Effects of Maturation on Striatal Dopamine Transporter Availability in Rats

Seunghyeon Shin; Keunyoung Kim; Kyoungjune Pak; Hyun-Yeol Nam; Seong-Jang Kim; In Joo Kim

doi:10.1055/a-0981-5709

Nuklearmedizin - NuclearMedicine, Table of Contents

Nuklearmedizin 2019; 58(05): 395-400
DOI: 10.1055/a-0981-5709

Original Article

Effects of Maturation on Striatal Dopamine Transporter Availability in Rats

Auswirkungen der Reifung auf die Verfügbarkeit von striatalen Dopamintransportern bei Ratten

Seunghyeon Shin

¹Department of Nuclear Medicine, Samsung Changwon Hospital, Changwon, Republic of Korea

,

Keunyoung Kim

²Dept. of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital and School of Medicine, Pusan National University, Busan, Republic of Korea

,

Kyoungjune Pak

²Dept. of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital and School of Medicine, Pusan National University, Busan, Republic of Korea

,

Hyun-Yeol Nam

¹Department of Nuclear Medicine, Samsung Changwon Hospital, Changwon, Republic of Korea

,

Seong-Jang Kim

³Department of Nuclear Medicine and Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea

,

In Joo Kim

²Dept. of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital and School of Medicine, Pusan National University, Busan, Republic of Korea

› Author Affiliations

Abstract

Objectives We investigated the effects of maturation on dopamine transporter (DAT) availability in the rat via longitudinal monitoring with positron emission tomography (PET).

Methods Eight 5-week-old male Sprague-Dawley rats (113–186 g) were used. Four ¹⁸F-FP-CIT PET scans were taken at 5, 10, 15, and 20 weeks. Baseline PET images were manually fused with the built-in magnetic resonance imaging template; volumes of interest (VOIs) were manually defined by placing a spherical region around the hot spot with the maximum count rate. VOIs were placed on bilateral caudate and putamen (CPu), nucleus accumbens (NAc), and cerebellum. Specific binding ratios (SBRs) were calculated as follows: (mean uptake of bilateral targets – mean uptake of bilateral cerebellum)/(mean uptake of bilateral cerebellum).

Results In CPu, SBRs at 5 weeks (3.25 ± 0.66) were lower than those at 10 weeks (4.59 ± 0.78, p = 0.1151) and at 15 weeks (5.56 ± 0.92, p = 0.0182). In NAc, SBRs at 5 weeks (1.41 ± 0.47) were lower than those at 10 weeks (2.03 ± 0.36, p = 0.1960) and at 15 weeks (2.43 ± 0.50, p = 0.0427). SBRs in CPu and NAc significantly increased with maturation until 15 weeks. However, differences in SBR between 15 and 20 weeks were not significant.

Conclusions Striatal DAT availability increases until 15 weeks postnatally, then remains stable, reflecting maturation of the dopaminergic system in rats.

Zusammenfassung

Ziele Wir untersuchten die Auswirkungen der Reifung auf die Verfügbarkeit von Dopamintransportern (DAT) in der Ratte durch longitudinale Beobachtung mit Positronen-Emissions-Tomografie (PET).

Methoden Es wurden acht 5 Wochen alte männliche Sprague-Dawley-Ratten (113–186 g) verwendet. Vier 18F-FP-CIT PET-Aufnahmen wurden nach 5, 10, 15 und 20 Wochen durchgeführt. Die PET-Bilder zu Studienbeginn wurden manuell mit dem eingebauten Magnetresonanztomografie-Template fusioniert. Volumes of Interest (VOIs) wurden manuell definiert, indem ein sphärischer Bereich mit der maximalen Zählrate um den Hotspot gelegt wurde. VOIs wurden auf den bilateralen Caudatus und Putamen (CPu), Nucleus accumbens (NAc) und das Kleinhirn gelegt. Die spezifischen Bindungsratios (SBRs) wurden wie folgt berechnet: (mittlere Aufnahme der bilateralen Ziele – mittlere Aufnahme des bilateralen Kleinhirns)/(mittlere Aufnahme des bilateralem Kleinhirn).

Ergebnisse Im CPu waren die SBRs nach 5 Wochen (3,25 ± 0,66) niedriger als nach 10 Wochen (4,59 ± 0,78, p = 0,1151) und nach 15 Wochen (5,56 ± 0,92, p = 0,0182). Im NAc waren die SBRs nach 5 Wochen (1,41 ± 0,47) niedriger als nach 10 Wochen (2,03 ± 0,36, p = 0,1960) und nach 15 Wochen (2,43 ± 0,50, p = 0,0427). Die SBRs in CPu und NAc nahmen mit der Reifung bis 15 Wochen signifikant zu. Allerdings waren die Unterschiede in der SBR zwischen 15 und 20 Wochen nicht signifikant.

Schlussfolgerungen Die Verfügbarkeit von striatalen DAT steigt bis 15 Wochen nach der Geburt an und bleibt dann stabil, was die Reifung des dopaminergen Systems bei Ratten widerspiegelt.

Key words

Positron emission tomography - Aging - Dopamine transporter

Schlüsselwörter

Positronen-Emissions-Tomografie - Alterung - Dopamintransporter

Full Text

References

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