Circadian trafficking of calbindin-ir in fibers of SCN neurons.

Circadian trafficking of calbindin-ir in fibers of SCN neurons.
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DOI:
10.1177/0748730409350876
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发表时间:
2009-12
影响因子:
3.5
通讯作者:
Silver R
Silver R
中科院分区:
生物学3区
文献类型:
--
作者:
LeSauter J;Bhuiyan T;Shimazoe T;Silver R

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含有 Calbindin-D28K (CalB) 的细胞在仓鼠视交叉上核 (SCN) 的核心内形成一个独特的簇。这些细胞是直接视网膜受体,但在时钟基因表达或电活动方面缺乏可检测的节律。在使用双标记免疫化学探索 SCN 连接性的研究中,我们之前报告称,在白天处死的动物中,CalB 纤维和加压素 (VP) 细胞之间没有接触。在这里,我们探讨了 CalB 免疫反应性 (-ir) 的昼夜节律变化,并在时间时间 (ZT) 4 和 14 重新检查了 CalB 与其他 SCN 细胞类型之间的联系。结果揭示了 SCN 细胞纤维中 CalB-ir 的昼夜节律,在夜间和主观夜间高表达,在白天和主观白天低表达。在研究的其他大脑区域中没有发现这种昼夜节律差异。夜间 CalB 纤维和 VP 细胞之间的接触量明显多于白天,而 CalB 纤维和 VIP、CCK 或 GRP 细胞之间的接触次数没有观察到昼夜节律变化。任何肽能纤维类型在 CalB 细胞上的并置均未检测到变化。目前的研究结果表明,CalB 细胞以时间门控方式将光信息传递给 SCN 壳的 VP 振荡器细胞。
Calbindin-D28K (CalB) containing cells form a distinct cluster within the core of the hamster suprachiasmatic nucleus (SCN). These cells are directly retinorecipient but lack detectable rhythms in clock gene expression or electrical activity. In studies exploring SCN connectivity using double-label immunochemistry, we previously reported an absence of contacts among CalB fibers and vasopressin (VP) cells in animals sacrificed during the day. Here we explored circadian variations in CalB-immunoreactivity (-ir) and re-examined the connections between CalB and other SCN cell types at zeitgeber time (ZT) 4 and 14. The results reveal a circadian rhythm of CalB-ir in fibers of SCN cells with high expression during the night and subjective night and low expression during the day and subjective day. This circadian difference is not seen in the other brain regions studied. Significantly more appositions were detected between CalB fibers and VP cells during the night than during the day, while circadian variation in numbers of contacts was not seen between CalB fibers and VIP, CCK or GRP cells. There was no detectable variation in appositions from any peptidergic fiber type onto CalB cells. The present findings suggest that CalB cells relay photic information to VP oscillator cells of the SCN shell in a temporally gated manner.
DOI: 10.1016/s0306-4522(97)00632-5
发表时间: 1998-07-01
期刊: NEUROSCIENCE
影响因子: 3.3
作者:
Klapstein, GJ;Vietla, S;Mody, I
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发表时间: 2002-01-01
期刊: NEUROSCIENCE
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影响因子: 3.4
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发表时间: 1996-02-05
期刊: BRAIN RESEARCH
影响因子: 2.9
作者:
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DOI: 10.1046/j.1460-9568.2002.02309.x
发表时间: 2002-12-01
影响因子: 3.4
作者:
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通讯作者: Allen, CN