Interactions of serotoninergic, cholinergic, and tachykinin-containing nerve elements in the rabbit small intestine
| Autor: | Robert Gábriel, Agnes NÉMeth, Márta Wilhelm, Viktoria Denes |
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| Rok vydání: | 2009 |
| Předmět: |
Male
medicine.medical_specialty Serotonin Histology Myenteric Plexus Biology In Vitro Techniques Serotonergic chemistry.chemical_compound Ileum Internal medicine Tachykinins medicine Animals Receptor Ecology Evolution Behavior and Systematics 5-HT receptor Myenteric plexus Excitation Contraction Coupling Neurons Choline acetyltransferase Endocrinology chemistry Cholinergic Fibers Receptors Serotonin Cholinergic Hexamethonium Female Rabbits Anatomy Gastrointestinal Motility Biotechnology |
| Zdroj: | Anatomical record (Hoboken, N.J. : 2007). 292(10) |
| ISSN: | 1932-8494 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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