Neurally mediated hyperactive voiding in spontaneously hypertensive rats.

Abstract:

:The development of hypertension in spontaneously hypertensive rats (SHR) and hyperactive voiding in rats with urethral obstruction are characterized by abnormal smooth muscle growth, increased tissue levels of nerve growth factor (NGF) and altered patterns of innervation. The present study was undertaken to determine if bladder smooth muscle from SHRs contains and secretes elevated levels of NGF, and if so, whether the augmented NGF contributes to changes in bladder innervation and function without tissue hypertrophy. Voiding behavior was monitored using specially designed metabolic cages. NGF levels in tissue homogenates and conditioned cell culture media were measured by ELISA. NGF mRNA in cultured bladder smooth muscle cells (BSMCs) was quantified using reverse transcriptase PCR. Noradrenergic innervation was assessed by staining with glyoxylic acid and assaying norepinephrine (NE) content in bladders with high performance liquid chromatography. SHRs voided more frequently than WKY rats. NGF content was higher in bladders from adult SHRs when compared to Wistar-Kyoto normotensive rats (WKYs). No significant difference in NGF mRNA content was observed between SHR and WKY BSMCs. However, SHR BSMCs secreted NGF at a higher rate and amount per unit mRNA than did WKY BSMCs. SHR bladders contained more NE and were more densely stained for catecholaminergic fibers than bladders from WKY rats. The results support the hypothesis that elevated NGF secretion by bladder smooth muscle is associated with hyperinnervation of bladder and hyperactive voiding in SHRs. Thus, the SHR strain may represent a genetic model to study changes in bladder function resulting from altered patterns of innervation.

journal_name

Brain Res

journal_title

Brain research

authors

Spitsbergen JM,Clemow DB,McCarty R,Steers WD,Tuttle JB

doi

10.1016/s0006-8993(98)00061-4

subject

Has Abstract

pub_date

1998-04-20 00:00:00

pages

151-9

issue

1-2

eissn

0006-8993

issn

1872-6240

pii

S0006-8993(98)00061-4

journal_volume

790

pub_type

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