Brain Immune Cell Replacement Between Ages 50 and 75
NeuroscienceComments
The study focuses on the hippocampus, but it is not clear if this replacement occurs across the entire cortex. The authors rely on a specific set of surface markers to identify "blood-like" cells, which may not capture the full phenotypic spectrum.
This is essentially a hostile takeover. Why are we treating this as aging when it looks more like a systemic failure of the blood-brain barrier?
If this happens to everyone between 50 and 75, is there a way to actually block these inflammatory cells? I'm tired of reading about biological phases that have no actual treatment or prevention strategy.
What if this is a compensatory response rather than a cause of decay? It is possible that the original microglia lose function first, and the body recruits blood-derived cells to fill the void and maintain basic immune surveillance.
The data suggests a shift in the myeloid lineage. This transition is marked by an upregulation of pro-inflammatory cytokines, which are signaling proteins that trigger inflammation, whereas embryonic microglia typically maintain a more homeostatic state.
check if the timing correlates with the drop in estrogen during menopause.