Document Detail

Interactions of serotoninergic, cholinergic, and tachykinin-containing nerve elements in the rabbit small intestine.
MedLine Citation:
PMID:  19685504     Owner:  NLM     Status:  MEDLINE    
This report presents novel results on the effects of serotonin (5-HT) on longitudinal muscle contractions in the rabbit ileum and the interactions of serotonin with some neuronal elements of the myenteric plexus. We showed previously that serotonin-triggered contractions involved two mechanisms in the rabbit ileum: neuronal excitation (via 5-HT(2) receptors in the neurons) and direct muscular stimulation (via 5-HT(4) receptors in the muscle). Here, we focus on the neuronal 5-HT(2) receptor pathway and report further pharmacological and immunocytochemical data clarifying the details of the mechanisms. We observed that antagonists for neurokinin (NK1 and NK2) receptors partially blocked the serotonin response, but NK3 receptor antagonists had no effect. Pretreatment by atropine (ATR) eliminated the NK1 receptor antagonist resistant contractions. In contrast, the NK1 antagonist did not depress the ATR-resistant contraction when ATR was added first. 5-HT(2) receptor agonist-induced contractions were partially suppressed by ATR, hexamethonium, and NK1 or NK2 receptor antagonists. In conclusion, serotonin acting through 5-HT(2) receptors could stimulate interneurons and excitatory motor neurons. Immunocytochemical staining revealed an extensive tachykinin-immunoreactive (IR) network in the myenteric plexus. Approximately 52% of all myenteric neurons were labeled. 5-HT-IR fibers could be detected around both choline acetyltransferase- and tachykinin-IR cells, suggesting functional relationships between them. Consistent with our pharmacological observations, we found that immunopositive nerve elements for 5-HT(2A) receptor and double-labeled immunostaining revealed a remarkable overlap between tachykinin-IR neurons and 5-HT(2A)-IR elements.
Viktoria D??nes; Marta Wilhelm; Agnes N??meth; Robert G??briel
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Publication Detail:
Type:  In Vitro; Journal Article    
Journal Detail:
Title:  Anatomical record (Hoboken, N.J. : 2007)     Volume:  292     ISSN:  1932-8494     ISO Abbreviation:  Anat Rec (Hoboken)     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-09-29     Completed Date:  2009-12-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101292775     Medline TA:  Anat Rec (Hoboken)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1548-58     Citation Subset:  IM    
Department of Experimental Zoology and Neurobiology, University of P??cs, H-7601 Pe??s, Ifj??s??g u. 6, Hungary.
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MeSH Terms
Cholinergic Fibers / metabolism
Excitation Contraction Coupling*
Gastrointestinal Motility*
Ileum / metabolism*
Myenteric Plexus / metabolism
Neurons / metabolism*
Receptors, Serotonin / metabolism
Serotonin / metabolism*
Tachykinins / metabolism
Reg. No./Substance:
0/Receptors, Serotonin; 0/Tachykinins; 50-67-9/Serotonin

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

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