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Dash BC, Duan K, Xing H, Kyriakides TR, Hsia HC. An in situ collagen-HA hydrogel system promotes survival and preserves the proangiogenic secretion of hiPSC-derived vascular smooth muscle cells. Biotechnol Bioeng 2020; 117:3912-3923. [PMID: 32770746 DOI: 10.1002/bit.27530] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 08/06/2020] [Accepted: 08/06/2020] [Indexed: 02/06/2023]
Abstract
Human-induced pluripotent stem cell-derived vascular smooth muscle cells (hiPSC-VSMCs) with proangiogenic properties have huge therapeutic potential. While hiPSC-VSMCs have already been utilized for wound healing using a biomimetic collagen scaffold, an in situ forming hydrogel mimicking the native environment of skin offers the promise of hiPSC-VSMC mediated repair and regeneration. Herein, the impact of a collagen type-I-hyaluronic acid (HA) in situ hydrogel cross-linked using a polyethylene glycol-based cross-linker on hiPSC-VSMCs viability and proangiogenic paracrine secretion was investigated. Our study demonstrated increases in cell viability, maintenance of phenotype and proangiogenic growth factor secretion, and proangiogenic activity in response to the conditioned medium. The optimally cross-linked and functionalized collagen type-I/HA hydrogel system developed in this study shows promise as an in situ hiPSC-VSMC carrier system for wound regeneration.
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Affiliation(s)
- Biraja C Dash
- Section of Plastic Surgery, Department of Surgery, Yale School of Medicine, Yale University, New Haven, Connecticut
| | - Kaiti Duan
- Section of Plastic Surgery, Department of Surgery, Yale School of Medicine, Yale University, New Haven, Connecticut
| | - Hao Xing
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut
| | - Themis R Kyriakides
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut.,Department of Pathology, Yale University, New Haven, Connecticut.,Vascular Biology and Therapeutics Program, Yale University, New Haven, Connecticut
| | - Henry C Hsia
- Section of Plastic Surgery, Department of Surgery, Yale School of Medicine, Yale University, New Haven, Connecticut.,Department of Biomedical Engineering, Yale University, New Haven, Connecticut
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52
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Abbasi AR, Sohail M, Minhas MU, Khaliq T, Kousar M, Khan S, Hussain Z, Munir A. Bioinspired sodium alginate based thermosensitive hydrogel membranes for accelerated wound healing. Int J Biol Macromol 2020; 155:751-765. [DOI: 10.1016/j.ijbiomac.2020.03.248] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 03/27/2020] [Accepted: 03/30/2020] [Indexed: 12/18/2022]
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MMP-9 responsive dipeptide-tempted natural protein hydrogel-based wound dressings for accelerated healing action of infected diabetic wound. Int J Biol Macromol 2020; 153:1058-1069. [DOI: 10.1016/j.ijbiomac.2019.10.236] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 10/25/2019] [Accepted: 10/25/2019] [Indexed: 01/08/2023]
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Chen S, Wang H, Su Y, John JV, McCarthy A, Wong SL, Xie J. Mesenchymal stem cell-laden, personalized 3D scaffolds with controlled structure and fiber alignment promote diabetic wound healing. Acta Biomater 2020; 108:153-167. [PMID: 32268240 PMCID: PMC7207021 DOI: 10.1016/j.actbio.2020.03.035] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 03/24/2020] [Accepted: 03/25/2020] [Indexed: 12/21/2022]
Abstract
The management of diabetic wounds remains a major therapeutic challenge in clinics. Herein, we report a personalized treatment using 3D scaffolds consisting of radially or vertically aligned nanofibers in combination with bone marrow mesenchymal stem cells (BMSCs). The 3D scaffolds have customizable sizes, depths, and shapes, enabling them to fit a variety of type 2 diabetic wounds. In addition, the 3D scaffolds are shape-recoverable in atmosphere and water following compression. The BMSCs-laden 3D scaffolds are capable of enhancing the formation of granulation tissue, promoting angiogenesis, and facilitating collagen deposition. Further, such scaffolds inhibit the formation of M1-type macrophages and the expression of pro-inflammatory cytokines IL-6 and TNF-α and promote the formation of M2-type macrophages and the expression of anti-inflammatory cytokines IL-4 and IL-10. Taken together, BMSCs-laden, 3D nanofiber scaffolds with controlled structure and alignment hold great promise for the treatment of diabetic wounds. STATEMENT OF SIGNIFICANCE: In this study, we developed 3D radially and vertically aligned nanofiber scaffolds to transplant bone marrow mesenchymal stem cells (BMSCs). We personalized 3D scaffolds that could completely match the size, depth, and shape of diabetic wounds. Moreover, both the radially and vertically aligned nanofiber scaffolds could completely recover their shape and maintain structural integrity after repeated loads with compressive stresses. Furthermore, the BMSCs-laden 3D scaffolds are able to promote granulation tissue formation, angiogenesis, and collagen deposition, and switch the immune responses to the pro-regenerative direction. These 3D scaffolds consisting of radially or vertically aligned nanofibers in combination with BMSCs offer a robust, customizable platform potentially for a significant improvement of managing diabetic wounds.
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Affiliation(s)
- Shixuan Chen
- Department of Surgery-Transplant and Mary and Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE 68198, United States
| | - Hongjun Wang
- Department of Surgery-Transplant and Mary and Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE 68198, United States
| | - Yajuan Su
- Department of Surgery-Transplant and Mary and Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE 68198, United States
| | - Johnson V John
- Department of Surgery-Transplant and Mary and Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE 68198, United States
| | - Alec McCarthy
- Department of Surgery-Transplant and Mary and Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE 68198, United States
| | - Shannon L Wong
- Department of Surgery-Plastic Surgery, University of Nebraska Medical Center, Omaha, NE 68198, United States
| | - Jingwei Xie
- Department of Surgery-Transplant and Mary and Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE 68198, United States.
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55
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Dash BC, Setia O, Gorecka J, Peyvandi H, Duan K, Lopes L, Nie J, Berthiaume F, Dardik A, Hsia HC. A Dense Fibrillar Collagen Scaffold Differentially Modulates Secretory Function of iPSC-Derived Vascular Smooth Muscle Cells to Promote Wound Healing. Cells 2020; 9:E966. [PMID: 32295218 PMCID: PMC7226960 DOI: 10.3390/cells9040966] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 04/06/2020] [Accepted: 04/11/2020] [Indexed: 12/20/2022] Open
Abstract
The application of human-induced pluripotent stem cells (hiPSCs) to generate vascular smooth muscle cells (hiPSC-VSMCs) in abundance is a promising strategy for vascular regeneration. While hiPSC-VSMCs have already been utilized for tissue-engineered vascular grafts and disease modeling, there is a lack of investigations exploring their therapeutic secretory factors. The objective of this manuscript was to understand how the biophysical property of a collagen-based scaffold dictates changes in the secretory function of hiPSC-VSMCs while developing hiPSC-VSMC-based therapy for durable regenerative wound healing. We investigated the effect of collagen fibrillar density (CFD) on hiPSC-VSMC's paracrine secretion and cytokines via the construction of varying density of collagen scaffolds. Our study demonstrated that CFD is a key scaffold property that modulates the secretory function of hiPSC-VSMCs. This study lays the foundation for developing collagen-based scaffold materials for the delivery of hiPSC-VSMCs to promote regenerative healing through guiding paracrine signaling pathways.
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Affiliation(s)
- Biraja C. Dash
- Section of Plastic Surgery, Department of Surgery Yale School of Medicine, Yale University, New Haven, CT 06510, USA; (H.P.); (K.D.); (J.N.)
| | - Ocean Setia
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, New Haven, CT 06510, USA; (O.S.); (J.G.); (L.L.); (A.D.)
| | - Jolanta Gorecka
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, New Haven, CT 06510, USA; (O.S.); (J.G.); (L.L.); (A.D.)
| | - Hassan Peyvandi
- Section of Plastic Surgery, Department of Surgery Yale School of Medicine, Yale University, New Haven, CT 06510, USA; (H.P.); (K.D.); (J.N.)
| | - Kaiti Duan
- Section of Plastic Surgery, Department of Surgery Yale School of Medicine, Yale University, New Haven, CT 06510, USA; (H.P.); (K.D.); (J.N.)
| | - Lara Lopes
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, New Haven, CT 06510, USA; (O.S.); (J.G.); (L.L.); (A.D.)
| | - James Nie
- Section of Plastic Surgery, Department of Surgery Yale School of Medicine, Yale University, New Haven, CT 06510, USA; (H.P.); (K.D.); (J.N.)
| | - Francois Berthiaume
- Department of Biomedical Engineering, Rutgers University, The State University New Jersey, Piscataway, NJ 08854, USA;
| | - Alan Dardik
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, New Haven, CT 06510, USA; (O.S.); (J.G.); (L.L.); (A.D.)
| | - Henry C. Hsia
- Section of Plastic Surgery, Department of Surgery Yale School of Medicine, Yale University, New Haven, CT 06510, USA; (H.P.); (K.D.); (J.N.)
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Gorecka J, Gao X, Fereydooni A, Dash BC, Luo J, Lee SR, Taniguchi R, Hsia HC, Qyang Y, Dardik A. Induced pluripotent stem cell-derived smooth muscle cells increase angiogenesis and accelerate diabetic wound healing. Regen Med 2020; 15:1277-1293. [PMID: 32228292 PMCID: PMC7304438 DOI: 10.2217/rme-2019-0086] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Aim: To assess the potential of human induced pluripotent stem cell-derived smooth muscle cells (hiPSC-SMC) to accelerate diabetic wound healing. Methods: hiPSC-SMC were embedded in 3D collagen scaffolds and cultured in vitro for 72 h; scaffolds were then applied to diabetic, nude mouse, splinted back wounds to assess in vivo healing. Cultured medium after scaffold incubation was collected and analyzed for expression of pro-angiogenic cytokines. Results: hiPSC-SMC secrete increased concentration of pro-angiogenic cytokines, compared with murine adipose derived stem cells. Delivery of hiPSC-SMC-containing collagen scaffolds accelerates diabetic wound healing and is associated with an increased number of total and M2 type macrophages. Conclusion: hiPSC-SMC promote angiogenesis and accelerate diabetic wound healing, making them a promising new candidate for treatment of diabetic wounds.
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Affiliation(s)
- Jolanta Gorecka
- Vascular Biology & Therapeutics Program & The Department of Surgery, Yale School of Medicine, Yale University, New Haven, CT 06519 USA
| | - Xixiang Gao
- Vascular Biology & Therapeutics Program & The Department of Surgery, Yale School of Medicine, Yale University, New Haven, CT 06519 USA.,Department of Vascular Surgery, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Arash Fereydooni
- Vascular Biology & Therapeutics Program & The Department of Surgery, Yale School of Medicine, Yale University, New Haven, CT 06519 USA
| | - Biraja C Dash
- Section of Plastic Surgery, Department of Surgery, Yale School of Medicine, Yale University, New Haven, CT 06520, USA
| | - Jiesi Luo
- Section of Cardiovascular Medicine, Department of Internal Medicine, Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511, USA.,Yale Stem Cell Center, Yale University, New Haven, CT 06520, USA.,Vascular Biology & Therapeutics Program, Yale School of Medicine, New Haven, CT 06519 USA.,Department of Pathology, YaleUniversity, New Haven, CT 06520, USA
| | - Shin Rong Lee
- Vascular Biology & Therapeutics Program & The Department of Surgery, Yale School of Medicine, Yale University, New Haven, CT 06519 USA
| | - Ryosuke Taniguchi
- Vascular Biology & Therapeutics Program & The Department of Surgery, Yale School of Medicine, Yale University, New Haven, CT 06519 USA
| | - Henry C Hsia
- Section of Plastic Surgery, Department of Surgery, Yale School of Medicine, Yale University, New Haven, CT 06520, USA
| | - Yibing Qyang
- Section of Cardiovascular Medicine, Department of Internal Medicine, Yale Cardiovascular Research Center, Yale School of Medicine, New Haven, CT 06511, USA.,Yale Stem Cell Center, Yale University, New Haven, CT 06520, USA.,Vascular Biology & Therapeutics Program, Yale School of Medicine, New Haven, CT 06519 USA.,Department of Pathology, YaleUniversity, New Haven, CT 06520, USA
| | - Alan Dardik
- Vascular Biology & Therapeutics Program & The Department of Surgery, Yale School of Medicine, Yale University, New Haven, CT 06519 USA.,Section of Vascular & Endovascular Surgery, VA Connecticut Healthcare System, West Haven, CT 06516, USA
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58
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Shahi M, Mohammadnejad D, Karimipour M, Rasta SH, Rahbarghazi R, Abedelahi A. Hyaluronic Acid and Regenerative Medicine: New Insights into the Stroke Therapy. Curr Mol Med 2020; 20:675-691. [PMID: 32213158 DOI: 10.2174/1566524020666200326095837] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Revised: 03/02/2020] [Accepted: 03/03/2020] [Indexed: 11/22/2022]
Abstract
Stroke is known as one of the very important public health problems that are related to societal burden and tremendous economic losses. It has been shown that there are few therapeutic approaches for the treatment of this disease. In this regard, the present therapeutic platforms aim to obtain neuroprotection, reperfusion, and neuro recovery. Among these therapies, regenerative medicine-based therapies have appeared as new ways of stroke therapy. Hyaluronic acid (HA) is a new candidate, which could be applied as a regenerative medicine-based therapy in the treatment of stroke. HA is a glycosaminoglycan composed of disaccharide repeating elements (N-acetyl-Dglucosamine and D-glucuronic acid). Multiple lines of evidence demonstrated that HA has critical roles in normal tissues. It can be a key player in different physiological and pathophysiological conditions such as water homeostasis, multiple drug resistance, inflammatory processes, tumorigenesis, angiogenesis, and changed viscoelasticity of the extracellular matrix. HA has very important physicochemical properties i.e., availability of reactive functional groups and its solubility, which make it a biocompatible material for application in regenerative medicine. Given that HAbased bioscaffolds and biomaterials do not induce inflammation or allergies and are hydrophilic, they are used as soft tissue fillers and injectable dermal fillers. Several studies indicated that HA could be employed as a new therapeutic candidate in the treatment of stroke. These studies documented that HA and HA-based therapies exert their pharmacological effects via affecting stroke-related processes. Herein, we summarized the role of the extracellular matrix in stroke pathogenesis. Moreover, we highlighted the HA-based therapies for the treatment of stroke.
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Affiliation(s)
- Maryam Shahi
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Daruosh Mohammadnejad
- Department of Anatomical Sciences, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Karimipour
- Department of Anatomical Sciences, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Seyed Hossein Rasta
- Department of Medical Bioengineering, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Reza Rahbarghazi
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Ali Abedelahi
- Department of Anatomical Sciences, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
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59
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Cho H, Macklin BL, Lin YY, Zhou L, Lai MJ, Lee G, Gerecht S, Duh EJ. iPSC-derived endothelial cell response to hypoxia via SDF1a/CXCR4 axis facilitates incorporation to revascularize ischemic retina. JCI Insight 2020; 5:131828. [PMID: 32213707 DOI: 10.1172/jci.insight.131828] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 02/20/2020] [Indexed: 12/15/2022] Open
Abstract
Ischemic retinopathies are major causes of blindness worldwide. Local hypoxia created by loss of vascular supply leads to tissue injury and aberrant neovascularization in the retina. There is a great need for therapies that enhance revascularization of hypoxic neuroretinal tissue. To test the therapeutic feasibility of human-induced pluripotent stem cell-derived endothelial cells (hiPSC-ECs) for the treatment of ischemic retinopathies, we compared the angiogenic potential of hiPSC-ECs with mature human retinal endothelial cells (HRECs) in response to hypoxia. hiPSC-ECs formed more robust and complex vascular networks in collagen gels, whereas HRECs displayed minimal sprouting. The cells were further tested in the mouse oxygen-induced retinopathy (OIR) model. Retinas with hiPSC-EC injection showed colocalization with host vessels, whereas HRECs lacked such responses. hiPSC-ECs markedly reduced vaso-obliteration and pathological neovascularization. This beneficial effect of hiPSC-ECs was explained by the stromal cell-derived factor-1a (SDF1a)/CXCR4 axis; hiPSC-ECs exhibited much higher cell-surface expression of CXCR4 than HRECs and greater chemotaxis toward SDF1a-embedded 3D collagen hydrogel. Furthermore, treatment with neutralizing antibody to CXCR4 abolished recruitment of hiPSCs in the OIR model. These findings suggest superior angiogenic potential of hiPSC-ECs under hypoxia and underscore the importance of SDF1a/CXCR4 in the reparative function of hiPSC-ECs in ischemic diseases.
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Affiliation(s)
- Hongkwan Cho
- Department of Ophthalmology, School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Bria L Macklin
- Department of Chemical and Biomolecular Engineering, Institute for NanoBioTechnology, Johns Hopkins University Baltimore, Maryland, USA
| | - Ying-Yu Lin
- Department of Chemical and Biomolecular Engineering, Institute for NanoBioTechnology, Johns Hopkins University Baltimore, Maryland, USA
| | - Lingli Zhou
- Department of Ophthalmology, School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Michael J Lai
- Department of Ophthalmology, School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Grace Lee
- Department of Ophthalmology, School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Sharon Gerecht
- Department of Chemical and Biomolecular Engineering, Institute for NanoBioTechnology, Johns Hopkins University Baltimore, Maryland, USA
| | - Elia J Duh
- Department of Ophthalmology, School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
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60
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Xu Z, Han S, Gu Z, Wu J. Advances and Impact of Antioxidant Hydrogel in Chronic Wound Healing. Adv Healthc Mater 2020; 9:e1901502. [PMID: 31977162 DOI: 10.1002/adhm.201901502] [Citation(s) in RCA: 318] [Impact Index Per Article: 79.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 12/15/2019] [Indexed: 01/20/2023]
Abstract
The accelerating and thorough treatment of chronic wounds still represents a major unmet medical need owing to the complex symptoms resulting from metabolic disorder of the wound microenvironment. Although numerous strategies and bioactive hydrogels are developed, an effective and widely used method of chronic wound treatment remains a bottleneck. With the aim to accelerate chronic wound healing, many hydrogel dressings with antioxidant functions have emerged and are proven to accelerate wound healing, especially for chronic wound repair. The new strategy in chronic wound treatment brought by antioxidant hydrogels is of great significance to human health. Here, the application of antioxidant hydrogels in the repair of chronic wounds is discussed systematically, aiming to provide an important theoretical reference for the further breakthrough of chronic wound healing.
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Affiliation(s)
- Zejun Xu
- Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong ProvinceSchool of Biomedical EngineeringSun Yat‐sen University Guangzhou 510006 P. R. China
| | - Shuyan Han
- Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong ProvinceSchool of Biomedical EngineeringSun Yat‐sen University Guangzhou 510006 P. R. China
| | - Zhipeng Gu
- College of Polymer Science and EngineeringState Key Laboratory of Polymer Materials EngineeringSichuan University Chengdu 610065 P. R. China
- Research Institute of Sun Yat‐sen University in Shenzhen Shenzhen 518057 P. R. China
| | - Jun Wu
- Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong ProvinceSchool of Biomedical EngineeringSun Yat‐sen University Guangzhou 510006 P. R. China
- Research Institute of Sun Yat‐sen University in Shenzhen Shenzhen 518057 P. R. China
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61
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Zhang D, Cai G, Mukherjee S, Sun Y, Wang C, Mai B, Liu K, Yang C, Chen Y. Elastic, Persistently Moisture-Retentive, and Wearable Biomimetic Film Inspired by Fetal Scarless Repair for Promoting Skin Wound Healing. ACS APPLIED MATERIALS & INTERFACES 2020; 12:5542-5556. [PMID: 31939277 DOI: 10.1021/acsami.9b20185] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
An efficient and available material for promoting skin regeneration is of great importance for public health, but it remains an elusive goal. Inspired by fetal scarless wound healing, we develop a wearable biomimetic film (WBMF) composed of hyaluronan (HA), vitamin E (VE), dopamine (DA), and β-cyclodextrin (β-CD) that mimics the fetal context (FC) and fetal extracellular matrix (ECM) around the wound bed for dermal regeneration. First, the WBMF creates the FC of sterility, hypoxia, persistent moisture, and no secondary insults for wounds as the result of its seamless adhesion to the skin, optimum stress-stretch and high-cycle fatigue resistance matching the anisotropic tension of the skin, and water-triggered self-healing behavior. Thus, the WBMF modulates the early wound situation to minimize inflammatory response. In the meantime, the WBMF mimics the critical biological function of fetal ECM, inducing fibroblast migration, suppressing the overexpression of transforming growth factor β1, and mediating collagen synthesis, distribution, and reestablishment. As a result, the WBMF accelerates wound healing and gains a normal dermal collagen architecture, thereby restoring scarless appearance. Overall, the WBMF provides a new paradigm for promoting skin wound healing and may find broad utility for the field of regenerative medicine.
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Affiliation(s)
- Dongmei Zhang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering , Jiangnan University , Wuxi 214122 , China
| | - Guanke Cai
- Department of Medical Image , Shaanxi Provincial Hospital of Traditional Chinese Medicine , Xi'an 710003 , China
| | - Somnath Mukherjee
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710119 , China
| | - Yajuan Sun
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering , Jiangnan University , Wuxi 214122 , China
| | - Changhao Wang
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710119 , China
| | - Bingjie Mai
- College of Life Sciences , Shaanxi Normal University , Xi'an 710119 , China
| | - Kaiqiang Liu
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710119 , China
| | - Cheng Yang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering , Jiangnan University , Wuxi 214122 , China
| | - Yashao Chen
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710119 , China
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Vorwald CE, Joshee S, Leach JK. Spatial localization of endothelial cells in heterotypic spheroids influences Notch signaling. J Mol Med (Berl) 2020; 98:425-435. [PMID: 32020237 DOI: 10.1007/s00109-020-01883-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 01/20/2020] [Accepted: 01/23/2020] [Indexed: 12/18/2022]
Abstract
Cell-based therapeutic approaches are an exciting strategy to replenish compromised endothelial cell (EC) populations that contribute to impaired vasculogenesis. Co-cultures of ECs and mesenchymal stromal cells (MSCs) can enhance neovascularization over ECs alone, but the efficacy of cells is limited by rapid cell death upon implantation. Co-culture spheroids exhibit improved survival compared with monodisperse cells, yet little is known about the influence of spatial regulation of ECs within co-culture spheroids. We hypothesized that EC sprouting from co-culture spheroids is a function of EC spatial localization. We formed co-culture spheroids containing ECs and MSCs in two formats: ECs uniformly distributed throughout the spheroid (i.e., mixed) or seeded on the perimeter of the MSC core (i.e., shell). Qualitative observations suggested increased vasculogenesis for mixed co-culture spheroids compared with shell conformations as early as day 3, yet quantitative metrics did not reveal significant differences in network formation between these 3D structures. Notch3 expression demonstrated significant increases in cell-cell communication in mixed conformations compared with shell counterparts. Furthermore, knockdown of Notch3 in MSCs abrogated the vasculogenic potential of mixed spheroids, supporting its role in promoting EC-MSC contacts. This study highlights the direct impact of EC-MSC contacts on sprouting and provides insight to improve the quality of network formation. KEY MESSAGES: • Endothelial cell (EC) localization can be controlled in co-culture EC-MSC spheroids. • Mixed spheroids exhibit consistent networks compared to shell counterparts. • Differences in NOTCH3 were observed between mixed and shell spheroids. • NOTCH3 may be a necessary target for improved vasculogenic potential.
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Affiliation(s)
- Charlotte E Vorwald
- Department of Biomedical Engineering, University of California, Davis, 451 Health Sciences Drive, Davis, CA, 95616, USA
| | - Shreeya Joshee
- Department of Biomedical Engineering, University of California, Davis, 451 Health Sciences Drive, Davis, CA, 95616, USA
| | - J Kent Leach
- Department of Biomedical Engineering, University of California, Davis, 451 Health Sciences Drive, Davis, CA, 95616, USA. .,Department of Orthopaedic Surgery, UC Davis Health, Sacramento, CA, 95817, USA.
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63
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Smith Q, Macklin B, Chan XY, Jones H, Trempel M, Yoder MC, Gerecht S. Differential HDAC6 Activity Modulates Ciliogenesis and Subsequent Mechanosensing of Endothelial Cells Derived from Pluripotent Stem Cells. Cell Rep 2020; 24:895-908.e6. [PMID: 30044986 DOI: 10.1016/j.celrep.2018.06.083] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 04/30/2018] [Accepted: 06/20/2018] [Indexed: 01/10/2023] Open
Abstract
The role of primary cilia in mechanosensation is essential in endothelial cell (EC) shear responsiveness. Here, we find that venous, capillary, and progenitor ECs respond to shear stress in vitro in a cilia-dependent manner. We then demonstrate that primary cilia assembly in human induced pluripotent stem cell (hiPSC)-derived ECs varies between different cell lines with marginal influence of differentiation protocol. hiPSC-derived ECs lacking cilia do not align to shear stress, lack stress fiber assembly, have uncoordinated migration during wound closure in vitro, and have aberrant calcium influx upon shear exposure. Transcriptional analysis reveals variation in regulatory genes involved in ciliogenesis among different hiPSC-derived ECs. Moreover, inhibition of histone deacetylase 6 (HDAC6) activity in hiPSC-ECs lacking cilia rescues cilia formation and restores mechanical sensing. Taken together, these results show the importance of primary cilia in hiPSC-EC mechano-responsiveness and its modulation through HDAC6 activity varies among hiPSC-ECs.
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Affiliation(s)
- Quinton Smith
- Department of Chemical and Biomolecular Engineering, Physical Sciences-Oncology Center and the Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Bria Macklin
- Department of Chemical and Biomolecular Engineering, Physical Sciences-Oncology Center and the Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Xin Yi Chan
- Department of Chemical and Biomolecular Engineering, Physical Sciences-Oncology Center and the Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Hannah Jones
- Department of Chemical and Biomolecular Engineering, Physical Sciences-Oncology Center and the Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Michelle Trempel
- Department of Chemical and Biomolecular Engineering, Physical Sciences-Oncology Center and the Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Mervin C Yoder
- Department of Pediatrics, Biochemistry, and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Sharon Gerecht
- Department of Chemical and Biomolecular Engineering, Physical Sciences-Oncology Center and the Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA; Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
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64
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Wang M, Wang C, Chen M, Xi Y, Cheng W, Mao C, Xu T, Zhang X, Lin C, Gao W, Guo Y, Lei B. Efficient Angiogenesis-Based Diabetic Wound Healing/Skin Reconstruction through Bioactive Antibacterial Adhesive Ultraviolet Shielding Nanodressing with Exosome Release. ACS NANO 2019; 13:10279-10293. [PMID: 31483606 DOI: 10.1021/acsnano.9b03656] [Citation(s) in RCA: 305] [Impact Index Per Article: 61.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Diabetic wound healing and angiogenesis remain a worldwide challenge for both clinic and research. The use of adipose stromal cell derived exosomes delivered by bioactive dressing provides a potential strategy for repairing diabetic wounds with less scar formation and fast healing. In this study, we fabricated an injectable adhesive thermosensitive multifunctional polysaccharide-based dressing (FEP) with sustained pH-responsive exosome release for promoting angiogenesis and diabetic wound healing. The FEP dressing possessed multifunctional properties including efficient antibacterial activity/multidrug-resistant bacteria, fast hemostatic ability, self-healing behavior, and tissue-adhesive and good UV-shielding performance. FEP@exosomes (FEP@exo) can significantly enhance the proliferation, migration, and tube formation of endothelial cells in vitro. In vivo results from a diabetic full-thickness cutaneous wound model showed that FEP@exo dressing accelerated the wound healing by stimulating the angiogenesis process of the wound tissue. The enhanced cell proliferation, granulation tissue formation, collagen deposition, remodeling, and re-epithelialization probably lead to the fast healing with less scar tissue formation and skin appendage regeneration. This study showed that combining bioactive molecules into multifunctional dressing should have great potential in achieving satisfactory healing in diabetic and other vascular-impaired related wounds.
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Affiliation(s)
- Min Wang
- Frontier Institute of Science and Technology, Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology , Xi'an Jiaotong University , Xi'an 710000 , China
| | - Chenggui Wang
- Key Laboratory of Orthopedics of Zhejiang Province , Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University , Wenzhou 325027 , China
- Department of Orthopedics Surgery , Second Affiliated Hospital, School of Medicine, Zhejiang University , Hangzhou 310009 , China
| | - Mi Chen
- Frontier Institute of Science and Technology, Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology , Xi'an Jiaotong University , Xi'an 710000 , China
| | - Yuewei Xi
- Frontier Institute of Science and Technology, Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology , Xi'an Jiaotong University , Xi'an 710000 , China
| | - Wei Cheng
- Frontier Institute of Science and Technology, Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology , Xi'an Jiaotong University , Xi'an 710000 , China
| | - Cong Mao
- Key Laboratory of Orthopedics of Zhejiang Province , Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University , Wenzhou 325027 , China
| | - Tianzhen Xu
- Key Laboratory of Orthopedics of Zhejiang Province , Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University , Wenzhou 325027 , China
| | - Xingxing Zhang
- Department of Burn , First Affiliated Hospital of Wenzhou Medical University , Wenzhou 325000 , China
| | - Cai Lin
- Department of Burn , First Affiliated Hospital of Wenzhou Medical University , Wenzhou 325000 , China
| | - Weiyang Gao
- Key Laboratory of Orthopedics of Zhejiang Province , Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University , Wenzhou 325027 , China
| | - Yi Guo
- Department of Biologic and Materials Science , University of Michigan , Ann Arbor , Michigan 48109 , United States
| | - Bo Lei
- Frontier Institute of Science and Technology, Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology , Xi'an Jiaotong University , Xi'an 710000 , China
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Chouhan D, Dey N, Bhardwaj N, Mandal BB. Emerging and innovative approaches for wound healing and skin regeneration: Current status and advances. Biomaterials 2019; 216:119267. [DOI: 10.1016/j.biomaterials.2019.119267] [Citation(s) in RCA: 161] [Impact Index Per Article: 32.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Revised: 05/25/2019] [Accepted: 06/08/2019] [Indexed: 12/17/2022]
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66
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Xiao Y, Liu C, Chen Z, Blatchley MR, Kim D, Zhou J, Xu M, Gerecht S, Fan R. Senescent Cells with Augmented Cytokine Production for Microvascular Bioengineering and Tissue Repairs. ADVANCED BIOSYSTEMS 2019; 3:1900089. [PMID: 32270028 PMCID: PMC7141414 DOI: 10.1002/adbi.201900089] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Indexed: 12/19/2022]
Abstract
Controlled delivery of cytokines and growth factors has been an area of intense research interest for molecular and cellular bioengineering, immunotherapy, and regenerative medicine. In this study, we show that primary human lung fibroblasts chemically induced to senescence (cell cycle arrest) can act as a living source to transiently produce factors essential for promoting vasculogenesis or angiogenesis, such as VEGF, HGF, and IL-8. Co-culture of senescent fibroblasts with HUVECs in a fibrin gel demonstrated accelerated formation and maturation of microvessel networks in as early as three days. Unlike the usage of non-senescent fibroblasts as the angiogenesis-promoting cells, this approach eliminates drawbacks related to the overproliferation of fibroblasts and the subsequent disruption of tissue architecture, integrity, or function. Co-culture of pancreatic islets with senescent fibroblasts and endothelial cells in a gel matrix maintains the viability and function of islets ex vivo for up to five days. Applying senescent fibroblasts to wound repair in vivo led to increased blood flow in a diabetic mouse model. Together, this work points to a new direction for engineering the delivery of cytokines and growth factors that promote microvascular tissue engineering and tissue repairs.
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Affiliation(s)
- Yang Xiao
- Department of Biomedical Engineering, Yale University, New Haven, CT 06520, U.S.A
| | - Chang Liu
- Department of Biomedical Engineering, Yale University, New Haven, CT 06520, U.S.A
| | - Zhuo Chen
- Department of Biomedical Engineering, Yale University, New Haven, CT 06520, U.S.A
| | - Michael R. Blatchley
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 20218, U.S.A
- Department of Chemical and Biomolecular Engineering, Institute for NanoBioTechnology, Johns Hopkins University Baltimore, MD 20218, U.S.A
| | - Dongjoo Kim
- Department of Biomedical Engineering, Yale University, New Haven, CT 06520, U.S.A
| | - Jing Zhou
- Department of Biomedical Engineering, Yale University, New Haven, CT 06520, U.S.A
- Department of Anesthesiology, Yale University, New Haven, CT 06520, U.S.A
| | - Ming Xu
- Department of Biomedical Engineering, Yale University, New Haven, CT 06520, U.S.A
| | - Sharon Gerecht
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 20218, U.S.A
- Department of Chemical and Biomolecular Engineering, Institute for NanoBioTechnology, Johns Hopkins University Baltimore, MD 20218, U.S.A
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 20218, U.S.A
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD 20218, U.S.A
| | - Rong Fan
- Department of Biomedical Engineering, Yale University, New Haven, CT 06520, U.S.A
- Yale Comprehensive Cancer Center, New Haven, CT 06520, U.S.A
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67
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Kong AM, Yap KK, Lim SY, Marre D, Pébay A, Gerrand YW, Lees JG, Palmer JA, Morrison WA, Mitchell GM. Bio-engineering a tissue flap utilizing a porous scaffold incorporating a human induced pluripotent stem cell-derived endothelial cell capillary network connected to a vascular pedicle. Acta Biomater 2019; 94:281-294. [PMID: 31152943 DOI: 10.1016/j.actbio.2019.05.067] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 05/21/2019] [Accepted: 05/28/2019] [Indexed: 01/18/2023]
Abstract
Tissue flaps are used to cover large/poorly healing wounds, but involve complex surgery and donor site morbidity. In this study a tissue flap is assembled using the mammalian body as a bioreactor to functionally connect an artery and vein to a human capillary network assembled from induced pluripotent stem cell-derived endothelial cells (hiPSC ECs). In vitro: Porous NovoSorb™ scaffolds (3 mm × 1.35 mm) were seeded with 200,000 hiPSC ECs ± 100,000 human vascular smooth muscle cells (hvSMC), and cultured for 1-3 days, with capillaries formed by 24 h which were CD31+, VE-Cadherin+, EphB4+, VEGFR2+ and Ki67+, whilst hvSMCs (calponin+) attached abluminally. In vivo: In SCID mice, bi-lateral epigastric vascular pedicles were isolated in a silicone chamber for a 3 week 'delay period' for pedicle capillary sprouting, then reopened, and two hiPSC EC ± hvSMCs seeded scaffolds transplanted over the pedicle. The chamber was either resealed (Group 1), or removed and surrounding tissue secured around the pedicle + scaffolds (Group 2), for 1 or 2 weeks. Human capillaries survived in vivo and were CD31+, VE-Cadherin+ and VEGFR2+. Human vSMCs remained attached, and host mesenchymal cells also attached abluminally. Systemically injected FITC-dextran present in human capillary lumens indicated inosculation to host capillaries. Human iPSC EC capillary morphometric parameters at one week in vivo were equal to or higher than the same parameters measured in human abdominal skin. This 'proof of concept' study has demonstrated that bio-engineering an autologous human tissue flap based on hiPSC EC could minimize the use of donor flaps and has potential applications for complex wound coverage. STATEMENT OF SIGNIFICANCE: Tissue flaps, used for surgical reconstruction of wounds, require complex surgery, often associated with morbidity. Bio-engineering a simpler alternative, we assembled a human induced pluripotent stem cell derived endothelial cell (hiPSC ECs) capillary network in a porous scaffold in vitro, which when transplanted over a mouse vascular pedicle in vivo formed a functional tissue flap with mouse blood flow in the human capillaries. Therefore it is feasible to form an autologous tissue flap derived from a hiPSC EC capillary network assembled in vitro, and functionally connect to a vascular pedicle in vivo that could be utilized in complex wound repair for chronic or acute wounds.
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Affiliation(s)
- Anne M Kong
- O'Brien Institute Dept. of St Vincent's Institute, Melbourne, Australia
| | - Kiryu K Yap
- O'Brien Institute Dept. of St Vincent's Institute, Melbourne, Australia; Univ. of Melbourne, Dept. of Surgery at St Vincent's Hospital, Melbourne, Australia; Department of Plastic and Reconstructive Surgery, St Vincent's Hospital, Melbourne, Australia
| | - Shiang Y Lim
- O'Brien Institute Dept. of St Vincent's Institute, Melbourne, Australia; Univ. of Melbourne, Dept. of Surgery at St Vincent's Hospital, Melbourne, Australia
| | - Diego Marre
- O'Brien Institute Dept. of St Vincent's Institute, Melbourne, Australia
| | - Alice Pébay
- Department of Surgery, The University of Melbourne, Melbourne, Victoria 3010, Australia; Department of Anatomy and Neuroscience, The University of Melbourne, Victoria 3010, Australia
| | - Yi-Wen Gerrand
- O'Brien Institute Dept. of St Vincent's Institute, Melbourne, Australia
| | - Jarmon G Lees
- O'Brien Institute Dept. of St Vincent's Institute, Melbourne, Australia
| | - Jason A Palmer
- O'Brien Institute Dept. of St Vincent's Institute, Melbourne, Australia
| | - Wayne A Morrison
- O'Brien Institute Dept. of St Vincent's Institute, Melbourne, Australia; Univ. of Melbourne, Dept. of Surgery at St Vincent's Hospital, Melbourne, Australia; Faculty of Health Sciences, Australian Catholic University, Fitzroy, Melbourne, Australia; Department of Plastic and Reconstructive Surgery, St Vincent's Hospital, Melbourne, Australia
| | - Geraldine M Mitchell
- O'Brien Institute Dept. of St Vincent's Institute, Melbourne, Australia; Univ. of Melbourne, Dept. of Surgery at St Vincent's Hospital, Melbourne, Australia; Faculty of Health Sciences, Australian Catholic University, Fitzroy, Melbourne, Australia.
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68
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Regenerative and durable small-diameter graft as an arterial conduit. Proc Natl Acad Sci U S A 2019; 116:12710-12719. [PMID: 31182572 DOI: 10.1073/pnas.1905966116] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Despite significant research efforts, clinical practice for arterial bypass surgery has been stagnant, and engineered grafts continue to face postimplantation challenges. Here, we describe the development and application of a durable small-diameter vascular graft with tailored regenerative capacity. We fabricated small-diameter vascular grafts by electrospinning fibrin tubes and poly(ε-caprolactone) fibrous sheaths, which improved suture retention strength and enabled long-term survival. Using surface topography in a hollow fibrin microfiber tube, we enable immediate, controlled perfusion and formation of a confluent endothelium within 3-4 days in vitro with human endothelial colony-forming cells, but a stable endothelium is noticeable at 4 weeks in vivo. Implantation of acellular or endothelialized fibrin grafts with an external ultrathin poly(ε-caprolactone) sheath as an interposition graft in the abdominal aorta of a severe combined immunodeficient Beige mouse model supports normal blood flow and vessel patency for 24 weeks. Mechanical properties of the implanted grafts closely approximate the native abdominal aorta properties after just 1 week in vivo. Fibrin mediated cellular remodeling, stable tunica intima and media formation, and abundant matrix deposition with organized collagen layers and wavy elastin lamellae. Endothelialized grafts evidenced controlled healthy remodeling with delayed and reduced macrophage infiltration alongside neo vasa vasorum-like structure formation, reduced calcification, and accelerated tunica media formation. Our studies establish a small-diameter graft that is fabricated in less than 1 week, mediates neotissue formation and incorporation into the native tissue, and matches the native vessel size and mechanical properties, overcoming main challenges in arterial bypass surgery.
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69
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da Silva LP, Reis RL, Correlo VM, Marques AP. Hydrogel-Based Strategies to Advance Therapies for Chronic Skin Wounds. Annu Rev Biomed Eng 2019; 21:145-169. [DOI: 10.1146/annurev-bioeng-060418-052422] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Chronic skin wounds are the leading cause of nontraumatic foot amputations worldwide and present a significant risk of morbidity and mortality due to the lack of efficient therapies. The intrinsic characteristics of hydrogels allow them to benefit cutaneous healing essentially by supporting a moist environment. This property has long been explored in wound management to aid in autolytic debridement. However, chronic wounds require additional therapeutic features that can be provided by a combination of hydrogels with biochemical mediators or cells, promoting faster and better healing. We survey hydrogel-based approaches with potential to improve the healing of chronic wounds by reviewing their effects as observed in preclinical models. Topics covered include strategies to ablate infection and resolve inflammation, the delivery of bioactive agents to accelerate healing, and tissue engineering approaches for skin regeneration. The article concludes by considering the relevance of treating chronic skin wounds using hydrogel-based strategies.
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Affiliation(s)
- Lucília P. da Silva
- 3B's Research Group, I3B's: Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, and Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, 4805-017 Barco, Guimarães, Portugal;, , ,
- ICVS/3B's: PT Government Associate Laboratory, 4710-057 Braga, Guimarães, Portugal
| | - Rui L. Reis
- 3B's Research Group, I3B's: Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, and Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, 4805-017 Barco, Guimarães, Portugal;, , ,
- ICVS/3B's: PT Government Associate Laboratory, 4710-057 Braga, Guimarães, Portugal
- Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, 4805-017 Barco, Guimarães, Portugal
| | - Vitor M. Correlo
- 3B's Research Group, I3B's: Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, and Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, 4805-017 Barco, Guimarães, Portugal;, , ,
- ICVS/3B's: PT Government Associate Laboratory, 4710-057 Braga, Guimarães, Portugal
- Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, 4805-017 Barco, Guimarães, Portugal
| | - Alexandra P. Marques
- 3B's Research Group, I3B's: Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, and Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, 4805-017 Barco, Guimarães, Portugal;, , ,
- ICVS/3B's: PT Government Associate Laboratory, 4710-057 Braga, Guimarães, Portugal
- Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, 4805-017 Barco, Guimarães, Portugal
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70
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Browne S, Healy KE. Matrix-assisted cell transplantation for tissue vascularization. Adv Drug Deliv Rev 2019; 146:155-169. [PMID: 30605738 DOI: 10.1016/j.addr.2018.12.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 10/30/2018] [Accepted: 12/27/2018] [Indexed: 12/20/2022]
Abstract
Cell therapy offers much promise for the treatment of ischemic diseases by augmenting tissue vasculogenesis. Matrix-assisted cell transplantation (MACT) has been proposed as a solution to enhance cell survival and integration with host tissue following transplantation. By designing semi synthetic matrices (sECM) with the correct physical and biochemical signals, encapsulated cells are directed towards a more angiogenic phenotype. In this review, we describe the choice of cells suitable for pro-angiogenic therapies, the properties that should be considered when designing sECM for transplantation and their relative importance. Pre-clinical models where MACT has been successfully applied to promote angiogenesis are reviewed to show the great potential of this strategy to treat ischemic conditions.
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Affiliation(s)
- Shane Browne
- Department of Bioengineering, University of California, Berkeley, CA 94720, USA; Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA; Centre for Research in Medical Devices (CÚRAM), National University of Ireland, Galway, Ireland
| | - Kevin E Healy
- Department of Bioengineering, University of California, Berkeley, CA 94720, USA; Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.
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71
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Cho H, Blatchley MR, Duh EJ, Gerecht S. Acellular and cellular approaches to improve diabetic wound healing. Adv Drug Deliv Rev 2019; 146:267-288. [PMID: 30075168 DOI: 10.1016/j.addr.2018.07.019] [Citation(s) in RCA: 123] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 07/23/2018] [Accepted: 07/30/2018] [Indexed: 02/06/2023]
Abstract
Chronic diabetic wounds represent a huge socioeconomic burden for both affected individuals and the entire healthcare system. Although the number of available treatment options as well as our understanding of wound healing mechanisms associated with diabetes has vastly improved over the past decades, there still remains a great need for additional therapeutic options. Tissue engineering and regenerative medicine approaches provide great advantages over conventional treatment options, which are mainly aimed at wound closure rather than addressing the underlying pathophysiology of diabetic wounds. Recent advances in biomaterials and stem cell research presented in this review provide novel ways to tackle different molecular and cellular culprits responsible for chronic and nonhealing wounds by delivering therapeutic agents in direct or indirect ways. Careful integration of different approaches presented in the current article could lead to the development of new therapeutic platforms that can address multiple pathophysiologic abnormalities and facilitate wound healing in patients with diabetes.
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Affiliation(s)
- Hongkwan Cho
- Wilmer Ophthalmologic Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Michael R Blatchley
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA; Department of Chemical and Biomolecular Engineering, Institute for NanoBioTechnology, Johns Hopkins University Baltimore, MD, USA
| | - Elia J Duh
- Wilmer Ophthalmologic Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Sharon Gerecht
- Department of Chemical and Biomolecular Engineering, Institute for NanoBioTechnology, Johns Hopkins University Baltimore, MD, USA.
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72
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Engineering blood vessels and vascularized tissues: technology trends and potential clinical applications. Clin Sci (Lond) 2019; 133:1115-1135. [DOI: 10.1042/cs20180155] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 04/05/2019] [Accepted: 04/08/2019] [Indexed: 02/06/2023]
Abstract
Abstract
Vascular tissue engineering has the potential to make a significant impact on the treatment of a wide variety of medical conditions, including providing in vitro generated vascularized tissue and organ constructs for transplantation. Since the first report on the construction of a biological blood vessel, significant research and technological advances have led to the generation of clinically relevant large and small diameter tissue engineered vascular grafts (TEVGs). However, developing a biocompatible blood-contacting surface is still a major challenge. Researchers are using biomimicry to generate functional vascular grafts and vascular networks. A multi-disciplinary approach is being used that includes biomaterials, cells, pro-angiogenic factors and microfabrication technologies. Techniques to achieve spatiotemporal control of vascularization include use of topographical engineering and controlled-release of growth/pro-angiogenic factors. Use of decellularized natural scaffolds has gained popularity for engineering complex vascularized organs for potential clinical use. Pre-vascularization of constructs prior to implantation has also been shown to enhance its anastomosis after implantation. Host-implant anastomosis is a phenomenon that is still not fully understood. However, it will be a critical factor in determining the in vivo success of a TEVGs or bioengineered organ. Many clinical studies have been conducted using TEVGs, but vascularized tissue/organ constructs are still in the research & development stage. In addition to technical challenges, there are commercialization and regulatory challenges that need to be addressed. In this review we examine recent advances in the field of vascular tissue engineering, with a focus on technology trends, challenges and potential clinical applications.
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73
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Gorecka J, Kostiuk V, Fereydooni A, Gonzalez L, Luo J, Dash B, Isaji T, Ono S, Liu S, Lee SR, Xu J, Liu J, Taniguchi R, Yastula B, Hsia HC, Qyang Y, Dardik A. The potential and limitations of induced pluripotent stem cells to achieve wound healing. Stem Cell Res Ther 2019; 10:87. [PMID: 30867069 PMCID: PMC6416973 DOI: 10.1186/s13287-019-1185-1] [Citation(s) in RCA: 113] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Wound healing is the physiologic response to a disruption in normal skin architecture and requires both spatial and temporal coordination of multiple cell types and cytokines. This complex process is prone to dysregulation secondary to local and systemic factors such as ischemia and diabetes that frequently lead to chronic wounds. Chronic wounds such as diabetic foot ulcers are epidemic with great cost to the healthcare system as they heal poorly and recur frequently, creating an urgent need for new and advanced therapies. Stem cell therapy is emerging as a potential treatment for chronic wounds, and adult-derived stem cells are currently employed in several commercially available products; however, stem cell therapy is limited by the need for invasive harvesting techniques, immunogenicity, and limited cell survival in vivo. Induced pluripotent stem cells (iPSC) are an exciting cell type with enhanced therapeutic and translational potential. iPSC are derived from adult cells by in vitro induction of pluripotency, obviating the ethical dilemmas surrounding the use of embryonic stem cells; they are harvested non-invasively and can be transplanted autologously, reducing immune rejection; and iPSC are the only cell type capable of being differentiated into all of the cell types in healthy skin. This review focuses on the use of iPSC in animal models of wound healing including limb ischemia, as well as their limitations and methods aimed at improving iPSC safety profile in an effort to hasten translation to human studies.
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Affiliation(s)
- Jolanta Gorecka
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA
| | - Valentyna Kostiuk
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA
| | - Arash Fereydooni
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA
| | - Luis Gonzalez
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA
| | - Jiesi Luo
- Section of Cardiovascular Medicine, Department of Internal Medicine, Yale Cardiovascular Research Center, Yale School of Medicine, 300 George Street, Ste 773A, New Haven, CT, 06511, USA
| | - Biraja Dash
- Section of Plastic Surgery, Department of Surgery, Yale School of Medicine, Yale University, PO Box 208062, New Haven, CT, 06520-8062, USA
| | - Toshihiko Isaji
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA
| | - Shun Ono
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA
| | - Shirley Liu
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA
| | - Shin Rong Lee
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA
| | - Jianbiao Xu
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA
| | - Jia Liu
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA
| | - Ryosuke Taniguchi
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA
| | - Bogdan Yastula
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA
| | - Henry C Hsia
- Section of Plastic Surgery, Department of Surgery, Yale School of Medicine, Yale University, PO Box 208062, New Haven, CT, 06520-8062, USA
| | - Yibing Qyang
- Section of Cardiovascular Medicine, Department of Internal Medicine, Yale Cardiovascular Research Center, Yale School of Medicine, 300 George Street, Ste 773A, New Haven, CT, 06511, USA.,Yale Stem Cell Center, Yale University, New Haven, USA.,Vascular Biology and Therapeutics Program, Yale School of Medicine, New Haven, USA.,Department of Pathology, Yale University, New Haven, USA
| | - Alan Dardik
- Vascular Biology and Therapeutics Program and the Department of Surgery, Yale School of Medicine, Yale University, 10 Amistad Street, Room 437, PO Box 208089, New Haven, CT, 06520-8089, USA.
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Wan W, Cai F, Huang J, Chen S, Liao Q. A skin-inspired 3D bilayer scaffold enhances granulation tissue formation and anti-infection for diabetic wound healing. J Mater Chem B 2019. [DOI: 10.1039/c8tb03341b] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
We design and fabricate a bilayer 3D scaffold inspired by the structure of skin. The top layer is made of silver loaded GelMA cryogel to prevent infection. The bottom layer is made of a PDGF-BB loaded 3D printed scaffold to promotes angiogenesis and collagen deposition to accelerate granulation tissue formation.
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Affiliation(s)
- Wenbing Wan
- Department of Orthopedics
- The Third Affiliated Hospital of Nanchang University
- Nanchang 330008
- China
| | - Feng Cai
- Department of Orthopedics
- The Third Affiliated Hospital of Nanchang University
- Nanchang 330008
- China
| | - Jiayu Huang
- Department of Orthopedics
- The Third Affiliated Hospital of Nanchang University
- Nanchang 330008
- China
| | - Shixuan Chen
- Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program
- University of Nebraska Medical Center
- Omaha
- USA
| | - Qi Liao
- Department of Orthopedics
- The Third Affiliated Hospital of Nanchang University
- Nanchang 330008
- China
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75
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Basu P, Narendrakumar U, Arunachalam R, Devi S, Manjubala I. Characterization and Evaluation of Carboxymethyl Cellulose-Based Films for Healing of Full-Thickness Wounds in Normal and Diabetic Rats. ACS OMEGA 2018; 3:12622-12632. [PMID: 30411013 PMCID: PMC6217532 DOI: 10.1021/acsomega.8b02015] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 09/20/2018] [Indexed: 05/16/2023]
Abstract
Artificial skin substitute made of polymeric films are of great demand in the field of skin tissue engineering. We report here the fabrication of carboxymethyl cellulose (CMC) and poly(ethylene glycol) (PEG) blend films by solution casting method for wound healing applications. The physicochemical characteristics and the thermal stability of the films were analyzed. The surface morphology shows crystalline structures with large hexagonal-like platelet crystals of CMC on the surface of the films. Pure CMC films exhibited higher tensile strength than the CMC/PEG blend films. The swelling ratio (SR) of the films was influenced by the pH of Tris-HCL buffer (2.0, 5.0, and 7.0), which increased with increase in pH. The hemocompatibility assay and cytotoxicity test using NIH 3T3 fibroblast cells showed that the films were biocompatible. To evaluate the wound healing efficacy, the films were applied in full-thickness wounds created in normal and diabetic Wistar albino rats. The wounds healed faster with pure CMC film compared to blend films in both normal and diabetic rats, evidenced by intensive collagen formation in histopathological analysis. Thus, the films have potential application in skin regeneration, thereby to restore the structural and functional characteristics of the skin.
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Affiliation(s)
- Poulami Basu
- Department
of Bio Sciences, School of Bio Sciences and Technology, and Department of
Manufacturing, School of Mechanical Engineering, Vellore Institute of Technology, Vellore 632014, India
| | - Uttamchand Narendrakumar
- Department
of Bio Sciences, School of Bio Sciences and Technology, and Department of
Manufacturing, School of Mechanical Engineering, Vellore Institute of Technology, Vellore 632014, India
| | - Ruckmani Arunachalam
- Department
of Pharmacology, Chettinad Hospital and
Research Institute, Chettinad Academy of Research and Education, Chennai 603103, India
| | - Sobita Devi
- Department
of Pharmacology, Chettinad Hospital and
Research Institute, Chettinad Academy of Research and Education, Chennai 603103, India
| | - Inderchand Manjubala
- Department
of Bio Sciences, School of Bio Sciences and Technology, and Department of
Manufacturing, School of Mechanical Engineering, Vellore Institute of Technology, Vellore 632014, India
- E-mail:
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76
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Seo JY, Lee B, Kang TW, Noh JH, Kim MJ, Ji YB, Ju HJ, Min BH, Kim MS. Electrostatically Interactive Injectable Hydrogels for Drug Delivery. Tissue Eng Regen Med 2018; 15:513-520. [PMID: 30603575 PMCID: PMC6171702 DOI: 10.1007/s13770-018-0146-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 07/03/2018] [Accepted: 07/15/2018] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Several injectable hydrogels have been developed extensively for a broad range of biomedical applications. Injectable hydrogels forming in situ through the change in external stimuli have the distinct properties of easy management and minimal invasiveness, and thus provide the advantage of bypassing surgical procedures for administration resulting in better patient compliance. METHODS The injectable in situ-forming hydrogels can be formed irreversibly or reversibly under physiological stimuli. Among several external stimuli that induce formation of hydrogels in situ, in this review, we focused on the electrostatic interactions as the most simple and interesting stimulus. RESULTS Currently, numerous polyelectrolytes have been reported as potential electrostatically interactive in situ-forming hydrogels. In this review, a comprehensive overview of the rapidly developing electrostatically interactive in situ-forming hydrogels, which are produced by various anionic and cationic polyelectrolytes such as chitosan, celluloses, and alginates, has been outlined and summarized. Further, their biomedical applications have also been discussed. CONCLUSION The review concludes with perspectives on the future of electrostatically interactive in situ-forming hydrogels.
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Affiliation(s)
- Ji Young Seo
- Department of Molecular Science and Technology, Ajou University, 206 Worldcup-ro, Yeongton-gu, Suwon, 16499 Republic of Korea
| | - Bong Lee
- Department of Polymer Engineering, Pukyong National University, 45 Yongso-ro, Nam-Gu, Busan, 48513 Republic of Korea
| | - Tae Woong Kang
- Department of Molecular Science and Technology, Ajou University, 206 Worldcup-ro, Yeongton-gu, Suwon, 16499 Republic of Korea
| | - Jung Hyun Noh
- Department of Molecular Science and Technology, Ajou University, 206 Worldcup-ro, Yeongton-gu, Suwon, 16499 Republic of Korea
| | - Min Ju Kim
- Department of Molecular Science and Technology, Ajou University, 206 Worldcup-ro, Yeongton-gu, Suwon, 16499 Republic of Korea
| | - Yun Bae Ji
- Department of Molecular Science and Technology, Ajou University, 206 Worldcup-ro, Yeongton-gu, Suwon, 16499 Republic of Korea
| | - Hyeon Jin Ju
- Department of Molecular Science and Technology, Ajou University, 206 Worldcup-ro, Yeongton-gu, Suwon, 16499 Republic of Korea
| | - Byoung Hyun Min
- Department of Molecular Science and Technology, Ajou University, 206 Worldcup-ro, Yeongton-gu, Suwon, 16499 Republic of Korea
- Cell Therapy Center, Ajou University Medical Center, 206 Worldcup-ro, Yeongton-gu, Suwon, 16499 Republic of Korea
| | - Moon Suk Kim
- Department of Molecular Science and Technology, Ajou University, 206 Worldcup-ro, Yeongton-gu, Suwon, 16499 Republic of Korea
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77
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The use of hydrogels for cell-based treatment of chronic kidney disease. Clin Sci (Lond) 2018; 132:1977-1994. [PMID: 30220651 DOI: 10.1042/cs20180434] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 08/01/2018] [Accepted: 08/17/2018] [Indexed: 12/13/2022]
Abstract
Chronic kidney disease (CKD) is a major and growing public health concern with increasing incidence and prevalence worldwide. The therapeutic potential of stem cell therapy, including mesenchymal stem cells (MSCs) and endothelial progenitor cells (EPCs) holds great promise for treatment of CKD. However, there are significant bottlenecks in the clinical translation due to the reduced number of transplanted cells and the duration of their presence at the site of tissue damage. Bioengineered hydrogels may provide a route of cell delivery to enhance treatment efficacy and optimise the targeting effectiveness while minimising any loss of cell function. In this review, we highlight the advances in stem cell therapy targeting kidney disease and discuss the emerging role of hydrogel delivery systems to fully realise the potential of adult stem cells as a regenerative therapy for CKD in humans. MSCs and EPCs mediate kidney repair through distinct paracrine effects. As a delivery system, hydrogels can prolong these paracrine effects by improving retention at the site of injury and protecting the transplanted cells from the harsh inflammatory microenvironment. We also discuss the features of a hydrogel, which may be tuned to optimise the therapeutic potential of encapsulated stem cells, including cell-adhesive epitopes, material stiffness, nanotopography, modes of gelation and degradation and the inclusion of bioactive molecules. This review concludes with a discussion of the challenges to be met for the widespread clinical use of hydrogel delivery system of stem cell therapy for CKD.
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78
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A Novel Substance P-Based Hydrogel for Increased Wound Healing Efficiency. Molecules 2018; 23:molecules23092215. [PMID: 30200361 PMCID: PMC6225281 DOI: 10.3390/molecules23092215] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 08/29/2018] [Accepted: 08/30/2018] [Indexed: 11/17/2022] Open
Abstract
The neuropeptide substance P (SP) is known to stimulate wound healing by regulating the production of relevant cytokines as well as cell proliferation and migration. However, the therapeutic application of SP is limited by its low stability under biological conditions and oxidation during purification, formulation, and storage. To address this problem, we developed a novel formulation of SP as an SP gel, and investigated its wound healing activity both in vitro and in vivo. SP in SP gel was stable at various temperatures for up to 4 weeks. In vitro, SP gel exhibited more potential as a candidate wound-healing agent than SP alone, as evidenced by the observed increases in the proliferation and migration of human epidermal keratinocytes and human dermal fibroblasts. In vivo experiments showed that SP gel treatment enhanced the healing of full-thickness wounds in mice as compared to SP alone. These results demonstrate the benefits of SP gel as a promising topical agent for wound treatment.
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79
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Blache U, Ehrbar M. Inspired by Nature: Hydrogels as Versatile Tools for Vascular Engineering. Adv Wound Care (New Rochelle) 2018; 7:232-246. [PMID: 29984113 PMCID: PMC6032659 DOI: 10.1089/wound.2017.0760] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Accepted: 10/22/2017] [Indexed: 12/21/2022] Open
Abstract
Significance: Diseases related to vascular malfunction, hyper-vascularization, or lack of vascularization are among the leading causes of morbidity and mortality. Engineered, vascularized tissues as well as angiogenic growth factor-releasing hydrogels could replace defective tissues. Further, treatments and testing of novel vascular therapeutics will benefit significantly from models that allow for the study of vascularized tissues under physiological relevant in vitro conditions. Recent Advances: Inspired by fibrin, the provisional matrix during wound healing, naturally derived and synthetic hydrogel scaffolds have been developed for vascular engineering. Today, engineers and biologists use commercially available hydrogels to pre-vascularize tissues, to control the delivery of angiogenic growth factors, and to establish vascular diseases models. Critical Issue: For clinical translation, pre-vascularized tissue constructs must be sufficiently large and stable to substitute function-relevant tissue defects and integrate with host vascular perfusion. Moreover, the continuous integration of knowhow from basic vascular biology with innovative, tailorable materials and advanced manufacturing technologies is key to achieving near-physiological tissue models and new treatments to control vascularization. Future Directions: For transplantation, engineered tissues must comprise hierarchically organized vascular trees of different caliber and function. The development of novel vascularization-promoting or -inhibiting therapeutics will benefit from physiologically relevant vessel models. In addition, tissue models representing treatment-relevant vascular tissue functions will increase the capacity to screen for therapeutic compounds and will significantly reduce the need for animals for their validation.
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Affiliation(s)
- Ulrich Blache
- Department of Obstetrics, University and University Hospital Zurich, Zurich, Switzerland
- Department of Health Sciences and Technology, Institute for Biomechanics, ETH Zurich, Zurich, Switzerland
| | - Martin Ehrbar
- Department of Obstetrics, University and University Hospital Zurich, Zurich, Switzerland
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80
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Browne S, Jha AK, Ameri K, Marcus SG, Yeghiazarians Y, Healy KE. TGF-β1/CD105 signaling controls vascular network formation within growth factor sequestering hyaluronic acid hydrogels. PLoS One 2018; 13:e0194679. [PMID: 29566045 PMCID: PMC5864059 DOI: 10.1371/journal.pone.0194679] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Accepted: 03/07/2018] [Indexed: 12/17/2022] Open
Abstract
Cell-based strategies for the treatment of ischemic diseases are at the forefront of tissue engineering and regenerative medicine. Cell therapies purportedly can play a key role in the neovascularization of ischemic tissue; however, low survival and poor cell engraftment with the host vasculature following implantation limits their potential to treat ischemic diseases. To overcome these limitations, we previously developed a growth factor sequestering hyaluronic acid (HyA)-based hydrogel that enhanced transplanted mouse cardiosphere-derived cell survival and formation of vasculature that anastomosed with host vessels. In this work, we examined the mechanism by which HyA hydrogels presenting transforming growth factor beta-1 (TGF-β1) promoted proliferation of more clinically relevant human cardiosphere-derived cells (hCDC), and their formation of vascular-like networks in vitro. We observed hCDC proliferation and enhanced formation of vascular-like networks occurred in the presence of TGF-β1. Furthermore, production of nitric oxide (NO), VEGF, and a host of angiogenic factors were increased in the presence of TGF-β1. This response was dependent on the co-activity of CD105 (Endoglin) with the TGF-βR2 receptor, demonstrating its role in the process of angiogenic differentiation and vascular organization of hCDC. These results demonstrated that hCDC form vascular-like networks in vitro, and that the induction of vascular networks by hCDC within growth factor sequestering HyA hydrogels was mediated by TGF-β1/CD105 signaling.
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Affiliation(s)
- Shane Browne
- Departments of Bioengineering and Materials Science and Engineering, University of California, Berkeley, CA, United States of America
- Centre for Research in Medical Devices (CÚRAM), National University of Ireland Galway, Galway, Ireland
| | - Amit K. Jha
- Departments of Bioengineering and Materials Science and Engineering, University of California, Berkeley, CA, United States of America
| | - Kurosh Ameri
- Department of Medicine, University of California, San Francisco, CA, United States of America
| | - Sivan G. Marcus
- Departments of Bioengineering and Materials Science and Engineering, University of California, Berkeley, CA, United States of America
| | - Yerem Yeghiazarians
- Department of Medicine, University of California, San Francisco, CA, United States of America
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, CA, United States of America
- Cardiovascular Research Institute, University of California, San Francisco, CA, United States of America
| | - Kevin E. Healy
- Departments of Bioengineering and Materials Science and Engineering, University of California, Berkeley, CA, United States of America
- * E-mail:
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81
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Abstract
The normal wound healing process involves a well-organized cascade of biological pathways and any failure in this process leads to wounds becoming chronic. Non-healing wounds are a burden on healthcare systems and set to increase with aging population and growing incidences of obesity and diabetes. Stem cell-based therapies have the potential to heal chronic wounds but have so far seen little success in the clinic. Current research has been focused on using polymeric biomaterial systems that can act as a niche for these stem cells to improve their survival and paracrine activity that would eventually promote wound healing. Furthermore, different modification strategies have been developed to improve stem cell survival and differentiation, ultimately promoting regenerative wound healing. This review focuses on advanced polymeric scaffolds that have been used to deliver stem cells and have been tested for their efficiency in preclinical animal models of wounds.
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82
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Song HHG, Rumma RT, Ozaki CK, Edelman ER, Chen CS. Vascular Tissue Engineering: Progress, Challenges, and Clinical Promise. Cell Stem Cell 2018; 22:340-354. [PMID: 29499152 PMCID: PMC5849079 DOI: 10.1016/j.stem.2018.02.009] [Citation(s) in RCA: 267] [Impact Index Per Article: 44.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Although the clinical demand for bioengineered blood vessels continues to rise, current options for vascular conduits remain limited. The synergistic combination of emerging advances in tissue fabrication and stem cell engineering promises new strategies for engineering autologous blood vessels that recapitulate not only the mechanical properties of native vessels but also their biological function. Here we explore recent bioengineering advances in creating functional blood macro and microvessels, particularly featuring stem cells as a seed source. We also highlight progress in integrating engineered vascular tissues with the host after implantation as well as the exciting pre-clinical and clinical applications of this technology.
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Affiliation(s)
- H-H Greco Song
- Harvard-MIT Program in Health Sciences and Technology, Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Biological Design Center, Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA; Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA
| | - Rowza T Rumma
- Harvard-MIT Program in Health Sciences and Technology, Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - C Keith Ozaki
- Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Elazer R Edelman
- Harvard-MIT Program in Health Sciences and Technology, Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Division of Cardiology, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Christopher S Chen
- Biological Design Center, Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA; Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
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83
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Han HM, Ko S, Cheong MJ, Bang JK, Seo CH, Luchian T, Park Y. Myxinidin2 and myxinidin3 suppress inflammatory responses through STAT3 and MAPKs to promote wound healing. Oncotarget 2017; 8:87582-87597. [PMID: 29152103 PMCID: PMC5675655 DOI: 10.18632/oncotarget.20908] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Accepted: 08/27/2017] [Indexed: 02/07/2023] Open
Abstract
Skin wounds are continuously exposed to bacteria and can easily become infected. Infected wounds require antibiotic treatment, and infections caused by drug-resistant bacteria are an important public health problem. Antimicrobial peptides have broad-spectrum antibacterial activity, induce little or no drug resistance and may be suitable for treating skin infections caused by drug-resistant bacteria. We previously reported the design and function of myxinidin and myxinidin analogues. Here we showed that myxinidin2 and myxinidin3 exhibit antimicrobial and anti-biofilm activities against antibiotic-resistant Staphylococcus aureus, Acinetobacter baumannii, and Pseudomonas aeruginosa in high salt environments and in gelatin. Moreover, these peptides facilitated infected wound healing by decreasing inflammation through suppression of IL-6, IL-8, and TNF-α and regulation of downstream mediators such as STAT3, p38, JNK, and EGFR. In a mouse skin wound model infected with antibiotic-resistant bacteria, myxinidin2 and myxinidin3 eliminated the infection and enhanced wound healing. We therefore propose the use of these peptides for treating infected wounds and burns.
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Affiliation(s)
- Hyo Mi Han
- Department of Biomedical Science, Chosun University, Gwangju, Korea
| | - Sujin Ko
- Department of Biomedical Science, Chosun University, Gwangju, Korea
| | - Min-Ju Cheong
- Department of Life Science, Chosun University, Gwangju, Korea
| | - Jeong Kyu Bang
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Korea
| | - Chang Ho Seo
- Department of Bioinformatics, Kongju National University, Kongju, Korea
| | - Tudor Luchian
- Department of Physics, Alexandru I. Cuza University, Iasi, Romania
| | - Yoonkyung Park
- Department of Biomedical Science, Chosun University, Gwangju, Korea.,Research Center for Proteinaceous Materials, Chosun University, Gwangju, Korea
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84
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Ho J, Walsh C, Yue D, Dardik A, Cheema U. Current Advancements and Strategies in Tissue Engineering for Wound Healing: A Comprehensive Review. Adv Wound Care (New Rochelle) 2017; 6:191-209. [PMID: 28616360 PMCID: PMC5467128 DOI: 10.1089/wound.2016.0723] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Accepted: 02/09/2017] [Indexed: 12/20/2022] Open
Abstract
Significance: With an aging population leading to an increase in diabetes and associated cutaneous wounds, there is a pressing clinical need to improve wound-healing therapies. Recent Advances: Tissue engineering approaches for wound healing and skin regeneration have been developed over the past few decades. A review of current literature has identified common themes and strategies that are proving successful within the field: The delivery of cells, mainly mesenchymal stem cells, within scaffolds of the native matrix is one such strategy. We overview these approaches and give insights into mechanisms that aid wound healing in different clinical scenarios. Critical Issues: We discuss the importance of the biomimetic niche, and how recapitulating elements of the native microenvironment of cells can help direct cell behavior and fate. Future Directions: It is crucial that during the continued development of tissue engineering in wound repair, there is close collaboration between tissue engineers and clinicians to maintain the translational efficacy of this approach.
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Affiliation(s)
- Jasmine Ho
- UCL Division of Surgery and Interventional Sciences, UCL Institute for Orthopaedics and Musculoskeletal Sciences, University College London, London, United Kingdom
| | - Claire Walsh
- UCL Division of Surgery and Interventional Sciences, UCL Institute for Orthopaedics and Musculoskeletal Sciences, University College London, London, United Kingdom
| | - Dominic Yue
- Department of Plastic and Reconstructive Surgery, Royal Stoke University Hospital, Stoke-on-Trent, United Kingdom
| | - Alan Dardik
- The Vascular Biology and Therapeutics Program and the Department of Surgery, Yale University School of Medicine, New Haven, Connecticut
| | - Umber Cheema
- UCL Division of Surgery and Interventional Sciences, UCL Institute for Orthopaedics and Musculoskeletal Sciences, University College London, London, United Kingdom
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85
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Shams E, Yeganeh H, Naderi-Manesh H, Gharibi R, Mohammad Hassan Z. Polyurethane/siloxane membranes containing graphene oxide nanoplatelets as antimicrobial wound dressings: in vitro and in vivo evaluations. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2017; 28:75. [PMID: 28386852 DOI: 10.1007/s10856-017-5881-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 03/08/2017] [Indexed: 05/20/2023]
Abstract
Preserving wounds from bacterial and fungal infections and retaining optimum moist environment over damaged tissue are major challenges in wound care management. Application of wound dressings with antimicrobial activity and appropriate wound exudates handling ability is of particular significance for promoting wound healing. To this end, preparation and evaluation of novel wound dres1sings made from polyurethane/siloxane network containing graphene oxide (GO) nanoplatelets are described. The particular sol-gel hydrolysis/condensation procedure applied for the preparation of dressings leads to an appropriate distribution of GO nanoplatelets in the dressing membranes. The crosslinked siloxane domains and the presence of GO nanoplatelets within polymeric chains offered necessary mechanical strength for dressings. Meanwhile, a combination of hydrophilic and hydrophobic moieties in dressing backbone enabled suitable wound exudate management. Therefore, both of physical protection from external forces and preservation of moist environment over wound were attained by using the designed dressings. Widespread antimicrobial activity against gram-positive, gram-negative and fungal strains was recorded for the dressing with the optimum amount of GO, meanwhile, very good cytocompatibility against fibroblast cells was noted for these dressings. In vivo assay of the GO containing dressing on rat animal model reveals that the dressing can promote wound healing by complete re-epithelization, enhanced vascularization and collagen deposition on healed tissue.
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Affiliation(s)
- Elias Shams
- Department of Nanobiotechnology/Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, PO Box 14115-154, Tehran, Iran
| | - Hamid Yeganeh
- Iran Polymer and petrochemical Institute, PO Box 14965/115, Tehran, Iran.
| | - Hossein Naderi-Manesh
- Department of Nanobiotechnology/Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, PO Box 14115-154, Tehran, Iran.
| | - Reza Gharibi
- Faculty of Chemistry, Kharazmi University, Tehran, Iran
| | - Zuhair Mohammad Hassan
- Department of Immunology, School of Medical Science, Tarbiat Modares University, PO Box 14115-331, Tehran, Iran
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86
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Xu C, Li Q, Hu XT, Wang CF, Chen S. Dually crosslinked self-healing hydrogels originating from cell-enhanced effect. J Mater Chem B 2017; 5:3816-3822. [DOI: 10.1039/c7tb00824d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new simple cell-loaded route is developed to facilely prepare self-healing and biocompatible dually crosslinked hydrogels. This bio-hydrogel can be used as wound dressing in in vivo experiments to promote wound healing, showing potential in biomedical applications.
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Affiliation(s)
- Chen Xu
- State Key Laboratory of Pharmaceutical Biotechnology and School of Life Sciences
- Nanjing University
- Nanjing 210023
- P. R. China
| | - Qing Li
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Chemical Engineering
- Nanjing Tech University (former Nanjing University of Technology)
- Nanjing 210009
- P. R. China
| | - Xin-Ting Hu
- State Key Laboratory of Pharmaceutical Biotechnology and School of Life Sciences
- Nanjing University
- Nanjing 210023
- P. R. China
| | - Cai-Feng Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Chemical Engineering
- Nanjing Tech University (former Nanjing University of Technology)
- Nanjing 210009
- P. R. China
| | - Su Chen
- State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Chemical Engineering
- Nanjing Tech University (former Nanjing University of Technology)
- Nanjing 210009
- P. R. China
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87
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Choi HJ, Thambi T, Yang YH, Bang SI, Kim BS, Pyun DG, Lee DS. AgNP and rhEGF-incorporating synergistic polyurethane foam as a dressing material for scar-free healing of diabetic wounds. RSC Adv 2017. [DOI: 10.1039/c6ra27322j] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Synergistic polyurethane foams comprised of AgNPs and rhEGF (AgNP/rhEGF-PUFs) were developed to treat diabetic wounds, which exhibited complete wound closure.
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Affiliation(s)
- Hyun Jun Choi
- Biomedical Polymer R&D Institute
- T&L Co., Ltd
- Anseong 456-812
- Republic of Korea
| | - Thavasyappan Thambi
- School of Chemical Engineering
- College of Engineering
- Sungkyunkwan University
- Suwon 440-746
- Republic of Korea
| | - Yool Hee Yang
- Department of Plastic Surgery
- Samsung Medical Center
- Sungkyunkwan University
- School of Medicine
- Seoul 135-710
| | - Sa Ik Bang
- Department of Plastic Surgery
- Samsung Medical Center
- Sungkyunkwan University
- School of Medicine
- Seoul 135-710
| | - Bong Sup Kim
- School of Chemical Engineering
- College of Engineering
- Sungkyunkwan University
- Suwon 440-746
- Republic of Korea
| | - Do Gi Pyun
- Biomedical Polymer R&D Institute
- T&L Co., Ltd
- Anseong 456-812
- Republic of Korea
| | - Doo Sung Lee
- School of Chemical Engineering
- College of Engineering
- Sungkyunkwan University
- Suwon 440-746
- Republic of Korea
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88
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Wei Z, Zhao J, Chen YM, Zhang P, Zhang Q. Self-healing polysaccharide-based hydrogels as injectable carriers for neural stem cells. Sci Rep 2016; 6:37841. [PMID: 27897217 PMCID: PMC5126669 DOI: 10.1038/srep37841] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 10/27/2016] [Indexed: 12/21/2022] Open
Abstract
Self-healing injectable hydrogels can be formulated as three-dimensional carriers for the treatment of neurological diseases with desirable advantages, such as avoiding the potential risks of cell loss during injection, protecting cells from the shearing force of injection. However, the demands for biocompatible self-healing injectable hydrogels to meet above requirements and to promote the differentiation of neural stem cells (NSCs) into neurons remain a challenge. Herein, we developed a biocompatible self-healing polysaccharide-based hydrogel system as a novel injectable carrier for the delivery of NSCs. N-carboxyethyl chitosan (CEC) and oxidized sodium alginate (OSA) are the main backbones of the hydrogel networks, denoted as CEC-l-OSA hydrogel ("l" means "linked-by"). Owing to the dynamic imine cross-links formed by a Schiff reaction between amino groups on CEC and aldehyde groups on OSA, the hydrogel possesses the ability to self-heal into a integrity after being injected from needles under physiological conditions. The CEC-l-OSA hydrogel in which the stiffness mimicking nature brain tissues (100~1000 Pa) can be finely tuned to support the proliferation and neuronal differentiation of NSCs. The multi-functional, injectable, and self-healing CEC-l-OSA hydrogels hold great promises for NSC transplantation and further treatment of neurological diseases.
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Affiliation(s)
- Zhao Wei
- State Key Laboratory for Strength and Vibration of Mechanical Structures, International Center for Applied Mechanics and School of Aerospace, Collaborative Innovation Center of Suzhou Nano Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
| | - Jingyi Zhao
- Department of Anesthesiology, The Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an 710003, China
| | - Yong Mei Chen
- State Key Laboratory for Strength and Vibration of Mechanical Structures, International Center for Applied Mechanics and School of Aerospace, Collaborative Innovation Center of Suzhou Nano Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
| | - Pengbo Zhang
- Department of Anesthesiology, The Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an 710003, China
| | - Qiqing Zhang
- Institute of Biomedical and Pharmaceutical Technology, Fuzhou University, Fuzhou 350002, China, Fujian Guided Tissue Regeneration (GTR) Biotechnology Co., Ltd., Fuzhou 350108, China
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Diabetic wound regeneration using peptide-modified hydrogels to target re-epithelialization. Proc Natl Acad Sci U S A 2016; 113:E5792-E5801. [PMID: 27647919 DOI: 10.1073/pnas.1612277113] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
There is a clinical need for new, more effective treatments for chronic wounds in diabetic patients. Lack of epithelial cell migration is a hallmark of nonhealing wounds, and diabetes often involves endothelial dysfunction. Therefore, targeting re-epithelialization, which mainly involves keratinocytes, may improve therapeutic outcomes of current treatments. In this study, we present an integrin-binding prosurvival peptide derived from angiopoietin-1, QHREDGS (glutamine-histidine-arginine-glutamic acid-aspartic acid-glycine-serine), as a therapeutic candidate for diabetic wound treatments by demonstrating its efficacy in promoting the attachment, survival, and collective migration of human primary keratinocytes and the activation of protein kinase B Akt and MAPKp42/44 The QHREDGS peptide, both as a soluble supplement and when immobilized in a substrate, protected keratinocytes against hydrogen peroxide stress in a dose-dependent manner. Collective migration of both normal and diabetic human keratinocytes was promoted on chitosan-collagen films with the immobilized QHREDGS peptide. The clinical relevance was demonstrated further by assessing the chitosan-collagen hydrogel with immobilized QHREDGS in full-thickness excisional wounds in a db/db diabetic mouse model; QHREDGS showed significantly accelerated and enhanced wound closure compared with a clinically approved collagen wound dressing, peptide-free hydrogel, or blank wound controls. The accelerated wound closure resulted primarily from faster re-epithelialization and increased formation of granulation tissue. There were no observable differences in blood vessel density or size within the wound; however, the total number of blood vessels was greater in the peptide-hydrogel-treated wounds. Together, these findings indicate that QHREDGS is a promising candidate for wound-healing interventions that enhance re-epithelialization and the formation of granulation tissue.
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