Building 'smart' cell-based therapies

Leonard and his team have developed a technology for engineering human cell-based 'devices' that monitor and modify human physiology. This technology is a protein biosensor that sits on the surface of a cell, can be programmed to sense specific external factors, and upon detecting these factors sends a signal into the engineered cell’s nucleus to activate a gene expression program.

A Northwestern University 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 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.

This is the first completely ground-up engineering of a receptor, and now that the core technology has been established, Leonard's team is moving forward to program to recognize specific tumor-associated factors. They are also looking toward applications beyond advanced cell-based therapies.

"This seems to be what always happens in ," he says. "When you start building something, you first learn a lot about the system that you are trying to modify. In the end, you come up with not only useful applications but tools that facilitate basic science."

More information: pubs.acs.org/doi/abs/10.1021/sb400128g

add to favorites email to friend print save as pdf

Related Stories

Synthetic gene circuits pump up cell signals

Apr 08, 2014

(Phys.org) —Synthetic genetic circuitry created by researchers at Rice University is helping them see, for the first time, how to regulate cell mechanisms that degrade the misfolded proteins implicated ...

Recommended for you

Growing a blood vessel in a week

14 hours ago

The technology for creating new tissues from stem cells has taken a giant leap forward. Three tablespoons of blood are all that is needed to grow a brand new blood vessel in just seven days. This is shown ...

Testing time for stem cells

17 hours ago

DefiniGEN is one of the first commercial opportunities to arise from Cambridge's expertise in stem cell research. Here, we look at some of the fundamental research that enables it to supply liver and pancreatic ...

Team finds key signaling pathway in cause of preeclampsia

Oct 23, 2014

A team of researchers led by a Wayne State University School of Medicine associate professor of obstetrics and gynecology has published findings that provide novel insight into the cause of preeclampsia, the leading cause ...

Rapid test to diagnose severe sepsis

Oct 23, 2014

A new test, developed by University of British Columbia researchers, could help physicians predict within an hour if a patient will develop severe sepsis so they can begin treatment immediately.

User comments