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Differential regional decline in dopamine receptor availability across adulthood: Linear and nonlinear effects of age.

Publication ,  Journal Article
Seaman, KL; Smith, CT; Juarez, EJ; Dang, LC; Castrellon, JJ; Burgess, LL; San Juan, MD; Kundzicz, PM; Cowan, RL; Zald, DH; Samanez-Larkin, GR
Published in: Human brain mapping
July 2019

Theories of adult brain development, based on neuropsychological test results and structural neuroimaging, suggest differential rates of age-related change in function across cortical and subcortical sub-regions. However, it remains unclear if these trends also extend to the aging dopamine system. Here we examined cross-sectional adult age differences in estimates of D2-like receptor binding potential across several cortical and subcortical brain regions using PET imaging and the radiotracer [18 F]Fallypride in two samples of healthy human adults (combined N = 132). After accounting for regional differences in overall radioligand binding, estimated percent difference in receptor binding potential by decade (linear effects) were highest in most temporal and frontal cortical regions (~6-16% per decade), moderate in parahippocampal gyrus, pregenual frontal cortex, fusiform gyrus, caudate, putamen, thalamus, and amygdala (~3-5%), and weakest in subcallosal frontal cortex, ventral striatum, pallidum, and hippocampus (~0-2%). Some regions showed linear effects of age while many showed curvilinear effects such that binding potential declined from young adulthood to middle age and then was relatively stable until old age. Overall, these data indicate that the rate and pattern of decline in D2 receptor availability is regionally heterogeneous. However, the differences across regions were challenging to organize within existing theories of brain development and did not show the same pattern of regional change that has been observed in gray matter volume, white matter integrity, or cognitive performance. This variation suggests that existing theories of adult brain development may need to be modified to better account for the spatial dynamics of dopaminergic system aging.

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Published In

Human brain mapping

DOI

EISSN

1097-0193

ISSN

1065-9471

Publication Date

July 2019

Volume

40

Issue

10

Start / End Page

3125 / 3138

Related Subject Headings

  • Young Adult
  • Receptors, Dopamine D3
  • Receptors, Dopamine D2
  • Positron-Emission Tomography
  • Models, Statistical
  • Middle Aged
  • Male
  • Magnetic Resonance Imaging
  • Humans
  • Female
 

Citation

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Seaman, K. L., Smith, C. T., Juarez, E. J., Dang, L. C., Castrellon, J. J., Burgess, L. L., … Samanez-Larkin, G. R. (2019). Differential regional decline in dopamine receptor availability across adulthood: Linear and nonlinear effects of age. Human Brain Mapping, 40(10), 3125–3138. https://doi.org/10.1002/hbm.24585
Seaman, Kendra L., Christopher T. Smith, Eric J. Juarez, Linh C. Dang, Jaime J. Castrellon, Leah L. Burgess, M Danica San Juan, et al. “Differential regional decline in dopamine receptor availability across adulthood: Linear and nonlinear effects of age.Human Brain Mapping 40, no. 10 (July 2019): 3125–38. https://doi.org/10.1002/hbm.24585.
Seaman KL, Smith CT, Juarez EJ, Dang LC, Castrellon JJ, Burgess LL, et al. Differential regional decline in dopamine receptor availability across adulthood: Linear and nonlinear effects of age. Human brain mapping. 2019 Jul;40(10):3125–38.
Seaman, Kendra L., et al. “Differential regional decline in dopamine receptor availability across adulthood: Linear and nonlinear effects of age.Human Brain Mapping, vol. 40, no. 10, July 2019, pp. 3125–38. Epmc, doi:10.1002/hbm.24585.
Seaman KL, Smith CT, Juarez EJ, Dang LC, Castrellon JJ, Burgess LL, San Juan MD, Kundzicz PM, Cowan RL, Zald DH, Samanez-Larkin GR. Differential regional decline in dopamine receptor availability across adulthood: Linear and nonlinear effects of age. Human brain mapping. 2019 Jul;40(10):3125–3138.
Journal cover image

Published In

Human brain mapping

DOI

EISSN

1097-0193

ISSN

1065-9471

Publication Date

July 2019

Volume

40

Issue

10

Start / End Page

3125 / 3138

Related Subject Headings

  • Young Adult
  • Receptors, Dopamine D3
  • Receptors, Dopamine D2
  • Positron-Emission Tomography
  • Models, Statistical
  • Middle Aged
  • Male
  • Magnetic Resonance Imaging
  • Humans
  • Female