New Insights on Alzheimer’s Disease Treatment
Recent research is proposing a fresh perspective on how to prevent and perhaps treat Alzheimer’s—a condition that strips away memory and cognitive functions. Dr. Bruce Yankner, senior author of the study and geneticist at Harvard, remarked, “It seems to somehow turn back the clock.”
This study’s release comes at a crucial time, as the incidence of Alzheimer’s is on the rise. Currently, around 7 million Americans are living with this condition, and projections suggest this number could nearly double by 2050.
For years, it was thought that the accumulation of amyloid plaques—sticky protein clumps—was the main driver behind Alzheimer’s-related brain decay. However, new medications designed to eliminate these plaques haven’t significantly reversed memory loss and have only shown limited success in slowing down cognitive decline. It hints that there could be additional factors at play.
Yankner now suspects that a deficiency in lithium may be contributing to this issue.
Lithium has been a treatment option for mental health disorders, particularly bipolar disorder. Yet, the lithium used in this research is lithium orotate, which differs from the lithium carbonate typically prescribed.
The research team examined brain tissue from approximately 400 individuals who had donated after death, along with annual blood samples and memory assessments leading up to their passing. The participants varied from being cognitively healthy to having advanced Alzheimer’s.
Higher lithium levels were found in those who remained cognitively healthy. In contrast, when amyloid plaques began to develop, they appeared to bind to lithium, diminishing its availability to brain cells. This depletion affected areas of the brain, even those not laden with amyloid, essentially removing lithium’s protective properties.
To understand if lithium depletion was a catalyst for Alzheimer’s or merely a result, researchers restricted lithium in the diets of healthy mice. This led to inflammation and accelerated brain aging, hindering nerve communication and causing memory loss as evidenced by their performance in memory tests.
In a follow-up experiment, mice predisposed to develop Alzheimer’s-like conditions and tau tangles were also placed on a low-lithium diet. This significantly sped up the manifestation of the disease.
However, when lithium was reintroduced to their diets, even older mice with advanced symptoms showed memory improvement. The unique property of lithium orotate allows it to evade amyloid plaques, which seems vital for its effectiveness.
Experts outside the study acknowledge that these findings open a new pathway for developing Alzheimer’s treatments. Li-Huei Tsai, director at MIT’s Picower Institute for Learning and Memory, noted, “This study is looking at it from a novel angle.” She admitted, “I didn’t expect that the lithium level would be this critical.”
The typical lithium doses in mental health medications are high and can be hazardous, especially for older patients. In contrast, the amounts used in Yankner’s study were minuscule and matched naturally occurring levels in the brain, showing no toxicity in mice given small doses over time.
Research has previously hinted at a correlation between consistent lithium intake and lower dementia rates. For example, a 2017 Danish study noted that neighborhoods with lower lithium levels in local water sources had higher rates of dementia.
Saul Villeda from the University of California highlighted the relevance of the safety profile for lithium, which may facilitate potential trials for Alzheimer’s treatments. “If you’re lowering something, you just have to replace it back to the natural levels,” he stated, suggesting it’s a safer option than introducing unfamiliar medications.
Beyond lithium’s role, various factors have been linked to Alzheimer’s risk, including age, genetic history, and lifestyle choices like diet and exercise. A recent extensive study found that simple lifestyle changes could substantially improve cognitive health.
Many health-promoting foods contain natural lithium, like seafood, grains, and certain vegetables. Matt Kaeberlein from the University of Washington mentioned the Harvard study aligns well with prior research indicating lithium’s potential to slow aging in some organisms.
However, Kaeberlein warned that the ultimate test lies ahead—a substantial clinical trial comparing low doses of lithium orotate versus a placebo. The favorable safety profile suggests that human trials could be on the horizon.
Encouragingly, Kaeberlein remarked, “This work feeds my optimism that this will lead to potential therapeutics.” Yet, potential setbacks loom; a freeze on federal funding for Harvard, instated by the Trump administration, may limit research progression. Yankner expressed concern that halting such support could hinder their efforts significantly.
