Abstract

This study extensively examined the role of a 5-HT1A receptor in controlling voiding function in anesthetized male rats. A simultaneous recording of the intravesical pressure (IVP), external urethral sphincter (EUS)-electromyography (EMG), and urine flow rate (UFR) during continuous cystometry was used. 8-Hydroxy-2-(di-n-propylamino)-tetralin (8-OH-DPAT), a 5-HT1A receptor agonist, significantly improved the voiding efficiency, as detected by increases in the evoked contraction amplitude, EUS burst period, and silent period, and decreases in the volume threshold, pressure threshold, and residual volume. Interestingly, the UFR during voiding was reduced by 8-OH-DPAT, as evidenced by decreases in the maximal UFR and mean UFRs of the voiding period, spike duration, and interspike interval. Conversely, treating rats with WAY-100635, a 5-HT1A antagonist, produced effects opposite to those produced by 8-OH-DPAT. These findings suggest that 8-OH-DPAT improved the voiding efficiency by enhancing the detrusor contractile ability and prolonging EUS burst period, which would compensate for the lower UFR, resulting from urethral smooth muscle contractions and longer EUS silent periods during voiding. The present study contributes to our understanding of the role of 5-HT1A receptors in controlling the urine flow rate in male rats.

Original languageEnglish
Pages (from-to)R1239-R1250
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume307
Issue number10
DOIs
Publication statusPublished - Nov 15 2014

Fingerprint

8-Hydroxy-2-(di-n-propylamino)tetralin
Urethra
Receptor, Serotonin, 5-HT1A
Urine
Serotonin 5-HT1 Receptor Antagonists
Serotonin 5-HT1 Receptor Agonists
Pressure
Residual Volume
Electromyography
Muscle Contraction
Smooth Muscle
hydroxide ion

Keywords

  • 8-hydroxy-2-(di-n-propylamino)-tetralin
  • External urethral sphincter-electromyography
  • Intravesical pressure
  • Voiding efficiency
  • WAY-100635

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)
  • Medicine(all)

Cite this

Influence of serotonergic mechanisms on the urine flow rate in male rats. / Fan, Wen Jia; Chen, Shih-Ching; Hsieh, Tsung-hsun; Lai, Chien-Hung; Lin, You-Shuei; Peng, Chih-Wei; Kou, Yu Ru.

In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology, Vol. 307, No. 10, 15.11.2014, p. R1239-R1250.

Research output: Contribution to journalArticle

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