Document Detail


Pharmacological characterization of oxytocin-binding sites in rat spinal cord membranes: comparison with embryonic cultured spinal cord neurones and astrocytes.
MedLine Citation:
PMID:  15305574     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Detection and pharmacological characterization of OT-binding sites were performed on 12-day-old rat spinal cord membranes and on embryonic cultured spinal neurones and astrocytes after 12 days in culture. In neurone-enriched cultures, OT-binding sites were detected by autoradiography on cells morphologically comparable to neurone-specific enolase immunoreactive cells. In astrocyte cultures, as shown by combination of autoradiography and immunocytochemistry, OT-binding sites were detected on cells expressing the glial fibrillary acidic protein (a specific astrocytic marker). The pharmacological characterization was assessed by binding studies performed with a highly specific radioiodinated OT antagonist on postnatal rat spinal cord membranes and on embryonic cultured spinal cord neurones and astrocytes. The saturation studies suggested the presence of a single class of binding sites of high affinity for the OT antagonist on spinal membranes and cultured cells, as already described in the rat for central and peripheric OT receptors. The competition studies indicated that on spinal membranes, OT and AVP had the same high affinity, as classically described, whereas on cultured cells, AVP had a lower affinity, suggesting that culture conditions may influence the pharmacology of the spinal OT-binding sites. Involvement of NEM- and Gpp[NH]p-insensitive G-proteins in the coupling of the spinal OT-binding sites with the effector system was evidenced on 12-day-old rat spinal membrane preparations and on neurone and astrocyte cultures.
Authors:
M E Evrard; M T Strosser; D Di Scala-Guenot
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of neuroendocrinology     Volume:  9     ISSN:  0953-8194     ISO Abbreviation:  J. Neuroendocrinol.     Publication Date:  1997 Jul 
Date Detail:
Created Date:  2004-08-12     Completed Date:  2004-08-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8913461     Medline TA:  J Neuroendocrinol     Country:  England    
Other Details:
Languages:  eng     Pagination:  553-60     Citation Subset:  IM    
Affiliation:
CNRS-ULP URA 1446, Laboratoire de Physiologie Générale, 21 rue René Descartes, 67084 Strasbourg Cedex, France.
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MeSH Terms
Descriptor/Qualifier:
Aging
Animals
Astrocytes / drug effects,  physiology*
Binding Sites
Ethylmaleimide / pharmacology
Guanylyl Imidodiphosphate / pharmacology
Magnesium / pharmacology
Neurons / drug effects,  physiology*
Oxytocin / metabolism*
Rats
Rats, Wistar
Spinal Cord / embryology,  physiology*
Chemical
Reg. No./Substance:
128-53-0/Ethylmaleimide; 34273-04-6/Guanylyl Imidodiphosphate; 50-56-6/Oxytocin; 7439-95-4/Magnesium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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