University of Tokyo Scientists Engineer First Photosynthetic Animal Cells to Power Growth and Oxygen Production

University of Tokyo researchers successfully engineered animal cells to perform photosynthesis, a breakthrough for lab-grown meat and heart disease treatments.

By: AXL Media

Published: May 1, 2026, 11:37 AM EDT

Source: Information for this report was sourced from Earth.com

Breaking a Half-Century Biological Deadlock

The quest to bridge the gap between plant and animal biology has reached a historic milestone at the University of Tokyo. For over five decades, the scientific community largely abandoned the idea of "photosynthetic animals" after repeated attempts in the 1970s failed to prevent animal cells from destroying chloroplasts as foreign invaders. Professor Sachihiro Matsunaga’s team has now successfully bypassed this cellular immune response, proving that animal cells can not only host these structures but also utilize the energy they produce. This achievement fundamentally redefines the boundaries of biological engineering and opens the door to creating hybrid cells that consume less sugar and emit less carbon dioxide.

Thermal Adaptation and the "Food" Protocol

Two critical hurdles were cleared to make this discovery possible. First, the researchers had to identify chloroplasts capable of remaining stable at 37 degrees Celsius, the standard temperature for animal cell cultures, which is significantly warmer than most plant environments. Once a suitable candidate was found, the team altered their delivery method. Instead of forcibly injecting the structures, they allowed the animal cells to ingest the chloroplasts naturally as "food." This subtle tactical shift prevented the cells from triggering a defensive response, allowing the chloroplasts to remain functional and detectable for at least two days within their new hosts.

Surprising Gains in Cellular Growth Rates

The initial observations of the hybrid cells provided immediate evidence of the benefits of this integration. Beyond simply tolerating the chloroplasts, the animal cells showed a marked increase in their rate of division and growth. This suggests that the glucose and oxygen generated through the initial reactions of photosynthesis provided a supplemental energy source that boosted cellular productivity. Matsunaga noted that this result was unexpected, as it demonstrated that a process once thought to be exclusive to the botanical world could be successfully harnessed to fuel animal life at the microscopic level.