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Eur J Nucl Med Mol Imaging. 2012 Sep;39(9):1462-6. doi: 10.1007/s00259-012-2162-4. Epub 2012 Jun 19.

Decline in prefrontal catecholamine synthesis explains age-related changes in cognitive speed beyond regional grey matter atrophy.

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  • 1Department of Psychiatry and Psychotherapy, Campus Mitte, Charit√© - Universit√§tsmedizin Berlin, Charit√©platz 1, 10117 Berlin, Germany. jan.kalbitzer@charite.de

Abstract

PURPOSE:

Age-related decline in cognitive speed has been associated with prefrontal dopamine D1 receptor availability, but the contribution of presynaptic dopamine and noradrenaline innervation to age-related changes in cognition is unknown.

METHODS:

In a group of 16 healthy participants aged 22-61 years, we used PET and the radioligand FDOPA to measure catecholamine synthesis capacity (K (in) (app); millilitres per gram per minute) and the digit symbol substitution test to measure cognitive speed, a component of fluid IQ.

RESULTS:

Cognitive speed was associated with the magnitude of K (in) (app) in the prefrontal cortex (p < 0.0005). Both cognitive speed (p = 0.003) and FDOPA K (in) (app) (p < 0.0005) declined with age, both in a standard voxel-wise analysis and in a volume-of-interest analysis with partial volume correction, and the correlation between cognitive speed and K (in) (app) remained significant beyond the effects of age (p = 0.047). MR-based segmentation revealed that these age-related declines were not attributable to age-related alterations in grey matter density.

CONCLUSION:

Our findings indicate that age-related changes in the capacity of the prefrontal cortex to synthesize catecholamines, irrespective of cortical atrophy, may underlie age-related decline in cognitive speed.

[PubMed - indexed for MEDLINE]
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