通过 Nrg1 和 ErbB4 信号来控制皮层 GABA 电路的发展
Pietro Fazzari1, Ana V Paternain, Manuel Valiente
1Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas & Universidad Miguel Hernández, 03550 Sant Joan d'Alacant, Spain.
Nature
|April 16, 2010
概括
神经调节蛋白1 (NRG1) 和ERBB4信号传递对于发展大脑抑制电路至关重要. 这项研究揭示了它们在形成含有GABA (氨酸) 的内部神经元连接中的作用,为精神分裂症遗传学提供了新的见解.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 精神分裂症是一种复杂的神经发育障碍,具有强大的遗传基础.
- 神经调节蛋白1 (NRG1) 和它的受体ERBB4被认为是风险基因,但它们在疾病中的确切功能尚不清楚.
研究的目的:
- 研究神经调节1 (NRG1) 和ERBB4信号在神经回路的发展中的作用.
- 阐明ERBB4在哺乳动物大脑中的特定细胞和突触功能.
主要方法:
- 使用了 in vitro 和 in vivo 的功能增益和丧失实验.
- 研究了小鼠新皮质和海马体中的ERBB4表达模式.
- 研究了含有GABA (氨酸) 的内部神经元的突触连接性.
主要成果:
- ERBB4主要表达在特定的内部神经元群体中,包括表达parvalbumin的吊灯和篮细胞.
- NRG1-ERBB4信号传递细胞-自主调节在金字塔细胞上抑制性轴突突突触的形成.
- 内部神经元中的ERBB4信号也会影响这些细胞的刺激性突触形成,但不是金字塔神经元之间.
结论:
- NRG1和ERBB4信号传输对于在产后皮层中GABA (胺黄油酸) 介导的抑制电路的正确连接至关重要.
- 这些发现为NRG1和ERBB4参与精神分裂症神经发育起源提供了新的视角.
相关概念视频
01:09GPCRs Regulate Adenylyl Cylase Activity
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
Two...
01:22Activation and Inactivation of G Proteins
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...