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Xu Y, Fu M, Li Z, Fan Z, Li X, Liu Y, Anderson PM, Xie X, Liu Z, Guan J. A prosurvival and proangiogenic stem cell delivery system to promote ischemic limb regeneration. Acta Biomater 2016; 31:99-113. [PMID: 26689466 DOI: 10.1016/j.actbio.2015.12.021] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Revised: 11/17/2015] [Accepted: 12/11/2015] [Indexed: 12/20/2022]
Abstract
Stem cell therapy is one of the most promising strategies to restore blood perfusion and promote muscle regeneration in ischemic limbs. Yet its therapeutic efficacy remains low owing to the inferior cell survival under the low oxygen and nutrient environment of the injured limbs. To increase therapeutic efficacy, high rates of both short- and long-term cell survival are essential, which current approaches do not support. In this work, we hypothesized that a high rate of short-term cell survival can be achieved by introducing a prosurvival environment into the stem cell delivery system to enhance cell survival before vascularization is established; and that a high rate of long-term cell survival can be attained by building a proangiogenic environment in the system to quickly vascularize the limbs. The system was based on a biodegradable and thermosensitive poly(N-Isopropylacrylamide)-based hydrogel, a prosurvival and proangiogenic growth factor bFGF, and bone marrow-derived mesenchymal stem cells (MSCs). bFGF can be continuously released from the system for 4weeks. The released bFGF significantly improved MSC survival and paracrine effects under low nutrient and oxygen conditions (0% FBS and 1% O2) in vitro. The prosurvival effect of the bFGF on MSCs was resulted from activating cell Kruppel-like factor 4 (KLF4) pathway. When transplanted into the ischemic limbs, the system dramatically improved MSC survival. Some of the engrafted cells were differentiated into skeletal muscle and endothelial cells, respectively. The system also promoted the proliferation of host cells. After only 2weeks of implantation, tissue blood perfusion was completely recovered; and after 4weeks, the muscle fiber diameter was restored similarly to that of the normal limbs. These pronounced results demonstrate that the developed stem cell delivery system has a potential for ischemic limb regeneration. STATEMENT OF SIGNIFICANCE Stem cell therapy is a promising strategy to restore blood perfusion and promote muscle regeneration in ischemic limbs. Yet its therapeutic efficacy remains low owing to the inferior cell survival under the ischemic environment of the injured limbs. To increase therapeutic efficacy, high rate of cell survival is essential, which current approaches do not support. In this work, we tested the hypothesis that a stem cell delivery system that can continuously release a prosurvival and proangiogenic growth factor will promote high rates of cell survival in the ischemic limbs. The prosurvival effect could augment cell survival before vascularization is established, while the proangiogenic effect could stimulate quick angiogenesis to achieve long-term cell survival. Meanwhile, the differentiation of stem cells into endothelial and myogenic lineages, and cell paracrine effects will enhance vascularization and muscle regeneration.
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Affiliation(s)
- Yanyi Xu
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, United States
| | - Minghuan Fu
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, United States; Department of Gerontology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, China
| | - Zhihong Li
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, United States; Division of General Surgery, Shanghai Pudong New District Zhoupu Hospital, Shanghai 201200, China
| | - Zhaobo Fan
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, United States
| | - Xiaofei Li
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, United States
| | - Ying Liu
- Department of Gerontology, Tongji Hospital, Tongji University, Shanghai, China
| | - Peter M Anderson
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, United States
| | - Xiaoyun Xie
- Department of Gerontology, Tongji Hospital, Tongji University, Shanghai, China
| | - Zhenguo Liu
- Davis Heart and Lung Research Institute, The Ohio State University, OH 43210, United States
| | - Jianjun Guan
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, United States; Tongji Hospital, Tongji University, Shanghai, China.
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Evaluation of the clinical relevance and limitations of current pre-clinical models of peripheral artery disease. Clin Sci (Lond) 2015; 130:127-50. [DOI: 10.1042/cs20150435] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Peripheral artery disease (PAD) has recognized treatment deficiencies requiring the discovery of novel interventions. This article describes current animal models of PAD and discusses their advantages and disadvantages. There is a need for models which more directly simulate the characteristics of human PAD, such as acute-on-chronic presentation, presence of established risk factors and impairment of physical activity.
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Xu Y, Li Z, Li X, Fan Z, Liu Z, Xie X, Guan J. Regulating myogenic differentiation of mesenchymal stem cells using thermosensitive hydrogels. Acta Biomater 2015; 26:23-33. [PMID: 26277379 DOI: 10.1016/j.actbio.2015.08.010] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 07/30/2015] [Accepted: 08/11/2015] [Indexed: 01/02/2023]
Abstract
Stem cell therapy has potential to regenerate skeletal muscle tissue in ischemic limb. However, the delivered stem cells experience low rate of myogenic differentiation. Employing injectable hydrogels as stem cell carriers may enhance the myogenic differentiation as their modulus may be tailored to induce the differentiation. Yet current approaches used to manipulate hydrogel modulus often simultaneously vary other properties that also affect stem cell differentiation, such as chemical structure, composition and water content. Thus it is challenging to demonstrate the decoupled effect of hydrogel modulus on stem cell differentiation. In this report, we decoupled the hydrogel modulus from chemical structure, composition, and water content using injectable and thermosensitive hydrogels. The hydrogels were synthesized from N-isopropylacrylamide (NIPAAm), acrylic acid (AAc), and degradable macromer 2-hydroxyethyl methacrylate-oligomer [oligolatide, oligohydroxybutyrate, or oligo(trimethylene carbonate)]. We found that using the same monomer composition and oligomer chemical structure but different oligomer length can independently vary hydrogel modulus. Rat bone marrow mesenchymal stem cells (MSCs) were encapsulated in the hydrogels with elastic expansion moduli of 11, 20, and 40 kPa, respectively. After 14 days of culture, significant myogenic differentiation was achieved for the hydrogel with elastic expansion modulus of 20 kPa, as judged from both the gene and protein expression. In addition, MSCs exhibited an elastic expansion modulus-dependent proliferation rate. The most significant proliferation was observed in the hydrogel with elastic expansion modulus of 40 kPa. These results demonstrate that the developed injectable and thermosensitive hydrogels with suitable modulus has the potential to deliver stem cells into ischemic limb for enhanced myogenic differentiation and muscle regeneration. STATEMENT OF SIGNIFICANCE Stem cell therapy for skeletal muscle regeneration in ischemic limb experiences low rate of myogenic differentiation. Employing injectable hydrogels as stem cell carriers may enhance the myogenic differentiation as hydrogel modulus may be modulated to induce the differentiation. Yet current approaches used to modulate hydrogel modulus may simultaneously vary other properties that also affect stem cell myogenic differentiation, such as chemistry, composition and water content. In this report, we decoupled the hydrogel modulus from chemistry, composition, and water content using injectable and thermosensitive hydrogels. We found that mesenchymal stem cells best differentiated into myogenic lineage in the hydrogel with elastic modulus of 20 kPa.
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Affiliation(s)
- Yanyi Xu
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, United States
| | - Zhenqing Li
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, United States
| | - Xiaofei Li
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, United States
| | - Zhaobo Fan
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, United States
| | - Zhenguo Liu
- Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH 43210, United States
| | - Xiaoyun Xie
- Department of Gerontology, Tongji Hospital, Tongji University, Shanghai, China
| | - Jianjun Guan
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, United States; Tongji Hospital, Tongji University, Shanghai, China.
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Ledford KJ, Murphy N, Zeigler F, Bartel RL, Tubo R. Therapeutic potential of ixmyelocel-T, an expanded autologous multicellular therapy for treatment of ischemic cardiovascular diseases. Stem Cell Res Ther 2015; 6:25. [PMID: 25889271 PMCID: PMC4413547 DOI: 10.1186/s13287-015-0007-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 02/09/2015] [Accepted: 02/09/2015] [Indexed: 11/10/2022] Open
Abstract
INTRODUCTION Bone marrow derived cellular therapies are an emerging approach to promoting therapeutic angiogenesis in ischemic cardiovascular disease. However, the percentage of regenerative cells in bone marrow mononuclear cells (BMMNCs) is small, and large amounts of BMMNCs are required. Ixmyelocel-T, an expanded autologous multicellular therapy, is manufactured from a small sample of bone marrow aspirate. Ixmyelocel-T contains expanded populations of mesenchymal stromal cells (MSCs) and M2-like macrophages, as well as many of the CD45+ cells found in the bone marrow. It is hypothesized that this expanded multi-cellular therapy would induce angiogenesis and endothelial repair. METHODS A rat model of hind limb ischemia was used to determine the effects of ixmyelocel-T on blood flow recovery. To further determine the effects on endothelial cells, ixmyelocel-T was co-cultured with human umbilical vein endothelial cells (HUVEC) in non-contacting Transwell® inserts. RESULTS Co-culture of HUVECs with ixmyelocel-T resulted secretion of a variety of pro-angiogenic factors. HUVECs stimulated by ixmyelocel-T exhibited enhanced migration, proliferation, and branch formation. Ixmyelocel-T co-culture also resulted in increased endothelial nitric oxide synthase (eNOS) expression and nitric oxide (NO) production. In tumor necrosis factor alpha (TNFα)-stimulated HUVECs, ixmyelocel-T co-culture decreased apoptosis and reactive oxygen species generation, increased super oxide dismutase activity, and decreased nuclear factor kappa B (NFκB) activation. Treatment with ixmyelocel-T in a rat model of hind limb ischemia resulted in significantly increased blood flow perfusion and capillary density, gene expression and plasma levels of the anti-inflammatory cytokine interleukin (IL)-10, plasma nitrates, plasma platelet-derived growth factor (PDGF)-BB, vascular endothelial growth factor (VEGF) expression, and significantly decreased plasma thiobarbituric acid reactive substances (TBARS). CONCLUSIONS This work demonstrates that ixmyelocel-T interacts with endothelial cells in a paracrine manner, resulting in angiogenesis and endothelial protection. This data suggests that ixmyelocel-T could be useful for promoting of angiogenesis and tissue repair in ischemic cardiovascular diseases. In conclusion, ixmyelocel-T therapy may provide a new aspect of therapeutic angiogenesis in this patient population where expanded populations of regenerative cells might be required.
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Affiliation(s)
- Kelly J Ledford
- Aastrom Biosciences, Domino's Farms, Lobby K 24 Frank Lloyd Wright Drive, Ann Arbor, MI, 48105, USA.
| | - Nikki Murphy
- Aastrom Biosciences, Domino's Farms, Lobby K 24 Frank Lloyd Wright Drive, Ann Arbor, MI, 48105, USA.
| | - Frank Zeigler
- Aastrom Biosciences, Domino's Farms, Lobby K 24 Frank Lloyd Wright Drive, Ann Arbor, MI, 48105, USA.
| | - Ronnda L Bartel
- Aastrom Biosciences, Domino's Farms, Lobby K 24 Frank Lloyd Wright Drive, Ann Arbor, MI, 48105, USA.
| | - Ross Tubo
- Aastrom Biosciences, Domino's Farms, Lobby K 24 Frank Lloyd Wright Drive, Ann Arbor, MI, 48105, USA.
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Jung WS, Han SM, Kim SM, Kim ME, Lee JS, Seo KW, Youn HY, Lee HW. Stimulatory effect of HGF-overexpressing adipose tissue-derived mesenchymal stem cells on thymus regeneration in a rat thymus involution model. Cell Biol Int 2014; 38:1106-17. [DOI: 10.1002/cbin.10306] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 04/14/2014] [Indexed: 01/07/2023]
Affiliation(s)
- Woo-Sung Jung
- Department of Veterinary Internal Medicine, College of Veterinary Medicine; Seoul National University; 1 Gwanak-ro Gwanak-gu Seoul 151-742 Republic of Korea
| | - Sei-Myoung Han
- Department of Veterinary Internal Medicine, College of Veterinary Medicine; Seoul National University; 1 Gwanak-ro Gwanak-gu Seoul 151-742 Republic of Korea
| | - Sung-Min Kim
- Division of Magnetic Resonance Research; Korea Basic Science Institute; Ochang Chungbuk Republic of Korea
| | - Mi-Eun Kim
- Department of Biology, College of Natural Sciences; Chosun University; Gwangju Republic of Korea
| | - Jun-Sik Lee
- Department of Biology, College of Natural Sciences; Chosun University; Gwangju Republic of Korea
| | - Kyoung-Won Seo
- Department of Veterinary Internal Medicine, College of Veterinary Medicine; Chungnam National University; 99 Daehakro Yuseoung gu Daejon 305-764 Republic of Korea
| | - Hwa-Young Youn
- Department of Veterinary Internal Medicine, College of Veterinary Medicine; Seoul National University; 1 Gwanak-ro Gwanak-gu Seoul 151-742 Republic of Korea
- Research Institute for Veterinary Science, College of Veterinary Medicine; Seoul National University; 1 Gwanak-ro Gwanak-gu Seoul 151-742 Republic of Korea
| | - Hee-Woo Lee
- Research Institute for Veterinary Science, College of Veterinary Medicine; Seoul National University; 1 Gwanak-ro Gwanak-gu Seoul 151-742 Republic of Korea
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Abstract
There is worldwide demand for therapies to promote the robust repair and regeneration with maximum regain of function of particular tissues and organs damaged by disease or injury. The potential role of adult stem cells has been highlighted by an increasing number of in vitro and in vivo studies. Nowhere is this more evident than in adult stem cell-based therapies being explored to promote cardiac regeneration. In spite of encouraging advances, significant challenges remain.
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Affiliation(s)
- Kursad Turksen
- Regenerative Medicine Program, Sprott Centre for Stem Cell Research, Ottawa Hospital Research Institute, 501 Smyth Road, Ottawa, ON, K1H 8L6, Canada,
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Ledford KJ, Zeigler F, Bartel RL. Ixmyelocel-T, an expanded multicellular therapy, contains a unique population of M2-like macrophages. Stem Cell Res Ther 2013; 4:134. [PMID: 24405629 PMCID: PMC4029268 DOI: 10.1186/scrt345] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Accepted: 10/23/2013] [Indexed: 02/08/2023] Open
Abstract
INTRODUCTION M2 macrophages promote tissue repair and regeneration through various mechanisms including immunomodulation and scavenging of tissue debris. Delivering increased numbers of these cells to ischemic tissues may limit tissue injury and promote repair. Ixmyelocel-T is an expanded, autologous multicellular therapy cultured from bone-marrow mononuclear cells (BMMNCs). The purpose of this study was to characterize further a unique expanded population of M2-like macrophages, generated in ixmyelocel-T therapy. METHODS Approximately 50 ml of whole bone marrow was obtained from healthy donors and shipped overnight. BMMNCs were produced by using density-gradient separation and cultured for approximately 12 days to generate ixmyelocel-T. CD14+ cells were isolated from ixmyelocel-T with positive selection for analysis. Cell-surface phenotype was examined with flow cytometry and immunofluorescence, and expression of cytokines and chemokines was analyzed with enzyme-linked immunosorbent assay (ELISA). Quantitative real-time PCR was used to analyze expression of genes in BMMNCs, ixmyelocel-T, the CD14+ population from ixmyelocel-T, and M1 and M2 macrophages. Ixmyelocel-T was cultured with apoptotic BMMNCs, and then visualized under fluorescence microscopy to assess efferocytosis. RESULTS Macrophages in ixmyelocel-T therapy expressed surface markers of M2 macrophages, CD206, and CD163. These cells were also found to express several M2 markers, and few to no M1 markers. After stimulation with lipopolysaccharide (LPS), they showed minimal secretion of the proinflammatory cytokines interleukin-12 (IL-12) and tumor necrosis factor alpha (TNF-α) compared with M1 and M2 macrophages. Ixmyelocel-T macrophages efficiently ingested apoptotic BMMNCs. CONCLUSIONS Ixmyelocel-T therapy contains a unique population of M2-like macrophages that are characterized by expression of M2 markers, decreased secretion of proinflammatory cytokines after inflammatory stimuli, and efficient removal of apoptotic cells. This subpopulation of cells may have a potential role in tissue repair and regeneration.
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