Brain Discovery Could Unlock Better Sleep for Alzheimer’s and Diabetes Patients

Summary: University of Kentucky researchers have discovered that ATP-sensitive potassium (KATP) channels in the brain act as energy sensors that regulate sleep patterns and transitions—offering a potential new therapeutic target for sleep disturbances linked to conditions like Alzheimer’s, diabetes, and epilepsy.

Key Takeaways:

• KATP channels in the brain act as energy sensors that play a crucial role in regulating sleep-wake cycles and transitions between sleep stages.
• The study shows that even small metabolic changes can significantly impact sleep quality, cognition, and behavior.
• Researchers found that KATP channels follow a circadian rhythm and help regulate lactate, a metabolite involved in the sleep-wake transition.
• Since FDA-approved drugs targeting KATP channels already exist, the findings could open a new pathway for treating sleep disorders in metabolic and neurodegenerative diseases.

Research from the University of Kentucky’s (UK) Sanders-Brown Center on Aging illuminates how the brain’s energy utilization significantly influences our sleep patterns. 

The study, recently published in The Proceedings of the National Academy of Sciences (PNAS), discovered that channels in the brain, called ATP-sensitive potassium (KATP) channels, act as energy sensors and play a pivotal role in maintaining stable sleep-wake cycles and facilitating smooth transitions between cycles.

The research was led by Nicholas Constantino, a doctoral neuroscience student working in the lab of Shannon Macauley, PhD. The project was an interdepartmental collaboration between physiology, neuroscience, Sanders-Brown, and the Central Nervous System-Metabolism Centers of Biomedical Research Excellence (CNS-Met COBRE). 

The study delved into the impact of metabolic changes on sleep, particularly the molecular mechanisms connecting metabolism and brain cell excitability, using mouse models lacking KATP channels and techniques like electroencephalography.

“Our study shows that even small changes in energy usage can profoundly impact behavior,” says Macauley, an associate professor of physiology in the UK College of Medicine, in a release.

These changes impact when we sleep, how we sleep, and the overall quality of our sleep. The study identified a previously unknown function of KATP channels in sleep regulation.

“We discovered that KATP channels—key regulators linking metabolism and excitability—play a previously unrecognized role in sleep regulation,” Macauley says. “We did not fully appreciate the profound role that fuel utilization has on the integrity of sleep and behaviors while we are awake.”

The researchers also discovered that KATP channels on neurons have a daily rhythm.

“We did not know that KATP channels on neurons display a circadian rhythm of expression that suggests a role in regulating sleep,” Macauley says. “Additionally, we discovered that KATP channels regulate lactate levels, a key metabolite for transitioning between sleep and wakefulness.”

When these channels don’t function properly, brain cells can’t tell how much energy they need.

“When cells lack the ability to assess their own metabolic needs, essential processes like neurotransmitter synthesis become compromised, which in our study was linked to impaired cognition and increased anxiety,” Macauley says. “Most importantly, we found that KATP channels have a profound impact on sleep, particularly in enabling smooth transitions between wakefulness, restorative slow wave sleep, and REM sleep. This is particularly relevant for diseases like Alzheimer’s, diabetes, and epilepsy, which are associated with both altered KATP-channel activity and sleep disturbances.”

Food and Drug Administration-approved drugs targeting KATP channels already exist, so this research suggests a promising new therapeutic approach for restoring sleep in individuals with Alzheimer’s, epilepsy, or diabetes.

The core message of this research, as stated by the scientists, is the significant impact of fuel sensing and utilization on our sleep and wakefulness.

“Altering the way the body can sense and use fuel can deeply impact the way we sleep and our behaviors while we are awake,” Macauley says.