Plasma BDNF Levels Vary in Relation to Body Weight in Females

Brain derived neurotrophic factor (BDNF) has been implicated in the pathophysiology of depression as well as neuropsychiatric and neurodegenerative disorders. Recent studies show a role of BDNF in energy metabolism and body weight regulation. We examined BDNF levels in plasma and cerebrospinal fluid (CSF) samples from age matched elderly depressed and control subjects. Also, the association of BDNF levels with age, gender, body weight, body mass index (BMI), and cognitive performance was evaluated. We did not find any significant differences in plasma and CSF BDNF levels between depressed and control subjects. Plasma BDNF levels were negatively correlated with age (but not with BMI and body weight), when analyses were performed including both depressed and control subjects. A significant reduction in plasma BDNF levels was observed in females as compared to male subjects, and the change in BDNF levels were significantly and positively related to body weight in females. Furthermore, significant increases in Total Recall and Delayed Recall values were found in females as compared to males. In conclusion, the lower BDNF levels observed in females suggest that changes in peripheral BDNF levels are likely secondary to an altered energy balance. However, further studies using larger sample size are warranted

The neuropathology of autism: defects of neurogenesis and neuronal migration, and dysplastic changes

Autism is characterized by a broad spectrum of clinical manifestations including qualitative impairments in social interactions and communication, and repetitive and stereotyped patterns of behavior. Abnormal acceleration of brain growth in early childhood, signs of slower growth of neurons, and minicolumn developmental abnormalities suggest multiregional alterations. The aim of this study was to detect the patterns of focal qualitative developmental defects and to identify brain regions that are prone to developmental alterations in autism. Formalin-fixed brain hemispheres of 13 autistic (4–60 years of age) and 14 age-matched control subjects were embedded in celloidin and cut into 200-μm-thick coronal sections, which were stained with cresyl violet and used for neuropathological evaluation. Thickening of the subependymal cell layer in two brains and subependymal nodular dysplasia in one brain is indicative of active neurogenesis in two autistic children. Subcortical, periventricular, hippocampal and cerebellar heterotopias detected in the brains of four autistic subjects (31%) reflect abnormal neuronal migration. Multifocal cerebral dysplasia resulted in local distortion of the cytoarchitecture of the neocortex in four brains (31%), of the entorhinal cortex in two brains (15%), of the cornu Ammonis in four brains and of the dentate gyrus in two brains. Cerebellar flocculonodular dysplasia detected in six subjects (46%), focal dysplasia in the vermis in one case, and hypoplasia in one subject indicate local failure of cerebellar development in 62% of autistic subjects. Detection of flocculonodular dysplasia in only one control subject and of a broad spectrum of focal qualitative neuropathological developmental changes in 12 of 13 examined brains of autistic subjects (92%) reflects multiregional dysregulation of neurogenesis, neuronal migration and maturation in autism, which may contribute to the heterogeneity of the clinical phenotype

Effect of gender on plasma BDNF levels.

<p>BDNF values (pg/ml) are expressed as mean (standard deviation).</p>*<p>p = 0.044.</p

BDNF levels in plasma and CSF samples from controls and MDD subjects.

<p>BDNF values (pg/ml) are expressed as mean (± standard deviation).</p

Association between plasma BDNF levels and age or BMI.

<p>Association between plasma BDNF levels and age or BMI.</p

Cognitive performance measurements.

<p>Values are expressed as mean (standard deviation).</p>*<p>p<0.001.</p

Case demographics.

<p>Values are expressed as mean (± standard deviation).</p><p>BMI  =  Body-mass index;</p><p>MMSE  =  Mini-mental State Exam score;</p>a<p> =  one subject’s years of education was not available.</p

Histoire du livre et de l’imprimé au Canada, Volume II

Entre 1840 et 1918, l’imprimé et le livre, qui avaient déjà contribué à l’élaboration de l’histoire et de l’identité du peuple canadien, deviennent désormais les médias de communication prédominants. Plus que jamais la culture de l’imprimé participe aux transformations qui métamorphoseront la colonie en véritable État, unifiant les peuples qui le composent. C’est cette synergie qui constituera l’un des aspects historiques et culturels les plus fascinants de cette période qui est au centre de ce deuxième volume de l’Histoire du livre et de l’imprimé au Canada. L’expansion du territoire canadien grâce à l’immigration massive, sa traversée par le chemin de fer et par la télégraphie renouvellent entièrement la dynamique de l’imprimé, de Terre-Neuve à Dawson City. Après 1880, l’imprimé de masse voit le jour grâce à la nouvelle technologie qui permet d’imprimer plus rapidement et à moindre coût, et grâce à la constitution de nouveaux marchés desservis par les librairies. Du missel au journal en passant par le livre de recette, le catalogue d’Eaton et l’almanach, les Canadiens sont dorénavant en contact quotidien avec cet objet matériel qu’est l’imprimé. Dans ce contexte, l’auteur émerge lentement, soutenu par un marché de distribution à l’échelle nord-américaine, par un nombre croissant de bibliothèques publiques et par des droits conquis pour la protection de son œuvre et sa diffusion