Brain aging study reveals major biological transition between ages 50 and 75

The short version

• Researchers discovered a major biological transformation in the human brain between ages 50 and 75, driven by structural and cellular alterations.[ScienceDaily]
• Original embryonic microglia sharp decline during this period and are replaced by blood-like inflammatory immune cells.[ScienceDaily]
• The study also identified a drop in blood-brain barrier maintenance cells and widespread erosion of 3D genome architecture.[ScienceDaily]
• It remains uncertain whether replacement immune cells directly cause chronic brain inflammation as individuals age.[ScienceDaily]

Key facts

• Human brain aging involves a major biological transformation marked by significant shifts between ages 50 and 75.[ScienceDaily]
• Embryonic microglia decline between ages 50 and 75 and are replaced by cells resembling blood-derived immune cells.[ScienceDaily]
• Researchers observed a decline in cell populations responsible for maintaining the blood-brain barrier.[ScienceDaily]
• A broad erosion of three-dimensional genome architecture was identified across multiple brain cell types.[ScienceDaily]
• The research was published in Science as part of the NIH 4D Nucleome Common Fund program.[ScienceDaily]

Sources

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• Scientists discover a major brain shift between ages 50 and 75ScienceDaily - Science