Clodfelder-Miller Buffie, Ness Timothy J, DeBerry Jennifer J
Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, AL, United States.
Front Syst Neurosci. 2022 Mar 11;16:858220. doi: 10.3389/fnsys.2022.858220. eCollection 2022.
Bladder pain and hypersensitivity to bladder filling are clinically common, but animal models examining syndromes with these features are limited. A rat model of bladder hypersensitivity produced by neonatal bladder inflammation (NBI) has been reported to have many of the clinical features of bladder pain syndromes. The present study sought to determine whether similar hypersensitivity might be induced by NBI in mice. Female C57BL6/J mice had NBI induced on postnatal days P12-14 by the intravesical administration of zymosan. As adults (12-14 weeks of age), the mice were examined for hypersensitivity of their bladders as: spontaneous voiding and evoked cystometrograms at baseline, and visceromotor responses (VMRs) to urinary bladder distension (UBD) following a secondary insult (either repeated bladder inflammation or acute stress induced by footshock). Mice that experienced NBI demonstrated hypersensitivity, when compared with control mice, manifested as increased spontaneous voiding, increased frequency of evoked voids during intravesical saline infusion, and increased vigor of VMRs to UBD following either acute bladder inflammation or acute stress. This recapitulates the hallmark features of clinical painful bladder disorders and suggest utility of this murine model for the study of these disorders while allowing methodological expansion into well-established genetic and immunological models.
膀胱疼痛和对膀胱充盈的超敏反应在临床上很常见,但用于研究具有这些特征综合征的动物模型却很有限。据报道,一种由新生期膀胱炎症(NBI)产生的膀胱超敏反应大鼠模型具有膀胱疼痛综合征的许多临床特征。本研究旨在确定NBI是否能在小鼠中诱导出类似的超敏反应。雌性C57BL6/J小鼠在出生后第12 - 14天通过膀胱内注射酵母聚糖诱导NBI。成年后(12 - 14周龄),对小鼠膀胱超敏反应进行检测,包括:基线时的自发排尿和诱发膀胱压力容积测定,以及在二次损伤(反复膀胱炎症或足底电击诱导的急性应激)后对膀胱扩张(UBD)的内脏运动反应(VMRs)。与对照小鼠相比,经历过NBI的小鼠表现出超敏反应,表现为自发排尿增加、膀胱内注入生理盐水期间诱发排尿频率增加,以及在急性膀胱炎症或急性应激后对UBD的VMRs活力增加。这概括了临床疼痛性膀胱疾病的标志性特征,并表明该小鼠模型在研究这些疾病方面的实用性,同时允许在成熟的遗传和免疫模型中扩展方法学。