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Bae K, Kang G, Cho SK, Park W, Kim K, Padilla WJ. Flexible thin-film black gold membranes with ultrabroadband plasmonic nanofocusing for efficient solar vapour generation. Nat Commun 2015; 6:10103. [PMID: 26657535 PMCID: PMC4682046 DOI: 10.1038/ncomms10103] [Citation(s) in RCA: 281] [Impact Index Per Article: 31.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 10/30/2015] [Indexed: 12/25/2022] Open
Abstract
Solar steam generation has been achieved by surface plasmon heating with metallic nanoshells or nanoparticles, which have inherently narrow absorption bandwidth. For efficient light-to-heat conversion from a wider solar spectrum, we employ adiabatic plasmonic nanofocusing to attain both polarization-independent ultrabroadband light absorption and high plasmon dissipation loss. Here we demonstrate large area, flexible thin-film black gold membranes, which have multiscale structures of varying metallic nanoscale gaps (0-200 nm) as well as microscale funnel structures. The adiabatic nanofocusing of self-aggregated metallic nanowire bundle arrays produces average absorption of 91% at 400-2,500 nm and the microscale funnel structures lead to average reflection of 7% at 2.5-17 μm. This membrane allows heat localization within the few micrometre-thick layer and continuous water provision through micropores. We efficiently generate water vapour with solar thermal conversion efficiency up to 57% at 20 kW m(-2). This new structure has a variety of applications in solar energy harvesting, thermoplasmonics and related technologies.
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Affiliation(s)
- Kyuyoung Bae
- School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea
| | - Gumin Kang
- School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea
| | - Suehyun K. Cho
- Department of Electrical, Computer & Energy Engineering and Materials Science & Engineering Program, University of Colorado, Boulder, Colorado 80309, USA
| | - Wounjhang Park
- Department of Electrical, Computer & Energy Engineering and Materials Science & Engineering Program, University of Colorado, Boulder, Colorado 80309, USA
| | - Kyoungsik Kim
- School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea
| | - Willie J. Padilla
- Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA
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Popoca-Cuaya M, Diaz-Chavez J, Hernandez-Monge J, Alvarez-Rios E, Lambert PF, Gariglio P. The HPV16 E6 oncoprotein and UVB irradiation inhibit the tumor suppressor TGFβ pathway in the epidermis of the K14E6 transgenic mouse. Exp Dermatol 2015; 24:430-5. [DOI: 10.1111/exd.12689] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/04/2015] [Indexed: 12/18/2022]
Affiliation(s)
- Marco Popoca-Cuaya
- Department of Genetics and Molecular Biology; Centro de Investigación y de Estudios Avanzados (CINVESTAV); Mexico City Mexico
| | - Jose Diaz-Chavez
- Unit of Biomedical Research in Cancer; UNAM/Instituto Nacional de Cancerología (INCan); Mexico City Mexico
| | - Jesus Hernandez-Monge
- Department of Genetics and Molecular Biology; Centro de Investigación y de Estudios Avanzados (CINVESTAV); Mexico City Mexico
| | - Elizabeth Alvarez-Rios
- Department of Genetics and Molecular Biology; Centro de Investigación y de Estudios Avanzados (CINVESTAV); Mexico City Mexico
| | - Paul F. Lambert
- McArdle Laboratory for Cancer Research; University of Wisconsin School of Medicine and Public Health; Madison WI USA
| | - Patricio Gariglio
- Department of Genetics and Molecular Biology; Centro de Investigación y de Estudios Avanzados (CINVESTAV); Mexico City Mexico
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Sattayakhom A, Chunglok W, Ittarat W, Chamulitrat W. Study designs to investigate Nox1 acceleration of neoplastic progression in immortalized human epithelial cells by selection of differentiation resistant cells. Redox Biol 2013; 2:140-7. [PMID: 24494188 PMCID: PMC3909263 DOI: 10.1016/j.redox.2013.12.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 12/10/2013] [Accepted: 12/11/2013] [Indexed: 10/25/2022] Open
Abstract
To investigate the role of NADPH oxidase homolog Nox1 at an early step of cell transformation, we utilized human gingival mucosal keratinocytes immortalized by E6/E7 of human papillomavirus (HPV) type 16 (GM16) to generate progenitor cell lines either by chronic ethanol exposure or overexpression with Nox1. Among several cobblestone epithelial cell lines obtained, two distinctive spindle cell lines - FIB and NuB1 cells were more progressively transformed exhibiting tubulogenesis and anchorage-independent growth associated with increased invasiveness. These spindle cells acquired molecular markers of epithelial mesenchymal transition (EMT) including mesenchymal vimentin and simple cytokeratins (CK) 8 and 18 as well as myogenic alpha-smooth muscle actin and caldesmon. By overexpression and knockdown experiments, we showed that Nox1 on a post-translational level regulated the stability of CK18 in an ROS-, phosphorylation- and PKCepilon-dependent manner. PKCepilon may thus be used as a therapeutic target for EMT inhibition. Taken together, Nox1 accelerates neoplastic progression by regulating structural intermediate filaments leading to EMT of immortalized human gingival epithelial cells.
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Key Words
- AIG, anchorage-independent growth
- CK, cytokeratin
- Cobblestone cells
- Cytokeratins
- EGF, epidermal growth factor
- EMT
- EMT, epithelial mesenchymal transition
- GM, gingival mucosal
- HPV, human papillomavirus
- IAP, inhibitor of apoptosis protein
- Immortalized gingival keratinocytes
- Intermediate filaments
- Invasion
- MEF2, myocyte enhancing factor 2
- MMP, matrix metalloproteinases
- Nox, NAD(P)H oxidase
- PMA, 12-O- tetradecanoylphorbol-13-acetate
- ROS, reactive oxygen species
- Spindle cells
- iNOS, inducible nitric oxide synthase
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Affiliation(s)
- Apsorn Sattayakhom
- School of Allied Health Sciences and Public Health, Walailak University, Nakhon Si Thammarat, Thailand
| | - Warangkana Chunglok
- School of Allied Health Sciences and Public Health, Walailak University, Nakhon Si Thammarat, Thailand
| | - Wanida Ittarat
- Faculty of Medical Technology, Mahidol University, Bangkok, Thailand
| | - Walee Chamulitrat
- Department of Internal Medicine IV, University Heidelberg Hospital, Heidelberg, Germany
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Nzengue Y, Steiman R, Rachidi W, Favier A, Guiraud P. Oxidative stress induced by cadmium in the C6 cell line: role of copper and zinc. Biol Trace Elem Res 2012; 146:410-9. [PMID: 22127830 DOI: 10.1007/s12011-011-9265-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2011] [Accepted: 11/07/2011] [Indexed: 11/29/2022]
Abstract
In this report, we have investigated the role of copper (Cu) and zinc (Zn) in oxidative stress induced by cadmium (Cd) in C6 cells. Cells were exposed to 20 μM Cd, 500 μM Cu, and 450 μM Zn for 24 h. Then, toxic effects, cellular metals levels, oxidative stress parameters, cell death, as well as DNA damage were evaluated. Cd induced an increase in cellular Cd, Cu, and Zn levels. This results not only in the inhibition of GSH-Px, GRase, CAT, and SOD activities but also in ROS overproduction, oxidative damage, and apoptotic cell death not related to Cu and Zn mechanisms. The thiol groups and GSH levels decreased, whereas the lipid peroxidation and DNA damage increased. The toxicity of Zn results from the imbalance between the inhibition of antioxidant activities and the induction of MT synthesis. The increase in Cu and Zn levels could be explained by the disruption of specific transporter activities, Cd interference with signaling pathways, and metal displacement. Our results suggest that the alteration of Cu and Zn homeostasis is involved in the oxidative stress induced by Cd.
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Affiliation(s)
- Yves Nzengue
- INAC/SCIB UMR-E3 CEA/UJF, Laboratoire Lésions des Acides Nucléiques, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France.
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Chamulitrat W, Sattayakhom A, Herold-Mended C, Stremmel W. Human papillomavirus 16 E6/E7-immortalized human gingival keratinocytes with epithelial mesenchymal transition acquire increased expression of cIAP-1, Bclx and p27Kip1. Exp Dermatol 2009; 18:1067-9. [DOI: 10.1111/j.1600-0625.2009.00888.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kim S, Lee Y, Lee DH, Kim Y, Cho KH, Chung JH. Basal and UV-induced MMP-1 expression are inhibited by p53 in human dermal fibroblasts. Exp Dermatol 2008; 17:939-45. [DOI: 10.1111/j.1600-0625.2008.00729.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Mitchell D, Paniker L, Sanchez G, Bella Z, Garaczi E, Szell M, Hamid Q, Kemeny L, Koreck A. Molecular response of nasal mucosa to therapeutic exposure to broad-band ultraviolet radiation. J Cell Mol Med 2008; 14:313-22. [PMID: 18671762 PMCID: PMC3837592 DOI: 10.1111/j.1582-4934.2008.00442.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Ultraviolet radiation (UVR) phototherapy is a promising new treatment for inflammatory airway diseases. However, the potential carcinogenic risks associated with this treatment are not well understood. UV-specific DNA photoproducts were used as biomarkers to address this issue. Radioimmunoassay was used to quantify cyclobutane pyrimidine dimers (CPDs) and (6–4) photoproducts in DNA purified from two milieus: nasal mucosa samples from subjects exposed to intranasal phototherapy and human airway (EpiAirway™) and human skin (EpiDerm™) tissue models. Immunohistochemistry was used to detect CPD formation and persistence in human nasal biopsies and human tissue models. In subjects exposed to broadband ultraviolet radiation, DNA damage frequencies were determined prior to as well as immediately after treatment and at increasing times post-treatment. We observed significant levels of DNA damage immediately after treatment and efficient removal of the damage within a few days. No residual damage was observed in human subjects exposed to multiple UVB treatments several weeks after the last treatment. To better understand the molecular response of the nasal epithelium to DNA damage, parallel experiments were conducted in EpiAirway and EpiDerm model systems. Repair rates in these two tissues were very similar and comparable to that observed in human skin. The data suggest that the UV-induced DNA damage response of respiratory epithelia is very similar to that of the human epidermis and that nasal mucosa is able to efficiently repair UVB induced DNA damage.
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Affiliation(s)
- David Mitchell
- Department of Carcinogenesis, University of Texas MD Anderson Cancer Center, Smithville, TX 78957, USA.
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Mnich CD, Hoek KS, Virkki LV, Farkas A, Dudli C, Laine E, Urosevic M, Dummer R. Green tea extract reduces induction of p53 and apoptosis in UVB-irradiated human skin independent of transcriptional controls. Exp Dermatol 2008; 18:69-77. [PMID: 18631247 DOI: 10.1111/j.1600-0625.2008.00765.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Ultraviolet (UV) irradiation plays a pivotal role in human skin carcinongenesis. Preclinically, systemically and topically applied green tea extract (GTE) has shown reduction of UV-induced (i) erythema, (ii) DNA damage, (iii) formation of radical oxygen species and (iv) downregulation of numerous factors related to apoptosis, inflammation, differentiation and carcinogenesis. In humans, topical GTE has so far only been tested in limited studies, with usually very high GTE concentrations and over short periods of time. Both chemical stability of GTE and staining properties of highly concentrated green tea polyphenols limit the usability of highly concentrated green tea extracts in cosmetic products. The present study tested the utility of stabilized low-dose GTE as photochemopreventive agents under everyday conditions. We irradiated with up to 100 mJ/cm(2) of UVB light skin patches which were pretreated with either OM24-containing lotion or a placebo lotion. Biopsies were taken from both irradiated and un-irradiated skin for both immunohistochemistry and DNA microarray analysis. We found that while OM24 treatment did not significantly affect UV-induced erythema and thymidine dimer formation, OM24 treatment significantly reduced UV-induced p53 expression in keratinocytes. We also found that OM24 treatment significantly reduced the number of apoptotic keratinocytes (sunburn cells and TUNEL-positive cells). Carefully controlled DNA microarray analyses showed that OM24 treatment does not induce off-target changes in gene expression, reducing the likelihood of unwanted side-effects. Topical GTE (OM24) reduces UVB-mediated epithelial damage already at low, cosmetically usable concentrations, without tachyphylaxis over 5 weeks, suggesting GTE as suitable everyday photochemopreventive agents.
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Affiliation(s)
- Christian D Mnich
- Department of Dermatology, University Hospital of Zurich, Zurich, Switzerland
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Faurschou A, Gniadecki R, Wulf HC. Infliximab inhibits DNA repair in ultraviolet B-irradiated premalignant keratinocytes. Exp Dermatol 2008; 17:933-8. [PMID: 18557931 DOI: 10.1111/j.1600-0625.2008.00727.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Anti-tumor necrosis factor-alpha (TNFalpha) approaches are increasingly used in the therapy of autoimmune diseases. One of the safety concerns is the potential enhancement of skin carcinogenesis. The aim of this study was to investigate if the TNFalpha neutralizing antibody, infliximab, directly affects the cell cycle and DNA repair in premalignant human keratinocytes after ultraviolet-B (UVB) irradiation. We found that infliximab-treated cells exhibited an enhanced G2/M cell cycle arrest and increased apoptosis after 10-20 mJ/cm(2) UVB. In spite of this, the level of cyclobutane pyrimidine dimers (CPD) in infliximab-treated cells was significantly increased at both 24 and 48 h after irradiation with 10 mJ/cm(2) UVB. As we have recently shown that protein kinase B/Akt is involved in the TNFalpha signalling pathway and promotes cell survival and skin carcinogenesis, we measured activatory phosphorylations of Akt (Ser-473 and Thr-308) and the signalling via related pathways Erk 1/2, p38 and p70-S6K. Infliximab inhibited Akt and its downstream targets p70-S6K and Erk 1/2, and stimulated p38 both in sham-irradiated and UVB-irradiated cells. In conclusion, despite the fact that infliximab blocks Akt and stimulates the G2/M checkpoint and apoptosis in UVB-irradiated keratinocytes, the repair of CPD is impaired. It is conceivable that anti-TNFalpha treatments may contribute to the accumulation of mutagenic lesions in the epidermis and enhance the early stages of skin carcinogenesis.
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Affiliation(s)
- Annesofie Faurschou
- Department of Dermatology, University of Copenhagen, Bispebjerg Hospital, Copenhagen, Denmark.
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Nzengue Y, Steiman R, Guiraud P. Characterization of the cell death induced by cadmium in HaCaT and C6 cell lines. Free Radic Res 2008; 42:142-53. [PMID: 18297607 DOI: 10.1080/10715760701837100] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Cell death resulting from cadmium (Cd) intoxication has been confirmed to induce both necrosis and apoptosis. The ratio between both types of cell death is dose- and cell-type-dependent. This study used the human keratinocytes HaCaT expressing a mutated p53 and the rat glial cells C6 expressing a wild p53 as models to characterize Cd-induced apoptosis, using sub-lethal and lethal doses. At these concentrations, features of apoptosis were observed 24 h after C6 cell treatment: apoptotic DNA fragmentation and caspase-9 activation, whereas Cd did not induce caspase-3. In HaCaT, Cd did not induce apoptotic DNA fragmentation or caspase-9 and -3 activation. The results also showed that the inhibition of p53 led to a resistance of the C6 cells to 20 microm Cd, decreased the apoptosis and increased the metallothioneins in these cells. p53 restoration increased the sensitivity of HaCaT cells to Cd but did not affect the MT expression. The results suggest that Cd induced apoptosis in C6 cells but a non-apoptotic cellular death in HaCaT cells.
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Affiliation(s)
- Yves Nzengue
- Université Joseph Fourier, Domaine de La Merci, La Tronche, France
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Yamaguchi Y, Coelho SG, Zmudzka BZ, Takahashi K, Beer JZ, Hearing VJ, Miller SA. Cyclobutane pyrimidine dimer formation and p53 production in human skin after repeated UV irradiation. Exp Dermatol 2008; 17:916-24. [PMID: 18363705 DOI: 10.1111/j.1600-0625.2008.00722.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Substantial differences in DNA damage caused by a single UV irradiation were found in our previous study on skin with different levels of constitutive pigmentation. In this study, we assessed whether facultative pigmentation induced by repeated UV irradiation is photoprotective. Three sites on the backs of 21 healthy subjects with type II-III skin were irradiated at 100-600 J/m(2) every 2-7 days over a 4- to 5-week period. The three sites received different cumulative doses of UV (1900, 2900 or 4200 J/m(2)) and were biopsied 1 day after the last irradiation. Biomarkers examined included pigment content assessed by Fontana-Masson staining, melanocyte function by expression of melanocyte-specific markers, DNA damage as cyclobutane pyrimidine dimers (CPD), nuclear accumulation of p53, apoptosis determined by TUNEL assay, and levels of p21 and Ser46-phosphorylated p53. Increases in melanocyte function and density, and in levels of apoptosis were similar among the 3 study sites irradiated with different cumulative UV doses. Levels of CPD decreased while the number of p53-positive cells increased as the cumulative dose of UV increased. These results suggest that pigmentation induced in skin by repeated UV irradiation protects against subsequent UV-induced DNA damage but not as effectively as constitutive pigmentation.
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Affiliation(s)
- Yuji Yamaguchi
- Laboratory of Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
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