Modulation of vasopressin-sensitive cyclic AMP levels by calcium in papillary collecting tubules.

Modulation of vasopressin-sensitive cyclic AMP levels by calcium in papillary collecting tubules.
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乳头集合管中钙对加压素敏感的环 AMP 水平的调节。

DOI:
10.1016/0303-7207(88)90075-5
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发表时间:
1988
影响因子:
4.1
通讯作者:
Jackson,BA
Jackson,BA
中科院分区:
医学2区
文献类型:
--
作者:
Jackson,BA

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本研究旨在探讨钙调节加压素(AVP)刺激的大鼠乳头状集合管(PCD)环腺苷酸(cAMP)蓄积的程度,并确定相关机制。在不存在cAMP-磷酸二酯酶抑制剂1-甲基-3-异丁基黄嘌呤(MIX)的情况下,使用次最大浓度的加压素(1 nM),离子载体A23187介导的细胞内钙的增加抑制了AVP依赖性cAMP水平的69%(P< 0.001)。在MIX存在下,抑制程度显著降低(-47%;P< 0.01)。与对照组(1.2 mM钙)相比,当PCD在含有增加的(5.0 mM)钙浓度的培养基中孵育时,AVP敏感性cAMP积累显著降低(-34%;P< 0.05)。在存在MIX的情况下,5.0 mM钙对cAMP水平没有影响。相反,与对照组相比,无钙培养基在不存在MIX的情况下使AVP依赖性cAMP积累增加了89%(P< 0.01),在存在MIX的情况下增加了82%(P< 0.05)。这些数据表明,钙可以调节AVP依赖的cAMP的积累在PCD的腺苷酸环化酶和cAMP磷酸二酯酶活性的影响的结果。
The present study was designed to examine the extent to which calcium modulates vasopressin (AVP)-stimulated cyclic AMP (cAMP) accumulation in microdissected rat papillary collecting ducts (PCD), and to identify the mechanism(s) involved. Using a submaximal concentration of vasopressin (1 nM), ionophore A23187-mediated increases in intracellular calcium inhibited AVP-dependent cAMP levels by 69% (P< 0.001) in the absence of the cAMP-phosphodiesterase inhibitor 1-methyl-3-isobutyl xanthine (MIX). The degree of inhibition was significantly reduced (−47%;P< 0.01) in the presence of MIX. Compared to controls (1.2 mM calcium), AVP-sensitive cAMP accumulation was significantly reduced ( − 34%;P< 0.05) when PCD were incubated in a medium containing an increased (5.0 mM) calcium concentration. In the presence of MIX 5.0 mM calcium had no effect on cAMP levels. Conversely, compared to controls, a calcium-free medium increased AVP-dependent cAMP accumulation by 89% (P< 0.01) in the absence of MIX, and similarly by 82% (P< 0.05) in the presence of MIX. These data demonstrate that calcium can modulate AVP-dependent cAMP accumulation in PCD as a result of effects on both adenylate cyclase and cAMP phosphodiesterase activities.
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