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- Publisher Website: 10.1016/S0024-3205(96)80012-9
- Scopus: eid_2-s2.0-0342995795
- PMID: 8594311
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Article: Internal calcium stores and norepinephrine overflow from isolated, field stimulated rat vas deferens
Title | Internal calcium stores and norepinephrine overflow from isolated, field stimulated rat vas deferens |
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Authors | |
Keywords | Calcium Cyclopiazonic acid Norepinephrine overflow Ryanodine |
Issue Date | 1996 |
Publisher | Elsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/lifescie |
Citation | Life Sciences, 1996, v. 58 n. 8, p. PL123-PL129 How to Cite? |
Abstract | Ryanodine has been shown to selectively inhibit the initial phase of contraction of rat vas deferens smooth muscle stimulated by endogenous release of norepinephrine (NE) (1), and part of this effect could be pre-junctional. To assess this, its effect on NE overflow was measured in the same preparation. NE overflow from electrical field-stimulated isolated rat vas deferens was quantified by electrochemical detection using HPLC. In order to limit pre-junctional autoregulatory mechanisms, α2-adrenergic receptors were blocked and P(2x) purinergic receptors were desensitized. In these experimental conditions, NE overflow was directly proportional to extracellular Ca2+ concentration. Ryanodine only induced a modest decrease in NE overflow. Cyclopiazonic acid (CPA), an inhibitor of sarcoplasmic reticulum Ca2+-ATPase, slightly increased NE overflow but decreased smooth muscle contraction induced by electrical field stimulation. It is concluded that part of the effect of ryanodine on field stimulation-induced contraction may be due to an inhibition of NE release, although the major inhibitory effect of this alkaloid is post junctional. For CPA, its inhibitory effect on field stimulation-induced contraction is entirely postjunctional. Its effect on NE overflow suggests that, in this preparation, internal Ca2+ stores could function to accelerate termination of neurotransmitter release by sequestering cytosolic Ca2+. |
Persistent Identifier | http://hdl.handle.net/10722/171720 |
ISSN | 2023 Impact Factor: 5.2 2023 SCImago Journal Rankings: 1.257 |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Bourreau, JP | en_US |
dc.date.accessioned | 2012-10-30T06:16:36Z | - |
dc.date.available | 2012-10-30T06:16:36Z | - |
dc.date.issued | 1996 | en_US |
dc.identifier.citation | Life Sciences, 1996, v. 58 n. 8, p. PL123-PL129 | en_US |
dc.identifier.issn | 0024-3205 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/171720 | - |
dc.description.abstract | Ryanodine has been shown to selectively inhibit the initial phase of contraction of rat vas deferens smooth muscle stimulated by endogenous release of norepinephrine (NE) (1), and part of this effect could be pre-junctional. To assess this, its effect on NE overflow was measured in the same preparation. NE overflow from electrical field-stimulated isolated rat vas deferens was quantified by electrochemical detection using HPLC. In order to limit pre-junctional autoregulatory mechanisms, α2-adrenergic receptors were blocked and P(2x) purinergic receptors were desensitized. In these experimental conditions, NE overflow was directly proportional to extracellular Ca2+ concentration. Ryanodine only induced a modest decrease in NE overflow. Cyclopiazonic acid (CPA), an inhibitor of sarcoplasmic reticulum Ca2+-ATPase, slightly increased NE overflow but decreased smooth muscle contraction induced by electrical field stimulation. It is concluded that part of the effect of ryanodine on field stimulation-induced contraction may be due to an inhibition of NE release, although the major inhibitory effect of this alkaloid is post junctional. For CPA, its inhibitory effect on field stimulation-induced contraction is entirely postjunctional. Its effect on NE overflow suggests that, in this preparation, internal Ca2+ stores could function to accelerate termination of neurotransmitter release by sequestering cytosolic Ca2+. | en_US |
dc.language | eng | en_US |
dc.publisher | Elsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/lifescie | en_US |
dc.relation.ispartof | Life Sciences | en_US |
dc.rights | Life Sciences. Copyright © Elsevier Inc. | - |
dc.subject | Calcium | - |
dc.subject | Cyclopiazonic acid | - |
dc.subject | Norepinephrine overflow | - |
dc.subject | Ryanodine | - |
dc.subject.mesh | Animals | en_US |
dc.subject.mesh | Calcium - Metabolism - Pharmacology | en_US |
dc.subject.mesh | Calcium-Transporting Atpases - Antagonists & Inhibitors | en_US |
dc.subject.mesh | Chromatography, High Pressure Liquid | en_US |
dc.subject.mesh | Cytosol - Metabolism | en_US |
dc.subject.mesh | Electric Stimulation | en_US |
dc.subject.mesh | Enzyme Inhibitors - Pharmacology | en_US |
dc.subject.mesh | Kinetics | en_US |
dc.subject.mesh | Male | en_US |
dc.subject.mesh | Muscle Contraction - Drug Effects | en_US |
dc.subject.mesh | Muscle, Smooth - Drug Effects - Physiology | en_US |
dc.subject.mesh | Norepinephrine - Analysis - Secretion | en_US |
dc.subject.mesh | Rats | en_US |
dc.subject.mesh | Rats, Sprague-Dawley | en_US |
dc.subject.mesh | Ryanodine - Pharmacology | en_US |
dc.subject.mesh | Sarcoplasmic Reticulum - Enzymology | en_US |
dc.subject.mesh | Vas Deferens - Drug Effects - Physiology - Secretion | en_US |
dc.title | Internal calcium stores and norepinephrine overflow from isolated, field stimulated rat vas deferens | en_US |
dc.type | Article | en_US |
dc.identifier.email | Bourreau, JP:bourreau@hkucc.hku.hk | en_US |
dc.identifier.authority | Bourreau, JP=rp00389 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1016/S0024-3205(96)80012-9 | en_US |
dc.identifier.pmid | 8594311 | - |
dc.identifier.scopus | eid_2-s2.0-0342995795 | en_US |
dc.identifier.hkuros | 25740 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-0342995795&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 58 | en_US |
dc.identifier.issue | 8 | en_US |
dc.identifier.spage | PL123 | en_US |
dc.identifier.epage | PL129 | en_US |
dc.publisher.place | United States | en_US |
dc.identifier.scopusauthorid | Bourreau, JP=7003927886 | en_US |
dc.identifier.issnl | 0024-3205 | - |