Control of interneuron dendritic growth through NRG1/erbB4-mediated kalirin-7 disinhibition.

Control of interneuron dendritic growth through NRG1/erbB4-mediated kalirin-7 disinhibition.
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DOI:
10.1038/mp.2011.35
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发表时间:
2012-01
影响因子:
11
通讯作者:
Penzes, P.
Penzes, P.
中科院分区:
医学1区
文献类型:
--
作者:
Cahill, M. E.;Jones, K. A.;Rafalovich, I.;Xie, Z.;Barros, C. S.;Mueller, U.;Penzes, P.
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神经调节蛋白1(NRG 1)是一种分泌的营养因子,其激活突触后erbB 4受体酪氨酸激酶。NRG 1和erbB 4都被反复与精神分裂症相关,但它们的下游靶点还没有得到很好的表征。ErbB 4在中间神经元中高度丰富,并且NRG 1介导的ErbB 4活化已显示出调节中间神经元功能,但NRG 1-ErbB 4信号传导在调节中间神经元树突生长中的作用尚不清楚。在这里,我们表明,NRG 1/erbB 4促进成熟的中间神经元树突的生长,通过卡林,一个主要的树突Rac 1-GEF。最近的研究表明KALRN基因与精神分裂症有关。我们的数据指出,在kalirin-7的C-末端的磷酸化作为这些效果的关键部位的重要作用。由于精神分裂症患者中间神经元树突长度减少,了解NRG 1-erbB 4信号如何调节中间神经元树突形态发生可能有助于阐明皮质回路中与疾病相关的改变。
Neuregulin 1 (NRG1) is a secreted trophic factor that activates the postsynaptic erbB4 receptor tyrosine kinase. Both NRG1 and erbB4 have been repeatedly associated with schizophrenia, but their downstream targets are not well characterized. ErbB4 is highly abundant in interneurons, and NRG1-mediated erbB4 activation has been shown to modulate interneuron function, but the role for NRG1-erbB4 signaling in regulating interneuron dendritic growth is not well understood. Here we show that NRG1/erbB4 promote the growth of dendrites in mature interneurons through kalirin, a major dendritic Rac1-GEF. Recent studies have shown associations of the KALRN gene with schizophrenia. Our data point to an essential role of phosphorylation in kalirin-7’s C-terminus as the critical site for these effects. As reduced interneuron dendrite length occurs in schizophrenia, understanding how NRG1-erbB4 signaling modulates interneuron dendritic morphogenesis might shed light on disease-related alterations in cortical circuits.
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