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Scientists just discovered a new brain phase between 50 and 75. It may help explain cognitive decline
A single-cell study of the hippocampus suggests brain aging is not a steady decline, but a coordinated immune, vascular, and neuronal overhaul.
Scientists at the University of California, San Diego School of Medicine just discovered a new brain phase.
A single-cell study identified a new biological phase the brain may enter between 50 and 75. The research offers new, important insights about brain aging and cognitive decline.
Between the ages of 50 and 75, the cellular landscape of the hippocampus, the brain’s memory region, begins to change. Immune cells get replaced, the genome’s physical structure loosens, and gene regulation is reshaped across multiple cell types.
The study’s findings, which were published in the peer-reviewed journal Science, suggest that aging is not so much a gradual decline than an active biological overhaul—one that may eventually be a target for treatment.
The researchers looked at individual cells from human hippocampal tissue collected at various points across the adult lifespan. They then mapped gene regulation and three-dimensional genome architecture to produce what Sci Tech Daily called “one of the most detailed accounts yet of how these features change as the human brain ages.”
A changing immune system
One of the most significant shifts the scientists discovered appeared in the microglia—the immune cells that help maintain and protect that brain. In midlife, between the ages of 50 and 75, the microglia that formed during embryonic development declined sharply. The researchers found that cells with similar traits to blood immune cells replaced the missing microglia cells.
Those replacements carried stronger inflammatory signatures, raising the possibility that they help drive the persistent inflammation tied to brain aging. At the same time, cell populations that maintain the blood-brain barrier dropped off substantially.
“Microglia are critical for maintaining brain homeostasis,” Bing Ren, PhD, a corresponding author of the study and scientific director and CEO of the New York Genome Center told Sci Tech Daily. “When these cells fail to perform their housekeeping duties, toxic materials accumulate that can trigger inflammatory processes that may contribute to neurodegenerative diseases.”Nathan Zemke, PhD, lead author and a principal investigator at the UC San Diego Center for Epigenomics, told Inc. that the immune system shift is directly connected to memory.
“Between roughly ages 50 and 80, many of the brain’s original immune cells appear to be replaced by immune cells that enter from the bloodstream,” he told Inc.
Those cells are important for clearing debris and protecting the brain, he added, but the incoming ones carry stronger inflammatory signals, which may contribute to the chronic brain inflammation commonly associated with cognitive decline.
Across several brain cell types, the genome’s three-dimensional structure grew progressively less organized with age. DNA folds into a precise architecture that helps determine which genes a cell can use. As that folding erodes, so does the cell’s control over its own machinery. The researchers suggest it may be a basic feature of brain aging.
That breakdown is what makes the structural changes matter for the mind, Zemke said. “Every type of brain cell relies on a carefully organized set of genetic instructions to perform its specialized role,” he told Inc. “As we age, that organization begins to break down, which may disrupt the genes needed to maintain healthy brain function and cognition.”
Notably, the immune, vascular, and neuronal systems appeared to change together, in a coordinated way.
“Importantly, this study reveals that aging is not simply a gradual decline, but involves coordinated and dynamic remodeling of immune, vascular, and neuronal systems,” said Xiangmin Xu, PhD, a co-corresponding author and director of the Center for Neural Circuit Mapping at UC Irvine told Sci Tech Daily.”These findings open the door to identifying new therapeutic targets aimed at preserving circuit integrity and brain function across the lifespan.”
Implications for the future of aging research
The findings should also change how professionals think about aging itself, Zemke told Inc. “Many biological changes associated with aging appear to accelerate around age 50, including increased inflammation and reduced cellular energy production,” he said. “However, the timing varies greatly from person to person. Understanding what drives that variation could help explain why some people age more successfully than others.”
The immune-cell shift may carry the greatest significance for Alzheimer’s research. The replacement of the brain’s original immune cells by blood-derived ones occurs during the same window when Alzheimer’s-related changes are thought to begin, Zemke said. The incoming cells show inflammatory features associated with the disease, suggesting the transition could be an important contributor to Alzheimer’s risk.
This post originally appeared at inc.com.
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