A new study reveals that Alzheimer's disease shares a surprising biological driver with blood cancers like leukemia. Researchers found that the brain's immune cells, called microglia, accumulate specific cancer-driving mutations as they age. These mutant cells create a hostile inflammatory environment that kills neurons, rather than forming tumors. The findings suggest Alzheimer's could be treatable with existing cancer drugs and detectable via simple blood tests.
The Research
Led by Christopher Walsh, MD, PhD, at Boston Children's Hospital and Harvard Medical School, the study published in Cell sequenced 149 cancer-driving genes from brain tissue samples of 190 Alzheimer's patients and 121 healthy controls. Alzheimer's brains had significantly more single DNA letter changes, with the most changes concentrated in five specific cancer driver genes. Surprisingly, the same mutations were found in blood cells of the same patients, suggesting that immune cells carrying these mutations may cross the blood-brain barrier and contribute to disease. The team theorizes that age-related weakening of the blood-brain barrier allows mutant immune cells to enter the brain, where they proliferate and cause excessive inflammation, killing neurons.
Why It Matters
If Alzheimer's is driven by cancer-like mutations, then drugs already FDA-approved for blood cancers could potentially be repurposed to slow or stop the disease. Additionally, a genetic blood test could identify high-risk individuals years before symptoms appear. This research also highlights the concept of somatic mosaicism—genetic changes that accumulate after birth—as a key factor in age-related brain diseases.
What You Can Do
While these findings are preliminary, they underscore the importance of maintaining a healthy immune system and blood-brain barrier. A balanced diet, regular exercise, and managing chronic inflammation may help. Stay informed about clinical trials that repurpose cancer drugs for Alzheimer's, as new treatment options could emerge in the coming years.
Source: Neuroscience News
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