Dendrite-associated opioid-binding cell adhesion molecule localizes at neurosecretory granules in the hypothalamic magnocellular neurons
Dendrite-associated opioid-binding cell adhesion molecule localizes at neurosecretory granules in the hypothalamic magnocellular neurons
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树突相关的阿片结合细胞粘附分子定位于下丘脑大细胞神经元的神经分泌颗粒
DOI：
10.1016/s0306-4522(03)00609-2
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发表时间：
2003
期刊：
影响因子：
3.3
通讯作者：
Shohei Maekawa
中科院分区：
文献类型：
--
作者：
Seiji Miyata;K. Taguchi;Shohei Maekawa
Opioid-binding cell adhesion molecule (OBCAM) is a member of the immunoglobulin superfamily containing limbic system-associated membrane protein (IgLON) subgroup of glycosylphosphatidylinositol-anchored immunoglobulin cell adhesion molecules. We have previously found that OBCAM is localized preferentially to dendrites compared with somata and terminals of hypothalamic vasopressin-secreting magnocellular neurons. This localization indicates that OBCAM is one of the dendrite-associated cell adhesion molecules. In the present study, we further characterized the localization and the sorting mechanism, and activity-dependent changes of this molecule in vasopressin-secreting magnocellular dendrites. Confocal microscopic observation revealed the preferential localization of OBCAM at the neurosecretory granules in the vasopressin-positive dendrites. Electron microscopic observation using chromogen-intensified and gold-conjugated methods also demonstrated the OBCAM labeling at most of the neurosecretory granules within the dendrites, while the labeling within the somata was observed at only a few neurosecretory granules. I.c.v. colchicine administration resulted in the disappearance of OBCAM immunoreactivity from the dendrites and in its concomitant accumulation at the somata, suggesting that OBCAM is synthesized at the somata and transported to the dendrites by dendrite-associated neurosecretory granules. During the postnatal development, OBCAM immunoreactivity targeted to vasopressin-positive dendrites became clear from at least 3 weeks after birth, although it appeared at only a few somata 2 weeks after birth. Phosphatidylinositol specific phospholipase C treatment of the membrane fraction of the supraoptic homogenate solubilized OBCAM. Kilon, another IgLON member, was also shown to localize at the neurosecretory granules of vasopressin-positive dendrites via the glycosylphosphatidylinositol anchor. High K+-stimulation appeared to cause the diffusion of OBCAM-labeled gold particles from neurosecretory granules together with the exocytosis. These findings indicate that OBCAM is synthesized within the somata, attached to vasopressin neurosecretory granules via the glycosylphosphatidylinositol anchor, and transported to the dendrites. Moreover, the subcellular localization of OBCAM is changed in an activity-dependent manner.
影响因子：
2.9
作者：
J. Salzer;D. Colman
通讯作者：
J. Salzer;D. Colman
边缘系统相关膜蛋白（LAMP）选择性介导与特定中枢神经元群的相互作用。
DOI：
10.1242/dev.121.4.1161
发表时间：
1995
期刊：
Development (Cambridge, England)
影响因子：
--
作者：
Zhukareva,V;Levitt,P
通讯作者：
Levitt,P
DOI：
10.1002/neu.10050
发表时间：
2002-06-05
期刊：
JOURNAL OF NEUROBIOLOGY
影响因子：
--
作者：
Gil, OD;Zhang, L;Salzer, JL
通讯作者：
Salzer, JL