Flower isoforms mediate fitness selection of astrocytes through extracellular vesicles.

Flower isoforms coordinate astrocyte fitness selection via extracellular vesicles and nuclear signaling, with the win isoform promoting survival by downregulating caspase-3 under amyloid-β stress.

• Why it matters: Cellular fitness surveillance is known to remove less-fit cells, but how this is regulated across mammalian glial networks—especially in neurodegeneration—remains unclear.
• What they did: The study identifies a dual-domain mechanism in Flower, showing astrocytes release EVs carrying full-length Flower for non-contact fitness signaling, while the win-specific C-terminal domain translocates to the nucleus.
• The result: In APP-transgenic mice and human Alzheimer’s disease brains, Flower-positive astrocytes accumulate near amyloid-β plaques, and the win isoform promotes a neuroprotective reactive state that enhances plaque clearance.

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