Texas A&M Scientists Create "OFF Switch" for Engineered Cells Using Caffeine and AI
A team at the Texas A&M Health Institute of Biosciences and Technology has developed a novel molecular switch that uses caffeine to control engineered cells. The new system, termed the caffeine-operated dissociation system (CODS), functions as an "OFF switch" by separating proteins inside living cells in response to the stimulant.
"AI allows us to design new mini proteins with specific behaviors, and CODS uses caffeine as a precise trigger." — Yubin Zhou, Lead Researcher
How the System Works
Built using AI-guided protein design and high-performance computing, CODS represents a departure from previous caffeine-responsive technologies. While older systems were designed to bring proteins together, CODS is unique in that it forces them apart.
The researchers created synthetic binders using protein-design algorithms and molecular simulations, refining them before testing in living cells. The system is designed to enable safer, more controllable gene and cell therapies.
Demonstrated Capabilities
The research, published in the Journal of the American Chemical Society and led by Yubin Zhou, Tianlu Wang, and colleagues, showcased three key demonstrations:
-
Gene Activity Control: CODS significantly reduced gene activity when caffeine was introduced. The system proved reversible, with gene activity recovering once the caffeine was removed.
-
Programmed Cell Death: The team successfully used CODS to trigger pyroptosis, a controlled and inflammatory form of cell death, demonstrating precise cellular control.
-
CAR T-Cell Regulation: In laboratory tests, CODS reduced CAR T-cell activation in the presence of caffeine. This finding suggests the technology could serve as a potential safety switch for immune cell therapies.
A "Brake" for Engineered Therapies
Tianlu Wang described the system's function in practical terms, noting that CODS acts as a "brake or pause button" for engineered cells. Importantly, researchers clarified that caffeine itself is not the therapeutic agent.
"Caffeine itself is not a cancer treatment, but a signal for controlling engineered cells." — Yubin Zhou
Looking Ahead
The study represents a significant advance in programmable medicine, leveraging AI-designed proteins alongside a familiar small molecule to control cellular responses. The research team plans to continue development by testing CODS in therapeutic cells, animal models, and disease-relevant conditions.