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OBJECTIVE In-vivo imaging of beta-amyloid plaques (Abeta) may improve both early detection of Alzheimer disease (AD) and efficacy assessment of new treatments for AD. The authors' aim was to develop a novel Abeta-specific positron-emission tomography (PET) tracer. METHODS Five female AD patients (54-77 years old) and six healthy female comparison subjects(More)
Alzheimer’s disease (AD), considered the commonest neurodegenerative cause of dementia, is associated with hallmark pathologies including extracellular amyloid-β protein (Aβ) deposition in extracellular senile plaques and vessels, and intraneuronal tau deposition as neurofibrillary tangles. Although AD is usually categorized as neurodegeneration distinct(More)
The effect of catecholamine depletion, achieved by per-oral administration of 5250 mg alpha-methyl-para-tyrosine (AMPT) given in the 29 h prior to [11C]raclopride positron emission tomography (PET) was studied on measures of dopamine (DA) release, mood, and attention. Neostriatal DA levels in vivo were estimated by comparing the neostriatal DA D(2) receptor(More)
OBJECTIVES To review recent findings from positron emission tomography (PET) and single photon emission computed tomography (SPECT) studies that investigate the pathophysiology and treatment of schizophrenia, depression, and dementia. METHODS We carried out a review of the literature. RESULTS PET and SPECT studies have provided evidence of dopamine(More)
Infection with several important pathogens could constitute risk factors for cognitive impairment, dementia, and Alzheimer's disease (AD) in particular. This review summarizes the data related to infectious agents that appear to have a relationship with AD. Infections with herpes simplex virus type 1, picornavirus, Borna disease virus, Chlamydia pneumoniae,(More)
In an attempt to clarify the effect of deep brain stimulation (DBS) to the subthalamic nucleus (STN) on mood state, previous evidence and problems were evaluated through a systematic literature search. Twenty three articles reported the effect of STN DBS on mood state in Parkinson's disease (PD), and antidepressant, depressant, and mania-induced effects(More)
BACKGROUND A previous single photon emission computed tomography study showed decreased central type benzodiazepine receptors in the prefrontal cortex in Vietnam War veterans with posttraumatic stress disorder. To assess the generalizability of this finding to patients with more recent history, we studied central type benzodiazepine receptors in Gulf War(More)
Frontotemporal lobar degeneration is comprised of three syndromes: frontotemporal dementia (FTD), semantic dementia, and progressive nonfluent aphasia, with FTD being the most prevalent. FTD is characterized predominantly by character change and disordered social conduct. A variety of pathologies may underlie these syndromes, yet it is the location of the(More)
BACKGROUND A recent magnetic resonance spectroscopy (MRS) study revealed low gamma-aminobutyric acid (GABA) levels in the occipital cortex of depressed patients. No in vivo study has been reported to measure postsynaptic GABA receptors in the patients. METHODS Cortical benzodiazepine (BZ) binding to GABA(A) receptors was measured with [(123)I]iomazenil(More)
CONTEXT Adaptations in gamma-aminobutyric acid type A (GABA(A))-benzodiazepine receptors contribute to the neurobiology of human alcohol dependence and withdrawal. OBJECTIVE To study GABA(A)-benzodiazepine receptor adaptations in subjects with alcohol dependence over the first month of sobriety. DESIGN Inpatients who were not receiving medication, were(More)