title: Substance P and calcitonin gene-related neuropeptides as novel growth factors for ex vivo expansion of cord blood CD34(+) hematopoietic stem cells.
abstract: There is little evidence on roles of growth factors other than cytokines in expansion of cord blood (CB) stem cells. We aimed to explore a novel approach for expansion, using Substance P (SP) and calcitonin gene-related peptide (CGRP) neuropeptides. CB CD34(+) cells were cultured in different concentrations of SP and/or CGRP in combination with a cytokine cocktail. Phenotypic and functional analysis was performed by flowcytometry and colonogenic assay. Our results show a significant improvement of total expansion of neuropeptide treated cells. There was a selective effect of CGRP on CD34(+) CD133(+) cells, SP on CD34(+) CD45(dim) cells, and 10(- 9) M SP and/or CGRP on expansion of CD34(+) CD38(- ) cells. There was also a tendency for erythroid and granulocyte-myeloid colony formation in SP and CGRP treated cultures, respectively. Supplementation of cytokines with other growth factors, such as neuropeptides, might enable us to overcome the difficulties of ex vivo expansion of CB cells.
authors.affiliation: Department of Immunology, School of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
authors.forename: Somayeh
authors.initials: S
authors.lastname: Shahrokhi
authors.forename: Massoumeh
authors.initials: M
authors.lastname: Ebtekar
authors.forename: Kamran
authors.initials: K
authors.lastname: Alimoghaddam
authors.forename: Ali Akbar
authors.initials: AA
authors.lastname: Pourfathollah
authors.forename: Maryam
authors.initials: M
authors.lastname: Kheirandish
authors.forename: Alireza
authors.initials: A
authors.lastname: Ardjmand
authors.forename: Ahmad Reza
authors.initials: AR
authors.lastname: Shamshiri
authors.forename: Ardeshir
authors.initials: A
authors.lastname: Ghavamzadeh
mesh_terms: D018952:Antigens, CD34 / Q000378:metabolism*; D015740:Calcitonin Gene-Related Peptide / Q000378:metabolism / Q000494:pharmacology*; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D003470:Culture Media; D016207:Cytokines / Q000378:metabolism; D005312:Fetal Blood / Q000166:cytology*; D005434:Flow Cytometry; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000187:drug effects*; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000494:pharmacology*; D009479:Neuropeptides / Q000494:pharmacology; D013373:Substance P / Q000494:pharmacology*
chemical_list: D018952:Antigens, CD34; D003470:Culture Media; D016207:Cytokines; D036341:Intercellular Signaling Peptides and Proteins; D009479:Neuropeptides; D013373:Substance P; D015740:Calcitonin Gene-Related Peptide