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Title

Alterations of apparent diffusion coefficient (ADC) in the brain of rats chronically exposed to lead acetate

AuthorsLópez-Larrubia, Pilar ; Cauli, Omar
KeywordsLead neurotoxicity
Vasogenic oedema
Blood–brain barrier
Reticular formation
Apparent diffusion coefficient
Magnetic resonance imaging
Issue Date15-Mar-2010
PublisherElsevier
CitationToxicology 281(1-3): 1-6 (2011)
AbstractDiffusion-weighted imaging (DWI) allows the assessment of the water apparent diffusion coefficient (ADC), a measure of tissue water diffusivity which is altered during different pathological conditions such as cerebral oedema. By means of DWI, we repeatedly measured in the same rats apparent diffusion coefficient ADC in different brain areas (motor cortex (MCx), somato-sensory cortex (SCx), caudate-putamen (CPu), hippocampus (Hip), mesencephalic reticular formation (RF), corpus callosum (CC) and cerebellum (Cb)) after 1 week, 4 and 12 weeks of lead acetate exposure via drinking water (50 or 500ppm). After 12 weeks of lead exposure rats received albumin-Evans blue complex administration and were sacrified 1h later. Blood-brain barrier permeability and water tissue content were determined in order to evaluate their relationship with ADC changes. Chronic exposure to lead acetate (500ppm) for 4 weeks increased ADC values in Hip, RF and Cb but no in other brain areas. After 12 weeks of lead acetate exposure at 500ppm ADC is significantly increased also in CPu and CC. Brain areas displaying high ADC values after lead exposure showed also an increased water content and increased BBB permeability to Evans blue-albumin complex. Exposure to 50ppm for 12 weeks increased ADC values and BBB permeability in the RF and Cb. In summary, chronic lead exposure induces cerebral oedema in the adult brain depending on the brain area and the dose of exposure. RF and Cb appeared the most sensitive brain areas whereas cerebral cortex appears resistant to lead-induced cerebral oedema.
Publisher version (URL)http://dx.doi.org/10.1016/j.tox.2010.12.009
URIhttp://hdl.handle.net/10261/32766
DOI10.1016/j.tox.2010.12.009
ISSN0300-483X
Appears in Collections:(IIBM) Artículos
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