title: Time-dependent contribution of non neuronal cells to BDNF production after ischemic stroke in rats.
abstract: Although brain-derived neurotrophic factor (BDNF) plays a central role in recovery after cerebral ischemia, little is known about cells involved in BDNF production after stroke. The present study testes the hypothesis that neurons are not the unique source of neosynthesized BDNF after stroke and that non neuronal-BDNF producing cells differ according to the delay after stroke induction. For this purpose, cellular localization of BDNF and BDNF content of each hemisphere were analysed in parallel before and after (4h, 24h and 8d) ischemic stroke in rats. Stroke of different severities was induced by embolization of the brain with variable number of calibrated microspheres allowing us to explore the association between BDNF production and neuronal death severity. The main results are that (a) unilateral stroke increased BDNF production in both hemispheres with a more intense and long-lasting effect in the lesioned hemisphere, (b) BDNF levels either of the lesioned or unlesioned hemispheres were not inversely correlated to neuronal death severity whatever the delay after stroke onset, (c) in the unlesioned hemisphere, stroke resulted in increased BDNF staining in neurons and ependymal cells (at 4h and 24h), (d) in the lesioned hemisphere, beside neurons and ependymal cells, microglial cells (at 24h), endothelial cells of cerebral arterioles (at 4h and 24h) and astrocytes (at 8d) exhibited a robust BDNF staining as well. Taken together, overall data suggest that non neuronal cells are able to produce substantial amount of BDNF after ischemic stroke and that more attention should be given to these cells in the design of strategies aimed at improving stroke recovery through BDNF-related mechanisms.
authors.affiliation: Laboratoire INSERM U887 Motricité-Plasticité, Dijon, France.
authors.forename: Yannick
authors.initials: Y
authors.lastname: Béjot
authors.forename: Anne
authors.initials: A
authors.lastname: Prigent-Tessier
authors.forename: Claire
authors.initials: C
authors.lastname: Cachia
authors.forename: Maurice
authors.initials: M
authors.lastname: Giroud
authors.forename: Claude
authors.initials: C
authors.lastname: Mossiat
authors.forename: Nathalie
authors.initials: N
authors.lastname: Bertrand
authors.forename: Philippe
authors.initials: P
authors.lastname: Garnier
authors.forename: Christine
authors.initials: C
authors.lastname: Marie
mesh_terms: D000818:Animals; D001921:Brain / Q000166:cytology; D001923:Brain Chemistry / Q000502:physiology*; D002545:Brain Ischemia / Q000150:complications / Q000378:metabolism*; D019208:Brain-Derived Neurotrophic Factor / Q000096:biosynthesis*; D002544:Cerebral Infarction / Q000378:metabolism; D007839:Functional Laterality / Q000502:physiology; D005904:Glial Fibrillary Acidic Protein / Q000096:biosynthesis; D020766:Intracranial Embolism / Q000378:metabolism; D008297:Male; D009474:Neurons / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D020521:Stroke / Q000209:etiology / Q000378:metabolism*; D013997:Time Factors
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D005904:Glial Fibrillary Acidic Protein