Today we’re going to be talking about a recent study that is rewriting neuroscience textbooks, potentially changing our understanding of Alzheimer’s disease, our brain’s immune system, and the potential for immunotherapy for the brain.

Today’s guest is Julia Belk, lead author of a new study that discovered that as we age, immune cells from the blood somehow cross the supposedly impenetrable blood–brain barrier, and replace the brain’s native immune cells, the microglia. The findings help us understand growing links between the aging immune system and Alzheimer’s disease and why certain blood mutations – ones traditionally linked to cancer – might actually protect against neurodegeneration.

Julia is an HHMI Hannah Gray postdoctoral fellow in the lab of Sidd Jaiswal at Stanford Medicine. Their research was supported by the Knight Initiative for Brain Resilience at Wu Tsai Neuro.

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