Angiogenesis in ischemic tissue produced by spheroid grafting of human adipose-derived stromal cells

Bhang, Suk Ho; Cho, Seung Woo; La, Wan Geun; Lee, Tae Jin; Yang, Hee Seok; Sun, Ah Young; Baek, Sang Hong; Rhie, Jong Won; Kim, Byung Soo

doi:10.1016/j.biomaterials.2010.12.035

Cited by 328 publications

(339 citation statements)

References 47 publications

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“…[2][3][4] The presence of extracellular matrix (ECM) proteins, such as collagen, fibronectin, and laminin, can also act to contract the aggregate of cells into a spheroid. 5 Once the cells of interest are grown into spheroids, there are several applications both in vivo and in vitro, including injection after an injury, 6 high-throughput assay to test compounds of interest, 7 and enhancement of microvessel formation. 8 Spheroids provide a three-dimensional (3D) niche that allows cells to interact with surrounding cells and ECM in all directions.…”

Section: Introductionmentioning

confidence: 99%

Physiologically Low Oxygen Enhances Biomolecule Production and Stemness of Mesenchymal Stem Cell Spheroids

Shearier

Xing

Qian

et al. 2016

Tissue Engineering Part C: Methods

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Multicellular human mesenchymal stem cell (hMSC) spheroids have been demonstrated to be valuable in a variety of applications, including cartilage regeneration, wound healing, and neoangiogenesis. Physiological relevant low oxygen culture can significantly improve in vitro hMSC expansion by preventing cell differentiation. We hypothesize that hypoxia-cultured hMSC spheroids can better maintain the regenerative properties of hMSCs. In this study, hMSC spheroids were fabricated using hanging drop method and cultured under 2% O 2 and 20% O 2 for up to 96 h. Spheroid diameter and viability were examined, as well as extracellular matrix (ECM) components and growth factor levels between the two oxygen tensions at different time points. Stemness was measured among the spheroid culture conditions and compared to two-dimensional cell cultures. Spheroid viability and structural integrity were studied using different needle gauges to ensure no damage would occur when implemented in vivo. Spheroid attachment and integration within a tissue substitute were also demonstrated. The results showed that a three-dimensional hMSC spheroid cultured at low oxygen conditions can enhance the production of ECM proteins and growth factors, while maintaining the spheroids' stemness and ability to be injected, attached, and potentially be integrated within a tissue.

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Section: Introductionmentioning

confidence: 99%

Physiologically Low Oxygen Enhances Biomolecule Production and Stemness of Mesenchymal Stem Cell Spheroids

Shearier

Xing

Qian

et al. 2016

Tissue Engineering Part C: Methods

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“…Therefore, multicellular spheroids are considered useful in vitro systems for drug screening, including tests of drug metabolism and toxicity, [1][2][3][4][5][6] and for studying tumor metastasis. 7,8) Furthermore, such spheroids have attracted much attention for application in cell-based therapy [9][10][11] and as a building block for the construction of large tissues. 12,13) In a previous study, we demonstrated that spheroid formation greatly prolonged the survival of insulinsecreting NIT-1 cells after transplantation in mice.…”

mentioning

confidence: 99%

Optimization of Albumin Secretion and Metabolic Activity of Cytochrome P450 1A1 of Human Hepatoblastoma HepG2 Cells in Multicellular Spheroids by Controlling Spheroid Size

Nishikawa

Tanaka

Nishikawa

et al. 2017

Biological & Pharmaceutical Bulletin

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Key words albumin; CYP1A1; human hepatoblastoma HepG2 cell; size control; spheroid Three-dimensional multicellular spheroids possess greater in vivo tissue-like morphology and function than two-dimensional monolayered cells. Therefore, multicellular spheroids are considered useful in vitro systems for drug screening, including tests of drug metabolism and toxicity, [1][2][3][4][5][6] and for studying tumor metastasis. 7,8) Furthermore, such spheroids have attracted much attention for application in cell-based therapy [9][10][11] and as a building block for the construction of large tissues. 12,13) In a previous study, we demonstrated that spheroid formation greatly prolonged the survival of insulinsecreting NIT-1 cells after transplantation in mice. 9)Spheroid size is a key parameter to determine the functions and properties of spheroids. It is reported that oxygen concentration is decreased in the core of the spheroids of human hepatoblastoma HepG2 cells, hepatocytes, and tumor cells. [14][15][16][17] This affects the expression of various molecules, including hypoxia inducible factor (HIF)-1. In addition, paracellular or transcellular transport is required in order for the inner cells to take up extracellular materials and to release secretory products into the culture media. Despite their importance, details regarding the relationship between spheroid size and cellular functions remain to be elucidated. In particular, few studies have investigated the effect of spheroid sizes over 300 µm on their functions and properties.Investigating the effects of spheroid size requires the preparation of size-controlled, multicellular spheroids. Several techniques for spheroid formation have been reported, including the spinner flask, hanging drop, and liquid overlay methods. [18][19][20] However, a common problem with these techniques is the difficulty in controlling spheroid size. In contrast, microfabrication is suitable for the development of sizecontrolled microwells with narrow size distribution. 10,21,22) In a previous study, we demonstrated that polydimethylsiloxane (PDMS)-based microwells constructed using a microfabrication technique could be used to obtain spheroids with a very narrow size distribution. 23) We also found that coating the microwells with poly(N-isopropylacrylamide) (PNIPAAm), a thermoresponsive polymer, increased the quality of the spheroids, since the coating prevented the cells from adhering to the PDMS-based microwells. 23)In the present study, we developed PDMS-based microwells of different sizes in order to prepare variably sized multicellular spheroids. HepG2 cells were used for the study as they represent one of the most extensively used cell lines to evaluate drug metabolism and toxicity. 3,24,25) Production of various proteins is an index of liver function. Albumin is the most abundant serum protein produced by hepatocytes. 26)Another important liver function is the metabolism of various compounds, including drugs. CYP enzymes are the major enzymes involved in drug metabolism. CYP1A1 is ...

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“…Hypoxia preconditioning is a cellular adaptive mechanism elicited by sublethal exposure of cells to low oxygen concentrations (Murry et al, 1986). The stress response that follows will protect cells against subsequent hypoxic insults, leading to improved function and survival through upregulation of antiapoptotic and pro-angiogenic factors in, for example, stem cellbased treatment of myocardial infarction (Azarnoush et al, 2005;Hu et al, 2008), ischaemic disease in limb and brain (Bhang et al, 2011;Rey et al, 2011;Theus et al, 2008) or spinal cord injury (Oh et al, 2010).…”

Section: Modulating Hypoxia Signalling Pathways As a Cellular Protectmentioning

confidence: 99%

Targeting the hypoxic response in bone tissue engineering: A balance between supply and consumption to improve bone regeneration

Stiers

Gastel

Carmeliet

2016

Molecular and Cellular Endocrinology

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a b s t r a c tBone tissue engineering is a promising therapeutic alternative for bone grafting of large skeletal defects. It generally comprises an ex vivo engineered combination of a carrier structure, stem/progenitor cells and growth factors. However, the success of these regenerative implants largely depends on how well implanted cells will adapt to the hostile and hypoxic host environment they encounter after implantation. In this review, we will discuss how hypoxia signalling may be used to improve bone regeneration in a tissue-engineered construct. First, hypoxia signalling induces angiogenesis which increases the survival of the implanted cells as well as stimulates bone formation. Second, hypoxia signalling has also angiogenesis-independent effects on mesenchymal cells in vitro, offering exciting new possibilities to improve tissue-engineered bone regeneration in vivo. In addition, studies in other fields have shown that benefits of modulating hypoxia signalling include enhanced cell survival, proliferation and differentiation, culminating in a more potent regenerative implant. Finally, the stimulation of endochondral bone formation as a physiological pathway to circumvent the harmful effects of hypoxia will be briefly touched upon. Thus, angiogenic dependent and independent processes may counteract the deleterious hypoxic effects and we will discuss several therapeutic strategies that may be combined to withstand the hypoxia upon implantation and improve bone regeneration.

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Angiogenesis in ischemic tissue produced by spheroid grafting of human adipose-derived stromal cells

Cited by 328 publications

References 47 publications

Physiologically Low Oxygen Enhances Biomolecule Production and Stemness of Mesenchymal Stem Cell Spheroids

Physiologically Low Oxygen Enhances Biomolecule Production and Stemness of Mesenchymal Stem Cell Spheroids

Optimization of Albumin Secretion and Metabolic Activity of Cytochrome P450 1A1 of Human Hepatoblastoma HepG2 Cells in Multicellular Spheroids by Controlling Spheroid Size

Targeting the hypoxic response in bone tissue engineering: A balance between supply and consumption to improve bone regeneration

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