Bullfrog brains have a hidden superpower

Scientists have discovered an unexpected ability in bullfrog brains that could have significant implications for human health. For years, researchers believed that most animals, including humans, relied on glucose as the primary fuel for their brains. However, a team at the University of Missouri has found that bullfrogs can produce their own emergency energy source called ketone bodies when glucose becomes scarce.

This discovery challenges the long-held belief that ketone bodies are primarily produced in the liver during periods of low glucose, such as fasting or exercise. Instead, bullfrogs can generate ketones locally within their brains, creating an internal energy reserve. Lead author Joseph Santin, an associate professor, explains that this finding is remarkable because it suggests that brains can develop a backup power system separate from the liver.

The ability to produce ketone bodies locally in the brain provides bullfrogs with a crucial survival advantage during their hibernation-like state in winter. As their metabolism slows and energy reserves deplete, bullfrogs can quickly reactivate essential brain functions needed for survival. This metabolic backup system may explain why bullfrogs can transition back to full functionality so rapidly once oxygen and energy levels improve.

The researchers are now investigating the specific triggers that prompt the brain to produce ketones and how long the metabolic shift can sustain brain activity. While the findings shed light on amphibian biology, Santin believes they could also provide insights into human neurological disorders, as both bullfrogs and humans share fundamental biological processes.

Understanding how brains adapt to limited energy supplies could potentially lead to new avenues of research for conditions such as Alzheimer's disease, ALS, and schizophrenia. The study was published in the Proceedings of the National Academy of Sciences.