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Choi J, Choi W, Joo Y, Chung H, Kim D, Oh SJ, Kim SH. FGF2-primed 3D spheroids producing IL-8 promote therapeutic angiogenesis in murine hindlimb ischemia. NPJ Regen Med 2021; 6:48. [PMID: 34408157 PMCID: PMC8373896 DOI: 10.1038/s41536-021-00159-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 07/29/2021] [Indexed: 02/07/2023] Open
Abstract
Peripheral artery disease is a progressive, devastating disease that leads to critical limb ischemia (CLI). Therapeutic angiogenesis using stem cell therapy has emerged as a promising approach for its treatment; however, adapting cell-based therapy has been limited by poor cell survival and low treatment efficiency. To overcome unmet clinical needs, we developed a fibroblast growth factor 2 (FGF2)-immobilized matrix that enabled control of cell adhesion to the surface and exerted a priming effect on the cell. Human adipose-derived stem cells (hASCs) grown in this matrix formed a functionally enhanced cells spheroid (FECS-Ad) that secreted various angiogenic factors including interleukin-8 (IL-8). We demonstrated that IL-8 was upregulated by the FGF2-mediated priming effect during FECS-Ad formation. Immobilized FGF2 substrate induced stronger IL-8 expression than soluble FGF2 ligands, presumably through the FGFR1/JNK/NF-κB signaling cascade. In IL-8-silenced FECS-Ad, vascular endothelial growth factor (VEGF) expression was decreased and angiogenic potential was reduced. Intramuscular injection of FECS-Ad promoted angiogenesis and muscle regeneration in mouse ischemic tissue, while IL-8 silencing in FECS-Ad inhibited these effects. Taken together, our data demonstrate that IL-8 contributes to therapeutic angiogenesis and suggest that FECS-Ad generated using the MBP-FGF2 matrix might provide a reliable platform for developing therapeutic agents to treat CLI.
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Affiliation(s)
- Jungkyun Choi
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
- Division of Bio-Medical Science and Technology, KIST School, Korea University of Science and Technology, Seoul, Republic of Korea
| | - Wooshik Choi
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
| | - Yunji Joo
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
- Division of Bio-Medical Science and Technology, KIST School, Korea University of Science and Technology, Seoul, Republic of Korea
| | - Haeun Chung
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
- Division of Bio-Medical Science and Technology, KIST School, Korea University of Science and Technology, Seoul, Republic of Korea
| | - Dokyun Kim
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
- Division of Bio-Medical Science and Technology, KIST School, Korea University of Science and Technology, Seoul, Republic of Korea
| | - Seung Ja Oh
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
| | - Sang-Heon Kim
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea.
- Division of Bio-Medical Science and Technology, KIST School, Korea University of Science and Technology, Seoul, Republic of Korea.
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Enriquez-Ochoa D, Robles-Ovalle P, Mayolo-Deloisa K, Brunck MEG. Immobilization of Growth Factors for Cell Therapy Manufacturing. Front Bioeng Biotechnol 2020; 8:620. [PMID: 32637403 PMCID: PMC7317031 DOI: 10.3389/fbioe.2020.00620] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 05/20/2020] [Indexed: 12/21/2022] Open
Abstract
Cell therapy products exhibit great therapeutic potential but come with a deterring price tag partly caused by their costly manufacturing processes. The development of strategies that lead to cost-effective cell production is key to expand the reach of cell therapies. Growth factors are critical culture media components required for the maintenance and differentiation of cells in culture and are widely employed in cell therapy manufacturing. However, they are expensive, and their common use in soluble form is often associated with decreased stability and bioactivity. Immobilization has emerged as a possible strategy to optimize growth factor use in cell culture. To date, several immobilization techniques have been reported for attaching growth factors onto a variety of biomaterials, but these have been focused on tissue engineering. This review briefly summarizes the current landscape of cell therapy manufacturing, before describing the types of chemistry that can be used to immobilize growth factors for cell culture. Emphasis is placed to identify strategies that could reduce growth factor usage and enhance bioactivity. Finally, we describe a case study for stem cell factor.
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Affiliation(s)
| | | | - Karla Mayolo-Deloisa
- Tecnologico de Monterrey, School of Engineering and Science, FEMSA Biotechnology Center, Monterrey, Mexico
| | - Marion E. G. Brunck
- Tecnologico de Monterrey, School of Engineering and Science, FEMSA Biotechnology Center, Monterrey, Mexico
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Kang JM, Rajangam T, Rhie JW, Kim SH. Characterization of cell signaling, morphology, and differentiation potential of human mesenchymal stem cells based on cell adhesion mechanism. J Cell Physiol 2020; 235:6915-6928. [PMID: 32017071 DOI: 10.1002/jcp.29587] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Accepted: 01/13/2020] [Indexed: 12/24/2022]
Abstract
It is essential to characterize the cellular properties of mesenchymal stem cell populations to maintain quality specifications and control in regenerative medicine. Biofunctional materials have been designed as artificial matrices for the stimulation of cell adhesion and specific cellular functions. We have developed recombinant maltose-binding protein (MBP)-fused proteins as artificial adhesion matrices to control human mesenchymal stem cell (hMSC) fate by using an integrin-independent heparin sulfate proteoglycans-mediated cell adhesion. In this study, we characterize cell adhesion-dependent cellular behaviors of human adipose-derived stem cells (hASCs) and human bone marrow stem cells (hBMSCs). We used an MBP-fused basic fibroblast growth factor (MF)-coated surface and fibronectin (FN)-coated surface to restrict and support, respectively, integrin-mediated adhesion. The cells adhered to MF exhibited restricted actin cytoskeleton organization and focal adhesion kinase phosphorylation. The hASCs and hBMSCs exhibited different cytoplasmic projection morphologies on MF. Both hASCs and hBMSCs differentiated more dominantly into osteogenic cells on FN than on MF. In contrast, hASCs differentiated more dominantly into adipogenic cells on MF than on FN, whereas hBMSCs differentiated predominantly into adipogenic cells on FN. The results indicate that hASCs exhibit a competitive differentiation potential (osteogenesis vs. adipogenesis) that depends on the cell adhesion matrix, whereas hBMSCs exhibit both adipogenesis and osteogenesis in integrin-mediated adhesion and thus hBMSCs have noncompetitive differentiation potential. We suggest that comparing differentiation behaviors of hMSCs with the diversity of cell adhesion is an important way to characterize hMSCs for regenerative medicine.
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Affiliation(s)
- Jung-Mi Kang
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul, South Korea.,Department of Biomedical Engineering, Korea University of Science and Technology, Daejeon, South Korea
| | - Thanavel Rajangam
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul, South Korea
| | - Jong-Won Rhie
- Department of Plastic Surgery, College of Medicine, Catholic University of Korea, Seoul, South Korea
| | - Sang-Heon Kim
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul, South Korea.,Department of Biomedical Engineering, Korea University of Science and Technology, Daejeon, South Korea
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Kang JM, Yoon JK, Oh SJ, Kim BS, Kim SH. Synergistic Therapeutic Effect of Three-Dimensional Stem Cell Clusters and Angiopoietin-1 on Promoting Vascular Regeneration in Ischemic Region. Tissue Eng Part A 2018; 24:616-630. [DOI: 10.1089/ten.tea.2017.0260] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Affiliation(s)
- Jung-Mi Kang
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
- Department of Biomedical Engineering, Korea University of Science and Technology, Daejeon, Republic of Korea
| | - Jeong-Kee Yoon
- School of Chemical and Biological Engineering, Seoul National University, Seoul, Republic of Korea
| | - Seong-ja Oh
- Department of Biomedical Engineering, Korea University of Science and Technology, Daejeon, Republic of Korea
| | - Byung-Soo Kim
- School of Chemical and Biological Engineering, Seoul National University, Seoul, Republic of Korea
- Bio-MAX Institute, Institute of Chemical Processes, Seoul National University, Seoul, Republic of Korea
| | - Sang-Heon Kim
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
- Department of Biomedical Engineering, Korea University of Science and Technology, Daejeon, Republic of Korea
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Kim JH, Park Y, Jung Y, Kim SH, Kim SH. Combinatorial therapy with three-dimensionally cultured adipose-derived stromal cells and self-assembling peptides to enhance angiogenesis and preserve cardiac function in infarcted hearts. J Tissue Eng Regen Med 2016; 11:2816-2827. [PMID: 27256923 DOI: 10.1002/term.2181] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 02/12/2016] [Accepted: 03/07/2016] [Indexed: 12/24/2022]
Abstract
Even though stem cell therapy is a promising angiogenic strategy to treat ischaemic diseases, including myocardial infarction (MI), therapeutic efficacy is limited by low survival and retention of transplanted cells in ischaemic tissues. In addition, therapeutic angiogenesis depends on stimulating host angiogenesis with paracrine factors released by transplanted cells rather than on direct blood vessel formation by transplanted cells. In the present study, to overcome these limitations and to enhance the therapeutic efficacy of MI treatment, combinatorial therapy with three-dimensional cell masses (3DCMs) and self-assembling peptides (SAPs) was tested in a rat MI model. Spheroid-type 3DCMs, which are vascular differentiation-induced cells, were prepared by culturing human adipose-derived stromal cells on a fibroblast growth factor-immobilized surface. The SAPs were used as the carrier material to increase engraftment of transplanted cells. After coronary artery ligation, 3DCMs were combined with SAPs and were transplanted into ischaemic lesions. The therapeutic potential was evaluated 4 weeks after treatment. By combining 3DCMs and SAPs, survival and retention of transplanted cells increased threefold when compared with treatment with 3DCMs alone and transplanted cells established vascular networks in infarcted hearts. In addition, the size of the infarct in the 3DCM + SAP group was reduced to 6.09 ± 2.83% by the promotion of host angiogenesis and cardiac function was preserved, as demonstrated by a 54.25 ± 4.42% increase in the ejection fraction. This study indicates that combinatorial therapy with 3DCM and SAPs could be a promising strategy for therapeutic angiogenesis to treat MI. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Ji Hyun Kim
- Centre for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea.,Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Yongdoo Park
- Korea Artificial Organ Centre, Korea University, Seoul, Republic of Korea.,Department of Biomedical Engineering, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Youngmee Jung
- Centre for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Soo Hyun Kim
- Centre for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Sang-Heon Kim
- Centre for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea.,Department of Biomedical Engineering, University of Science and Technology, Daejeon, Republic of Korea
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Nguyen MT, Krupa M, Koo BK, Song JA, Vu TTT, Do BH, Nguyen AN, Seo T, Yoo J, Jeong B, Jin J, Lee KJ, Oh HB, Choe H. Prokaryotic Soluble Overexpression and Purification of Human VEGF165 by Fusion to a Maltose Binding Protein Tag. PLoS One 2016; 11:e0156296. [PMID: 27231876 PMCID: PMC4883780 DOI: 10.1371/journal.pone.0156296] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 05/12/2016] [Indexed: 01/04/2023] Open
Abstract
Human vascular endothelial growth factor (VEGF) is a key regulator of angiogenesis and plays a central role in the process of tumor growth and metastatic dissemination. Escherichia coli is one of the most common expression systems used for the production of recombinant proteins; however, expression of human VEGF in E. coli has proven difficult because the E. coli-expressed VEGF tends to be misfolded and forms inclusion bodies, resulting in poor solubility. In this study, we successfully produced semi-preparative amounts of soluble bioactive human VEGF165 (hVEGF). We created seven N-terminal fusion tag constructs with hexahistidine (His6), thioredoxin (Trx), glutathione S-transferase (GST), maltose-binding protein (MBP), N-utilization substance protein A (NusA), human protein disulfide isomerase (PDI), and the b'a' domain of PDI (PDIb'a'), and tested each construct for soluble overexpression in E. coli. We found that at 18°C, 92.8% of the MBP-tagged hVEGF to be soluble and that this tag significantly increased the protein's solubility. We successfully purified 0.8 mg of pure hVEGF per 500 mL cell culture. The purified hVEGF is stable after tag cleavage, contains very low levels of endotoxin, and is 97.6% pure. Using an Flk1+ mesodermal precursor cell (MPC) differentiation assay, we show that the purified hVEGF is not only bioactive but has similar bioactivity to hVEGF produced in mammalian cells. Previous reports on producing hVEGF in E. coli have all been based on refolding of the protein from inclusion bodies. To our knowledge, this is the first report on successfully expressing and purifying soluble hVEGF in E. coli.
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Affiliation(s)
- Minh Tan Nguyen
- Department of Physiology and Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea
| | - Martin Krupa
- Department of Physiology and Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea
| | - Bon-Kyung Koo
- Department of Physiology and Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea
| | - Jung-A Song
- Department of Physiology and Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea
| | - Thu Trang Thi Vu
- Department of Physiology and Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea
| | - Bich Hang Do
- Department of Physiology and Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea
| | - Anh Ngoc Nguyen
- Department of Physiology and Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea
| | - Taewook Seo
- Department of Physiology and Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea
| | - Jiwon Yoo
- Department of Physiology and Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea
| | - Boram Jeong
- Department of Physiology and Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea
| | - Jonghwa Jin
- Osong Medical Innovation Foundation, New Drug Development Center, Division of Drug Screening and Evaluation, Chungbuk, 363–951, Korea
| | - Kyung Jin Lee
- Department of Convergence Medicine, Asan Institute for Life Sciences, University of Ulsan College of Medicine, Asan Medical Center, Seoul, 05505, Korea
| | - Heung-Bum Oh
- Department of Laboratory Medicine, University of Ulsan College of Medicine and Asan Medical Center, Seoul 05505, Korea
| | - Han Choe
- Department of Physiology and Bio-Medical Institute of Technology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea
- * E-mail:
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Park IS, Kang JA, Kang J, Rhie JW, Kim SH. Therapeutic Effect of Human Adipose-Derived Stromal Cells Cluster in Rat Hind-Limb Ischemia. Anat Rec (Hoboken) 2014; 297:2289-98. [DOI: 10.1002/ar.22961] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 02/20/2014] [Accepted: 02/21/2014] [Indexed: 11/10/2022]
Affiliation(s)
- In-Su Park
- Center for Biomaterials, Biomedical Research Institute; Korea Institute of Science and Technology; Seoul Korea
| | - Jo A. Kang
- Department of Plastic Surgery, College of Medicine; The Catholic University of Korea; Seoul Korea
| | - Jungmi Kang
- Center for Biomaterials, Biomedical Research Institute; Korea Institute of Science and Technology; Seoul Korea
- Department of Biomedical Engineering; University of Science and Technology; Seoul Korea
| | - Jong-Won Rhie
- Department of Plastic Surgery, College of Medicine; The Catholic University of Korea; Seoul Korea
| | - Sang-Heon Kim
- Center for Biomaterials, Biomedical Research Institute; Korea Institute of Science and Technology; Seoul Korea
- Department of Biomedical Engineering; University of Science and Technology; Seoul Korea
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Park IS, Rhie JW, Kim SH. A novel three-dimensional adipose-derived stem cell cluster for vascular regeneration in ischemic tissue. Cytotherapy 2013; 16:508-22. [PMID: 24210783 DOI: 10.1016/j.jcyt.2013.08.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 08/22/2013] [Accepted: 08/25/2013] [Indexed: 01/27/2023]
Abstract
BACKGROUND AIMS Stem cells are one of the most powerful tools in regeneration medicine. However, many limitations remain regarding the use of adult stem cells in clinical applications, including poor cell survival and low treatment efficiency. We describe an innovative three-dimensional cell mass (3DCM) culture that is based on cell adhesion (basic fibroblast growth factor-immobilized substrate) and assess the therapeutic potential of 3DCMs composed of human adipose tissue-derived stromal cells (hASCs). METHODS For formation of a 3DCM, hASCs were cultured on a substrate with immobilized fibroblast growth factor-2. The angiogenic potential of 3DCMs was determined by immunostaining, fluorescence-activated cell sorting and protein analysis. To evaluate the vasculature ability and improved treatment efficacy of 3DCMs, the 3DCMs were intramuscularly injected into the ischemic limbs of mice. RESULTS The 3DCMs released various angiogenic factors (eg, vascular endothelial growth factor and interleukin-8) and differentiated into vascular cells within 3 days in normal medium. Blood vessel and tissue regeneration was clearly observed through visual inspection in the 3DCM-injected group. hASC injection slowed limb necrosis after treatment, but 50% of the mice ultimately had limb loss within 28 days. Most mice receiving 3DCMs had limb salvage (89%) or mild limb necrosis (11%). CONCLUSIONS 3DCM culture promotes the efficient vascular differentiation of stem cells, and 3DCM transplantation results in the direct vascular regeneration of the injected cells and an improved therapeutic efficacy.
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Affiliation(s)
- In Su Park
- Center for Biomaterials, Biomedical Engineering Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Jong-Won Rhie
- Department of Plastic Surgery, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Sang-Heon Kim
- Center for Biomaterials, Biomedical Engineering Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea.
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Therapeutic angiogenesis of three-dimensionally cultured adipose-derived stem cells in rat infarcted hearts. Cytotherapy 2013; 15:542-56. [PMID: 23352461 DOI: 10.1016/j.jcyt.2012.11.016] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2012] [Revised: 11/07/2012] [Accepted: 11/30/2012] [Indexed: 12/12/2022]
Abstract
BACKGROUND AIMS To successfully treat myocardial infarction (MI), blood must be resupplied to the ischemic myocardium by inducing angiogenesis. Many studies report enhanced angiogenesis using stem cells; however, the therapeutic efficacy of cell transplant remains low because transplanted cells may not survive, be retained at the site of transplant, or develop into vascular tissue. In this study, we assessed the therapeutic potential of three-dimensional cell masses (3DCM) composed of human adipose-derived stem cells (hASC) in a rat MI model. METHODS For formation of 3DCM, hASC were cultured on a substrate with immobilized fibroblast growth factor 2. The morphology and phenotypes of 3DCM were analyzed 1 day after culture. The cells (hASC and 3DCM, 5 × 10(5) cells) were injected into ischemic regions after ligation of the left coronary artery (n = 6 in each group). Cell retention ratio, therapeutic efficacy and vascularization were evaluated 4 weeks after transplant. RESULTS A spheroid-type 3DCM, which included vascular cells (CD34(+)/CD31(+)/KDR(+)/α-SMA(+)) with high production of human vascular endothelial growth factor, was obtained. Infarct size and cardiomyocyte apoptosis were reduced in the 3DCM-injected group compared with the hASC-injected group. The retention ratio of hASC was 14-fold higher in the 3DCM-injected group. Many transplanted cells differentiated into endothelial and smooth muscle cells and formed vascular networks incorporated into host vessels. CONCLUSIONS Transplant of 3DCM may be useful for angiogenic cell therapy to treat MI.
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Abstract
We investigated whether transplantation of a three-dimensional cell mass of adipose-derived stem cells (3DCM-ASCs) improved hind limb functional recovery by the stimulation of angiogenesis and neurogenesis in a spinal cord injury. In in-vitro experiments, we confirmed that 3DCM-ASCs differentiated into CD31-positive endothelial cells. To evaluate the therapeutic effect of 3DCM-ASCs in vivo, PBS, human adipose tissue-derived stem cells, and 3DCM-ASCs were transplanted into a spinal cord injury model. The 3DCM-ASCs transplanted into the injured spinal cord differentiated into CD31-positive endothelial cells and remained differentiated. Transplantation of 3DCM-ASCs into the injured spinal cord significantly elevated the density of vascular formations through angiogenic factors released by the 3DCM-ASCs at the lesion site, and enhanced axonal outgrowth at the lesion site. Consistent with these results, the transplantation of 3DCM-ASCs significantly improved functional recovery compared with both ASC transplantation and PBS treatment. These findings suggest that transplantation of 3DCM-ASCs may be an effective stem cell therapy for the treatment of spinal cord injuries and neural ischemia.
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Kang JM, Han M, Park IS, Jung Y, Kim SH, Kim SH. Adhesion and differentiation of adipose-derived stem cells on a substrate with immobilized fibroblast growth factor. Acta Biomater 2012; 8:1759-67. [PMID: 22285427 DOI: 10.1016/j.actbio.2012.01.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Revised: 12/28/2011] [Accepted: 01/05/2012] [Indexed: 01/03/2023]
Abstract
Control of cell-matrix interactions plays a role in the regulation of stem cell function. In this study basic fibroblast growth factor (bFGF) linked to maltose-binding protein (MBP) was designed as a matrix for cell adhesion. MBP-FGF was immobilized on polystyrene (PS) surfaces by spontaneous adsorption. The amount of MBP-bFGF immobilized on the PS surface increased with increasing protein concentration, being 158 ng cm(-2) at 10 μg ml(-1) protein. Human adipose-derived stem cell (hASC) adhesion to MBP-bFGF immobilized on a PS surface (PS-MBP-bFGF) was inhibited by heparin. Integrin signaling and cell spreading of hASC on PS-MBP-bFGF were down-regulated compared with those on fibronectin-coated surfaces or tissue culture polystyrene (TCP). hASC differentiated into adipocytes, which stained positive for lipid vacuoles with Oil Red, more readily on PS-MBP-bFGF than on TCP. In contrast, hASC hardly differentiated into osteoblast on PS-MBP-bFGF or on TCP. These results suggest that the mechanism of hASC adhesion to MBP-bFGF immobilized on a PS substrate is mediated by a specific interaction between bFGF and heparin, and that the adhesion mechanism might provide an insight into the design of biomaterials to control the fate of stem cells.
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Single-step purification and immobilization of MBP-phytase fusion on starch agar beads: application in dephytination of soy milk. Appl Biochem Biotechnol 2012; 167:981-90. [PMID: 22371061 DOI: 10.1007/s12010-012-9598-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Accepted: 02/01/2012] [Indexed: 10/28/2022]
Abstract
Periplasmic phytase, appA from E. coli has been noticed as a superior feed and food additive owing to its high specific activity, acidic pH optimum and resistance to gastric proteases. E. coli phytase was expressed as a fusion protein with maltose-binding protein, affinity-purified to homogeneity and, subsequently, immobilized in one step using a cost-effective matrix prepared from starch agar bead. Immobilized enzyme revealed an activity optimum at pH 6, while that of free enzyme was observed at pH 4. Both the immobilized and free enzyme showed a temperature optimum at 60 °C. Cleavage of 87 kDa fusion protein using factor Xa released 45 kDa appA. Hydrolysis of soy milk using immobilized enzyme led to 10% increase in release of inorganic phosphate at 50 °C relative to free fusion protein. This study suggests the usability of MBP as an immobilizing linker to other food enzymes for economical use in industry.
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Edlund U, Sauter T, Albertsson AC. Covalent VEGF protein immobilization on resorbable polymeric surfaces. POLYM ADVAN TECHNOL 2010. [DOI: 10.1002/pat.1811] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Edlund U, Sauter T, Albertsson AC. Covalent VEGF protein immobilization on resorbable polymeric surfaces. POLYM ADVAN TECHNOL 2010. [DOI: 10.1002/pat.1772] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Park IS, Han M, Rhie JW, Kim SH, Jung Y, Kim IH, Kim SH. The correlation between human adipose-derived stem cells differentiation and cell adhesion mechanism. Biomaterials 2009; 30:6835-43. [PMID: 19781767 DOI: 10.1016/j.biomaterials.2009.08.057] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2009] [Accepted: 08/28/2009] [Indexed: 11/30/2022]
Abstract
In recent years, research in the areas of stem cells has dramatically increased, including studies of cellular adhesion to a substrate. We sought to determine the adhesive properties of human adipose-derived stem cells (hASCs) for extracellular matrix proteins. The adhesion of hASCs to collagens and laminin was completely inhibited by a monoclonal antibody, Mab 2253, which binds to the beta1 integrin subunit. These data indicate that hASC adhesion to collagens and laminin was exclusively mediated by an integrin. Cell adhesion on fibronectin (Fn) was inhibited by the heparin-binding peptide (HBP) in the presence of Mab 2253, but not by either Mab 2253 or HBP alone. These results indicate that both the beta1 subunit and the heparan sulfate proteoglycan participated in the cell adhesion to Fn. Microscopic views showed extensive spreading of hASCs cultured on Fn, whereas the cells maintained a round shape when cultured on a heparin-binding domain (HBD) substrate. hASCs differentiated into adipocytes, which stained positive for lipid vacuoles by Oil Red-O analysis, more readily on HBD substrate than on FN substrate. These results suggest that hASCs have an adhesion mechanism for the HBD of Fn and hASC morphology is controlled by the adhesion mechanism and strongly correlated with adipogenic differentiation.
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Affiliation(s)
- In-Su Park
- Biomaterial Research Center, Division of Life Sciences, Korea Institute of Science and Technology, 39-1 Hawolgok, Seongbuk, Seoul 136-791, Republic of Korea
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