| Substance P and GABAergic effects on adrenal and autonomic function evoked by microinjections into trigeminal subnucleus caudalis in the cat. | |
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MedLine Citation:
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PMID: 2475206 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To assess the contribution of putative neurotransmitters in mediating changes in adrenal and autonomic function evoked by activation of medullary dorsal horn neurons, microinjections of substance P, bicuculline methiodide, or muscimol were directed at various laminac of trigeminal subnucleus caudalis in the anesthetized cat. Injections of substance P (35.6 pmol) into the superficial layers (lamina I-II) of subnucleus caudalis increased the adrenal secretion of epinephrine (+8.3 +/- 2.3 ng/min, P less than 0.01), arterial pressure (+11 +/- 5.3 mm Hg, P less than 0.01), and heart rate (+19.4 +/- 4.9 beats/min, P less than 0.01) by 1 min, and increased the plasma concentration of adrenocorticotropin (+26 +/- 10 pg/ml, P less than 0.01) by 3 min. Substance P injections into the magnocellular layers (lamina III-IV) or deep magnocellular layers (lamina V-VI) had no significant effects. Microinjections of the GABAA antagonist, bicuculline methiodide (62.4 pmol), into the superficial layers of subnucleus caudalis increased the adrenal secretion of epinephrine (+4.5 +/- 3.2 ng/min, P less than 0.01) by 1 min, whereas injections of the GABAA agonist, muscimol (280 pmol), decreased the secretion (-5.8 +/- 2.8 ng/min, P less than 0.05) by 6 min. Arterial pressure increased after bicuculline (+17.8 +/- 8.2 mm Hg, P less than 0.01) and decreased after muscimol (-6.3 +/- 2.9 mm Hg, P less than 0.01) injections into the superficial layers. Injections of bicuculline or muscimol into the magnocellular layers or into the deep magnocellular layers had no effect on adrenal secretion of catecholamines or on systemic cardiovascular function. Peripheral venous concentrations of adrenocorticotropin were not affected significantly by microinjections of GABAergic agents regardless of the laminar site of injection within subnucleus caudalis. Equivalent volume injections of artificial cerebrospinal fluid into the superficial laminae of subnucleus caudalis had no significant influence on any measured variable. Substance P-evoked changes in the adrenal secretion of epinephrine were not correlated with changes in adrenal venous blood flow, whereas bicuculline- and muscimol-evoked changes in adrenal secretion of catecholamines were positively correlated with changes in adrenal blood flow (P less than 0.01). The results indicate that substance P and GABA contribute significantly to the trigeminal control of adrenal and autonomic function by acting on neurons in the superficial layers of subnucleus caudalis, a brainstem region that processes nociceptive sensory information. |
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Authors:
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D A Bereiter; D S Gann |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Brain research Volume: 490 ISSN: 0006-8993 ISO Abbreviation: Brain Res. Publication Date: 1989 Jun |
Date Detail:
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Created Date: 1989-09-25 Completed Date: 1989-09-25 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0045503 Medline TA: Brain Res Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 307-19 Citation Subset: IM |
Affiliation:
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Section of Neurobiology, Brown University/Rhode Island Hospital, Providence 02903. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adrenal Glands
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drug effects,
metabolism,
physiology* Adrenocorticotropic Hormone / blood Animals Autonomic Nervous System / drug effects, physiology* Bicuculline / pharmacology* Blood Pressure / drug effects Catecholamines / blood Cats Female Heart Rate / drug effects Male Muscimol / pharmacology* Substance P / pharmacology*, physiology Trigeminal Nucleus, Spinal / drug effects, physiology* gamma-Aminobutyric Acid / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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DK-26831/DK/NIDDK NIH HHS; NS-26137/NS/NINDS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Catecholamines; 2763-96-4/Muscimol; 33507-63-0/Substance P; 485-49-4/Bicuculline; 56-12-2/gamma-Aminobutyric Acid; 9002-60-2/Adrenocorticotropic Hormone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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