using MESA, and put them back into the patient. From there, the cells would do the work of detecting cancer or the disease they are designed to identify.

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