Document Detail

The neuropeptide red pigment concentrating hormone affects rhythmic pattern generation at multiple sites.
MedLine Citation:
PMID:  8509827     Owner:  NLM     Status:  MEDLINE    
1. The cardiac sac network, which controls the rhythmic contractions of the cardiac sac in the foregut of crustaceans, is distributed throughout the stomatogastric nervous system, including the oesophageal ganglion (OG), the commissural ganglia (CGs), and the stomatogastric ganglion (STG). A red pigment-concentrating hormone (RPCH)-like peptide is likewise widely distributed. 2. The effects that bath application of the neuropeptide RPCH to the different ganglia has on the cardiac sac pattern were studied. 3. RPCH applied to the STG, the OG, or the CGs elicited bursting activity in all the known components of the cardiac sac pattern, including the two motor neurons, cardiac sac dilators 1 and 2 (CD1 and CD2), and the inferior ventricular nerve (ivn) fibers. 4. A cardiac sac pattern was also elicited when RPCH was applied to either the STG, the OG, or the CGs after synapses in that ganglion had been blocked by low Ca2+ saline containing 20 mM Co2+. 5. These data suggest that the ivn fibers are sensitive to RPCH and respond to it by generating bursting activity at or near their terminals in all four ganglia. 6. Application of RPCH to either the STG or the OG also caused an increase in the amplitude of the postsynaptic potential (PSP) from the ivn fibers to both CD1 and CD2. The increase was largest in the ganglion to which the RPCH was applied. 7. Repeated stimulation of the ivn, mimicking the bursts that occur during cardiac sac activity, also caused an increase in PSP amplitude, and so facilitation resulting from activation of ivn bursting could account for a portion of the increased amplitude seen in RPCH.(ABSTRACT TRUNCATED AT 250 WORDS)
P S Dickinson; C Mecsas; J Hetling; K Terio
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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.    
Journal Detail:
Title:  Journal of neurophysiology     Volume:  69     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  1993 May 
Date Detail:
Created Date:  1993-07-15     Completed Date:  1993-07-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1475-83     Citation Subset:  IM    
Department of Biology, Bowdoin College, Brunswick, Maine 04011.
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MeSH Terms
Central Nervous System / physiology*
Culture Techniques
Ganglia / physiology*
Gastrointestinal Motility / physiology*
Invertebrate Hormones / physiology*
Membrane Potentials / physiology
Nephropidae / physiology*
Nerve Fibers / physiology
Nerve Net / physiology*
Neurons / physiology
Oligopeptides / physiology*
Pyrrolidonecarboxylic Acid / analogs & derivatives
Reg. No./Substance:
0/Invertebrate Hormones; 0/Oligopeptides; 37933-92-9/red pigment-concentrating hormone; 98-79-3/Pyrrolidonecarboxylic Acid

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