Opioid receptor-like 1 stimulation in the collecting duct induces aquaresis through vasopressin-independent aquaporin-2 downregulation.

Opioid receptor-like 1 stimulation in the collecting duct induces aquaresis through vasopressin-independent aquaporin-2 downregulation.
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集合管中的类阿片受体 1 刺激通过不依赖加压素的水通道蛋白 2 下调诱导水渗出。

DOI:
10.1152/ajprenal.00329.2003
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发表时间:
2004
期刊:
American journal of physiology. Renal physiology
影响因子:
--
通讯作者:
T. Jonassen
T. Jonassen
中科院分区:
--
文献类型:
--
作者:
N. Hadrup;J. Petersen;J. Praetorius;E. Meier;M. Graebe;L. Brønd;D. Staahltoft;S. Nielsen;S. Christensen;D. Kapusta;T. Jonassen

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伤害素是抑制G蛋白偶联的阿片受体1受体的内源性配体,可引起大鼠的尿失禁(即增加无溶质尿液的排泄)。然而,这种效应背后的机制尚未得到解释。用免疫组织化学方法,我们发现大鼠肾脏阿片受体样受体1与加压素调节的水通道蛋白-2共存于内髓集合管。我们通过注入选择性伤害素类似物ZP120C来研究阿片受体样1受体刺激的水位性效应;通过计算机驱动的伺服控制的静脉容量替代50 mM葡萄糖来防止容量耗竭。在血管加压素血浆浓度没有变化的情况下,ZP120C在正常和充血性心力衰竭大鼠中诱导了显着和持续的失水。ZP120C诱导的失水与两组大鼠水通道蛋白-2蛋白水平的下调有关,提示阿片受体样1受体的刺激通过抑制血管加压素2型受体介导的刺激收集管水重吸收而产生失水。然而,在ZP120C处理4h后,仍然存在大量的PKA介导的丝氨酸256磷酸化水通道蛋白-2。此外,伤害素和ZP120C预先孵育都不能抑制加压素介导的cAMP在离体集合管中的积聚。我们得出结论,在正常和充血性心力衰竭大鼠中,肾阿片受体样受体1的刺激通过水通道蛋白-2的下调,通过不涉及抑制血管加压素-2型受体介导的cAMP产生的机制,通过直接的肾脏作用产生水迷失。
Nociceptin, the endogenous ligand of the inhibitory G protein-coupled opioid receptor-like 1 receptor, produces aquaresis (i.e., increases the excretion of solute-free urine) in rats. However, the mechanism underlying this effect has not yet been explained. Using immunohistochemistry, we found the opioid receptor-like 1 receptor in the rat kidney colocalized with the vasopressin-regulated water channel aquaporin-2 in inner medullary collecting ducts. We investigated the aquaretic effect of opioid receptor-like 1 receptor stimulation by infusing the selective nociceptin analog ZP120C; volume depletion was prevented by computer-driven, servo-controlled intravenous volume replacement with 50 mM glucose. ZP120C induced a marked and sustained aquaresis in normal and congestive heart failure rats in the absence of changes in vasopressin plasma concentrations. The ZP120C-induced aquaresis was associated with downregulation of the aquaporin-2 protein level in both rat groups, suggesting that opioid receptor-like 1 receptor stimulation produces aquaresis by inhibiting the vasopressin type-2 receptor-mediated stimulation on collecting duct water reabsorption. However, substantial amounts of PKA-mediated serine 256 phosphorylated aquaporin-2 were still present after 4 h of ZP120C treatment. Furthermore, neither preincubation with nociceptin nor ZP120C inhibited vasopressin-mediated cAMP accumulation in isolated collecting ducts. We conclude that renal opioid receptor-like 1 receptor stimulation in normal and congestive heart failure rats produces aquaresis by a direct renal effect, via aquaporin-2 downregulation, through a mechanism not involving inhibition of vasopressin type-2 receptor-mediated cAMP production.
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