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100 1 _ |a Stokowska, Anna
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245 _ _ |a Complement C3a treatment accelerates recovery after stroke via modulation of astrocyte reactivity and cortical connectivity
260 _ _ |a Ann Arbor, Mich.
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520 _ _ |a Despite advances in acute care, ischemic stroke remains a major cause of long-term disability. Approaches targeting both neuronal and glial responses are needed to enhance recovery and improve long-term outcome. The complement C3a receptor (C3aR) is a regulator of inflammation with roles in neurodevelopment, neural plasticity, and neurodegeneration. Using mice lacking C3aR (C3aR–/–) and mice overexpressing C3a in the brain, we uncovered 2 opposing effects of C3aR signaling on functional recovery after ischemic stroke: inhibition in the acute phase and facilitation in the later phase. Peri-infarct astrocyte reactivity was increased and density of microglia reduced in C3aR–/– mice; C3a overexpression led to the opposite effects. Pharmacological treatment of wild-type mice with intranasal C3a starting 7 days after stroke accelerated recovery of motor function and attenuated astrocyte reactivity without enhancing microgliosis. C3a treatment stimulated global white matter reorganization, increased peri-infarct structural connectivity, and upregulated Igf1 and Thbs4 in the peri-infarct cortex. Thus, C3a treatment from day 7 after stroke exerts positive effects on astrocytes and neuronal connectivity while avoiding the deleterious consequences of C3aR signaling during the acute phase. Intranasal administration of C3aR agonists within a convenient time window holds translational promise to improve outcome after ischemic stroke.
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536 _ _ |a DFG project 431549029 - SFB 1451: Schlüsselmechanismen normaler und krankheitsbedingt gestörter motorischer Kontrolle (431549029)
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700 1 _ |a Aswendt, Markus
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700 1 _ |a Zucha, Daniel
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700 1 _ |a Lohmann, Stephanie
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700 1 _ |a Wieters, Frederique
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700 1 _ |a Morán Suarez, Javier
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700 1 _ |a Atkins, Alison L.
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700 1 _ |a Li, YiXian
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700 1 _ |a Miteva, Maria
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700 1 _ |a Lewin, Julia
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700 1 _ |a Wiedermann, Dirk
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700 1 _ |a Diedenhofen, Michael
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700 1 _ |a Torinsson Naluai, Åsa
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700 1 _ |a Abaffy, Pavel
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700 1 _ |a Valihrach, Lukas
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700 1 _ |a Kubista, Mikael
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700 1 _ |a Hoehn, Mathias
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700 1 _ |a Pekny, Milos
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700 1 _ |a Pekna, Marcela
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773 _ _ |a 10.1172/JCI162253
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