Interstitial cells of Cajal in the urethra |
| |
Authors: | Sergeant G P Thornbury K D McHale N G Hollywood M A |
| |
Institution: | Smooth Muscle Research Centre, Dundalk Institute of Technology, Co. Louth, Ireland. gerard.sergeant@dkit.ie |
| |
Abstract: | The smooth muscle layer of the urethra generates spontaneous myogenic tone that is thought to make a major contribution to urinary continence. The mechanisms underlying generation of tone remain unclear, however recent studies from our laboratory highlighted a role for a specialised population of pacemaker cells which we originally referred to as interstitial cells (IC) and now term ICC. Urethra ICC possess an electrical pacemaker mechanism characterised by rhythmic activation of Ca(2+)-activated Cl(-) channels leading to spontaneous transient inward currents (STICs) under voltage clamp and spontaneous transient depolarisations (STDs) under current clamp conditions. Both STICS and STDs are now known to be associated with spontaneous Ca(2+) oscillations that result from a complex interplay between release of Ca(2+) from intracellular stores and Ca(2+) influx across the plasma membrane. In this review we will consider some of the precise mechanisms involved in the generation of pacemaker activity and discuss how these are modulated by excitatory and inhibitory neurotransmitters. |
| |
Keywords: | urethra smooth Muscle pacemaker interstitial cells of Cajal Calcium oscillations |
本文献已被 PubMed 等数据库收录! |