Abstract
Children with inflammatory bowel disease are known to be at risk of osteopenia. The cause of this osteopenia is likely to be multifactorial, but the inflammatory process with its characteristic overproduction of cytokines has been implicated. To investigate this possible contribution of the disease activity to the development of osteopenia, we performed in vitro assays of the proliferation of osteoblast-like cells of differing origins in response to the inflammatory cytokines tumor necrosis factor-α and IL-1β. Osteoblast-like cells derived from pediatric bone explants, adherent stromal cells derived from bone marrow (osteoprogenitors), MG-63 osteosarcoma cells, and SV-40 virally transformed osteoprogenitor cells (HCC1) were studied. Tumor necrosis factor-α stimulated the proliferation of cells in primary cultures (i.e. from explants and marrow samples) in a linear, dose-dependent manner. In contrast, inhibition of proliferation was observed with the established cell lines (MG-63 and HCC1). IL-1β stimulated proliferation of all cells apart from the immortalized human bone marrow cell line, HCC1, in which case potent inhibition was observed. We conclude that proinflammatory cytokines are potent regulators of osteoblast-like cell proliferation, and that the responses are specific to cell type. The opposite results obtained with established cell lines compared with the primary cultures suggest that careful consideration should be given to choosing the most suitable cell line for in vitro studies relating to in vivo mechanisms predisposing to osteopenia.
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Abbreviations
- IBD:
-
inflammatory bowel disease
- TNF:
-
tumor necrosis factor
- BMC:
-
bone mineral content
- MEM:
-
minimum essential medium
- DMEM:
-
Dulbecco's modified Eagle medium
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Acknowledgements
The authors thank Carole Elford, Dr. Justin Davies, and Jill Matthews for excellent technical support. We also thank Declan O'Docherty and Geoff Graham for providing bone samples, and Dr. Meriel Jenney for providing bone marrow samples. We also thank Dr. Brian Ashton for providing the HCC1 cells.
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Supported by Crohn's in Childhood Research Association (CICRA).
Dr. B.A.J. Evan, Department of Child Health, University of Wales College of Medicine, Heath Park, Cardiff CF14 4XN, U.K.
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Harbour, M., Gregory, J., Jenkins, H. et al. Proliferative Response of Different Human Osteoblast-like Cell Models to Proinflammatory Cytokines. Pediatr Res 48, 163–168 (2000). https://doi.org/10.1203/00006450-200008000-00008
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DOI: https://doi.org/10.1203/00006450-200008000-00008
