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Kim, Eunhee

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Kim, Eunhee

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    Astrocytic interleukin-3 programs microglia and limits Alzheimer’s disease
    (Springer Science and Business Media LLC, 2021-07-14) McAlpine, Cameron; Park, Joseph; Griciuc, Ana; Kim, Eunhee; Choi, Se Hoon; Iwamoto, Yoshiko; Kiss, Máté G.; Christie, Kathleen; Vinegoni, Claudio; Poller, Wolfram; Mindur, John; Chan, Christopher; He, Shun; Janssen, Henrike; Wong, Lai Ping; Downey, Jeffrey; Singh, Sumnima; Anzai, Atsushi; Kahles, Florian; Jorfi, Mehdi; Feruglio, Paulo; Sadreyev, Ruslan; Weissleder, Ralph; Kleinstiver, Benjamin; Nahrendorf, Matthias; Tanzi, Rudolph; Swirski, Filip
    Communication within the glial cell ecosystem is essential to neuronal and brain health1–3. The influence of glial cells on β-amyloid (Aβ) and neurofibrillary tau accumulation and clearance in Alzheimer’s disease (AD) is poorly understood, despite growing awareness that these are therapeutically important interactions4,5. Here we show, in humans and mice, that astrocyte-sourced interleukin-3 (IL-3) reprograms microglia to ameliorate AD pathology. Upon recognition of Aβ deposits, microglia augment IL-3Rɑ, IL-3’s specific receptor, rendering them responsive to IL-3. Astrocytes constitutively produce IL-3, which elicits transcriptional, morphological, and functional reprograming of microglia endowing them with an acute immune response program, enhanced motility, and the capacity to cluster and clear Aβ and tau aggregates. These changes restrict AD pathology and cognitive decline. This study identifies IL-3 as a critical mediator of astrocyte-microglia crosstalk and a node for therapeutic intervention in AD.