AIM AND METHODS: Enterochromaffin (EC) cells, interspersed throughout the gastrointestinal mucosa, provide most of the serotonin of the body and control intestinal motility, secretion and absorption. We purified EC cells from the rat ileum by a combination of elutriation and density gradient centrifugation in order to characterize the function of this important cell type. RESULTS: Immunostaining showed that there were 84% serotonin-positive cells in the highly enriched EC fraction as compared with 12% in unfractionated cells, yielding a approximately sevenfold enrichment. Serotonin measurements in the cell suspensions indicated a seven to 14-fold enrichment. Presence of alpha- and beta-adrenoreceptor isoforms, muscarinic M3 and gama-aminobutyric acid (GABA)-A receptors was confirmed by RT-PCR and cytochemistry. Increased expression of VMAT-1 and GABA-A mRNA was also shown by quantitative TaqMan PCR using EC cell RNA. Serotonin release in isolated EC cells was stimulated by noradrenaline, and to a smaller extent, by carbachol, while GABA addition was without effect. CONCLUSION: Our data provide a basis for a new approach to characterize receptors on this unique cell type.
AIM AND METHODS: Enterochromaffin (EC) cells, interspersed throughout the gastrointestinal mucosa, provide most of the serotonin of the body and control intestinal motility, secretion and absorption. We purified EC cells from the rat ileum by a combination of elutriation and density gradient centrifugation in order to characterize the function of this important cell type. RESULTS: Immunostaining showed that there were 84% serotonin-positive cells in the highly enriched EC fraction as compared with 12% in unfractionated cells, yielding a approximately sevenfold enrichment. Serotonin measurements in the cell suspensions indicated a seven to 14-fold enrichment. Presence of alpha- and beta-adrenoreceptor isoforms, muscarinic M3 and gama-aminobutyric acid (GABA)-A receptors was confirmed by RT-PCR and cytochemistry. Increased expression of VMAT-1 and GABA-A mRNA was also shown by quantitative TaqMan PCR using EC cell RNA. Serotonin release in isolated EC cells was stimulated by noradrenaline, and to a smaller extent, by carbachol, while GABA addition was without effect. CONCLUSION: Our data provide a basis for a new approach to characterize receptors on this unique cell type.
Authors: S Vincent Wu; Pu-Qing Yuan; Jim Lai; Kelvin Wong; Monica C Chen; Gordon V Ohning; Yvette Taché Journal: Endocrinology Date: 2010-12-01 Impact factor: 4.736
Authors: Ravinarayan Raghupathi; Michael D Duffield; Leah Zelkas; Adrian Meedeniya; Simon J H Brookes; Tiong Cheng Sia; David A Wattchow; Nick J Spencer; Damien J Keating Journal: J Physiol Date: 2013-10-07 Impact factor: 5.182
Authors: Marie Hagbom; Claudia Istrate; David Engblom; Thommie Karlsson; Jesus Rodriguez-Diaz; Javier Buesa; John A Taylor; Vesa-Matti Loitto; Karl-Eric Magnusson; Håkan Ahlman; Ove Lundgren; Lennart Svensson Journal: PLoS Pathog Date: 2011-07-14 Impact factor: 6.823