相关实验视频
Updated: Jun 29, 2026
08:30
Operant Procedures for Assessing Behavioral Flexibility in Rats
Published on: February 15, 2015
20.8K
在第二个产后周内抑制条状间接通路会导致长期的动机行为缺陷
Pedro R Olivetti1,2, Arturo Torres-Herraez1,2, Meghan E Gallo1,2
1Department of Psychiatry, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA.
概括
改变多巴胺D2受体信号传递在关键的早期大脑发育时期在小鼠造成持久的动机和行为缺陷. 这突显了条状多巴胺功能的敏感发育窗口.
科学领域:
- 神经科学是一个神经科学.
- 发展生物学 发展生物学
- 精神病学是一个精神病学.
背景情况:
- 精神分裂症是一种神经精神疾病,怀疑其起源于神经发育.
- 研究表明,精神分裂症患者的条纹体中多巴胺和D2受体活性发生变化.
- 产后条状多巴胺改变对大脑功能和行为的长期影响仍然不清楚.
研究的目的:
- 调查在特定的产后期操纵条状多巴胺D2受体 (D2R) 信号传递对成年大脑功能和行为的影响.
- 确定生命早期的D2R变化是否可以诱导与神经精神疾病相关的持久变化.
主要方法:
- 利用设计者受体来激活抑制性Gi-蛋白信号,模仿小鼠状体中的D2R高功能.
- 在一个定义的产后窗口 (8-15天) 中对焦操纵.
- 在成年小鼠中评估了长期的行为结果 (运动和动机行为) 和体内多巴胺信号.
主要成果:
- 通过Gi介导信号的间接途径的产后抑制导致成年小鼠的运动和动机行为持续减少.
- 成年小鼠表现出结果唤起的多巴胺水平的模糊适应,以应对不同的努力需求.
- 这些发现将早期的D2R信号与长期的条纹功能和动机行为缺陷联系起来.
结论:
- 对于D2R调节的条形状发育,存在一个敏感的发育窗口.
- D2R信号的早期改变可能对神经元功能和行为产生深刻而持久的影响.
- 这项研究提供了关于神经发育机制的见解,这些机制是神经精神疾病相关的行为缺陷的基础.
相关概念视频
00:46Feedback Inhibition
Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
01:05Long-term Depression
Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
01:03Long-term Depression
Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
If over time, all...
Calcium Ion Concentration Mechanism
If over time, all...
01:07Teratogenicity
The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
01:20Desensitization and Tachyphylaxis
Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
Several...
Several...
01:25Secondary Spinal Cord Injury llI: Pathophysiology
Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...