title: Bone mesenchymal stromal cells stimulate neurite outgrowth of spinal neurons by secreting neurotrophic factors.
abstract: It has been demonstrated that bone mesenchymal stromal cells (BMSCs) stimulate neurite outgrowth from dorsal root ganglion (DRG) neurons. The present in vitro study tested the hypothesis that BMSCs stimulate the neurite outgrowth from spinal neurons by secreting  neurotrophic factors. Spinal neurons were cocultured with BMSCs, fibroblasts and control medium in a non-contact system. Neurite outgrowth of spinal neurons cocultured with BMSCs was significantly greater than the neurite outgrowth observed in neurons cultured with control medium or with fibroblasts.  In addition, BMSC-conditioned medium increased the length of neurites from spinal neurons compared to those of neurons cultured in the control medium or in the fibroblasts-conditioned medium. BMSCs expressed brain-derived neurotrophic factor (BDNF) and glial cell line-derived neurotrophic  factor (GDNF). The concentrations of BDNF and GDNF in BMSC-conditioned medium were 132±12 and 70±6 pg ml(-1), respectively. The addition of anti-BDNF and anti-GDNF antibodies to BMSC-conditioned medium partially blocked the neurite-promoting effect of the BMSC-conditioned  medium. In conclusion, our results demonstrate that BMSCs promote neurite outgrowth in spinal neurons by secreting soluble factors. The neurite-promoting effect of BMSCs is partially mediated by BDNF and GDNF.
authors.affiliation: Shanghai Minhang Central Hospital, Shanghai, China.
authors.forename: Weidong
authors.initials: W
authors.lastname: Gu
authors.forename: Fujun
authors.initials: F
authors.lastname: Zhang
authors.forename: Qingsheng
authors.initials: Q
authors.lastname: Xue
authors.forename: Zhengwen
authors.initials: Z
authors.lastname: Ma
authors.forename: Peihua
authors.initials: P
authors.lastname: Lu
authors.forename: Buwei
authors.initials: B
authors.lastname: Yu
mesh_terms: D000818:Animals; D019208:Brain-Derived Neurotrophic Factor / Q000096:biosynthesis*; D018920:Coculture Techniques; D017077:Culture Media, Conditioned / Q000737:chemistry; D004797:Enzyme-Linked Immunosorbent Assay; D005455:Fluorescent Antibody Technique; D005727:Ganglia, Spinal / Q000378:metabolism; D051100:Glial Cell Line-Derived Neurotrophic Factor / Q000096:biosynthesis*; D008297:Male; D059630:Mesenchymal Stem Cells / Q000378:metabolism*; D016501:Neurites / Q000378:metabolism; D009474:Neurons / Q000166:cytology / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D017077:Culture Media, Conditioned; D051100:Glial Cell Line-Derived Neurotrophic Factor