Effect of reduced oxygen tension on chondrogenesis and osteogenesis in adipose-derived mesenchymal cells

Stanford University, Palo Alto, California, United States
AJP Cell Physiology (Impact Factor: 3.78). 05/2006; 290(4):C1139-46. DOI: 10.1152/ajpcell.00415.2005
Source: PubMed

ABSTRACT Recent studies have demonstrated that adipose-derived mesenchymal cells (AMCs) offer great promise for cell-based therapies because of their ability to differentiate toward bone, cartilage, and fat. Given that cartilage is an avascular tissue and that mesenchymal cells experience hypoxia during prechondrogenic condensation in endochondral ossification, the goal of this study was to understand the influence of oxygen tension on AMC differentiation into bone and cartilage. In vitro chondrogenesis was induced using a three-dimensional micromass culture model supplemented with TGF-beta1. Collagen II production and extracellular matrix proteoglycans were assessed with immunohistochemistry and Alcian blue staining, respectively. Strikingly, micromasses differentiated in reduced oxygen tension (2% O(2)) showed markedly decreased chondrogenesis. Osteogenesis was induced using osteogenic medium supplemented with retinoic acid or vitamin D and was assessed with alkaline phosphatase activity and mineralization. AMCs differentiated in both 21 and 2% O(2) environments. However, osteogenesis was severely diminished in a low-oxygen environment. These data demonstrated that hypoxia strongly inhibits in vitro chondrogenesis and osteogenesis in AMCs.

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    • "The direct interaction between vascular endothelial cells and bone-forming osteoblasts leads to deposition of osteoid and begin of the mineralization process [19]. In cell culture experiments in vitro, a reduced oxygen tension has been accompanied by an increased proliferation rate and a decreased differentiation capacity of stem and osteoprogenitor cells compared to normoxic culture conditions [20] [21] [22] [23] [24] [25] [26]. Therefore, it is of great importance to monitor oxygen concentration inside bioreactors and even more inside scaffolds during the cultivation process. "
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    ABSTRACT: A three-dimensional computational fluid dynamics- (CFD-) model based on a differential pressure laminar flow bioreactor prototype was developed to further examine performance under changing culture conditions. Cell growth inside scaffolds was simulated by decreasing intrinsic permeability values and led to pressure build-up in the upper culture chamber. Pressure release by an integrated bypass system allowed continuation of culture. The specific shape of the bioreactor culture vessel supported a homogenous flow profile and mass flux at the scaffold level at various scaffold permeabilities. Experimental data showed an increase in oxygen concentration measured inside a collagen scaffold seeded with human mesenchymal stem cells when cultured in the perfusion bioreactor after 24 h compared to static culture in a Petri dish (dynamic: 11% O 2 versus static: 3% O 2 ). Computational fluid simulation can support design of bioreactor systems for tissue engineering application.
    08/2015; 2015(3):1-9. DOI:10.1155/2015/320280
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    • "In addition, Lawyer, et al. [35] demonstrated that hypoxia stabilized the expression of HIF-1a in chondrocytes in comparison to normoxia . Given the fact that cartilage tissue is physiologically adapted to a lower oxygen tension compared to other tissues [23], we suggest that ASCs have a greater potential to undergo chondrogenic differentiation at oxygen levels as low as 2% O 2 than at higher oxygen tension. "
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    ABSTRACT: Adipose-derived stem cells (ASCs) have been found adapted to a specific niche with low oxygen tension (hypoxia) in the body. As an important component of this niche, oxygen tension has been known to play a critical role in the maintenance of stem cell characteristics. However, the effect of O2 tension on their functional properties has not been well determined. In this study, we investigated the effects of O2 tension on ASCs stemness, differentiation and proliferation ability. Human ASCs were cultured under normoxia (21% O2) and hypoxia (2% O2). We found that hypoxia increased ASC stemness marker expression and proliferation rate without altering their morphology and surface markers. Low oxygen tension further enhances the chondrogenic differentiation ability, but reduces both adipogenic and osteogenic differentiation potential. These results might be correlated with the increased expression of HIF-1α under hypoxia. Taken together, we suggest that growing ASCs under 2% O2 tension may be important in expanding ASCs effectively while maintaining their functional properties for clinical therapy, particularly for the treatment of cartilage defects.
    Biochemical and Biophysical Research Communications 05/2014; 448(2). DOI:10.1016/j.bbrc.2014.04.096 · 2.30 Impact Factor
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    • "Recent research shows that the MSCs' function is related to the substrate stiffness which could be adjusted by fiber-reinforced methods [98, 99]. As the disc cell lives in hypoxia, it has been proved that MSC differentiation shows better cell survival rate and activity under low oxygen environment [100]. By controlling technology and fiber density, FRMs could obtain nanoscale 3D cell growth space and fulfill the oxygen concentration control. "
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    ABSTRACT: The intervertebral disc degeneration and injury are the most common spinal diseases with tremendous financial and social implications. Regenerative therapies for disc repair are promising treatments. Fiber-reinforced materials (FRMs) are a kind of composites by embedding the fibers into the matrix materials. FRMs can maintain the original properties of the matrix and enhance the mechanical properties. By now, there are still some problems for disc repair such as the unsatisfied static strength and dynamic properties for disc implants. The application of FRMs may resolve these problems to some extent. In this review, six parts such as background of FRMs in tissue repair, the comparison of mechanical properties between natural disc and some typical FRMs, the repair standard and FRMs applications in disc repair, and the possible research directions for FRMs' in the future are stated.
    12/2013; 2013:714103. DOI:10.1155/2013/714103
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