title: Promoting effects of serotonin on hematopoiesis: ex vivo expansion of cord blood CD34+ stem/progenitor cells, proliferation of bone marrow stromal cells, and antiapoptosis.
abstract: Serotonin is a monoamine neurotransmitter that has multiple extraneuronal functions. We previously reported that serotonin exerted mitogenic stimulation on megakaryocytopoiesis mediated by 5-hydroxytryptamine (5-HT)2 receptors. In this study, we investigated effects of serotonin on ex vivo expansion of human cord blood CD34+ cells, bone marrow (BM) stromal cell colony-forming unit-fibroblast (CFU-F) formation, and antiapoptosis of megakaryoblastic M-07e cells. Our results showed that serotonin at 200 nM significantly enhanced the expansion of CD34+ cells to early stem/progenitors (CD34+ cells, colony-forming unit-mixed [CFU-GEMM]) and multilineage committed progenitors (burst-forming unit/colony-forming unit-erythroid [BFU/CFU-E], colony-forming unit-granulocyte macrophage, colony-forming unit-megakaryocyte, CD61+ CD41+ cells). Serotonin also increased nonobese diabetic/severe combined immunodeficient repopulating cells in the expansion culture in terms of human CD45+, CD33+, CD14+ cells, BFU/CFU-E, and CFU-GEMM engraftment in BM of animals 6 weeks post-transplantation. Serotonin alone or in addition to fibroblast growth factor, platelet-derived growth factor, or vascular endothelial growth factor stimulated BM CFU-F formation. In M-07e cells, serotonin exerted antiapoptotic effects (annexin V, caspase-3, and propidium iodide staining) and reduced mitochondria membrane potential damage. The addition of ketanserin, a competitive antagonist of 5-HT2 receptor, nullified the antiapoptotic effects of serotonin. Our data suggest the involvement of serotonin in promoting hematopoietic stem cells and the BM microenvironment. Serotonin could be developed for clinical ex vivo expansion of hematopoietic stem cells for transplantation. Disclosure of potential conflicts of interest is found at the end of this article.
authors: Li Ka Shing Institute of Health Sciences, Department of Paediatrics, The Chinese University of Hong Kong, Hong Kong, China.
authors: Mo
authors: M
authors: Yang
authors: Karen
authors: K
authors: Li
authors: Pak Cheung
authors: PC
authors: Ng
authors: Carmen Ka Yee
authors: CK
authors: Chuen
authors: Tze Kin
authors: TK
authors: Lau
authors: Yuan Shan
authors: YS
authors: Cheng
authors: Yuan Sheng
authors: YS
authors: Liu
authors: Chi Kong
authors: CK
authors: Li
authors: Patrick Man Pan
authors: PM
authors: Yuen
authors: Anthony Edward
authors: AE
authors: James
authors: Shuk Man
authors: SM
authors: Lee
authors: Tai Fai
authors: TF
authors: Fok
mesh_terms: D000818:Animals; D017304:Annexin A5 / Q000378:metabolism; D018952:Antigens, CD34 / Q000378:metabolism*; D017209:Apoptosis / Q000187:drug effects*; D001854:Bone Marrow Cells / Q000166:cytology / Q000187:drug effects; D053148:Caspase 3 / Q000378:metabolism; D049109:Cell Proliferation / Q000187:drug effects; D005312:Fetal Blood / Q000166:cytology* / Q000187:drug effects / Q000201:enzymology; D006410:Hematopoiesis / Q000187:drug effects*; D018380:Hematopoietic Stem Cell Transplantation; D006801:Humans; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D051379:Mice; D016513:Mice, SCID; D012701:Serotonin / Q000494:pharmacology*; D013234:Stem Cells / Q000166:cytology / Q000187:drug effects* / Q000201:enzymology; D017154:Stromal Cells / Q000166:cytology* / Q000187:drug effects
chemical_list: D017304:Annexin A5; D018952:Antigens, CD34; D012701:Serotonin; D053148:Caspase 3