Scientists at Indiana University School of Medicine have identified a new Alzheimer’s drug target: an enzyme called IDOL. Removing IDOL from neurons sharply reduced amyloid plaques and improved key brain processes linked to resilience and cell communication. The discovery could lead to treatments that go beyond slowing Alzheimer’s to potentially protect the brain from further decline.
The Research
Researchers led by Kim, P. Michael Conneally Professor of Medical and Molecular Genetics, and Hande Karahan, PhD, assistant research professor of medical and molecular genetics, published their findings in Alzheimer’s & Dementia: The Journal of the Alzheimer’s Association (May 2026). They created two Alzheimer’s mouse models by deleting the IDOL gene in different brain cell types: neurons and microglia (immune cells).
Surprisingly, the strongest effects came from removing IDOL from neurons, not microglia. In neurons, IDOL deletion lowered amyloid plaque levels and reduced levels of apolipoprotein E (APOE), a protein strongly linked to Alzheimer’s risk (especially the APOE4 variant). The team also found increased levels of receptors that regulate APOE and plaques, which are important for healthy neuron communication and lipid metabolism.
“What makes this exciting is that we now have a specific target that could lead to a new type of treatment,” said Kim. Karahan added, “Not only decreasing amyloid levels but also increasing resilience to these pathological changes could maximize clinical benefits.”
Why It Matters
Current FDA-approved Alzheimer’s drugs (lecanemab, donanemab) work by clearing amyloid plaques, but they only slow decline. Targeting IDOL offers a different strategy: it both reduces plaques and may help the brain resist damage. Since IDOL is an enzyme, it has well-defined “pockets” where drugs can bind precisely, potentially minimizing side effects.
This approach could be especially valuable because Alzheimer’s is often diagnosed after significant plaque buildup. Enhancing resilience alongside plaque removal might help patients maintain cognitive function longer.
What You Can Do
While these findings are early (animal models), they highlight the importance of brain health research. You can support your cognitive resilience with lifestyle habits: regular aerobic exercise, a Mediterranean diet rich in omega-3s, quality sleep, and mentally stimulating activities. Stay informed about scientific breakthroughs that may one day translate into treatments.
Source: ScienceDaily Mind & Brain
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