High Blood Pressure Linked to Early Brain Cell Damage, Even Before Significant Rise
A new study suggests that high blood pressure may initiate damage to key brain cells responsible for cognitive function long before a substantial increase in blood pressure is detected, potentially explaining its link to cognitive decline and neurodegenerative diseases.
Researchers at Weill Cornell Medical College published their findings in the journal Neuron, revealing that hypertension can trigger early changes in gene expression within brain cells, potentially interfering with thinking and memory processes. The research offers potential avenues for preventing neurodegenerative disorders like Alzheimer’s disease.
The study highlights the established connection between high blood pressure and an increased risk of cognitive impairment, a condition often preceding Alzheimer’s disease and dementia, characterized by difficulties in decision-making and memory recall. However, the underlying mechanisms of this relationship have remained largely unknown.
Notably, the research team found that conventional hypertension medications, while effective in lowering blood pressure, exhibited limited impact on brain function. This suggests that damage to blood vessels may contribute to cognitive harm independently of elevated blood pressure levels.
“We found that three days after hypertension was induced in mice, key cells that contribute to cognitive impairment are affected before blood pressure rises,” explained Costantino Iadicola, Ph.D., director of the Weill Family Brain and Mind Institute and professor of neuroscience and neurobiology at Weill Cornell Medical College. “The bottom line is, it goes beyond blood pressure dysregulation.”
For the study, researchers induced hypertension in mice by administering the hormone angiotensin, mimicking the condition observed in humans. They then analyzed various brain cell types at two key time points: three days after induction, before blood pressure increased, and 42 days later, when blood pressure had risen and cognitive effects were apparent.
On day three, researchers observed significant alterations in gene expression within three specific cell types: endothelial cells, interneurons, and oligodendrocytes.
Specifically, endothelial cells – which line the inner surface of blood vessels – exhibited signs of premature senescence, characterized by decreased energy metabolism and increased markers of aging. Researchers also noted early indications of a compromised blood-brain barrier, crucial for regulating nutrient flow to the brain and blocking harmful substances.
Damage to interneurons – brain cells responsible for balancing excitatory and inhibitory nerve signals – led to an imbalance between these signals, a phenomenon frequently observed in Alzheimer’s disease.
Furthermore, oligodendrocytes – cells that insulate nerve fibers with myelin – were unable to properly express the genes necessary for their maintenance and renewal. Insufficient oligodendrocytes compromise myelin health, disrupting neuronal communication essential for cognitive function. More pronounced gene expression changes were observed on day 42, coinciding with the onset of cognitive decline.
“Understanding how hypertension affects the brain at the cellular and molecular level early in the disease may provide clues for finding ways to prevent neurodegeneration,” stated Anthony Pacholco, a postdoctoral researcher in neuroscience at Weill Cornell Medical College.
The study, published on November 18, 2025, underscores the importance of addressing hypertension not only for cardiovascular health but also for long-term brain health and cognitive preservation.
