Learn More
Glutamate and glutamate receptors are well known to play a major excitatory role in the brain. Recent findings on ovarian steroids and selective estrogen receptor modulators (SERMs) activity on rat brain AMPA and NMDA receptors are reviewed. Ovarian steroid withdrawal by ovariectomy is without effect on NMDA and AMPA receptors in most brain regions, except(More)
We investigated the effect of 10 months ovariectomy and a correction therapy, 2 weeks before the rats were killed, of oestradiol, progesterone or their combination on NMDA and AMPA receptor binding in the hippocampus, dentate gyrus, striatum, nucleus accumbens and frontal cortex of the rat brain as well as on amino acid levels in frontal cortex. NMDA and(More)
OBJECT To investigate the utility of [15O]H2O positron emission tomography (PET) activation studies in the presurgical mapping of primary somatosensory cortex, the authors compared the magnitude and location of activation foci obtained using PET scanning with the results of intraoperative cortical stimulation (ICS). METHODS The authors used PET scanning(More)
The effect of short-term (Sprague-Dawley rats, two weeks) and long-term ovariectomy (Sprague-Dawley and Fischer rats, three months) on serotonin 5-hydroxytryptamine2A receptors in different regions of the brain and its possible correction with an 17 beta-estradiol treatment (10 micrograms, b.i.d., two weeks) were studied in comparison to intact rats.(More)
Hormonal specificity of modulation of brain 5-HT(2A) receptors was investigated by comparing activity of compounds with varying effects on estrogen response in breast, bone, and uterus. A two-week estradiol treatment stimulated the decreased uterine weight of ovariectomized rats to intact rat values whereas an increase of 29% with tamoxifen and 16% with(More)
Transgenic mice bearing a transgene coding for a glucocorticoid receptor antisense mRNA, which partially blocks glucocorticoid receptor expression, were used to investigate the long-term effect of hypothalamic-pituitary-adrenal axis dysfunction on brain dopamine transmission. Compared to control mice, the transgenic animals showed increased(More)
This study examined abstract syntactic categorization in infants, using the case of grammatical gender. Ninety-six French-learning 14-, 17-, 20-, and 30-month-olds completed the study. In a preferential looking procedure infants were tested on their generalized knowledge of grammatical gender involving pseudonouns and gender-marking determiners. The(More)
[(18)F]fluoroethoxybenzovesamicol ([(18)F]FEOBV) is one of the most promising radioligands for imaging the vesicular ACh transporter (VAChT) with positron emission tomography (PET). We report here that this method can detect subtle cholinergic terminals losses such as those associated with aging, or those following a partial lesion of the nucleus basalis(More)
Cholinergic neurons of the pedunculopontine tegmental nucleus (PPTg) are thought to be involved in cognitive functions such as sustained attention, and lesions of these cells have been documented in patients showing fluctuations of attention such as in Parkinson's disease or dementia with Lewy Body. Animal studies have been conducted to support the role of(More)
OBJECTIVE To assess the functioning of mesolimbic and fronto-striatal areas involved in reward-based spatial learning in teenaged girls with bulimia nervosa (BN) that might be involved in the development and maintenance of maladaptive behaviors characteristic of the disorder. METHOD We compared functional magnetic resonance imaging blood oxygen(More)