For decades, Alzheimer’s disease research has focused intensely on the buildup of amyloid plaques and tau tangles in the brain. But emerging evidence suggests the story is far more complex, with a growing understanding of the critical role vascular health plays in the development of this devastating condition. Fresh research from the Keck School of Medicine of USC indicates that subtle changes in how blood flows through the brain and delivers oxygen may be closely linked to early Alzheimer’s risk, potentially offering new avenues for earlier detection and intervention.
The study, published in Alzheimer’s & Dementia: The Journal of the Alzheimer’s Association, examined older adults with and without cognitive impairment, revealing a connection between cerebrovascular function and hallmarks of Alzheimer’s disease, including amyloid plaque buildup and shrinkage of the hippocampus – a brain region vital for memory. This suggests that maintaining healthy blood vessels in the brain could be a key component in preventing or delaying the onset of cognitive decline.
Researchers are increasingly recognizing that Alzheimer’s isn’t solely a neurodegenerative disease, but also involves vascular dysfunction. “Amyloid and tau are often considered the primary players in Alzheimer’s disease, but blood flow and oxygen delivery are also critical,” explained Amaryllis A. Tsiknia, a PhD candidate at USC and lead author of the study. “Our results show that when the brain’s vascular system functions more like it does in healthy aging, we also witness brain features that are linked to better cognitive health.”
To assess these changes, the team employed two noninvasive techniques: transcranial Doppler ultrasound, which measures blood flow velocity in major brain arteries, and near-infrared spectroscopy, which evaluates oxygen levels in brain tissue. By combining these readings with advanced mathematical modeling, researchers created indicators of cerebrovascular function, reflecting the brain’s ability to adjust blood flow and oxygen delivery in response to natural fluctuations.
Credit: Stevens INI. Amyloid PET imaging was used in the study to measure plaque buildup in the brain, a hallmark of Alzheimer’s disease. Warmer colors indicate higher amyloid levels.
Vascular Health and Alzheimer’s Biomarkers
The study found that participants with healthier vascular indicators tended to have lower levels of amyloid plaques and a larger hippocampus – both factors associated with reduced Alzheimer’s risk. “These vascular measures are capturing something meaningful about brain health,” said Meredith N. Braskie, PhD, senior author of the study and assistant professor of neurology at the Keck School of Medicine. “They appear to align with what we see on MRI and PET scans that are commonly used to study Alzheimer’s disease, providing important information about how vascular health and standard brain measures of Alzheimer’s disease risk may be related.”
Conversely, individuals diagnosed with mild cognitive impairment or dementia exhibited weaker vascular function compared to those with normal cognitive abilities. This observation reinforces the idea that declining blood vessel health is an integral part of the Alzheimer’s disease process. According to the Alzheimer’s Association’s 2025 Facts and Figures report, more than 7 million Americans are currently living with Alzheimer’s disease.
Potential for Early Detection and Broader Screening
One of the most promising aspects of this research is the potential for earlier and more accessible detection. The noninvasive techniques used in the study are less expensive and easier to administer than traditional methods like MRI and PET imaging, which can involve radiation exposure and are not always readily available. This simplicity could pave the way for large-scale screening programs or for utilize with individuals who cannot undergo more intensive brain imaging.
Arthur W. Toga, PhD, director of the Stevens INI, emphasized the significance of these findings, stating, “These findings add to growing evidence that Alzheimer’s involves meaningful vascular contributions in addition to classic neurodegenerative changes. Understanding how blood flow and oxygen regulation interact with amyloid and brain structure opens new doors for early detection and potentially prevention.”
Looking Ahead: Longitudinal Studies and Vascular Interventions
The researchers caution that their findings represent a snapshot in time and do not establish a direct cause-and-effect relationship. Ongoing longitudinal studies are tracking participants to determine whether changes in vascular measures can predict future cognitive decline or response to treatment. “If You can track these signals over time, we may be able to identify people at higher risk earlier and test whether improving vascular health can leisurely or reduce Alzheimer’s-related brain changes,” Tsiknia said.
This research underscores the importance of prioritizing cardiovascular health throughout life as a potential strategy for reducing Alzheimer’s risk. Further investigation is needed to determine whether interventions aimed at improving blood flow and oxygen delivery to the brain can effectively prevent or delay the onset of this devastating disease.
Disclaimer: This article provides information for general knowledge and informational purposes only, and does not constitute medical advice. This proves essential to consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
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