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Urabe H, Akimoto R, Kamiya S, Hosoki K, Ichikawa H, Nishiyama T. Effects of pulsed electrical stimulation on α-smooth muscle actin and type I collagen expression in human dermal fibroblasts. Biosci Biotechnol Biochem 2024; 88:522-528. [PMID: 38341279 DOI: 10.1093/bbb/zbae017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Accepted: 02/06/2024] [Indexed: 02/12/2024]
Abstract
Pulsed electrical stimulation (PES) is known to affect cellular activities. We previously found PES to human dermal fibroblasts (HFs) promoted platelet-derived growth factor subunit A (PDGFA) gene expression, which enhanced proliferation. In this study, we investigated PES effects on fibroblast collagen production and differentiation into myofibroblasts. HFs were electrically stimulated at 4800 Hz and 5 V for 60 min. Imatinib, a specific inhibitor of PDGF receptors, was treated before PES. After 6 h of PES, PDGFA, α-smooth muscle actin (α-SMA), and collagen type I α1 chain gene expressions were upregulated in PES group. Imatinib suppressed the promoted expression except for PDGFA. Immunofluorescence staining and enzyme-linked immunosorbent assay showed the production of α-SMA and collagen I was enhanced in PES group but suppressed in PES + imatinib group at 48 h after PES. Therefore, PES promotes the production of α-SMA and collagen I in fibroblasts, which is triggered by PDGFA that is upregulated early after PES.
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Affiliation(s)
| | | | | | | | | | - Toshio Nishiyama
- Homer Ion Laboratory Co., Ltd., Tokyo, Japan
- Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan
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2
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Urabe H, Akimoto R, Kamiya S, Hosoki K, Ichikawa H, Nishiyama T. Pulsed electrical stimulation and amino acid derivatives promote collagen gene expression in human dermal fibroblasts. Cytotechnology 2024; 76:139-151. [PMID: 38304625 PMCID: PMC10828296 DOI: 10.1007/s10616-023-00604-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 10/19/2023] [Indexed: 02/03/2024] Open
Abstract
Several collagen types are important for maintaining skin structure and function. Previous reports show that l-hydroxyproline (Hyp), N-acetyl-l-hydroxyproline (AHyp), and l-alanyl-l-glutamine (Aln-Gln) are biological active substances with collagen synthesis-promoting effects. In this study, we combined the promotive effects of pulsed electrical stimulation (PES) with three amino acid derivatives in human dermal fibroblasts. Fibroblasts were exposed to PES with a 4,800 Hz pulse frequency and a voltage at 1 or 5 V for 15 min. The gene expression of type I and III collagen (fibrillar collagen), type IV and VII collagen (basement membrane collagen and anchoring fibril collagen) were measured by RT-PCR 48 h after PES. PES alone promoted the expression of COL1A1 and COL3A1 at 5 V but did not alter that of COL4A1 and COL7A1. Each AAD and the AAD mixture promoted the expression of COL4A1 and COL7A1 but either repressed, or did not alter, that of COL1A1 and COL3A1. Compared to treatment with each AAD, PES at 5 V with Hyp promoted the expression of COL1A1 and COL3A1, enhanced COL3A1 expression with AHyp, and stimulated COL3A1 expression with Aln-Gln, while COL4A1 and COL7A1 expressions were not affected. PES and the AAD mixture significantly promoted COL4A1 expression in a voltage-dependent manner, and COL1A1 and COL3A1 demonstrated a similar but nonsignificant trend, whereas COL7A1 expression was not affected. The combination of PES with each AAD or the AAD mixture may improve skin structure and function by increasing the expression of basement membrane collagen and dermal fibrillar collagen.
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Affiliation(s)
- Hiroya Urabe
- Homer Ion Laboratory Co., Ltd, 17-2 Shinsen-cho, Shibuya-ku, Tokyo, 150-0045 Japan
| | - Ryuji Akimoto
- Homer Ion Laboratory Co., Ltd, 17-2 Shinsen-cho, Shibuya-ku, Tokyo, 150-0045 Japan
| | - Shohei Kamiya
- Homer Ion Laboratory Co., Ltd, 17-2 Shinsen-cho, Shibuya-ku, Tokyo, 150-0045 Japan
| | - Katsu Hosoki
- Homer Ion Laboratory Co., Ltd, 17-2 Shinsen-cho, Shibuya-ku, Tokyo, 150-0045 Japan
| | - Hideyuki Ichikawa
- Homer Ion Laboratory Co., Ltd, 17-2 Shinsen-cho, Shibuya-ku, Tokyo, 150-0045 Japan
| | - Toshio Nishiyama
- Homer Ion Laboratory Co., Ltd, 17-2 Shinsen-cho, Shibuya-ku, Tokyo, 150-0045 Japan
- Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509 Japan
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Rabbani M, Rahman E, Powner MB, Triantis IF. Making Sense of Electrical Stimulation: A Meta-analysis for Wound Healing. Ann Biomed Eng 2024; 52:153-177. [PMID: 37743460 PMCID: PMC10808217 DOI: 10.1007/s10439-023-03371-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Accepted: 09/11/2023] [Indexed: 09/26/2023]
Abstract
Electrical stimulation as a mode of external enhancement factor in wound healing has been explored widely. It has proven to have multidimensional effects in wound healing including antibacterial, galvanotaxis, growth factor secretion, proliferation, transdifferentiation, angiogenesis, etc. Despite such vast exploration, this modality has not yet been established as an accepted method for treatment. This article reviews and analyzes the approaches of using electrical stimulation to modulate wound healing and discusses the incoherence in approaches towards reporting the effect of stimulation on the healing process. The analysis starts by discussing various processes adapted in in vitro, in vivo, and clinical practices. Later it is focused on in vitro approaches directed to various stages of wound healing. Based on the analysis, a protocol is put forward for reporting in vitro works in such a way that the outcomes of the experiment are replicable and scalable in other setups. This work proposes a ground of unification for all the in vitro approaches in a more sensible manner, which can be further explored for translating in vitro approaches to complex tissue stimulation to establish electrical stimulation as a controlled clinical method for modulating wound healing.
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Affiliation(s)
- Mamun Rabbani
- Research Centre for Biomedical Engineering, School of Science and Technology, City University of London, Northampton Square, London, ECIV 0HB, UK
| | - Enayetur Rahman
- Research Centre for Biomedical Engineering, School of Science and Technology, City University of London, Northampton Square, London, ECIV 0HB, UK
| | - Michael B Powner
- Centre for Applied Vision Research, School of Health and Psychological Sciences, City University of London, Northampton Square, London, ECIV 0HB, UK
| | - Iasonas F Triantis
- Research Centre for Biomedical Engineering, School of Science and Technology, City University of London, Northampton Square, London, ECIV 0HB, UK.
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Shaw P, Vanraes P, Kumar N, Bogaerts A. Possible Synergies of Nanomaterial-Assisted Tissue Regeneration in Plasma Medicine: Mechanisms and Safety Concerns. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3397. [PMID: 36234523 PMCID: PMC9565759 DOI: 10.3390/nano12193397] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 09/05/2022] [Accepted: 09/06/2022] [Indexed: 06/16/2023]
Abstract
Cold atmospheric plasma and nanomedicine originally emerged as individual domains, but are increasingly applied in combination with each other. Most research is performed in the context of cancer treatment, with only little focus yet on the possible synergies. Many questions remain on the potential of this promising hybrid technology, particularly regarding regenerative medicine and tissue engineering. In this perspective article, we therefore start from the fundamental mechanisms in the individual technologies, in order to envision possible synergies for wound healing and tissue recovery, as well as research strategies to discover and optimize them. Among these strategies, we demonstrate how cold plasmas and nanomaterials can enhance each other's strengths and overcome each other's limitations. The parallels with cancer research, biotechnology and plasma surface modification further serve as inspiration for the envisioned synergies in tissue regeneration. The discovery and optimization of synergies may also be realized based on a profound understanding of the underlying redox- and field-related biological processes. Finally, we emphasize the toxicity concerns in plasma and nanomedicine, which may be partly remediated by their combination, but also partly amplified. A widespread use of standardized protocols and materials is therefore strongly recommended, to ensure both a fast and safe clinical implementation.
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Affiliation(s)
- Priyanka Shaw
- Research Group PLASMANT, Department of Chemistry, University of Antwerp, 2610 Antwerp, Belgium
| | - Patrick Vanraes
- Research Group PLASMANT, Department of Chemistry, University of Antwerp, 2610 Antwerp, Belgium
| | - Naresh Kumar
- Department of Medical Devices, National Institute of Pharmaceutical Education and Research, Guwahati 781125, Assam, India
| | - Annemie Bogaerts
- Research Group PLASMANT, Department of Chemistry, University of Antwerp, 2610 Antwerp, Belgium
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Denda M, Nakanishi S. Do epidermal keratinocytes have sensory and information processing systems? Exp Dermatol 2021; 31:459-474. [PMID: 34726302 DOI: 10.1111/exd.14494] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 10/26/2021] [Accepted: 10/30/2021] [Indexed: 01/22/2023]
Abstract
It was long considered that the role of epidermal keratinocytes is solely to construct a water-impermeable protective membrane, the stratum corneum, at the uppermost layer of the skin. However, in the last two decades, it has been found that keratinocytes contain multiple sensory systems that detect environmental changes, including mechanical stimuli, sound, visible radiation, electric fields, magnetic fields, temperature and chemical stimuli, and also a variety of receptor molecules associated with olfactory or taste sensation. Moreover, neurotransmitters and their receptors that play crucial roles in the brain are functionally expressed in keratinocytes. Recent studies have demonstrated that excitation of keratinocytes can induce sensory perception in the brain. Here, we review the sensory and information processing capabilities of keratinocytes. We discuss the possibility that epidermal keratinocytes might represent the earliest stage in the development of the brain during the evolution of vertebrates.
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Affiliation(s)
- Mitsuhiro Denda
- Institute for Advanced Study of Mathematical Sciences, Meiji University, Nakano-ku, Tokyo, 164-8525, Japan
| | - Shinobu Nakanishi
- Shiseido Global Innovation Center, Nishi-ku, Yokohama, 220-0011, Japan
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Urabe H, Akimoto R, Kamiya S, Hosoki K, Ichikawa H, Nishiyama T. Effects of pulsed electrical stimulation on growth factor gene expression and proliferation in human dermal fibroblasts. Mol Cell Biochem 2020; 476:361-368. [PMID: 32968926 DOI: 10.1007/s11010-020-03912-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Accepted: 09/15/2020] [Indexed: 01/25/2023]
Abstract
Human dermal fibroblast proliferation plays an important role in skin wound healing, and electrical stimulation (ES) promotes skin wound healing. Although the use of ES for skin wound healing has been investigated, the mechanism underlying the effects of ES on cells is still unclear. This study examined the effects of pulsed electrical stimulation (PES) on human dermal fibroblasts. Normal adult human dermal fibroblasts were exposed to a frequency of 4800 Hz, voltage of 1-5 V, and PES exposure time of 15, 30, and 60 min. Dermal fibroblast proliferation and growth factor gene expression were investigated for 6-48 h post PES. Dermal fibroblast proliferation significantly increased from 24 to 48 h post PES at a voltage of 5 V and PES exposure time of 60 min. Under the same conditions, post PES, platelet-derived growth factor subunit A (PDGFA), fibroblast growth factor 2 (FGF2), and transforming growth factor beta 1 (TGF-β1) expression significantly increased from 6 to 24 h, 12 to 48 h, and 24 to 48 h, respectively. Imatinib, a specific inhibitor of platelet-derived growth factor receptor, significantly inhibited the proliferation of dermal fibroblasts promoted by PES, suggesting that PDGFA expression, an early response of PES, was involved in promoting the cell proliferation. Therefore, PES at 4800 Hz may initially promote PDGFA expression and subsequently stimulate the expression of two other growth factors, resulting in dermal fibroblast proliferation after 24 h or later. In conclusion, PES may activate the cell growth phase of wound healing.
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Affiliation(s)
- Hiroya Urabe
- Homer Ion Laboratory Co., Ltd., 17-2 Shinsen-cho, Shibuya-ku, Tokyo, 150-0045, Japan.
| | - Ryuji Akimoto
- Homer Ion Laboratory Co., Ltd., 17-2 Shinsen-cho, Shibuya-ku, Tokyo, 150-0045, Japan
| | - Shohei Kamiya
- Homer Ion Laboratory Co., Ltd., 17-2 Shinsen-cho, Shibuya-ku, Tokyo, 150-0045, Japan
| | - Katsu Hosoki
- Homer Ion Laboratory Co., Ltd., 17-2 Shinsen-cho, Shibuya-ku, Tokyo, 150-0045, Japan
| | - Hideyuki Ichikawa
- Homer Ion Laboratory Co., Ltd., 17-2 Shinsen-cho, Shibuya-ku, Tokyo, 150-0045, Japan
| | - Toshio Nishiyama
- Homer Ion Laboratory Co., Ltd., 17-2 Shinsen-cho, Shibuya-ku, Tokyo, 150-0045, Japan.,Scleroprotein Research Institute, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, 183-8509, Japan
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7
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Keratinocyte electrotaxis induced by physiological pulsed direct current electric fields. Bioelectrochemistry 2019; 127:113-124. [DOI: 10.1016/j.bioelechem.2019.02.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2018] [Revised: 02/01/2019] [Accepted: 02/01/2019] [Indexed: 02/02/2023]
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Aoki M, Matsumoto NM, Okubo Y, Ogawa R. Cytochrome P450 genes play central roles in transcriptional response by keratinocytes to a high-voltage alternating current electric field. Bioelectrochemistry 2019; 126:163-171. [DOI: 10.1016/j.bioelechem.2018.11.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 11/29/2018] [Accepted: 11/30/2018] [Indexed: 01/01/2023]
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Jeong GJ, Oh JY, Kim YJ, Bhang SH, Jang HK, Han J, Yoon JK, Kwon SM, Lee TI, Kim BS. Therapeutic Angiogenesis via Solar Cell-Facilitated Electrical Stimulation. ACS APPLIED MATERIALS & INTERFACES 2017; 9:38344-38355. [PMID: 29043772 DOI: 10.1021/acsami.7b13322] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Cell therapy has been suggested as a treatment modality for ischemic diseases, but the poor survival and engraftment of implanted cells limit its therapeutic efficacy. To overcome such limitation, we used electrical stimulation (ES) derived from a wearable solar cell for inducing angiogenesis in ischemic tissue. ES enhanced the secretion of angiogenic growth factors and the migration of mesenchymal stem cells (MSCs), myoblasts, endothelial progenitor cells, and endothelial cells in vitro. In a mouse ischemic hindlimb model, ES generated by a solar cell and applied to the ischemic region promoted migration of MSCs toward the ischemic site and upregulated expression of angiogenic paracrine factors (vascular endothelial, basic fibroblast, and hepatocyte growth factors; and stromal cell-derived factor-1α). Importantly, solar cell-generated ES promoted the formation of capillaries and arterioles at the ischemic region, attenuated muscle necrosis and fibrosis, and eventually prevented loss of the ischemic limb. Solar cell ES therapy showed higher angiogenic efficacy than conventional MSC therapy. This study shows the feasibility of using solar cell ES as a novel treatment for therapeutic angiogenesis.
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Affiliation(s)
| | - Jin Young Oh
- Department of Materials Science and Engineering, Yonsei University , Seoul 03722, Republic of Korea
| | - Yeon-Ju Kim
- Department of Physiology, School of Medicine, Pusan National University , Yangsan, 50612 Republic of Korea
| | - Suk Ho Bhang
- School of Chemical Engineering, Sungkyunkwan University , Suwon 16419, Republic of Korea
| | | | | | | | - Sang-Mo Kwon
- Department of Physiology, School of Medicine, Pusan National University , Yangsan, 50612 Republic of Korea
| | - Tae Il Lee
- Department of BioNano Technology, Gachon University , Seongnam 13120, Republic of Korea
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Boutrand LB, Thépot A, Muther C, Boher A, Robic J, Guéré C, Vié K, Damour O, Lamartine J. Repeated short climatic change affects the epidermal differentiation program and leads to matrix remodeling in a human organotypic skin model. Clin Cosmet Investig Dermatol 2017; 10:43-50. [PMID: 28243135 PMCID: PMC5315211 DOI: 10.2147/ccid.s120800] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Human skin is subject to frequent changes in ambient temperature and humidity and needs to cope with these environmental modifications. To decipher the molecular response of human skin to repeated climatic change, a versatile model of skin equivalent subject to “hot–wet” (40°C, 80% relative humidity [RH]) or “cold–dry” (10°C, 40% RH) climatic stress repeated daily was used. To obtain an exhaustive view of the molecular mechanisms elicited by climatic change, large-scale gene expression DNA microarray analysis was performed and modulated function was determined by bioinformatic annotation. This analysis revealed several functions, including epidermal differentiation and extracellular matrix, impacted by repeated variations in climatic conditions. Some of these molecular changes were confirmed by histological examination and protein expression. Both treatments (hot–wet and cold–dry) reduced the expression of genes encoding collagens, laminin, and proteoglycans, suggesting a profound remodeling of the extracellular matrix. Strong induction of the entire family of late cornified envelope genes after cold–dry exposure, confirmed at protein level, was also observed. These changes correlated with an increase in epidermal differentiation markers such as corneodesmosin and a thickening of the stratum corneum, indicating possible implementation of defense mechanisms against dehydration. This study for the first time reveals the complex pattern of molecular response allowing adaption of human skin to repeated change in its climatic environment.
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Affiliation(s)
| | | | - Charlotte Muther
- CNRS UMR5305, Laboratoire de Biologie Tissulaire et d'Ingénierie Thérapeutique (LBTI), Lyon
| | | | | | | | | | - Odile Damour
- Banque de Tissus et Cellules, Hospices Civiles de Lyon, Lyon, France
| | - Jérôme Lamartine
- Departement de Biologie, Université Claude Bernard Lyon I; CNRS UMR5305, Laboratoire de Biologie Tissulaire et d'Ingénierie Thérapeutique (LBTI), Lyon
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11
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Hayashi H, Edin F, Li H, Liu W, Rask-Andersen H. The effect of pulsed electric fields on the electrotactic migration of human neural progenitor cells through the involvement of intracellular calcium signaling. Brain Res 2016; 1652:195-203. [PMID: 27746154 DOI: 10.1016/j.brainres.2016.09.043] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 08/07/2016] [Accepted: 09/27/2016] [Indexed: 01/15/2023]
Abstract
Endogenous electric fields (EFs) are required for the physiological control of the central nervous system development. Application of the direct current EFs to neural stem cells has been studied for the possibility of stem cell transplantation as one of the therapies for brain injury. EFs generated within the nervous system are often associated with action potentials and synaptic activity, apparently resulting in a pulsed current in nature. The aim of this study is to investigate the effect of pulsed EF, which can reduce the cytotoxicity, on the migration of human neural progenitor cells (hNPCs). We applied the mono-directional pulsed EF with a strength of 250mV/mm to hNPCs for 6h. The migration distance of the hNPCs exposed to pulsed EF was significantly greater compared with the control not exposed to the EF. Pulsed EFs, however, had less of an effect on the migration of the differentiated hNPCs. There was no significant change in the survival of hNPCs after exposure to the pulsed EF. To investigate the role of Ca2+ signaling in electrotactic migration of hNPCs, pharmacological inhibition of Ca2+ channels in the EF-exposed cells revealed that the electrotactic migration of hNPCs exposed to Ca2+ channel blockers was significantly lower compared to the control group. The findings suggest that the pulsed EF induced migration of hNPCs is partly influenced by intracellular Ca2+ signaling.
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Affiliation(s)
- Hisamitsu Hayashi
- Department of Surgical Sciences, Head and Neck Surgery, Section of Otolaryngology, Uppsala University Hospital, SE-751 85 Uppsala, Sweden; Department of Otolaryngology, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu 501-1194, Japan.
| | - Fredrik Edin
- Department of Surgical Sciences, Head and Neck Surgery, Section of Otolaryngology, Uppsala University Hospital, SE-751 85 Uppsala, Sweden.
| | - Hao Li
- Department of Surgical Sciences, Head and Neck Surgery, Section of Otolaryngology, Uppsala University Hospital, SE-751 85 Uppsala, Sweden.
| | - Wei Liu
- Department of Surgical Sciences, Head and Neck Surgery, Section of Otolaryngology, Uppsala University Hospital, SE-751 85 Uppsala, Sweden.
| | - Helge Rask-Andersen
- Department of Surgical Sciences, Head and Neck Surgery, Section of Otolaryngology, Uppsala University Hospital, SE-751 85 Uppsala, Sweden.
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Xiong GM, Yuan S, Wang JK, Do AT, Tan NS, Yeo KS, Choong C. Imparting electroactivity to polycaprolactone fibers with heparin-doped polypyrrole: Modulation of hemocompatibility and inflammatory responses. Acta Biomater 2015; 23:240-249. [PMID: 25983317 DOI: 10.1016/j.actbio.2015.05.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 04/14/2015] [Accepted: 05/07/2015] [Indexed: 10/23/2022]
Abstract
Hemocompatibility, anti-inflammation and anti-thrombogenicity of acellular synthetic vascular grafts remains a challenge in biomaterials design. Using electrospun polycaprolactone (PCL) fibers as a template, a coating of polypyrrole (PPy) was successfully polymerized onto the fiber surface. The fibers coated with heparin-doped PPy (PPy-HEP) demonstrated better electroactivity, lower surface resistivity (9-10-fold) and better anti-coagulation response (non-observable plasma recalcification after 30min vs. recalcification at 8-9min) as compared to fibers coated with pristine PPy. Red blood cell compatibility, measured by% hemolysis, was greatly improved on PPy-HEP-coated PCL in comparison to uncoated PCL (3.9±2.1% vs. 22.1±4.1%). PPy-HEP-coated PCL fibers also exhibited higher stiffness values (6.8±0.9MPa vs. 4.2±0.8MPa) as compared to PCL fibers, but similar tensile strengths. It was also observed that the application of a low alternating current led to a 4-fold reduction of platelet activation (as quantitated by CD62p expression) for the PPy-HEP-coated fibers as compared to non-stimulated conditions. In parallel, a reduction in the leukocyte adhesion to both pristine PPy-coated and PPy-HEP-coated fibers was observable with AC stimulation. Overall, a new strategy involving the use of hemocompatible conducting polymers and electrical stimulation to control thrombogenicity and inflammatory responses for synthetic vascular graft designs was demonstrated.
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Jin G, Prabhakaran MP, Ramakrishna S. Photosensitive and biomimetic core-shell nanofibrous scaffolds as wound dressing. Photochem Photobiol 2014; 90:673-81. [PMID: 24417712 DOI: 10.1111/php.12238] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 01/06/2014] [Indexed: 12/19/2022]
Abstract
Tissue engineered skin grafts that mimic the native extracellular matrix of skin has gained huge popularity among clinicians since they increase the survival rate of the patients. Phototherapy shows promising results with respect to acute and chronic pain relief, treatment of inflammatory conditions and promotion of wound healing. Here, we encapsulated a photosensitive polymer poly (3-hexylthiophene) (P3HT) and epidermal growth factor in the core-shell-structured Gelatin/poly(L-lactic acid)-co-poly-(ε-caprolactone) nanofibers [Gel/PLLCL/P3GF(cs)] by coaxial spinning and studied the potential application of the Gel/PLLCL/P3GF(cs) nanofibrous scaffold as a novel skin graft. The proliferation of fibroblasts was significantly improved on Gel/PLLCL/P3GF(cs) under light stimulation compared to fibroblasts on the same scaffold under dark condition. Studies on the in vitro wound healing ability of Gel/PLLCL/P3GF(cs) showed complete closure of wound after 9 days under "light stimulation" too. Furthermore, the potential of adipose-derived stem cells (ASCs) to differentiate to epidermal cells on Gel/PLLCL/P3GF(cs) was evaluated. The differentiated ASCs with keratinocytes morphology were only found on the light stimulated Gel/PLLCL/P3GF(cs). Our results suggest that the photosensitive core-shell Gel/PLLCL/P3GF(cs) nanofibers could be a novel substrate to aid in the reestablishment of skin architecture.
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Affiliation(s)
- Guorui Jin
- Department of Mechanical Engineering, National University of Singapore, Singapore; Center for Nanofibers and Nanotechnology, E3-05-14, Nanoscience and Nanotechnology Initiative, Faculty of Engineering, National University of Singapore, Singapore
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