title: Pro-Brain-Derived Neurotrophic Factor (proBDNF)-Mediated p75NTR Activation Promotes Depolarizing Actions of GABA and Increases Susceptibility to Epileptic Seizures.
abstract: The brain-derived neurotrophic factor (BDNF) is synthesized as a precursor, namely proBDNF, which can be processed into mature BDNF (mBDNF). Evidences suggest that proBDNF signaling through p75NTR may account for the emergence of neurological disorders. These findings support the view that the relative availability of mBDNF and proBDNF forms is an important mechanism underlying brain circuit formation and cognitive functions. Here we describe novel insights into the proBDNF/p75NTR mechanisms and function in vivo in modulating neuronal circuit and synaptic plasticity during the first postnatal weeks in rats. Our results showed that increased proBDNF/p75NTR signaling during development maintains a depolarizing γ-aminobutyric acid (GABA) response in a KCC2-dependent manner in mature neuronal cells. This resulted in altered excitation/inhibition balance and enhanced neuronal network activity. The enhanced proBDNF/p75NTR signaling ultimately led to increased seizure susceptibility that was abolished by in vivo injection of function blocking p75NTR antibody. Altogether, our study shed new light on how proBDNF/p75NTR signaling can orchestrate the GABA excitatory/inhibitory developmental sequence leading to depolarizing and excitatory actions of GABA in adulthood and subsequent epileptic disorders.
authors.affiliation: Aix-Marseille University,  Département de Biologie, Parc Scientifique de Luminy, 13273 Marseille, France.|INSERM-Institut National de la Santé et de la Recherche Médicale, Unité 901, Marseille, Parc Scientifique de Luminy, 13273 Marseille, France.|INMED-Institut de Neurobiologie de la Méditerranée, Parc Scientifique de Luminy, 13273 Marseille, France.
authors.forename: Baptiste
authors.initials: B
authors.lastname: Riffault
authors.affiliation: Aix-Marseille University,  Département de Biologie, Parc Scientifique de Luminy, 13273 Marseille, France.|INSERM-Institut National de la Santé et de la Recherche Médicale, Unité 901, Marseille, Parc Scientifique de Luminy, 13273 Marseille, France.|INMED-Institut de Neurobiologie de la Méditerranée, Parc Scientifique de Luminy, 13273 Marseille, France.
authors.forename: Nazim
authors.initials: N
authors.lastname: Kourdougli
authors.affiliation: Aix-Marseille University,  Département de Biologie, Parc Scientifique de Luminy, 13273 Marseille, France.|INSERM-Institut National de la Santé et de la Recherche Médicale, Unité 901, Marseille, Parc Scientifique de Luminy, 13273 Marseille, France.|INMED-Institut de Neurobiologie de la Méditerranée, Parc Scientifique de Luminy, 13273 Marseille, France.
authors.forename: Camille
authors.initials: C
authors.lastname: Dumon
authors.affiliation: Aix-Marseille University,  Département de Biologie, Parc Scientifique de Luminy, 13273 Marseille, France.|INSERM-Institut National de la Santé et de la Recherche Médicale, Unité 901, Marseille, Parc Scientifique de Luminy, 13273 Marseille, France.|INMED-Institut de Neurobiologie de la Méditerranée, Parc Scientifique de Luminy, 13273 Marseille, France.
authors.forename: Nadine
authors.initials: N
authors.lastname: Ferrand
authors.affiliation: Aix-Marseille University,  Département de Biologie, Parc Scientifique de Luminy, 13273 Marseille, France.|Plateforme Post-Génomique, INMED, 13273 Marseille, France.
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Buhler
authors.affiliation: Aix-Marseille University,  Département de Biologie, Parc Scientifique de Luminy, 13273 Marseille, France.|Plateforme Post-Génomique, INMED, 13273 Marseille, France.
authors.forename: Fabienne
authors.initials: F
authors.lastname: Schaller
authors.affiliation: Aix-Marseille University, Département de Biologie, NIA, UMR 7260 CNRS, 13331 cedex 03, Marseille, France.
authors.forename: Caroline
authors.initials: C
authors.lastname: Chambon
authors.affiliation: Aix-Marseille University,  Département de Biologie, Parc Scientifique de Luminy, 13273 Marseille, France.|INSERM-Institut National de la Santé et de la Recherche Médicale, Unité 901, Marseille, Parc Scientifique de Luminy, 13273 Marseille, France.|INMED-Institut de Neurobiologie de la Méditerranée, Parc Scientifique de Luminy, 13273 Marseille, France.
authors.forename: Claudio
authors.initials: C
authors.lastname: Rivera
authors.affiliation: Aix-Marseille University,  Département de Biologie, Parc Scientifique de Luminy, 13273 Marseille, France.|INSERM-Institut National de la Santé et de la Recherche Médicale, Unité 901, Marseille, Parc Scientifique de Luminy, 13273 Marseille, France.|INMED-Institut de Neurobiologie de la Méditerranée, Parc Scientifique de Luminy, 13273 Marseille, France.
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Gaiarsa
authors.affiliation: Aix-Marseille University,  Département de Biologie, Parc Scientifique de Luminy, 13273 Marseille, France.|INSERM-Institut National de la Santé et de la Recherche Médicale, Unité 901, Marseille, Parc Scientifique de Luminy, 13273 Marseille, France.|INMED-Institut de Neurobiologie de la Méditerranée, Parc Scientifique de Luminy, 13273 Marseille, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Porcher
mesh_terms: D000818:Animals; D019208:Brain-Derived Neurotrophic Factor / Q000096:biosynthesis*; D005260:Female; D018682:GABA Agents / Q000378:metabolism / Q000494:pharmacology; D008297:Male; D009419:Nerve Tissue Proteins; D009924:Organ Culture Techniques; D011247:Pregnancy; D011498:Protein Precursors / Q000096:biosynthesis*; D051381:Rats; D017208:Rats, Wistar; D017978:Receptors, Growth Factor; D017475:Receptors, Nerve Growth Factor / Q000096:biosynthesis*; D012640:Seizures / Q000378:metabolism*; D013003:Somatosensory Cortex / Q000187:drug effects / Q000378:metabolism; D005680:gamma-Aminobutyric Acid / Q000378:metabolism / Q000494:pharmacology*
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D018682:GABA Agents; D009419:Nerve Tissue Proteins; D011498:Protein Precursors; D017978:Receptors, Growth Factor; D017475:Receptors, Nerve Growth Factor; C426674:brain-derived neurotrophic factor precursor; C068313:Ngfr protein, rat; D005680:gamma-Aminobutyric Acid
keywords: KCC2; chloride; epileptogenesis; proneurotrophins