Gabreilla L Robilotto, Olivia J Yang, Firoj Alom, Richard D Johnson, Aaron D Mickle
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Optogenetic stimulation of urothelial cells cultured from UPK2-ChR2 mice initiates cellular depolarization and release of ATP. Cystometry recordings demonstrated that optical stimulation of urothelial cells increases bladder pressure and pelvic nerve activity. Increases in bladder pressure persisted, albeit to a lesser extent, when the bladder was excised in an in vitro preparation. The P2X receptor antagonist PPADS significantly reduced optically evoked bladder contractions in vivo and ex vivo. Furthermore, corresponding nerve activity was also inhibited with PPADS. Our data suggest that urothelial cells can initiate robust bladder contractions via sensory nerve signaling or contractions through local signaling mechanisms. These data support a foundation of literature demonstrating communication between sensory neurons and urothelial cells. Importantly, with further use of these optogenetic tools, we hope to scrutinize this signaling mechanism, its importance for normal micturition and nociception, and how it may be altered in pathophysiological conditions.<b>NEW & NOTEWORTHY</b> Urothelial cells play a sensory role in bladder function. However, it has been particularly challenging to study this communication as both sensory neurons and urothelial cells express similar sensory receptors. Here we demonstrate using an optogenetic technique, that specific urothelial stimulation alone resulted in bladder contractions. This approach will have a long-lasting impact on how we study urothelial-to-sensory neuron communication and the changes that occur under disease conditions.</p>","PeriodicalId":7588,"journal":{"name":"American Journal of Physiology-renal Physiology","volume":null,"pages":null},"PeriodicalIF":3.7000,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Optogenetic urothelial cell stimulation induces bladder contractions and pelvic nerve afferent firing.\",\"authors\":\"Gabreilla L Robilotto, Olivia J Yang, Firoj Alom, Richard D Johnson, Aaron D Mickle\",\"doi\":\"10.1152/ajprenal.00035.2023\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Urothelial cells, which play an essential role in barrier function, are also thought to play a sensory role in bladder physiology by releasing signaling molecules in response to sensory stimuli that act upon adjacent sensory neurons. 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引用次数: 0
摘要
尿路上皮细胞在屏障功能中起着至关重要的作用,也被认为在膀胱生理学中起着感觉作用,通过释放信号分子来响应作用于相邻感觉神经元的感觉刺激。然而,由于受体表达的重叠和尿路上皮细胞与感觉神经元的接近,研究这种交流是具有挑战性的。为了克服这一挑战,我们开发了一种小鼠模型,我们可以使用光遗传学直接刺激尿路上皮细胞。我们将一只uroplakin II (UPK2) cre小鼠与一只在cre表达的情况下表达光激活阳离子通道rhodopsin-2 (ChR2)的小鼠杂交。光遗传刺激UPK2-ChR2小鼠培养的尿路上皮细胞启动细胞去极化和ATP的释放。膀胱测量记录显示,光刺激尿路上皮细胞增加膀胱压力和骨盆神经活动。当膀胱在体外制备中切除时,膀胱压力的增加持续存在,尽管程度较小。P2X受体拮抗剂PPADS在体内和体外均可显著减少光诱发的膀胱收缩。此外,PPADS还能抑制相应的神经活动。我们的数据表明,尿路上皮细胞可以通过感觉神经信号或局部信号机制启动强大的膀胱收缩。这些数据支持了证明感觉神经元和尿路上皮细胞之间通信的文献基础。重要的是,随着这些光遗传学工具的进一步使用,我们希望仔细研究这种信号机制,它对正常排尿和伤害感觉的重要性,以及它在病理生理条件下如何改变。尿路上皮细胞在膀胱功能中起感觉作用。然而,研究这种交流尤其具有挑战性,因为感觉神经元和尿路上皮细胞表达相似的感觉受体。在这里,我们证明使用光遗传学技术,特异性尿路上皮刺激单独导致膀胱收缩。这种方法将对我们如何研究尿路上皮到感觉神经元的通信以及疾病条件下发生的变化产生长期影响。
Urothelial cells, which play an essential role in barrier function, are also thought to play a sensory role in bladder physiology by releasing signaling molecules in response to sensory stimuli that act upon adjacent sensory neurons. However, it is challenging to study this communication due to the overlap in receptor expression and proximity of urothelial cells to sensory neurons. To overcome this challenge, we developed a mouse model where we can directly stimulate urothelial cells using optogenetics. We crossed a uroplakin II (UPK2) cre mouse with a mouse that expresses the light-activated cation channel channelrhodopsin-2 (ChR2) in the presence of cre expression. Optogenetic stimulation of urothelial cells cultured from UPK2-ChR2 mice initiates cellular depolarization and release of ATP. Cystometry recordings demonstrated that optical stimulation of urothelial cells increases bladder pressure and pelvic nerve activity. Increases in bladder pressure persisted, albeit to a lesser extent, when the bladder was excised in an in vitro preparation. The P2X receptor antagonist PPADS significantly reduced optically evoked bladder contractions in vivo and ex vivo. Furthermore, corresponding nerve activity was also inhibited with PPADS. Our data suggest that urothelial cells can initiate robust bladder contractions via sensory nerve signaling or contractions through local signaling mechanisms. These data support a foundation of literature demonstrating communication between sensory neurons and urothelial cells. Importantly, with further use of these optogenetic tools, we hope to scrutinize this signaling mechanism, its importance for normal micturition and nociception, and how it may be altered in pathophysiological conditions.NEW & NOTEWORTHY Urothelial cells play a sensory role in bladder function. However, it has been particularly challenging to study this communication as both sensory neurons and urothelial cells express similar sensory receptors. Here we demonstrate using an optogenetic technique, that specific urothelial stimulation alone resulted in bladder contractions. This approach will have a long-lasting impact on how we study urothelial-to-sensory neuron communication and the changes that occur under disease conditions.
期刊介绍:
The American Journal of Physiology - Renal Physiology publishes original manuscripts on timely topics in both basic science and clinical research. Published articles address a broad range of subjects relating to the kidney and urinary tract, and may involve human or animal models, individual cell types, and isolated membrane systems. Also covered are the pathophysiological basis of renal disease processes, regulation of body fluids, and clinical research that provides mechanistic insights. Studies of renal function may be conducted using a wide range of approaches, such as biochemistry, immunology, genetics, mathematical modeling, molecular biology, as well as physiological and clinical methodologies.