1
|
Han C, Leonardo TR, Romana-Souza B, Shi J, Keiser S, Yuan H, Altakriti M, Ranzer MJ, Ferri-Borgogno S, Mok SC, Koh TJ, Hong SJ, Chen L, DiPietro LA. Microfibril-associated protein 5 and the regulation of skin scar formation. Sci Rep 2023; 13:8728. [PMID: 37253753 PMCID: PMC10229580 DOI: 10.1038/s41598-023-35558-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 05/20/2023] [Indexed: 06/01/2023] Open
Abstract
Many factors regulate scar formation, which yields a modified extracellular matrix (ECM). Among ECM components, microfibril-associated proteins have been minimally explored in the context of skin wound repair. Microfibril-associated protein 5 (MFAP5), a small 25 kD serine and threonine rich microfibril-associated protein, influences microfibril function and modulates major extracellular signaling pathways. Though known to be associated with fibrosis and angiogenesis in certain pathologies, MFAP5's role in wound healing is unknown. Using a murine model of skin wound repair, we found that MFAP5 is significantly expressed during the proliferative and remodeling phases of healing. Analysis of existing single-cell RNA-sequencing data from mouse skin wounds identified two fibroblast subpopulations as the main expressors of MFAP5 during wound healing. Furthermore, neutralization of MFAP5 in healing mouse wounds decreased collagen deposition and refined angiogenesis without altering wound closure. In vitro, recombinant MFAP5 significantly enhanced dermal fibroblast migration, collagen contractility, and expression of pro-fibrotic genes. Additionally, TGF-ß1 increased MFAP5 expression and production in dermal fibroblasts. Our findings suggest that MFAP5 regulates fibroblast function and influences scar formation in healing wounds. Our work demonstrates a previously undescribed role for MFAP5 and suggests that microfibril-associated proteins may be significant modulators of wound healing outcomes and scarring.
Collapse
Affiliation(s)
- Chen Han
- Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, IL, USA
| | - Trevor R Leonardo
- Department of Microbiology and Immunology, College of Medicine, University of Illinois Chicago, Chicago, IL, USA
| | - Bruna Romana-Souza
- Department of Histology and Embryology, Rio de Janeiro State University, Rio de Janeiro, RJ, Brazil
| | - Junhe Shi
- NMPA Key Laboratory for Clinical Research and Evaluation of Traditional Chinese Medicine, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Shalyn Keiser
- Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, IL, USA
| | - Heidi Yuan
- Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, IL, USA
| | - Mohamad Altakriti
- Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, IL, USA
| | - Matthew J Ranzer
- Department of Surgery, University of Illinois Chicago, Chicago, IL, USA
| | - Sammy Ferri-Borgogno
- Department of Gynecologic Oncology and Reproductive Medicine, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Samuel C Mok
- Department of Gynecologic Oncology and Reproductive Medicine, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Timothy J Koh
- Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, IL, USA
- Department of Kinesiology and Nutrition, University of Illinois Chicago, Chicago, IL, USA
| | - Seok Jong Hong
- Department of Surgery, Northwestern University-Feinberg School of Medicine, Chicago, IL, USA
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, IL, USA.
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, IL, USA.
| |
Collapse
|
2
|
Romana-Souza B, Chen L, DiPietro LA. Repeated stress-induced crosstalk between the sympathetic nervous system and mast cells contributes to delayed cutaneous wound healing in mice. J Neuroimmunol 2023; 379:578104. [PMID: 37196594 DOI: 10.1016/j.jneuroim.2023.578104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Revised: 04/03/2023] [Accepted: 05/09/2023] [Indexed: 05/19/2023]
Abstract
The study identifies a link between the neuroimmune interaction and the impairment of wound healing induced by repeated stress. Stress increased mast cell mobilization and degranulation, levels of IL-10, and sympathetic reinnervation in mouse wounds. In contrast to mast cells, macrophage infiltration into wounds was significantly delayed in stressed mice. Chemical sympathectomy and the blockade of mast cell degranulation reversed the effect of stress on skin wound healing in vivo. In vitro, high epinephrine levels stimulated mast cell degranulation and IL-10 release. In conclusion, catecholamines released by the sympathetic nervous system stimulate mast cells to secrete anti-inflammatory cytokines that impair inflammatory cell mobilization, leading to a delay in the resolution of wound healing under stress conditions.
Collapse
Affiliation(s)
- Bruna Romana-Souza
- Department of Histology and Embryology, Rio de Janeiro State University, Rio de Janeiro, Brazil.
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, IL, USA
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, IL, USA
| |
Collapse
|
3
|
Leonardo TR, Chen L, Schrementi ME, Shi J, Marucha PT, Glass K, DiPietro LA. Transcriptional changes in human palate and skin healing. Wound Repair Regen 2023; 31:156-170. [PMID: 36571451 PMCID: PMC10006330 DOI: 10.1111/wrr.13068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 10/26/2022] [Accepted: 12/20/2022] [Indexed: 12/27/2022]
Abstract
Most human tissue injuries lead to the formation of a fibrous scar and result in the loss of functional tissue. One adult tissue that exhibits a more regenerative response to injury with minimal scarring is the oral mucosa. We generated a microarray gene expression dataset to examine the response to injury in human palate and skin excisional biopsies spanning the first 7 days after wounding. Differential expression analyses were performed in each tissue to identify genes overexpressed or underexpressed over time when compared to baseline unwounded tissue gene expression levels. To attribute biological processes of interest to these gene expression changes, gene set enrichment analysis was used to identify core gene sets that are enriched over the time-course of the wound healing process with respect to unwounded tissue. This analysis identified gene sets uniquely enriched in either palate or skin wounds and gene sets that are enriched in both tissues in at least one time point after injury. Finally, a cell type enrichment analysis was performed to better understand the cell type distribution in these tissues and how it changes over the time course of wound healing. This work provides a source of human wound gene expression data that includes two tissue types with distinct regenerative and scarring phenotypes.
Collapse
Affiliation(s)
- Trevor R Leonardo
- Department of Microbiology and Immunology, University of Illinois Chicago, Chicago, Illinois, USA
- Department of Periodontics, Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, Illinois, USA
| | - Lin Chen
- Department of Periodontics, Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, Illinois, USA
| | - Megan E Schrementi
- Department of Science and Health, DePaul University, Chicago, Illinois, USA
| | - Junhe Shi
- Department of Periodontics, Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, Illinois, USA
- National Medical Products Administration Key Laboratory for Clinical Research and Evaluation of Traditional Chinese Medicine, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Phillip T Marucha
- Department of Periodontics, College of Dentistry, Oregon Health and Sciences University, Portland, Oregon, USA
| | - Kimberly Glass
- Channing Division of Network Medicine,Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Department of Biostatistics, Harvard Chan School of Public Health, Boston, Massachusetts, USA
| | - Luisa A DiPietro
- Department of Periodontics, Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, Illinois, USA
| |
Collapse
|
4
|
Chen Z, Haus JM, DiPietro LA, Koh TJ, Minshall RD. Neutralization of excessive CCL28 improves wound healing in diabetic mice. Front Pharmacol 2023; 14:1087924. [PMID: 36713846 PMCID: PMC9880283 DOI: 10.3389/fphar.2023.1087924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 01/03/2023] [Indexed: 01/14/2023] Open
Abstract
Introduction: Chronic, non-healing skin wounds such as diabetic foot ulcers (DFUs) are common in patients with type 2 diabetes mellitus (T2DM) and often result in limb amputation and even death. However, mechanisms by which T2DM and inflammation negatively impact skin wound healing remains poorly understood. Here we investigate a mechanism by which an excessive level of chemokine CCL28, through its receptor CCR10, impairs wound healing in patients and mice with T2DM. Methods & Results: Firstly, a higher level of CCL28 was observed in skin and plasma in both patients with T2DM, and in obesity-induced type 2 diabetic db/db mice. Compared with WT mice, adipose tissue from db/db mice released 50% more CCL28, as well as 2- to 3-fold more IL-1β, IL-6, and TNF-α, and less VEGF, as determined by ELISA measurements. Secondly, overexpression of CCL28 with adenovirus (Adv-CCL28) caused elevation of proinflammatory cytokines as well as CCR10 expression and also reduced eNOS expression in the dorsal skin of WT mice as compared with control Adv. Thirdly, topical application of neutralizing anti-CCL28 Ab dose-dependently accelerated wound closure and eNOS expression, and decreased IL-6 level, with an optimal dose of 1 μg/wound. In addition, mRNA levels of eNOS and anti-inflammatory cytokine IL-4 were increased as shown by real-time RT-PCR. The interaction between eNOS and CCR10 was significantly reduced in diabetic mouse wounds following application of the optimal dose of anti-CCL28 Ab, and eNOS expression increased. Finally, enhanced VEGF production and increased subdermal vessel density as indicated by CD31 immunostaining were also observed with anti-CCL28 Ab. Discussion: Taken together, topical application of neutralizing anti-CCL28 Ab improved dorsal skin wound healing by reducing CCR10 activation and inflammation in part by preventing eNOS downregulation, increasing VEGF production, and restoring angiogenesis. These results indicate anti-CCL28 Ab has significant potential as a therapeutic strategy for treatment of chronic non-healing diabetic skin wounds such as DFUs.
Collapse
Affiliation(s)
- Zhenlong Chen
- Department of Anesthesiology, College of Medicine, University of Illinois at Chicago, Chicago, IL, United States
| | - Jacob M. Haus
- School of Kinesiology, University of Michigan, Ann Arbor, MI, United States
| | - Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL, United States
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Timothy J. Koh
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL, United States
- Department of Kinesiology and Nutrition, College of Applied Health Sciences, University of Illinois at Chicago, Chicago, IL, United States
| | - Richard D. Minshall
- Department of Anesthesiology, College of Medicine, University of Illinois at Chicago, Chicago, IL, United States
- Department of Pharmacology and Regenerative Medicine, College of Medicine, University of Illinois at Chicago, Chicago, IL, United States
| |
Collapse
|
5
|
Chen Z, Haus JM, Chen L, Jiang Y, Sverdlov M, DiPietro LA, Xiong N, Wu SC, Koh TJ, Minshall RD. Inhibition of CCL28/CCR10-Mediated eNOS Downregulation Improves Skin Wound Healing in the Obesity-Induced Mouse Model of Type 2 Diabetes. Diabetes 2022; 71:2166-2180. [PMID: 35899992 PMCID: PMC9501665 DOI: 10.2337/db21-1108] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 07/21/2022] [Indexed: 11/13/2022]
Abstract
Chronic, nonhealing skin wounds, such as diabetic foot ulcers (DFUs), are common in patients with type 2 diabetes. Here, we investigated the role of chemokine (C-C motif) ligand 28 (CCL28) and its receptor C-C chemokine receptor type 10 (CCR10) in downregulation of endothelial nitric (NO) oxide synthase (eNOS) in association with delayed skin wound healing in the db/db mouse model of type 2 diabetes. We observed reduced eNOS expression and elevated CCL28/CCR10 levels in dorsal skin of db/db mice and subdermal leg biopsy specimens from human subjects with type 2 diabetes. Further interrogation revealed that overexpression of CCR10 reduced eNOS expression, NO bioavailability, and tube formation of human dermal microvascular endothelial cells (HDMVECs) in vitro, which was recapitulated in mouse dorsal skin. In addition, incubation of HDMVECs with CCL28 led to internalization of the CCR10/eNOS complex and colocalization with lysosome-associated membrane protein 1. Finally, topical application of myristoylated CCR10 binding domain 7 amino acid (Myr-CBD7) peptide prevented CCR10-eNOS interaction and subsequent eNOS downregulation, enhanced eNOS/NO levels, eNOS/VEGF-R2+ microvessel density, and blood perfusion, reduced inflammatory cytokine levels, and importantly, decreased wound healing time in db/db mice. Thus, endothelial cell CCR10 activation in genetically obese mice with type 2 diabetes promotes eNOS depletion and endothelial dysfunction, and targeted disruption of CCR10/eNOS interaction improves wound healing.
Collapse
Affiliation(s)
- Zhenlong Chen
- Department of Anesthesiology, University of Illinois at Chicago, Chicago, IL
| | - Jacob M. Haus
- School of Kinesiology, University of Michigan, Ann Arbor, MI
| | - Lin Chen
- Department of Periodontics, University of Illinois at Chicago, Chicago, IL
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL
| | - Ying Jiang
- Department of Pharmacology and Regenerative Medicine, University of Illinois at Chicago, Chicago, IL
| | - Maria Sverdlov
- Research Resources Center, Research Histology and Tissue Imaging Collaborative, University of Illinois at Chicago, Chicago, IL
| | - Luisa A. DiPietro
- Department of Periodontics, University of Illinois at Chicago, Chicago, IL
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL
| | - Na Xiong
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - Stephanie C. Wu
- Departments of Surgery and Stem Cell and Regenerative Medicine, Center for Lower Extremity Ambulatory Research, Dr. William M. Scholl College of Podiatric Medicine, Rosalind Franklin University of Medicine and Science, North Chicago, IL
| | - Timothy J. Koh
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL
- Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, IL
| | - Richard D. Minshall
- Department of Anesthesiology, University of Illinois at Chicago, Chicago, IL
- Department of Pharmacology and Regenerative Medicine, University of Illinois at Chicago, Chicago, IL
| |
Collapse
|
6
|
Leonardo TR, Chen L, DiPietro LA. Preparation of a murine oral palate wound healing model. STAR Protoc 2022; 3:101727. [PMID: 36170111 PMCID: PMC9526232 DOI: 10.1016/j.xpro.2022.101727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 07/28/2022] [Accepted: 08/31/2022] [Indexed: 01/26/2023] Open
Abstract
The oral cavity is a highly regenerative epithelial tissue that results in minimal scarring after injury. This protocol describes the preparation of a mouse palate wound model. The protocol includes steps to place an excisional wound on the mouse palate, followed by harvesting of wound tissue and bone decalcification. We detail how to overcome the technical challenge of limited anatomical space, avoid damaging the nasal cavity, manage bleeding, and collect tissue for downstream genomic or immunohistochemical analysis.
Collapse
Affiliation(s)
- Trevor R. Leonardo
- Department of Microbiology and Immunology, University of Illinois Chicago, Chicago, IL 60612, USA,Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, IL 60612, USA
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, IL 60612, USA
| | - Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, University of Illinois Chicago, Chicago, IL 60612, USA,Corresponding author
| |
Collapse
|
7
|
Abstract
Angiogenesis, or the growth of new blood vessels from the preexisting vasculature, is a visible and important component of wound repair. When tissue damage occurs, disruption of the vasculature structure leads to hypoxia. The restoration of normoxia is essential for appropriate and durable tissue repair. Angiogenesis in wounds is regulated by endogenous proangiogenic mediators, which cause rapid growth of a new vascular bed that is much denser than that of normal tissue. Such rapid growth of the capillary bed results in capillaries that are abnormal, and the newly formed vessels are tortuous, dilated, and immature. During wound resolution, this substantial neocapillary bed is pruned back to normal density with attendant maturation. Many poorly healing wounds, including nonhealing ulcers and scars, exhibit an aberrant angiogenic response. The fine-tuning of capillary regrowth in wounds is an area of significant therapeutic potential.
Collapse
Affiliation(s)
- Chen Han
- Center for Wound Healing and Tissue Regeneration, Colleges of Dentistry and Medicine, University of Illinois Chicago, Chicago, Illinois 60612, USA
| | - May Barakat
- Center for Wound Healing and Tissue Regeneration, Colleges of Dentistry and Medicine, University of Illinois Chicago, Chicago, Illinois 60612, USA
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, Colleges of Dentistry and Medicine, University of Illinois Chicago, Chicago, Illinois 60612, USA
| |
Collapse
|
8
|
Barakat M, DiPietro LA, Chen L. Limited Treatment Options for Diabetic Wounds: Barriers to Clinical Translation Despite Therapeutic Success in Murine Models. Adv Wound Care (New Rochelle) 2021; 10:436-460. [PMID: 33050829 PMCID: PMC8236303 DOI: 10.1089/wound.2020.1254] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 10/12/2020] [Indexed: 12/15/2022] Open
Abstract
Significance: Millions of people worldwide suffer from diabetes mellitus and its complications, including chronic diabetic wounds. To date, there are few widely successful clinical therapies specific to diabetic wounds beyond general wound care, despite the vast number of scientific discoveries in the pathogenesis of defective healing in diabetes. Recent Advances: In recent years, murine animal models of diabetes have enabled the investigation of many possible therapeutics for diabetic wound care. These include specific cell types, growth factors, cytokines, peptides, small molecules, plant extracts, microRNAs, extracellular vesicles, novel wound dressings, mechanical interventions, bioengineered materials, and more. Critical Issues: Despite many research discoveries, few have been translated from their success in murine models to clinical use in humans. This massive gap between bench discovery and bedside application begs the simple and critical question: what is still missing? The complexity and multiplicity of the diabetic wound makes it an immensely challenging therapeutic target, and this lopsided progress highlights the need for new methods to overcome the bench-to-bedside barrier. How can laboratory discoveries in animal models be effectively translated to novel clinical therapies for human patients? Future Directions: As research continues to decipher deficient healing in diabetes, new approaches and considerations are required to ensure that these discoveries can become translational, clinically usable therapies. Clinical progress requires the development of new, more accurate models of the human disease state, multifaceted investigations that address multiple critical components in wound repair, and more innovative research strategies that harness both the existing knowledge and the potential of new advances across disciplines.
Collapse
Affiliation(s)
- May Barakat
- Center for Wound Repair and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Luisa A. DiPietro
- Center for Wound Repair and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Lin Chen
- Center for Wound Repair and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois, USA
| |
Collapse
|
9
|
Romana-Souza B, Chen L, Leonardo TR, Chen Z, DiPietro LA. Dermal fibroblast phagocytosis of apoptotic cells: A novel pathway for wound resolution. FASEB J 2021; 35:e21443. [PMID: 33749877 PMCID: PMC8670562 DOI: 10.1096/fj.202002078r] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 01/20/2021] [Accepted: 02/01/2021] [Indexed: 01/23/2023]
Abstract
The effective clearance of apoptotic cells is an essential step in the resolution of healing wounds. In particular, blood vessel regression during wound resolution produces a significant number of apoptotic endothelial cells (ApoEC) that must be cleared. In considering the fate of ApoEC and the presence of fibroblasts during wound resolution, we hypothesized that fibroblasts might serve as phagocytes involved in endothelial cell removal. The current study investigated whether dermal fibroblasts engulf ApoEC, whether this uptake alters the phenotype of dermal fibroblasts, and the biological molecules involved. In both in vitro and in vivo studies, following ApoEC engulfment, fibroblasts acquired a pro-healing phenotype (increased cell migration, contractility, α-smooth muscle actin expression, and collagen deposition). In addition, fibroblast uptake of ApoEC was shown to be mediated in part by the milk fat globule-EGF factor 8 protein/integrin αv β5 pathway. Our study demonstrates a novel function of fibroblasts in the clearance of ApoEC and suggests that this capability has significant implications for tissue repair and fibrosis.
Collapse
Affiliation(s)
- Bruna Romana-Souza
- Tissue Repair Laboratory, Rio de Janeiro State University, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Trevor R. Leonardo
- Department of Microbiology and Immunology, College of Medicine, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Zhenlong Chen
- Department of Anesthesiology, University of Illinois at Chicago, Chicago, IL, USA
| | - Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL 60612, USA
| |
Collapse
|
10
|
Abstract
In healing wounds, the regression of blood vessels during the resolution phase creates a significant number of apoptotic endothelial cells (ApoECs). Surprisingly few studies have investigated the fate of apoECs in wounds, or the consequence of their removal. The current study employed both in vitro and in vivo models to investigate if macrophages ingest apoECs and to determine if such phagocytosis alters macrophage phenotype. To examine the capability of macrophages to ingest apoECs in in vivo wounds, pHrodo green labeled apoECs were injected into skin wounds 6 days after injury. The results demonstrated that 2.2% of macrophages in the wounds had engulfed apoECs 24 hours after injection. Macrophages that had engulfed apoECs expressed the markers CD80 (100%), CD86 (93.8%), and CD163 (22.8%), while no expression of CD206 marker was observed. In in vitro studies, 76.1% and 81.1% of PMA differentiated THP-1 macrophages engulfed apoECs at 6 and 24 hours, respectively. mRNA expression levels of IL-1β, iNOS, and TGF-β1 decreased in THP-1 macrophages after exposure to apoECs, while the expression of IL-6 increased. THP-1 macrophages that were incubated with apoECs for 6hours expressed CD80 (30.2%), CD163 (62.9%), and CD206 (45.3%), while expression levels in untreated group were 0.5%, 45.0%, and 2.4%, respectively. Taken together, our studies showed that macrophages phagocytize dermal apoECs both in vitro and in vivo. The engulfment of apoECs leads to a unique macrophage phenotype, which has characteristics of both M1 and M2 macrophage phenotypes. These findings provide a new mechanism by which macrophage phenotypes can be modified during wound resolution.
Collapse
Affiliation(s)
- Mingyuan Xu
- Department of Plastic Surgery, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Zhenlong Chen
- Departments of Anesthesiology, College of Medicine, University of Illinois at Chicago, Chicago, USA
| | - Kevin Chen
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, USA
| | - Da Ma
- Guangdong Provincial Key Laboratory of Stomatology, Stomatological Hospital, Guanghua School of Stomatology, SunYat-sen University, Guangzhou, Guangdong, China
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, USA
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, USA
| |
Collapse
|
11
|
Abstract
Macrophages are prominent cells in normally healing adult skin wounds, yet their exact functions and functional significance to healing outcomes remain enigmatic. Many functional attributes are ascribed to wound macrophages, including host defense and support of the proliferation of new tissue to replace that lost by injury. Indeed, the depletion of macrophages is unmistakably detrimental to normal skin healing in adult mammals. Yet in certain systems, dermal wounds seem to heal well with limited or even no functional macrophages, creating an apparent paradox regarding the function of this cell in wounds. Recent advances in our understanding of wound macrophage phenotypes, along with new information about cellular plasticity in wounds, may provide some explanation for the apparently contradictory findings and suggest new paradigms regarding macrophage function in wounds. Continued study of this remarkable cell is needed to develop effective therapeutic options to improve healing outcomes.
Collapse
Affiliation(s)
- Luisa A. DiPietro
- College of Dentistry, University of Illinois at Chicago, 801 S. Paulina, Chicago, IL 60612, USA
| | - Traci A. Wilgus
- Department of Pathology, The Ohio State University, 129 Hamilton Hall, 1645 Neil Ave, Columbus, OH 43210, USA;
| | - Timothy J. Koh
- College of Applied Health Sciences, University of Illinois at Chicago, 1919 W. Taylor, Chicago, IL 60612, USA;
| |
Collapse
|
12
|
Ma D, Chen L, Shi J, Zhao Y, Vasani S, Chen K, Romana‐Souza B, Henkin J, DiPietro LA. Pigment epithelium‐derived factor attenuates angiogenesis and collagen deposition in hypertrophic scars. Wound Repair Regen 2020; 28:684-695. [DOI: 10.1111/wrr.12828] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 04/28/2020] [Accepted: 05/05/2020] [Indexed: 12/15/2022]
Affiliation(s)
- Da Ma
- Guangdong Provincial Key Laboratory of Stomatology, Stomatological Hospital Guanghua School of Stomatology, SunYat‐sen University Guangzhou Guangdong China
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry University of Illinois at Chicago Chicago Illinois USA
| | - Junhe Shi
- Center for Wound Healing and Tissue Regeneration, College of Dentistry University of Illinois at Chicago Chicago Illinois USA
| | - Yan Zhao
- Center for Wound Healing and Tissue Regeneration, College of Dentistry University of Illinois at Chicago Chicago Illinois USA
| | - Shruti Vasani
- Center for Wound Healing and Tissue Regeneration, College of Dentistry University of Illinois at Chicago Chicago Illinois USA
| | - Kevin Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry University of Illinois at Chicago Chicago Illinois USA
| | - Bruna Romana‐Souza
- Tissue Repair Laboratory State University of Rio de Janeiro Rio de Janeiro Brazil
| | - Jack Henkin
- Center for Developmental Therapeutics and Department of Chemistry Northwestern University Evanston Illinois USA
| | - Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry University of Illinois at Chicago Chicago Illinois USA
| |
Collapse
|
13
|
Okonkwo UA, Chen L, Ma D, Haywood VA, Barakat M, Urao N, DiPietro LA. Compromised angiogenesis and vascular Integrity in impaired diabetic wound healing. PLoS One 2020; 15:e0231962. [PMID: 32324828 PMCID: PMC7179900 DOI: 10.1371/journal.pone.0231962] [Citation(s) in RCA: 79] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 04/03/2020] [Indexed: 12/19/2022] Open
Abstract
Vascular deficits are a fundamental contributing factor of diabetes-associated diseases. Although previous studies have demonstrated that the pro-angiogenic phase of wound healing is blunted in diabetes, a comprehensive understanding of the mechanisms that regulate skin revascularization and capillary stabilization in diabetic wounds is lacking. Using a mouse model of diabetic wound healing, we performed microCT analysis of the 3-dimensional architecture of the capillary bed. As compared to wild type, vessel surface area, branch junction number, total vessel length, and total branch number were significantly decreased in wounds of diabetic mice as compared to WT mice. Diabetic mouse wounds also had significantly increased capillary permeability and decreased pericyte coverage of capillaries. Diabetic wounds exhibited significant perturbations in the expression of factors that affect vascular regrowth, maturation and stability. Specifically, the expression of VEGF-A, Sprouty2, PEDF, LRP6, Thrombospondin 1, CXCL10, CXCR3, PDGFR-β, HB-EGF, EGFR, TGF-β1, Semaphorin3a, Neuropilin 1, angiopoietin 2, NG2, and RGS5 were down-regulated in diabetic wounds. Together, these studies provide novel information about the complexity of the perturbation of angiogenesis in diabetic wounds. Targeting factors responsible for wound resolution and vascular pruning, as well those that affect pericyte recruitment, maturation, and stability may have the potential to improve diabetic skin wound healing.
Collapse
Affiliation(s)
- Uzoagu A. Okonkwo
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL, United States of America
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL, United States of America
| | - Da Ma
- Guangdong Provincial Key Laboratory of Stomatology, Stomatological Hospital, Guanghua School of Stomatology, SunYat-sen University, Guangzhou, Guangdong, China
| | - Veronica A. Haywood
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL, United States of America
| | - May Barakat
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL, United States of America
| | - Norifumi Urao
- Department of Pharmacology, Upstate Medical University, Syracuse, NY, United States of America
| | - Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL, United States of America
- * E-mail:
| |
Collapse
|
14
|
de Castro JR, da Silva Pereira F, Chen L, Arana-Chavez VE, Ballester RY, DiPietro LA, Simões A. Improvement of full-thickness rat skin wounds by photobiomodulation therapy (PBMT): A dosimetric study. J Photochem Photobiol B 2020; 206:111850. [PMID: 32203726 DOI: 10.1016/j.jphotobiol.2020.111850] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 02/06/2020] [Accepted: 03/04/2020] [Indexed: 11/19/2022]
Abstract
Basic dosimetric studies are necessary to support the use of photobiomodulation therapy (PBMT), since the great variety of laser parameters that are reported in the literature have created an obstacle to identifying reproducible results. Thus, the present study evaluates the process of tissue repair after the photobiomodulation therapy, taking into consideration the dose, frequency and the mode of energy delivery used. For this, 6 mm diameter wounds were created on dorsal skin of Wistar rats, and the animals were divided in control and irradiated groups, where L1 and L4 (irradiated with 1 point of 10 J/cm2), L2 and L5 (5 points of 10 J/cm2), L3 and L6 (1 point of 50 J/cm2), respectively for one or multiple days of irradiations. A diode laser, λ 660 nm, 40 mW of power and 0.028 cm2 of spot area was used. Our data showed that the group receiving multiple treatments over the first week post wounding, applied at 10 J/cm2 at each of 5 points on and around the wound (group L5) presented the best improvement of wound closure, higher cytokeratin 10, lower macrophage infiltration, and greater tissue resistance to rupture. We conclude that PBMT improves the skin wound healing process, and the outcomes were directly related to the chosen laser parameters and irradiation mode.
Collapse
Affiliation(s)
- Juliana Rodrigues de Castro
- Laboratory of Oral Biology, Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, 05508-000, Brazil
| | - Filipi da Silva Pereira
- Laboratory of Oral Biology, Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, 05508-000, Brazil
| | - Lin Chen
- Center for Wound Healing & Tissue Regeneration, Department of Periodontics, College of Dentistry, University of Illinois at Chicago, USA
| | - Victor Elias Arana-Chavez
- Laboratory of Oral Biology, Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, 05508-000, Brazil
| | - Rafael Yagüe Ballester
- Laboratory of Oral Biology, Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, 05508-000, Brazil
| | - Luisa A DiPietro
- Center for Wound Healing & Tissue Regeneration, Department of Periodontics, College of Dentistry, University of Illinois at Chicago, USA
| | - Alyne Simões
- Laboratory of Oral Biology, Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, 05508-000, Brazil.
| |
Collapse
|
15
|
Huang CC, Kang M, Narayanan R, DiPietro LA, Cooper LF, Gajendrareddy P, Ravindran S. Evaluating the Endocytosis and Lineage-Specification Properties of Mesenchymal Stem Cell Derived Extracellular Vesicles for Targeted Therapeutic Applications. Front Pharmacol 2020; 11:163. [PMID: 32194405 PMCID: PMC7063066 DOI: 10.3389/fphar.2020.00163] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 02/07/2020] [Indexed: 12/13/2022] Open
Abstract
Mesenchymal stem cells (MSCs) are multipotent cells with regenerative and immunomodulatory properties. Several aspects of MSC function have been attributed to the paracrine effects of MSC derived extracellular vesicles (EVs). Although MSC EVs show great promise for regenerative medicine applications, insights into their uptake mechanisms by different target cells and the ability to control MSC EV properties for defined function in vivo have remained elusive knowledge gaps. The primary goal of this study is to elucidate how the basic properties of MSC derived EVs can be exploited for function-specific activity in regenerative medicine. Our first important observation is that, MSC EVs possess a common mechanism of endocytosis across multiple cell types. Second, altering the MSC state by inducing differentiation into multiple lineages did not affect the exosomal properties or endocytosis but triggered the expression of lineage-specific genes and proteins in vitro and in vivo respectively. Overall, the results presented in this study show a common mechanism of endocytosis for MSC EVs across different cell types and the feasibility to generate functionally enhanced EVs by modifications to parental MSCs.
Collapse
Affiliation(s)
- Chun-Chieh Huang
- Department of Oral Biology, College of Dentistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Miya Kang
- Department of Oral Biology, College of Dentistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Raghuvaran Narayanan
- Department of Oral Biology, College of Dentistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Luisa A DiPietro
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Lyndon F Cooper
- Department of Oral Biology, College of Dentistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Praveen Gajendrareddy
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Sriram Ravindran
- Department of Oral Biology, College of Dentistry, University of Illinois at Chicago, Chicago, IL, United States
| |
Collapse
|
16
|
Bogachkov YY, Chen L, Le Master E, Fancher IS, Zhao Y, Aguilar V, Oh MJ, Wary KK, DiPietro LA, Levitan I. LDL induces cholesterol loading and inhibits endothelial proliferation and angiogenesis in Matrigels: correlation with impaired angiogenesis during wound healing. Am J Physiol Cell Physiol 2020; 318:C762-C776. [PMID: 31995410 DOI: 10.1152/ajpcell.00495.2018] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Hypercholesterolemia is a major risk factor for adverse cardiovascular outcomes, but its effect on angiogenesis and wound healing is not well understood. In this study, using a combination of mass spectrometry and laurdan two-photon imaging, we show that elevated levels of low-density lipoprotein (LDL), like those seen in hypercholesterolemic patients, lead to an increase in both free cholesterol and cholesterol esters, as well as increase in lipid order of endothelial cell membranes. Notably, these effects are distinct and opposite to the lack of cholesterol loading and the disruption of lipid order observed in our earlier studies in response to oxidized LDL (oxLDL). The same pathological level of LDL leads to a significant inhibition of endothelial proliferation and cell cycle arrest in G2/M phase, whereas oxLDL enhances endothelial proliferation in S phase of the cycle. LDL but not oxLDL suppresses the expression of vascular endothelial growth factor receptor-2 while enhancing the expression of vascular endothelial growth factor (VEGF). Furthermore, we show that aged (8-10 mo) hypercholesterolemic apolipoprotein E-deficient (ApoE-/-) mice display delayed wound closure compared with age-matched C57/BL6 wild-type controls following a skin punch biopsy. The delay in wound healing is associated with a decreased expression of cluster of differentiation 31 platelet endothelial cell adhesion molecule endothelial marker and decreased angiogenesis within the wound bed. Furthermore, decreased endothelial responsiveness to the growth factors VEGF and basic fibroblast growth factor is observed in ApoE-/- mice in Matrigel plugs and in Matrigels with high levels of LDL in wild-type mice. We propose that plasma hypercholesterolemia is antiangiogenic due to elevated levels of LDL.
Collapse
Affiliation(s)
- Yedida Y Bogachkov
- Division of Pulmonary and Critical Care, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois.,Department of Cellular and Molecular Pharmacology, University of Illinois at Chicago, Chicago, Illinois
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Elizabeth Le Master
- Division of Pulmonary and Critical Care, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois
| | - Ibra S Fancher
- Division of Pulmonary and Critical Care, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois
| | - Yan Zhao
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Victor Aguilar
- Division of Pulmonary and Critical Care, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois
| | - Myung-Jin Oh
- Division of Pulmonary and Critical Care, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois
| | - Kishore K Wary
- Department of Cellular and Molecular Pharmacology, University of Illinois at Chicago, Chicago, Illinois
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Irena Levitan
- Division of Pulmonary and Critical Care, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois.,Department of Cellular and Molecular Pharmacology, University of Illinois at Chicago, Chicago, Illinois
| |
Collapse
|
17
|
Michalczyk ER, Chen L, Maia MB, DiPietro LA. A Role for Low-Density Lipoprotein Receptor-Related Protein 6 in Blood Vessel Regression in Wound Healing. Adv Wound Care (New Rochelle) 2020; 9:1-8. [PMID: 31871825 PMCID: PMC6918844 DOI: 10.1089/wound.2019.1019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Accepted: 10/25/2019] [Indexed: 01/22/2023] Open
Abstract
Objective: The healing of skin wounds is typified by a pattern of robust angiogenesis followed by vascular regression. Pigment epithelium-derived factor (PEDF), a recognized endogenous antiangiogenic protein, regulates vascular regression in resolving wounds through an unknown receptor. Among the multiple receptors for PEDF that have been identified, low-density lipoprotein receptor-related protein 6 (Lrp6) has been described as a regulator of angiogenesis in multiple systems. The purpose of the current study was to determine if the Lrp6 receptor plays a role in vessel regression in wounds. Approach: Excisional skin wounds were prepared on C57BL/6 mice. RT-PCR and immunoblots were performed to measure Lrp6 expression over a time course of wound healing. Immunohistochemistry was performed to localize Lrp6 in both recombinant PEDF (rPEDF)-treated and control wounds. To examine whether Lrp6 is critical to the regulation of capillary regression in vivo, wounds were treated with Lrp6 siRNA to minimize its presence in wounds. Immunohistochemistry for CD31 was performed to quantify blood vessel density. Results: PCR and immunoblots revealed significant increases in Lrp6 expression during the vascular regression phase of wound healing. Lrp6 was found to colocalize with CD31+ endothelial cells in wounds. The addition of rPEDF to wounds caused an increase in Lrp6-CD31+ endothelial cell colocalization. Inhibition of Lrp6 by siRNA impeded the vascular regression phase of healing. Innovation: This study is the first to demonstrate an association between Lrp6 and vessel regression in wound healing. Conclusion: Lrp6 is expressed in wounds in a temporal and spatial manner that suggests it may be a receptor for PEDF during vascular regression. PEDF increases Lrp6 expression in the wound vasculature, and inhibition of Lrp6 blocked vascular regression in wounds. The results suggest that Lrp6 is important to vascular regression in wounds, possibly through direct interaction with PEDF.
Collapse
Affiliation(s)
- Elizabeth R. Michalczyk
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Mariana B. Maia
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| |
Collapse
|
18
|
Chen L, Simões A, Chen Z, Zhao Y, Wu X, Dai Y, DiPietro LA, Zhou X. Overexpression of the Oral Mucosa-Specific microRNA-31 Promotes Skin Wound Closure. Int J Mol Sci 2019; 20:ijms20153679. [PMID: 31357577 PMCID: PMC6696114 DOI: 10.3390/ijms20153679] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 07/25/2019] [Accepted: 07/26/2019] [Indexed: 02/06/2023] Open
Abstract
Wounds within the oral mucosa are known to heal more rapidly than skin wounds. Recent studies suggest that differences in the microRNAome profiles may underlie the exceptional healing that occurs in oral mucosa. Here, we test whether skin wound-healing can be accelerating by increasing the levels of oral mucosa-specific microRNAs. A panel of 57 differentially expressed high expresser microRNAs were identified based on our previously published miR-seq dataset of paired skin and oral mucosal wound-healing [Sci. Rep. (2019) 9:7160]. These microRNAs were further grouped into 5 clusters based on their expression patterns, and their differential expression was confirmed by TaqMan-based quantification of LCM-captured epithelial cells from the wound edges. Of these 5 clusters, Cluster IV (consisting of 8 microRNAs, including miR-31) is most intriguing due to its tissue-specific expression pattern and temporal changes during wound-healing. The in vitro functional assays show that ectopic transfection of miR-31 consistently enhanced keratinocyte proliferation and migration. In vivo, miR-31 mimic treatment led to a statistically significant acceleration of wound closure. Our results demonstrate that wound-healing can be enhanced in skin through the overexpression of microRNAs that are highly expressed in the privileged healing response of the oral mucosa.
Collapse
Affiliation(s)
- Lin Chen
- Center for Wound Healing & Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Alyne Simões
- Center for Wound Healing & Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA
- Oral Biology Laboratory, Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, 05508-000 São Paulo, SP, Brazil
| | - Zujian Chen
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Yan Zhao
- Center for Wound Healing & Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Xinming Wu
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Yang Dai
- Department of Bioengineering, College of Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA
- Graduate College, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Luisa A DiPietro
- Center for Wound Healing & Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA.
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA.
- Graduate College, University of Illinois at Chicago, Chicago, IL 60607, USA.
| | - Xiaofeng Zhou
- Center for Wound Healing & Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA.
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612, USA.
- Graduate College, University of Illinois at Chicago, Chicago, IL 60607, USA.
- UIC Cancer Center, University of Illinois at Chicago, Chicago, IL 60612, USA.
| |
Collapse
|
19
|
Nagaraja S, Chen L, DiPietro LA, Reifman J, Mitrophanov AY. Predictive Approach Identifies Molecular Targets and Interventions to Restore Angiogenesis in Wounds With Delayed Healing. Front Physiol 2019; 10:636. [PMID: 31191342 PMCID: PMC6547939 DOI: 10.3389/fphys.2019.00636] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 05/06/2019] [Indexed: 12/29/2022] Open
Abstract
Impaired angiogenesis is a hallmark of wounds with delayed healing, and currently used therapies to restore angiogenesis have limited efficacy. Here, we employ a computational simulation-based approach to identify influential molecular and cellular processes, as well as protein targets, whose modulation may stimulate angiogenesis in wounds. We developed a mathematical model that captures the time courses for platelets, 9 cell types, 29 proteins, and oxygen, which are involved in inflammation, proliferation, and angiogenesis during wound healing. We validated our model using previously published experimental data. By performing global sensitivity analysis on thousands of simulated wound-healing scenarios, we identified six processes (among the 133 modeled in total) whose modulation may improve angiogenesis in wounds. By simulating knockouts of 25 modeled proteins and by simulating different wound-oxygenation levels, we identified four proteins [namely, transforming growth factor (TGF)-β, vascular endothelial growth factor (VEGF), fibroblast growth factor-2 (FGF-2), and angiopoietin-2 (ANG-2)], as well as oxygen, as therapeutic targets for stimulating angiogenesis in wounds. Our modeling results indicated that simultaneous inhibition of TGF-β and supplementation of either FGF-2 or ANG-2 could be more effective in stimulating wound angiogenesis than the modulation of either protein alone. Our findings suggest experimentally testable intervention strategies to restore angiogenesis in wounds with delayed healing.
Collapse
Affiliation(s)
- Sridevi Nagaraja
- Department of Defense, Biotechnology High Performance Computing Software Applications Institute, Telemedicine and Advanced Technology Research Center, United States Army Medical Research and Materiel Command, Fort Detrick, MD, United States.,The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD, United States
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Jaques Reifman
- Department of Defense, Biotechnology High Performance Computing Software Applications Institute, Telemedicine and Advanced Technology Research Center, United States Army Medical Research and Materiel Command, Fort Detrick, MD, United States
| | - Alexander Y Mitrophanov
- Department of Defense, Biotechnology High Performance Computing Software Applications Institute, Telemedicine and Advanced Technology Research Center, United States Army Medical Research and Materiel Command, Fort Detrick, MD, United States.,The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD, United States
| |
Collapse
|
20
|
Simões A, Chen L, Chen Z, Zhao Y, Gao S, Marucha PT, Dai Y, DiPietro LA, Zhou X. Differential microRNA profile underlies the divergent healing responses in skin and oral mucosal wounds. Sci Rep 2019; 9:7160. [PMID: 31073224 PMCID: PMC6509259 DOI: 10.1038/s41598-019-43682-w] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Accepted: 04/27/2019] [Indexed: 12/31/2022] Open
Abstract
Oral mucosal wounds heal faster than skin wounds, yet the role of microRNAs in this differential healing has never been examined. To delineate the role of microRNAs in this site-specific injury response, we first compared the microRNAome of uninjured skin and oral mucosa in mice. A total of 53 tissue-specific microRNAs for skin and oral mucosa epithelium were identified. The most striking difference was the high abundance of miR-10a/b in skin (accounting for 21.10% of the skin microRNAome) as compared to their low expression in oral mucosa (2.87%). We further examined the dynamic changes of microRNAome throughout the time course of skin and oral mucosal wound healing. More differentially expressed microRNAs were identified in skin wounds than oral wounds (200 and 33, respectively). More specifically, miR-10a/b was significantly down-regulated in skin but not oral wounds. In contrast, up-regulation of miR-21 was observed in both skin and oral wounds. The therapeutic potential of miR-10b and miR-21 in accelerating wound closure was demonstrated in in vitro assays and in a murine skin wound model. Thus, we provided the first site-specific microRNA profile of skin and oral mucosal wound healing, and demonstrate the feasibility of a microRNA-based therapy for promoting wound closure.
Collapse
Affiliation(s)
- Alyne Simões
- Center for Wound Healing & Tissue Regeneration, Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA.,Oral Biology Laboratory, Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil
| | - Lin Chen
- Center for Wound Healing & Tissue Regeneration, Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
| | - Zujian Chen
- Center for Molecular Biology of Oral Diseases, Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
| | - Yan Zhao
- Center for Wound Healing & Tissue Regeneration, Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
| | - Shang Gao
- Department of Bioengineering, College of Engineering, University of Illinois at Chicago, Chicago, IL, USA
| | - Phillip T Marucha
- Center for Wound Healing & Tissue Regeneration, Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA.,College of Dentistry, Oregon Health and Sciences University, Portland, OR, USA
| | - Yang Dai
- Department of Bioengineering, College of Engineering, University of Illinois at Chicago, Chicago, IL, USA
| | - Luisa A DiPietro
- Center for Wound Healing & Tissue Regeneration, Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA. .,Graduate College, University of Illinois at Chicago, Chicago, IL, USA.
| | - Xiaofeng Zhou
- Center for Wound Healing & Tissue Regeneration, Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA. .,Center for Molecular Biology of Oral Diseases, Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA. .,Graduate College, University of Illinois at Chicago, Chicago, IL, USA. .,UIC Cancer Center, University of Illinois at Chicago, Chicago, IL, USA.
| |
Collapse
|
21
|
Leong J, Seo Y, Chu SH, Park C, Jeon EJ, Cho SW, Yang YY, DiPietro LA, Kim DH, Kong H. Pore Diameter of Mesoporous Silica Modulates Oxidation of H 2O 2-Sensing Chromophore in a Porous Matrix. Langmuir 2018; 34:11242-11252. [PMID: 30173514 DOI: 10.1021/acs.langmuir.8b00957] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Hydrogen peroxide (H2O2) is an attractive chemical because of its bleaching properties in paper and pulp industry and as a disinfectant in the food, water, and medical industries. However, it is important to monitor the residual H2O2 level after its usage and prevent any unintended health problems or chemical reactions. Most H2O2 sensors often utilize fluorophores or electrical circuitry that requires an additional irradiation or a digital display. To this end, this study presents a 3,3',5,5'-tetramethylbenzidine (TMB)/horseradish peroxidase (HRP)-loaded patch that alerts the presence of high H2O2 levels by generating a visible blue color. We hypothesized that water-insoluble TMB immobilized within mesoporous silica particles of proper pore diameter and structure would act as a colorimetric indicator through the H2O2-mediated oxidation within a cross-linked patch. We examined this hypothesis by immobilizing TMB molecules in mesoporous silica particles with 2 and 7 nm diameter cylindrical pores as well as on nonporous silica particles. Then, we loaded these TMB-silica particles and HRP in a porous alginate patch via sequential in situ cross-linking reaction and lyophilization. In the presence of 25-5000 μM H2O2, which simulate H2O2 concentrations found in residual disinfecting fluids, the patch loaded with TMB-mesoporous silica particles with 7 nm diameter pores generated a distinct blue color with varying intensities depending on the H2O2 concentration. The design principles demonstrated in this study should be applicable to a broad array of sensors to be integrated into a moldable, three-dimensional matrix.
Collapse
Affiliation(s)
- Jiayu Leong
- Institute of Bioengineering and Nanotechnology , 31 Biopolis Way , Singapore 138669 , Singapore
| | | | - Sang-Hyon Chu
- National Institute of Aerospace , 100 Exploration Way , Hampton , Virginia 23666 , United States
| | - Cheol Park
- Advanced Materials and Processing Branch , NASA Langley Research Center , Hampton , Virginia 23681 , United States
| | - Eun Je Jeon
- Department of Biotechnology , Yonsei University , Seoul 03722 , Republic of Korea
| | - Seung-Woo Cho
- Department of Biotechnology , Yonsei University , Seoul 03722 , Republic of Korea
| | - Yi Yan Yang
- Institute of Bioengineering and Nanotechnology , 31 Biopolis Way , Singapore 138669 , Singapore
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry , University of Illinois at Chicago , Chicago , Illinois 60612 , United States
| | - Dong Hyun Kim
- Department of Human and Culture Convergence Technology R&BD Group , Korea Institute of Industrial Technology , Ansan-si , Gyeonggi-do 426-910 , Republic of Korea
| | | |
Collapse
|
22
|
Michalczyk ER, Chen L, Fine D, Zhao Y, Mascarinas E, Grippo PJ, DiPietro LA. Pigment Epithelium-Derived Factor (PEDF) as a Regulator of Wound Angiogenesis. Sci Rep 2018; 8:11142. [PMID: 30042381 PMCID: PMC6057962 DOI: 10.1038/s41598-018-29465-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 07/10/2018] [Indexed: 12/15/2022] Open
Abstract
Although the inflammatory and proliferative phases of wound healing have been well described, much less is known about how healing resolves. During the resolution phase, pruning of the capillary bed and maturation of capillaries occurs and influences the final strength and fidelity of the wound. PEDF, an endogenous anti-angiogenic factor, is produced in wounds and may contribute to the removal of capillaries during wound resolution. This study utilized PEDF-/- mice to examine how PEDF influences wound angiogenesis, particularly capillary density and permeability. The absence of PEDF led to transient changes in dermal wound closure and collagen content, but caused substantial changes in wound angiogenesis. Compared to wild type (WT) mice, wounds from PEDF-/- mice exhibited a significant increase in capillaries during the proangiogenic phase of repair, and a delay in capillary pruning. Conversely, the addition of rPEDF caused a reduction in capillary density within skin wounds in WT mice. In vitro studies showed that PEDF inhibited migration and tube formation by dermal microvascular endothelial cells, and caused a decrease in the expression of VEGFR2, VCAM-1, and other surface receptors. The results demonstrate that loss of PEDF causes a distinctive wound healing phenotype that is characterized by increased angiogenesis and delayed resolution. The findings suggest that PEDF most likely acts through multiple mechanisms to regulate proper capillary refinement in wounds.
Collapse
Affiliation(s)
- Elizabeth R Michalczyk
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
| | - David Fine
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
| | - Yan Zhao
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
| | - Emman Mascarinas
- Division of Gastroenterology and Hepatology, Department of Medicine, College of Medicine, University of Illinois at Chicago, Chicago, IL, USA
| | - Paul J Grippo
- Division of Gastroenterology and Hepatology, Department of Medicine, College of Medicine, University of Illinois at Chicago, Chicago, IL, USA
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA.
| |
Collapse
|
23
|
Zhao J, Cao Y, DiPietro LA, Liang J. Dynamic cellular finite-element method for modelling large-scale cell migration and proliferation under the control of mechanical and biochemical cues: a study of re-epithelialization. J R Soc Interface 2017; 14:rsif.2016.0959. [PMID: 28404867 DOI: 10.1098/rsif.2016.0959] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 03/15/2017] [Indexed: 01/07/2023] Open
Abstract
Computational modelling of cells can reveal insight into the mechanisms of the important processes of tissue development. However, current cell models have limitations and are challenged to model detailed changes in cellular shapes and physical mechanics when thousands of migrating and interacting cells need to be modelled. Here we describe a novel dynamic cellular finite-element model (DyCelFEM), which accounts for changes in cellular shapes and mechanics. It also models the full range of cell motion, from movements of individual cells to collective cell migrations. The transmission of mechanical forces regulated by intercellular adhesions and their ruptures are also accounted for. Intra-cellular protein signalling networks controlling cell behaviours are embedded in individual cells. We employ DyCelFEM to examine specific effects of biochemical and mechanical cues in regulating cell migration and proliferation, and in controlling tissue patterning using a simplified re-epithelialization model of wound tissue. Our results suggest that biochemical cues are better at guiding cell migration with improved directionality and persistence, while mechanical cues are better at coordinating collective cell migration. Overall, DyCelFEM can be used to study developmental processes when a large population of migrating cells under mechanical and biochemical controls experience complex changes in cell shapes and mechanics.
Collapse
Affiliation(s)
- Jieling Zhao
- Department of Bioengineering, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
| | - Youfang Cao
- Theoretical Biology and Biophysics (T-6), Center for Nonlinear Studies (CNLS), Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
| | - Jie Liang
- Department of Bioengineering, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
| |
Collapse
|
24
|
Abstract
Significance: Inflammation is an integral part of immune response and supports optimal wound healing in adults. Inflammatory cells such as neutrophils, macrophages, dendritic cells, lymphocytes, and mast cells produce important cytokines, chemokines, and growth factors. These immune cells interact with keratinocytes, fibroblasts, and endothelial cells (ECs), as well as the extracellular matrix within a complicated network that promotes and regulates wound healing. Aberrant and persistent inflammation may result in delayed wound healing, scar formation, or chronic wounds. Targeting the molecules involved in the inflammatory response may have great potential therapeutic value. Recent Advances and Critical Issues: Toll-like receptors (TLRs) are pattern recognition receptors that recognize pathogen-associated molecular patterns from microbes or danger-associated molecular patterns from damaged cells. The discovery of TLRs sheds new light on the mechanism by which the inflammatory or innate immune response is initiated in wound healing. Convincing evidence now shows that multiple types of cells, including infiltrating or resident inflammatory cells, keratinocytes, fibroblasts, and ECs, express specific types of TLRs. Experimental reduction of certain TLRs or treatment of wounds with TLR ligands has been shown to affect wound healing. A better understanding of the involvement of TLRs in the innate immune response during skin wound healing may suggest novel strategies to improve the quality of tissue repair. Future Directions: Despite the indisputable role of TLRs in regulating the immune response in acute wound healing, the functions of TLRs that are relevant to human wound healing and chronic wounds are poorly understood.
Collapse
Affiliation(s)
- Lin Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| |
Collapse
|
25
|
Abstract
Diabetes Mellitus Type II (DM2) is a growing international health concern with no end in sight. Complications of DM2 involve a myriad of comorbidities including the serious complications of poor wound healing, chronic ulceration, and resultant limb amputation. In skin wound healing, which has definite, orderly phases, diabetes leads to improper function at all stages. While the etiology of chronic, non-healing diabetic wounds is multi-faceted, the progression to a non-healing phenotype is closely linked to poor vascular networks. This review focuses on diabetic wound healing, paying special attention to the aberrations that have been described in the proliferative, remodeling, and maturation phases of wound angiogenesis. Additionally, this review considers therapeutics that may offer promise to better wound healing outcomes.
Collapse
Affiliation(s)
- Uzoagu A Okonkwo
- Department of Microbiology and Immunology, University of Illinois at Chicago College of Medicine, Chicago, IL 60612, USA.
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago College of Dentistry, Chicago, IL 60612, USA.
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago College of Dentistry, Chicago, IL 60612, USA.
| |
Collapse
|
26
|
Chen L, Nagaraja S, Zhou J, Zhao Y, Fine D, Mitrophanov AY, Reifman J, DiPietro LA. Wound healing in Mac-1 deficient mice. Wound Repair Regen 2017; 25:366-376. [PMID: 28370678 DOI: 10.1111/wrr.12531] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 02/16/2017] [Accepted: 03/15/2017] [Indexed: 11/27/2022]
Abstract
Mac-1 (CD11b/CD18) is a macrophage receptor that plays several critical roles in macrophage recruitment and activation. Because macrophages are essential for proper wound healing, the impact of Mac-1 deficiency on wound healing is of significant interest. Prior studies have shown that Mac-1-/- mice exhibit deficits in healing, including delayed wound closure in scalp and ear wounds. This study examined whether Mac-1 deficiency influences wound healing in small excisional and incisional skin wounds. Three millimeter diameter full thickness excisional wounds and incisional wounds were prepared on the dorsal skin of Mac-1 deficient (Mac-1-/- ) and wild type (WT) mice, and wound healing outcomes were examined. Mac-1 deficient mice exhibited a normal rate of wound closure, generally normal levels of total collagen, and nearly normal synthesis and distribution of collagens I and III. In incisional wounds, wound breaking strength was similar for Mac-1-/- and WT mice. Wounds of Mac-1 deficient mice displayed normal total macrophage content, although macrophage phenotype markers were skewed as compared to WT. Interestingly, amounts of TGF-β1 and its downstream signaling molecules, SMAD2 and SMAD3, were significantly decreased in the wounds of Mac-1 deficient mice compared to WT. The results suggest that Mac-1 deficiency has little impact on the healing of small excisional and incisional wounds. Moreover, the findings demonstrate that the effect of single genetic deficiencies on wound healing may markedly differ among wound models. These conclusions have implications for the interpretation of the many prior studies that utilize a single model system to examine wound healing outcomes in genetically deficient mice.
Collapse
Affiliation(s)
- Lin Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Sridevi Nagaraja
- Department of Defense Biotechnology High Performance Computing Software Applications Institute, Telemedicine and Advanced Technology Research Center, U.S. Army Medical Research and Materiel Command, Ft. Detrick, Maryland
| | - Jian Zhou
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Yan Zhao
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - David Fine
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Alexander Y Mitrophanov
- Department of Defense Biotechnology High Performance Computing Software Applications Institute, Telemedicine and Advanced Technology Research Center, U.S. Army Medical Research and Materiel Command, Ft. Detrick, Maryland
| | - Jaques Reifman
- Department of Defense Biotechnology High Performance Computing Software Applications Institute, Telemedicine and Advanced Technology Research Center, U.S. Army Medical Research and Materiel Command, Ft. Detrick, Maryland
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| |
Collapse
|
27
|
Nagaraja S, Chen L, Zhou J, Zhao Y, Fine D, DiPietro LA, Reifman J, Mitrophanov AY. Predictive Analysis of Mechanistic Triggers and Mitigation Strategies for Pathological Scarring in Skin Wounds. J I 2016; 198:832-841. [DOI: 10.4049/jimmunol.1601273] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 11/15/2016] [Indexed: 12/17/2022]
|
28
|
Abstract
Clinical observation suggests that oral mucosal wounds heal faster than skin; however, little is known about the site-specific differences. Since fetal skin wounds heal rapidly, but are less vascular than adult wounds, we hypothesized that less robust wound angiogenesis might be observed in healing oral mucosa. This study investigated angiogenesis in equivalent-size oral and skin murine wounds. Change in wound bed vascularity was significantly lower in oral wounds than in skin. Also, vascular endothelial growth factor (VEGF) levels were less in oral than cutaneous wounds. Because keratinocytes are a prominent source of VEGF in wounds, we compared VEGF production by oral and epidermal keratinocytes in vitro. Significantly higher levels of VEGF protein and mRNA were observed in epidermal keratinocytes than in oral keratinocytes after 18 hrs of hypoxia. This study demonstrates distinct angiogenesis patterns in oral and skin wounds and intrinsic site-specific differences in VEGF production by keratinocytes.
Collapse
Affiliation(s)
- A M Szpaderska
- Burn and Shock Trauma Institute, Loyola University Medical Center, Maywood, IL 60153, USA
| | | | | | | |
Collapse
|
29
|
Abstract
All animals heal, and the ability to heal is requisite for human health. One aspect of repair that has always been considered to be essential for adequate healing is the creation of a new vasculature via angiogenesis. As adult skin wounds heal, a period of rapid and robust capillary growth creates a vascular bed that has many fold more capillaries than does normal tissue. Over time, most of the newly formed capillaries regress, resulting in a final vascular density similar to that of normal skin. Certainly, new capillaries are necessary to bring nutrients, immune cells, and oxygen to healing wounds. Yet, the presumed functional importance of an overabundance of capillaries has recently been challenged, creating questions about whether excess capillary growth is truly necessary for healing. In particular, studies of wounds that heal exceptionally quickly and with less scar formation, such as those in fetal skin and oral mucosa, show that these tissues heal with a reduced angiogenic burst composed of more mature vessels that provide better oxygenation. The level of angiogenesis in wounds often correlates with the inflammatory response, largely because inflammatory cells produce an abundance of proangiogenic mediators. Both the selective reduction of inflammation and the selective reduction of angiogenesis have now been suggested as ways to improve scarring. These concepts link excessive inflammation and the production of a dense but poorly perfused capillary bed to inferior healing outcomes.
Collapse
Affiliation(s)
- Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, Illinois
| |
Collapse
|
30
|
Urao N, Okonkwo UA, Fang MM, Zhuang ZW, Koh TJ, DiPietro LA. MicroCT angiography detects vascular formation and regression in skin wound healing. Microvasc Res 2016; 106:57-66. [PMID: 27009591 DOI: 10.1016/j.mvr.2016.03.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 03/09/2016] [Accepted: 03/17/2016] [Indexed: 12/27/2022]
Abstract
Properly regulated angiogenesis and arteriogenesis are essential for effective wound healing. Tissue injury induces robust new vessel formation and subsequent vessel maturation, which involves vessel regression and remodeling. Although formation of functional vasculature is essential for healing, alterations in vascular structure over the time course of skin wound healing are not well understood. Here, using high-resolution ex vivo X-ray micro-computed tomography (microCT), we describe the vascular network during healing of skin excisional wounds with highly detailed three-dimensional (3D) reconstructed images and associated quantitative analysis. We found that relative vessel volume, surface area and branching number are significantly decreased in wounds from day 7 to days 14 and 21. Segmentation and skeletonization analysis of selected branches from high-resolution images as small as 2.5μm voxel size show that branching orders are decreased in the wound vessels during healing. In histological analysis, we found that the contrast agent fills mainly arterioles, but not small capillaries nor large veins. In summary, high-resolution microCT revealed dynamic alterations of vessel structures during wound healing. This technique may be useful as a key tool in the study of the formation and regression of wound vessels.
Collapse
Affiliation(s)
- Norifumi Urao
- University of Illinois at Chicago, Center for Wound Healing and Tissue Regeneration, Department of Kinesiology and Nutrition, USA.
| | - Uzoagu A Okonkwo
- University of Illinois at Chicago College of Dentistry, Center for Wound Healing and Tissue Regeneration, Department of Periodontics, USA
| | - Milie M Fang
- University of Illinois at Chicago, Center for Wound Healing and Tissue Regeneration, Department of Kinesiology and Nutrition, USA
| | - Zhen W Zhuang
- Yale School of Medicine, Yale University, Yale Translational Research Imaging Center, USA
| | - Timothy J Koh
- University of Illinois at Chicago, Center for Wound Healing and Tissue Regeneration, Department of Kinesiology and Nutrition, USA
| | - Luisa A DiPietro
- University of Illinois at Chicago College of Dentistry, Center for Wound Healing and Tissue Regeneration, Department of Periodontics, USA.
| |
Collapse
|
31
|
Schmidt J, Lee MK, Ko E, Jeong JH, DiPietro LA, Kong H. Alginate Sulfates Mitigate Binding Kinetics of Proangiogenic Growth Factors with Receptors toward Revascularization. Mol Pharm 2016; 13:2148-54. [PMID: 26881299 DOI: 10.1021/acs.molpharmaceut.5b00905] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ever since proangiogenic growth factors have been used as a vascular medicine to treat tissue ischemia, efforts have been increasingly made to develop a method to enhance efficacy of growth factors in recreating microvascular networks, especially at low dose. To this end, we hypothesized that polysaccharides substituted with sulfate groups would amplify growth factor receptor activation and stimulate phenotypic activities of endothelial cells involved in neovascularization. We examined this hypothesis by modifying alginate with a controlled number of sulfates and using it to derive a complex with vascular endothelial growth factor (VEGF), as confirmed with fluorescence resonance energy transfer (FRET) assay. Compared with the bare VEGF and with a mixture of VEGF and unmodified alginates, the VEGF complexed with alginate sulfates significantly reduced the dissociation rate with the VEGFR-2, elevated VEGFR-2 phosphorylation level, and increased the number of endothelial sprouts in vitro. Furthermore, the VEGF-alginate sulfate complex improved recovery of perfusion in an ischemic hindlimb of a mouse due to the increase of the capillary density. Overall, this study not only demonstrates an important cofactor of VEGF but also uncovers an underlying mechanism by which the cofactor mitigates the VEGF-induced signaling involved in the binding kinetics and activation of VEGFR. We therefore believe that the results of this study will be highly useful in improving the therapeutic efficacy of various growth factors and expediting their uses in clinical treatments of wounds and tissue defects.
Collapse
Affiliation(s)
- John Schmidt
- Department of Chemical and Biomolecular Engineering, Carl R. Woese Institute of Genomic Biology, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Min Kyung Lee
- Department of Chemical and Biomolecular Engineering, Carl R. Woese Institute of Genomic Biology, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Eunkyung Ko
- Department of Bioengineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Jae Hyun Jeong
- Department of Chemical Engineering, Soongsil University , Seoul, Korea
| | - Luisa A DiPietro
- College of Dentistry University of Illinois at Chicago , Chicago, Illinois 60607, United States
| | - Hyunjoon Kong
- Department of Chemical and Biomolecular Engineering, Carl R. Woese Institute of Genomic Biology, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.,Department of Bioengineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.,Department of Chemical Engineering, Soongsil University , Seoul, Korea
| |
Collapse
|
32
|
Zhao Y, Bao L, Chan LS, DiPietro LA, Chen L. Correction: Aberrant Wound Healing in an Epidermal Interleukin-4 Transgenic Mouse Model of Atopic Dermatitis. PLoS One 2016; 11:e0150443. [PMID: 26910413 PMCID: PMC4766011 DOI: 10.1371/journal.pone.0150443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
|
33
|
Zhao Y, Bao L, Chan LS, DiPietro LA, Chen L. Aberrant Wound Healing in an Epidermal Interleukin-4 Transgenic Mouse Model of Atopic Dermatitis. PLoS One 2016; 11:e0146451. [PMID: 26752054 PMCID: PMC4709197 DOI: 10.1371/journal.pone.0146451] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Accepted: 12/17/2015] [Indexed: 01/13/2023] Open
Abstract
Wound healing in a pre-existing Th2-dominated skin milieu was assessed by using an epidermal specific interleukin-4 (IL-4) transgenic (Tg) mouse model, which develops a pruritic inflammatory skin condition resembling human atopic dermatitis. Our results demonstrated that IL-4 Tg mice had delayed wound closure and re-epithelialization even though these mice exhibited higher degrees of epithelial cell proliferation. Wounds in IL-4 Tg mice also showed a marked enhancement in expression of inflammatory cytokines/chemokines, elevated infiltration of inflammatory cells including neutrophils, macrophages, CD3+ lymphocytes, and epidermal dendritic T lymphocytes. In addition, these mice exhibited a significantly higher level of angiogenesis as compared to wild type mice. Furthermore, wounds in IL-4 Tg mice presented with larger amounts of granulation tissue, but had less expression and deposition of collagen. Taken together, an inflamed skin condition induced by IL-4 has a pronounced negative influence on the healing process. Understanding more about the pathogenesis of wound healing in a Th2- dominated environment may help investigators explore new potential therapeutic strategies.
Collapse
Affiliation(s)
- Yan Zhao
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Lei Bao
- Departments of Dermatology, College of Medicine, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Lawrence S. Chan
- Departments of Dermatology, College of Medicine, University of Illinois at Chicago, Chicago, Illinois, United States of America
- Departments of Immunology and Microbiology, College of Medicine, University of Illinois at Chicago, Chicago, Illinois, United States of America
- Medicine Service, Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois, United States of America
| | - Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois, United States of America
- * E-mail:
| |
Collapse
|
34
|
Chen L, Mirza R, Kwon Y, DiPietro LA, Koh TJ. The murine excisional wound model: Contraction revisited. Wound Repair Regen 2015; 23:874-7. [PMID: 26136050 DOI: 10.1111/wrr.12338] [Citation(s) in RCA: 109] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 06/23/2015] [Indexed: 01/09/2023]
Abstract
Rodent models of healing are considered limited because of the perception that rodent wounds heal by contraction while humans heal by reepithelialization The purpose of this report is to present evidence that simple murine excisional wounds provide a valid and reproducible wound model that heals by both contraction and reepithelialization. Previous studies have shown that, although rodent wounds contract by up to 80%, much of this contraction occurs only after epithelial closure. To confirm these previous findings, we measured re-epithelialization and contraction in three separate mouse strains, (BALB/c, db/+, and db/db); reepithelialization and contraction each accounted for ∼40 to 60% of the initial closure of full thickness excisional wounds. After closure, the wound continues to contract and this provides the impression of dominant closure by contraction. In conclusion, the simple excisional rodent wound model produces a well defined and readily identifiable wound bed over which the process of reepithelialization is clearly measurable.
Collapse
Affiliation(s)
- Lin Chen
- Department of Periodontics, University of Illinois at Chicago, Chicago, Illinois.,Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, Illinois
| | - Rita Mirza
- Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, Illinois
| | - Young Kwon
- Department of Periodontics, University of Illinois at Chicago, Chicago, Illinois.,Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, Illinois
| | - Luisa A DiPietro
- Department of Periodontics, University of Illinois at Chicago, Chicago, Illinois.,Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, Illinois
| | - Timothy J Koh
- Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, Illinois
| |
Collapse
|
35
|
Goldufsky J, Wood SJ, Jayaraman V, Majdobeh O, Chen L, Qin S, Zhang C, DiPietro LA, Shafikhani SH. Pseudomonas aeruginosa uses T3SS to inhibit diabetic wound healing. Wound Repair Regen 2015; 23:557-64. [PMID: 25912785 DOI: 10.1111/wrr.12310] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 04/22/2015] [Indexed: 12/16/2022]
Abstract
Diabetic foot ulcers are responsible for more hospitalizations than any other complication of diabetes. Bacterial infection is recognized as an important factor associated with impaired healing in diabetic ulcers. Pseudomonas aeruginosa is the most frequently detected Gram-negative pathogen in diabetic ulcers. P. aeruginosa infection has been shown to impair healing in diabetic wounds in a manner that correlates with its ability to form biofilm. While the majority of infections in diabetic ulcers are biofilm associated, 33% of infections are nonbiofilm in nature. P. aeruginosa is the most prevalent Gram-negative pathogen in all diabetic wound types, which suggests that the deleterious impact of P. aeruginosa on healing in diabetic wounds goes beyond its ability to form biofilm and likely involves other factors. The Type III Secretion System (T3SS) virulence structure is required for the pathogenesis of all P. aeruginosa clinical isolates, suggesting that it may also play a role in the inhibition of wound repair in diabetic skin ulcers. We evaluated the role of T3SS in mediating P. aeruginosa-induced tissue damage in the wounds of diabetic mice. Our data demonstrate that P. aeruginosa establishes a robust and persistent infection in diabetic wounds independent of its ability to form biofilm and causes severe wound damage in a manner that primarily depends on its T3SS.
Collapse
Affiliation(s)
- Josef Goldufsky
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois
| | - Stephen J Wood
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois
| | - Vijayakumar Jayaraman
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois
| | - Omar Majdobeh
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Shanshan Qin
- Department of Pharmacology, Rush University Medical Center, Chicago, Illinois
| | - Chunxiang Zhang
- Department of Pharmacology, Rush University Medical Center, Chicago, Illinois
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Sasha H Shafikhani
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois.,Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois.,Cancer Center, Rush University Medical Center Chicago, Illinois
| |
Collapse
|
36
|
Wietecha MS, Król MJ, Michalczyk ER, Chen L, Gettins PG, DiPietro LA. Pigment epithelium-derived factor as a multifunctional regulator of wound healing. Am J Physiol Heart Circ Physiol 2015; 309:H812-26. [PMID: 26163443 DOI: 10.1152/ajpheart.00153.2015] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 07/08/2015] [Indexed: 01/12/2023]
Abstract
During dermal wound repair, hypoxia-driven proliferation results in dense but highly permeable, disorganized microvascular networks, similar to those in solid tumors. Concurrently, activated dermal fibroblasts generate an angiopermissive, provisional extracellular matrix (ECM). Unlike cancers, wounds naturally resolve via blood vessel regression and ECM maturation, which are essential for reestablishing tissue homeostasis. Mechanisms guiding wound resolution are poorly understood; one candidate regulator is pigment epithelium-derived factor (PEDF), a secreted glycoprotein. PEDF is a potent antiangiogenic in models of pathological angiogenesis and a promising cancer and cardiovascular disease therapeutic, but little is known about its physiological function. To examine the roles of PEDF in physiological wound repair, we used a reproducible model of excisional skin wound healing in BALB/c mice. We show that PEDF is abundant in unwounded and healing skin, is produced primarily by dermal fibroblasts, binds to resident microvascular endothelial cells, and accumulates in dermal ECM and epidermis. PEDF transcript and protein levels were low during the inflammatory and proliferative phases of healing but increased in quantity and colocalization with microvasculature during wound resolution. Local antibody inhibition of endogenous PEDF delayed vessel regression and collagen maturation during the remodeling phase. Treatment of wounds with intradermal injections of exogenous, recombinant PEDF inhibited nascent angiogenesis by repressing endothelial proliferation, promoted vascular integrity and function, and increased collagen maturity. These results demonstrate that PEDF contributes to the resolution of healing wounds by causing regression of immature blood vessels and stimulating maturation of the vascular microenvironment, thus promoting a return to tissue homeostasis after injury.
Collapse
Affiliation(s)
- Mateusz S Wietecha
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois; and
| | - Mateusz J Król
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois; and
| | - Elizabeth R Michalczyk
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois; and
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois; and
| | - Peter G Gettins
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, Illinois
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois; and
| |
Collapse
|
37
|
Abstract
Pigment epithelium-derived factor (PEDF) is a multifunctional factor with potent anti-angiogenic activity that may play a role in skin homoeostasis and wound healing. Analysis of PEDF levels demonstrated that PEDF levels are high in normal skin but quite low in early wounds. As previous studies have suggested that keratinocytes can produce PEDF, we investigated how conditions that mimic those found at sites of injury influence PEDF production by keratinocytes in vitro. Both injury by mechanical disruption (scratch assay) and treatment of human keratinocytes with inflammatory cytokines (IL-1β, IL-6 and TNF-α) inhibited PEDF expression. We next examined how PEDF affects keratinocyte functions that are important in tissue repair. Treatment of keratinocytes with exogenous PEDF enhanced keratinocyte adhesion, therefore impairing migration, while having no effect on cell proliferation. The results suggest that modulation of PEDF levels may play a pivotal role in skin homoeostasis and the response of keratinocytes to injury or inflammatory insults.
Collapse
Affiliation(s)
- Lin Chen
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL, USA
| | | |
Collapse
|
38
|
Chen L, Mehta ND, Zhao Y, DiPietro LA. Absence of CD4 or CD8 lymphocytes changes infiltration of inflammatory cells and profiles of cytokine expression in skin wounds, but does not impair healing. Exp Dermatol 2014; 23:189-94. [PMID: 24521099 DOI: 10.1111/exd.12346] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/06/2014] [Indexed: 12/13/2022]
Abstract
The involvement of lymphocytes in skin wound healing has not been studied extensively. This study shows that CD4 and CD8 cells are present in significant numbers in skin wounds with peak levels at days 5-10 and 7-10, respectively. Both subsets expressed inflammatory and/or regulatory cytokines. To examine the function of CD4 and CD8 lymphocytes in tissue repair, wound healing was examined in mice deficient for either CD4 or CD8 cells. Wounds in CD4 deficient mice exhibited an initial delayed infiltration of CD8 cells followed by a relative increase in CD8 cells at day 10 and thereafter. Wounds in CD4 deficient mice also displayed up-regulated expression of IL1β, IL-6, IL-17, IFN-γ, CXCL-1 and down-regulated expression of IL-4 as compared to wild-type mice. In contrast, wounds in CD8 deficient mice showed significantly decreased infiltration of CD4+ cells, neutrophils, and macrophages along with down-regulated expression of IL1β, IL-6, TNF-α, CXCL-1, CCL-2 and up-regulated expression of IL-4 as compared to wild-type mice. Despite these significant changes in cytokine expression and inflammatory cell infiltrate, the rate of wound closure, wound breaking strength, collagen content and angiogenesis in either CD4 or CD8 deficiency showed no significant difference from that of wild-type mice. The results suggest that, despite being present and involved in wound inflammation, neither CD4+ nor CD8+ cells play critical roles in the healing process of skin wounds. Further studies are needed to investigate whether these cells might play critical roles in wounds that experience stress such as ischemia or infection.
Collapse
Affiliation(s)
- Lin Chen
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL, USA
| | | | | | | |
Collapse
|
39
|
DiPietro LA. Oral Stem Cells: The Fountain of Youth for Epithelialization and Wound Therapy? Adv Wound Care (New Rochelle) 2014; 3:465-467. [PMID: 25032065 DOI: 10.1089/wound.2012.0421] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Indexed: 12/18/2022] Open
Abstract
Significance: The oral cavity represents a novel source of a large number of stem cells. Recent Advances: Stem cell populations have been identified in dental pulp, gingival epithelium, gingival lamina propria, and the periodontal ligament. Critical Issues: The utility of using tissues of the oral cavity as a source of stem cells has been only partially explored. Much remains to be learned about the capability of these cells and the differences between cells derived from dissimilar oral locations. Future Directions: The feasibility of using orally derived stem cells to support tissue regeneration and wound repair is a promising concept that requires additional investigation.
Collapse
Affiliation(s)
- Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, Illinois
| |
Collapse
|
40
|
Wood S, Jayaraman V, Huelsmann EJ, Bonish B, Burgad D, Sivaramakrishnan G, Qin S, DiPietro LA, Zloza A, Zhang C, Shafikhani SH. Pro-inflammatory chemokine CCL2 (MCP-1) promotes healing in diabetic wounds by restoring the macrophage response. PLoS One 2014; 9:e91574. [PMID: 24618995 PMCID: PMC3950222 DOI: 10.1371/journal.pone.0091574] [Citation(s) in RCA: 173] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2013] [Accepted: 02/13/2014] [Indexed: 01/13/2023] Open
Abstract
Prior studies suggest that the impaired healing seen in diabetic wounds derives from a state of persistent hyper-inflammation characterized by harmful increases in inflammatory leukocytes including macrophages. However, such studies have focused on wounds at later time points (day 10 or older), and very little attention has been given to the dynamics of macrophage responses in diabetic wounds early after injury. Given the importance of macrophages for the process of healing, we studied the dynamics of macrophage response during early and late phases of healing in diabetic wounds. Here, we report that early after injury, the diabetic wound exhibits a significant delay in macrophage infiltration. The delay in the macrophage response in diabetic wounds results from reduced Chemokine (C-C motif) ligand 2 (CCL2) expression. Importantly, one-time treatment with chemoattractant CCL2 significantly stimulated healing in diabetic wounds by restoring the macrophage response. Our data demonstrate that, rather than a hyper-inflammatory state; the early diabetic wound exhibits a paradoxical and damaging decrease in essential macrophage response. Our studies suggest that the restoration of the proper kinetics of macrophage response may be able to jumpstart subsequent healing stages. CCL2 chemokine-based therapy may be an attractive strategy to promote healing in diabetic wounds.
Collapse
Affiliation(s)
- Stephen Wood
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Vijayakumar Jayaraman
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Erica J. Huelsmann
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
- Rush University Cancer Center, Rush University Medical Center, Chicago, Illinois, United States of America
- Developmental Center for AIDS Research, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Brian Bonish
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Dermatology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Derick Burgad
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Gayathri Sivaramakrishnan
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Shanshan Qin
- Department of Pharmacology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Andrew Zloza
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
- Rush University Cancer Center, Rush University Medical Center, Chicago, Illinois, United States of America
- Developmental Center for AIDS Research, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Chunxiang Zhang
- Department of Pharmacology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Sasha H. Shafikhani
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
- Rush University Cancer Center, Rush University Medical Center, Chicago, Illinois, United States of America
- * E-mail:
| |
Collapse
|
41
|
|
42
|
Chen L, Schrementi ME, Ranzer MJ, Wilgus TA, DiPietro LA. Blockade of mast cell activation reduces cutaneous scar formation. PLoS One 2014; 9:e85226. [PMID: 24465509 PMCID: PMC3898956 DOI: 10.1371/journal.pone.0085226] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 12/03/2013] [Indexed: 11/18/2022] Open
Abstract
Damage to the skin initiates a cascade of well-orchestrated events that ultimately leads to repair of the wound. The inflammatory response is key to wound healing both through preventing infection and stimulating proliferation and remodeling of the skin. Mast cells within the tissue are one of the first immune cells to respond to trauma, and upon activation they release pro-inflammatory molecules to initiate recruitment of leukocytes and promote a vascular response in the tissue. Additionally, mast cells stimulate collagen synthesis by dermal fibroblasts, suggesting they may also influence scar formation. To examine the contribution of mast cells in tissue repair, we determined the effects the mast cell inhibitor, disodium cromoglycate (DSCG), on several parameters of dermal repair including, inflammation, re-epithelialization, collagen fiber organization, collagen ultrastructure, scar width and wound breaking strength. Mice treated with DSCG had significantly reduced levels of the inflammatory cytokines IL-1α, IL-1β, and CXCL1. Although DSCG treatment reduced the production of inflammatory mediators, the rate of re-epithelialization was not affected. Compared to control, inhibition of mast cell activity caused a significant decrease in scar width along with accelerated collagen re-organization. Despite the reduced scar width, DSCG treatment did not affect the breaking strength of the healed tissue. Tryptase β1 exclusively produced by mast cells was found to increase significantly in the course of wound healing. However, DSCG treatment did not change its level in the wounds. These results indicate that blockade of mast cell activation reduces scar formation and inflammation without further weakening the healed wound.
Collapse
Affiliation(s)
- Lin Chen
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Megan E. Schrementi
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Matthew J. Ranzer
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Traci A. Wilgus
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, Illinois, United States of America
- * E-mail:
| |
Collapse
|
43
|
Halpern LR, Kaste LM, Briggs C, DiPietro LA, Erwin K, Frantsve-Hawley J, Gordon S, Heaton B, Henshaw MM, Joskow R, Reisine ST, Sinkford JC. Women's oral health: growing evidence for enhancing perspectives. Dent Clin North Am 2013; 57:xv-xxviii. [PMID: 23570812 DOI: 10.1016/j.cden.2013.02.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Women's health, including oral health, is an evolving science with foundation knowledge from many disciplines. Key milestones, particularly in the last decade, provide a roadmap towards the necessary inclusion of gender into dental practice. Such focus is especially important for the evolving role of oral health care providers as primary health care providers. Continued progress of the vibrant incorporation of evidence-based women's oral health into the standard practice of oral health care is encouraged. This expanded preface provides an introduction to this DCNA issue, a brief history and timeline of major women's oral health events, and resources for further consideration.
Collapse
Affiliation(s)
- Leslie R Halpern
- Oral and Maxillofacial Surgery, Meharry Medical College, School of Dentistry, Nashville, TN 37208, USA.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Antony AK, Rodby K, Tobin MK, O'Connor MI, Pearl RK, DiPietro LA, Breidenbach WC, Bartholomew AM. Composite tissue allotransplantation and dysregulation in tissue repair and regeneration: a role for mesenchymal stem cells. Front Immunol 2013; 4:188. [PMID: 23847625 PMCID: PMC3705198 DOI: 10.3389/fimmu.2013.00188] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2013] [Accepted: 06/25/2013] [Indexed: 01/09/2023] Open
Abstract
Vascularized composite tissue allotransplantation is a rapidly evolving area that has brought technological advances to the forefront of plastic surgery, hand surgery, and transplant biology. Composite tissue allografts (CTAs) may have profound functional, esthetic, and psychological benefits, but carry with them the risks of life-long immunosuppression and the inadequate abilities to monitor and prevent rejection. Allografts may suffer from additional insults further weakening their overall benefits. Changes in local blood flow, lack of fully restored neurologic function, infection, inflammation with subsequent dysregulated regenerative activity, and paucity of appropriate growth factors may all be involved in reducing the potential of CTAs and therefore serve as new therapeutic targets to improve outcomes. Strategies involving minimized immunosuppression and pro-regenerative therapy may provide a greater path to optimizing long-term CTA function. One such strategy may include mesenchymal stem cells (MSCs), which can provide unique anti-inflammatory and pro-regenerative effects. Insights gained from new studies with MSCs on composite allografts, advances in tissue regeneration reported in other MSC-based clinical studies, as well as consideration of newly described capacities of MSCs, may provide new regenerative based strategies for the care of CTAs.
Collapse
Affiliation(s)
- Anuja K Antony
- Department of Surgery, Division of Plastic, Reconstructive and Cosmetic Surgery, University of Illinois at Chicago , Chicago, IL , USA
| | | | | | | | | | | | | | | |
Collapse
|
45
|
Lee S, Szilagyi E, Chen L, Premanand K, DiPietro LA, Ennis W, Bartholomew AM. Activated mesenchymal stem cells increase wound tensile strength in aged mouse model via macrophages. J Surg Res 2013; 181:20-4. [DOI: 10.1016/j.jss.2012.05.040] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Revised: 05/02/2012] [Accepted: 05/10/2012] [Indexed: 01/09/2023]
|
46
|
Abstract
SIGNIFICANCE Re-establishment of a functional vascular network is a critical component of successful wound repair. One of the most potent pro-angiogenic agents is vascular endothelial growth factor (VEGF), which, from a basic science and pre-clinical perspective, seems ideal for the therapeutic stimulation of blood vessel growth in non-healing wounds. CRITICAL ISSUES Current strategies to improve the dysfunctional angiogenesis that occurs in non-healing wounds are inadequate with regard to the nature and magnitude of the clinical problem. However, VEGF therapy has so far been unsuccessful in promoting healing in the clinic. More effective means of delivery to the wound, which take into account the biochemical and spatio-temporal aspects of angiogenesis, may be necessary to realize VEGF's therapeutic potential. Reviewed approaches for the regulation of wound angiogenesis include: targeting regulators of intracellular VEGF signaling, making use of collagen-binding VEGF fusion proteins for increased retention in the wound, and implantation of heterogeneous scaffold systems for spatial control of angiogenesis with simultaneous use of VEGF and its inhibitor. FUTURE DIRECTIONS To maximize efficacy of therapeutic VEGF, it may be necessary to also target its intracellular inhibitory mechanisms. Immobilizing VEGF to the wound matrix may increase its bioavailability and therapeutic efficacy. Gaining spatial control of angiogenesis opens up possibilities for advanced directed therapy. The reviewed studies present innovative approaches to in vivo directed modulation of angiogenesis utilizing VEGF biology which can, if taken further and validated in human subjects, have significant impact on clinical wound care in the future.
Collapse
Affiliation(s)
- Mateusz S. Wietecha
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| |
Collapse
|
47
|
Lo JF, Brennan M, Merchant Z, Chen L, Guo S, Eddington DT, DiPietro LA. Microfluidic wound bandage: localized oxygen modulation of collagen maturation. Wound Repair Regen 2013; 21:226-34. [PMID: 23438079 DOI: 10.1111/wrr.12021] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Accepted: 11/29/2012] [Indexed: 11/30/2022]
Abstract
Restoring tissue oxygenation has the potential to improve poorly healing wounds with impaired microvasculature. Compared with more established wound therapy using hyperbaric oxygen chambers, topical oxygen therapy has lower cost and better patient comfort, although topical devices have provided inconsistent results. To provide controlled topical oxygen while minimizing moisture loss, a major issue for topical oxygen, we have devised a novel wound bandage based on microfluidic diffusion delivery of oxygen. In addition to modulating oxygen from 0 to 100% in 60 seconds rise time, the microfluidic oxygen bandage provides a conformal seal around the wound. When 100% oxygen is delivered, it penetrates wound tissues as measured in agar phantom and in vivo wounds. Using this microfluidic bandage, we applied the oxygen modulation to 8 mm excisional wounds prepared on diabetic mice. Treatment with the microfluidic bandage demonstrated improved collagen maturity in the wound bed, although only marginal differences were observed in total collagen, microvasculature, and external closure rates. Our results show that proper topical oxygen can improve wound parameters underneath the surface. Because of the ease of fabrication, the oxygen bandage represents an economical yet practical method for oxygen wound research.
Collapse
Affiliation(s)
- Joe F Lo
- Department of Mechanical Engineering, College of Engineering and Computer Sciences, University of Michigan at Dearborn, Dearborn, MI, USA.
| | | | | | | | | | | | | |
Collapse
|
48
|
Abstract
Toll-like receptor 4 (TLR4) has a key role in the initiation of innate immunity and in the regulation of adaptive immune responses. Using microarray analysis and PCR, TLR4 expression was observed to increase in murine skin wounds at the early stages. The cellular location of TLR4 was primarily in keratinocytes at the wound edges. The closure of excisional wounds was significantly delayed in TLR4-deficient (C3H/HeJ) as compared with wild-type mice, and both IL-1β and IL-6 production were significantly lower in the wounds of TLR4-deficient mice. EGF also markedly decreased in the wound edge of epidermis in TLR4-deficient mice. In vitro studies confirmed that a wound stimulus induces TLR4 mRNA expression in primary normal human epidermal keratinocytes (NHEK). In vitro injury also induced the phosphorylation of p38 and JNK MAPK (Jun N-terminal kinase mitogen-activated protein kinase) and the expression of IL-1β and tumor necrosis factor-α by NHEK. Blockade of TLR4 delayed NHEK migration and abolished the phosphorylation of p38 and JNK MAPK, and blockade of TLR4 and/or p38/JNK abolished IL-1β production. The results suggest that inflammatory cytokine production by injured NHEK is stimulated via the TLR4-p38 and JNK MAPK signaling pathway. Together, the results provide evidence for a role of TLR4 at sites of injury, and suggest that TLR4 is an important regulator of wound inflammation.
Collapse
Affiliation(s)
- Lin Chen
- College of Dentistry, University of Illinois, Chicago, IL, USA
| | | | | | | |
Collapse
|
49
|
Abstract
Despite accelerated epithelial closure, oral mucosal wounds exhibit lower levels of VEGF and a more refined angiogenic response than do skin wounds. The specific differences in angiogenesis suggest that skin and oral mucosal wounds may experience dissimilar levels of hypoxia and HIF-1α. Using a model of comparable wounds on murine dorsal skin and tongue, we determined levels of hypoxia and HIF-1α. Skin wounds were found to be significantly more hypoxic and had higher levels of HIF-1α than mucosal wounds. Furthermore, under stressed conditions, skin wounds, but not mucosal wounds, exhibited a further elevation of HIF-1α beyond that of non-stressed levels. To determine if manipulation of oxygen levels might equalize the repair response of each tissue, we exposed mice to hyperbaric oxygen treatment (HBOT) following wounding. HBOT did not significantly change HIF-1α or VEGF expression in either skin or mucosal wounds, nor did it alter wound bed vascularity. These studies suggest that skin wounds have higher levels of hypoxia than do mucosal wounds, along with a differential expression of HIF-1α. Interestingly, modulation of oxygen by HBOT does not ameliorate this difference. These results suggest that differential responses to hypoxia may underlie the distinctive wound-healing phenotypes seen in skin and oral mucosa.
Collapse
Affiliation(s)
- L Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, 801 S. Paulina St., MC 859, Chicago, IL 60612, USA
| | | | | |
Collapse
|
50
|
|