Characterization of ATP-sensitive potassium channels in human corporal smooth muscle cells.

Characterization of ATP-sensitive potassium channels in human corporal smooth muscle cells.
复制标题

人体平滑肌细胞中 ATP 敏感钾通道的表征。

DOI:
10.1038/sj.ijir.3900398
复制
发表时间:
1999
期刊:
International journal of impotence research.
影响因子:
--
通讯作者:
Christ,GJ
Christ,GJ
中科院分区:
--
文献类型:
--
作者:
Lee,SW;Wang,HZ;Christ,GJ

文献摘要

参考文献

被引文献

相似文献

钾(K)通道在调节人体平滑肌张力中起着重要作用,因此,勃起能力。最近的药理学研究表明,代谢调节的K通道(K ATP)可能是人类阴茎勃起的重要调节剂,具有重要的治疗潜力。因此,这些初步研究的目的是利用膜片钳技术来表征在培养和新鲜分离的人下体平滑肌细胞中存在的假定的K ATP亚型。在细胞贴附贴片模式下,鉴定出两种不同的单一K+电流,其各自的电导值在培养和新鲜分离的平滑肌细胞中相似。在培养的肌细胞中,对称KCl (140 mM)溶液中测得的电导值分别为59.1±2.7 pS和18.4±2.1 pS (n= 5个细胞)。在相同的实验条件下,新分离的肌细胞对应的电导值分别为59.2±3.7 pS和18.5±2.4 pS (n= 4个细胞)。在阶跃去极化(−60 ~ + 80 mV)过程中构建的IV曲线揭示了两个单位电导的线性IV关系。单通道记录表明,在由内向外连接的贴片结构中,将ATP (1-3 mM)应用于浴液中,可以可逆地抑制两种电导。pinacidil (10 μM)和levcromakalim (10 μM)均显著提高了两个K通道亚型的单一活性。全细胞贴片记录显示,在阶跃去极化(- 70 mV至+ 130 mV)期间,格列本脲敏感、松酸和左旋克罗卡林诱导的全细胞外向K+电流分别增加105±37%、139±42%。这些数据证实并扩展了我们之前的观察结果,并为人类下体平滑肌细胞中存在K ATP通道亚型提供了第一个证据。
Potassium (K) channels play a significant role in modulating human corporal smooth muscle tone, and thus, erectile capacity. Recent pharmacological studies indicate that the metabolically-regulated K channel (K ATP) may be an important modulator of human penile erection with significant therapeutic potential. The goal of these initial studies, therefore, was to utilize patch clamp techniques to characterize the putative K ATP subtype (s) present in cultured and freshly isolated human corporal smooth muscle cells. In the cell-attached patch mode, two distinct unitary K+ currents were identified whose respective conductance values were similar in cultured and freshly isolated smooth muscle cells. In cultured myocytes, the measured conductance values in symmetric KCl (140 mM) solutions were 59.1±2.7 pS and 18.4±2.1 pS (n= 5 cells). Under identical experimental conditions in freshly isolated myocytes, corresponding conductance values were 59.2±3.7 pS and 18.5±2.4 pS, respectively (n= 4 cells). IV curves constructed during step depolarization (− 60 to+ 80 mV), revealed a linear IV relationship for both unitary conductances. Single channel records documented that both conductances were reversibly inhibited by the application of ATP (1–3 mM) to the bath solution in the inside-out attached patch configuration. The unitary activity of both K channel subtypes was significantly increased by the application of pinacidil (10 μM) and levcromakalim (10 μM). Whole cell patch recordings documented a glibenclamide-sensitive, pinacidil-and levcromakalim-induced increase in the whole cell outward K+ current during step depolarization (− 70 mV to+ 130 mV) of 105±37%, 139±42%, respectively. These data confirm and extend our previous observations, and provide the first evidence for the presence of K ATP channel subtypes in human corporal smooth muscle cells.
钾通道开放剂对正常和高反射逼尿肌的松弛作用
DOI: --
发表时间: 1997
期刊:
影响因子: --
作者:
S. W. Martin;S. Radley;R. Chess;C. Korstanje;C. Chapple
通讯作者: C. Chapple
膜界面上的羧基作为局部麻醉剂的分子靶标。
DOI: --
发表时间: 1998
影响因子: 3.8
作者:
Sonia R.W. Louro;Celia Anteneodo;Eliane Wajnberg
通讯作者: Eliane Wajnberg
核苷酸和钾通道开放剂对哺乳动物细胞系 HEK293T 细胞中表达的 SUR2A/Kir6.2 复合体 K 通道的影响
DOI: --
发表时间: 1998
期刊: Pflügers Archiv
影响因子: --
作者:
Y. Okuyama;M. Yamada;C. Kondo;E. Satoh;S. Isomoto;T. Shindo;Y. Horio;M. Kitakaze;M. Hori;Y. Kurachi
通讯作者: Y. Kurachi
钾通道激动剂与完整大鼠胰岛素瘤细胞的高亲和力结合。
DOI: --
发表时间: 1993
期刊: Biochemical and Biophysical Research Communications - BBRC
影响因子: --
作者:
F. Hoffman;J. Lenfers;E. Niemers;U. Pleiss;A. Scriabine;R. Janis
通讯作者: R. Janis
新型二氢吡啶化合物9-(3-氰基苯基)-3,4,6,7,9,10-六氢-1,8-(2H,5H)-吖啶离子的K(ATP)通道开放活性研究
DOI: --
发表时间: 1996
期刊: Arzneimittel-Forschung
影响因子: --
作者:
J. Li;G. Yasay;S. Kau;C. Ohnmacht;D. A. Trainor;A. Bonev;T. Heppner;M. Nelson
通讯作者: M. Nelson