Subcellular localization of Patched and Smoothened, the receptors for Sonic hedgehog signaling, in the hippocampal neuron.

Subcellular localization of Patched and Smoothened, the receptors for Sonic hedgehog signaling, in the hippocampal neuron.
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DOI:
10.1002/cne.22681
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发表时间:
2011-12-15
影响因子:
2.5
通讯作者:
Yao, Pamela J.
Yao, Pamela J.
中科院分区:
医学3区
文献类型:
--
作者:
Petralia, Ronald S.;Schwartz, Catherine M.;Wang, Ya-Xian;Mattson, Mark P.;Yao, Pamela J.

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累积的证据表明,除了形成胚胎神经管的模式外,Sonic hedgehog(Shh)信号在成熟的神经系统中发挥着重要作用。在本研究中,我们研究了Shh信号受体Patched(Ptch)和Smoothened(Smo)在幼年和成熟大鼠海马神经元中的表达和定位。逆转录-聚合酶链式反应和免疫印迹分析表明,Ptch和Smo在幼年、出生后和成年脑中的表达保持在中等水平。通过免疫荧光光学显微镜和免疫电子显微镜,我们研究了Ptch和Smo在海马神经元中的空间分布。在发育中的年轻神经元中,Ptch和Smo存在于突起中,并聚集在它们的生长锥体上。在成熟神经元中,Ptch和Smo集中在树突、棘突和突触后部位。突触的Ptch和Smo经常与不寻常的结构共存--突触的棘突和自噬小体。我们的结果揭示了Shh受体在年轻和成熟的海马神经元中的解剖结构。
Cumulative evidence suggests that, aside from patterning the embryonic neural tube, Sonic hedgehog (Shh) signaling plays important roles in the mature nervous system. In this study, we investigate the expression and localization of the Shh signaling receptors, Patched (Ptch) and Smoothened (Smo), in the hippocampal neurons of young and mature rats. Reverse transcriptase-polymerase chain reaction and immunoblotting analyses show that the expression of Ptch and Smo remains at a moderate level in young postnatal and adult brains. By using immunofluorescence light microscopy and immunoelectron microscopy, we examine the spatial distribution of Ptch and Smo within the hippocampal neurons. In young developing neurons, Ptch and Smo are present in the processes and are clustered at their growth cones. In mature neurons, Ptch and Smo are concentrated in dendrites, spines, and postsynaptic sites. Synaptic Ptch and Smo often co-exist with unusual structures—synaptic spinules and autophagosomes. Our results reveal the anatomical organization of the Shh receptors within both the young and the mature hippocampal neurons.
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