| The role of target muscles in the expression of calcitonin gene-related peptide mRNA in the spinal nucleus of the bulbocavernosus. | |
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MedLine Citation:
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PMID: 1315918 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Previous studies have shown that calcitonin gene-related peptide (CGRP) mRNA steady-state levels and CGRP immunoreactivity in motoneurons of the spinal nucleus of the bulbocavernosus (SNB) are inversely related to the gonadal steroid environment in male rats. Since both the SNB motoneurons and their target muscles, the bulbocavernosus and the levator ani, are steroid sensitive, gonadal steroids may act at either site to regulate CGRP expression. In the present study, we tested the hypothesis that gonadal steroids influence CGRP expression in SNB motoneurons through their effects on the bulbocavernosus and levator ani muscles. We determined the levels of alpha-CGRP mRNA and immunoreactive CGRP in SNB motoneurons of adult male rats following injection of the bulbocavernosus with muscle extracts from bulbocavernosus/levator ani of castrated rats, paralysis of the bulbocavernosus or pudendal nerve cuts. Following injection of the bulbocavernosus/levator ani with extracts from castrated rats, the level of CGRP expression and the number of SNB motoneurons with alpha-CGRP message were increased. These studies suggest that the bulbocavernosus/levator ani muscles from castrated rats produce a factor that increases levels of CGRP. Injections of extract prepared from the bulbocavernosus and levator ani muscles of gonadally intact rats did not change the expression of alpha-CGRP mRNA in the SNB. Paralysis of the bulbocavernosus/levator ani with a local anesthetic increased the number of SNB motoneurons expressing alpha-CGRP mRNA and CGRP immunoreactive neurons. To determine whether nerve damage accounted for the observed effects following injection of anesthetic, the pudendal nerves were cut bilaterally.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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P Popper; C Ulibarri; P E Micevych |
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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. Molecular brain research Volume: 13 ISSN: 0169-328X ISO Abbreviation: Brain Res. Mol. Brain Res. Publication Date: 1992 Mar |
Date Detail:
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Created Date: 1992-06-05 Completed Date: 1992-06-05 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8908640 Medline TA: Brain Res Mol Brain Res Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 43-51 Citation Subset: IM |
Affiliation:
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Department of Anatomy and Cell Biology, UCLA School of Medicine 90024. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Animals Autoradiography Calcitonin Gene-Related Peptide / genetics* Gene Expression Immunohistochemistry Male Motor Neurons / drug effects, physiology* Muscles / physiology* Orchiectomy RNA, Messenger / biosynthesis, genetics* Rats Reference Values Spinal Cord / drug effects, physiology* Sulfur Radioisotopes Tissue Extracts / pharmacology |
| Grant Support | |
ID/Acronym/Agency:
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NS 21220/NS/NINDS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/RNA, Messenger; 0/Sulfur Radioisotopes; 0/Tissue Extracts; 83652-28-2/Calcitonin Gene-Related Peptide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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