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We have previously shown that gene therapy delivery of human NT3 into affected forelimb muscles improves sensorimotor recovery after stroke in adult and elderly rats. Here, to move toward the clinic, we tested the hypothesis that intramuscular infusion of NT3 protein could improve sensorimotor recovery after stroke.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Rats received unilateral ischemic stroke in sensorimotor cortex. To simulate a clinically feasible time to treatment, 24 hours later rats were randomized to receive NT3 or vehicle by infusion into affected triceps brachii for 4 weeks using implanted catheters and minipumps.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Radiolabeled NT3 crossed from the bloodstream into the brain and spinal cord in rodents with or without strokes. NT3 increased the accuracy of forelimb placement during walking on a horizontal ladder and increased use of the affected arm for lateral support during rearing. NT3 also reversed sensory impairment of the affected wrist. Functional magnetic resonance imaging during stimulation of the affected wrist showed spontaneous recovery of peri\u2010infarct blood oxygenation level\u2013dependent signal that NT3 did not further enhance. Rather, NT3 induced neuroplasticity of the spared corticospinal and serotonergic pathways.<\/jats:p><\/jats:sec><jats:sec><jats:title>Interpretation<\/jats:title><jats:p>Our results show that delayed, peripheral infusion of NT3 can improve sensorimotor function after ischemic stroke. Phase I and II clinical trials of NT3 (for constipation and neuropathy) have shown that peripheral high doses are safe and well tolerated, which paves the way for NT3 as a therapy for stroke. <jats:bold>ANN NEUROL 2019;85:32\u201346.<\/jats:bold><\/jats:p><\/jats:sec>","DOI":"10.1002\/ana.25386","type":"journal-article","created":{"date-parts":[[2018,12,7]],"date-time":"2018-12-07T12:57:21Z","timestamp":1544187441000},"page":"32-46","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Stroke Recovery in Rats after 24\u2010Hour\u2013Delayed Intramuscular Neurotrophin\u20103 Infusion"],"prefix":"10.1002","volume":"85","author":[{"given":"Denise A.","family":"Duricki","sequence":"first","affiliation":[{"name":"Neurorestoration Group Wolfson Centre for Age\u2010Related Diseases, King's College London  London United Kingdom"},{"name":"Centre for Integrative Biology King's College London  London United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Svetlana","family":"Drndarski","sequence":"additional","affiliation":[{"name":"Blood\u2010Brain Barrier Group Institute of Pharmaceutical Science, King's College London  London United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michel","family":"Bernanos","sequence":"additional","affiliation":[{"name":"Neuroimaging Research Group King's College London  London United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tobias","family":"Wood","sequence":"additional","affiliation":[{"name":"Neuroimaging Research Group King's College London  London United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karen","family":"Bosch","sequence":"additional","affiliation":[{"name":"Neurorestoration Group Wolfson Centre for Age\u2010Related Diseases, King's College London  London United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qin","family":"Chen","sequence":"additional","affiliation":[{"name":"Center for Cell and Gene Therapy, Department of Neuroscience Baylor College of Medicine  Houston TX"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H. 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