β1-Adrenergic Receptors but not β2-Adrenergic or Vasopressin Receptors Regulate K+ Secretion in Vestibular Dark Cells of the Inner Ear

β1-Adrenergic Receptors but not β2-Adrenergic or Vasopressin Receptors Regulate K+ Secretion in Vestibular Dark Cells of the Inner Ear
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β1-肾上腺素能受体而非 β2-肾上腺素或加压素受体调节内耳前庭暗细胞中 K+ 的分泌

DOI:
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发表时间:
1999
影响因子:
2.4
通讯作者:
M. Scofield
M. Scofield
中科院分区:
生物学4区
文献类型:
--
作者:
P. Wangemann;Jianzhong Liu;M. Shimozono;M. Scofield

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抽象。在功能研究中鉴定了受体,其中K+分泌作为跨上皮电流(Isc)进行监测。此外,通过逆转录聚合酶链反应(RT-PCR)产物的克隆和测序,将受体鉴定为转录本。在对照条件下,沙鼠VDC的Isc为796 ± 15 μA/cm 2(n= 329),小鼠VDC为900 ± 75 μA/cm 2(n= 6)。毛喉素(10− 5 m)而非1,9-双脱氧毛喉素使Isc增加1.42 ± 0.05倍(n= 7)。10− 9 m Arg 8-加压素和10− 9 m去氨加压素对沙鼠和小鼠VDC没有显著影响。异丙肾上腺素、去甲肾上腺素、肾上腺素和Prenalterol刺激Isc的最大倍数分别为1.38 ± 0.04(n= 7)、1.59 ± 0.06(n= 6)、1.64 ± 0.03(n= 8)和1.37 ± 0.03(n= 6)。EC 50值分别为(1.4 ± 0.7)× 10− 8 m(n= 36)、(2.5 ± 1.0)× 10− 8 m(n= 31)、(1.7 ± 0.7)× 10− 7 m(n= 36)和(5 ± 4)× 10− 7 m(n= 32)。普萘洛尔抑制异丙肾上腺素诱导的Isc刺激。阿替洛尔、ICI 118551和CGP 20712 A抑制异丙肾上腺素诱导的Isc刺激,pKDB分别为5.0 × 10− 8 m(pKDB= 7.30 ± 0.07,n= 38)、4.4 × 10− 8 m(pKDB= 7.36 ± 0.14,n= 37)和6.8 × 10− 12 m(pKDB= 11.17 ± 0.12,n= 37)。从显微解剖的前庭迷路组织中提取总RNA,使用特异性引物进行RT-PCR,结果显示β1和β2肾上腺素能受体的产物与预期大小相同,但β3肾上腺素能受体的产物与预期大小不同。序列分析表明,沙鼠β1、β2和β3肾上腺素能受体的同源性分别为96.4%、91.5%和89.6%。这些结果表明VDC的K+分泌受β1肾上腺素能受体或加压素受体的控制,而不受β2或β3肾上腺素能受体或加压素受体的控制。
Abstract. Receptors were identified pharmacologically in functional studies where K+ secretion was monitored as transepithelial current (Isc). Further, receptors were identified as transcripts by cloning and sequencing of reverse-transcriptase polymerase chain reaction (RT-PCR) products. Isc under control conditions was 796 ± 15 μA/cm2 (n= 329) in gerbilline VDC and 900 ± 75 μA/cm2 (n= 6) in murine VDC. Forskolin (10−5m) but not 1,9-dideoxy-forskolin increased Isc by a factor of 1.42 ± 0.05 (n= 7). 10−9m Arg8-vasopressin and 10−9m desmopressin had no significant effect in gerbilline and murine VDC. Isoproterenol, norepinephrine, epinephrine and prenalterol stimulated Isc maximally by a factor of 1.38 ± 0.04 (n= 7), 1.59 ± 0.06 (n= 6), 1.64 ± 0.03 (n= 8) and 1.37 ± 0.03 (n= 6), respectively. The EC50 values were (1.4 ± 0.7) × 10−8m (n= 36), (2.5 ± 1.0) × 10−8m (n= 31), (1.7 ± 0.7) × 10−7m (n= 36) and (5 ± 4) × 10−7m (n= 32), respectively. Propanolol inhibited isoproterenol-induced stimulation of Isc. Atenolol, ICI118551 and CGP20712A inhibited isoproterenol-induced stimulation of Isc with a pKDB of 5.0 × 10−8m (pKDB= 7.30 ± 0.07, n= 38), 4.4 × 10−8m (pKDB= 7.36 ± 0.14, n= 37) and 6.8 × 10−12m (pKDB= 11.17 ± 0.12, n= 37), respectively. RT-PCR of total RNA isolated from microdissected vestibular labyrinth tissue using specific primers revealed products of the predicted sizes for β1- and β2-adrenergic receptors but not for β3-adrenergic receptors. Sequence analysis of the amplified cDNA fragments from gerbilline tissues revealed a 96.4%, 91.5% and 89.6% identity compared to rat β1-, β2- and β3-adrenergic receptors, respectively. These results demonstrate that K+ secretion in VDC is under the control of β1- but not β2- or β3-adrenergic receptors or vasopressin-receptors.
豚鼠的前庭交感神经系统。
DOI: 10.3109/00016488909127496
发表时间: 1989
影响因子: 1.4
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DOI: 10.1152/ajpcell.1991.261.3.c433
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期刊: The American journal of physiology
影响因子: --
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Whisenant,N;Zhang,BX;Khademazad,M;Loessberg,P;Muallem,S
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大鼠β1-肾上腺素能受体基因的分子克隆和表达。
DOI: --
发表时间: 1990
期刊: The Journal of biological chemistry
影响因子: --
作者:
Machida,CA;Bunzow,JR;Searles,RP;VanTol,H;Tester,B;Neve,KA;Teal,P;Nipper,V;Civelli,O
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C6 胶质瘤细胞中地塞米松对 β1- 和 β2- 肾上腺素能受体的密切相互调节:对儿茶酚胺反应性的影响。
DOI: --
发表时间: 1993
影响因子: 3.6
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Zhong,H;Minneman,KP
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