title: Aging effect on neurotrophic activity of human mesenchymal stem cells.
abstract: Clinical efficacy of stem cells for nerve repair is likely to be influenced by issues including donor age and in vitro expansion time. We isolated human mesenchymal stem cells (MSC) from bone marrow of young (16-18 years) and old (67-75 years) donors and analyzed their capacity to differentiate and promote neurite outgrowth from dorsal root ganglia (DRG) neurons. Treatment of MSC with growth factors (forskolin, basic fibroblast growth factor, platelet derived growth factor-AA and glial growth factor-2) induced protein expression of the glial cell marker S100 in cultures from young but not old donors. MSC expressed various neurotrophic factor mRNA transcripts. Growth factor treatment enhanced the levels of BDNF and VEGF transcripts with corresponding increases in protein release in both donor cell groups. MSC in co-culture with DRG neurons significantly enhanced total neurite length which, in the case of young but not old donors, was further potentiated by treatment of the MSC with the growth factors. Stem cells from young donors maintained their proliferation rate over a time course of 9 weeks whereas those from the old donors showed increased population doubling times. MSC from young donors, differentiated with growth factors after long-term culture, maintained their ability to enhance neurite outgrowth of DRG. Therefore, MSC isolated from young donors are likely to be a favourable cell source for nerve repair.
authors.affiliation: Department of Integrative Medical Biology, Section of Anatomy, Umeå University, Umeå, Sweden.
authors.forename: Maria
authors.initials: M
authors.lastname: Brohlin
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Kingham
authors.forename: Liudmila N
authors.initials: LN
authors.lastname: Novikova
authors.forename: Lev N
authors.initials: LN
authors.lastname: Novikov
authors.forename: Mikael
authors.initials: M
authors.lastname: Wiberg
mesh_terms: D000293:Adolescent; D000368:Aged; D000375:Aging / Q000378:metabolism*; D002454:Cell Differentiation; D002460:Cell Line; D049109:Cell Proliferation; D048430:Cell Shape; D018920:Coculture Techniques; D005727:Ganglia, Spinal / Q000166:cytology; D005786:Gene Expression Regulation; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000378:metabolism*; D009414:Nerve Growth Factors / Q000235:genetics / Q000378:metabolism*; D016501:Neurites / Q000378:metabolism; D009418:S100 Proteins / Q000235:genetics / Q000378:metabolism; D013997:Time Factors
chemical_list: D009414:Nerve Growth Factors; D009418:S100 Proteins