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Anatomically discrete sex differences and enhancement by testosterone of cell proliferation in the telencephalic ventricle zone of the adult canary brain.

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Anatomically discrete sex differences and enhancement by testosterone of cell proliferation in the telencephalic ventricle zone of the adult canary brain.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Barker, Jennifer M. Ball, Gregory F. Balthazart, Jacques
Description	Country affiliation: Belgium Author Affiliation: Barker JM ( GIGA Neurosciences, University of Liege, B-4000 Liege, Belgium.); Ball GF ( Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD 21218, United States.); Balthazart J ( GIGA Neurosciences, University of Liege, B-4000 Liege, Belgium. Electronic address: jbalthazart@ulg.ac.be.)
Abstract	Previous work in songbirds has suggested that testosterone increases neuronal recruitment and survival in HVC but does not affect neuronal proliferation in the ventricular zone and that males and females have similar rates of proliferation except at discrete locations. Many of these conclusions are however based on limited data or were inferred indirectly. Here we specifically tested the effects of testosterone on cellular proliferation in the ventricular zone of both male and female adult canaries. We implanted adult birds of both sexes with testosterone or empty implants for 1 week and injected them with BrdU. One day later, we collected their brains and quantified BrdU-positive cells in the ventricular zone (VZ) at different rostro-caudal levels of the brain, ranging from the level where the song nucleus Area X occurs through the caudal extent of HVC. Proliferation in the dorsal part of the VZ was low and unaffected by sex or testosterone treatment. In the ventral part of the VZ, females had more proliferating cells than males, but only at rostral levels, near Area X. Also in the ventral part of the VZ, testosterone increased proliferation in birds of both sexes, but only in the mid- to caudal-VZ, caudal to the level of Area X, around the septum and HVC. We thus demonstrate here that there is both an effect of testosterone and possibly a more subtle effect of sex on cellular proliferation in the adult songbird brain, and that these effects are specific to different levels of the brain.
File Format	HTM / HTML
ISSN	08910618
e-ISSN	18736300
DOI	10.1016/j.jchemneu.2013.10.005
Journal	Journal of Chemical Neuroanatomy
Volume Number	55
Language	English
Publisher	Elsevier
Publisher Date	2014-01-01
Publisher Place	Netherlands
Access Restriction	Open
Subject Keyword	Discipline Neurology Discipline Chemistry Discipline Anatomy Brain Drug Effects Cell Proliferation Cerebral Ventricles Sex Characteristics Testosterone Pharmacology Animals Cytology Canaries Neurons Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Cellular and Molecular Neuroscience

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