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Striatal phosphodiesterase 10A availability is altered secondary to chronic changes in dopamine neurotransmission.
EJNMMI Radiopharmacy and Chemistry Pub Date : 2016-03-21 , DOI: 10.1186/s41181-016-0005-5
Maarten Ooms 1 , Sofie Celen 1 , Ronald De Hoogt 2 , Ilse Lenaerts 2 , Johnny Liebregts 2 , Greet Vanhoof 2 , Xavier Langlois 2 , Andrey Postnov 3 , Michel Koole 3 , Alfons Verbruggen 1 , Koen Van Laere 3 , Guy Bormans 1
Affiliation  

Phosphodiesterase 10A (PDE10A) is an important regulator of nigrostriatal dopamine (DA) neurotransmission. However, little is known on the effect of alterations in DA neurotransmission on PDE10A availability. Here, we used [18F]JNJ42259152 PET to measure changes in PDE10A availability, secondary to pharmacological alterations in DA release and to investigate whether these are D1- or D2-receptor driven. Acute treatment of rats using D-amphetamine (5 mg, s.c. and 1 mg/kg i.v.) did not result in a significant change in PDE10A BPND compared to baseline conditions. 5-day D-amphetamine treatment (5 mg/kg, s.c.) increased striatal PDE10A BPND compared to the baseline (+24 %, p = 0.03). Treatment with the selective D2 antagonist SCH23390 (1 mg/kg) and D-amphetamine decreased PDE10A binding (-22 %, p = 0.03). Treatment with only SCH23390 further decreased PDE10A binding (-26 %, p = 0.03). No significant alterations in PDE10A mRNA levels were observed. Repeated D-amphetamine treatment significantly increased PDE10A binding, which is not observed upon selective D1 receptor blocking. This study suggests a potential pharmacological interaction between PDE10A enzymes and drugs modifying DA neurotransmission. Therefore, PDE10A binding in patients with neuropsychiatric disorders might be modulated by chronic DA-related treatment.

中文翻译:

纹状体磷酸二酯酶 10A 的可用性继发于多巴胺神经传递的慢性变化。

磷酸二酯酶 10A (PDE10A) 是黑质纹状体多巴胺 (DA) 神经传递的重要调节剂。然而,关于 DA 神经传递的改变对 PDE10A 可用性的影响知之甚少。在这里,我们使用 [18F]JNJ42259152 PET 来测量 PDE10A 可用性的变化,继发于 DA 释放的药理学变化,并研究这些是否是 D1 或 D2 受体驱动的。与基线条件相比,使用 D-苯丙胺(5 mg、sc 和 1 mg/kg iv)对大鼠进行急性治疗不会导致 PDE10A BPND 发生显着变化。与基线相比,5 天 D-苯丙胺治疗(5 mg/kg,sc)增加了纹状体 PDE10A BPND(+24 %,p = 0.03)。用选择性 D2 拮抗剂 SCH23390 (1 mg/kg) 和 D-苯丙胺治疗降低了 PDE10A 结合 (-22 %, p = 0.03)。仅用 SCH23390 处理进一步降低了 PDE10A 结合(-26 %,p = 0.03)。未观察到 PDE10A mRNA 水平的显着变化。重复 D-苯丙胺治疗显着增加了 PDE10A 结合,这在选择性 D1 受体阻断时未观察到。该研究表明 PDE10A 酶与修饰 DA 神经传递的药物之间存在潜在的药理相互作用。因此,神经精神疾病患者的 PDE10A 结合可能受到慢性 DA 相关治疗的调节。该研究表明 PDE10A 酶与修饰 DA 神经传递的药物之间存在潜在的药理相互作用。因此,神经精神疾病患者的 PDE10A 结合可能受到慢性 DA 相关治疗的调节。该研究表明 PDE10A 酶与修饰 DA 神经传递的药物之间存在潜在的药理相互作用。因此,神经精神疾病患者的 PDE10A 结合可能受到慢性 DA 相关治疗的调节。
更新日期:2016-03-21
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