title: Culture media conditioned by heat-shocked osteoblasts enhances the osteogenesis of bone marrow-derived mesenchymal stromal cells.
abstract: Osteogenic cells differentiated from bone marrow-derived mesenchymal stromal cells (MSC) hold much promise in bone tissue engineering and reconstructive surgery. There is a dire need for well-defined and efficient protocols to promote the osteogenesis of ex vivo cultured MSC. Hence, this study investigated whether a combination of chemical stimuli (ascorbic acid, beta-glycerophosphate and dexamethasone) and culture media conditioned by a human foetal osteoblast cell line (hFOB) had any synergistic effect on the osteogenesis of MSC. Conditioned media with or without prior heat shock treatment (42 degrees C for 1 h) of the hFOB cell line, were collected and tested on rabbit MSC cultures, in the presence and absence of chemical stimuli. Osteogenic differentiation of MSC was assessed on both day 14 and 21 of ex vivo culture. The results showed conclusively that conditioned media promoted osteogenesis of MSC, which was further enhanced by prior heat shock-treatment of the hFOB cells, as well as by the presence of chemical stimuli. Among all experimental groups, the combination of culture medium conditioned by heat shocked hFOB cells together with chemical stimuli, exhibited the highest level of calcium mineralization, as assessed by Von Kossa staining. This provides clear evidence of a synergistic effect of conditioned media, heat shock and chemical stimuli. It is hoped that the data may contribute to the development of a more well-defined and efficient in vitro culture protocol to promote the osteogenesis of MSC for both clinical and non-clinical applications.
authors.affiliation: Stem Cell Laboratory, Faculty of Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, 119074 Singapore.
authors.forename: Chao Peng
authors.initials: CP
authors.lastname: Ye
authors.forename: Boon Chin
authors.initials: BC
authors.lastname: Heng
authors.forename: Hua
authors.initials: H
authors.lastname: Liu
authors.forename: Wei Seong
authors.initials: WS
authors.lastname: Toh
authors.forename: Tong
authors.initials: T
authors.lastname: Cao
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology / Q000502:physiology*; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology; D002478:Cells, Cultured; D017077:Culture Media, Conditioned / Q000494:pharmacology; D005260:Female; D018869:Heat-Shock Response / Q000502:physiology*; D008297:Male; D059630:Mesenchymal Stem Cells / Q000187:drug effects / Q000502:physiology*; D010006:Osteoblasts / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D010012:Osteogenesis / Q000187:drug effects / Q000502:physiology*; D011817:Rabbits
chemical_list: D017077:Culture Media, Conditioned