title: Serotonin and its transporter on proliferation of fetal heart cells.
abstract: Besides neuronal transmission, serotonin (5-HT) also acts as a trophic signal during the development of the central nervous and neural crest systems. In this study, we report that in addition to trophic effect, 5-HT increases the proliferation of fetal heart cells. We showed for the first time that the cultured heart cells, express serotonin transporter (5-HTT), which confirmed the previously observed accumulation of 5-HT in developing heart. The influence of 5-HT on developing heart cells is studied throughout the dosage. We found that 5-HT concentration at physiological level, 4 microM, permits an optimal proliferation of heart cells as indicated by the number of 5-bromo-deoxyuridine immunoreactive (BrdU-im) cells and myosin heavy chain immunoreactive cells (MF20-im); fluctuation towards either concentrations reduce the proliferation. We hypothesized that 5-HTT plays a role in the heart development. Our study indicated that the blockade of 5-HT uptake by paroxetine decreased the number of BrdU-im cells and MF20-im cells. These data indicate a role of 5-HT and 5-HTT on heart development. Abnormal 5-HT level or misuse of 5-HT uptake blocker may alter the heart development.
authors.affiliation: Department of Anatomy and Cell Biology, Indiana University School of Medicine, MS508, Indianapolis, IN 46202, USA.
authors.forename: Youssef
authors.initials: Y
authors.lastname: Sari
authors.forename: Feng C
authors.initials: FC
authors.lastname: Zhou
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001973:Bromodeoxyuridine / Q000378:metabolism; D002352:Carrier Proteins / Q000378:metabolism*; D002452:Cell Count; D002455:Cell Division / Q000187:drug effects / Q000502:physiology; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D004622:Embryo, Mammalian; D005260:Female; D005318:Fetal Heart / Q000166:cytology* / Q000378:metabolism; D007150:Immunohistochemistry; D008297:Male; D008562:Membrane Glycoproteins / Q000378:metabolism*; D026901:Membrane Transport Proteins; D032383:Myocytes, Cardiac / Q000187:drug effects / Q000378:metabolism; D018995:Myosin Heavy Chains / Q000378:metabolism; D009419:Nerve Tissue Proteins; D017374:Paroxetine / Q000494:pharmacology; D011247:Pregnancy; D051381:Rats; D017207:Rats, Sprague-Dawley; D012701:Serotonin / Q000378:metabolism*; D050486:Serotonin Plasma Membrane Transport Proteins; D017367:Selective Serotonin Reuptake Inhibitors / Q000494:pharmacology
chemical_list: D001973:Bromodeoxyuridine; D002352:Carrier Proteins; D008562:Membrane Glycoproteins; D026901:Membrane Transport Proteins; D018995:Myosin Heavy Chains; D009419:Nerve Tissue Proteins; D017374:Paroxetine; D012701:Serotonin; D050486:Serotonin Plasma Membrane Transport Proteins; D017367:Selective Serotonin Reuptake Inhibitors; C493232:Slc6a4 protein, rat