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• W2066043959 endingPage "299" @default.
• W2066043959 startingPage "293" @default.
• W2066043959 abstract "Every cell or neuronal type utilizes its own specific organization of its Ca(2+) homeostasis depending on its specific function and its physiological needs. The magnocellular neurones, with their somata situated in the supraoptic and paraventricular nuclei of the hypothalamus and their nerve terminals populating the posterior hypophysis (neural lobe) are a typical and classical example of a neuroendocrine system, and an important experimental model for attempting to understand the characteristics of the neuronal organization of Ca(2+) homeostasis. The magnocellular neurones synthesize, in a cell specific manner, two neurohormones: arginine-vasopressin (AVP) and oxytocin (OT), which can be released, in a strict Ca(2+)-dependent manner, both at the axonal terminals, in the neural lobe, and at the somatodendritic level. The two types of neurones show also distinct type of bioelectrical activity, associated with specific secretory patterns. In these neurones, the Ca(2+) homeostatic pathways such as the Na(+)/Ca(2+) exchanger (NCX), the endoplasmic reticulum (ER) Ca(2+) pump, the plasmalemmal Ca(2+) pump (PMCA) and the mitochondria are acting in a complementary fashion in clearing Ca(2+) loads that follow neuronal stimulation. The somatodendritic AVP and OT release closely correlates with intracellular Ca(2+) dynamics. More importantly, the ER Ca(2+) stores play a major role in Ca(2+) homeostatic mechanism in identified OT neurones. The balance between the Ca(2+) homeostatic systems that are in the supraoptic neurones differ from those active in the terminals, in which mainly Ca(2+) extrusion through the Ca(2+) pump in the plasma membrane and uptake by mitochondria are active. In both AVP and OT nerve terminals, no functional ER Ca(2+) stores can be evidenced experimentally. We conclude that the physiological significance of the complexity of Ca(2+) homeostatic mechanisms in the somatodendritic region of supraoptic neurones and their terminals can be multifaceted, attributable, in major part, to their specialized electrical activity and Ca(2+)-dependent neurohormone release." @default.
• W2066043959 created "2016-06-24" @default.
• W2066043959 creator A5046899972 @default.
• W2066043959 creator A5066981475 @default.
• W2066043959 creator A5071294294 @default.
• W2066043959 creator A5081859874 @default.
• W2066043959 creator A5083227570 @default.
• W2066043959 date "2012-03-01" @default.
• W2066043959 modified "2023-09-29" @default.
• W2066043959 title "Segregation of calcium signalling mechanisms in magnocellular neurones and terminals" @default.
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