Sympathoinhibitory action of nociceptin in the rat spinal cord

G. C. Brailoiu, C. C. Lai, C. T. Chen, L. L. Hwang, H. H. Lin, N. J. Dun

研究成果: 雜誌貢獻文章

11 引文 (Scopus)

摘要

1. Whole-cell patch recordings were made from antidromically identified sympathetic preganglionic neurons (SPN) of immature rat spinal cord slices. Bath application of nociceptin (0.1-1 μmol/L) suppressed excitatory postsynaptic potentials (EPSP) and hyperpolarized a population of SPN; these effects were naloxone (1 μmol/L) insensitive. 2. Nociceptin suppressed the amplitude of EPSP without causing a concomitant change in glutamate-induced depolarizations, suggesting a presynaptic inhibitory action. 3. Analysis of current-voltage relationships showed that nociceptin hyperpolarized SPN by increasing an inwardly rectifying K+ current. 4. Intrathecal injection of nociceptin (3, 10 and 30 nmol) to urethane-anaesthetized rats dose-dependently reduced the mean arterial pressure and heart rate; these effects were not prevented by prior intravenous injection of naloxone (1 mg/kg). 5. Results from our in vitro and in vivo experiments suggest that nociceptin suppresses spinal sympathetic outflow either by attenuating excitatory synaptic responses or hyperpolarizing SPN.
原文英語
頁(從 - 到)233-237
頁數5
期刊Clinical and Experimental Pharmacology and Physiology
29
發行號3
DOIs
出版狀態已發佈 - 2002

指紋

Spinal Cord
Neurons
Excitatory Postsynaptic Potentials
Naloxone
Spinal Injections
Urethane
Patch-Clamp Techniques
Baths
Intravenous Injections
Glutamic Acid
Arterial Pressure
Heart Rate
nociceptin
Population

ASJC Scopus subject areas

  • Physiology
  • Pharmacology (medical)
  • Pharmacology, Toxicology and Pharmaceutics(all)

引用此文

Sympathoinhibitory action of nociceptin in the rat spinal cord. / Brailoiu, G. C.; Lai, C. C.; Chen, C. T.; Hwang, L. L.; Lin, H. H.; Dun, N. J.

於: Clinical and Experimental Pharmacology and Physiology, 卷 29, 編號 3, 2002, p. 233-237.

研究成果: 雜誌貢獻文章

Brailoiu, G. C. ; Lai, C. C. ; Chen, C. T. ; Hwang, L. L. ; Lin, H. H. ; Dun, N. J. / Sympathoinhibitory action of nociceptin in the rat spinal cord. 於: Clinical and Experimental Pharmacology and Physiology. 2002 ; 卷 29, 編號 3. 頁 233-237.
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AU - Lai, C. C.

AU - Chen, C. T.

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AU - Lin, H. H.

AU - Dun, N. J.

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AB - 1. Whole-cell patch recordings were made from antidromically identified sympathetic preganglionic neurons (SPN) of immature rat spinal cord slices. Bath application of nociceptin (0.1-1 μmol/L) suppressed excitatory postsynaptic potentials (EPSP) and hyperpolarized a population of SPN; these effects were naloxone (1 μmol/L) insensitive. 2. Nociceptin suppressed the amplitude of EPSP without causing a concomitant change in glutamate-induced depolarizations, suggesting a presynaptic inhibitory action. 3. Analysis of current-voltage relationships showed that nociceptin hyperpolarized SPN by increasing an inwardly rectifying K+ current. 4. Intrathecal injection of nociceptin (3, 10 and 30 nmol) to urethane-anaesthetized rats dose-dependently reduced the mean arterial pressure and heart rate; these effects were not prevented by prior intravenous injection of naloxone (1 mg/kg). 5. Results from our in vitro and in vivo experiments suggest that nociceptin suppresses spinal sympathetic outflow either by attenuating excitatory synaptic responses or hyperpolarizing SPN.

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