Document Detail


Regulation of pharyngeal motility by FMRFamide and related peptides in the medicinal leech, Hirudo medicinalis.
MedLine Citation:
PMID:  12491073     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The medicinal leech possesses FMRFamide-like immunoreactivity in neural processes and somata associated with the pharynx and pharyngeal ganglia. The pharynx possessed about 25 immunoreactive somata; about half of the approximately 20 neurons of the pharyngeal ganglia were immunoreactive. We provide brief descriptions of several neurons located in the first neuromere of the subesophageal ganglion involved in controlling pharyngeal motility. Double-labeling experiments indicate that one of these cells, named Swallow neuron 1 (SW1), contains a FMRFamide-like peptide. Stimulation of SW1 caused the mouth to open and the pharynx to dilate. Upon termination of SW1 stimulation, the mouth closed, and a peristaltic wave progressed from the mouth down the length of the pharynx. Stimulation of SW1 did not produce 1:1 postsynaptic potentials in pharyngeal muscle cells. Thus, SW1 is apparently not a motor neuron. The pharynx responded to application of FMRFamide and related peptides by producing a series of 20- to 35-s phasic contractions superimposed upon an increase in basal tonus. The peptide-induced response was quantified by measuring increases in basal tonus, peak tension, and integrated area. Although there were some differences in the order of potency depending upon which parameter was considered, the approximate order of potency of RFamide peptides tested was: pQDPFLRFamide > or = FMRFamide approximately YGGFMRFamide > or = YMRFamide approximately FLRFamide approximately GGKYMRFamide approximately YLRFamide > leucomyosuppressin approximately perisulfakinin. Except for differences in potency, each of the RFamide peptides produced similar contractile waveforms. FMRFamide-induced responses were reduced by the protein kinase C inhibitor bisindolylmaleimide I (10 microM), the nonspecific protein kinase inhibitor H-7 (50 microM), and were increased by the protein phosphatase inhibitor okadaic acid (1 microM). However, the FMRFamide-induced response was unaffected by the protein kinase A inhibitor H-89 (1 microM), the phosphodiesterase inhibitor theophylline (1 mM), the phospholipase A(2) inhibitor OBAA (0.1 microM) or the cation channel blocker amiloride (100 microM).
Authors:
B A O'Gara; P L Brown; D Dlugosch; A Kandiel; J W Ku; J K Geier; N C Henggeler; A Abbasi; N Kounalakis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Invertebrate neuroscience : IN     Volume:  4     ISSN:  1354-2516     ISO Abbreviation:  Invert. Neurosci.     Publication Date:    1999-2000
Date Detail:
Created Date:  2002-12-19     Completed Date:  2003-04-04     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  9602489     Medline TA:  Invert Neurosci     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  41-53     Citation Subset:  IM    
Affiliation:
Department of Biological Sciences, Barnard College of Columbia University, 3009 Broadway, New York, NY 10027-6598, USA. bogara@barnard.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Electrophysiology
Excitatory Postsynaptic Potentials / drug effects,  physiology
FMRFamide / pharmacology*
Immunohistochemistry
Leeches / cytology,  physiology*
Neurons / cytology,  drug effects,  physiology*
Neuropeptides / pharmacology
Organ Culture Techniques
Peristalsis / drug effects,  physiology
Pharyngeal Muscles / drug effects,  physiology
Pharynx / cytology,  drug effects*,  innervation*
Grant Support
ID/Acronym/Agency:
R15 NS30688/NS/NINDS NIH HHS
Chemical
Reg. No./Substance:
0/Neuropeptides; 0/RFamide peptide; 64190-70-1/FMRFamide

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


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