Spinal glutamatergic NMDA-dependent pelvic nerve-to-external urethra sphincter reflex potentiation caused by a mechanical stimulation in anesthetized rats

Jiuan Miaw Liao, Pei Chen Huang, Shwu Fen Pan, Mei Jung Chen, Kwong Chung Tung, Hsien Yu Peng, Jyh Cherng Shyu, Ying Ming Liou, Gin Den Chen, Tzer Bin Lin

Research output: Contribution to journalArticle

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Abstract

The current study investigates whether the spinal pelvic nerve-to-external urethra sphincter (EUS) reflex potentiation can be induced by a mechanical stimulation and whether the glutamatergic mechanism is involved in yielding such a reflex potentiation. The external urethra sphincter electromyogram (EUSE) activity, evoked by a single or by repetitive pelvic nerve stimulation, in 30 anesthetized rats was recorded with/without bladder saline distension. Without saline distension (0 cmH2O), a single pulse nerve stimulation evoked a single action potential in the reflex activity, whereas repetitive pelvic stimulation and saline distension (6∼20 cmH2O) both elicited a long-lasting reflex potentiation (20.05 ± 3.21 and 75.01 ± 9.87 spikes/stimulation, respectively). The saline distension-induced pelvic nerve-to-EUS reflex potentiation was abolished by D-2-amino-5-phosphonovalerate [APV; a glutamatergic N -methyl-D-aspartic acid (NMDA) receptor antagonist; 100 μM, 10 μl, 1.72 ± 0.31 spikes/stimulation] and attenuated by 2,3-dihydroxy-6-nitro-7-sulfamoylbenzo (F) quinoxaline [NBQX; a glutamatergic α-amino-3-hydroxy-5-methyl-4-isoxazoleproprionate (AMPA) receptor antagonist; 100 μM, 10 μl, 26.16 ± 7.27 spikes/stimulation], but was not affected by bicuculline (a GABAergic antagonist; 100 μM, 10 μl, 53.62 ± 15.54 spikes/stimulation). Intrathecal administration of glutamate (31.12 ± 8.25 spikes/stimulation, 100 μM, 10 μl) and NMDA (26.25 ± 4.12 spikes/stimulation, 100 μM, 10 μl) both induced a long-lasting pelvic nerve-to-EUS reflex potentiation without saline distension, which was similar to the findings observed from saline distension only. The duration of the contraction wave of the urethra was elongated by the saline distension-induced pelvic nerve-to-EUS reflex potentiation, whereas the peak pressure of the contraction wave was not affected. Our findings suggest that saline distension in the bladder elicits a pelvic nerve-to-EUS reflex potentiation and the glutamatergic mechanism contributes to the presence of such a reflex potentiation.

Original languageEnglish
JournalAmerican Journal of Physiology - Renal Physiology
Volume292
Issue number6
DOIs
Publication statusPublished - Jun 2007
Externally publishedYes

Fingerprint

Urethra
N-Methylaspartate
Reflex
Urinary Bladder
2-Amino-5-phosphonovalerate
Spinal Nerves
Quinoxalines
AMPA Receptors
Bicuculline
Electromyography
Action Potentials
Glutamic Acid
Pressure

Keywords

  • AMPA
  • LTP
  • Pelvic nerve
  • Urethra

ASJC Scopus subject areas

  • Physiology

Cite this

Spinal glutamatergic NMDA-dependent pelvic nerve-to-external urethra sphincter reflex potentiation caused by a mechanical stimulation in anesthetized rats. / Liao, Jiuan Miaw; Huang, Pei Chen; Pan, Shwu Fen; Chen, Mei Jung; Tung, Kwong Chung; Peng, Hsien Yu; Shyu, Jyh Cherng; Liou, Ying Ming; Chen, Gin Den; Lin, Tzer Bin.

In: American Journal of Physiology - Renal Physiology, Vol. 292, No. 6, 06.2007.

Research output: Contribution to journalArticle

Liao, Jiuan Miaw ; Huang, Pei Chen ; Pan, Shwu Fen ; Chen, Mei Jung ; Tung, Kwong Chung ; Peng, Hsien Yu ; Shyu, Jyh Cherng ; Liou, Ying Ming ; Chen, Gin Den ; Lin, Tzer Bin. / Spinal glutamatergic NMDA-dependent pelvic nerve-to-external urethra sphincter reflex potentiation caused by a mechanical stimulation in anesthetized rats. In: American Journal of Physiology - Renal Physiology. 2007 ; Vol. 292, No. 6.
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AU - Chen, Mei Jung

AU - Tung, Kwong Chung

AU - Peng, Hsien Yu

AU - Shyu, Jyh Cherng

AU - Liou, Ying Ming

AU - Chen, Gin Den

AU - Lin, Tzer Bin

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KW - AMPA

KW - LTP

KW - Pelvic nerve

KW - Urethra

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