Title
New insights into central roles of cerebral oxygen metabolism in the resting and stimulus-evoked brain
UMMS Affiliation
Department of Psychiatry
Date
1-2009
Document Type
Article
Medical Subject Headings
Animals; Brain; Cats; Female; Magnetic Resonance Imaging; Oxygen
Disciplines
Psychiatry
Abstract
The possible role of oxygen metabolism in supporting brain activation remains elusive. We have used a newly developed neuroimaging approach based on high-field in vivo (17)O magnetic resonance spectroscopic (MRS) imaging to noninvasively image cerebral metabolic rate of oxygen (CMRO(2)) consumption in cats at rest and during visual stimulation. It was found that CMRO(2) increases significantly (32.3%+/-10.8%, n=6) in the activated visual cortical region as depicted in blood oxygenation level dependence functional maps; this increase is also accompanied by a CMRO(2) decrease in surrounding cortical regions, resulting a smaller increase (9.7%+/-1.9%) of total CMRO(2) change over a larger cortical region displaying either a positive or negative CMRO(2) alteration. Moreover, a negative correlation between stimulus-evoked percent CMRO(2) increase and resting CMRO(2) was observed, indicating an essential impact of resting brain metabolic activity level on stimulus-evoked percent CMRO(2) change and neuroimaging signals. These findings provide new insights into the critical roles of oxidative metabolism in supporting brain activation and function. They also suggest that in vivo (17)O MRS imaging should provide a sensitive neuroimaging modality for mapping CMRO(2) and its change induced by brain physiology and/or pathologic alteration.
Rights and Permissions
Citation: J Cereb Blood Flow Metab. 2009 Jan;29(1):10-8. Epub 2008 Sep 10. Link to article on publisher's site
