Thinning brain areas and high levels of C-reactive protein indicate cognitive decline
April 14, 2011
Researchers in two studies have found two biomarkers of cognitive decline: thinner brain areas associated with Alzheimer’s and high levels of C-reactive protein.
Researchers from Rush University Medical Center and Massachusetts General Hospital (MGH) have found that the risk of developing Alzheimer’s was three times greater for individuals for whom areas of the cerebral cortex associated with Alzheimer’s in previous studies were thinnest, compared to those with above-average thickness.
The study analyzed data from participants who were cognitively normal at the outset and had at least four follow-up visits. The group included 50 participants who remained cognitively normal at the end of the study period, and 15 who had developed Alzheimer’s over an average time span of about nine years. In both study groups, the baseline magnetic resonance (MR) images revealed that areas of the cerebral cortex associated with Alzheimer’s in previous studies tended to be thinner in participants who went on to develop dementia.
Among those with these thinnest signature brain areas, 55 percent developed dementia during the study period, compared with 20 percent of those with average cortical thickness and none of those in whom cortical thickness was above average. Participants with the thinnest cortical areas also developed Alzheimer’s significantly faster than those with average thickness.
A second study by researchers at the University of California, San Francisco (UCSF), has shown that high levels of C-reactive protein (CRP), a marker of chronic low grade inflammation in the brain, correlate with aspects of memory decline in otherwise cognitively normal older adults.
The scientists in the study hypothesized that the presence of CRP would be associated with poorer memory creation and smaller medial-temporal lobes, which include the hippocampus.
They examined 76 women and men (mean age 71.8) with detectible levels of CRP in their blood, and 65 people (mean age 70.8) with undetectable levels. All participants were given a 16-word list learning task to measure verbal recall, and underwent magnetic resonance imaging (MRI) to measure volumes of regions of the medial temporal lobes, specifically the hippocampus, entorhinal cortex, and parahippocampal cortex.
The results showed that adults with measureable levels of CRP recalled fewer words and had smaller medial temporal lobes.
Source: http://goo.gl/Fknk7
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