๐ง Stanford Study: Blood Immune Cells Flood Into the Human Brain Starting in Middle Age
A Stanford team, publishing in Nature, found that immune cells from the bloodstream actively migrate into the aging brain and can transform into microglia โ the brain's own immune defenders โ starting as early as middle age. This overturns a decades-old assumption that the brain operates as an immunologically isolated organ. The discovery could reshape how scientists think about Alzheimer's, Parkinson's, and other age-related brain diseases. Could this immune cell influx be protective, harmful, or both?
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