Clinical NeuroscienceResearch PaperAge-related reduction in dopamine D1 receptors in the human brain: from late childhood to adulthood, a positron emission tomography study
Section snippets
Subjects
The study was approved by the Research Ethics and the Radiation Safety Committees of the Karolinska University Hospital, Solna, Sweden. Participation in the study was voluntary and the subjects agreed to participate after receiving written and oral information. Written informed consent was obtained from the subjects and/or their parents in accordance with the Declaration of Helsinki. The study was carried out at the PET Centre, Department of Clinical Neuroscience, Karolinska Institutet.
The
Results
In the present cross-sectional study regional BPs were calculated for [11C]SCH23390 binding to D1DR in 24 brain regions (including both hemispheres) of 30 subjects. The relationship between age and BP in representative cortical and striatal regions is visualized in Fig. 1. [11C]SCH23390 binding to the D1DR declined in all cortical and striatal regions over the investigated age span (10–30 years). There was no asymmetry in radioligand binding for any region. Subsequent analyses were done on
Discussion
To our knowledge, this is the first examination of the age effect on a neurotransmission biomarker in vivo during adolescence. In adults, age-related decline in D1DR density has been reported in the post-mortem brain (de Kayser et al., 1990) and in PET studies in vivo (Suhara et al., 1991, Wang et al., 1998), with the rate of decline being in the range of 4–9% per decade. In the present PET-study on D1DR binding we found an overall age dependent decline of the BPs also in adolescence.
The age
Conclusion
The study results suggest that D1DR binding declines in a non-linear mode during transition from adolescence to adulthood. Decline in cortical D1DR BP was age segment-dependent, with most pronounced BP decline during adolescence. In addition, D1DR BP decline was brain region-specific: rates of BP reduction varied between brain regions about 10-fold, from highest in the frontal, occipital cortices and lowest in the ventral striatum. The present PET-study illustrates the importance of
Acknowledgments
The authors thank members of the Stockholm PET group for technical assistance, in particular Kjerstin Lind, Johan Mohlin for contribution in data collection. The study was supported by grants from the Swedish Research Council (Project 05925 and 09114). JA was sponsored by the Sällskapet Barnavård Foundation.
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