Chondroitin sulfate proteoglycan phosphacan/RPTPβ in the hypothalamic magnocellular nuclei

Chondroitin sulfate proteoglycan phosphacan/RPTPβ in the hypothalamic magnocellular nuclei
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下丘脑大细胞核中的硫酸软骨素蛋白聚糖磷酸聚糖/RPTPβ

DOI:
10.1016/s0006-8993(02)02971-2
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发表时间:
2002
期刊:
影响因子:
2.9
通讯作者:
A. Oohira
A. Oohira
中科院分区:
医学3区
文献类型:
--
作者:
S. Miyata;Ichiro Shinga;K. Taguchi;T. Nakashima;T. Kiyohara;A. Oohira

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下丘脑-神经垂体系统在生理刺激下合成并释放精氨酸抗利尿激素(AVP)和催产素(OXT)。在本研究中,我们在光镜和电镜水平上研究了硫酸软骨素蛋白聚糖(CSPG),磷酸根/RPTPβ在成年大鼠视上核(SON)和室旁核(PVN)中的定位。免疫组织化学分析显示,与邻近下丘脑区相比,SON和PVN内的磷酸腺苷/RPTPβ免疫反应性更强。双标记实验显示,磷脂/RPTPβ的免疫反应性在分泌AVP和oxt的大细胞神经元的体细胞和树突周围形成点状网络。电镜检查进一步发现,在SON的一些轴突、体细胞和树突的细胞膜外表面有较强的磷蛋白/RPTPβ免疫反应性,但在突触连接处没有。有趣的是,在星形细胞突起和神经元之间的细胞外表面膜上也观察到磷酸腺苷/RPTPβ的免疫反应性,而不是在大细胞神经元之间。本研究结果表明,在下丘脑分泌AVP和oxt的大细胞神经元中,CSPG、磷酸甘氨酸/RPTPβ在胞外空间高表达。
The hypothalamo–neurohypophysial system synthesizes and releases arginine vasopressin (AVP) and oxytocin (OXT) with physiological stimulation. In the present study, we investigated localization of a chondroitin sulfate proteoglycan (CSPG), phosphacan/RPTPβ, in the supraoptic nucleus (SON) and paraventricular nucleus (PVN) of adult rats at both the light and electron microscopic levels. Immunohistochemical analyses demonstrated stronger phosphacan/RPTPβ immunoreactivity within the SON and PVN compared with adjacent hypothalamic areas. Double labeling experiments showed phosphacan/RPTPβ immunoreactivity constituting punctate networks to surround the somata and dendrites of AVP- and OXT-secreting magnocellular neurons. Electron microscopic examination further revealed strong phosphacan/RPTPβ immunoreactivity at extracellular membrane surface of some axons, somata, and dendrites of the SON, but not of synaptic junctions. Interestingly, phosphacan/RPTPβ immunoreactivity was also observed at extracellular surface membrane between astrocytic processes and neurons rather than between magnocellular neurons. The present results indicate the high expression of the CSPG, phosphacan/RPTPβ at the extracellular space in the hypothalamic AVP- and OXT-secreting magnocellular neurons.
DOI: 10.1016/0012-1606(90)90203-u
发表时间: 1990-04
影响因子: 2.7
作者:
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通讯作者: Diane M. Snow;Dennis A. Steindler;Jerry Silver
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DOI: --
发表时间: 1994
期刊: The Journal of biological chemistry
影响因子: --
作者:
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DOI: --
发表时间: 1996
期刊: Perspectives on developmental neurobiology
影响因子: --
作者:
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