Interstitial cells of Cajal in the urethra.

Interstitial cells of Cajal in the urethra.
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尿道中cajal的间质细胞。

DOI:
10.1111/j.1582-4934.2006.tb00399.x
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发表时间:
2006-04
影响因子:
5.3
通讯作者:
Hollywood MA
Hollywood MA
中科院分区:
医学2区
文献类型:
--
作者:
Sergeant GP;Thornbury KD;McHale NG;Hollywood MA

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尿路的平滑肌层会产生自发的促尿激素,这被认为是尿失禁的主要原因。音调信号产生的机制尚不清楚,然而,我们实验室最近的研究强调了起搏细胞的特殊群体的作用,我们最初将其称为间质细胞(IC),现在称为ICC。尿路ICC具有电起搏机制,其特征是钙激活的C_1通道节律性地激活,导致电压钳下的斑点瞬时内向电流(STIC)和电流钳条件下的自发瞬时耗竭(STD)。在目前的钳制条件下,STICS和STDS都与自发的钙离子有关。目前已知STIC和STDS都与自发性钙振荡有关,这种振荡是细胞内钙释放和跨质膜钙内流之间复杂的相互作用的结果。在这篇综述中,我们将考虑一些参与产生扑克牌活动的精确机制,并讨论这些机制是如何由兴奋性和抑制性神经递质调节的。
The smooth muscle layer of the urethra generates spontaneous mayogenic tone that is thougth to make a major contibution to urinary continence. The mechanisms underlying generion of tone remin unclear, however recent studies from our laboratory highlighted a role for a specialised population of pacemake cells which we originally referrd ot as interstitil cells (IC) and now term ICC. Urethra ICC possess an electrical pacemaker mechanism charactriesd by rhythmic activation of Ca2+-activated C1- Channels leading to spotaneous transient inward currents (STICs) under voltage clamp and spontaneous transient deplarisations (STDs) under surrent clamp conditons. Both STICS and STDs are now known to be associated with spntaneous Ca2+ under current clamp conditons. Both STIC and STDs are now known to be associated with spontaneius Ca2+ oscillations that result from a complex interplay between releas fo Ca2+ from intracellular stores and Ca2+ influx acrosss the plasma membrane. Ink this review we will consider some of the precise mechanisms involved in the generation of paccemake activity and discuss how these are modulated by excitatory and inhibitory neurotrnsmiters.
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