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Popescu I, Constantin M, Solcan G, Ichim DL, Rata DM, Horodincu L, Solcan C. Composite Hydrogels with Embedded Silver Nanoparticles and Ibuprofen as Wound Dressing. Gels 2023; 9:654. [PMID: 37623109 PMCID: PMC10454181 DOI: 10.3390/gels9080654] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/02/2023] [Accepted: 08/11/2023] [Indexed: 08/26/2023] Open
Abstract
The wound healing process is often slowed down as a result of complications from bacterial infections and inflammatory reactions. Therefore, it is necessary to develop dressings with fast antibacterial and anti-inflammatory activity that shorten the wound healing period by promoting cell migration and proliferation. Chitosan (CS)-based hydrogels have been widely studied for their antibacterial and wound healing capabilities. Herein, we developed a composite hydrogel based on CS and PVA embedding silver nanoparticles (AgNPs) with antibacterial properties and ibuprofen (Ib) as an anti-inflammatory agent. The hydrogel prepared by double physical cross-linking, with oxalic acid and by freeze-thawing, loaded with 0.225 wt.% AgNPs and 0.264 wt.% Ib, displayed good mechanical properties (compressive modulus = 132 kPa), a high swelling degree and sustained drug delivery (in simulated skin conditions). Moreover, the hydrogel showed strong antibacterial activity against S. aureus and K. pneumoniae due to the embedded AgNPs. In vivo, this hydrogel accelerated the wound regeneration process through the enhanced expression of TNF alpha IP8, by activating downstream cascades and supporting the healing process of inflammation; Cox2, which enhances the migration and proliferation of cells involved in re-epithelization and angiogenesis; MHCII, which promotes immune cooperation between local cells, eliminating dead tissue and controlling infection; the intense expression of Col I as a major marker in the tissue granulation process; and αSMA, which marks the presence of myofibroblasts involved in wound closure and indicates ongoing re-epithelization. The results reveal the potential healing effect of CS/PVA/AgNPs/Ib hydrogels and suggest their potential use as wound dressings.
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Affiliation(s)
- Irina Popescu
- “Petru Poni” Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania; (I.P.); (M.C.)
| | - Marieta Constantin
- “Petru Poni” Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, 700487 Iasi, Romania; (I.P.); (M.C.)
| | - Gheorghe Solcan
- Faculty of Veterinary Medicine, “Ion Ionescu de la Brad” Iasi University of Life Sciences, 700489 Iasi, Romania; (G.S.); (L.H.)
| | - Daniela Luminita Ichim
- Faculty of Medical Dentistry, “Apollonia” University of Iasi, 700511 Iasi, Romania; (D.L.I.); (D.M.R.)
| | - Delia Mihaela Rata
- Faculty of Medical Dentistry, “Apollonia” University of Iasi, 700511 Iasi, Romania; (D.L.I.); (D.M.R.)
| | - Loredana Horodincu
- Faculty of Veterinary Medicine, “Ion Ionescu de la Brad” Iasi University of Life Sciences, 700489 Iasi, Romania; (G.S.); (L.H.)
| | - Carmen Solcan
- Faculty of Veterinary Medicine, “Ion Ionescu de la Brad” Iasi University of Life Sciences, 700489 Iasi, Romania; (G.S.); (L.H.)
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Touni AA, Shivde RS, Echuri H, Abdel-Aziz RTA, Abdel-Wahab H, Kundu RV, Le Poole IC. Melanocyte-keratinocyte cross-talk in vitiligo. Front Med (Lausanne) 2023; 10:1176781. [PMID: 37275386 PMCID: PMC10235633 DOI: 10.3389/fmed.2023.1176781] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 04/27/2023] [Indexed: 06/07/2023] Open
Abstract
Vitiligo is a common acquired pigmentary disorder that presents as progressive loss of melanocytes from the skin. Epidermal melanocytes and keratinocytes are in close proximity to each other, forming a functional and structural unit where keratinocytes play a pivotal role in supporting melanocyte homeostasis and melanogenesis. This intimate relationship suggests that keratinocytes might contribute to ongoing melanocyte loss and subsequent depigmentation. In fact, keratinocyte dysfunction is a documented phenomenon in vitiligo. Keratinocyte apoptosis can deprive melanocytes from growth factors including stem cell factor (SCF) and other melanogenic stimulating factors which are essential for melanocyte function. Additionally, keratinocytes control the mobility/stability phases of melanocytes via matrix metalloproteinases and basement membrane remodeling. Hence keratinocyte dysfunction may be implicated in detachment of melanocytes from the basement membrane and subsequent loss from the epidermis, also potentially interfering with repigmentation in patients with stable disease. Furthermore, keratinocytes contribute to the autoimmune insult in vitiligo. Keratinocytes express MHC II in perilesional skin and may present melanosomal antigens in the context of MHC class II after the pigmented organelles have been transferred from melanocytes. Moreover, keratinocytes secrete cytokines and chemokines including CXCL-9, CXCL-10, and IL-15 that amplify the inflammatory circuit within vitiligo skin and recruit melanocyte-specific, skin-resident memory T cells. In summary, keratinocytes can influence vitiligo development by a combination of failing to produce survival factors, limiting melanocyte adhesion in lesional skin, presenting melanocyte antigens and enhancing the recruitment of pathogenic T cells.
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Affiliation(s)
- Ahmed Ahmed Touni
- Department of Dermatology, Faculty of Medicine, Minia University, Minia, Egypt
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Rohan S. Shivde
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Harika Echuri
- Department of Dermatology, Emory University, Atlanta, GA, United States
| | | | - Hossam Abdel-Wahab
- Department of Dermatology, Faculty of Medicine, Minia University, Minia, Egypt
| | - Roopal V. Kundu
- Department of Dermatology, Faculty of Medicine, Minia University, Minia, Egypt
| | - I. Caroline Le Poole
- Department of Dermatology, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
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Simard M, Tremblay A, Morin S, Martin C, Julien P, Fradette J, Flamand N, Pouliot R. α-Linolenic acid and linoleic acid modulate the lipidome and the skin barrier of a tissue-engineered skin model. Acta Biomater 2022; 140:261-274. [PMID: 34808417 DOI: 10.1016/j.actbio.2021.11.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 11/15/2021] [Accepted: 11/16/2021] [Indexed: 12/18/2022]
Abstract
Polyunsaturated fatty acids (PUFAs) play an important role in the establishment and the maintenance of the skin barrier function. However, the impact of their derived lipid mediators remains unclear. Skin substitutes were engineered according to the self-assembly method with a culture medium supplemented with 10 μM of both α-linolenic acid (ALA) and linoleic acid (LA). The supplementation with ALA and LA decreased testosterone absorption through a tissue-engineered reconstructed skin model, thus indicating an improved skin barrier function following supplementation. The exogenously provided fatty acids were incorporated into the phospholipid and triglyceride fractions of the skin substitutes. Indeed, the dual supplementation increased the levels of eicosapentaenoic acid (EPA) (15-fold), docosapentaenoic acid (DPA) (3-fold), and LA (1.5-fold) in the epidermal phospholipids while it increased the levels of ALA (>20-fold), DPA (3-fold) and LA (1.5-fold) in the epidermal triglycerides. The bioactive lipid mediator profile of the skin substitutes, including prostaglandins, hydroxy-fatty acids, N-acylethanolamines and monoacylglycerols, was next analyzed using liquid chromatography-tandem mass spectrometry. The lipid supplementation further modulated bioactive lipid mediator levels of the reconstructed skin substitutes, leading to a lipid mediator profile more representative of the one found in normal human skin. These findings show that an optimized supply of PUFAs via culture media is essential for the establishment of improved barrier function in vitro. STATEMENT OF SIGNIFICANCE: Supplementation of the culture medium with 10 μM of both α-linolenic acid (ALA) and linoleic acid (LA) improved the skin barrier function of a tissue-engineered skin model. The exogenously provided fatty acids were incorporated into the phospholipid and triglyceride fractions of the skin substitutes and further modulated bioactive lipid mediator levels, including prostaglandins, hydroxy-fatty acids, N-acylethanolamines and monoacylglycerols. These findings highlight the important role of ALA and LA in skin homeostasis and show that an optimized supply of polyunsaturated fatty acids via culture media is essential for the establishment of improved barrier function in vitro.
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Affiliation(s)
- Mélissa Simard
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Axe médecine régénératrice, Centre de recherche du CHU de Québec-Université Laval, Québec, QC, G1J 1Z4, Canada; Faculté de pharmacie de l'Université Laval, Québec, QC, G1J 1A4, Canada
| | - Andréa Tremblay
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Axe médecine régénératrice, Centre de recherche du CHU de Québec-Université Laval, Québec, QC, G1J 1Z4, Canada; Faculté de pharmacie de l'Université Laval, Québec, QC, G1J 1A4, Canada
| | - Sophie Morin
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Axe médecine régénératrice, Centre de recherche du CHU de Québec-Université Laval, Québec, QC, G1J 1Z4, Canada; Faculté de pharmacie de l'Université Laval, Québec, QC, G1J 1A4, Canada
| | - Cyril Martin
- Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, QC, G1V 4G5, Canada; Canada Excellence Research Chair on the Microbiome-Endocannabinoidome Axis in Metabolic Health (CERC-MEND), Université Laval, Québec, QC, Canada
| | - Pierre Julien
- Département de médecine, Faculté de médecine de l'Université Laval, Québec, QC, G1V 0A6, Canada; Axe Endocrinologie et Néphrologie, Centre de recherche du CHU de Québec, Université Laval, Québec, QC, G1J 1A4, Canada
| | - Julie Fradette
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Axe médecine régénératrice, Centre de recherche du CHU de Québec-Université Laval, Québec, QC, G1J 1Z4, Canada; Département de chirurgie, Faculté de médecine de l'Université Laval, Québec, QC, G1V 0A6, Canada
| | - Nicolas Flamand
- Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, QC, G1V 4G5, Canada; Canada Excellence Research Chair on the Microbiome-Endocannabinoidome Axis in Metabolic Health (CERC-MEND), Université Laval, Québec, QC, Canada
| | - Roxane Pouliot
- Centre de Recherche en Organogénèse Expérimentale de l'Université Laval/LOEX, Axe médecine régénératrice, Centre de recherche du CHU de Québec-Université Laval, Québec, QC, G1J 1Z4, Canada; Faculté de pharmacie de l'Université Laval, Québec, QC, G1J 1A4, Canada.
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Termer M, Carola C, Salazar A, Keck CM, Hemberger J, von Hagen J. Activity-Guided Characterization of COX-2 Inhibitory Compounds in Waltheria indica L. Extracts. Molecules 2021; 26:molecules26237240. [PMID: 34885813 PMCID: PMC8658768 DOI: 10.3390/molecules26237240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 11/23/2021] [Accepted: 11/26/2021] [Indexed: 11/16/2022] Open
Abstract
Inflammation is the body's response to infection or tissue injury in order to restore and maintain homeostasis. Prostaglandin E2 (PGE-2) derived from arachidonic acid (AA), via up-regulation of cyclooxygenase-2 (COX-2), is a key mediator of inflammation and can also be induced by several other factors including stress, chromosomal aberration, or environmental factors. Targeting prostaglandin production by inhibiting COX-2 is hence relevant for the successful resolution of inflammation. Waltheria indica L. is a traditional medicinal plant whose extracts have demonstrated COX-2 inhibitory properties. However, the compounds responsible for the activity remained unknown. For the preparation of extracts with effective anti-inflammatory properties, characterization of these substances is vital. In this work, we aimed to address this issue by characterizing the substances responsible for the COX-2 inhibitory activity in the extracts and generating prediction models to quantify the COX-2 inhibitory activity without biological testing. For this purpose, an extract was separated into fractions by means of centrifugal partition chromatography (CPC). The inhibitory potential of the fractions and extracts against the COX-2 enzyme was determined using a fluorometric COX-2 inhibition assay. The characterizations of compounds in the fractions with the highest COX-2 inhibitory activity were conducted by high resolution mass spectrometry (HPLC-MS/MS). It was found that these fractions contain alpha-linolenic acid, linoleic acid and oleic acid, identified and reported for the first time in Waltheria indica leaf extracts. After analyzing their contents in different Waltheria indica extracts, it could be demonstrated that these fatty acids are responsible for up to 41% of the COX-2 inhibition observed with Waltheria indica extract. Additional quantification of secondary metabolites in the extract fractions revealed that substances from the group of steroidal saponins and triterpenoid saponins also contribute to the COX-2 inhibitory activity. Based on the content of compounds contributing to COX-2 inhibition, two mathematical models were successfully developed, both of which had a root mean square error (RMSE) = 1.6% COX-2 inhibitory activity, demonstrating a high correspondence between predicted versus observed values. The results of the predictive models further suggested that the compounds contribute to COX-2 inhibition in the order linoleic acid > alpha linolenic acid > steroidal saponins > triterpenoid saponins. The characterization of substances contributing to COX-2 inhibition in this study enables a more targeted development of extraction processes to obtain Waltheria indica extracts with superior anti-inflammatory properties.
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Affiliation(s)
- Michael Termer
- Department of Pharmaceutics and Biopharmaceutics, Philipps-University of Marburg, Robert-Koch-Str. 4, 35032 Marburg, Germany;
- Correspondence:
| | - Christophe Carola
- Merck KGaA, Frankfurterstr. 250, 64293 Darmstadt, Germany; (C.C.); (A.S.); (J.v.H.)
| | - Andrew Salazar
- Merck KGaA, Frankfurterstr. 250, 64293 Darmstadt, Germany; (C.C.); (A.S.); (J.v.H.)
| | - Cornelia M. Keck
- Department of Pharmaceutics and Biopharmaceutics, Philipps-University of Marburg, Robert-Koch-Str. 4, 35032 Marburg, Germany;
| | - Juergen Hemberger
- Department of Life Science Engineering, Institute for Biochemical Engineering & Analytics, University of Applied Sciences, Wiesenstr. 14, 35390 Giessen, Germany;
| | - Joerg von Hagen
- Merck KGaA, Frankfurterstr. 250, 64293 Darmstadt, Germany; (C.C.); (A.S.); (J.v.H.)
- Department of Life Science Engineering, Institute for Biochemical Engineering & Analytics, University of Applied Sciences, Wiesenstr. 14, 35390 Giessen, Germany;
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Tyrrell VJ, Ali F, Boeglin WE, Andrews R, Burston J, Birchall JC, Ingram JR, Murphy RC, Piguet V, Brash AR, O'Donnell VB, Thomas CP. Lipidomic and transcriptional analysis of the linoleoyl-omega-hydroxyceramide biosynthetic pathway in human psoriatic lesions. J Lipid Res 2021; 62:100094. [PMID: 34171322 PMCID: PMC8326207 DOI: 10.1016/j.jlr.2021.100094] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 06/17/2021] [Accepted: 06/18/2021] [Indexed: 12/27/2022] Open
Abstract
A complex assembly of lipids including fatty acids, cholesterol, and ceramides is vital to the integrity of the mammalian epidermal barrier. The formation of this barrier requires oxidation of the substrate fatty acid, linoleic acid (LA), which is initiated by the enzyme 12R-lipoxygenase (LOX). In the epidermis, unoxidized LA is primarily found in long-chain acylceramides termed esterified omega-hydroxy sphingosine (EOS)/phytosphingosine/hydroxysphingosine (collectively EOx). The precise structure and localization of LOX-oxidized EOx in the human epidermis is unknown, as is their regulation in diseases such as psoriasis, one of the most common inflammatory diseases affecting the skin. Here, using precursor LC/MS/MS, we characterized multiple intermediates of EOx, including 9-HODE, 9,10-epoxy-13-HOME, and 9,10,13-TriHOME, in healthy human epidermis likely to be formed via the epidermal LOX pathways. The top layers of the skin contained more LA, 9-HODE, and 9,10,13-TriHOME EOSs, whereas 9,10-epoxy-13-HOME EOS was more prevalent deeper in the stratum corneum. In psoriatic lesions, levels of native EOx and free HODEs and HOMEs were significantly elevated, whereas oxidized species were generally reduced. A transcriptional network analysis of human psoriatic lesions identified significantly elevated expression of the entire biosynthetic/metabolic pathway for oxygenated ceramides, suggesting a regulatory function for EOx lipids in reconstituting epidermal integrity. The role of these new lipids in progression or resolution of psoriasis is currently unknown. We also discovered the central coordinated role of the zinc finger protein transcription factor, ZIC1, in driving the phenotype of this disease. In summary, long-chain oxygenated ceramide metabolism is dysregulated at the lipidomic level in psoriasis, likely driven by the transcriptional differences also observed, and we identified ZIC1 as a potential regulatory target for future therapeutic interventions.
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Affiliation(s)
- Victoria J Tyrrell
- Institute of Infection and Immunity and Systems Immunity Research Institute, School of Medicine, Cardiff University, Nashville, TN, USA
| | - Faraz Ali
- Department of Dermatology and Wound Healing, University Hospital of Wales, Nashville, TN, USA
| | - William E Boeglin
- Department of Pharmacology, Vanderbilt University, Nashville, TN, USA
| | - Robert Andrews
- Institute of Infection and Immunity and Systems Immunity Research Institute, School of Medicine, Cardiff University, Nashville, TN, USA
| | - James Burston
- Institute of Infection and Immunity and Systems Immunity Research Institute, School of Medicine, Cardiff University, Nashville, TN, USA
| | - James C Birchall
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, Aurora, CO, USA
| | - John R Ingram
- Department of Dermatology and Wound Healing, University Hospital of Wales, Nashville, TN, USA
| | - Robert C Murphy
- Department of Pharmacology, University of Colorado Denver, Aurora, CO, USA
| | - Vincent Piguet
- Department of Dermatology and Wound Healing, University Hospital of Wales, Nashville, TN, USA; Division of Dermatology, Department of Medicine, University of Toronto, Toronto, ON, Canada; Division of Dermatology, Department of Medicine, Women's College Hospital, Toronto, ON, Canada
| | - Alan R Brash
- Department of Pharmacology, Vanderbilt University, Nashville, TN, USA
| | - Valerie B O'Donnell
- Institute of Infection and Immunity and Systems Immunity Research Institute, School of Medicine, Cardiff University, Nashville, TN, USA
| | - Christopher P Thomas
- Institute of Infection and Immunity and Systems Immunity Research Institute, School of Medicine, Cardiff University, Nashville, TN, USA; School of Pharmacy and Pharmaceutical Sciences, Cardiff University, Aurora, CO, USA.
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Termer M, Carola C, Salazar A, Keck CM, Hemberger J, von Hagen J. Identification of plant metabolite classes from Waltheria Indica L. extracts regulating inflammatory immune responses via COX-2 inhibition. JOURNAL OF ETHNOPHARMACOLOGY 2021; 270:113741. [PMID: 33359867 DOI: 10.1016/j.jep.2020.113741] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 12/11/2020] [Accepted: 12/19/2020] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Waltheria Indica L. is traditionally used in Africa, South America and Hawaii to treat pain, anemia, diarrhea, epilepsy and inflammatory related diseases. AIM OF THE STUDY This study aimed to identify extraction parameters to maximize tiliroside yield and to quantitative secondary metabolite composition of Waltheria Indica under various extraction conditions. The extracts were tested for COX-2 inhibition and their activity correlated with the type and quantity of the secondary metabolites. Insight was gained about how extraction parameters influence the extract composition and thus the COX-2 enzymatic inhibitory activity. MATERIALS AND METHODS Powdered leaves of Waltheria Indica were extracted using water, methanol, ethyl acetate and ethanol at different temperatures. Tiliroside was identified by HPLC-HRMS n and quantified using a tiliroside standard. The compound groups of the secondary metabolites were quantified by spectrometric methods. Inhibitory potential of different Waltheria extracts against the COX-2 enzyme was determined using a fluorometric COX-2 inhibition assay. RESULTS The molecule, tiliroside, exhibited a COX-2 inhibition of 10.4% starting at a concentration of 15 μM and increased in a dose dependent manner up to 51.2% at 150 μM. The ethanolic extract at 30 °C and the ethyl acetate extract at 90 °C inhibited COX-2 with 37.7% and 38.9%, while the methanolic and aqueous extract showed a lower inhibition of 21.9% and 9.2% respectively. The results concerning phenol, alkaloid and tiliroside concentration in the extracts showed no dependence on COX-2 inhibition. The extracts demonstrated a direct correlation of COX-2 inhibitory activity with their triterpenoid-/steroidal-saponin concentration. COX-2 inhibition increased linearly with the concentration of the saponins. CONCLUSION The data suggest that Waltheria Indica extracts inhibit the key inflammatory enzyme, COX-2, as a function of triterpenoid- and steroidal-saponin concentration and support the known efficacy of extracted Waltheria Indica leaves as a traditional treatment against inflammation related diseases.
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Affiliation(s)
- Michael Termer
- Department of Pharmaceutics and Biopharmaceutics, Philipps-University of Marburg, Marburg, Germany.
| | | | - Andrew Salazar
- Merck KGaA, BU Performance Materials, Darmstadt, Germany
| | - Cornelia M Keck
- Department of Pharmaceutics and Biopharmaceutics, Philipps-University of Marburg, Marburg, Germany
| | - Juergen Hemberger
- Department of Life Science Engineering, Institute for Biochemical Engineering & Analytics, University of Applied Sciences, Giessen, Germany
| | - Joerg von Hagen
- Department of Life Science Engineering, Institute for Biochemical Engineering & Analytics, University of Applied Sciences, Giessen, Germany; Merck KGaA, BU Performance Materials, Darmstadt, Germany
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Expression of Cyclooxygenase-2 in Human Epithelial Skin Lesions: A Systematic Review of Immunohistochemical Studies. Appl Immunohistochem Mol Morphol 2020; 29:163-174. [PMID: 32889812 DOI: 10.1097/pai.0000000000000871] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 07/27/2020] [Indexed: 01/17/2023]
Abstract
Permanent, elevated expression of cyclooxygenase-2 (COX-2) in keratinocytes of epidermis can stimulate its hyperplasia and constitute a factor promoting cancer development, as demonstrated in animal models. Intratumoral level and localization of COX-2 in epithelial lesions of human skin was examined immunohistochemically in 26 studies. In squamous cell carcinomas (SCCs), strong staining was observed with great compatibility. High COX-2 detectability throughout the entire tumor mass could be helpful in the finding of SCC cells. However, in basal cell carcinomas, and precancerous lesions, frequency and detection level of this protein, as well as the type and/or localization of stained cells within the tumor, varied among different research groups. The discrepancies may be due to the heterogeneity of each of these 2 groups of lesions. However, differences in COX-2 staining in normal skin indicate also possible methodological reasons. In general, COX-2 levels were significantly decreased in basal cell carcinomas compared with SCCs, which could be used in the differential diagnosis of these cancers. Reduced, although heterogenous, COX-2 expression in precancerous lesions may suggest its association with SCC development. These observations are consistent with data on the efficacy of preventive and therapeutic effects of nonsteroidal anti-inflammatory drugs that are COX-2 inhibitors.
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Kuźbicki Ł, Brożyna AA. Immunohistochemical detectability of cyclooxygenase-2 expression in cells of human melanocytic skin lesions: A methodological review. J Cutan Pathol 2020; 47:363-380. [PMID: 31675116 DOI: 10.1111/cup.13606] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 10/16/2019] [Accepted: 10/26/2019] [Indexed: 12/22/2022]
Abstract
Increased cyclooxygenase-2 (COX-2) expression is thought to support tumorigenesis through various mechanisms and is analyzed as a potential cancer marker. In 18 studies, COX-2 expression in melanocytic lesions of human skin was examined immunohistochemically. However, results obtained by individual research groups differ in terms of detection frequency and level of this protein, as well as localization of stained cells within tumor. Possible reasons for the discrepancies are analyzed in this review: the application of different antibodies, the use of standard histopathological sections or tissue microarrays and the analyzes of staining results based on different algorithms. COX-2 level is significantly lower in nevi than in melanomas, increases gradually with progression of these malignant cancers and reaches the highest values in metastases. These gradual changes in COX-2 expression appear to be difficult to analyze based only on subjective assessment of staining intensity. The most convergent data were obtained using antibodies for N-terminal fragments of COX-2 protein and analyzing results based on calculation of percentage fraction of positive cells. The extent of stained area in specimen thus appears to be more important than the intensity of staining in terms of evaluation of COX-2 performance as a diagnostic and prognostic marker of cutaneous melanoma.
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Affiliation(s)
- Łukasz Kuźbicki
- Department of Human Biology, Institute of Biology, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University in Toruń, Toruń, Poland
| | - Anna A Brożyna
- Department of Human Biology, Institute of Biology, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University in Toruń, Toruń, Poland
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Jie H, Xu ZX, Su Y, Lei MY, Zeng DJ, Zhao GJ, Feng XL, Zheng CL, Zhang CL, Liang ZJ, Li DY. The transcriptome analysis of males musk gland in Moschus berezovskii (Artiodactyla: Moschidae). EUROPEAN ZOOLOGICAL JOURNAL 2019. [DOI: 10.1080/24750263.2019.1681525] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- H. Jie
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Yucheng, China
- Chongqing Engineering Technology Research Center for GAP of Genuine Medicinal Materials, Chongqing Institute of Medicinal Plant Cultivation, Chongqing, China
| | - Z. X. Xu
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Yucheng, China
| | - Y. Su
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Yucheng, China
| | - M. Y. Lei
- Chongqing Engineering Technology Research Center for GAP of Genuine Medicinal Materials, Chongqing Institute of Medicinal Plant Cultivation, Chongqing, China
| | - D. J. Zeng
- Chongqing Engineering Technology Research Center for GAP of Genuine Medicinal Materials, Chongqing Institute of Medicinal Plant Cultivation, Chongqing, China
| | - G. J. Zhao
- Chongqing Engineering Technology Research Center for GAP of Genuine Medicinal Materials, Chongqing Institute of Medicinal Plant Cultivation, Chongqing, China
| | - X. L. Feng
- Chongqing Engineering Technology Research Center for GAP of Genuine Medicinal Materials, Chongqing Institute of Medicinal Plant Cultivation, Chongqing, China
| | - C. L. Zheng
- Sichuan Institute of Musk Deer Breeding, Chengdu, China
| | - C. L. Zhang
- Chongqing Engineering Technology Research Center for GAP of Genuine Medicinal Materials, Chongqing Institute of Medicinal Plant Cultivation, Chongqing, China
| | - Z. J. Liang
- Chongqing Engineering Technology Research Center for GAP of Genuine Medicinal Materials, Chongqing Institute of Medicinal Plant Cultivation, Chongqing, China
| | - D. Y. Li
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Yucheng, China
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Kazem S, Linssen EC, Gibbs S. Skin metabolism phase I and phase II enzymes in native and reconstructed human skin: a short review. Drug Discov Today 2019; 24:1899-1910. [PMID: 31176740 DOI: 10.1016/j.drudis.2019.06.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 05/01/2019] [Accepted: 06/03/2019] [Indexed: 01/01/2023]
Abstract
Understanding skin metabolism is important when considering drug discovery and safety assessment. This review compares xenobiotic skin metabolism in ex vivo skin to reconstructed human skin and reconstructed human epidermis models, concentrating on phase I and phase II enzymes. Reports on phase I enzymes are more abundant than for phase II enzymes with mRNA and protein expression far more reported than enzyme activity. Almost all of the xenobiotic metabolizing enzymes detected in human skin are also present in liver. However, in general the relative levels are lower in skin than in liver and fewer enzymes are reported.
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Affiliation(s)
- Siamaque Kazem
- Department of Molecular Cell Biology and Immunology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Emma Charlotte Linssen
- Department of Molecular Cell Biology and Immunology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Susan Gibbs
- Department of Molecular Cell Biology and Immunology, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands; Department of Oral Cell Biology, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
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11
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Mikami D, Sakai S, Yuyama K, Igarashi Y. Isolation of Sphingoid Bases from Starfish Asterias amurensis Glucosylceramides and Their Effects on Sphingolipid Production in Cultured Keratinocytes. J Oleo Sci 2019; 68:427-441. [PMID: 30971644 DOI: 10.5650/jos.ess18256] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Starfish Asterias amurensis produces sphingoid bases d18:3, 9-methyl-d18:3 (9Me-d18:3), and d22:2, which possess unique structural features. In this study, sphingoid bases prepared from A. amurensis glucosylceramides displayed unexpected elution behaviors from a general octadecyl silyl high-performance liquid chromatography (HPLC) column. For separation and isolation, sphingoid bases were fractionated by octadecyl silyl HPLC after N-acetylation, yielding d18:3, 9Me-d18:3, and two d22:2 isomers. To compare the biological activities of individual sphingoid bases, their effects on sphingolipid production in normal human keratinocytes were evaluated. Treatment with sphingoid bases increased the content of ceramides, glucosylceramides, and sphingomyelins in keratinocytes. Moreover, ceramides, which contain saturated ultra-long-chain fatty acids (C30-34), were significantly increased by treatment with d18:3, but not with other A. amurensis sphingoid bases. The mRNA level of the early differentiation marker keratin 10 was markedly decreased and sphingolipid synthesis-related genes were slightly increased in keratinocytes exposed to A. amurensis-derived d18:3, 9Me-d18:3, and d22:2 isomers. These results suggest that A. amurensis-derived sphingoid bases induce differentiation to varying degrees, sphingolipid production depends on their chemical structures, and d18:3 is the most promising functional sphingoid base.
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Affiliation(s)
- Daisuke Mikami
- Laboratory of Biomembrane and Biofunctional Chemistry, Frontier Research Center for Advanced Material and Life science, Hokkaido University
| | - Shota Sakai
- Laboratory of Biomembrane and Biofunctional Chemistry, Frontier Research Center for Advanced Material and Life science, Hokkaido University.,Department of Biochemistry & Cell Biology, National Institute of Infectious Diseases
| | - Kohei Yuyama
- Laboratory of Biomembrane and Biofunctional Chemistry, Frontier Research Center for Advanced Material and Life science, Hokkaido University
| | - Yasuyuki Igarashi
- Laboratory of Biomembrane and Biofunctional Chemistry, Frontier Research Center for Advanced Material and Life science, Hokkaido University
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12
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Oesch F, Fabian E, Landsiedel R. Xenobiotica-metabolizing enzymes in the skin of rat, mouse, pig, guinea pig, man, and in human skin models. Arch Toxicol 2018; 92:2411-2456. [PMID: 29916051 PMCID: PMC6063329 DOI: 10.1007/s00204-018-2232-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 05/29/2018] [Indexed: 12/26/2022]
Abstract
Studies on the metabolic fate of medical drugs, skin care products, cosmetics and other chemicals intentionally or accidently applied to the human skin have become increasingly important in order to ascertain pharmacological effectiveness and to avoid toxicities. The use of freshly excised human skin for experimental investigations meets with ethical and practical limitations. Hence information on xenobiotic-metabolizing enzymes (XME) in the experimental systems available for pertinent studies compared with native human skin has become crucial. This review collects available information of which—taken with great caution because of the still very limited data—the most salient points are: in the skin of all animal species and skin-derived in vitro systems considered in this review cytochrome P450 (CYP)-dependent monooxygenase activities (largely responsible for initiating xenobiotica metabolism in the organ which provides most of the xenobiotica metabolism of the mammalian organism, the liver) are very low to undetectable. Quite likely other oxidative enzymes [e.g. flavin monooxygenase, COX (cooxidation by prostaglandin synthase)] will turn out to be much more important for the oxidative xenobiotic metabolism in the skin. Moreover, conjugating enzyme activities such as glutathione transferases and glucuronosyltransferases are much higher than the oxidative CYP activities. Since these conjugating enzymes are predominantly detoxifying, the skin appears to be predominantly protected against CYP-generated reactive metabolites. The following recommendations for the use of experimental animal species or human skin in vitro models may tentatively be derived from the information available to date: for dermal absorption and for skin irritation esterase activity is of special importance which in pig skin, some human cell lines and reconstructed skin models appears reasonably close to native human skin. With respect to genotoxicity and sensitization reactive-metabolite-reducing XME in primary human keratinocytes and several reconstructed human skin models appear reasonably close to human skin. For a more detailed delineation and discussion of the severe limitations see the Conclusions section in the end of this review.
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Affiliation(s)
- F Oesch
- Institute of Toxicology, Johannes Gutenberg-University, Obere Zahlbacherstr. 67, 55131, Mainz, Germany
| | - E Fabian
- Experimental Toxicology and Ecology, GV/TB, Z470, BASF SE, Carl-Bosch-Str. 38, 67056, Ludwigshafen, Germany
| | - Robert Landsiedel
- Experimental Toxicology and Ecology, GV/TB, Z470, BASF SE, Carl-Bosch-Str. 38, 67056, Ludwigshafen, Germany.
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13
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Bakry OA, El Farargy SM, El Kady NNED, Dawy HFA. Immunohistochemical Expression of Cyclo-oxygenase 2 and Liver X Receptor-α in Acne Vulgaris. J Clin Diagn Res 2017; 11:WC01-WC07. [PMID: 29207817 DOI: 10.7860/jcdr/2017/28754.10577] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 07/20/2017] [Indexed: 11/24/2022]
Abstract
Introduction Acne Vulgaris (AV) is a common inflammatory disease of pilosebaceous units. Liver X Receptor-α (LXR-α) is a ligand activated transcription factor. It controls transcription of genes involved in lipid and fatty acid synthesis. Cyclo-oxygenase 2 (COX2) is a rate limiting enzyme in prostaglandin synthesis. It plays important role in inflammation. Aim To evaluate the immunohistochemical expression of LXR-α and COX2 in acne vulgaris skin biopsies to explore their possible pathogenic role in this disease. Materials and Methods Sixty five subjects were included (45 cases with AV and 20 age and gender-matched healthy controls). Skin biopsies were taken from lesional and perilesional skin of cases and from site-matched areas of control subjects. The evaluation of LXR-α and COX2 was done using immunohistochemical technique. Data were collected, tabulated and statistically analysed using a personal computer with "(SPSS) version 11" program. Chi-square test was used to study the association between qualitative variables. Mann-Whitney test was used for comparison between quantitative variables. Student's t-test was used for comparison between two groups having quantitative variables. Spearman's coefficient was used to study the correlation between two different variables. Differences were considered statistically significant with p<0.05. Results COX2 was upregulated in lesional skin compared with peilesional and control skin both in epidermis and pilosebaceous units (p<0.001 for all). Higher epidermal COX2% was significantly associated with papulopustular acne (p=0.009) and higher acne score (p=0.018). Higher pilosebaceous units COX2% was significantly associated with papulopustular acne (p=0.04). LXR-α was upregulated in lesional skin compared with peilesional and control skin both in epidermis and pilosebaceous units (p<0.001 for all). Higher LXR-α % in epidermis and pilosebaceous units was significantly associated with papulopustular acne (p=0.01 for both) and higher acne score (p=0.03 for both). Significant positive correlation was detected between COX2% and LXR-α % in epidermis (p=0.001, r=0.87) and pilosebaceous units (p=0.001, r=0.65). Conclusion Both LXR-α and COX-2 play a role in the pathogenesis of acne vulgaris through their effects on cellular proliferation, inflammation and lipid synthesis. Research for new therapeutic modalities based on their inhibition is needed. More understanding of the interaction between LXR-α, COX2 and acne lesions may lead to effective interference, possibly directed toward specific cell types or steps within inflammatory pathways.
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Affiliation(s)
- Ola Ahmed Bakry
- Assistant Professor, Department of Dermatology, Andrology and STDs, Faculty of Medicine, Menoufiya University, Shibeen El Koom, Egypt
| | - Shawky Mahmoud El Farargy
- Professor, Department of Dermatology, Andrology and STDs, Faculty of Medicine, Menoufiya University, Shibeen El Koom, Egypt
| | - Noha Nour El Din El Kady
- Lecturer, Department of Pathology, Faculty of Medicine, Menoufiya University, Shibeen El Koom, Egypt
| | - Hend Farag Abu Dawy
- Dermatology Specialist, Faculty of Medicine, Menoufiya University, Shibeen El Koom, Egypt
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Smith KJ, Skelton H. Arachidonic Acid-Derived Bioactive Lipids: Their Role and the Role for Their Inhibitors in Dermatology. J Cutan Med Surg 2016. [DOI: 10.1177/120347540200600309] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background: In addition to corticosteroids, there are increasing numbers of anti-inflammatory agents that specifically target bioactive lipids generated from arachidonic acid. Knowledge of the diverse mechanisms of action of these different bioactive lipids holds promise in the therapy of a wide spectrum of cutaneous and systemic disorders. Objective: Therapeutic manipulations of these lipid molecules through inhibition, stimulation, or direct replacement have broad physiologic effects. These therapeutic strategies not only modulate inflammation, pain, and hemostatic parameters, they also play a role in cardiac, respiratory, renal, and gastrointestinal function and disease, as well as in angiogenesis and in factors that control cell growth and apoptosis important in carcinogenesis. Conclusion: Newer drug discovery methods, including combinatorial chemistry with molecular modeling, have made it possible to develop inhibitors and analogs with increasing specificity and bioactivity and decreasing toxicity. Although the application of these analogs and inhibitors for cutaneous disease is limited today, either as primary agents or adjuvant therapy, these drugs will have a place in our therapeutic regimes of the future. We present a review of the therapeutic agents now available from manipulation of these bioactive lipids, and their role and future in dermatology.
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Affiliation(s)
- Kathleen J. Smith
- The opinions and assertions contained herein are the private views of the authors and are not to be construed as official or as reflecting the views of the Department of the Army, the Department of the Navy, or the Department of Defense
| | - Henry Skelton
- The opinions and assertions contained herein are the private views of the authors and are not to be construed as official or as reflecting the views of the Department of the Army, the Department of the Navy, or the Department of Defense
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15
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de Souza do Nascimento J, Carlos R, Delgado-Azañero W, Mosqueda Taylor A, de Almeida OP, Romañach MJ, de Andrade BAB. Immunohistochemical expression of cyclooxygenase-2 (COX-2) in oral nevi and melanoma. J Oral Pathol Med 2016; 45:440-3. [PMID: 26608958 DOI: 10.1111/jop.12385] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/19/2015] [Indexed: 11/30/2022]
Abstract
BACKGROUND Cyclooxygenase-2 (COX-2) catalyses the conversion of arachidonic acid to prostaglandin, and its overexpression has been demonstrated in different malignant tumors, including cutaneous melanoma. However, no data about the expression of this protein in oral melanocytic lesions are available to date. The aim of this study was to evaluate the immunohistochemical expression of COX-2 in oral nevi and melanomas, comparing the results with correspondent cutaneous lesions. METHODS COX-2 was evaluated by immunohistochemistry in 49 oral melanocytic lesions, including 36 intramucosal nevi and 13 primary oral melanomas, and in four cutaneous nevi and eight melanomas. RESULTS All cases of oral and cutaneous melanomas were positive for COX-2. On the other hand, all oral and cutaneous melanocytic nevi were negative. CONCLUSION COX-2 is highly positive in oral melanomas and negative in oral nevi and might represent a useful marker to distinguish melanocytic lesions of the oral cavity.
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Affiliation(s)
| | - Román Carlos
- Pathology Section, Centro Clínico de Cabeza y Cuello/Hospital Herrera Llerandi, Guatemala City, Guatemala
| | | | | | - Oslei Paes de Almeida
- Oral Pathology, School of Dentistry, State University of Campinas, Piracicaba, São Paulo, Brazil
| | - Mário José Romañach
- Oral Pathology, Department of Oral Diagnosis and Pathology, School of Dentistry, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Bruno Augusto Benevenuto de Andrade
- Oral Pathology, Department of Oral Diagnosis and Pathology, School of Dentistry, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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16
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Chankong T, Chotjumlong P, Sastraruji T, Pongsiriwet S, Iamaroon A, Krisanaprakornkit S. Increased cyclooxygenase 2 expression in association with oral lichen planus severity. J Dent Sci 2016; 11:238-244. [PMID: 30894979 PMCID: PMC6395257 DOI: 10.1016/j.jds.2015.12.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 12/14/2015] [Indexed: 12/25/2022] Open
Abstract
Background/purpose Although some studies have shown induction of cyclooxygenase 2 (COX-2) in oral lichen planus (OLP), an association between COX-2 upregulation and OLP clinical severity has not been investigated. Therefore, we aimed to compare COX-2 expression in OLP with that in normal oral tissues, and to determine correlations between COX-2 expression and both clinical criteria and visual analog scale (VAS) scores. Materials and methods COX-2 expression was studied in 25 OLP and 13 normal oral tissues by immunohistochemistry. Both clinical criteria and VAS scores were used to evaluate the clinical severity of OLP. The differences in COX-2 expression between OLP and normal tissues, and the correlations between COX-2 expression and clinical severity were determined by the nonparametric statistical tests. Results COX-2 expression was significantly increased in OLP epithelium when compared with normal epithelium (P < 0.001), and intense COX-2 staining in inflammatory infiltrates was observed in the OLP lamina propria. COX-2 expression in OLP epithelium and inflammatory infiltrates was significantly correlated with the clinical criteria score (r = 0.428, P = 0.007, and r = 0.681, P < 0.001, respectively), whereas a significant correlation with the VAS score was observed only in OLP inflammatory infiltrates (r = 0.605, P < 0.001). Conclusion Enhanced COX-2 expression in both OLP epithelium and inflammatory infiltrates correlates well with the clinical severity. An association between VAS score and COX-2 expression in OLP inflammatory infiltrates suggests an important role of additional COX-2 expression from inflammation in causing pain in OLP patients.
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Affiliation(s)
- Thaneeya Chankong
- Center of Excellence in Oral and Maxillofacial Biology, Department of Oral Biology and Diagnostic Sciences, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand
| | - Pareena Chotjumlong
- Center of Excellence in Oral and Maxillofacial Biology, Department of Oral Biology and Diagnostic Sciences, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand
| | - Thanapat Sastraruji
- Center of Excellence in Oral and Maxillofacial Biology, Department of Oral Biology and Diagnostic Sciences, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand
| | - Surawut Pongsiriwet
- Center of Excellence in Oral and Maxillofacial Biology, Department of Oral Biology and Diagnostic Sciences, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand
| | - Anak Iamaroon
- Center of Excellence in Oral and Maxillofacial Biology, Department of Oral Biology and Diagnostic Sciences, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand
| | - Suttichai Krisanaprakornkit
- Center of Excellence in Oral and Maxillofacial Biology, Department of Oral Biology and Diagnostic Sciences, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand
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17
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Grandits M, Oostenbrink C. Selectivity of cytosolic phospholipase A2 type IV toward arachidonyl phospholipids. J Mol Recognit 2015; 28:447-57. [PMID: 25703463 DOI: 10.1002/jmr.2462] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 01/07/2015] [Accepted: 01/07/2015] [Indexed: 11/06/2022]
Abstract
Cytosolic phospholipase A2 (cPLA2 ) is an interesting protein involved in inflammatory processes and various diseases. Its catalytic mechanism as well as its substrate specificity for arachidonyl phospholipids is not typical for other phospolipases. Furthermore, a lid structure, which ensures a hydrophilic surface of the protein without any substrate bound and the movement of this flexible loop to make the hydrophobic active site accessible, is of high interest. Therefore, the focus of this work was to determine the binding mode of cPLA2 with various substrates, such as arachidonic acid, a synthetic inhibitor, a saturated phospholipid, and most importantly an arachidonyl phospholipid. To understand the selectivity of the protein toward the arachidonyl phospholipid and the interaction in a protein-ligand complex, molecular dynamics simulations were performed using the GROMOS suite of simulation programs. The simulations provide insight into the protein and showed that selective binding of arachidonyl phospholipids is because of the shape of the sn-2 tail. The amino acids Asn555 and Ala578 are involved in the strongest interactions observed in the protein-ligand complexes.
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Affiliation(s)
- Melanie Grandits
- Department of Material Sciences and Process Engineering, Institute of Molecular Modeling and Simulation, University of Natural Resources and Life Sciences Vienna, Muthgasse 18, 1190, Vienna, Austria
| | - Chris Oostenbrink
- Department of Material Sciences and Process Engineering, Institute of Molecular Modeling and Simulation, University of Natural Resources and Life Sciences Vienna, Muthgasse 18, 1190, Vienna, Austria
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18
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Genetic and pharmacological analysis identifies a physiological role for the AHR in epidermal differentiation. J Invest Dermatol 2015; 135:1320-1328. [PMID: 25602157 PMCID: PMC4402116 DOI: 10.1038/jid.2015.6] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 12/10/2014] [Accepted: 12/23/2014] [Indexed: 12/22/2022]
Abstract
Stimulation of the aryl hydrocarbon receptor (AHR) by xenobiotics is known to affect epidermal differentiation and skin barrier formation. The physiological role of endogenous AHR signaling in keratinocyte differentiation is not known. We used murine and human skin models to address the hypothesis that AHR activation is required for normal keratinocyte differentiation. Using transcriptome analysis of Ahr(-/-) and Ahr(+/+) murine keratinocytes, we found significant enrichment of differentially expressed genes linked to epidermal differentiation. Primary Ahr(-/-) keratinocytes showed a significant reduction in terminal differentiation gene and protein expression, similar to Ahr(+/+) keratinocytes treated with AHR antagonists GNF351 and CH223191, or the selective AHR modulator (SAhRM) SGA360. In vitro keratinocyte differentiation led to increased AHR levels and subsequent nuclear translocation, followed by induced CYP1A1 gene expression. Monolayer cultured primary human keratinocytes treated with AHR antagonists also showed an impaired terminal differentiation program. Inactivation of AHR activity during human skin equivalent development severely impaired epidermal stratification, terminal differentiation protein expression, and stratum corneum formation. As disturbed epidermal differentiation is a main feature of many skin diseases, pharmacological agents targeting AHR signaling or future identification of endogenous keratinocyte-derived AHR ligands should be considered as potential new drugs in dermatology.
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19
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Hua HK, Jin C, Yang LJ, Tao SQ, Zhu XH. Expression of Cyclooxygenase-2 in Squamous Cell Carcinoma and Keratoacanthoma and its Clinical Significance. Cell Biochem Biophys 2015; 72:475-80. [DOI: 10.1007/s12013-014-0490-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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20
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Oesch F, Fabian E, Guth K, Landsiedel R. Xenobiotic-metabolizing enzymes in the skin of rat, mouse, pig, guinea pig, man, and in human skin models. Arch Toxicol 2014; 88:2135-90. [PMID: 25370008 PMCID: PMC4247477 DOI: 10.1007/s00204-014-1382-8] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Accepted: 10/02/2014] [Indexed: 02/01/2023]
Abstract
The exposure of the skin to medical drugs, skin care products, cosmetics, and other chemicals renders information on xenobiotic-metabolizing enzymes (XME) in the skin highly interesting. Since the use of freshly excised human skin for experimental investigations meets with ethical and practical limitations, information on XME in models comes in the focus including non-human mammalian species and in vitro skin models. This review attempts to summarize the information available in the open scientific literature on XME in the skin of human, rat, mouse, guinea pig, and pig as well as human primary skin cells, human cell lines, and reconstructed human skin models. The most salient outcome is that much more research on cutaneous XME is needed for solid metabolism-dependent efficacy and safety predictions, and the cutaneous metabolism comparisons have to be viewed with caution. Keeping this fully in mind at least with respect to some cutaneous XME, some models may tentatively be considered to approximate reasonable closeness to human skin. For dermal absorption and for skin irritation among many contributing XME, esterase activity is of special importance, which in pig skin, some human cell lines, and reconstructed skin models appears reasonably close to human skin. With respect to genotoxicity and sensitization, activating XME are not yet judgeable, but reactive metabolite-reducing XME in primary human keratinocytes and several reconstructed human skin models appear reasonably close to human skin. For a more detailed delineation and discussion of the severe limitations see the “Overview and Conclusions” section in the end of this review.
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Affiliation(s)
- F Oesch
- Oesch-Tox Toxicological Consulting and Expert Opinions GmbH&Co.KG, Rheinblick 21, 55263, Wackernheim, Germany
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21
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Bakry OA, Samaka RM, Shoeib MAM, Abdel Aal SM. Nuclear Factor Kappa B and Cyclo-Oxygenase-2: Two Concordant Players in Psoriasis Pathogenesis. Ultrastruct Pathol 2014; 39:49-61. [DOI: 10.3109/01913123.2014.952470] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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22
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Takeda K, Kanekura T, Kanzaki T. Negative Feedback Regulation of Phosphatidylinositol 3-Kinase/Akt Pathway by Over-Expressed Cyclooxygenase-2 in Human Epidermal Cancer Cells. J Dermatol 2014; 31:516-23. [PMID: 15492414 DOI: 10.1111/j.1346-8138.2004.tb00547.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2004] [Accepted: 02/24/2004] [Indexed: 11/28/2022]
Abstract
While enhanced expression of cyclooxygenase (COX)-2 has been observed in human skin epidermal cancer, the mechanisms underlying COX-2 expression have not been completely elucidated. Recently, a role for the phosphatidylinositol-3 (PI3) kinase pathway in COX-2 expression has attracted attention. We investigated COX-2 expression, PI3 kinase activity, and the phosphorylation level of Akt, a downstream effector of PI3 kinase, in the human skin cancer cell line HSC-5. Compared to the nontumorigenic keratinocyte HaCaT, in HSC-5 cells, COX-2 protein expression and PI3 kinase activity were increased. The PI3 kinase inhibitor LY294002 reduced COX-2 expression in HSC-5 cells and, contrary to our expectation, the phosphorylation of Akt was significantly decreased. The expression of Bcl-2, which is regulated by Akt, was reduced, and apoptosis was induced in HSC-5 cells compared to HaCaT cells. COX-2 inhibitor NS398 up-regulated Akt phosphorylation. These results imply that constitutively over-expressed COX-2 down-regulates the Akt phosphorylation through a negative feedback mechanism.
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Affiliation(s)
- Koichiro Takeda
- Department of Dermatology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
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Abstract
Aquagenic syringeal acrokeratoderma is a newly described condition of the palms and soles characterized by hypopigmented papules and plaques, elicited after submersion in water. Symptoms include a burning pain and a tightening sensation in the palms, as well as hyperhidrosis. Initially thought to be rare, its frequent citation in the literature points to a more common entity. It is more often found in young women and has been linked to a number of medications and illnesses, including nonsteroidal anti-inflammatory drugs and cystic fibrosis. It is typically self-limiting, but certain medications such as topical aluminum chloride or salicylic acid ointment have been found to be an effective treatment option. This case details a collegiate-level coxswain who presented to the university athletic training room with a typical presentation of aquagenic syringeal acrokeratoderma. For an aquatic athlete, aquagenic syringeal acrokeratoderma can be a distressing condition that can limit training and athletic participation. As such, the sports medicine physician should be knowledgeable about aquagenic syringeal acrokeratoderma to provide effective counseling and treatment options for the athlete.
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Affiliation(s)
- Jeremy B Kent
- Department of Family Medicine, University of Virginia Health System, Charlottesville, Virginia
| | - Siobhan M Statuta
- Department of Family Medicine, University of Virginia Health System, Charlottesville, Virginia ; Physical Medicine & Rehabilitation, University of Virginia Health System, Charlottesville, Virginia
| | - Kenneth E Greer
- Department of Dermatology, University of Virginia Health System, Charlottesville, Virginia
| | - John M MacKnight
- Internal Medicine and Orthopaedic Surgery, University of Virginia Health System, Charlottesville, Virginia
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Schmitt J, Miot H. Oral acetylsalicylic acid and prevalence of actinic keratosis. Rev Assoc Med Bras (1992) 2014; 60:131-8. [DOI: 10.1590/1806-9282.60.02.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 08/30/2013] [Indexed: 11/21/2022] Open
Abstract
Objective: To investigate the influence of a regular oral use of acetylsalicylic acid in the prevalence of actinic keratosis. Methods: A case-control study with dermatologic outpatients above 50 years of age assessed between 2009 and 2011. Cases were defined as those who had been under regular use of oral acetylsalicylic acid for more than six consecutive months. The assessment focused on: age, sex, skin-type, tobacco smoking, use of medication, occurrence of individual or family skin cancer, and sunscreen and sun exposure habits. Actinic keratoses were counted in the medial region of the face and upper limbs. Counts were adjusted by co-variables based on a generalized linear model. Results: A total of 74 cases and 216 controls were assessed. The median time of acetylsalicylic acid use was 36 months. Cases differed from controls as to the highest age, highest prevalence of use of angiotensin-converting enzyme inhibitors and fewer keratosis on the face and on the upper limbs (p<0.05). The multivariate model showed that the use of acetylsalicylic acid was associated to lower counts of face actinic keratosis and upper-limb erythematous actinic keratosis (p<0.05), regardless of other risk factors. Conclusion: The regular use of oral acetylsalicylic acid for more than six months was associated to a lower prevalence of actinic keratosis, especially facial and erythematous ones.
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25
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Habib MA, Salem SAM, Hakim SA, Shalan YAM. Comparative immunohistochemical assessment of cutaneous cyclooxygenase-2 enzyme expression in chronological aging and photoaging. PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE 2013; 30:43-51. [DOI: 10.1111/phpp.12087] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/01/2013] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Sarah Adel Hakim
- Department of Pathology; Faculty of Medicine; Ain Shams University; Cairo Egypt
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Baquerizo K, Amini S, Keri JE, Badiavas EV, Elgart GW. Atypical form of transient reactive papulotranslucent acrokeratoderma in a cystic fibrosis carrier. J Cutan Pathol 2013; 40:413-8. [DOI: 10.1111/cup.12087] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Revised: 10/09/2012] [Accepted: 11/18/2012] [Indexed: 11/30/2022]
Affiliation(s)
- Katherine Baquerizo
- Department of Dermatology and Cutaneous Surgery; University of Miami Miller School of Medicine; Miami; FL; USA
| | - Sadegh Amini
- Department of Dermatology and Cutaneous Surgery; University of Miami Miller School of Medicine; Miami; FL; USA
| | - Jonette E. Keri
- Department of Dermatology and Cutaneous Surgery; University of Miami Miller School of Medicine; Miami; FL; USA
| | - Evangelos V. Badiavas
- Department of Dermatology and Cutaneous Surgery; University of Miami Miller School of Medicine; Miami; FL; USA
| | - George W. Elgart
- Department of Dermatology and Cutaneous Surgery; University of Miami Miller School of Medicine; Miami; FL; USA
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Nicolaou A. Eicosanoids in skin inflammation. Prostaglandins Leukot Essent Fatty Acids 2013; 88:131-8. [PMID: 22521864 DOI: 10.1016/j.plefa.2012.03.009] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2012] [Revised: 03/29/2012] [Accepted: 03/30/2012] [Indexed: 12/27/2022]
Abstract
Eicosanoids play an integral part in homeostatic mechanisms related to skin health and structural integrity. They also mediate inflammatory events developed in response to environmental factors, such as exposure to ultraviolet radiation, and inflammatory and allergic disorders, including psoriasis and atopic dermatitis. This review article discusses biochemical aspects related to cutaneous eicosanoid metabolism, the contribution of these potent autacoids to skin inflammation and related conditions, and considers the importance of nutritional supplementation with bioactives such as omega-3 and omega-6 polyunsaturated fatty acids and plant-derived antioxidants as means of addressing skin health issues.
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Affiliation(s)
- Anna Nicolaou
- School of Pharmacy and Centre for Skin Sciences, School of Life Sciences, University of Bradford, Richmond Road, Bradford BD7 1DP, UK.
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28
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Hanson J, Gille A, Offermanns S. Role of HCA2 (GPR109A) in nicotinic acid and fumaric acid ester-induced effects on the skin. Pharmacol Ther 2012; 136:1-7. [DOI: 10.1016/j.pharmthera.2012.06.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Accepted: 06/08/2012] [Indexed: 11/16/2022]
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Cyclooxygenase-dependent signaling is causally linked to non-melanoma skin carcinogenesis: pharmacological, genetic, and clinical evidence. Cancer Metastasis Rev 2011; 30:343-61. [DOI: 10.1007/s10555-011-9306-z] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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30
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Lau WM, Ng KW, White AW, Heard CM. Therapeutic and Cytotoxic Effects of the Novel Antipsoriasis Codrug, Naproxyl–Dithranol, on HaCaT Cells. Mol Pharm 2011; 8:2398-407. [DOI: 10.1021/mp200327k] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Wing Man Lau
- Welsh School of Pharmacy, Cardiff University, Cardiff CF10 3NB, U.K
| | - Keng Wooi Ng
- Welsh School of Pharmacy, Cardiff University, Cardiff CF10 3NB, U.K
| | - Alex W. White
- Welsh School of Pharmacy, Cardiff University, Cardiff CF10 3NB, U.K
| | - Charles M. Heard
- Welsh School of Pharmacy, Cardiff University, Cardiff CF10 3NB, U.K
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Torti DC, Christensen BC, Storm CA, Fortuny J, Perry AE, Zens MS, Stukel T, Spencer SK, Nelson HH, Karagas MR. Analgesic and nonsteroidal anti-inflammatory use in relation to nonmelanoma skin cancer: a population-based case-control study. J Am Acad Dermatol 2011; 65:304-312. [PMID: 21529996 DOI: 10.1016/j.jaad.2010.05.042] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2010] [Revised: 05/06/2010] [Accepted: 05/20/2010] [Indexed: 10/18/2022]
Abstract
BACKGROUND Aspirin and other nonsteroidal anti-inflammatory drugs (NSAIDs) are potentially chemopreventive. OBJECTIVE We examined the relation between NSAID use and nonmelanoma skin cancer in a population-based case-control study. METHODS NSAID and analgesic use was analyzed in 1484 participants: 535 with squamous cell carcinoma (SCC), 487 with basal cell carcinoma (BCC), and 462 control subjects. RESULTS Use of NSAIDs, particularly aspirin, was associated with a reduced odds ratio (OR) of SCC, especially tumors positive for p53 (OR 0.29; 95% confidence interval 0.11-0.79) or with PTCH loss of heterozygosity (OR 0.35; 95% confidence interval 0.13-0.96). Although not considered a NSAID, decreased ORs of both basal cell carcinoma and SCC were observed in relation to use of paracetamol (acetaminophen). Risk of BCC was unrelated to NSAID use. LIMITATIONS Self-reported drug use was a limitation. CONCLUSIONS This study supports the hypothesis that NSAIDs, aspirin in particular, may reduce risk of SCC and may affect specific molecular subtypes of SCC.
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Affiliation(s)
- Dorothea C Torti
- Section of Dermatology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Brock C Christensen
- Department of Pathology and Laboratory Medicine, Brown University, Providence, Rhode Island; Department of Community Health, Center for Environmental Health and Technology, Brown University, Providence, Rhode Island
| | - Craig A Storm
- Department of Pathology, Dartmouth Medical School, Hanover, New Hampshire
| | | | - Ann E Perry
- Department of Pathology, Dartmouth Medical School, Hanover, New Hampshire
| | - Michael S Zens
- Section of Biostatistics and Epidemiology, Dartmouth Medical School, Hanover, New Hampshire
| | - Therese Stukel
- Section of Biostatistics and Epidemiology, Dartmouth Medical School, Hanover, New Hampshire; Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada
| | - Steven K Spencer
- Section of Dermatology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Heather H Nelson
- Division of Epidemiology and Community Health, Masonic Cancer Center, University of Minnesota, Minneapolis, Minnesota
| | - Margaret R Karagas
- Section of Biostatistics and Epidemiology, Dartmouth Medical School, Hanover, New Hampshire.
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Banks SL, Paudel KS, Brogden NK, Loftin CD, Stinchcomb AL. Diclofenac enables prolonged delivery of naltrexone through microneedle-treated skin. Pharm Res 2011; 28:1211-9. [PMID: 21301935 DOI: 10.1007/s11095-011-0372-2] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2009] [Accepted: 01/18/2011] [Indexed: 10/18/2022]
Abstract
PURPOSE The purpose of this study was to determine if non-specific COX inhibition could extend pore lifetime in hairless guinea pigs following microneedle treatment. METHODS Hairless guinea pigs were treated with microneedle arrays ± daily application of Solaraze® gel (3% diclofenac sodium (non-specific COX inhibitor) and 2.5% hyaluronic acid); transepidermal water loss was utilized to evaluate pore lifetime. To examine the permeation of naltrexone, additional guinea pigs were treated with microneedles ± daily Solaraze® gel followed by application of a 16% transdermal naltrexone patch; pharmacokinetic analysis of plasma naltrexone levels was performed. Histological analysis was employed to visualize morphological changes following microneedle and Solaraze® treatment. RESULTS Animals treated with microneedles + Solaraze® displayed extended pore lifetime (determined by transepidermal water loss measurements) for up to 7 days. Enhanced naltrexone permeation was also observed for an extended amount of time in animals treated with microneedles + Solaraze®. No morphological changes resulting from microneedle treatment or COX inhibition were noted. CONCLUSIONS Non-specific COX inhibition is an effective means of extending pore lifetime following microneedle treatment in hairless guinea pigs. This may have clinical implications for extending transdermal patch wear time and therefore increasing patient compliance with therapy.
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What Can Current Stimulation Tell Us about the Vascular Function of Endogenous Prostacyclin in Healthy Rat Skin In Vivo? J Invest Dermatol 2011; 131:237-44. [DOI: 10.1038/jid.2010.267] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Minami S, Lum CA, Kitagawa KM, Namiki TS. Immunohistochemical expression of cyclooxygenage-2 in melanocytic skin lesions. Int J Dermatol 2010; 50:24-9. [DOI: 10.1111/j.1365-4632.2010.04628.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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35
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Borrelli S, Fanoni D, Dolfini D, Alotto D, Ravo M, Grober OMV, Weisz A, Castagnoli C, Berti E, Vigano MA, Mantovani R. C/EBPδ gene targets in human keratinocytes. PLoS One 2010; 5:e13789. [PMID: 21072181 PMCID: PMC2970548 DOI: 10.1371/journal.pone.0013789] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2010] [Accepted: 10/08/2010] [Indexed: 11/19/2022] Open
Abstract
C/EBPs are a family of B-Zip transcription factors -TFs- involved in the regulation of differentiation in several tissues. The two most studied members -C/EBPα and C/EBPβ- play important roles in skin homeostasis and their ablation reveals cells with stem cells signatures. Much less is known about C/EBPδ which is highly expressed in the granular layer of interfollicular epidermis and is a direct target of p63, the master regular of multilayered epithelia. We identified C/EBPδ target genes in human primary keratinocytes by ChIP on chip and profiling of cells functionally inactivated with siRNA. Categorization suggests a role in differentiation and control of cell-cycle, particularly of G2/M genes. Among positively controlled targets are numerous genes involved in barrier function. Functional inactivation of C/EBPδ as well as overexpressions of two TF targets -MafB and SOX2- affect expression of markers of keratinocyte differentiation. We performed IHC on skin tumor tissue arrays: expression of C/EBPδ is lost in Basal Cell Carcinomas, but a majority of Squamous Cell Carcinomas showed elevated levels of the protein. Our data indicate that C/EBPδ plays a role in late stages of keratinocyte differentiation.
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Affiliation(s)
- Serena Borrelli
- Dipartimento di Scienze Biomolecolari e Biotecnologie, Università degli Studi di Milano, Milano, Italy
| | - Daniele Fanoni
- Istituto di Scienze Dermatologiche, IRCCS Fondazione Ospedale Maggiore Policlinico, Mangiagalli e Regina Elena, Università degli Studi di Milano, Milano, Italy
| | - Diletta Dolfini
- Dipartimento di Scienze Biomolecolari e Biotecnologie, Università degli Studi di Milano, Milano, Italy
| | - Daniela Alotto
- Dipartimento di Chirurgia Plastica - Banca della Cute, Ospedale CTO, Torino, Italy
| | - Maria Ravo
- Dipartimento di Patologia Generale and Centro Grandi Apparecchiature, Seconda Università di Napoli, Napoli, Italy
| | - Olì Maria Victoria Grober
- Dipartimento di Patologia Generale and Centro Grandi Apparecchiature, Seconda Università di Napoli, Napoli, Italy
| | - Alessandro Weisz
- Dipartimento di Patologia Generale and Centro Grandi Apparecchiature, Seconda Università di Napoli, Napoli, Italy
- AIRC Naples Oncogenomics Centre, c/o CEINGE Biotecnologie Avanzate, Napoli, Italy
| | - Carlotta Castagnoli
- Dipartimento di Chirurgia Plastica - Banca della Cute, Ospedale CTO, Torino, Italy
| | - Emilio Berti
- Istituto di Scienze Dermatologiche, IRCCS Fondazione Ospedale Maggiore Policlinico, Mangiagalli e Regina Elena, Università degli Studi di Milano, Milano, Italy
- Università di Milano-Bicocca, Milano, Italy
| | - M. Alessandra Vigano
- Dipartimento di Scienze Biomolecolari e Biotecnologie, Università degli Studi di Milano, Milano, Italy
| | - Roberto Mantovani
- Dipartimento di Scienze Biomolecolari e Biotecnologie, Università degli Studi di Milano, Milano, Italy
- * E-mail:
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Hanson J, Gille A, Zwykiel S, Lukasova M, Clausen BE, Ahmed K, Tunaru S, Wirth A, Offermanns S. Nicotinic acid- and monomethyl fumarate-induced flushing involves GPR109A expressed by keratinocytes and COX-2-dependent prostanoid formation in mice. J Clin Invest 2010; 120:2910-9. [PMID: 20664170 DOI: 10.1172/jci42273] [Citation(s) in RCA: 149] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2010] [Accepted: 05/19/2010] [Indexed: 11/17/2022] Open
Abstract
The antidyslipidemic drug nicotinic acid and the antipsoriatic drug monomethyl fumarate induce cutaneous flushing through activation of G protein-coupled receptor 109A (GPR109A). Flushing is a troublesome side effect of nicotinic acid, but may be a direct reflection of the wanted effects of monomethyl fumarate. Here we analyzed the mechanisms underlying GPR109A-mediated flushing and show that both Langerhans cells and keratinocytes express GPR109A in mice. Using cell ablation approaches and transgenic cell type-specific GPR109A expression in Gpr109a-/- mice, we have provided evidence that the early phase of flushing depends on GPR109A expressed on Langerhans cells, whereas the late phase is mediated by GPR109A expressed on keratinocytes. Interestingly, the first phase of flushing was blocked by a selective cyclooxygenase-1 (COX-1) inhibitor, and the late phase was sensitive to a selective COX-2 inhibitor. Both monomethyl fumarate and nicotinic acid induced PGE2 formation in isolated keratinocytes through activation of GPR109A and COX-2. Thus, the early and late phases of the GPR109A-mediated cutaneous flushing reaction involve different epidermal cell types and prostanoid-forming enzymes. These data will help to guide new efficient approaches to mitigate nicotinic acid-induced flushing and may help to exploit the potential antipsoriatic effects of GPR109A agonists in the skin.
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Affiliation(s)
- Julien Hanson
- Department of Pharmacology, Max-Planck-Institute for Heart and Lung Research, Bad Nauheim, Germany
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37
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Borrelli S, Candi E, Hu B, Dolfini D, Ravo M, Grober OMV, Weisz A, Dotto GP, Melino G, Viganò MA, Mantovani R. The p63 target HBP1 is required for skin differentiation and stratification. Cell Death Differ 2010; 17:1896-907. [PMID: 20523354 DOI: 10.1038/cdd.2010.59] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Genetic experiments established that p63 is crucial for the development and maintenance of pluristratified epithelia. In the RNA interference (RNAi) screening for targets of p63 in keratinocytes, we identified the transcription factor, High Mobility Group (HMG) box protein 1 (HBP1). HBP1 is an HMG-containing repressor transiently induced during differentiation of several cell lineages. We investigated the relationship between the two factors: using RNAi, overexpression, chromatin immunoprecipitations and transient transfections with reporter constructs, we established that HBP1 is directly repressed by p63. This was further confirmed in vivo by evaluating expression in p63 knockout mice and in transgenics expressing p63 in basal keratinocytes. Consistent with these findings, expression of HBP1 increases upon differentiation of primary keratinocytes and HaCaT cells in culture, and it is higher in the upper layers of human skin. Inactivation of HBP1 by RNAi prevents differentiation of keratinocytes and stratification of organotypic skin cultures. Finally, we analyzed the keratinocyte transcriptomes after HBP1 RNAi; in addition to repression of growth-promoting genes, unexpected activation of differentiation genes was uncovered, coexisting with repression of other genes involved in epithelial cornification. Our data indicate that suppression of HBP1 is part of the growth-promoting strategy of p63 in the lower layers of epidermis and that HBP1 temporally coordinates expression of genes involved in stratification, leading to the formation of the skin barrier.
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Affiliation(s)
- S Borrelli
- Dipartimento di Scienze Biomolecolari e Biotecnologie, Università degli Studi di Milano, Via Celoria 26, 20133 Milano, Italy
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Garçon-Michel N, Roguedas-Contios AM, Rault G, Le Bihan J, Ramel S, Revert K, Dirou A, Misery L. Frequency of aquagenic palmoplantar keratoderma in cystic fibrosis: a new sign of cystic fibrosis? Br J Dermatol 2010; 163:162-6. [DOI: 10.1111/j.1365-2133.2010.09764.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Cyclooxygenase-2 immunohistochemistry in human melanoma: differences between results obtained with different antibodies. Melanoma Res 2010; 19:294-300. [PMID: 19543125 DOI: 10.1097/cmr.0b013e32832e0bde] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Several groups have reported that cyclooxygenase-2 (COX-2) expression is significantly enhanced in human melanomas, and that the expression of this protein may be useful as diagnostic and prognostic marker for the disease. At the same time, collective analysis of immunohistochemical data on the COX-2 expression in melanomas, presented by different researchers, shows a clear lack of consistency of reported results commonly assigned to differences in protocols used for the staining. This paper describes a study involving the parallel use of three different primary anti-COX-2 antibodies targeting different COX-2 epitopes. A surprising outcome is that although the three antibodies gave very consistent results for the COX-2 expression in keratinocytes, they showed significant differences in immunoreactivity for both melanocytic naevi and melanomas. This phenomenon has not been described before, and has implications for the selection of antibodies for studies on the diagnostic potential of COX-2 for melanoma.
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40
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Immunohistochemical analysis of cyclooxygenase-2 induction during wound healing in dog skin. Res Vet Sci 2009; 87:349-54. [DOI: 10.1016/j.rvsc.2009.05.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2009] [Revised: 04/07/2009] [Accepted: 05/05/2009] [Indexed: 12/12/2022]
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41
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Konger RL, Billings SD, Prall NC, Katona TM, Dasilva SC, Kennedy CRJ, Badve S, Perkins SM, Lacelle PT. The EP1 subtype of prostaglandin E2 receptor: role in keratinocyte differentiation and expression in non-melanoma skin cancer. Prostaglandins Leukot Essent Fatty Acids 2009; 81:279-90. [PMID: 19625175 PMCID: PMC2875085 DOI: 10.1016/j.plefa.2009.05.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Revised: 05/22/2009] [Accepted: 05/26/2009] [Indexed: 10/20/2022]
Abstract
We have previously demonstrated that the EP1 subtype of PGE2 receptor is expressed in the differentiated compartment of normal human epidermis and is coupled to intracellular calcium mobilization. We therefore hypothesized that the EP1 receptor is coupled to keratinocyte differentiation. In in vitro studies, radioligand binding, RT-PCR, immunoblot and receptor agonist-induced second messenger studies demonstrate that the EP1 receptor is up-regulated by high cell density in human keratinocytes and this up-regulation precedes corneocyte formation. Moreover, two different EP1 receptor antagonists, SC51322 and AH6809, both inhibited corneocyte formation. SC51322 also inhibited the induction of differentiation-specific proteins, cytokeratin K10 and epidermal transglutaminase. We next examined the immunolocalization of the EP1 receptor in non-melanoma skin cancer in humans. Well-differentiated SCCs exhibited significantly greater membrane staining, while spindle cell carcinomas and BCCs had significantly decreased membrane staining compared with normal epidermis. This data supports a role for the EP1 receptor in regulating keratinocyte differentiation.
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Affiliation(s)
- R L Konger
- Department of Pathology & Laboratory Medicine, Indiana University School of Medicine, 1120 South Drive, Fesler Hall 403, Indianapolis, IN 46202, USA.
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Abstract
Several studies illustrated considerably elevated levels of cyclooxygenase-2 (COX-2) protein in various types of human cancer including malignant melanoma. Recently, it was reported that COX-2 is strongly expressed in malignant melanoma and may be correlated with the development and progression of disease. In contrast, other groups did not detect COX-2 protein in primary melanoma cells but did in infiltrating inflammatory cells or metastases. However, there are no reports about patterns or alterations of COX-2 expression in melanoma cells during disease progression or of a correlation between COX-2 expression and overall survival. The aim of this study was to investigate whether there is a correlation between expression of COX-2 protein and disease prognosis in malignant melanoma. We therefore analyzed the expression of COX-2 protein by immunohistochemistry in 101 primary malignant melanomas and 28 metastases and correlated our data with Breslow tumor thickness, Clark levels, different melanoma subtypes, metastases, and overall survival. We detected a strong COX-2 expression in 95% of all primary melanomas, primarily restricted to melanoma cells as shown by various immunohistochemical methods. Levels of COX-2 expression in primary melanoma and corresponding metastases remained stable. A significant correlation between immunohistochemical staining intensity and tumor thickness was demonstrated. Furthermore, Kaplan-Meier curves illustrated a significant correlation between staining intensity and disease-specific survival. Our findings emphasize that the COX-2 protein might be a novel prognostic marker. Owing to its strong expression in melanoma cells it might also be a reasonable therapeutic target.
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43
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Clouser MC, Roe DJ, Foote JA, Harris RB. Effect of non-steroidal anti-inflammatory drugs on non-melanoma skin cancer incidence in the SKICAP-AK trial. Pharmacoepidemiol Drug Saf 2009; 18:276-83. [PMID: 19226541 DOI: 10.1002/pds.1718] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Recent studies link the prostaglandin metabolic pathway to skin carcinogenesis expanding possibilities that cyclooxygenase (COX) inhibitors may be utilized in non-melanoma skin cancer (NMSC) chemoprevention. Using data from a study of the efficacy of retinol supplementation on incidence of NMSC, we sought to determine the role of non-steroidal anti-inflammatory drugs (NSAIDs) in NMSC development. Cox proportional hazards models describe the relationship between NSAID use and time to first squamous cell carcinoma (SCC) or basal cell carcinoma (BCC) among participants categorized by use pattern: continuous users (use for length of study duration), new users (use for less than study duration), and non-users. For SCC and BCC, there was a statistically significant protective effect for participants who reported use for less than the study duration (HR = 0.49, 95%CI 0.28-0.87 and HR = 0.43, 95%CI 0.25-0.73, respectively). Categorical examination of NSAIDs (aspirin (ASA) vs. non-ASA NSAIDs) showed significant effects for BCC among those using non-ASA NSAIDs for less than the study duration (HR = 0.33, 95%CI 0.13-0.80). For SCC and BCC, NSAID use of shorter duration and potentially more recent, was more protective than longer duration of use. These results are counter to the idea that longer duration of NSAID use is more protective. Additional investigations are needed into the role NSAIDs play in the chemoprevention of NMSC.
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Affiliation(s)
- Mary C Clouser
- Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ 85719, USA.
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Xu Y, Yang L, Yang T, Xiang M, Huang E, Lian X. Expression pattern of cyclooxygenase-2 in normal rat epidermis and pilosebaceous unit during hair cycle. Acta Histochem Cytochem 2008; 41:157-63. [PMID: 19180200 PMCID: PMC2629551 DOI: 10.1267/ahc.08024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2008] [Accepted: 09/19/2008] [Indexed: 11/22/2022] Open
Abstract
As an important member of the cyclooxygenase isoenzymes, cyclooxygenase-2 (COX-2) mainly catalyzes the first two steps in prostanoid synthesis. In mammalian animals, although COX-2 was thought to be rarely expressed in most normal tissues and was usually upregulated in a variety of epithelial tumors and inflammatory reactions, recently it was reported that COX-2 could localize in the epidermis as well as the pilosebaceous unit of the normal human and mouse skin. Until now, the function of COX-2 in normal skin has remained unknown. To investigate the possible roles of COX-2 in normal skin by RT-PCR and immunochemistry, we studied the expression pattern of COX-2 in hair cycle of the normal rat skin. The expression of COX-2 mRNA was detected in normal rat skin sample and was related to the hair follicle cycle. When the hair cycle entered catagen and telogen, COX-2 mRNA transcription in skin increased significantly. Furthermore, the location of COX-2 immunoreactivity showed that COX-2 protein is mainly concentrated in the epidermis and pilosebaceous unit. In the stratified epidermis, the strong COX-2 protein expression was detected in the suprabasal layers of epidermis in anagen and declined in catagen and telogen. In hair follicle, COX-2 protein was obviously expressed in the outer root sheath of the anagen hair follicle, and was barely detectable in catagen as well as telogen. In the sebaceous gland, the COX-2 protein expression became more intense in catagen and telogen, with an increase in sebaceous gland size. Our results suggested that COX-2 was not specific to some abnormal tissues and was indeed involved in the normal physiology of rat skin, such as the differentiation of epidermis, the morphogenesis of the hair follicle, the transformation of hair cycle stages, and the lipid production of the sebaceous gland.
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Affiliation(s)
- Yuanxu Xu
- Department of Cell Biology, Third Military Medical University
| | - Li Yang
- Department of Bioengineering, Chongqing University
| | - Tian Yang
- Department of Cell Biology, Third Military Medical University
| | - Mingming Xiang
- Department of Dermatology, Third Military Medical University
| | - Enyi Huang
- Department of Bioengineering, Chongqing University
| | - Xiaohua Lian
- Department of Cell Biology, Third Military Medical University
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Wilfong ER, Jederberg WW, Arfsten DP, Johnson EW, Thitoff AR, Brinkley WW, Schaeffer DJ. Effects of Subchronic Dermal Application of Break-Free CLP® in CD-1 Mice. Cutan Ocul Toxicol 2008. [DOI: 10.1081/cus-200068635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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46
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Urade M. Cyclooxygenase (COX)-2 as a potent molecular target for prevention and therapy of oral cancer. JAPANESE DENTAL SCIENCE REVIEW 2008. [DOI: 10.1016/j.jdsr.2007.10.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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Sakurai K, Urade M, Noguchi K, Hashitani S, Takaoka K, Segawa E, Kishimoto H. Prognostic significance of cyclooxygenase-2 and DNA topoisomerase IIalpha expression in oral carcinoma. Head Neck 2008; 29:1002-9. [PMID: 17427971 DOI: 10.1002/hed.20627] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND Despite recent advances in the diagnosis and treatment of oral carcinoma, outcomes remain disappointing. The identification of new prognostic factors is necessary to improve survival. To determine the prognostic significance of cyclooxygenase (COX)-2 and DNA topoisomerase (DNA-Topo) IIalpha expression in patients with oral carcinoma, we immunohistochemically examined these enzymes and studied their relation to overall 5-year survival. METHODS Surgical specimens were obtained from 160 patients with oral carcinoma, 80 with and 80 without regional lymph node metastasis. The specimens were immunostained for COX-2 and DNA-Topo IIalpha as an index of cell proliferative activity. COX-2 immunoreactivity and clinicopathological data were analyzed, and 5-year survival was calculated by the Kaplan-Meier method. RESULTS COX-2 expression in primary lesions was higher in cases with lymph node metastasis than in those without lymph node metastasis. An increase in tumor size was associated with increased COX-2 expression. In most cases with lymph node metastasis, COX-2 expression was higher in metastatic lesions than in primary lesions. As COX-2 expression increased, the DNA-Topo IIalpha labeling index significantly increased and the overall 5-year survival rate decreased. CONCLUSION Expression of COX-2 and DNA-Topo IIalpha were related to lymph node metastasis, cell proliferative activity, and overall 5-year survival rate in oral carcinoma. These enzymes may therefore be valuable diagnostic and prognostic indices in oral carcinoma.
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Affiliation(s)
- Kazunari Sakurai
- Department of Oral and Maxillofacial Surgery, Hyogo College of Medicine, 1-1, Mukogawa-cho, Nishinomiya, Hyogo 663-8501, Japan
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Oesch F, Fabian E, Oesch-Bartlomowicz B, Werner C, Landsiedel R. Drug-metabolizing enzymes in the skin of man, rat, and pig. Drug Metab Rev 2007; 39:659-98. [PMID: 18058329 DOI: 10.1080/03602530701690366] [Citation(s) in RCA: 129] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The mammalian skin has long been considered to be poor in drug metabolism. However, many reports clearly show that most drug metabolizing enzymes also occur in the mammalian skin albeit at relatively low specific activities. This review summarizes the current state of knowledge on drug metabolizing enzymes in the skin of human, rat, and pig, the latter, because it is often taken as a model for human skin on grounds of anatomical similarities. However only little is known about drug metabolizing enzymes in pig skin. Interestingly, some cytochromes P450 (CYP) have been observed in the rat skin which are not expressed in the rat liver, such as CYP 2B12 and CYP2D4. As far as investigated most drug metabolizing enzymes occur in the suprabasal (i.e. differentiating) layers of the epidermis, but the rat CYP1A1 rather in the basal layer and human UDP-glucuronosyltransferase rather in the stratum corneum. The pattern of drug metabolizing enzymes and their localization will impact not only the beneficial as well as detrimental properties of drugs for the skin but also dictate whether a drug reaches the blood flow unchanged or as activated or inactivated metabolite(s).
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Affiliation(s)
- Franz Oesch
- Institute of Toxicology, University of Mainz, Mainz, Germany.
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Shen J, Pavone A, Mikulec C, Hensley SC, Traner A, Chang TK, Person MD, Fischer SM. Protein expression profiles in the epidermis of cyclooxygenase-2 transgenic mice by 2-dimensional gel electrophoresis and mass spectrometry. J Proteome Res 2007; 6:273-86. [PMID: 17203971 DOI: 10.1021/pr060418h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Exposure of murine skin to tumor-promoting agents such as 12-O-tetradecanoyl-phorbol-13-acetate (TPA) causes up-regulation of cyclooxygenase-2 (COX-2) and increased prostaglandin (PG) synthesis. Pharmacological inhibition of COX-2 significantly reduces skin tumor development. However, we previously demonstrated that K14.COX-2 transgenic (TG) mice that overexpressed COX-2 in the epidermis were unexpectedly resistant to tumor development under the classical 7,12-dimethylbenz[a]anthracene-TPA protocol. In the present study, we employed a proteomic approach of 2-dimensional gel electrophoresis (2-DE) and mass spectrometry to profile differentially expressed proteins in the epidermis of K14.COX-2 TG and wild-type control mice. Various 2-DE approaches were used to identify the maximum number of differentially expressed proteins: 20 for untreated samples, 3 for acetone-treated samples, and 22 for TPA-treated samples. These proteins include 14-3-3 sigma, numerous actin fragments, actin filament related proteins cofilin-1 and destrin, galectin-3, galectin-7, prohibitin, S100A6, S100A9, and many others. The differential expression of galectin-3, galectin-7, S100A9 was validated by Western blot analysis and/or immunohistochemical analysis. The current data suggest that some of the differentially expressed proteins might increase apoptosis and cell cycle arrest, which, in turn, may provide insight into the role of COX-2 in skin tumorigenesis.
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Affiliation(s)
- Jianjun Shen
- The University of Texas M. D. Anderson Cancer Center, Science Park-Research Division, Smithville, Texas 78957, USA
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Kim JI, Jin JK, Choi EK, Spinner D, Rubenstein R, Carp RI, Kim YS. Increased expression and localization of cyclooxygenase-2 in astrocytes of scrapie-infected mice. J Neuroimmunol 2007; 187:74-82. [PMID: 17524497 DOI: 10.1016/j.jneuroim.2007.04.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2007] [Accepted: 04/10/2007] [Indexed: 02/02/2023]
Abstract
A number of aspects of the pathogenesis of scrapie, the archetype disease of the transmissible spongiform encephalopathies (prion disorders), remain to be elucidated. There is increasing evidence that there are cerebral based inflammatory processes that may contribute to the pathogenesis and to the progression of a number of neurodegenerative disorders, including prion diseases. In peripheral tissues, a key element that controls the generation of proinflammatory mediators is the highly inducible protein cyclooxygenase-2 (COX-2). In this study, in order to examine the possible association of COX-2 with the pathogenesis of scrapie, we analyzed the expression level and the cellular localization of COX-2 in the brains of control and scrapie-infected mice. The COX-2 mRNA and protein levels were increased significantly compared to the control group of mice. By immunohistological analysis, intense immunoreactivity of COX-2 was localized primarily in reactive astrocytes, with virtually no staining in sections from control mice. The staining for COX-2 was co-localized with the pathological form of the prion protein (PrP(Sc)) and with nuclear factor-kappa B (NF-kappaB). These results suggest that the upregulation of COX-2 expression in astrocytes may be related to the accumulation of PrP(Sc), and that COX-2 may then lead to the progression of scrapie, possibly by propagation of a cerebral inflammatory response.
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Affiliation(s)
- Jae-Il Kim
- New York State Institute for Basic Research, Staten Island, New York, USA.
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