Abstract
Regenerative medicine-based approaches for the repair of damaged cartilage rely on the ability to propagate cells while promoting their chondrogenic potential. Thus, conditions for cell expansion should be optimized through careful environmental control. Appropriate oxygen tension and cell expansion substrates and controllable bioreactor systems are probably critical for expansion and subsequent tissue formation during chondrogenic differentiation. We therefore evaluated the effects of oxygen and microcarrier culture on the expansion and subsequent differentiation of human osteoarthritic chondrocytes. Freshly isolated chondrocytes were expanded on tissue culture plastic or CultiSpher-G microcarriers under hypoxic or normoxic conditions (5% or 20% oxygen partial pressure, respectively) followed by cell phenotype analysis with flow cytometry. Cells were redifferentiated in micromass pellet cultures over 4 weeks, under either hypoxia or normoxia. Chondrocytes cultured on tissue culture plastic proliferated faster, expressed higher levels of cell surface markers CD44 and CD105 and demonstrated stronger staining for proteoglycans and collagen type II in pellet cultures compared with microcarrier-cultivated cells. Pellet wet weight, glycosaminoglycan content and expression of chondrogenic genes were significantly increased in cells differentiated under hypoxia. Hypoxia-inducible factor-3α mRNA was up-regulated in these cultures in response to low oxygen tension. These data confirm the beneficial influence of reduced oxygen on ex vivo chondrogenesis. However, hypoxia during cell expansion and microcarrier bioreactor culture does not enhance intrinsic chondrogenic potential. Further improvements in cell culture conditions are therefore required before chondrocytes from osteoarthritic and aged patients can become a useful cell source for cartilage regeneration.
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Acknowledgements
The authors are grateful to Prof. Dietmar Hutmacher (QUT) for his expert opinion and to Mr. Donald Geyer (QUT) for his assistance with the histology. The antibodies against collagen type II (II-II6B3), CD44 (H4C4), CD45 (H5A5), and CD105 (P4A4), developed by T.F Linsenmayer, J.T. August, J.E.K. Hildreth, and E.A. Wayner, respectively, were obtained from the DSHB developed under the auspices of the NICHD and maintained by The University of Iowa, Department of Biology, Iowa City, IA 52242, USA.
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The authors thank QUT and the Australian Research Council for funding the research described. Dr. Schrobback was supported by a PhD scholarship from QUT. Dr. Klein was supported by an Australian Postdoctoral Fellowship from the Australian Research Council and Dr. Malda was supported by a VENI Fellowship from the Dutch Technology Foundation STW, Applied Science Division of NWO and the Technology Program of the Ministry of Economic Affairs.
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Schrobback, K., Klein, T.J., Crawford, R. et al. Effects of oxygen and culture system on in vitro propagation and redifferentiation of osteoarthritic human articular chondrocytes. Cell Tissue Res 347, 649–663 (2012). https://doi.org/10.1007/s00441-011-1193-7
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DOI: https://doi.org/10.1007/s00441-011-1193-7