High mucosal serotonin availability in neonatal guinea pig ileum is associated with low serotonin transporter expression |
| |
Authors: | Bian Xiaochun Patel Bhavik Dai Xiaoling Galligan James J Swain Greg |
| |
Affiliation: | Department of Pharmacology & Toxicology, Michigan State University, East Lansing, Michigan 48824, USA. |
| |
Abstract: | BACKGROUND & AIMS: 5-Hydroxytryptamine (5-HT) is a neurotransmitter and paracrine signaling molecule in the gut. Paracrine signaling by enterochromaffin cells (EC), which release 5-HT, has not been studied in neonates. Our aim was to compare 5-HT disposition in the intestinal mucosa of neonatal and adult guinea pigs. METHODS: 5-HT was locally measured in vitro from intestinal segments using a diamond microelectrode and continuous amperometry. The serotonin transporter (SERT) was measured using immunohistochemical and Western blot techniques. 5-HT intestinal content was measured using immunohistochemistry and high-performance liquid chromatography with electrochemical detection. RESULTS: An oxidation current, reflective of local 5-HT release, was recorded with the microelectrode near the mucosal surface, and this current was larger in neonatal than in adult tissues. Mechanically stimulating the mucosa with a fine glass probe evoked an additional current in adult but not neonatal tissues. Oxidation currents were reduced by tetrodotoxin and were blocked in calcium-free solutions. Fluoxetine (1 microM) potentiated oxidation currents in adult but not neonatal tissues. SERT levels were lower in neonatal vs adult tissues. There was no difference in 5-HT content between neonates and adults but 5-hydroxyindole acetic acid/5-HT ratios were higher in adults. EC cell counts showed no difference in cell number, but EC cells were found in the crypts in neonatal and along the villi in adult tissues. CONCLUSIONS: SERT expression is low in neonates, and this is associated with high levels of free mucosal 5-HT and reduced metabolism. Postnatal maturation of 5-HT signaling may be important for development of neurohumoral control of intestinal motor reflexes. |
| |
Keywords: | EC, enterochromaffin ENS, enteric nervous system 5-HIAA, 5-hydroxyindole acetic acid HPLC, high-performance liquid chromatography 5-HT, 5-hydroxytryptamine ir, immunoreactivity SERT, serotonin transporter TTX, tetrodotoxin |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|