1
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Kim E, Seo SH, Hwang Y, Ryu YC, Kim H, Lee KM, Lee JW, Park KH, Choi KY. Inhibiting the cytosolic function of CXXC5 accelerates diabetic wound healing by enhancing angiogenesis and skin repair. Exp Mol Med 2023; 55:1770-1782. [PMID: 37524876 PMCID: PMC10474114 DOI: 10.1038/s12276-023-01064-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Revised: 05/24/2023] [Accepted: 05/28/2023] [Indexed: 08/02/2023] Open
Abstract
Diabetic wound healing, including diabetic foot ulcer (DFU), is a serious complication of diabetes. Considering the complexity of DFU development, the identification of a factor that mediates multiple pathogeneses is important for treatment. In this study, we found that CXXC-type zinc finger protein 5 (CXXC5), a negative regulator of the Wnt/β-catenin pathway, was overexpressed with suppression of the Wnt/β-catenin pathway and its target genes involved in wound healing and angiogenesis in the wound tissues of DFU patients and diabetes-induced model mice. KY19334, a small molecule that activates the Wnt/β-catenin pathway by inhibiting the CXXC5-Dvl interaction, accelerated wound healing in diabetic mice. The enhancement of diabetic wound healing could be achieved by restoring the suppressed Wnt/β-catenin signaling and subsequently inducing its target genes. Moreover, KY19334 induced angiogenesis in hindlimb ischemia model mice. Overall, these findings revealed that restorative activation of Wnt/β-catenin signaling by inhibiting the function of cytosolic CXXC5 could be a therapeutic approach for treating DFUs.
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Affiliation(s)
- Eunhwan Kim
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Seol Hwa Seo
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Yumi Hwang
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Yeong Chan Ryu
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Heejene Kim
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Kyoung-Mi Lee
- Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, 03722, South Korea
| | - Jin Woo Lee
- Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, 03722, South Korea
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, South Korea
| | - Kwang Hwan Park
- Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, 03722, South Korea.
| | - Kang-Yell Choi
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea.
- CK Regeon Inc, Engineering Research Park, 50 Yonsei Ro, Seodaemun-Gu, Seoul, 03722, South Korea.
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2
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Wu M, Matar DY, Yu Z, Chen Z, Knoedler S, Ng B, Darwish O, Haug V, Friedman L, Orgill DP, Panayi AC. Modulation of Lymphangiogenesis in Incisional Murine Diabetic Wound Healing Using Negative Pressure Wound Therapy. Adv Wound Care (New Rochelle) 2023. [PMID: 36424821 DOI: 10.1089/wound.2022.0074] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Objective: Despite the significant function of lymphatics in wound healing, and frequent clinical use of Negative Pressure Wound Therapy (NPWT), the effect of mechanical force application on lymphangiogenesis remains to be elucidated. We utilize a murine incisional wound healing model to assess the mechanisms of lymphangiogenesis following NPWT. Approach: Dorsal incisional skin wounds were created on diabetic mice (genetically obese leptin receptor-deficient mice [db/db]; n = 30) and covered with an occlusive dressing (Control, n = 15) or NPWT (-125 mmHg, continuous, 24 h for 7 days; NPWT, n = 15). The wounds were macroscopically assessed for 28 days. Tissue was harvested on day 10 for analysis. Qualitative functional analysis of lymphatic drainage was performed on day 28 using Evans Blue staining (n = 2). Results: NPWT increased lymphatic vessel density (40 ± 20 vs. 12 ± 6 podoplanin [PDPN]+ and 25 ± 9 vs. 14 ± 8 lymphatic vessel endothelial receptor 1 [LYVE-1]+) and vessel diameter (28 ± 9 vs. 12 ± 2 μm). Western blotting verified the upregulation of LYVE-1 with NPWT. Leukocyte presence was higher with NPWT (22% ± 3.7% vs. 9.1% ± 4.1% lymphocyte common antigen [CD45]+) and the leukocytes were predominately B cells clustered within vessels (8.8% ± 2.5% vs. 18% ± 3.6% B-lymphocyte antigen CD20 [CD20]+). Macrophage presence was lower in the NPWT group. Lymphatic drainage was increased in the NPWT group, which exhibited greater Evans Blue positivity. Innovation: The lymphangiogenic effects take place independent of macrophage infiltration, appearing to correlate with B cell presence. Conclusion: NPWT promotes lymphangiogenesis in incisional wounds, significantly increasing the lymph vessel density and diameter. This study highlights the potential of NPWT to stimulate lymphatic drainage and wound healing of surgical incisions.
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Affiliation(s)
- Mengfan Wu
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.,Department of Plastic Surgery, Peking University Shenzhen Hospital, Shenzhen, China
| | - Dany Y Matar
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.,Department of Medicine, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Zhen Yu
- Opthalmology Department, Shenzhen Eye Hospital, Shenzhen Key Ophthalmic Laboratory, Jinan University, Shenzhen, China.,Angiogenesis Laboratory, Ophthalmology Department, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts, USA
| | - Ziyu Chen
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Samuel Knoedler
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.,Department for Plastic Surgery and Hand Surgery, Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany
| | - Brian Ng
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.,Department of Medicine, Saint Louis University School of Medicine, St. Louis, Missouri, USA
| | - Oliver Darwish
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.,Department of Medicine, California Northstate University College of Medicine, Elk Grove, California, USA
| | - Valentin Haug
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.,Department of Hand, Plastic and Reconstructive Surgery, Microsurgery, Burn Center, BG Trauma Center Ludwigshafen, University of Heidelberg, Ludwigshafen, Germany
| | - Leigh Friedman
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.,Department of Medicine, Lehigh University, Bethlehem, Pennsylvania, USA.,Department of Medicine, Drexel University College of Medicine, Philadelphia, Pennsylvania, USA
| | - Dennis P Orgill
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Adriana C Panayi
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.,Department of Hand, Plastic and Reconstructive Surgery, Microsurgery, Burn Center, BG Trauma Center Ludwigshafen, University of Heidelberg, Ludwigshafen, Germany
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3
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Homer NA, Hanafy MS, Baer SC, Watson AH, Somogyi M, Shore JW, Blaydon S, Durairaj VD, Cui Z, Nakra T. 5-Fluorouracil With Microneedling Modulates Wound Healing in a Murine Model: An Immunohistochemical Analysis of Mechanism and Dose Efficacy. Ophthalmic Plast Reconstr Surg 2022; 38:596-601. [PMID: 35604385 DOI: 10.1097/iop.0000000000002227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE The purpose of this study is to assess the dose-dependent immunohistopathological effects of intradermal microneedle-delivered 5-fluorouracil (5-FU) for postincisional wound healing in a murine model. METHODS A prospective experimental study was performed. Twelve hairless mice were randomized into 4 treatment groups for postincisional wound treatment: microneedling with topical saline, or microneeding with topically-applied 5-FU at concentrations of 25 mg/ml, 50 mg/ml, or 100 mg/ml. Two surgical wounds were created on each animal. Combination wound treatments were performed on postoperative days 14 and 28, and cutaneous biopsies were obtained on day 56. Specimens were analyzed by a dermatopathologist, blinded to the treatment group, for collagen thickness, lymphocytic infiltration, histiocytic response, sub-epidermal basement membrane zone thickness, and myofibroblast density. RESULTS Histopathologic evaluation showed increased collagen thickness, lymphocyte infiltration, and granuloma density in the groups undergoing microneedling treatment with 5-FU, compared to saline. Immunohistochemical analysis revealed a trend toward thicker basement membranes with higher concentrations of 5-FU used, reaching statistical significance between controls and those treated with 100 mg/ml 5-FU ( p = 0.0493). A trend toward decreasing myofibroblast density with increasing doses of 5-FU was noted. No postincisional or treatment complications were observed. CONCLUSIONS Our results demonstrate that microneedling is an effective topical subepithelial drug delivery system, and further suggest a beneficial dose-dependent immunomodulatory effect of 5-FU on intermediate wound healing when used in combination with microneedling. We recommend a 5-FU dose at the mid-range 50 mg/ml concentration to simultaneously maximize efficacy and minimize complication risk.
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Affiliation(s)
- Natalie A Homer
- Division of Ophthalmic Plastic and Orbital Surgery, Department of Ophthalmology, UC Davis Eye Center, Sacramento, California
| | - Mahmoud S Hanafy
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, Austin, Texas
| | | | - Alison H Watson
- Oculoplastic and Orbital Surgery Service, Wills Eye Hospital, Philadelphia, Pennsylvania
| | - Marie Somogyi
- TOC Eye and Face, Austin, Texas
- Department of Ophthalmology, Dell Medical School, The University of Texas at Austin, Austin, Texas
| | - John W Shore
- Department of Ophthalmology, Dell Medical School, The University of Texas at Austin, Austin, Texas
| | - Sean Blaydon
- TOC Eye and Face, Austin, Texas
- Department of Ophthalmology, Dell Medical School, The University of Texas at Austin, Austin, Texas
| | - Vikram D Durairaj
- TOC Eye and Face, Austin, Texas
- Department of Ophthalmology, Dell Medical School, The University of Texas at Austin, Austin, Texas
| | - Zhengrong Cui
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, Austin, Texas
| | - Tanuj Nakra
- TOC Eye and Face, Austin, Texas
- Department of Ophthalmology, Dell Medical School, The University of Texas at Austin, Austin, Texas
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4
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Wound Healing Impairment in Type 2 Diabetes Model of Leptin-Deficient Mice—A Mechanistic Systematic Review. Int J Mol Sci 2022; 23:ijms23158621. [PMID: 35955751 PMCID: PMC9369324 DOI: 10.3390/ijms23158621] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 07/28/2022] [Accepted: 07/29/2022] [Indexed: 02/04/2023] Open
Abstract
Type II diabetes mellitus (T2DM) is one of the most prevalent diseases in the world, associated with diabetic foot ulcers and impaired wound healing. There is an ongoing need for interventions effective in treating these two problems. Pre-clinical studies in this field rely on adequate animal models. However, producing such a model is near-impossible given the complex and multifactorial pathogenesis of T2DM. A leptin-deficient murine model was developed in 1959 and relies on either dysfunctional leptin (ob/ob) or a leptin receptor (db/db). Though monogenic, this model has been used in hundreds of studies, including diabetic wound healing research. In this study, we systematically summarize data from over one hundred studies, which described the mechanisms underlying wound healing impairment in this model. We briefly review the wound healing dynamics, growth factors’ dysregulation, angiogenesis, inflammation, the function of leptin and insulin, the role of advanced glycation end-products, extracellular matrix abnormalities, stem cells’ dysregulation, and the role of non-coding RNAs. Some studies investigated novel chronic diabetes wound models, based on a leptin-deficient murine model, which was also described. We also discussed the interventions studied in vivo, which passed into human clinical trials. It is our hope that this review will help plan future research.
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5
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Peng Z, Nguyen TT, Wang M, Anderson B, Konai MM, Schroeder VA, Wolter WR, Page-Mayberry T, Peterson CE, Mobashery S, Chang M. Proteomics Identification of Targets for Intervention in Pressure Ulcers. ACS Chem Biol 2022; 17:1357-1363. [PMID: 35670779 DOI: 10.1021/acschembio.2c00382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pressure ulcers (PUs) are chronic wounds that lead to amputations and death. Little is known about why PUs are recalcitrant to healing. Wound healing is mediated by matrix metalloproteinases (MMPs). The 24 MMPs in humans each exist in three forms, of which only one is catalytically competent. We analyzed human PU samples using an affinity resin that exclusively binds to the catalytically competent MMPs. We identified by mass spectrometry the active forms of MMP-1, MMP-8, MMP-9, and MMP-14. Concentrations of MMP-8, MMP-9, and MMP-14 were higher in human PUs compared to the healthy tissue, whereas those for MMP-1 did not change. Decreasing levels of active MMP-9 as the PU improved argued for a detrimental role for this enzyme. In a mouse model of PUs, a highly selective inhibitor for MMP-9 and MMP-14, (R)-ND-336, accelerated wound closure in parallel with significant amelioration of ulcer stage. (R)-ND-336 holds promise as a first-in-class treatment for PUs.
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Affiliation(s)
- Zhihong Peng
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Trung T Nguyen
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Man Wang
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Bowen Anderson
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Mohini Mohan Konai
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Valerie A Schroeder
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - William R Wolter
- Freimann Life Sciences Center, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Toni Page-Mayberry
- Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | | | - Shahriar Mobashery
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Mayland Chang
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
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6
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Shibuya Y, Hokugo A, Okawa H, Kondo T, Khalil D, Wang L, Roca Y, Clements A, Sasaki H, Berry E, Nishimura I, Jarrahy R. Therapeutic downregulation of neuronal PAS domain 2 ( Npas2) promotes surgical skin wound healing. eLife 2022; 11:e71074. [PMID: 35040776 PMCID: PMC8789286 DOI: 10.7554/elife.71074] [Citation(s) in RCA: 9] [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: 06/08/2021] [Accepted: 01/14/2022] [Indexed: 11/13/2022] Open
Abstract
Attempts to minimize scarring remain among the most difficult challenges facing surgeons, despite the use of optimal wound closure techniques. Previously, we reported improved healing of dermal excisional wounds in circadian clock neuronal PAS domain 2 (Npas2)-null mice. In this study, we performed high-throughput drug screening to identify a compound that downregulates Npas2 activity. The hit compound (Dwn1) suppressed circadian Npas2 expression, increased murine dermal fibroblast cell migration, and decreased collagen synthesis in vitro. Based on the in vitro results, Dwn1 was topically applied to iatrogenic full-thickness dorsal cutaneous wounds in a murine model. The Dwn1-treated dermal wounds healed faster with favorable mechanical strength and developed less granulation tissue than the controls. The expression of type I collagen, Tgfβ1, and α-smooth muscle actin was significantly decreased in Dwn1-treated wounds, suggesting that hypertrophic scarring and myofibroblast differentiation are attenuated by Dwn1 treatment. NPAS2 may represent an important target for therapeutic approaches to optimal surgical wound management.
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Affiliation(s)
- Yoichiro Shibuya
- Regenerative Bioengineering and Repair Laboratory, Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of MedicineLos AngelesUnited States
- Weintraub Center for Reconstructive BiotechnologyLos AngelesUnited States
- Department of Plastic and Reconstructive Surgery, Faculty of Medicine, University of TsukubaTsukubaJapan
| | - Akishige Hokugo
- Regenerative Bioengineering and Repair Laboratory, Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of MedicineLos AngelesUnited States
- Weintraub Center for Reconstructive BiotechnologyLos AngelesUnited States
| | - Hiroko Okawa
- Weintraub Center for Reconstructive BiotechnologyLos AngelesUnited States
- Division of Molecular and Regenerative Prosthodontics, Tohoku University Graduate School of DentistryMiyagiJapan
| | - Takeru Kondo
- Weintraub Center for Reconstructive BiotechnologyLos AngelesUnited States
- Division of Molecular and Regenerative Prosthodontics, Tohoku University Graduate School of DentistryMiyagiJapan
| | - Daniel Khalil
- Regenerative Bioengineering and Repair Laboratory, Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of MedicineLos AngelesUnited States
| | - Lixin Wang
- Regenerative Bioengineering and Repair Laboratory, Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of MedicineLos AngelesUnited States
| | - Yvonne Roca
- Regenerative Bioengineering and Repair Laboratory, Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of MedicineLos AngelesUnited States
| | - Adam Clements
- Regenerative Bioengineering and Repair Laboratory, Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of MedicineLos AngelesUnited States
| | - Hodaka Sasaki
- Weintraub Center for Reconstructive BiotechnologyLos AngelesUnited States
| | - Ella Berry
- Regenerative Bioengineering and Repair Laboratory, Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of MedicineLos AngelesUnited States
| | - Ichiro Nishimura
- Weintraub Center for Reconstructive BiotechnologyLos AngelesUnited States
| | - Reza Jarrahy
- Regenerative Bioengineering and Repair Laboratory, Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of MedicineLos AngelesUnited States
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7
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D'Amico R, Malucelli C, Uccelli A, Grosso A, Di Maggio N, Briquez PS, Hubbell JA, Wolff T, Gürke L, Mujagic E, Gianni-Barrera R, Banfi A. Therapeutic arteriogenesis by factor-decorated fibrin matrices promotes wound healing in diabetic mice. J Tissue Eng 2022; 13:20417314221119615. [PMID: 36093431 PMCID: PMC9452813 DOI: 10.1177/20417314221119615] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 07/28/2022] [Indexed: 11/16/2022] Open
Abstract
Chronic wounds in type-2 diabetic patients present areas of severe local skin ischemia despite mostly normal blood flow in deeper large arteries. Therefore, restoration of blood perfusion requires the opening of arterial connections from the deep vessels to the superficial skin layer, that is, arteriogenesis. Arteriogenesis is regulated differently from microvascular angiogenesis and is optimally stimulated by high doses of Vascular Endothelial Growth Factor-A (VEGF) together with Platelet-Derived Growth Factor-BB (PDGF-BB). Here we found that fibrin hydrogels decorated with engineered versions of VEGF and PDGF-BB proteins, to ensure protection from degradation and controlled delivery, efficiently accelerated wound closure in diabetic and obese db/db mice, promoting robust microvascular growth and a marked increase in feeding arterioles. Notably, targeting the arteriogenic factors to the intact arterio-venous networks in the dermis around the wound was more effective than the routine treatment of the inflamed wound bed. This approach is readily translatable to a clinical setting.
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Affiliation(s)
- Rosalinda D'Amico
- Cell and Gene Therapy, Department of Biomedicine, Basel University Hospital and University of Basel, Basel, Switzerland.,Vascular Surgery, Department of Surgery, Basel University Hospital and University of Basel, Basel, Switzerland
| | - Camilla Malucelli
- Cell and Gene Therapy, Department of Biomedicine, Basel University Hospital and University of Basel, Basel, Switzerland
| | - Andrea Uccelli
- Cell and Gene Therapy, Department of Biomedicine, Basel University Hospital and University of Basel, Basel, Switzerland
| | - Andrea Grosso
- Cell and Gene Therapy, Department of Biomedicine, Basel University Hospital and University of Basel, Basel, Switzerland
| | - Nunzia Di Maggio
- Cell and Gene Therapy, Department of Biomedicine, Basel University Hospital and University of Basel, Basel, Switzerland
| | - Priscilla S Briquez
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL, USA
| | - Jeffrey A Hubbell
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL, USA
| | - Thomas Wolff
- Vascular Surgery, Department of Surgery, Basel University Hospital and University of Basel, Basel, Switzerland
| | - Lorenz Gürke
- Vascular Surgery, Department of Surgery, Basel University Hospital and University of Basel, Basel, Switzerland
| | - Edin Mujagic
- Vascular Surgery, Department of Surgery, Basel University Hospital and University of Basel, Basel, Switzerland
| | - Roberto Gianni-Barrera
- Cell and Gene Therapy, Department of Biomedicine, Basel University Hospital and University of Basel, Basel, Switzerland
| | - Andrea Banfi
- Cell and Gene Therapy, Department of Biomedicine, Basel University Hospital and University of Basel, Basel, Switzerland.,Vascular Surgery, Department of Surgery, Basel University Hospital and University of Basel, Basel, Switzerland
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8
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Certelli A, Valente P, Uccelli A, Grosso A, Di Maggio N, D'Amico R, Briquez PS, Hubbell JA, Wolff T, Gürke L, Mujagic E, Gianni-Barrera R, Banfi A. Robust Angiogenesis and Arteriogenesis in the Skin of Diabetic Mice by Transient Delivery of Engineered VEGF and PDGF-BB Proteins in Fibrin Hydrogels. Front Bioeng Biotechnol 2021; 9:688467. [PMID: 34277588 PMCID: PMC8281302 DOI: 10.3389/fbioe.2021.688467] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 06/02/2021] [Indexed: 12/20/2022] Open
Abstract
Non-healing ulcers are a serious complication of diabetes mellitus and a major unmet medical need. A major cause for the lack of healing is the impairment of spontaneous vascularization in the skin, despite mostly normal blood flow in deeper large vessels. Therefore, pro-angiogenic treatments are needed to increase therapeutic perfusion by recruiting new arterial connections (therapeutic arteriogenesis). Vascular endothelial growth factor (VEGF) is the master regulator of angiogenesis in physiology and disease, but exploitation of its therapeutic potential requires careful control of its dose distribution in tissue. Co-delivery of platelet derived growth factor-BB (PDGF-BB) has been shown to expand the therapeutic window of VEGF and also improve associated arteriogenesis. We used a highly controlled protein delivery system, based on a clinically applicable fibrin-based platform, to investigate the angiogenic and arteriogenic potential of engineered versions (TG-) of VEGF and PDGF-BB proteins in the skin of diabetic and obese db/db mice. Intradermal delivery of therapeutically relevant doses of TG-VEGF and TG-PDGF-BB induced robust growth of new microvascular networks with similar efficacy as in normal littermate control mice. Further, TG-PDGF-BB prevented the formation of aberrant vascular enlargements by high TG-VEGF levels. As fibrin was degraded after the first week, the induced angiogenesis mostly regressed by 4 weeks, but it promoted effective arteriogenesis in the dermal layer. Therefore, controlled co-delivery of TG-VEGF and TG-PDGF-BB recombinant proteins is effective to induce angiogenesis and arteriogenesis in diabetic mouse skin and should be further investigated to promote diabetic wound healing.
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Affiliation(s)
- Alessandro Certelli
- Cell and Gene Therapy, Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Paolo Valente
- Cell and Gene Therapy, Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland.,Vascular Surgery, Department of Surgery, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Andrea Uccelli
- Cell and Gene Therapy, Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Andrea Grosso
- Cell and Gene Therapy, Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Nunzia Di Maggio
- Cell and Gene Therapy, Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Rosalinda D'Amico
- Cell and Gene Therapy, Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland.,Vascular Surgery, Department of Surgery, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Priscilla S Briquez
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL, United States
| | - Jeffrey A Hubbell
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL, United States
| | - Thomas Wolff
- Vascular Surgery, Department of Surgery, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Lorenz Gürke
- Vascular Surgery, Department of Surgery, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Edin Mujagic
- Vascular Surgery, Department of Surgery, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Roberto Gianni-Barrera
- Cell and Gene Therapy, Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Andrea Banfi
- Cell and Gene Therapy, Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland.,Vascular Surgery, Department of Surgery, University Hospital of Basel, University of Basel, Basel, Switzerland
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9
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Vander Horst MA, Raeman CH, Dalecki D, Hocking DC. Time- and Dose-Dependent Effects of Pulsed Ultrasound on Dermal Repair in Diabetic Mice. ULTRASOUND IN MEDICINE & BIOLOGY 2021; 47:1054-1066. [PMID: 33454160 PMCID: PMC7897308 DOI: 10.1016/j.ultrasmedbio.2020.12.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 12/17/2020] [Accepted: 12/22/2020] [Indexed: 05/15/2023]
Abstract
Chronic wounds, including diabetic, leg and pressure ulcers, impose a significant health care burden worldwide. Some evidence indicates that ultrasound can enhance soft tissue repair. However, therapeutic responses vary among individuals, thereby limiting clinical translation. Here, effects of pulsed ultrasound on dermal wound healing were assessed using a murine model of chronic, diabetic wounds. An ultrasound exposure system was developed to provide daily ultrasound exposures to full-thickness, excisional wounds in genetically diabetic mice. Wounds were exposed to 1 MHz ultrasound (2 ms pulse, 100 Hz pulse repetition frequency, 0-0.4 MPa) for 2 or 3 wk. Granulation tissue thickness and wound re-epithelialization increased as a function of increasing ultrasound pressure amplitude. At 2 wk after injury, significant increases in granulation tissue thickness and epithelial ingrowth were observed in response to 1 MHz pulsed ultrasound at 0.4 MPa. Wounds exposed to 0.4 MPa ultrasound for 3 wk were characterized by collagen-dense, revascularized granulation tissue with a fully restored, mature epithelium. Of note, only half of wounds exposed to 0.4 MPa ultrasound showed significant granulation tissue deposition after 2 wk of treatment. Thus, the db+/db+ mouse model may help to identify biological variables that influence individual responses to pulsed ultrasound and accelerate clinical translation.
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Affiliation(s)
| | - Carol H Raeman
- Department of Biomedical Engineering, University of Rochester, Rochester, New York, USA
| | - Diane Dalecki
- Department of Biomedical Engineering, University of Rochester, Rochester, New York, USA
| | - Denise C Hocking
- Department of Biomedical Engineering, University of Rochester, Rochester, New York, USA; Department of Pharmacology and Physiology, University of Rochester, Rochester, New York, USA.
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10
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Nguyen TT, Jones JI, Wolter WR, Pérez RL, Schroeder VA, Champion MM, Hesek D, Lee M, Suckow MA, Mobashery S, Chang M. Hyperbaric oxygen therapy accelerates wound healing in diabetic mice by decreasing active matrix metalloproteinase‐9. Wound Repair Regen 2019; 28:194-201. [DOI: 10.1111/wrr.12782] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 11/07/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Trung T. Nguyen
- Department of Chemistry and BiochemistryUniversity of Notre Dame Notre Dame Indiana
| | - Jeffrey I. Jones
- Department of Chemistry and BiochemistryUniversity of Notre Dame Notre Dame Indiana
| | - William R. Wolter
- Freimann Life Sciences Center and Department of Biological SciencesUniversity of Notre Dame Notre Dame Indiana
| | - Rocio L. Pérez
- Department of Chemistry and BiochemistryUniversity of Notre Dame Notre Dame Indiana
| | - Valerie A. Schroeder
- Freimann Life Sciences Center and Department of Biological SciencesUniversity of Notre Dame Notre Dame Indiana
| | - Matthew M. Champion
- Department of Chemistry and BiochemistryUniversity of Notre Dame Notre Dame Indiana
| | - Dusan Hesek
- Department of Chemistry and BiochemistryUniversity of Notre Dame Notre Dame Indiana
| | - Mijoon Lee
- Department of Chemistry and BiochemistryUniversity of Notre Dame Notre Dame Indiana
| | - Mark A. Suckow
- Freimann Life Sciences Center and Department of Biological SciencesUniversity of Notre Dame Notre Dame Indiana
- Department of Biomedical EngineeringUniversity of Kentucky Lexington Kentucky
| | - Shahriar Mobashery
- Department of Chemistry and BiochemistryUniversity of Notre Dame Notre Dame Indiana
| | - Mayland Chang
- Department of Chemistry and BiochemistryUniversity of Notre Dame Notre Dame Indiana
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11
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Savina Y, Duflot T, Bounoure F, Kotzki S, Thiebaut PA, Serreau PA, Skiba M, Picquenot JM, Cornic M, Morisseau C, Hammock B, Imbert L, Cracowski JL, Richard V, Roustit M, Bellien J. Impact of the acute local inhibition of soluble epoxide hydrolase on diabetic skin microcirculatory dysfunction. Diab Vasc Dis Res 2019; 16:523-529. [PMID: 31267765 PMCID: PMC7307659 DOI: 10.1177/1479164119860215] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The impact of the local inhibition of soluble epoxide hydrolase, which metabolizes vasodilator and anti-inflammatory epoxyeicosanoids, on diabetic skin microvascular dysfunction was assessed. In diabetic db/db mice, basal skin blood flow assessed using laser Doppler imaging was similar to that of control mice, but thermal hyperemia was markedly reduced. At 2 h after the topical administration of an aqueous gel containing the soluble epoxide hydrolase inhibitor trans-4-[4-(3-adamantan-1-yl-ureido)-cyclohexyloxy]-benzoic acid (t-AUCB: 400 mg/L), the peak concentration of t-AUCB was detected in the skin of diabetic mice, which quickly decreased thereafter. In parallel, 2 h after application of t-AUCB treatment, thermal hyperemia was increased compared to the control gel. Quantification of t-AUCB in plasma of treated animals showed no or low systemic diffusion. Furthermore, haematoxylin and eosin histological staining of skin biopsies showed that skin integrity was preserved in t-AUCB-treated mice. Finally, for pig ear skin, a surrogate for human skin, using Franz diffusion cells, we observed a continuous diffusion of t-AUCB from 2 h after application to beyond 24 h. A single topical administration of a soluble epoxide hydrolase inhibitor improves microcirculatory function in the skin of db/db mice and might represent a new therapeutic approach for preventing the development of skin complications in diabetic patients.
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Affiliation(s)
- Yann Savina
- Université Grenoble Alpes, HP2 UMR INSERM 1042, F-38000, Grenoble, France
- CHU Grenoble Alpes, Pôle Recherche, INSERM CIC1406, F-38000, Grenoble, France
| | - Thomas Duflot
- Department of Pharmacology, Rouen University Hospital, F-76000 Rouen, France
- Laboratory of Pharmacokinetics, Toxicology and Pharmacogenetics, Rouen University Hospital, 76000 Rouen, France
- Normandie Univ, UNIROUEN, INSERM U1096, FHU REMOD-VHF, F-76000 Rouen, France
| | - Frederic Bounoure
- Department of Galenic, Normandy University, UNIROUEN, F-76000 Rouen, France
- INSERM U1239 Normandy University, UNIROUEN, F-76000 Rouen, France
| | - Sylvain Kotzki
- Université Grenoble Alpes, HP2 UMR INSERM 1042, F-38000, Grenoble, France
- CHU Grenoble Alpes, Pôle Recherche, INSERM CIC1406, F-38000, Grenoble, France
| | | | - Pierre-Alex Serreau
- Department of Pharmacology, Rouen University Hospital, F-76000 Rouen, France
- Department of Galenic, Normandy University, UNIROUEN, F-76000 Rouen, France
| | - Mohamed Skiba
- Department of Galenic, Normandy University, UNIROUEN, F-76000 Rouen, France
- INSERM U1239 Normandy University, UNIROUEN, F-76000 Rouen, France
| | | | - Marie Cornic
- Department of Pathology, Henri Becquerel Center, F-76000 Rouen, France
| | | | - Bruce Hammock
- Department of Entomology and Cancer Center, University of California, Davis, CA
| | - Laurent Imbert
- Department of Pharmacology, Rouen University Hospital, F-76000 Rouen, France
- Laboratory of Pharmacokinetics, Toxicology and Pharmacogenetics, Rouen University Hospital, 76000 Rouen, France
- Laboratory of Pharmacokinetics, Toxicology and Pharmacogenetics, Rouen University Hospital, 76000 Rouen, France
| | - Jean-Luc Cracowski
- Université Grenoble Alpes, HP2 UMR INSERM 1042, F-38000, Grenoble, France
- CHU Grenoble Alpes, Pôle Recherche, INSERM CIC1406, F-38000, Grenoble, France
| | - Vincent Richard
- Department of Pharmacology, Rouen University Hospital, F-76000 Rouen, France
- Normandie Univ, UNIROUEN, INSERM U1096, FHU REMOD-VHF, F-76000 Rouen, France
| | - Matthieu Roustit
- Université Grenoble Alpes, HP2 UMR INSERM 1042, F-38000, Grenoble, France
- CHU Grenoble Alpes, Pôle Recherche, INSERM CIC1406, F-38000, Grenoble, France
| | - Jeremy Bellien
- Department of Pharmacology, Rouen University Hospital, F-76000 Rouen, France
- Normandie Univ, UNIROUEN, INSERM U1096, FHU REMOD-VHF, F-76000 Rouen, France
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12
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Lastwika KJ, Dunn CA, Solan JL, Lampe PD. Phosphorylation of connexin 43 at MAPK, PKC or CK1 sites each distinctly alter the kinetics of epidermal wound repair. J Cell Sci 2019; 132:jcs.234633. [PMID: 31427427 DOI: 10.1242/jcs.234633] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 08/12/2019] [Indexed: 12/19/2022] Open
Abstract
The gap junction protein connexin 43 (Cx43) is a key player in wound healing, and inhibitors of Cx43, which speed epidermal wound healing, are currently in clinical trials. Here, we provide direct in vivo evidence that specific phosphorylation events on Cx43 change the physiological response during wound healing. Blocking phosphorylation, through mutation of serine residues in Cx43 at the protein kinase C (PKC) or casein kinase 1 (CK1) sites, significantly slowed the rate of wound closure in vivo and in vitro and resulted in a thicker epidermal layer after reepithelialization. Conversely, preventing Cx43 phosphorylation by mitogen-activated protein kinases (MAPKs) through mutation significantly increased the rate of wound closure in vivo Defects in migration, but not proliferation, in all mutants were partially rescued in vitro by changing serine residues to aspartic or glutamic acid. These data prove that specific Cx43 phosphorylation events play an important role at different stages of wound healing. Thus, a clear physiological understanding of the spatiotemporal regulation of kinase activation and consequent effects on gap junctions could lead to a more targeted approach to modulating Cx43 expression during wound healing.
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Affiliation(s)
- Kristin J Lastwika
- Translational Research Program, Public Health Sciences and Human Biology Divisions, Fred Hutchinson Cancer Research Center Seattle, WA 98109, USA
| | - Clarence A Dunn
- Translational Research Program, Public Health Sciences and Human Biology Divisions, Fred Hutchinson Cancer Research Center Seattle, WA 98109, USA
| | - Joell L Solan
- Translational Research Program, Public Health Sciences and Human Biology Divisions, Fred Hutchinson Cancer Research Center Seattle, WA 98109, USA
| | - Paul D Lampe
- Translational Research Program, Public Health Sciences and Human Biology Divisions, Fred Hutchinson Cancer Research Center Seattle, WA 98109, USA
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13
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Wang XT, McKeever CC, Vonu P, Patterson C, Liu PY. Dynamic Histological Events and Molecular Changes in Excisional Wound Healing of Diabetic DB/DB Mice. J Surg Res 2019; 238:186-197. [DOI: 10.1016/j.jss.2019.01.048] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 12/18/2018] [Accepted: 01/17/2019] [Indexed: 01/08/2023]
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14
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The heparin binding domain of von Willebrand factor binds to growth factors and promotes angiogenesis in wound healing. Blood 2019; 133:2559-2569. [PMID: 30975637 DOI: 10.1182/blood.2019000510] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 04/04/2019] [Indexed: 12/23/2022] Open
Abstract
During wound healing, the distribution, availability, and signaling of growth factors (GFs) are orchestrated by their binding to extracellular matrix components in the wound microenvironment. Extracellular matrix proteins have been shown to modulate angiogenesis and promote wound healing through GF binding. The hemostatic protein von Willebrand factor (VWF) released by endothelial cells (ECs) in plasma and in the subendothelial matrix has been shown to regulate angiogenesis; this function is relevant to patients in whom VWF deficiency or dysfunction is associated with vascular malformations. Here, we show that VWF deficiency in mice causes delayed wound healing accompanied by decreased angiogenesis and decreased amounts of angiogenic GFs in the wound. We show that in vitro VWF binds to several GFs, including vascular endothelial growth factor-A (VEGF-A) isoforms and platelet-derived growth factor-BB (PDGF-BB), mainly through the heparin-binding domain (HBD) within the VWF A1 domain. VWF also binds to VEGF-A and fibroblast growth factor-2 (FGF-2) in human plasma and colocalizes with VEGF-A in ECs. Incorporation of the VWF A1 HBD into fibrin matrices enables sequestration and slow release of incorporated GFs. In vivo, VWF A1 HBD-functionalized fibrin matrices increased angiogenesis and GF retention in VWF-deficient mice. Treatment of chronic skin wounds in diabetic mice with VEGF-A165 and PDGF-BB incorporated within VWF A1 HBD-functionalized fibrin matrices accelerated wound healing, with increased angiogenesis and smooth muscle cell proliferation. Therefore, the VWF A1 HBD can function as a GF reservoir, leading to effective angiogenesis and tissue regeneration.
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15
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Kasiewicz LN, Whitehead KA. Lipid nanoparticles silence tumor necrosis factor α to improve wound healing in diabetic mice. Bioeng Transl Med 2019; 4:75-82. [PMID: 30680320 PMCID: PMC6336737 DOI: 10.1002/btm2.10123] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 11/11/2018] [Accepted: 11/19/2018] [Indexed: 12/13/2022] Open
Abstract
Diabetes mellitus is a mounting concern in the United States, as are the mortality and morbidity that result from its complications. Of particular concern, diabetes patients frequently suffer from impaired wound healing and resultant nonhealing diabetic foot ulcers. These ulcers overproduce tumor necrosis factor α (TNFα), which reduces wound bed cell migration and proliferation while encouraging apoptosis. Herein, we describe the use of siRNA-loaded lipid nanoparticles (LNPs) as a potential wound treatment to combat an overzealous immune response and facilitate wound closure. LNPs were formulated with an ionizable, degradable lipidoid and siRNA specific for TNFα. Topical application of nanoparticles reduced TNFα mRNA expression in the wound by 40-55% in diabetic and nondiabetic mice. In diabetic mice, this TNFα knockdown accelerated wound healing compared to untreated controls. Together, these results serve as proof-of-concept that RNA interference therapy using LNPs can reduce the severity and duration of chronic diabetic wounds.
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Affiliation(s)
- Lisa N. Kasiewicz
- Dept. of Chemical EngineeringCarnegie Mellon University5000 Forbes Avenue, PittsburghPA15213
| | - Kathryn A. Whitehead
- Dept. of Chemical EngineeringCarnegie Mellon University5000 Forbes Avenue, PittsburghPA15213
- Dept. of Biomedical EngineeringCarnegie Mellon University5000 Forbes Avenue, PittsburghPA15213
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Gallant-Behm CL, Piper J, Dickinson BA, Dalby CM, Pestano LA, Jackson AL. A synthetic microRNA-92a inhibitor (MRG-110) accelerates angiogenesis and wound healing in diabetic and nondiabetic wounds. Wound Repair Regen 2018; 26:311-323. [PMID: 30118158 DOI: 10.1111/wrr.12660] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 07/04/2018] [Indexed: 12/17/2022]
Abstract
There is a strong unmet need for new therapeutics to accelerate wound healing across both chronic and acute indications. It is well established that local tissue hypoxia, vascular insufficiency, and/or insufficient angiogenesis contribute to inadequate wound repair in the context of diabetic foot ulcers as well as to other chronic wounds such as venous stasis and pressure ulcers. microRNA-92a-3p (miR-92a) is a potent antiangiogenic miRNA whose inhibition has led to increases in angiogenesis in multiple organ systems, resulting in an improvement in function following myocardial infarction, limb ischemia, vascular injury, and bone fracture. Due to their pro-angiogenic effects, miR-92a inhibitors offer potential therapeutics to accelerate the healing process in cutaneous wounds as well. This study investigated the effect of a development stage locked nucleic acid-modified miR-92a inhibitor, MRG-110, in excisional wounds in db/db mice and in normal pigs. In both acute and chronic wounds, MRG-110 increased granulation tissue formation as assessed by histology, angiogenesis as assessed by immunohistochemistry and tissue perfusion, and wound healing as measured by time to closure and percent closure over time. The effects of MRG-110 were greater than those that were observed with the positive controls rhVEGF-165 and rhPDGF-BB, and MRG-110 was at least additive with rhPDGF-BB when co-administered in db/db mouse wounds. MRG-110 was found to up-regulate expression of the pro-angiogenic miR-92a target gene integrin alpha 5 in vitro in both human vascular endothelial cells and primary human skin fibroblasts and in vivo in mouse skin, demonstrating its on-target effects in vitro and in vivo. Additional safety endpoints were assessed in both the mouse and pig studies with no safety concerns noted. These studies suggest that MRG-110 has the potential to accelerate both chronic and acute wound healing and these data provide support for future clinical trials of MRG-110.
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17
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Nguyen TT, Ding D, Wolter WR, Pérez RL, Champion MM, Mahasenan KV, Hesek D, Lee M, Schroeder VA, Jones JI, Lastochkin E, Rose MK, Peterson CE, Suckow MA, Mobashery S, Chang M. Validation of Matrix Metalloproteinase-9 (MMP-9) as a Novel Target for Treatment of Diabetic Foot Ulcers in Humans and Discovery of a Potent and Selective Small-Molecule MMP-9 Inhibitor That Accelerates Healing. J Med Chem 2018; 61:8825-8837. [DOI: 10.1021/acs.jmedchem.8b01005] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Trung T. Nguyen
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Derong Ding
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - William R. Wolter
- Freimann Life Sciences Center and Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Rocio L. Pérez
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Matthew M. Champion
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Kiran V. Mahasenan
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Dusan Hesek
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Mijoon Lee
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Valerie A. Schroeder
- Freimann Life Sciences Center and Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Jeffrey I. Jones
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Elena Lastochkin
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Margaret K. Rose
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Charles E. Peterson
- Center for Wound Healing, Elkhart General Hospital, Elkhart, Indiana 46514, United States
| | - Mark A. Suckow
- Freimann Life Sciences Center and Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Shahriar Mobashery
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Mayland Chang
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
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18
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Nguyen TT, Ding D, Wolter WR, Champion MM, Hesek D, Lee M, Pérez RL, Schroeder VA, Suckow MA, Mobashery S, Chang M. Expression of active matrix metalloproteinase-9 as a likely contributor to the clinical failure of aclerastide in treatment of diabetic foot ulcers. Eur J Pharmacol 2018; 834:77-83. [PMID: 30012502 PMCID: PMC6205151 DOI: 10.1016/j.ejphar.2018.07.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 07/05/2018] [Accepted: 07/12/2018] [Indexed: 01/13/2023]
Abstract
Chronic wounds are a complication of diabetes. Treatment for diabetic foot ulcers is complex with little clinical recourse, resulting in 108,000 lower-limb amputations annually in the United States alone. Matrix metalloproteinases (MMPs) play important roles in the pathology and in the repair of chronic wounds. We previously identified active MMP-8 and MMP-9 in wounds of diabetic mice and determined that MMP-8 accelerates wound repair, while MMP-9 is the culprit for the diabetic wound being refractory to healing. Aclerastide, a peptide analog of angiotensin II, recently failed in phase III clinical trials for treatment of diabetic foot ulcers. We demonstrate herein that treatment of wounds of diabetic mice with aclerastide results in elevated levels of reactive oxygen species and of active MMP-9, which is likely an important contributor to the failure of aclerastide in clinical trials.
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Affiliation(s)
- Trung T Nguyen
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA
| | - Derong Ding
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA
| | - William R Wolter
- Freimann Life Sciences Center and Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, USA
| | - Matthew M Champion
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA
| | - Dusan Hesek
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA
| | - Mijoon Lee
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA
| | - Rocio L Pérez
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA
| | - Valerie A Schroeder
- Freimann Life Sciences Center and Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, USA
| | - Mark A Suckow
- Freimann Life Sciences Center and Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, USA
| | - Shahriar Mobashery
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA
| | - Mayland Chang
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA.
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19
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Deegan AJ, Wang W, Men S, Li Y, Song S, Xu J, Wang RK. Optical coherence tomography angiography monitors human cutaneous wound healing over time. Quant Imaging Med Surg 2018; 8:135-150. [PMID: 29675355 DOI: 10.21037/qims.2018.02.07] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Background In vivo imaging of the complex cascade of events known to be pivotal elements in the healing of cutaneous wounds is a difficult but essential task. Current techniques are highly invasive, or lack the level of vascular and structural detail required for accurate evaluation, monitoring and treatment. We aimed to use an advanced optical coherence tomography (OCT)-based angiography (OCTA) technique for the non-invasive, high resolution imaging of cutaneous wound healing. Methods We used a clinical prototype OCTA to image, identify and track key vascular and structural adaptations known to occur throughout the healing process. Specific vascular parameters, such as diameter and density, were measured to aid our interpretations under a spatiotemporal framework. Results We identified multiple distinct, yet overlapping stages, hemostasis, inflammation, proliferation, and remodeling, and demonstrated the detailed vascularization and anatomical attributes underlying the multifactorial processes of dermatologic wound healing. Conclusions OCTA provides an opportunity to both qualitatively and quantitatively assess the vascular response to acute cutaneous damage and in the future, may help to ascertain wound severity and possible healing outcomes; thus, enabling more effective treatment options.
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Affiliation(s)
- Anthony J Deegan
- Department of Bioengineering, University of Washington, Seattle, Washington, USA
| | - Wendy Wang
- Department of Bioengineering, University of Washington, Seattle, Washington, USA
| | - Shaojie Men
- Department of Bioengineering, University of Washington, Seattle, Washington, USA
| | - Yuandong Li
- Department of Bioengineering, University of Washington, Seattle, Washington, USA
| | - Shaozhen Song
- Department of Bioengineering, University of Washington, Seattle, Washington, USA
| | - Jingjiang Xu
- Department of Bioengineering, University of Washington, Seattle, Washington, USA
| | - Ruikang K Wang
- Department of Bioengineering, University of Washington, Seattle, Washington, USA.,Department of Ophthalmology, University of Washington, Seattle, Washington, USA
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20
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Neuropeptides, Inflammation, and Diabetic Wound Healing: Lessons from Experimental Models and Human Subjects. CONTEMPORARY DIABETES 2018. [DOI: 10.1007/978-3-319-89869-8_8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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21
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Comparison of In-Vitro and Ex-Vivo Wound Healing Assays for the Investigation of Diabetic Wound Healing and Demonstration of a Beneficial Effect of a Triterpene Extract. PLoS One 2017; 12:e0169028. [PMID: 28046026 PMCID: PMC5207624 DOI: 10.1371/journal.pone.0169028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 12/09/2016] [Indexed: 11/24/2022] Open
Abstract
Diabetes mellitus is a frequent cause for chronic, difficult-to-treat wounds. New therapies for diabetic wounds are urgently needed and in-vitro or ex-vivo test systems are essential for the initial identification of new active molecules. The aim of this study is to compare in-vitro and ex-vivo test systems for their usability for early drug screening and to investigate the efficacy of a birch bark triterpene extract (TE) that has been proven ex-vivo and clinically to accelerate non-diabetic wound healing (WH), in a diabetic context. We investigated in-vitro models for diabetic WH, i.e. scratch assays with human keratinocytes from diabetic donors or cultured under hyperglycaemic conditions and a newly developed porcine ex-vivo hyperglycaemic WH model for their potential to mimic delayed diabetic WH and for the influence of TE in these test systems. We show that keratinocytes from diabetic donors often fail to exhibit significantly delayed WH. For cells under hyperglycaemic conditions significant decrease is observed but is influenced by choice of medium and presence of supplements. Also, donor age plays a role. Interestingly, hyperglycaemic effects are mainly hyperosmolaric effects in scratch assays. Ex-vivo models under hyperglycaemic conditions show a clear and substantial decrease of WH, and here both glucose and hyperosmolarity effects are involved. Finally, we provide evidence that TE is also beneficial for ex-vivo hyperglycaemic WH, resulting in significantly increased length of regenerated epidermis to 188±16% and 183±11% (SEM; p<0.05) compared to controls when using two different TE formulations. In conclusion, our results suggest that microenvironmental influences are important in WH test systems and that therefore the more complex hyperglycaemic ex-vivo model is more suitable for early drug screening. Limitations of the in-vitro and ex-vivo models are discussed. Furthermore our data recommend TE as a promising candidate for in-vivo testings in diabetic wounds.
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22
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Complementary Effects of Negative-Pressure Wound Therapy and Pulsed Radiofrequency Energy on Cutaneous Wound Healing in Diabetic Mice. Plast Reconstr Surg 2017; 139:105-117. [DOI: 10.1097/prs.0000000000002909] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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23
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Pereira LDP, Mota MRL, Brizeno LAC, Nogueira FC, Ferreira EGM, Pereira MG, Assreuy AMS. Modulator effect of a polysaccharide-rich extract from Caesalpinia ferrea stem barks in rat cutaneous wound healing: Role of TNF-α, IL-1β, NO, TGF-β. JOURNAL OF ETHNOPHARMACOLOGY 2016; 187:213-223. [PMID: 27125588 DOI: 10.1016/j.jep.2016.04.043] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 04/14/2016] [Accepted: 04/24/2016] [Indexed: 06/05/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE In folk medicine stem barks of Caesalpinia ferrea (Caesalpinioideae) are used to treat enterocolitis, rheumatism and wounds and in experimental procedures, its aqueous extracts demonstrated antiulcer, anti-inflammatory, analgesic, and healing effects. AIM OF THE STUDY The healing mechanism of the polyssacharide-rich extract of C. ferrea stem barks (TPL-Cf) was investigated in a model of excisional cutaneous wound in Wistar rats. MATERIALS AND METHODS Excisional wounds received topical treatment with TPL-Cf (0.025-0.1%) during 21 days. Hypernociception, macroscopical, histological and immunohistochemical parameters were evaluated and analyzed by ANOVA, Bonferroni and Kruskal-Wallis tests, followed by Dunn and Chi-Square tests. RESULTS TPL-Cf (0.1%) reduced wound area and hypernociception, and increased wound contraction. TPL-Cf reduced leukocyte infiltration and vascular permeability, and stimulated fibroblasia, angiogenesis, well formed granulation tissue, collagen deposition and epithelial layer formation. TPL-Cf reduced TNF-α expression and the levels of PGE2 (73%-day 5), IL-1 (42%-day 2), MDA (38%-day 5), total protein (53%-day 2; 73%-day 5) and MPO activity (53%-day 2), but increased the expression of i-NOS (days 5 and 7), TGF-β (day 5) and the levels of NO (3.6 fold-day 5). CONCLUSION The polysaccharide-rich extract of C. ferra stem barks accelerates wound healing by the control of the inflammatory phase and attenuates hypernociception via modulation of inflammatory mediators (TNF-α, IL-1β, NO, TGF-β).
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Affiliation(s)
- Lívia de P Pereira
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Av. Dr. Silas Munguba 1700, 60740-000 Fortaleza-CE, Brazil
| | - Mario R L Mota
- Faculdade de Farmácia, Odontologia e Enfermagem, Universidade Federal do Ceará, Rua Alexandre Baraúna 949, 60430-160 Fortaleza-CE, Brazil
| | - Luiz A C Brizeno
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Av. Dr. Silas Munguba 1700, 60740-000 Fortaleza-CE, Brazil
| | - Francisca C Nogueira
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Av. Dr. Silas Munguba 1700, 60740-000 Fortaleza-CE, Brazil; Faculdade de Educação, Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, Rua José de Queiroz 2554, 63900-000 Quixadá-CE, Brazil
| | - Elda G M Ferreira
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Av. Dr. Silas Munguba 1700, 60740-000 Fortaleza-CE, Brazil
| | - Maria G Pereira
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Av. Dr. Silas Munguba 1700, 60740-000 Fortaleza-CE, Brazil; Faculdade de Educação, Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, Rua José de Queiroz 2554, 63900-000 Quixadá-CE, Brazil
| | - Ana M S Assreuy
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Av. Dr. Silas Munguba 1700, 60740-000 Fortaleza-CE, Brazil.
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Vigneswaran Y, Han H, De Loera R, Wen Y, Zhang X, Sun T, Mora-Solano C, Collier JH. This paper is the winner of an SFB Award in the Hospital Intern, Residency category: Peptide biomaterials raising adaptive immune responses in wound healing contexts. J Biomed Mater Res A 2016; 104:1853-62. [PMID: 27129604 DOI: 10.1002/jbm.a.35767] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Accepted: 04/28/2016] [Indexed: 12/14/2022]
Abstract
Biomaterials used in the context of tissue engineering or wound repair are commonly designed to be "nonimmunogenic." However, previously it has been observed that self-assembled peptide nanofiber materials are noninflammatory despite their immunogenicity, suggesting that they may be appropriate for use in wound-healing contexts. To test this hypothesis, mice were immunized with epitope-containing peptide self-assemblies until they maintained high antibody titers against the material, then gels of the same peptide assemblies were applied within full-thickness dermal wounds. In three different murine dermal-wounding models with different baseline healing rates, even significantly immunogenic peptide assemblies did not delay healing. Conversely, adjuvanted peptide assemblies, while raising similar antibody titers to unadjuvanted assemblies, did delay wound healing. Analysis of the healing wounds indicated that compared to adjuvanted peptide assemblies, the unadjuvanted assemblies exhibited a progression of the dominant T-cell subset from CD4(+) to CD8(+) cells in the wound, and CD4(+) cell populations displayed a more Th2-slanted response. These findings illustrate an example of a significant antibiomaterial adaptive immune response that does not adversely affect wound healing despite ongoing antibody production. This material would thus be considered "immunologically compatible" in this specific context rather than "nonimmunogenic," a designation that is expected to apply to a range of other protein- and peptide-based biomaterials in wound-healing and tissue-engineering applications. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 104A: 1853-1862, 2016.
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Affiliation(s)
| | - Huifang Han
- Department of Surgery, University of Chicago, Chicago, Illinois
| | | | - Yi Wen
- Department of Surgery, University of Chicago, Chicago, Illinois.,Department of Biomedical Engineering, Duke University, Durham, North Carolina
| | - Xing Zhang
- Department of Surgery, University of Chicago, Chicago, Illinois
| | - Tao Sun
- Department of Surgery, University of Chicago, Chicago, Illinois
| | | | - Joel H Collier
- Department of Surgery, University of Chicago, Chicago, Illinois.,Department of Biomedical Engineering, Duke University, Durham, North Carolina
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25
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Park SA, Covert J, Teixeira L, Motta MJ, DeRemer SL, Abbott NL, Dubielzig R, Schurr M, Isseroff RR, McAnulty JF, Murphy CJ. Importance of defining experimental conditions in a mouse excisional wound model. Wound Repair Regen 2016; 23:251-61. [PMID: 25703258 DOI: 10.1111/wrr.12272] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2014] [Revised: 02/06/2015] [Accepted: 02/10/2015] [Indexed: 11/29/2022]
Abstract
The murine dorsum dermal excisional wound model has been widely utilized with or without splint application. However, variations in experimental methods create challenges for direct comparison of results provided in the literature and for design of new wound healing studies. Here, we investigated the effects of wound location and size, number of wounds, type of adhesive used for splint fixation on wound healing using splinted or unsplinted dorsum excisional full thickness wound models. One or two 6- or 8-mm full thickness wounds were made with or without splinting in genetically diabetic but heterozygous mice (Dock7(m) + / + Lepr(db) ). Two different adhesives: tissue adhesive and an over the counter cyanoacrylate adhesive (OTCA) "Krazy glue" were used to fix splints. Wound contraction, wound closure, and histopathological parameters including reepithelialization, collagen deposition and inflammation were compared between groups. No significant effect of wound number (1 vs. 2), side (left vs. right and cranial vs. caudal) or size on wound healing was observed. The OTCA group had a significantly higher splint success compared to the tissue adhesive group that resulted in significantly higher reepithelialization and collagen deposition in the OTCA group. Understanding the outcomes and effects of the variables will help investigators choose appropriate experimental conditions for the study purpose and interpret data.
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Affiliation(s)
- Shin Ae Park
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, California
| | - Jill Covert
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, California
| | - Leandro Teixeira
- Department of Pathobiological Sciences School of Veterinary Medicine, University of Wisconsin, Madison, Wisconsin
| | - Monica J Motta
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, California
| | - Sara L DeRemer
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, California
| | - Nicholas L Abbott
- Department of Chemical and Biological Engineering, University of Wisconsin, Madison, Wisconsin
| | - Richard Dubielzig
- Department of Pathobiological Sciences School of Veterinary Medicine, University of Wisconsin, Madison, Wisconsin
| | - Michael Schurr
- Trauma Surgery, Mission Medical Associates, Mission Hospital, Asheville, North Carolina
| | - Roslyn Rivkah Isseroff
- Department of Dermatology, School of Medicine, University of California, Davis, California.,Dermatology Service, VA Northern California Health Care System, Mather, California
| | - Jonathan F McAnulty
- Department of Chemical and Biological Engineering, University of Wisconsin, Madison, Wisconsin.,Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, Wisconsin
| | - Christopher J Murphy
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, California.,Department of Ophthalmology & Vision Science, School of Medicine, University of California, Davis, California
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26
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Gunn JS, Bakaletz LO, Wozniak DJ. What's on the Outside Matters: The Role of the Extracellular Polymeric Substance of Gram-negative Biofilms in Evading Host Immunity and as a Target for Therapeutic Intervention. J Biol Chem 2016; 291:12538-12546. [PMID: 27129225 DOI: 10.1074/jbc.r115.707547] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Biofilms are organized multicellular communities encased in an extracellular polymeric substance (EPS). Biofilm-resident bacteria resist immunity and antimicrobials. The EPS provides structural stability and presents a barrier; however, a complete understanding of how EPS structure relates to biological function is lacking. This review focuses on the EPS of three Gram-negative pathogens: Pseudomonas aeruginosa, nontypeable Haemophilus influenzae, and Salmonella enterica serovar Typhi/Typhimurium. Although EPS proteins and polysaccharides are diverse, common constituents include extracellular DNA, DNABII (DNA binding and bending) proteins, pili, flagella, and outer membrane vesicles. The EPS biochemistry promotes recalcitrance and informs the design of therapies to reduce or eliminate biofilm burden.
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Affiliation(s)
- John S Gunn
- Department of Microbial Infection and Immunity, Ohio State University, Columbus, Ohio 43210; Center for Microbial Interface Biology, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio 43205
| | - Lauren O Bakaletz
- Department of Microbial Infection and Immunity, Ohio State University, Columbus, Ohio 43210; Center for Microbial Interface Biology, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio 43205; Departments of Pediatrics and Otolaryngology, The Research Institute at Nationwide Children's Hospital and Ohio State University, Columbus, Ohio 43210
| | - Daniel J Wozniak
- Department of Microbial Infection and Immunity, Ohio State University, Columbus, Ohio 43210; Center for Microbial Interface Biology, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio 43205; Department of Microbiology, Ohio State University, Columbus, Ohio 43210.
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27
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Castleberry SA, Almquist BD, Li W, Reis T, Chow J, Mayner S, Hammond PT. Self-Assembled Wound Dressings Silence MMP-9 and Improve Diabetic Wound Healing In Vivo. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:1809-17. [PMID: 26695434 DOI: 10.1002/adma.201503565] [Citation(s) in RCA: 135] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 11/13/2015] [Indexed: 05/24/2023]
Abstract
The direct local delivery of short interfering RNA (siRNA) into target tissues presents a real solution to several complex medical conditions that today lack efficacious therapies. The development of an ultrathin polymer coating is described to sustain the delivery of siRNA for up to 2 weeks in vitro and in vivo. This technology successfully reduces the expression of MMP-9 within the wounds of diabetic mice, significantly accelerating the wound healing process and improving the quality of tissue formed.
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Affiliation(s)
- Steven A Castleberry
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Koch Institute of Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, 02139, USA
| | - Benjamin D Almquist
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Koch Institute of Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Wei Li
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Koch Institute of Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Tiago Reis
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - John Chow
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Sarah Mayner
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Paula T Hammond
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Koch Institute of Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
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28
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Icli B, Nabzdyk CS, Lujan-Hernandez J, Cahill M, Auster ME, Wara AKM, Sun X, Ozdemir D, Giatsidis G, Orgill DP, Feinberg MW. Regulation of impaired angiogenesis in diabetic dermal wound healing by microRNA-26a. J Mol Cell Cardiol 2016; 91:151-9. [PMID: 26776318 DOI: 10.1016/j.yjmcc.2016.01.007] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 01/04/2016] [Accepted: 01/06/2016] [Indexed: 12/15/2022]
Abstract
Wound healing is a physiological reparative response to injury and a well-orchestrated process that involves hemostasis, cellular migration, proliferation, angiogenesis, extracellular matrix deposition, and wound contraction and re-epithelialization. However, patients with type 2 diabetes mellitus (T2D) are frequently afflicted with impaired wound healing that progresses into chronic wounds or diabetic ulcers, and may lead to complications including limb amputation. Herein, we investigate the potential role of microRNA-26a (miR-26a) in a diabetic model of wound healing. Expression of miR-26a is rapidly induced in response to high glucose in endothelial cells (ECs). Punch skin biopsy wounding of db/db mice revealed increased expression of miR-26a (~3.5-fold) four days post-wounding compared to that of WT mice. Local administration of a miR-26a inhibitor, LNA-anti-miR-26a, induced angiogenesis (up to ~80%), increased granulation tissue thickness (by 2.5-fold) and accelerated wound closure (53% after nine days) compared to scrambled anti-miR controls in db/db mice. These effects were independent of altered M1/M2 macrophage ratios. Mechanistically, inhibition of miR-26a increased its target gene SMAD1 in ECs nine days post-wounding of diabetic mice. In addition, high glucose reduced activity of the SMAD1-3'-UTR. Diabetic dermal wounds treated with LNA-anti-miR-26a had increased expression of ID1, a downstream modulator or SMAD1, and decreased expression of the cell cycle inhibitor p27. These findings establish miR-26a as an important regulator on the progression of skin wounds of diabetic mice by specifically regulating the angiogenic response after injury, and demonstrate that neutralization of miR-26a may serve as a novel approach for therapy.
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Affiliation(s)
- Basak Icli
- Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States
| | - Christoph S Nabzdyk
- Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States
| | - Jorge Lujan-Hernandez
- Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States
| | - Meghan Cahill
- Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States
| | - Michael E Auster
- Department of Surgery, Beth Israel Deaconess Medical Center, Boston, MA 02215, United States
| | - A K M Wara
- Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States
| | - Xinghui Sun
- Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States
| | - Denizhan Ozdemir
- Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States
| | - Giorgio Giatsidis
- Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States
| | - Dennis P Orgill
- Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States
| | - Mark W Feinberg
- Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States.
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29
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Fong CY, Tam K, Cheyyatraivendran S, Gan SU, Gauthaman K, Armugam A, Jeyaseelan K, Choolani M, Biswas A, Bongso A. Human Wharton's jelly stem cells and its conditioned medium enhance healing of excisional and diabetic wounds. J Cell Biochem 2014; 115:290-302. [PMID: 24038311 DOI: 10.1002/jcb.24661] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Accepted: 08/20/2013] [Indexed: 12/21/2022]
Abstract
Wound healing is a major problem in diabetic patients and current treatments have met with limited success. We evaluated the treatment of excisional and diabetic wounds using a stem cell isolated from the human umbilical cord Wharton's jelly (hWJSC) that shares unique properties with embryonic and adult mesenchymal stem cells. hWJSCs are non-controversial, available in abundance, hypo-immunogenic, non-tumorigenic, differentiate into keratinocytes, and secrete important molecules for tissue repair. When human skin fibroblasts (CCD) in conventional scratch-wound assays were exposed to hWJSC-conditioned medium (hWJSC-CM) the fibroblasts at the wound edges migrated and completely covered the spaces by day 2 compared to controls. The number of invaded cells, cell viability, total collagen, elastin, and fibronectin levels were significantly greater in the hWJSC-CM treatment arm compared to controls (P < 0.05). When a single application of green fluorescent protein (GFP)-labeled hWJSCs (GFP-hWJSCs) or hWJSC-CM was administered to full-thickness murine excisional and diabetic wounds, healing rates were significantly greater compared to controls (P < 0.05). Wound biopsies collected at various time points showed the presence of green GFP-labeled hWJSCs, positive human keratinocyte markers (cytokeratin, involucrin, filaggrin) and expression of ICAM-1, TIMP-1, and VEGF-A. On histology, the GFP-hWJSCs and hWJSC-CM treated wounds showed reepithelialization, increased vascularity and cellular density and increased sebaceous gland and hair follicle numbers compared to controls. hWJSCs showed increased expression of several miRNAs associated with wound healing compared to CCDs. Our studies demonstrated that hWJSCs enhance healing of excisional and diabetic wounds via differentiation into keratinocytes and release of important molecules.
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Affiliation(s)
- Chui-Yee Fong
- Department of Obstetrics and Gynaecology, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, Singapore, 119228, Singapore
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30
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Immonen JA, Zagon IS, McLaughlin PJ. Topical Naltrexone as Treatment for Type 2 Diabetic Cutaneous Wounds. Adv Wound Care (New Rochelle) 2014; 3:419-427. [PMID: 24940556 PMCID: PMC4048970 DOI: 10.1089/wound.2014.0543] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Accepted: 04/09/2014] [Indexed: 11/13/2022] Open
Abstract
Objective: Type 2 diabetes (T2D) is associated with impaired cutaneous wound healing and can result in ulceration, infection, and/or amputation. More than 25 million people in the United States have T2D and are vulnerable to epithelial-related complications. Current therapies are limited in their efficacy. New treatments for full-thickness cutaneous wounds that focus on underlying diabetic pathways are needed. Approach: Topical application of the opioid receptor antagonist naltrexone (NTX) dissolved in cream reverses delayed wound closure in type 1 diabetic rat by the acceleration of reepithelialization and enhancement of angiogenesis and remodeling. NTX blocks the opioid growth factor (OGF)-OGF receptor (OGFr) axis and upregulates DNA synthesis and cell proliferation. To investigate whether NTX is an effective therapy for T2D wound closure, genetically obese mice (db/db) and normal C57Bl/6J mice received full-thickness cutaneous wounds. Wounds (5 mm in diameter) were treated topically three times daily with 10-5 M NTX or sterile saline dissolved in cream and photographed every 2 days. Results: Wounds in db/db mice treated with saline were 11-92% larger than those in normal mice throughout the 2-week observation. Topical NTX therapy in T2D mice reduced the residual wound size by 13-30% between days 8 and 14 relative to diabetic mice receiving saline. Reepithelialization and DNA synthesis, as analyzed by epithelial thickness and BrdU labeling indexes, respectively, were accelerated in NTX-treated wounds. Innovation and Conclusion: These data suggest that the OGF-OGFr axis plays a role in epithelial-related complications of T2D and that blockade of this pathway by NTX may be an effective treatment for wound repair.
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Affiliation(s)
- Jessica A. Immonen
- Department of Neural and Behavioral Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
| | - Ian S. Zagon
- Department of Neural and Behavioral Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
| | - Patricia J. McLaughlin
- Department of Neural and Behavioral Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
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31
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Park SA, Teixeira LBC, Raghunathan VK, Covert J, Dubielzig RR, Isseroff RR, Schurr M, Abbott NL, McAnulty J, Murphy CJ. Full-thickness splinted skin wound healing models in db/db and heterozygous mice: Implications for wound healing impairment. Wound Repair Regen 2014; 22:368-80. [DOI: 10.1111/wrr.12172] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Accepted: 02/27/2014] [Indexed: 01/13/2023]
Affiliation(s)
- Shin Ae Park
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine; University of California; Davis California
| | | | - Vijay Krishna Raghunathan
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine; University of California; Davis California
| | - Jill Covert
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine; University of California; Davis California
| | - Richard R. Dubielzig
- Department of Pathobiological Sciences; University of Wisconsin; Madison Wisconsin
| | - Roslyn Rivkah Isseroff
- Department of Dermatology; University of California; Davis California
- VA Northern California Health Care System; Mather California
| | - Michael Schurr
- Department of Surgery; University of Colorado; Denver Colorado
| | - Nicholas L. Abbott
- Department of Chemical and Biological Engineering; University of Wisconsin; Madison Wisconsin
| | - Jonathan McAnulty
- Department of Surgical Sciences, School of Veterinary Medicine; University of Wisconsin; Madison Wisconsin
| | - Christopher J. Murphy
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine; University of California; Davis California
- Ophthalmology & Vision Science, School of Medicine; University of California; Davis California
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32
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Martino MM, Briquez PS, Güç E, Tortelli F, Kilarski WW, Metzger S, Rice JJ, Kuhn GA, Müller R, Swartz MA, Hubbell JA. Growth factors engineered for super-affinity to the extracellular matrix enhance tissue healing. Science 2014; 343:885-8. [PMID: 24558160 DOI: 10.1126/science.1247663] [Citation(s) in RCA: 336] [Impact Index Per Article: 33.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Growth factors (GFs) are critical in tissue repair, but their translation to clinical use has been modest. Physiologically, GF interactions with extracellular matrix (ECM) components facilitate localized and spatially regulated signaling; therefore, we reasoned that the lack of ECM binding in their clinically used forms could underlie the limited translation. We discovered that a domain in placenta growth factor-2 (PlGF-2(123-144)) binds exceptionally strongly and promiscuously to ECM proteins. By fusing this domain to the GFs vascular endothelial growth factor-A, platelet-derived growth factor-BB, and bone morphogenetic protein-2, we generated engineered GF variants with super-affinity to the ECM. These ECM super-affinity GFs induced repair in rodent models of chronic wounds and bone defects that was greatly enhanced as compared to treatment with the wild-type GFs, demonstrating that this approach may be useful in several regenerative medicine applications.
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Affiliation(s)
- Mikaël M Martino
- Institute of Bioengineering, School of Life Sciences and School of Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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33
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Tam K, Cheyyatraviendran S, Venugopal J, Biswas A, Choolani M, Ramakrishna S, Bongso A, Fong CY. A Nanoscaffold Impregnated With Human Wharton's Jelly Stem Cells or Its Secretions Improves Healing of Wounds. J Cell Biochem 2014; 115:794-803. [DOI: 10.1002/jcb.24723] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Accepted: 11/18/2013] [Indexed: 01/13/2023]
Affiliation(s)
- Kimberley Tam
- Department of Obstetrics and Gynaecology; Yong Yoo Lin School of Medicine; National University Health System; National University of Singapore; Kent Ridge; Singapore 119228 Singapore
| | - Suganya Cheyyatraviendran
- Department of Obstetrics and Gynaecology; Yong Yoo Lin School of Medicine; National University Health System; National University of Singapore; Kent Ridge; Singapore 119228 Singapore
| | - Jayarama Venugopal
- Department of Mechanical Engineering, Centre for Nanofibers and Nanotechnology; School of Engineering; National University of Singapore; Singapore 117576 Singapore
| | - Arijit Biswas
- Department of Obstetrics and Gynaecology; Yong Yoo Lin School of Medicine; National University Health System; National University of Singapore; Kent Ridge; Singapore 119228 Singapore
| | - Mahesh Choolani
- Department of Obstetrics and Gynaecology; Yong Yoo Lin School of Medicine; National University Health System; National University of Singapore; Kent Ridge; Singapore 119228 Singapore
| | - Seeram Ramakrishna
- Department of Mechanical Engineering, Centre for Nanofibers and Nanotechnology; School of Engineering; National University of Singapore; Singapore 117576 Singapore
| | - Ariff Bongso
- Department of Obstetrics and Gynaecology; Yong Yoo Lin School of Medicine; National University Health System; National University of Singapore; Kent Ridge; Singapore 119228 Singapore
| | - Chui-Yee Fong
- Department of Obstetrics and Gynaecology; Yong Yoo Lin School of Medicine; National University Health System; National University of Singapore; Kent Ridge; Singapore 119228 Singapore
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34
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Gooyit M, Peng Z, Wolter WR, Ping H, Ding D, Hesek D, Lee M, Boggess B, Champion MM, Suckow MA, Mobashery S, Chang M. A chemical biological strategy to facilitate diabetic wound healing. ACS Chem Biol 2014; 9:105-10. [PMID: 24053680 PMCID: PMC3947039 DOI: 10.1021/cb4005468] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A complication of diabetes is the inability of wounds to heal in diabetic patients. Diabetic wounds are refractory to healing due to the involvement of activated matrix metalloproteinases (MMPs), which remodel the tissue resulting in apoptosis. There are no readily available methods that identify active unregulated MMPs. With the use of a novel inhibitor-tethered resin that binds exclusively to the active forms of MMPs, coupled with proteomics, we quantified MMP-8 and MMP-9 in a mouse model of diabetic wounds. Topical treatment with a selective MMP-9 inhibitor led to acceleration of wound healing, re-epithelialization, and significantly attenuated apoptosis. In contrast, selective pharmacological inhibition of MMP-8 delayed wound healing, decreased re-epithelialization, and exhibited high apoptosis. The MMP-9 activity makes the wounds refractory to healing, whereas that of MMP-8 is beneficial. The treatment of diabetic wounds with a selective MMP-9 inhibitor holds great promise in providing heretofore-unavailable opportunities for intervention of this disease.
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Affiliation(s)
- Major Gooyit
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA 46556
| | - Zhihong Peng
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA 46556
| | - William R. Wolter
- Freimann Life Sciences Center and Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, USA 46556
| | - Hualiang Ping
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA 46556
| | - Derong Ding
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA 46556
| | - Dusan Hesek
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA 46556
| | - Mijoon Lee
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA 46556
| | - Bill Boggess
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA 46556
| | - Matthew M. Champion
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA 46556
| | - Mark A. Suckow
- Freimann Life Sciences Center and Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, USA 46556
| | - Shahriar Mobashery
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA 46556
| | - Mayland Chang
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA 46556
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Guthrie KM, Agarwal A, Teixeira LBC, Dubielzig RR, Abbott NL, Murphy CJ, Singh H, McAnulty JF, Schurr MJ. Integration of silver nanoparticle-impregnated polyelectrolyte multilayers into murine-splinted cutaneous wound beds. J Burn Care Res 2013; 34:e359-67. [PMID: 23511285 PMCID: PMC4609547 DOI: 10.1097/bcr.0b013e31827e7ef9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Silver is a commonly used topical antimicrobial. However, technologies to immobilize silver at the wound surface are lacking, while currently available silver-containing wound dressings release excess silver that can be cytotoxic and impair wound healing. We have shown that precise concentrations of silver at lower levels can be immobilized into a wound bed using a polyelectrolyte multilayer attachment technology. These silver nanoparticle-impregnated polyelectrolyte multilayers are noncytotoxic yet bactericidal in vitro, but their effect on wound healing in vivo was previously unknown. The purpose of this study was to determine the effect on wound healing of integrating silver nanoparticle/polyelectrolyte multilayers into the wound bed. A full-thickness, splinted, excisional murine wound healing model was employed in both phenotypically normal mice and spontaneously diabetic mice (healing impaired model). Gross image measurements showed an initial small lag in healing in the silver-treated wounds in diabetic mice, but no difference in time to complete wound closure in either normal or diabetic mice. Histological analysis showed modest differences between silver-treated and control groups on day 9, but no difference between groups at the time of wound closure. We conclude that silver nanoparticle/polyelectrolyte multilayers can be safely integrated into the wound beds of both normal and diabetic mice without delaying wound closure, and with transient histological effects. The results of this study suggest the feasibility of this technology for use as a platform to affect nanoscale wound engineering approaches to microbial prophylaxis or to augment wound healing.
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Affiliation(s)
- Kathleen M. Guthrie
- University of Wisconsin, School of Veterinary Medicine, Department of Surgical Sciences
| | - Ankit Agarwal
- University of Wisconsin, Department of Chemical and Biological Engineering
| | - Leandro B. C. Teixeira
- University of Wisconsin, School of Veterinary Medicine, Department of Pathobiological Sciences
| | - Richard R. Dubielzig
- University of Wisconsin, School of Veterinary Medicine, Department of Pathobiological Sciences
| | - Nicholas L. Abbott
- University of Wisconsin, Department of Chemical and Biological Engineering
| | - Christopher J. Murphy
- University of Wisconsin, School of Veterinary Medicine, Department of Surgical Sciences
- UC Davis, School of Medicine, Department of Ophthalmology and Vision Science
- UC Davis, School of Veterinary Medicine, Department of Surgical and Radiological Sciences
| | - Harpreet Singh
- Tufts University, Cummings School of Veterinary Medicine
| | - Jonathan F. McAnulty
- University of Wisconsin, School of Veterinary Medicine, Department of Surgical Sciences
| | - Michael J. Schurr
- University of Colorado-Denver, School of Medicine, Department of Surgery
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Minamimura A, Ichioka S, Sano H, Sekiya N. Comparison of collagen matrix treatment impregnated with platelet rich plasma vs bone marrow. J Plast Surg Hand Surg 2013; 48:15-20. [DOI: 10.3109/2000656x.2013.793193] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Heparin-binding domain of fibrin(ogen) binds growth factors and promotes tissue repair when incorporated within a synthetic matrix. Proc Natl Acad Sci U S A 2013; 110:4563-8. [PMID: 23487783 DOI: 10.1073/pnas.1221602110] [Citation(s) in RCA: 319] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
By binding growth factors (GFs), the ECM tightly regulates their activity. We recently reported that the heparin-binding domain II of fibronectin acts as a promiscuous high-affinity GF-binding domain. Here we hypothesized that fibrin, the provisional ECM during tissue repair, also could be highly promiscuous in its GF-binding capacity. Using multiple affinity-based assays, we found that fibrin(ogen) and its heparin-binding domain bind several GFs from the PDGF/VEGF and FGF families and some GFs from the TGF-β and neurotrophin families. Overall, we identified 15 unique binding interactions. The GF binding ability of fibrinogen caused prolonged retention of many of the identified GFs within fibrin. Thus, based on the promiscuous and high-affinity interactions in fibrin, GF binding may be one of fibrin's main physiological functions, and these interactions may potentially play an important and ubiquitous role during tissue repair. To prove this role in a gain-of-function model, we incorporated the heparin-binding domain of fibrin into a synthetic fibrin-mimetic matrix. In vivo, the multifunctional synthetic matrix could fully mimic the effect of fibrin in a diabetic mouse model of impaired wound healing, demonstrating the benefits of generating a hybrid biomaterial consisting of a synthetic polymeric scaffold and recombinant bioactive ECM domains. The reproduction of GF-ECM interactions with a fibrin-mimetic matrix could be clinically useful, and has the significant benefit of a more straightforward regulatory path associated with chemical synthesis rather than human sourcing.
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Downregulated gene expression of TGF-βs in diabetic oral wound healing. J Craniomaxillofac Surg 2013; 41:e42-8. [DOI: 10.1016/j.jcms.2012.08.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Revised: 08/07/2012] [Accepted: 08/08/2012] [Indexed: 01/23/2023] Open
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Martino MM, Tortelli F, Mochizuki M, Traub S, Ben-David D, Kuhn GA, Müller R, Livne E, Eming SA, Hubbell JA. Engineering the growth factor microenvironment with fibronectin domains to promote wound and bone tissue healing. Sci Transl Med 2012; 3:100ra89. [PMID: 21918106 DOI: 10.1126/scitranslmed.3002614] [Citation(s) in RCA: 316] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Although growth factors naturally exert their morphogenetic influences within the context of the extracellular matrix microenvironment, the interactions among growth factors, their receptors, and other extracellular matrix components are typically ignored in clinical delivery of growth factors. We present an approach for engineering the cellular microenvironment to greatly accentuate the effects of vascular endothelial growth factor-A (VEGF-A) and platelet-derived growth factor-BB (PDGF-BB) for skin repair, and of bone morphogenetic protein-2 (BMP-2) and PDGF-BB for bone repair. A multifunctional recombinant fragment of fibronectin (FN) was engineered to comprise (i) a factor XIIIa substrate fibrin-binding sequence, (ii) the 9th to 10th type III FN repeat (FN III9-10) containing the major integrin-binding domain, and (iii) the 12th to 14th type III FN repeat (FN III12-14), which binds growth factors promiscuously, including VEGF-A165, PDGF-BB, and BMP-2. We show potent synergistic signaling and morphogenesis between α5β1 integrin and the growth factor receptors, but only when FN III9-10 and FN III12-14 are proximally presented in the same polypeptide chain (FN III9-10/12-14). The multifunctional FN III9-10/12-14 greatly enhanced the regenerative effects of the growth factors in vivo in a diabetic mouse model of chronic wounds (primarily through an angiogenic mechanism) and in a rat model of critical-size bone defects (through a mesenchymal stem cell recruitment mechanism) at doses where the growth factors delivered within fibrin only had no significant effects.
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Affiliation(s)
- Mikaël M Martino
- Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
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Fleckman P, Usui M, Zhao G, Underwood R, Maginness M, Marshall A, Glaister C, Ratner B, Olerud J. Cutaneous and inflammatory response to long-term percutaneous implants of sphere-templated porous/solid poly(HEMA) and silicone in mice. J Biomed Mater Res A 2012; 100:1256-68. [PMID: 22359383 DOI: 10.1002/jbm.a.34012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Revised: 10/17/2011] [Accepted: 10/24/2011] [Indexed: 11/10/2022]
Abstract
This study investigates mouse cutaneous responses to long-term percutaneously implanted rods surrounded by sphere-templated porous biomaterials engineered to mimic medical devices surrounded by a porous cuff. We hypothesized that keratinocytes would migrate through the pores and stop, permigrate, or marsupialize along the porous/solid interface. Porous/solid-core poly(2-hydroxyethyl methacrylate) [poly(HEMA)] and silicone rods were implanted in mice for 14 days, and for 1, 3, and 6 months. Implants with surrounding tissue were analyzed (immuno)histochemically by light microscopy. Poly(HEMA)/skin implants yielded better morphologic data than silicone implants. Keratinocytes at the poly(HEMA) interface migrated in two different directions. "Ventral" keratinocytes contiguous with the dermal-epidermal junction migrated into the outermost pores, forming an integrated collar surrounding the rods. "Dorsal" keratinocytes appearing to emanate from the differentiated epithelial layer, extended upward along and into the exterior portion of the rod, forming an integrated sheath. Leukocytes persisted in poly(HEMA) and silicone pores for the duration of the study. Vascular and collagen networks within the poly(HEMA) pores matured as a function of time up to 3-months implantation. Nerves were not observed within the pores. Poly(HEMA) underwent morphological changes by 6 months of implantation. Marsupialization, foreign body encapsulation, and infection were not observed in any implants.
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Affiliation(s)
- Philip Fleckman
- Department of Medicine (Dermatology), University of Washington, Seattle, Washington, USA.
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Lu A, Miao M, Schoeb TR, Agarwal A, Murphy-Ullrich JE. Blockade of TSP1-dependent TGF-β activity reduces renal injury and proteinuria in a murine model of diabetic nephropathy. THE AMERICAN JOURNAL OF PATHOLOGY 2011; 178:2573-86. [PMID: 21641382 DOI: 10.1016/j.ajpath.2011.02.039] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Revised: 01/06/2011] [Accepted: 02/08/2011] [Indexed: 12/20/2022]
Abstract
Transforming growth factor-β (TGF-β) is key in the pathogenesis of diabetic nephropathy. Thrombospondin 1 (TSP1) expression is increased in diabetes, and TSP1 regulates latent TGF-β activation in vitro and in diabetic animal models. Herein, we investigate the effect of blockade of TSP1-dependent TGF-β activation on progression of renal disease in a mouse model of type 1 diabetes (C57BL/6J-Ins2(Akita)) as a targeted treatment for diabetic nephropathy. Akita and control C57BL/6 mice who underwent uninephrectomy received 15 weeks of thrice-weekly i.p. treatment with 3 or 30 mg/kg LSKL peptide, control SLLK peptide, or saline. The effects of systemic LSKL peptide on dermal wound healing was assessed in type 2 diabetic mice (db/db). Proteinuria (urinary albumin level and albumin/creatinine ratio) was significantly improved in Akita mice treated with 30 mg/kg LSKL peptide. LSKL treatment reduced urinary TGF-β activity and renal phospho-Smad2/3 levels and improved markers of tubulointerstitial injury (fibronectin) and podocytes (nephrin). However, LSKL did not alter glomerulosclerosis or glomerular structure. LSKL did not increase tumor incidence or inflammation or impair diabetic wound healing. These data suggest that selective targeting of excessive TGF-β activity through blockade of TSP1-dependent TGF-β activation represents a therapeutic strategy for treating diabetic nephropathy that preserves the homeostatic functions of TGF-β.
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Affiliation(s)
- Ailing Lu
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, USA
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Hardwicke JT, Hart J, Bell A, Duncan R, Thomas DW, Moseley R. The effect of dextrin-rhEGF on the healing of full-thickness, excisional wounds in the (db/db) diabetic mouse. J Control Release 2011; 152:411-7. [PMID: 21435363 DOI: 10.1016/j.jconrel.2011.03.016] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Revised: 03/07/2011] [Accepted: 03/13/2011] [Indexed: 12/24/2022]
Abstract
Chronic wounds, such as ulceration of the lower limb, represent a significant clinical challenge in today's ageing society. With the aim of identifying improved therapeutics, we have previously described a bioresponsive, dextrin-recombinant human epidermal growth factor conjugate (dextrin-rhEGF), that (i) protects rhEGF against proteolytic degradation by human chronic wound fluid; and (ii) mediates rhEGF release by α-amylase, capable of stimulating increased proliferation/migration in normal dermal and chronic wound fibroblasts; and keratinocytes, in vitro. The aim of this study was to extend these findings, by investigating the effects of dextrin-rhEGF on wound healing in the (db/db) diabetic mouse, a widely used in vivo model of delayed wound healing. Standardised, full-thickness excisional wounds, created in the dorsal flank skin, were treated topically with succinoylated dextrin (50 μg/mL), rhEGF (10 μg/mL) or dextrin-rhEGF (1 or 10 μg/mL). Treatments were applied immediately after injury and subsequently on post-wounding, days 3 and 8. Wound healing was assessed macroscopically, in terms of initiation of neo-dermal tissue deposition and wound closure (including wound contraction and re-epithelialisation), over a 16 day period. Wound healing was assessed histologically, in terms of granulation tissue formation/maturity; cranio-caudal wound contraction and wound angiogenesis (CD31 immuno-staining), using tissues harvested at day 16. Blood samples were also analysed for α-amylase and rhEGF concentrations. In this established impaired wound healing model, the topically-applied dextrin-rhEGF significantly accelerated wound closure and neo-dermal tissue formation at the macroscopic level; and significantly increased granulation tissue deposition and angiogenesis at the histological level (p<0.05), relative to untreated, succinoylated dextrin and rhEGF alone controls. Overall, these findings support the further development of bioresponsive polymer conjugates, for tissue repair.
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Affiliation(s)
- Joseph T Hardwicke
- Wound Biology Group, Cardiff Institute of Tissue Engineering and Repair (CITER), Tissue Engineering and Reparative Dentistry, School of Dentistry, Cardiff University, Heath Park, UK
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Muffley LA, Zhu KQ, Engrav LH, Gibran NS, Hocking AM. Spatial and temporal localization of the melanocortin 1 receptor and its ligand α-melanocyte-stimulating hormone during cutaneous wound repair. J Histochem Cytochem 2011; 59:278-88. [PMID: 21378282 DOI: 10.1369/0022155410397999] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Growing evidence indicates that the melanocortin 1 receptor (MC1R) and its ligand α-melanocyte-stimulating hormone (α-MSH) have other functions in the skin in addition to pigment production. Activation of the MC1R/α-MSH signaling pathway has been implicated in the regulation of both inflammation and extracellular matrix homeostasis. However, little is known about the role of MC1R/α-MSH signaling in the regulation of inflammatory and fibroproliferative responses to cutaneous injury. Although MC1R and α-MSH localization has been described in uninjured skin, their spatial and temporal expression during cutaneous wound repair has not been investigated. In this study, the authors report the localization of MC1R and α-MSH in murine cutaneous wounds, human acute burns, and hypertrophic scars. During murine wound repair, MC1R and α-MSH were detected in inflammatory cells and suprabasal keratinocytes at the leading edge of the migrating epithelial tongue. MC1R and α-MSH protein levels were upregulated in human burn wounds and hypertrophic scars compared to uninjured human skin, where receptor and ligand were absent. In burn wounds and hypertrophic scars, MC1R and α-MSH localized to epidermal keratinocytes and dermal fibroblasts. This spatiotemporal localization of MC1R and α-MSH in cutaneous wounds warrants future investigation into the role of MC1R/α-MSH signaling in the inflammatory and fibroproliferative responses to cutaneous injury. This article contains online supplemental material at http://www.jhc.org. Please visit this article online to view these materials.
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Affiliation(s)
- Lara A Muffley
- Department of Surgery, University of Washington, Seattle, Washington 98104, USA
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Fukano Y, Usui ML, Underwood RA, Isenhath S, Marshall AJ, Hauch KD, Ratner BD, Olerud JE, Fleckman P. Epidermal and dermal integration into sphere-templated porous poly(2-hydroxyethyl methacrylate) implants in mice. J Biomed Mater Res A 2010; 94:1172-86. [PMID: 20694984 DOI: 10.1002/jbm.a.32798] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Percutaneous medical devices remain susceptible to infection and failure. We hypothesize that healing of the skin into the percutaneous device will provide a seal, preventing bacterial attachment, biofilm formation, and subsequent device failure. Porous poly(2-hydroxyethyl methacrylate) [poly(HEMA)] with sphere-templated pores (40 microm) and interconnecting throats (16 microm) were implanted in normal C57BL/6 mice for 7, 14, and 28 days. Poly(HEMA) was either untreated, keeping the surface nonadhesive for cells and proteins, or modified with carbonyldiimidazole (CDI) or CDI reacted with laminin 332 to enhance adhesion. No clinical signs of infection were observed. Epidermal and dermal response within the poly(HEMA) pores was evaluated using light and transmission electron microscopy. Cells (keratinocytes, fibroblasts, endothelial cells, inflammatory cells) and basement membrane proteins (laminin 332, beta4 integrin, type VII collagen) could be demonstrated within the poly(HEMA) pores of all implants. Blood vessels and dermal collagen bundles were evident in all of the 14- and 28-day implants. Fibrous capsule formation and permigration were not observed. Sphere-templated polymers with 40 microm pores demonstrate an ability to recapitulate key elements of both the dermal and the epidermal layers of skin. Our morphological findings indicate that the implant model can be used to study the effects of biomaterial pore size, pore interconnect (throat) size, and surface treatments on cutaneous biointegration. Further, this model may be used for bacterial challenge studies.
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Affiliation(s)
- Y Fukano
- Department of Medicine (Dermatology), University of Washington, Seattle, Washington, USA
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Zhao G, Hochwalt PC, Usui ML, Underwood RA, Singh PK, James GA, Stewart PS, Fleckman P, Olerud JE. Delayed wound healing in diabetic (db/db) mice with Pseudomonas aeruginosa biofilm challenge: a model for the study of chronic wounds. Wound Repair Regen 2010; 18:467-77. [PMID: 20731798 DOI: 10.1111/j.1524-475x.2010.00608.x] [Citation(s) in RCA: 181] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Chronic wounds are a major clinical problem that lead to considerable morbidity and mortality. We hypothesized that an important factor in the failure of chronic wounds to heal was the presence of microbial biofilm resistant to antibiotics and protected from host defenses. A major difficulty in studying chronic wounds is the absence of suitable animal models. The goal of this study was to create a reproducible chronic wound model in diabetic mice by the application of bacterial biofilm. Six-millimeter punch biopsy wounds were created on the dorsal surface of diabetic (db/db) mice, subsequently challenged with Pseudomonas aeruginosa (PAO1) biofilms 2 days postwounding, and covered with semiocclusive dressings for 2 weeks. Most of the control wounds were epithelialized by 28 days postwounding. In contrast, none of biofilm-challenged wounds were closed. Histological analysis showed extensive inflammatory cell infiltration, tissue necrosis, and epidermal hyperplasia adjacent to challenged wounds-all indicators of an inflammatory nonhealing wound. Quantitative cultures and transmission electron microscopy demonstrated that the majority of bacteria were in the scab above the wound bed rather than in the wound tissue. The model was reproducible, allowed localized cutaneous wound infections without high mortality, and demonstrated delayed wound healing following a biofilm challenge. This model may provide an approach to study the role of microbial biofilms in chronic wounds as well as the effect of specific biofilm therapy on wound healing.
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Affiliation(s)
- Ge Zhao
- Department of Medicine, Division of Dermatology, University of Washington, Seattle, Washington 98195, USA.
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Chung TY, Peplow PV, Baxter GD. Testing photobiomodulatory effects of laser irradiation on wound healing: development of an improved model for dressing wounds in mice. Photomed Laser Surg 2010; 28:589-96. [PMID: 20666635 DOI: 10.1089/pho.2009.2641] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE To develop a suitable method for dressing skin wounds in BKS.Cg-m(+)/(+)Lepr(db) mice for subsequent use in laser irradiation of wounds. The healing of nonirradiated wounds (controls) was examined histologically to provide essential reference data. BACKGROUND DATA Dressing excisional skin wounds in mice has many advantages. However, previous studies using dressings such as Tegaderm W or OpSite, with or without adhesives, have shown that this is not easily achieved. MATERIALS AND METHODS In a pilot study, a full-thickness wound was made on the left flank in six diabetic and six nondiabetic mice, and five different methods were tried for dressing the wounds with Tegaderm HP to develop an optimized procedure. The optimized procedure was used in subsequent studies, with a total of 23 diabetic and 13 nondiabetic mice being controls for laser-irradiated mice. Measurements of healing outcomes from histologic sections of controls were statistically analyzed. RESULTS The optimized procedure used Tegaderm HP with Cavilon and Fixomull Stretch strips for the first dressing, and with Mastisol for subsequent dressings. Wound closure by contraction was retarded in a large proportion of diabetic mice (approximately 80%) and a small proportion of nondiabetic mice. These wounds, described as "splinted," healed mainly by epithelial regeneration and granulation tissue formation. CONCLUSION A simple, easy-to-perform procedure was developed for dressing wounds in diabetic and nondiabetic mice. It was found to cause splinting with wound healing mimicking that in human patients. This model is suitable for examining the effects of different therapies on wound healing, including lasers.
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Affiliation(s)
- Tzu-Yun Chung
- Department of Anatomy & Structural Biology, School of Physiotherapy, University of Otago, Dunedin, New Zealand
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Peplow PV, Chung TY, Baxter GD. Laser Photobiomodulation of Wound Healing: A Review of Experimental Studies in Mouse and Rat Animal Models. Photomed Laser Surg 2010; 28:291-325. [DOI: 10.1089/pho.2008.2446] [Citation(s) in RCA: 149] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Philip V. Peplow
- Department of Anatomy & Structural Biology, University of Otago, Dunedin, New Zealand
| | - Tzu-Yun Chung
- Department of Anatomy & Structural Biology, University of Otago, Dunedin, New Zealand
| | - G. David Baxter
- Centre for Physiotherapy Research, School of Physiotherapy, University of Otago, Dunedin, New Zealand
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Khanna S, Biswas S, Shang Y, Collard E, Azad A, Kauh C, Bhasker V, Gordillo GM, Sen CK, Roy S. Macrophage dysfunction impairs resolution of inflammation in the wounds of diabetic mice. PLoS One 2010; 5:e9539. [PMID: 20209061 PMCID: PMC2832020 DOI: 10.1371/journal.pone.0009539] [Citation(s) in RCA: 414] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2009] [Accepted: 02/11/2010] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Chronic inflammation is a characteristic feature of diabetic cutaneous wounds. We sought to delineate novel mechanisms involved in the impairment of resolution of inflammation in diabetic cutaneous wounds. At the wound-site, efficient dead cell clearance (efferocytosis) is a pre-requisite for the timely resolution of inflammation and successful healing. METHODOLOGY/PRINCIPAL FINDINGS Macrophages isolated from wounds of diabetic mice showed significant impairment in efferocytosis. Impaired efferocytosis was associated with significantly higher burden of apoptotic cells in wound tissue as well as higher expression of pro-inflammatory and lower expression of anti-inflammatory cytokines. Observations related to apoptotic cell load at the wound site in mice were validated in the wound tissue of diabetic and non-diabetic patients. Forced Fas ligand driven elevation of apoptotic cell burden at the wound site augmented pro-inflammatory and attenuated anti-inflammatory cytokine response. Furthermore, successful efferocytosis switched wound macrophages from pro-inflammatory to an anti-inflammatory mode. CONCLUSIONS/SIGNIFICANCE Taken together, this study presents first evidence demonstrating that diabetic wounds suffer from dysfunctional macrophage efferocytosis resulting in increased apoptotic cell burden at the wound site. This burden, in turn, prolongs the inflammatory phase and complicates wound healing.
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Affiliation(s)
- Savita Khanna
- Comprehensive Wound Center, Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Medical Center, Columbus, Ohio, United States of America
| | - Sabyasachi Biswas
- Comprehensive Wound Center, Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Medical Center, Columbus, Ohio, United States of America
| | - Yingli Shang
- Comprehensive Wound Center, Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Medical Center, Columbus, Ohio, United States of America
| | - Eric Collard
- Comprehensive Wound Center, Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Medical Center, Columbus, Ohio, United States of America
| | - Ali Azad
- Comprehensive Wound Center, Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Medical Center, Columbus, Ohio, United States of America
| | - Courtney Kauh
- Comprehensive Wound Center, Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Medical Center, Columbus, Ohio, United States of America
| | - Vineet Bhasker
- Comprehensive Wound Center, Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Medical Center, Columbus, Ohio, United States of America
| | - Gayle M. Gordillo
- Comprehensive Wound Center, Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Medical Center, Columbus, Ohio, United States of America
| | - Chandan K. Sen
- Comprehensive Wound Center, Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Medical Center, Columbus, Ohio, United States of America
| | - Sashwati Roy
- Comprehensive Wound Center, Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Medical Center, Columbus, Ohio, United States of America
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Improved cutaneous healing in diabetic mice exposed to healthy peripheral circulation. J Invest Dermatol 2009; 129:2265-74. [PMID: 19295612 DOI: 10.1038/jid.2009.60] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Impaired repair of skin defects is a major complication of diabetes; yet, the pathophysiology of diabetic (db) wound healing remains largely opaque. Here, we investigate the role of humoral factors in modulating db wound repair by generating chimeric animals through parabiotic joining of wild-type (wt) and diabetic (db/db) mice. This strategy allows wounds on healing-deficient db/db mice to be exposed to factors derived from the wt circulation at physiologically appropriate concentrations. When compared with db controls, chimeric db/db animals showed significantly improved healing of full-thickness, cutaneous wounds, with enhanced granulation tissue formation, angiogenesis, cell proliferation, and collagen deposition. Glycemic control was unaffected by parabiosis; however, the distribution of circulating leukocytes, altered in db controls, normalized in db-chimeras. Both wt and db cells were recruited from circulation into db wounds, but wt cells never exceeded 20% of total cells. Improved angiogenesis persisted in db-chimeras separated 24 hours after wounding, suggesting the existence of long-term normalizing factors. This study establishes a new model for studying db wound healing, and shows a key role for circulating factors in normalizing wound repair in diabetes.
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Breen A, Mc Redmond G, Dockery P, O'Brien T, Pandit A. Assessment of wound healing in the alloxan-induced diabetic rabbit ear model. J INVEST SURG 2009; 21:261-9. [PMID: 19160134 DOI: 10.1080/08941930802216807] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The enhancement of diabetic wound healing represents a major clinical challenge to researchers. The challenge faced is to identify a suitable animal model that best represents the human situation. However, the majority of diabetic wound healing models are in rodents and are hindered by rapid contraction and thus do not reflect epithelial cell migration, as seen in the human wound. The alloxan-induced diabetic rabbit model is a cheap, reproducible model and offers the advantage of providing a noncontractile avascular wound bed. This study aimed to compare the effects of acute hyperglycemia in the alloxan model to normal rabbit controls on wound healing, using methods of stereology. Alloxan was administered 7 days prior to surgery. Four full-thickness punch biopsy wounds were created on each ear (n = 4). Wounds were excised at 7 and 14 days and prepared for stereological analysis from Masson's trichrome-stained histological sections. It was noted that the alloxan-treated animals showed an increase in the number of inflammatory cells and fibroblasts at 14 days. In addition, it was noted that the length density of blood vessels was reduced in the alloxan-induced diabetic rabbits, representing a greater radial diffusion distance between vessels and a less efficient network for nutrient exchange. This is the first study to take a stereological approach to defining the effects of diabetes mellitus on wound healing in a noncontractile model.
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Affiliation(s)
- Ailish Breen
- National Centre for Biomedical Engineering Science and Department of Mechanical and Biomedical Engineering, National University of Ireland, Galway.
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