title: Attenuated BDNF-induced upregulation of GABAergic markers in neurons lacking Xbp1.
abstract: XBP1 is a transcription factor induced by unconventional splicing associated with endoplasmic reticulum stress and plays a role in development. Brain-derived neurotrophic factor (BDNF) causes splicing of Xbp1 mRNA in neurites, and Xbp1 is required for BDNF-induced neurite extension and branching. To search for the molecular mechanisms of how Xbp1 plays a role in neural development, comprehensive gene expression analysis was performed in primary telencephalic neurons obtained from Xbp1 knockout mice at embryonic day 12.5. By searching for the genes induced by BDNF in wild type neurons but not in Xbp1 knockout mice, we found that upregulation of three GABAergic markers, somatostatin (Sst), neuropeptide Y (Npy), and calbindin (Calb1), were compromised in Xbp1 knockout neurons. Attenuated upregulation of Npy and Calb1 in Xbp1 knockout neurons was confirmed by quantitative RT-PCR. This finding may be relevant to impaired BDNF-induced neurite extension in Xbp1 knockout neurons.
authors.affiliation: Laboratory for Molecular Dynamics of Mental Disorders, RIKEN Brain Science Institute, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan.
authors.forename: Akiko
authors.initials: A
authors.lastname: Hayashi
authors.forename: Takaoki
authors.initials: T
authors.lastname: Kasahara
authors.forename: Mizue
authors.initials: M
authors.lastname: Kametani
authors.forename: Tadafumi
authors.initials: T
authors.lastname: Kato
mesh_terms: D000818:Animals; D019208:Brain-Derived Neurotrophic Factor / Q000494:pharmacology / Q000502:physiology*; D064092:Calbindin 1; D064026:Calbindins; D004268:DNA-Binding Proteins / Q000235:genetics; D005260:Female; D005819:Genetic Markers; D051379:Mice; D018345:Mice, Knockout; D016501:Neurites / Q000187:drug effects / Q000378:metabolism*; D009478:Neuropeptide Y / Q000235:genetics; D020411:Oligonucleotide Array Sequence Analysis; D000071701:Regulatory Factor X Transcription Factors; D064030:S100 Calcium Binding Protein G / Q000235:genetics; D013004:Somatostatin / Q000235:genetics; D013687:Telencephalon / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics; D015854:Up-Regulation; D000071717:X-Box Binding Protein 1; D005680:gamma-Aminobutyric Acid / Q000378:metabolism*
chemical_list: D019208:Brain-Derived Neurotrophic Factor; C576499:Calb1 protein, mouse; D064092:Calbindin 1; D064026:Calbindins; D004268:DNA-Binding Proteins; D005819:Genetic Markers; D009478:Neuropeptide Y; D000071701:Regulatory Factor X Transcription Factors; D064030:S100 Calcium Binding Protein G; D014157:Transcription Factors; D000071717:X-Box Binding Protein 1; C000605544:Xbp1 protein, mouse; D013004:Somatostatin; D005680:gamma-Aminobutyric Acid