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Lei D, Ye L, Wen S, Zhang J, Zhang L, Man MQ. Preventive and Therapeutic Benefits of Natural Ingredients in Photo-Induced Epidermal Dysfunction. Skin Pharmacol Physiol 2024:1-18. [PMID: 38615652 DOI: 10.1159/000538832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 04/03/2024] [Indexed: 04/16/2024]
Abstract
BACKGROUND The skin, particularly the epidermis, is subjected to various external stresses, including ultraviolet (UV) irradiation. UV irradiation, mainly UVB at wavelength of 280-315 nm, can alter several epidermal functions, including cutaneous inflammation, epidermal hyperproliferation, DNA damage, disruption of epidermal permeability barrier and reduction in stratum corneum hydration levels. Because of the negative impacts of UVB irradiation on epidermal functions, great efforts have been made to develop regimens for the protection of alterations in epidermal function induced by UV irradiation. SUMMARY While sunscreen can provide physical barrier to UV light, some natural ingredients can also effectively protect the skin from UVB irradiation-induced damages. Studies have demonstrated that either topical or oral administrations of some natural ingredients attenuate UVB irradiation-induced alterations in the epidermal function. The underlying mechanisms by which natural ingredients improve epidermal functions are attributable to antioxidation, stimulation of keratinocyte differentiation, increases in the content of epidermal natural moisturizers and inhibition of inflammation. KEY MESSAGE Some natural ingredients exhibit protective and therapeutical benefits in photo-induced epidermal dysfunctions via divergent mechanisms.
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Affiliation(s)
- Dongyun Lei
- Department of Dermatology, Tianjin Academy of Traditional Chinese Medicine Affiliated Hospital, Tianjin, China
| | - Li Ye
- Dermatology Hospital, Southern Medical University, Guangzhou, China
| | - Si Wen
- Dermatology Hospital, Southern Medical University, Guangzhou, China
| | - Junling Zhang
- Department of Dermatology, Tianjin Academy of Traditional Chinese Medicine Affiliated Hospital, Tianjin, China
| | - Litao Zhang
- Department of Dermatology, Tianjin Academy of Traditional Chinese Medicine Affiliated Hospital, Tianjin, China
| | - Mao-Qiang Man
- Dermatology Hospital, Southern Medical University, Guangzhou, China
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2
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Saddik MS, Elsayed MMA, El-Mokhtar MA, Sedky H, Abdel-Aleem JA, Abu-Dief AM, Al-Hakkani MF, Hussein HL, Al-Shelkamy SA, Meligy FY, Khames A, Abou-Taleb HA. Tailoring of Novel Azithromycin-Loaded Zinc Oxide Nanoparticles for Wound Healing. Pharmaceutics 2022; 14:111. [PMID: 35057019 PMCID: PMC8780377 DOI: 10.3390/pharmaceutics14010111] [Citation(s) in RCA: 54] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/21/2021] [Accepted: 12/28/2021] [Indexed: 02/04/2023] Open
Abstract
Skin is the largest mechanical barrier against invading pathogens. Following skin injury, the healing process immediately starts to regenerate the damaged tissues and to avoid complications that usually include colonization by pathogenic bacteria, leading to fever and sepsis, which further impairs and complicates the healing process. So, there is an urgent need to develop a novel pharmaceutical material that promotes the healing of infected wounds. The present work aimed to prepare and evaluate the efficacy of novel azithromycin-loaded zinc oxide nanoparticles (AZM-ZnONPs) in the treatment of infected wounds. The Box-Behnken design and response surface methodology were used to evaluate loading efficiency and release characteristics of the prepared NPs. The minimum inhibitory concentration (MIC) of the formulations was determined against Staphylococcus aureus and Escherichia coli. Moreover, the anti-bacterial and wound-healing activities of the AZM-loaded ZnONPs impregnated into hydroxyl propyl methylcellulose (HPMC) gel were evaluated in an excisional wound model in rats. The prepared ZnONPs were loaded with AZM by adsorption. The prepared ZnONPs were fully characterized by XRD, EDAX, SEM, TEM, and FT-IR analysis. Particle size distribution for the prepared ZnO and AZM-ZnONPs were determined and found to be 34 and 39 nm, respectively. The mechanism by which AZM adsorbed on the surface of ZnONPs was the best fit by the Freundlich model with a maximum load capacity of 160.4 mg/g. Anti-microbial studies showed that AZM-ZnONPs were more effective than other controls. Using an experimental infection model in rats, AZM-ZnONPs impregnated into HPMC gel enhanced bacterial clearance and epidermal regeneration, and stimulated tissue formation. In conclusion, AZM -loaded ZnONPs are a promising platform for effective and rapid healing of infected wounds.
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Affiliation(s)
- Mohammed S. Saddik
- Department of Pharmaceutics and Clinical Pharmacy, Faculty of Pharmacy, Sohag University, P.O. Box 82524, Sohag 82524, Egypt;
| | - Mahmoud M. A. Elsayed
- Department of Pharmaceutics and Clinical Pharmacy, Faculty of Pharmacy, Sohag University, P.O. Box 82524, Sohag 82524, Egypt;
| | - Mohamed A. El-Mokhtar
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Assiut University, Assiut 71515, Egypt;
| | - Haitham Sedky
- Department of Microbiology and Immunology, Faculty of Pharmacy, Assiut University, Assiut 71515, Egypt;
| | - Jelan A. Abdel-Aleem
- Department of Industrial Pharmacy, Faculty of Pharmacy, Assiut University, Assiut 71516, Egypt;
| | - Ahmed M. Abu-Dief
- Chemistry Department, College of Science, Taibah University, Madinah 42353, Saudi Arabia;
- Chemistry Department, Faculty of Science, Sohag University, Sohag 82524, Egypt
| | - Mostafa F. Al-Hakkani
- Department of Chemistry, Faculty of Science, Al-Azhar University, Assiut Branch, Assiut 71524, Egypt;
- Department of Chemistry, Faculty of Science, New Valley University, El-Kharja 72511, Egypt
| | - Hazem L. Hussein
- Department of Dermatology, Venereology and Andrology, Faculty of Medicine, Al-Azhar University, Assiut Branch, Assiut 71524, Egypt;
| | - Samah A. Al-Shelkamy
- Department of Physics, Faculty of Science, New Valley University, El-Kharja 72511, Egypt;
| | - Fatma Y. Meligy
- Department Histology, Faculty of Medicine, Assiut University, Assiut 71524, Egypt;
| | - Ali Khames
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Sohag University, Sohag 82524, Egypt;
| | - Heba A. Abou-Taleb
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Merit University (MUE), Sohag 82755, Egypt;
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3
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Denda M, Nakanishi S. Do epidermal keratinocytes have sensory and information processing systems? Exp Dermatol 2021; 31:459-474. [PMID: 34726302 DOI: 10.1111/exd.14494] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 10/26/2021] [Accepted: 10/30/2021] [Indexed: 01/22/2023]
Abstract
It was long considered that the role of epidermal keratinocytes is solely to construct a water-impermeable protective membrane, the stratum corneum, at the uppermost layer of the skin. However, in the last two decades, it has been found that keratinocytes contain multiple sensory systems that detect environmental changes, including mechanical stimuli, sound, visible radiation, electric fields, magnetic fields, temperature and chemical stimuli, and also a variety of receptor molecules associated with olfactory or taste sensation. Moreover, neurotransmitters and their receptors that play crucial roles in the brain are functionally expressed in keratinocytes. Recent studies have demonstrated that excitation of keratinocytes can induce sensory perception in the brain. Here, we review the sensory and information processing capabilities of keratinocytes. We discuss the possibility that epidermal keratinocytes might represent the earliest stage in the development of the brain during the evolution of vertebrates.
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Affiliation(s)
- Mitsuhiro Denda
- Institute for Advanced Study of Mathematical Sciences, Meiji University, Nakano-ku, Tokyo, 164-8525, Japan
| | - Shinobu Nakanishi
- Shiseido Global Innovation Center, Nishi-ku, Yokohama, 220-0011, Japan
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4
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Majewski G, Craw J, Falla T. Accelerated Barrier Repair in Human Skin Explants Induced with a Plant-Derived PPAR-α Activating Complex via Cooperative Interactions. Clin Cosmet Investig Dermatol 2021; 14:1271-1293. [PMID: 34566418 PMCID: PMC8458040 DOI: 10.2147/ccid.s325967] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 08/28/2021] [Indexed: 12/27/2022]
Abstract
Background Peroxisome proliferator-activated receptors (PPARs) govern epidermal lipid synthesis and metabolism. In skin, PPAR activation has been shown to regulate genes responsible for permeability barrier homeostasis, epidermal differentiation, lipid biosynthesis, and inflammation. Objective Given the known dermatologic benefits of PPARs, we set out to discover a naturally derived, multi-molecule complex that would be superior to the more commonly formulated conjugated linoleic acids (CLAs). We hypothesized that a complex may be capable of modulating PPAR-α by cooperative or multi-ligand binding interactions to accelerate skin barrier repair. Methods To achieve this, we assembled a novel PPAR-α agonist complex, referred to as RFV3, from a combination of small molecules routinely used in Ayurvedic medicine and accepted in cosmetic and topical over-the-counter dermatologic products. We tested RFV3’s potential as a PPAR-α agonist by evaluating its transcriptional response, ligand binding affinity to PPAR-α, gene expression profiles and barrier repair properties in human skin explant models. Results We assembled RFV3 by solubilizing two standardized plant extracts in a suitable solvent and induced a significant transcriptional response in PPAR-α luciferase reporter assay. Furthermore, transcriptome profiling of RFV3-treated epidermal substitutes revealed expressed genes consistent with known targets of PPAR-α, including those involved in epidermal barrier repair. In addition, in silico modeling demonstrated differential co-binding affinities of RFV3 to PPAR-α compared with those of the endogenous ligands (CLAs) and a synthetic PPAR-α agonist. Lastly, delipidated skin explant models confirmed accelerated barrier repair activity with significant increases in ceramides, filaggrin and transglutaminase-1 after treatment. Conclusion These findings suggest that the RFV3 complex successfully mimics a PPAR-α agonist and induces synthesis of skin barrier lipids and proteins consistent with known PPAR pathways.
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Affiliation(s)
- George Majewski
- Rodan & Fields, San Francisco, CA, 94105, USA.,Present Affiliation: Contrast Product Development, Walnut, CA, 91789, USA
| | - John Craw
- Rodan & Fields, San Francisco, CA, 94105, USA
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5
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Gangadevi V, Thatikonda S, Pooladanda V, Devabattula G, Godugu C. Selenium nanoparticles produce a beneficial effect in psoriasis by reducing epidermal hyperproliferation and inflammation. J Nanobiotechnology 2021; 19:101. [PMID: 33849555 PMCID: PMC8042708 DOI: 10.1186/s12951-021-00842-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Accepted: 03/24/2021] [Indexed: 11/17/2022] Open
Abstract
Background Psoriasis is a chronic autoimmune skin disease characterized by hyperproliferation of keratinocytes. Wide treatment options used to treat psoriasis is associated with various adverse effects. To overcome this nanoformulation is prepared. Selenium is an essential trace element and plays major role in oxidation reduction system. Toxicity and stability limits the applications of selenium. Toxicity can be reduced and stabilized upon preparation into nanoparticles. Results Selenium nanoparticles (SeNPs) exhibit potent apoptosis through the generation of reactive oxygen species (ROS) with cell cycle arrest. SeNPs topical gel application produced significant attenuation of psoriatic severity with the abrogation of acanthosis and splenomegaly. SeNPs reduced the phosphorylation and expressions of MAPKs, STAT3, GSK-3β, Akt along with PCNA, Ki67, and cyclin-D1. Conclusion SeNPs inhibit various inflammation and proliferation mediated pathways and could be an ideal candidate for psoriasis therapy. Materials and methods SeNPs were characterized and various techniques were used to determine apoptosis and other molecular mechanisms. In vivo studies were performed by inducing psoriasis with imiquimod (IMQ). SeNPs were administered via topical route.
Graphic Abstract ![]()
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Affiliation(s)
- Vinod Gangadevi
- Department of Regulatory Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Balanagar, Hyderabad, Telangana, 500037, India
| | - Sowjanya Thatikonda
- Department of Regulatory Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Balanagar, Hyderabad, Telangana, 500037, India
| | - Venkatesh Pooladanda
- Department of Regulatory Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Balanagar, Hyderabad, Telangana, 500037, India
| | - Geetanjali Devabattula
- Department of Regulatory Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Balanagar, Hyderabad, Telangana, 500037, India
| | - Chandraiah Godugu
- Department of Regulatory Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Balanagar, Hyderabad, Telangana, 500037, India.
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6
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Yang R, Chowdhury S, Choudhary V, Chen X, Bollag WB. Keratinocyte aquaporin-3 expression induced by histone deacetylase inhibitors is mediated in part by peroxisome proliferator-activated receptors (PPARs). Exp Dermatol 2020; 29:380-386. [PMID: 32003033 DOI: 10.1111/exd.14080] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 01/13/2020] [Accepted: 01/26/2020] [Indexed: 01/10/2023]
Abstract
The water and glycerol channel, aquaporin-3 (AQP3), plays an important role in the skin epidermis, with effects on hydration, permeability barrier repair and wound healing; therefore, information about the mechanisms regulating its expression is important for a complete understanding of skin function physiologically and in disease conditions. We previously demonstrated that histone deacetylase inhibitors (HDACi) induce the mRNA and protein expression of AQP3, in part through the p53 family, transcription factors for which acetylation is known to affect their regulatory activity. Another set of transcription factors previously shown to induce AQP3 expression and/or regulate skin function are the peroxisome proliferator-activated receptors (PPARs). Since there are reports that PPARs are also acetylated, we examined the involvement of these nuclear hormone receptors in HDACi-induced AQP3 expression. We first verified that a PPARγ agonist upregulated AQP3 mRNA and protein levels and that this increase was blocked by a PPARγ antagonist. We then showed that the PPARγ antagonist also inhibited AQP3 expression induced both by a broad-spectrum HDACi and an HDAC3-selective inhibitor. Interestingly, a PPARα antagonist also inhibited HDACi-induced AQP3 expression. These antagonist effects were observed in both primary mouse and normal human keratinocytes. Furthermore, PPARγ overexpression enhanced HDACi-stimulated AQP3 mRNA levels. Thus, our results suggest that PPARγ and/or PPARα may play a role in regulating AQP3 levels in the skin; based on the ability of PPAR agonists to promote epidermal differentiation and/or inhibit proliferation, topical PPAR agonists might be considered as a therapy for hyperproliferative skin disorders, such as psoriasis.
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Affiliation(s)
- Rong Yang
- Department of Physiology, Jianghan University Medical School, Wuhan, China.,Department of Physiology, Medical College of Georgia at Augusta University, Augusta, GA, USA
| | - Shinjini Chowdhury
- Department of Physiology, Medical College of Georgia at Augusta University, Augusta, GA, USA
| | - Vivek Choudhary
- Department of Physiology, Medical College of Georgia at Augusta University, Augusta, GA, USA.,Charlie Norwood VA Medical Center, Augusta, GA, USA
| | - Xunsheng Chen
- Department of Physiology, Medical College of Georgia at Augusta University, Augusta, GA, USA.,Charlie Norwood VA Medical Center, Augusta, GA, USA
| | - Wendy B Bollag
- Department of Physiology, Medical College of Georgia at Augusta University, Augusta, GA, USA.,Charlie Norwood VA Medical Center, Augusta, GA, USA.,Department of Medicine (Dermatology), Medical College of Georgia at Augusta University, Augusta, GA, USA
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7
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Natesan S, Wrice NL, Christy RJ. Peroxisome proliferator‐activated receptor‐α agonist and all‐
trans
retinoic acid induce epithelial differentiation of subcutaneous adipose‐derived stem cells from debrided burn skin. J Cell Biochem 2018; 120:9213-9229. [DOI: 10.1002/jcb.28197] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 11/12/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Shanmugasundaram Natesan
- Combat Trauma and Burn Injury Research United States Army Institute of Surgical Research Fort Sam Houston Texas
| | - Nicole L. Wrice
- Combat Trauma and Burn Injury Research United States Army Institute of Surgical Research Fort Sam Houston Texas
| | - Robert J. Christy
- Combat Trauma and Burn Injury Research United States Army Institute of Surgical Research Fort Sam Houston Texas
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8
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Bakry OA, Shoeib MAEM, El Kady N, Attalla S. Re-appraisal of Keratinocytes' Role in Vitiligo Pathogenesis. Indian J Dermatol 2018; 63:231-240. [PMID: 29937560 PMCID: PMC5996628 DOI: 10.4103/ijd.ijd_520_17] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Background Vitiligo is a common pigmentary disorder. Studies on its pathogenesis extensively investigated melanocytes' abnormalities and few studies searched for keratinocytes' role in disease development. Liver X receptor-α (LXR-α) is a member of nuclear hormone receptors that acts as a transcription factor. Its target genes are the main regulators of melanocyte functions. Aim The aim of this study is to investigate keratinocytes' role in vitiligo pathogenesis through immunohistochemical expression of LXR-α in lesional, perilesional, and distant nonlesional vitiligo skin. Materials and Methods This case-control study was carried out on 44 participants. These included 24 patients with vitiligo and 20 age- and sex-matched normal individuals as a control group. Biopsies, from cases, were taken from lesional, perilesional, and distant nonlesional areas. Evaluation was done using immunohistochemical technique. Results Keratinocyte LXR-α expression was upregulated in the lesional and perilesional skin (follicular and interfollicular epidermis) compared with control skin (P <0.001 for all). There was significant association between higher histoscore (H-score) in lesional epidermis (P <0.001) and in hair follicle (P =0.001) and the presence of angiogenesis. There was significant association between higher H-score in lesional epidermis and suprabasal vacuolization (P =0.02). No significant association was found between H-score or expression percentage and clinical data of selected cases. Conclusion LXR-α upregulation is associated with keratinocyte damage in vitiligo lesional skin that leads to decreased keratinocyte-derived mediators and growth factors supporting the growth and/or melanization of surrounding melanocytes. Therefore, melanocyte function and survival are affected.
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Affiliation(s)
- Ola Ahmed Bakry
- Department of Dermatology, Andrology and STDs, Faculty of Medicine, Menoufiya University, Shebeen El-Kom, Egypt
| | | | - Noha El Kady
- Department of Pathology, Faculty of Medicine, Menoufiya University, Shebeen El-Kom, Egypt
| | - Shereen Attalla
- Department of Dermatology, Andrology and STDs, Faculty of Medicine, Menoufiya University, Shebeen El-Kom, Egypt
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9
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Furue K, Mitoma C, Tsuji G, Furue M. Protective role of peroxisome proliferator-activated receptor α agonists in skin barrier and inflammation. Immunobiology 2017; 223:327-330. [PMID: 29111315 DOI: 10.1016/j.imbio.2017.10.047] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 10/24/2017] [Indexed: 01/10/2023]
Abstract
Peroxisome proliferator-activated receptor α (PPARα) is one of the three isoforms of PPARs, which are ligand-activated nuclear transcription factors. PPARα is highly expressed in liver and its agonists are widely used to treat hyperlipidemia. Epidermal keratinocytes express all three isoforms (α, β/δ, and γ) of PPARs and PPARα is particularly important for regulating the epidermal barrier and inflammation. Agonistic ligation of PPARα protects the epidermal barrier function and inhibits the inflammatory response in dermatitis. In this review, we summarize recent topics on the role of PPARα in skin biology and discuss the potential use of topical PPARα agonists for treating atopic dermatitis and other eczemas.
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Affiliation(s)
- Kazuhisa Furue
- Department of Dermatology, Kyushu University, Fukuoka, Japan
| | - Chikage Mitoma
- Department of Dermatology, Kyushu University, Fukuoka, Japan; Research and Clinical Center for Yusho and Dioxin, Kyushu University, Fukuoka, Japan
| | - Gaku Tsuji
- Department of Dermatology, Kyushu University, Fukuoka, Japan
| | - Masutaka Furue
- Department of Dermatology, Kyushu University, Fukuoka, Japan; Research and Clinical Center for Yusho and Dioxin, Kyushu University, Fukuoka, Japan; Division of Skin Surface Sensing, Department of Dermatology, Kyushu University, Fukuoka, Japan.
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10
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El-Lithy GM, El-Bakly WM, Matboli M, Abd-Alkhalek HA, Masoud SI, Hamza M. Prophylactic L-arginine and ibuprofen delay the development of tactile allodynia and suppress spinal miR-155 in a rat model of diabetic neuropathy. Transl Res 2016; 177:85-97.e1. [PMID: 27392937 DOI: 10.1016/j.trsl.2016.06.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 06/11/2016] [Accepted: 06/14/2016] [Indexed: 02/08/2023]
Abstract
Diabetic neuropathy (DN) is a common complication of diabetes mellitus that is hardly reversible at the late stages. Since treatment of neuropathic pain is predominantly symptomatic, a prophylactic measure would be useful. Both ibuprofen and L-arginine exert antiallodynic effects on chronic constriction injury (CCI)-induced cold allodynia. Furthermore, ibuprofen is effective in CCI-induced mechanical allodynia. The aim of the study was to assess the antiallodynic effect of prophylactic ibuprofen and L-arginine in streptozotocin-induced DN in rats and to further investigate the role of spinal miR-155 and nitric oxide (NO) in this effect. Tactile allodynia was assessed weekly by von Frey filaments. Oral daily administration of ibuprofen, L-arginine and their combination, for 4 weeks starting 1 week after streptozotocin injection (ie, before the development of tactile allodynia), resulted in a significant decrease of tactile allodynia compared with the control diabetic group. This was evident in the fifth week of the experiment. The 3 treatments prevented the decrease in muscle fiber diameter and epidermal thickness, seen in the control diabetic group. Furthermore, ibuprofen, L-arginine and their combination prevented the increase in the spinal NO level and miRNA-155, seen in the control diabetic group. In conclusion, both ibuprofen and L-arginine delayed the development of behavioral and histologic changes of DN, with concomitant suppression of spinal miR-155 and NO level. L-arginine being tolerable may be useful prophylactically in diabetic patients.
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Affiliation(s)
- Ghada M El-Lithy
- Department of Pharmacology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Wesam M El-Bakly
- Department of Pharmacology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Marwa Matboli
- Department of Biochemistry, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Hadwa A Abd-Alkhalek
- Department of Histology and Cell Biology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Somaia I Masoud
- Department of Pharmacology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - May Hamza
- Department of Pharmacology, Faculty of Medicine, Ain Shams University, Cairo, Egypt.
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11
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Yin K, Smith AG. Nuclear receptor function in skin health and disease: therapeutic opportunities in the orphan and adopted receptor classes. Cell Mol Life Sci 2016; 73:3789-800. [PMID: 27544210 PMCID: PMC11108460 DOI: 10.1007/s00018-016-2329-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 08/04/2016] [Indexed: 12/12/2022]
Abstract
The skin forms a vital barrier between an organism's external environment, providing protection from pathogens and numerous physical and chemical threats. Moreover, the intact barrier is essential to prevent water and electrolyte loss without which terrestrial life could not be maintained. Accordingly, acute disruption of the skin through physical or chemical trauma needs to be repaired timely and efficiently as sustained skin pathologies ranging from mild irritations and inflammation through to malignancy impact considerably on morbidity and mortality. The Nuclear Hormone Receptor Family of transcriptional regulators has proven to be highly valuable targets for addressing a range of pathologies, including metabolic syndrome and cancer. Indeed members of the classic endocrine sub-group, such as the glucocorticoid, retinoid, and Vitamin D receptors, represent mainstay treatment strategies for numerous inflammatory skin disorders, though side effects from prolonged use are common. Emerging evidence has now highlighted important functional roles for nuclear receptors belonging to the adopted and orphan subgroups in skin physiology and patho-physiology. This review will focus on these subgroups and explore the current evidence that suggests these nuclear receptor hold great promise as future stand-alone or complementary drug targets in treating common skin diseases and maintaining skin homeostasis.
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Affiliation(s)
- Kelvin Yin
- School of Biomedical Sciences, University of Queensland, Brisbane, QLD, 4072, Australia
| | - Aaron G Smith
- Dermatology Research Centre, School of Medicine, University of Queensland, Brisbane, QLD, 4072, Australia.
- School of Biomedical Science, Institute of Health and Biomedical Innovation at the Translational Research Institute, Queensland University of Technology, Woolloongabba, QLD, 4102, Australia.
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12
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Yousefi B, Samadi N, Baradaran B, Shafiei-Irannejad V, Zarghami N. Peroxisome Proliferator-Activated Receptor Ligands and Their Role in Chronic Myeloid Leukemia: Therapeutic Strategies. Chem Biol Drug Des 2016; 88:17-25. [PMID: 26841308 DOI: 10.1111/cbdd.12737] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Imatinib therapy remains the gold standard for treatment of chronic myeloid leukemia; however, the acquired resistance to this therapeutic agent in patients has urged the scientists to devise modalities for overcoming this chemoresistance. For this purpose, initially therapeutic agents with higher tyrosine kinase activity were introduced, which had the potential for inhibiting even mutant forms of Bcr-Abl. Furthermore, coupling imatinib with peroxisome proliferator-activated receptor ligands also showed beneficial effects in chronic myeloid leukemia cell proliferation. These combination protocols inhibited cell growth and induced apoptosis as well as differentiation in chronic myeloid leukemia cell lines. In addition, peroxisome proliferator-activated receptors ligands increased imatinib uptake by upregulating the expression of human organic cation transporter 1. Taken together, peroxisome proliferator-activated receptors ligands are currently being considered as novel promising therapeutic candidates for chronic myeloid leukemia treatment, because they can synergistically enhance the efficacy of imatinib. In this article, we reviewed the potential of peroxisome proliferator-activated receptors ligands for use in chronic myeloid leukemia treatment. The mechanism of action of these therapeutics modalities are also presented in detail.
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Affiliation(s)
- Bahman Yousefi
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Clinical Biochemistry and Laboratory Medicine, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.,Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Nasser Samadi
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Clinical Biochemistry and Laboratory Medicine, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Behzad Baradaran
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Vahid Shafiei-Irannejad
- Department of Clinical Biochemistry and Laboratory Medicine, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.,Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Nosratollah Zarghami
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Clinical Biochemistry and Laboratory Medicine, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
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13
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Liu M, Li X, Chen XY, Xue F, Zheng J. Topical application of a linoleic acid-ceramide containing moisturizer exhibit therapeutic and preventive benefits for psoriasis vulgaris: a randomized controlled trial. Dermatol Ther 2015; 28:373-82. [PMID: 26286610 DOI: 10.1111/dth.12259] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Min Liu
- Department of Dermatology; Ruijin Hospital, School of Medicine; Shanghai Jiao Tong University; Shanghai China
| | - Xia Li
- Department of Dermatology; Ruijin Hospital, School of Medicine; Shanghai Jiao Tong University; Shanghai China
| | - Xiao-Ying Chen
- Department of Dermatology; Ruijin Hospital, School of Medicine; Shanghai Jiao Tong University; Shanghai China
| | - Feng Xue
- Laboratory of Dermatology; Rui Jin Hospital, School of Medicine; Shanghai Jiao Tong University; Shanghai China
| | - Jie Zheng
- Department of Dermatology; Ruijin Hospital, School of Medicine; Shanghai Jiao Tong University; Shanghai China
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Gupta M, Mahajan VK, Mehta KS, Chauhan PS, Rawat R. Peroxisome proliferator-activated receptors (PPARs) and PPAR agonists: the ‘future’ in dermatology therapeutics? Arch Dermatol Res 2015; 307:767-80. [PMID: 25986745 DOI: 10.1007/s00403-015-1571-1] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 04/11/2015] [Accepted: 05/05/2015] [Indexed: 01/10/2023]
Affiliation(s)
- Mrinal Gupta
- Department of Dermatology, Venereology and Leprosy, Dr. R. P. Govt. Medical College, Kangra, Tanda, 176001, Himachal Pradesh, India
| | - Vikram K Mahajan
- Department of Dermatology, Venereology and Leprosy, Dr. R. P. Govt. Medical College, Kangra, Tanda, 176001, Himachal Pradesh, India.
| | - Karaninder S Mehta
- Department of Dermatology, Venereology and Leprosy, Dr. R. P. Govt. Medical College, Kangra, Tanda, 176001, Himachal Pradesh, India
| | - Pushpinder S Chauhan
- Department of Dermatology, Venereology and Leprosy, Dr. R. P. Govt. Medical College, Kangra, Tanda, 176001, Himachal Pradesh, India
| | - Ritu Rawat
- Department of Dermatology, Venereology and Leprosy, Dr. R. P. Govt. Medical College, Kangra, Tanda, 176001, Himachal Pradesh, India
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Winnicka K, Wroblewska M, Sosnowska K, Car H, Kasacka I. Evaluation of cationic polyamidoamine dendrimers' dermal toxicity in the rat skin model. DRUG DESIGN DEVELOPMENT AND THERAPY 2015; 9:1367-77. [PMID: 25834395 PMCID: PMC4357618 DOI: 10.2147/dddt.s78336] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Polyamidoamine (PAMAM) dendrimers are multi-branched, three-dimensional polymers with unique architecture, which makes these molecules attractive for medical and pharmaceutical applications. Using PAMAM as drug carriers for topical delivery might be beneficial as they only produce a transient effect without skin irritation. To evaluate the dermal toxicity of cationic PAMAM dendrimers generation 2 and generation 3, skin irritation studies were performed in vivo in the rat skin model. After 10 days topical application of various concentrations of PAMAM-NH2 (0.3 mg/mL, 3 mg/mL, 6 mg/mL, 30 mg/mL, 300 mg/mL), skin irritation was evaluated by visual, histopathological, and immunohistochemical examination. Microscopic assessment after hematoxylin-eosin staining revealed significant morphological changes of epidermal cells after application of PAMAM-NH2 at a concentration of ≥6 mg/mL. Morphological alterations of epidermal cells included cytoplasmic vacuolization of keratinocytes in the basal and spinous layers. Cytomorphological changes in keratinocytes, overall picture of the epidermis, and histopathological changes in the dermis were dose dependent. Detected alterations concerned hyperplasia of connective tissue fibers and leukocyte infiltration. Visible granulocyte infiltration in the upper dermis and sockets formed by necrotic, cornified cells in the hyperplastic foci of epithelium were also noted. Immunohistochemical analyses revealed that increased nuclear immunoreactivity to PCNA correlated with the concentration of PAMAM-NH2, but no significant differences in the cell proliferation activity in skin treated with PAMAM-NH2 generation 2 or generation 3 were observed. Significantly higher expression of PCNA extended throughout the skin layers might suggest abnormal cell proliferation, which, as a consequence, might even lead to neoplastic changes.
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Affiliation(s)
- Katarzyna Winnicka
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Medical University of Białystok, Białystok, Poland
| | - Magdalena Wroblewska
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Medical University of Białystok, Białystok, Poland
| | - Katarzyna Sosnowska
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Medical University of Białystok, Białystok, Poland
| | - Halina Car
- Department of Experimental Pharmacology, Faculty of Health Sciences, Medical University of Białystok, Białystok, Poland
| | - Irena Kasacka
- Department of Histology and Cytophysiology, Faculty of Pharmacy, Medical University of Białystok, Białystok, Poland
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Lima EDA, Lima MMDDA, Marques CDL, Duarte ALBP, Pita IDR, Pita MGDR. Peroxisome proliferator-activated receptor agonists (PPARs): a promising prospect in the treatment of psoriasis and psoriatic arthritis. An Bras Dermatol 2014; 88:1029-35. [PMID: 24474126 PMCID: PMC3900368 DOI: 10.1590/abd1806-4841.20132653] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 04/24/2013] [Indexed: 01/04/2023] Open
Abstract
Psoriasis is a polygenic, inflammatory and progressive disease, characterized by an
abnormal differentiation and hyperproliferation of keratinocytes, associated with
impaired immunologic activation and systemic disorders, while psoriatic arthritis is
a chronic inflammatory articular disease. Pathophysiology of psoriasis comprises a
dysfunction of the immune system cells with an interactive network between cells and
cytokines supporting the initiation and perpetuation of disease and leading to
inflammation of skin, enthesis and joints. Recent studies have shown an important
role of systemic inflammation in the development of atherosclerosis. Corroborating
these findings, patients with severe Psoriasis have marked incidence of psoriatic
arthritis, cardiovascular diseases, hypertension, dyslipidemia, obesity and diabetes
mellitus, showing an increased risk for acute myocardial infarction, which suggests
that the condition is not restricted to the skin. Nuclear receptors are
ligand-dependent transcription factors, whose activation affects genes that control
vital processes. Among them the peroxisome proliferator-activated receptor is
responsible for establishing the relationship between lipids, metabolic diseases and
innate immunity. In the skin, peroxisome proliferator-activated receptors have an
important effect in keratinocyte homeostasis, suggesting a role in diseases such as
psoriasis. The peroxisome proliferator-activated receptors agonists represent a
relevant source of research in the treatment of skin conditions, however more
clinical studies are needed to define the potential response of these drugs in
patients with psoriasis and psoriatic arthritis.
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Affiliation(s)
- Emerson de Andrade Lima
- São Paulo University, MD, PhD in Dermatology at São Paulo University (USP) - Preceptor of the Dermatology Post-Graduation Program at Santa Casa de Misericórdia do Recife - Recife (PE), Brazil
| | - Mariana Modesto Dantas de Andrade Lima
- Pernambuco Federal University, RecifePE, Brazil, MD, Board certified dermatologist - Preceptor at Pernambuco Federal University (UFPE) - Recife (PE), Brazil
| | - Cláudia Diniz Lopes Marques
- Pernambuco Federal University, RecifePE, Brazil, MD, PhD - Adjunct Professor of Rheumatology at Pernambuco Federal University (UFPE) - Recife (PE), Brazil
| | - Angela Luzia Branco Pinto Duarte
- Pernambuco Federal University, RecifePE, Brazil, MD, PhD - Full Professor of Rheumatology at Pernambuco Federal University (UFPE) - Recife (PE), Brazil
| | - Ivan da Rocha Pita
- Pernambuco Federal University, RecifePE, Brazil, MD, PhD, Post-doctorate - Full Professor of Rheumatology at Pernambuco Federal University (UFPE) - Recife (PE), Brazil
| | - Maira Galdino da Rocha Pita
- Biochemistry Department, Pernambuco Federal University, RecifePE, Brazil, Post-doctorate - Adjunct Professor Level II at the Biochemistry Department at Pernambuco Federal University (UFPE) - Recife (PE), Brazil
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Man G, Mauro TM, Kim PL, Hupe M, Zhai Y, Sun R, Crumrine D, Cheung C, Nuno-Gonzalez A, Elias PM, Man MQ. Topical hesperidin prevents glucocorticoid-induced abnormalities in epidermal barrier function in murine skin. Exp Dermatol 2014; 23:645-51. [PMID: 24980072 DOI: 10.1111/exd.12480] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/19/2014] [Indexed: 12/11/2022]
Abstract
Systemic and topical glucocorticoids (GC) can cause significant adverse effects not only on the dermis, but also on epidermal structure and function. In epidermis, a striking GC-induced alteration in permeability barrier function occurs that can be attributed to an inhibition of epidermal mitogenesis, differentiation and lipid production. As prior studies in normal hairless mice demonstrated that topical applications of a flavonoid ingredient found in citrus, hesperidin, improve epidermal barrier function by stimulating epidermal proliferation and differentiation, we assessed here whether its topical applications could prevent GC-induced changes in epidermal function in murine skin and the basis for such effects. When hairless mice were co-treated topically with GC and 2% hesperidin twice-daily for 9 days, hesperidin co-applications prevented the expected GC-induced impairments of epidermal permeability barrier homoeostasis and stratum corneum (SC) acidification. These preventive effects could be attributed to a significant increase in filaggrin expression, enhanced epidermal β-glucocerebrosidase activity and accelerated lamellar bilayer maturation, the last two likely attributable to a hesperidin-induced reduction in stratum corneum pH. Furthermore, co-applications of hesperidin with GC largely prevented the expected GC-induced inhibition of epidermal proliferation. Finally, topical hesperidin increased epidermal glutathione reductase mRNA expression, which could counteract multiple functional negative effects of GC on epidermis. Together, these results show that topical hesperidin prevents GC-induced epidermal side effects by divergent mechanisms.
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Affiliation(s)
- George Man
- Dermatology Service, Veterans Affairs Medical Center, and Department of Dermatology, University of California San Francisco, San Francisco, CA, USA
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Bourguignon LYW, Wong G, Xia W, Man MQ, Holleran WM, Elias PM. Selective matrix (hyaluronan) interaction with CD44 and RhoGTPase signaling promotes keratinocyte functions and overcomes age-related epidermal dysfunction. J Dermatol Sci 2013; 72:32-44. [PMID: 23790635 PMCID: PMC3775883 DOI: 10.1016/j.jdermsci.2013.05.003] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Revised: 05/18/2013] [Accepted: 05/21/2013] [Indexed: 01/04/2023]
Abstract
BACKGROUND Mouse epidermal chronologic aging is closely associated with aberrant matrix (hyaluronan, HA)-size distribution/production and impaired keratinocyte proliferation/differentiation, leading to a marked thinning of the epidermis with functional consequence that causes a slower recovery of permeability barrier function. OBJECTIVE The goal of this study is to demonstrate mechanism-based, corrective therapeutic strategies using topical applications of small HA (HAS) and/or large HA (HAL) [or a sequential small HA (HAS) and large HA(HAL) (HAs→HAL) treatment] as well as RhoGTPase signaling perturbation agents to regulate HA/CD44-mediated signaling, thereby restoring normal epidermal function, and permeability barrier homeostasis in aged mouse skin. METHODS A number of biochemical, cell biological/molecular, pharmacological and physiological approaches were used to investigate matrix HA-CD44-mediated RhoGTPase signaling in regulating epidermal functions and skin aging. RESULTS In this study we demonstrated that topical application of small HA (HAS) promotes keratinocyte proliferation and increases skin thickness, while it fails to upregulate keratinocyte differentiation or permeability barrier repair in aged mouse skin. In contrast, large HA (HAL) induces only minimal changes in keratinocyte proliferation and skin thickness, but restores keratinocyte differentiation and improves permeability barrier function in aged epidermis. Since neither HAS nor HAL corrects these epidermal defects in aged CD44 knock-out mice, CD44 likely mediates HA-associated epidermal functions in aged mouse skin. Finally, blockade of Rho-kinase activity with Y27632 or protein kinase-Nγ activity with Ro31-8220 significantly decreased the HA (HAS or HAL)-mediated changes in epidermal function in aged mouse skin. CONCLUSION The results of our study show first that HA application of different sizes regulates epidermal proliferation, differentiation and barrier function in aged mouse skin. Second, manipulation of matrix (HA) interaction with CD44 and RhoGTPase signaling could provide further novel therapeutic approaches that could be targeted for the treatment of various aging-related skin disorders.
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Affiliation(s)
- Lilly Y W Bourguignon
- Department of Medicine, University of California San Francisco and VA Medical Center, United States.
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Lin TK, Man MQ, Santiago JL, Park K, Roelandt T, Oda Y, Hupe M, Crumrine D, Lee HJ, Gschwandtner M, Thyssen JP, Trullas C, Tschachler E, Feingold KR, Elias PM. Topical antihistamines display potent anti-inflammatory activity linked in part to enhanced permeability barrier function. J Invest Dermatol 2012; 133:469-78. [PMID: 23014339 PMCID: PMC3532566 DOI: 10.1038/jid.2012.335] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Systemic antagonists of the histamine type 1 and 2 receptors (H1/2r) are widely used as anti-pruritics and central sedatives, but demonstrate only modest anti-inflammatory activity. Because many inflammatory dermatoses result from defects in cutaneous barrier function, and because keratinocytes express both Hr1 and Hr2, we hypothesized that H1/2r antagonists might be more effective, if they were used topically to treat inflammatory dermatoses. Topical H1/2r antagonists additively enhanced permeability barrier homeostasis in normal mouse skin by: i) stimulation of epidermal differentiation, leading to thickened cornified envelopes; and ii) enhanced epidermal lipid synthesis and secretion. Since barrier homeostasis was enhanced to a comparable extent in mast cell-deficient mice, with no further improvement following application of topical H1/2r antagonists, H1/2r antagonists likely oppose mast cell-derived histamine. In four immunologically-diverse, murine disease models, characterized by either inflammation alone (acute irritant contact dermatitis, acute allergic contact dermatitis), or by prominent barrier abnormalities (subacute allergic contact dermatitis, atopic dermatitis), topical H1/2r agonists aggravated, while H1/2r antagonists improved inflammation and/or barrier function. The apparent ability of topical H1r/2r antagonists to target epidermal H1/2r could translate into increased efficacy in the treatment of inflammatory dermatoses, likely due to decreased inflammation and enhanced barrier function. These results could shift current paradigms of antihistamine utilization from a predominantly-systemic to a topical approach.
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Affiliation(s)
- Tzu-Kai Lin
- Dermatology Service, Department of Veterans Affairs Medical Center, and Department of Dermatology, UCSF, San Francisco, California 94121, USA
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Poiraud C, Quereux G, Knol AC, Allix R, Khammari A, Dreno B. Zinc gluconate is an agonist of peroxisome proliferator-activated receptor-α in the epidermis. Exp Dermatol 2012; 21:347-51. [DOI: 10.1111/j.1600-0625.2012.01467.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Meissner M, Berlinski B, Gille J, Doll M, Kaufmann R. Peroxisome proliferator activated receptor-α agonists suppress transforming growth factor-α-induced matrix metalloproteinase-9 expression in human keratinocytes. Clin Exp Dermatol 2011; 36:911-4. [PMID: 21790722 DOI: 10.1111/j.1365-2230.2011.04125.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The peroxisome proliferator-activated receptors (PPARs), PPARα, PPARδ, and PPARγ, are nuclear ligand-activated transcription factors that are best known as regulators of glucose and lipid metabolism. PPARα agonists have been shown to have profound anti-inflammatory and antiproliferative effects on human keratinocytes, and are important for maintaining homeostasis of the skin. To better characterize the mechanisms underlying these phenomena, we analysed the effects of PPARα agonists on transforming growth factor (TGF)-α-induced expression of matrix metalloproteinase (MMP)-9. MMP-9 expression in keratinocytes has previously been linked to inflammatory skin diseases, regenerative skin mechanisms, and tumour development and metastasis. We found that PPARα agonists effectively inhibited TGF-α-induced MMP-9 expression in human keratinocytes via a post-transcriptional mechanism, revealing a novel and important aspect of the anti-inflammatory and anticarcinogenic action of these compounds.
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Affiliation(s)
- M Meissner
- Department of Dermatology, Johann Wolfgang Goethe-University, Frankfurt am Main, Germany.
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Abstract
Peroxisome proliferators-activated receptors (PPARs) that are members of the nuclear receptor superfamily have three different isoforms: PPARalpha, PPARdelta, and PPARgamma. PPARs are ligand-activated transcription factors, and they are implicated in tumor progression, differentiation, and apoptosis. Activation of PPAR isoforms lead to both anticarcinogenesis and anti-inflammatory effect. It has so far identified many PPAR ligands including chemical composition and natural occurring. PPAR ligands are reported to activate PPAR signaling and exert cancer prevention and treatment in vitro and/or in vivo studies. Although the effects depend on the isoforms and the types of ligands, biological modulatory activities of PPARs in carcinogenesis and disease progression are attracted for control or combat cancer development. This short review summarizes currently available data on the role of PPAR ligands in carcinogenesis.
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Hatano Y, Elias PM, Crumrine D, Feingold KR, Katagiri K, Fujiwara S. Efficacy of combined peroxisome proliferator-activated receptor-α ligand and glucocorticoid therapy in a murine model of atopic dermatitis. J Invest Dermatol 2011; 131:1845-52. [PMID: 21633371 PMCID: PMC3156961 DOI: 10.1038/jid.2011.144] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Although topical glucocorticoids (GCs) display potent anti-inflammatory activity in inflamed skin, they also can exert numerous harmful effects on epidermal structure and function. In contrast, topical applications of ligands of peroxisome proliferator-activated receptor-α (PPARα) not only reduce inflammation, and also improve cutaneous barrier homeostasis. Therefore, we examined whether sequential topical GCs followed by topical Wy14643 (a ligand of PPARα) might be more effective than either alone for atopic dermatitis (AD) in a hapten (oxazolone)-induced, murine model with multiple features of AD (Ox-AD). Despite expected anti-inflammatory benefits, topical GC alone induced: i) epidermal thinning; ii) reduced expression of involucrin, loricrin and filaggrin; and iii) allowed outside-to-inside penetration of an epicutaneous tracer. While Wy14643 alone yielded significant therapeutic benefits in mice with mild or moderate Ox-AD, it was less effective in severe Ox-AD. Yet, topical applications of Wy14643 after GC was not only significantly effective comparable to GC alone, but it also prevented GC-induced structural and functional abnormalities in permeability barrier homeostasis. Moreover, rebound flares were largely absent after sequential treatment with GC and Wy14643. Together, these results show that GC and PPARα ligand therapy together is not only effective but also prevents development of GC-induced side effects, including rebound flares, in murine AD.
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Affiliation(s)
- Yutaka Hatano
- Department of Dermatology, Faculty of Medicine, Oita University, Yufu-shi, Oita, Japan.
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Dubrac S, Schmuth M. PPAR-alpha in cutaneous inflammation. DERMATO-ENDOCRINOLOGY 2011; 3:23-6. [PMID: 21519405 PMCID: PMC3051849 DOI: 10.4161/derm.3.1.14615] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2010] [Accepted: 12/21/2010] [Indexed: 12/20/2022]
Abstract
Peroxisome proliferator-activated receptor (PPAR)-alpha is a fatty acid activated transcription factors that belongs to the nuclear hormone receptor family. Primarily PPAR-alpha serves as a lipid sensor. While PPAR-alpha controls enzymes from the lipid and glucose metabolism in the liver, heart and muscles, PPAR-alpha is also involved in skin homeostasis. PPAR-alpha controls keratinocyte proliferation/differentiation, contributes to wound healing and regulates skin inflammation. PPAR-alpha activation exerts anti-inflammatory effects in various skin conditions such as irritant and allergic contact dermatitis, atopic dermatitis and UV-induced erythema, rendering investigations into the functions of PPAR-alpha necessary to provide better understandings to treat many inflammatory skin disorders.
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Affiliation(s)
- Sandrine Dubrac
- Molecular Biology Laboratory; Department of Dermatology; Innsbruck Medical University; Innsbruck Austria
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De Belilovsky C, Roo-Rodriguez E, Baudouin C, Menu F, Chadoutaud B, Msika P. Natural peroxisome proliferator-activated receptor-alpha agonist cream demonstrates similar therapeutic response to topical steroids in atopic dermatitis. J DERMATOL TREAT 2010; 22:359-65. [PMID: 20964572 DOI: 10.3109/09546634.2010.499932] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
BACKGROUND Atopic dermatitis (AD) requires permanent skin care. OBJECTIVE A cream containing 2% SO (sunflower oleodistillate), with peroxisome proliferator-activated receptor-alpha (PPAR-α) agonist properties, has been compared to a topical steroid (hydrocortisone butyro-propionate 1 mg/g). METHODS An open, randomized study included two groups of 40 children (aged 3 months to 4 years). Group A applied the steroid and group B applied the 2% SO cream, twice a day. SCORAD (SCORing Atopic Dermatitis) was determined at D0, D7 and D21 and quality of life (QoL) at D0 and D21. RESULTS SCORAD was similar at D0 (37.2 versus 36.9), D7 (18.9 versus 19.2) (-49% and -48%) and D21 (11 versus 9.4) (-70% and -75%) (p < 0.01 versus D0). The Infant Dermatitis Quality of Life and Dermatitis Family Impact Questionnaire improved similarly by 65%/67% in group A and 72%/75% in group B at D21 (p < 0.01 versus D0). CONCLUSION A 2% SO cream has demonstrated therapeutic properties, using clinical scores and QoL, comparable to those of a topical steroid.
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McCusker MM, Grant-Kels JM. Healing fats of the skin: the structural and immunologic roles of the omega-6 and omega-3 fatty acids. Clin Dermatol 2010; 28:440-51. [PMID: 20620762 DOI: 10.1016/j.clindermatol.2010.03.020] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Linoleic acid (18:2omega6) and alpha-linolenic acid (18:3omega3) represent the parent fats of the two main classes of polyunsaturated fatty acids: the omega-6 (n-6) and the omega-3 (n-3) fatty acids, respectively. Linoleic acid and alpha-linolenic acid both give rise to other long-chain fatty acid derivatives, including gamma-linolenic acid and arachidonic acid (omega-6 fatty acids) and docosahexaenoic acid and eicosapentaenoic acid (omega-3 fatty acids). These fatty acids are showing promise as safe adjunctive treatments for many skin disorders, including atopic dermatitis, psoriasis, acne vulgaris, systemic lupus erythematosus, nonmelanoma skin cancer, and melanoma. Their roles are diverse and include maintenance of the stratum corneum permeability barrier, maturation and differentiation of the stratum corneum, formation and secretion of lamellar bodies, inhibition of proinflammatory eicosanoids, elevation of the sunburn threshold, inhibition of proinflammatory cytokines (tumor necrosis factor-alpha, interferon-gamma, and interleukin-12), inhibition of lipoxygenase, promotion of wound healing, and promotion of apoptosis in malignant cells, including melanoma. They fulfill these functions independently and through the modulation of peroxisome proliferator-activated receptors and Toll-like receptors.
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Affiliation(s)
- Meagen M McCusker
- Department of Dermatology University of Connecticut Health Center, 263 Farmington Avenue, MC 6230, Farmington, CT 06030, USA
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O'Shaughnessy RF, Choudhary I, Harper JI. Interleukin-1 alpha blockade prevents hyperkeratosis in an in vitro model of lamellar ichthyosis. Hum Mol Genet 2010; 19:2594-605. [DOI: 10.1093/hmg/ddq145] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Kim EJ, Jin XJ, Kim YK, Oh IK, Kim JE, Park CH, Chung JH. UV decreases the synthesis of free fatty acids and triglycerides in the epidermis of human skin in vivo, contributing to development of skin photoaging. J Dermatol Sci 2009; 57:19-26. [PMID: 19932008 DOI: 10.1016/j.jdermsci.2009.10.008] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2009] [Revised: 10/06/2009] [Accepted: 10/19/2009] [Indexed: 11/16/2022]
Abstract
BACKGROUND Although fatty acids are known to be important in various skin functions, their roles on photoaging in human skin are poorly understood. OBJECTIVE We investigated the alteration of lipid metabolism in the epidermis by photoaging and acute UV irradiation in human skin. METHODS UV irradiated young volunteers (21-33 years, n=6) and elderly volunteers (70-75 years, n=7) skin samples were obtained by punch biopsy. Then the epidermis was separated from dermis and lipid metabolism was investigated. RESULTS We observed that the amounts of free fatty acids (FFA) and triglycerides (TG) in the epidermis of photoaged or acutely UV irradiated human skin were significantly decreased. The expressions of genes related to lipid synthesis, including acetyl-CoA carboxylase (ACC), fatty acid synthase (FAS), stearoyl-CoA desaturase (SCD), sterol regulatory element binding proteins (SREBPs), and peroxisome proliferator-activated receptors (PPARgamma) were also markedly decreased. To elucidate the significance of these changes of epidermal lipids in human skin, we investigated the effects of TG or various inhibitors for the enzymes involved in TG synthesis on the expression of matrix metalloproteinase-1 (MMP-1) in cultured human epidermal keratinocytes. We demonstrated that triolein (TG) reduced basal and UV-induced MMP-1 mRNA expression. In addition, each inhibitor for various lipid synthesis enzymes, such as TOFA (ACC inhibitor), cerulenin (FAS inhibitor) and trans-10, cis-12-CLA (SCD inhibitor), increased the MMP-1 expression significantly in a dose-dependent manner. We also demonstrated that triolein could inhibit cerulenin-induced MMP-1 expression. Furthermore, topical application of triolein (10%) significantly prevented UV-induced MMP-13, COX-2, and IL-1beta expression in hairless mice. CONCLUSION Our results suggest that TG and FFA may play important roles in photoaging of human skin.
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Affiliation(s)
- Eun Ju Kim
- Department of Dermatology, Seoul National University College of Medicine, Seoul, Republic of Korea
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29
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Hatano Y, Man MQ, Uchida Y, Crumrine D, Mauro TM, Feingold KR, Elias PM, Holleran WM. Murine atopic dermatitis responds to peroxisome proliferator-activated receptors alpha and beta/delta (but not gamma) and liver X receptor activators. J Allergy Clin Immunol 2009; 125:160-9.e1-5. [PMID: 19818482 DOI: 10.1016/j.jaci.2009.06.049] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2009] [Revised: 06/19/2009] [Accepted: 06/29/2009] [Indexed: 12/22/2022]
Abstract
BACKGROUND Atopic dermatitis (AD) is a chronic inflammatory dermatosis now increasingly linked to mutations that alter the structure and function of the stratum corneum. Activators of peroxisome proliferator-activated receptors (PPARs) alpha, beta/delta, and gamma and liver X receptor (LXR) regulate epidermal protein and lipid production, leading to superior barrier function. Additionally, some of these activators exhibit potent antihyperplastic and anti-inflammatory activity in irritant contact dermatitis and acute allergic contact dermatitis murine models. OBJECTIVE We evaluated the efficacy of PPAR/LXR activation in a hapten (oxazolone [Ox])-induced AD-like model (Ox-AD) in hairless mice. METHODS Ox-AD was established with 10 Ox challenges (every other day) on the flank. After the establishment of Ox-AD, twice-daily topical application with individual PPAR/LXR activators was then performed for 4 days, with continued Ox challenges every other day. The efficacy of topical PPAR/LXR activators to reduce parameters of Ox-AD was assessed physiologically, morphologically, and immunologically. RESULTS Certain topical activators of PPARalpha, PPARbeta/delta, and LXR, but not activators of PPARgamma, reversed the clinical dermatosis, significantly improved barrier function, and increased stratum corneum hydration in Ox-AD mice. In addition, the same activators, but again not PPARgamma, largely reversed the immunologic abnormalities in Ox-AD mice, including the increased T(H)2 markers, such as tissue eosinophil/mast cell density, serum thymus and activation-related chemokine levels, the density of chemoattractant receptor-homologous molecule expressed on T(H)2-positive lymphocytes (but not serum IgE levels), and reduced IL-1alpha and TNF-alpha activation, despite ongoing hapten challenges. CONCLUSION These results suggest that topical applications of certain activators/ligands of PPARalpha, PPARbeta/delta, and LXR could be useful for the treatment of AD in human subjects.
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Affiliation(s)
- Yutaka Hatano
- Dermatology Service, Veterans Affairs Medical Center, University of California, San Francisco, CA, USA
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Jiang YJ, Lu B, Crumrine D, Elias PM, Feingold KR. IL-6 Stimulates but is not essential for stratum corneum formation and permeability barrier development during gestation. Exp Dermatol 2009; 19:e31-6. [DOI: 10.1111/j.1600-0625.2009.00968.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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IL-1α accelerates stratum corneum formation and improves permeability barrier homeostasis during murine fetal development. J Dermatol Sci 2009; 54:88-98. [DOI: 10.1016/j.jdermsci.2009.01.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2008] [Revised: 01/05/2009] [Accepted: 01/08/2009] [Indexed: 11/18/2022]
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Valentin S, Rudolph J, Goertz O, Botteck N, Langer S, Schneider S. Effect of fenofibrate on microcirculation and wound healing in healthy and diabetic mice. Eur J Med Res 2009; 14:65-70. [PMID: 19258215 PMCID: PMC3351962 DOI: 10.1186/2047-783x-14-2-65] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Objective Disturbances in wound healing in patients with hyperglycaemic blood sugar values are a common clinical problem. Recent studies identified PPARα-ligands as potential skin therapeutic agents. The aim of this study was to investigate the effects of oral fenofibrate treatment on dermal wound healing and micro-circulatory parameters in diabetic mice. Methods Dermal wounds were created in CD-1 mice. Mice were randomized into four treatment groups: diabetic mice treated (dbf) or not-treated with fenofibrate (dbnf). As controls served non-diabetic mice treated (ndf) or not-treated with fenofibrate (ndnf). At various points in time microcirculation was analyzed by intravital fluorescent microscopy to determine wound surface area, vessel diameter, plasma leakage, functional capillary density, and leukocyte/endothelium interaction. Results The dbf-mice showed a significantly increased diameter of the venules and the arterioles up to 3 days after wound creation compared to dbnf-mice. However, wound healing was not improved in dbf-compared to dbnf-mice. Surprisingly, all microcirculatory parameter (vessel diameter, plasma leakage and functional capillary density) were not deteriorated in dbnf-compared to ndnf-mice. Conclusion We confirm that high blood sugar values lead to a delayed wound healing, but this could not traced back to altered microcirculatory patterns. Furthermore, in dbf-mice an improved vasodilatatory function of small vessels could be detected, but with no substantial effect on wound healing. Further studies are needed to clarify, if topical application of fenofibrate might be beneficial.
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Affiliation(s)
- S Valentin
- Medical Department 1, University Hospital Bergmannsheil, University of Bochum, Germany
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The Role of PPARs in the Endothelium: Implications for Cancer Therapy. PPAR Res 2008; 2008:904251. [PMID: 19043612 PMCID: PMC2586817 DOI: 10.1155/2008/904251] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2008] [Revised: 07/28/2008] [Accepted: 09/09/2008] [Indexed: 12/18/2022] Open
Abstract
The growth and metastasis of cancers intimately involve the vasculature and in particular the endothelial cell layer. Tumours require new blood vessel formation via angiogenesis to support growth. In addition, inflammation, coagulation, and platelet activation are common signals in the growth and metastasis of tumour cells. The endothelium plays a central role in the homeostatic control of inflammatory cell recruitment, regulating platelet activation and coagulation pathways. PPARalpha, -beta/delta, and -gamma are all expressed in endothelial cells. This review will discuss the roles of PPARs in endothelial cells in relation to angiogenesis, inflammation, coagulation, and platelet control pathways. In particular, we will discuss the recent evidence that supports the hypothesis that PPARalpha and PPARgamma are antiangiogenic receptors, while PPARbeta/delta is proangiogenic.
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Elias PM, Arbiser J, Brown BE, Rossiter H, Man MQ, Cerimele F, Crumrine D, Gunathilake R, Choi EH, Uchida Y, Tschachler E, Feingold KR. Epidermal vascular endothelial growth factor production is required for permeability barrier homeostasis, dermal angiogenesis, and the development of epidermal hyperplasia: implications for the pathogenesis of psoriasis. THE AMERICAN JOURNAL OF PATHOLOGY 2008; 173:689-99. [PMID: 18688025 DOI: 10.2353/ajpath.2008.080088] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Primary abnormalities in permeability barrier function appear to underlie atopic dermatitis and epidermal trauma; a concomitant barrier dysfunction could also drive other inflammatory dermatoses, including psoriasis. Central to this outside-inside view of disease pathogenesis is the epidermal generation of cytokines/growth factors, which in turn signal downstream epidermal repair mechanisms. Yet, this cascade, if sustained, signals downstream epidermal hyperplasia and inflammation. We found here that acute barrier disruption rapidly stimulates mRNA and protein expression of epidermal vascular endothelial growth factor-A (VEGF-A) in normal hairless mice, a specific response to permeability barrier requirements because up-regulation is blocked by application of a vapor-impermeable membrane. Moreover, epidermal vegf(-/-) mice display abnormal permeability barrier homeostasis, attributable to decreased VEGF signaling of epidermal lamellar body production; a paucity of dermal capillaries with reduced vascular permeability; and neither angiogenesis nor epidermal hyperplasia in response to repeated tape stripping (a model of psoriasiform hyperplasia). These results support a central role for epidermal VEGF in the maintenance of epidermal permeability barrier homeostasis and a link between epidermal VEGF production and both dermal angiogenesis and the development of epidermal hyperplasia. Because psoriasis is commonly induced by external trauma [isomorphic (Koebner) phenomenon] and is associated with a prominent permeability barrier abnormality, excess VEGF production, prominent angiogenesis, and epidermal hyperplasia, these results could provide a potential outside-inside mechanistic basis for the development of psoriasis.
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Affiliation(s)
- Peter M Elias
- Dermatology Service (190), VA Medical Center, 4150 Clement St., San Francisco, CA 94121, USA.
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Man MQ, Shi Y, Man M, Lee SH, Demerjian M, Chang S, Feingold KR, Elias PM. Chinese herbal medicine (Tuhuai extract) exhibits topical anti-proliferative and anti-inflammatory activity in murine disease models. Exp Dermatol 2008; 17:681-7. [PMID: 18341576 PMCID: PMC2843409 DOI: 10.1111/j.1600-0625.2007.00690.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
While psoriasis is one of the most common skin disorders in humans, effective, safe and inexpensive treatments are still largely unavailable. Chinese herbal medicine (CHM) has been used for centuries for treating psoriasis and several reports claim that systemic administration of one such CHM, Tuhuai, mainly composed of flos sophorae, smilax glabra roxb and licorice, is effective in psoriasis. However, the mechanisms by which this CHM improves psoriasis are not yet clear. Two universal features of psoriasis are epidermal hyperplasia and inflammation. Moreover, drugs that specifically inhibit epidermal hyperplasia and/or inflammation are widely used to treat psoriasis. Here, we investigated whether topical applications of Tuhuai extract exhibit anti-proliferative and anti-inflammatory activities in two murine models of inflammatory dermatoses. To assess Tuhuai's potential anti-proliferative effect, we disrupted epidermal barrier function twice-daily for 4 days in normal hairless mice followed by topical applications of either 1% Tuhuai extract or Vehicle to both flanks immediately after each barrier perturbation. Changes in epidermal proliferation and apoptosis were evaluated by immunohistochemistry and TUNEL staining. To assess the anti-inflammatory effects of Tuhuai, both irritant (phorbol ester) and acute allergic contact dermatitis (oxazolone) models were used. Whereas topical Tuhuai extract did not alter epidermal proliferation or induce irritation in normal skin, it both reduced epidermal hyperplasia in the epidermal hyperproliferative model, and reduced inflammation in both irritant and allergic contact dermatitis models. As topical Tuhuai extract exhibits anti-proliferative and anti-inflammatory properties in a variety of human models of inflammatory dermatoses, Tuhuai could provide an effective, relatively safe and inexpensive therapeutic alternative for the treatment of inflammatory dermatoses, including psoriasis.
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Affiliation(s)
- Mao-Qiang Man
- Dalian Skin Disease Hospital, Liaoning, China
- Department of Dermatology, University of California, San Francisco, CA, USA
| | - Yuejun Shi
- Dalian Skin Disease Hospital, Liaoning, China
| | - Mona Man
- Department of Dermatology, University of California, San Francisco, CA, USA
| | - Seung Hun Lee
- Department of Dermatology, Yonsei University School of Medicine, Yonsei, Korea
| | - Marianne Demerjian
- Department of Dermatology, University of California, San Francisco, CA, USA
| | - Sandra Chang
- Department of Dermatology, University of California, San Francisco, CA, USA
| | | | - Peter M. Elias
- Department of Dermatology, University of California, San Francisco, CA, USA
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Sertznig P, Seifert M, Tilgen W, Reichrath J. Peroxisome proliferator-activated receptors (PPARs) and the human skin: importance of PPARs in skin physiology and dermatologic diseases. Am J Clin Dermatol 2008; 9:15-31. [PMID: 18092840 DOI: 10.2165/00128071-200809010-00002] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Peroxisome proliferator-activated receptors (PPARs) are members of the nuclear receptor superfamily that regulate lipid, glucose, and amino acid metabolism. More recently, PPARs and corresponding ligands have been shown in skin and other organs to regulate important cellular functions, including cell proliferation and differentiation, as well as inflammatory responses. These new functions identify PPARs and corresponding ligands as potential targets for the treatment of various skin diseases and other disorders. It has been shown that in inflammatory skin disorders, including hyperproliferative psoriatic epidermis and the skin of patients with atopic dermatitis, the expression of both PPARalpha and PPARgamma is decreased. This observation suggests the possibility that PPARalpha and PPARgamma activators, or compounds that positively regulate PPAR gene expression, may represent novel NSAIDs for the topical or systemic treatment of common inflammatory skin diseases such as atopic dermatitis, psoriasis, and allergic contact dermatitis. Moreover, recent findings indicate that PPAR-signaling pathways may act as a promising therapeutic target for the treatment of hyperproliferative skin diseases including skin malignancies. Studies in non-diabetic patients suggest that oral thiazolidinediones, which are synthetic ligands of PPARgamma, not only exert an antidiabetic effect but also may be beneficial for moderate chronic plaque psoriasis by suppressing proliferation and inducing differentiation of keratinocytes; furthermore, they may even induce cell growth arrest, apoptosis, and terminal differentiation in various human malignant tumors. It has been reported that PPARalpha immunoreactivity is reduced in human keratinocytes of squamous cell carcinoma (SCC) and actinic keratosis (AK), while PPARdelta appears to be upregulated. Additionally, the microvessel density is significantly higher in AK and SCC that express high levels of PPARdelta. PPARdelta has been demonstrated to have an anti-apoptotic role and to maintain survival and differentiation of epithelial cells, whereas PPARalpha and PPARgamma activators induce differentiation and inhibit proliferation and regulate apoptosis. In melanoma, the growth inhibitory effect of PPARgamma activation is independent of apoptosis and seems to occur primarily through induction of cell cycle arrest in the G1 phase of the cell cycle or induction of re-differentiation. PPARalpha activation causes inhibition of migration of melanoma cells and anchorage-independent growth, whereas primary tumor growth remains unaltered. In clinical trials of gemfibrozil, a PPARalpha ligand, significantly fewer patients treated with this lipid-lowering drug were diagnosed with melanoma as compared to those in the control group. In conclusion, an increasing body of evidence indicates that PPAR signaling pathways may represent interesting therapeutic targets for a broad variety of skin disorders, including inflammatory skin diseases such as psoriasis and atopic dermatitis, and skin malignancies.
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Affiliation(s)
- Pit Sertznig
- Department of Dermatology, The Saarland University Hospital, Homburg/Saar, Germany
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Schmuth M, Jiang YJ, Dubrac S, Elias PM, Feingold KR. Thematic review series: skin lipids. Peroxisome proliferator-activated receptors and liver X receptors in epidermal biology. J Lipid Res 2008; 49:499-509. [PMID: 18182682 DOI: 10.1194/jlr.r800001-jlr200] [Citation(s) in RCA: 148] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The epidermis is a very active site of lipid metabolism, and all peroxisome proliferator-activated receptor (PPAR) and liver X receptor (LXR) isoforms are expressed in the epidermis. Activation of PPARalpha, -beta/delta, or -gamma or LXRs stimulates keratinocyte differentiation. Additionally, activation of these receptors also improves permeability barrier homeostasis by a number of mechanisms, including stimulating epidermal lipid synthesis, increasing lamellar body formation and secretion, and increasing the activity of enzymes required for the extracellular processing of lipids in the stratum corneum, leading to the formation of lamellar membranes that mediate permeability barrier function. The stimulation of keratinocyte differentiation and permeability barrier formation also occurs during fetal development, resulting in accelerated epidermal development. PPAR and LXR activation regulates keratinocyte proliferation and apoptosis, and studies have shown that these receptors play a role in cutaneous carcinogenesis. Lastly, PPAR and LXR activation is anti-inflammatory, reducing inflammation in animal models of allergic and irritant contact dermatitis. Because of their broad profile of beneficial effects on skin homeostasis, PPAR and LXR have great potential to serve as drug targets for common skin diseases such as psoriasis, atopic dermatitis, and skin cancer.
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Affiliation(s)
- Matthias Schmuth
- Department of Dermatology, University of California, San Francisco, CA, USA.
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Jiang YJ, Lu B, Kim P, Paragh G, Schmitz G, Elias PM, Feingold KR. PPAR and LXR Activators Regulate ABCA12 Expression in Human Keratinocytes. J Invest Dermatol 2008; 128:104-9. [PMID: 17611579 DOI: 10.1038/sj.jid.5700944] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
ATP-binding cassette (ABC) transporter, family 12 (ABCA12), a member of the ABC superfamily, facilitates the delivery of lipids to lamellar bodies (LB) in keratinocytes, which is critical for permeability barrier function. Recently, gene mutations of ABCA12 were found to underlie Harlequin ichthyosis and lamellar ichthyosis, two devastating skin disorders. Previously we and others have demonstrated that peroxisome proliferators-activated receptors (PPARs) and liver X receptor (LXR) activation improved epidermal permeability barrier homeostasis by stimulating keratinocyte differentiation, lipid synthesis, and increasing LB formation/secretion. Here we report that both PPAR-gamma and -beta/delta activators markedly stimulate ABCA12 mRNA expression in cultured human keratinocyte (CHK) in a dose- and time-dependent manner. Increased ABCA12 mRNA levels are accompanied by an increase in ABCA12 protein, suggesting biological importance of this upregulation. LXR activators also increase ABCA12 mRNA levels in CHK, but to a lesser extent. In contrast, activators of PPAR-alpha, RAR, RXR, or vitamin D receptor did not alter ABCA12 expression. Two major ABCA12 alternative transcripts and their corresponding proteins are also expressed and upregulated by PPAR or LXR activator in both undifferentiated and differentiated CHK. Together, our data demonstrate that PPAR and LXR activators increase ABCA12 expression, providing an additional mechanism by which PPAR and LXR activators promote epidermal permeability barrier homeostasis.
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Affiliation(s)
- Yan J Jiang
- Metabolism Section, Department of Veterans Affairs Medical Center, Northern California Institute for Research and Education, University of California at San Francisco, San Francisco, California 94121, USA.
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Man MQ, Barish GD, Schmuth M, Crumrine D, Barak Y, Chang S, Jiang Y, Evans RM, Elias PM, Feingold KR. Deficiency of PPARbeta/delta in the epidermis results in defective cutaneous permeability barrier homeostasis and increased inflammation. J Invest Dermatol 2007; 128:370-7. [PMID: 17713572 DOI: 10.1038/sj.jid.5701026] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
In cultured human keratinocytes or murine epidermis, peroxisome proliferator-activated receptor beta/delta (PPARbeta/delta) (NR1C2) activators (1) stimulate keratinocyte differentiation; (2) decrease keratinocyte proliferation; (3) accelerate permeability barrier repair; (4) increase epidermal lipid synthesis; and (5) reduce cutaneous inflammation. Since these results suggest that PPARbeta/delta could play an important role in cutaneous homeostasis, we assessed here the skin phenotype of mice deficient in PPARbeta/delta. Gross cutaneous abnormalities were not evident, and both stratum corneum (SC) skin hydration and surface pH were normal. However, the epidermis was thickened and proliferating cell nuclear antigen (PCNA) staining was increased, indicating increased cell proliferation. No change in apoptosis was observed but the expression of differentiation markers, such as filaggrin, involucrin, and loricrin, was slightly increased in PPARbeta/delta(-/-) mice. Although basal permeability barrier function was normal, PPARbeta/delta knockout (KO) mice show a significant delay in barrier recovery rates following acute barrier disruption by either acetone treatment or tape-stripping. Delayed barrier recovery correlated with decreased production and secretion of lamellar bodies (LBs), and with reduced numbers of extracellular lamellar membranes in the SC. Finally, PPARbeta/delta KO mice displayed increased inflammation in response to 12-O-tetradecanoylphorbol-13-acetate (TPA) treatment. Together, these results further demonstrate that PPARbeta/delta in the epidermis: (1) is required for permeability barrier homeostasis; (2) regulates keratinocyte proliferation; and (3) modulates cutaneous inflammation.
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Affiliation(s)
- Mao-Qiang Man
- Department of Dermatology, University of California San Francisco and VA Medical Center San Francisco, San Francisco, California 94121, USA
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Sertznig P, Seifert M, Tilgen W, Reichrath J. Present concepts and future outlook: function of peroxisome proliferator-activated receptors (PPARs) for pathogenesis, progression, and therapy of cancer. J Cell Physiol 2007; 212:1-12. [PMID: 17443682 DOI: 10.1002/jcp.20998] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Peroxisome proliferator-activated receptors (PPARs) are members of the nuclear receptor superfamily of transcriptional regulators that regulate lipid, glucose, and amino acid metabolism. In recent studies it also has been shown that these receptors are implicated in tumor progression, cellular differentiation, and apoptosis and modulation of their function is therefore considered as a potential target for cancer prevention and treatment. PPAR ligands and other agents influencing PPAR signalling pathways have been shown to reveal chemopreventive potential by mediating tumor suppressive activities in a variety of human cancers and could represent a potential novel strategy to inhibit tumor carcinogenesis and progression. This review summarizes the currently available data on the roles of PPARs in relation to the processes of cell differentiation and carcinogenesis as well as their role as promising future therapeutic targets.
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Affiliation(s)
- P Sertznig
- Department of Dermatology, The Saarland University Hospital, Homburg/Saar, Germany
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41
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Jacobson EL, Kim H, Kim M, Williams JD, Coyle DL, Coyle WR, Grove G, Rizer RL, Stratton MS, Jacobson MK. A topical lipophilic niacin derivative increases NAD, epidermal differentiation and barrier function in photodamaged skin. Exp Dermatol 2007; 16:490-9. [PMID: 17518989 DOI: 10.1111/j.1600-0625.2007.00553.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The effects of myristyl nicotinate (MN), a nicotinic acid derivative designed to deliver nicotinic acid to skin without vasodilatation, on subjects with photodamaged skin have been studied. MN increased skin cell nicotinamide adenine dinucleotide (NAD) by 25% (P = 0.001) demonstrating effective delivery of nicotinic acid to skin. Relative to placebo, MN treatment of photodamaged facial skin increased stratum corneum thickness by approximately 70% (P = 0.0001) and increased epidermal thickness by approximately 20% (P = 0.001). In two separate studies, MN treatment increased rates of epidermal renewal by 6% (P = 0.003) to 11% (P = 0.001) and increased the minimal erythemal dose by 8.9 (P = 0.07) and 10% (P = 0.05) relative to placebo. MN treatment resulted in reductions in the rates of transepidermal water loss (TEWL) of approximately 20% relative to placebo on cheeks (P = 0.012) and arms (P = 0.017) of study subjects. Results of a tape stripping challenge before and after MN treatment demonstrated a significant correlation (P = 0.03) between increased skin NAD content and resistance to changes in TEWL for MN treated but not placebo subjects. Rates of TEWL changed more rapidly and to a greater extent in atopic subjects compared with normal subjects. The results indicate that MN enhances epidermal differentiation and barrier function in skin, suggesting that this method of nicotinic acid delivery may prove useful in limiting progression of actinic skin damage and possibly in treating other conditions involving skin barrier impairment.
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Affiliation(s)
- Elaine L Jacobson
- Department of Pharmacology and Toxicology, College of Pharmacy, Tucson, AZ 85724, USA.
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Choi EH, Demerjian M, Crumrine D, Brown BE, Mauro T, Elias PM, Feingold KR. Glucocorticoid blockade reverses psychological stress-induced abnormalities in epidermal structure and function. Am J Physiol Regul Integr Comp Physiol 2006; 291:R1657-62. [PMID: 16857896 DOI: 10.1152/ajpregu.00010.2006] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Many cutaneous disorders are adversely affected by psychological stress (PS), but the responsible mechanisms are poorly understood. Recent studies have demonstrated that PS decreases epidermal proliferation and differentiation, impairs permeability barrier homeostasis, and decreases stratum corneum integrity. PS also increases the production of endogenous glucocorticoids (GC), and both systemic and topical GC cause adverse effects on epidermal structure and function similar to those observed with PS. We therefore hypothesized that increased endogenous GC in PS mediates its adverse cutaneous effects. To test this hypothesis, we used two independent approaches, administering either RU-486, a GC receptor antagonist that inhibits GC action, or antalarmin, a corticotropin-releasing hormone (CRH) receptor antagonist that prevents increased GC production in the face of PS. Inhibition of either GC action or production prevents the PS-induced decline in epidermal cell proliferation and differentiation, impairment in permeability barrier homeostasis, and decrease in stratum corneum (SC) integrity. Moreover, the pathophysiological basis for the abnormality in permeability barrier homeostasis; i.e., decreased lamellar body production and secretion, is restored toward normal by inhibition of GC action. Similarly, the mechanistic basis for the decrease in SC integrity, i.e., a reduction in corneodesmosomes, is also normalized by inhibition of GC action. Thus many of the adverse effects of PS on epidermal structure and function can be attributed to increased endogenous GC and conversely, approaches that either reduce GC production or action might benefit cutaneous disorders that are provoked or exacerbated by PS.
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Affiliation(s)
- Eung-Ho Choi
- Dermatology and Medical Services (Metabolism Section), Veteran Affairs Medical Center, 111F 4150 Clement St., San Francisco, CA 94121, USA
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Jiang YJ, Lu B, Kim P, Elias PM, Feingold KR. Regulation of ABCA1 expression in human keratinocytes and murine epidermis. J Lipid Res 2006; 47:2248-58. [PMID: 16825673 DOI: 10.1194/jlr.m600163-jlr200] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Keratinocytes require abundant cholesterol for cutaneous permeability barrier function; hence, the regulation of cholesterol homeostasis is of great importance. ABCA1 is a membrane transporter responsible for cholesterol efflux and plays a pivotal role in regulating cellular cholesterol levels. We demonstrate that ABCA1 is expressed in cultured human keratinocytes (CHKs) and murine epidermis. Liver X receptor (LXR) activation markedly stimulates ABCA1 mRNA and protein levels in CHKs and mouse epidermis. In addition to LXR, activators of peroxisome proliferator-activated receptor (PPAR)alpha, PPARbeta/delta, and retinoid X receptor (RXR), but neither PPARgamma nor retinoic acid receptor, also increase ABCA1 expression in CHKs. Increases in cholesterol supply induced by LDL or mevalonate stimulate ABCA1 expression, whereas inhibiting cholesterol synthesis with statins or cholesterol sulfate decreases ABCA1 expression in CHKs. After acute permeability barrier disruption by either tape-stripping or acetone treatment, ABCA1 expression declines, and this attenuates cellular cholesterol efflux, making more cholesterol available for regeneration of the barrier. In addition, during fetal epidermal development, ABCA1 expression decreases at days 18-22 of gestation (term = 22 days), leaving more cholesterol available during the critical period of barrier formation. Together, our results show that ABCA1 is expressed in keratinocytes, where it is negatively regulated by a decrease in cellular cholesterol levels or altered permeability barrier requirements and positively regulated by activators of LXR, PPARs, and RXR or increases in cellular cholesterol levels.
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Affiliation(s)
- Yan J Jiang
- Metabolism Section, Veterans Affairs Medical Center, Northern California Institute for Research and Education, University of California at San Francisco, San Francisco, CA 94121, USA
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44
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Kim SH, Nam GW, Lee HK, Moon SJ, Chang IS. The effects of Musk T on peroxisome proliferator-activated receptor [PPAR]-alpha activation, epidermal skin homeostasis and dermal hyaluronic acid synthesis. Arch Dermatol Res 2006; 298:273-82. [PMID: 16977445 DOI: 10.1007/s00403-006-0684-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2006] [Revised: 06/06/2006] [Accepted: 07/05/2006] [Indexed: 01/02/2023]
Abstract
Peroxisome proliferators activated receptors (PPARs) are a family of nuclear hormone receptors that heterodimer with the retinoid X receptor and function as transcriptional regulators of genes. Topically Applied PPAR-alpha agonists possess receptor mediated, pro-differentiating/anti-proliferative effects, lipid metabolism stimulation, and anti-inflammatory activity, which suggest that they could be beneficial for the treatment of a variety of cutaneous diseases. Hyaluronan (HA), a high-molecular-weight linear glycosaminoglycan consisting of alternating D: -glucuronic acid and N-acetyl-D: -glucosamine residues, is one of the major extracellular matrix components in skin. Among the family of HA synthase genes (HAS1, 2, 3) so far identified, one group has demonstrated that the expressions of HAS2 and HAS3 play crucial roles in the regulation of HA synthesis in human skin fibroblasts and keratinocytes, respectively, but the precise regulatory mechanisms are still unknown. We examine Musk T called Ethylene brassylate, Astratone or 1,4-Dioxacycloheptadecane-5,17-dione, which used as just a perfume ingredient, plays a role as PPAR-alpha ligand in vitro and stimulates skin barrier recovery, ceramide synthesis, beta-Glucocerebrosidase, involucrin expression in epidermis in vivo; and examine that Musk T stimulates HAS expression and HA synthesis in human skin fibroblast. Through these experiments, we conclude that Musk T is PPAR-alpha ligand, effects on keratinocyte differentiation, intercellular lipid synthesis in epidermis, HA synthesis stimulation in dermis.
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Affiliation(s)
- Seung Hun Kim
- Safety and Efficacy Research, Skin Research Institute, Amorepacific Corporation/R&D Center, Yongin, South Korea.
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Kim S, Hong I, Hwang JS, Choi JK, Rho HS, Kim DH, Chang I, Lee SH, Lee MO, Hwang JS. Phytosphingosine stimulates the differentiation of human keratinocytes and inhibits TPA-induced inflammatory epidermal hyperplasia in hairless mouse skin. Mol Med 2006; 12:17-24. [PMID: 16838068 PMCID: PMC1514555 DOI: 10.2119/2006-00001.kim] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2006] [Accepted: 03/21/2006] [Indexed: 01/22/2023] Open
Abstract
The binding of sphingoid bases to peroxisome proliferator-activated receptor (PPAR) has been detected in a solid-phase binding assay. However, sphingoid base-induced changes in PPAR transactivation activity have not been examined. In this report, we show by reporter gene analyses that phytosphingosine (PS), a natural sphingoid base, activates the transcriptional activity of PPARs in the immortalized human keratinocyte, HaCaT. Real-time PCR analyses showed that the mRNA level of PPARgamma was increased after PS treatment in HaCaT cells in a dose- and time-dependent manner. Because PPARs play important roles in skin barrier homeostasis by regulating epidermal cell growth, terminal differentiation, and inflammatory response, we examined the effect of PS on normal human epidermal keratinocytes (NHEKs) and mouse skin. PS increased the production of cornified envelope in NHEKs by approximately 1.8-fold compared with controls. Epidermal differentiation marker proteins such as involucrin, loricrin, and keratin1 were also increased in PS-treated NHEKs, by ELISA or Western blotting analysis. A [(3)H]thymidine incorporation assay showed that PS inhibited DNA synthesis in NHEKs to 20% compared with controls. The antiproliferative and anti-inflammatory effects of PS were examined in a mouse model of irritant contact dermatitis produced by topical application of 12-O-tetradecanoylphorbol-13-acetate (TPA). PS blocked epidermal thickening and edema and the infiltration of inflammatory cells into the dermis in the skin of TPA-treated hairless mice. The anti-inflammatory effects of PS were confirmed by the observation that PS blocked the TPA-induced generation of prostaglandin E(2) in peripheral mononuclear leukocytes. Taken together, our results provide an insight into the multiple regulatory roles of PS in epidermal homeostasis, and furthermore point to the potential use of PS as a therapeutic agent in the treatment of inflammatory and proliferative cutaneous diseases.
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Affiliation(s)
- Sujong Kim
- Skin Research Institute, AmorePacific Corporation R&D Center, Kyounggi, South
Korea
- Address correspondence and reprint requests to Dr. Sujong Kim; Jae Sung
Hwang, Skin Research Institute, Amore-Pacific Corporation R&D Center, 314-1 Bora-ri, Kiheung-eup, Yongin-si, Kyounggi-do 449-729, Korea. Phone: +82-31-280-5962; fax: +82-31-282-6063; e-mail: (Sujong Kim); (Jae Sung Hwang)
| | - Il Hong
- College of Pharmacy and Bio-MAX Institute, Seoul National University, Seoul, South
Korea
| | - Jung Sun Hwang
- Skin Research Institute, AmorePacific Corporation R&D Center, Kyounggi, South
Korea
| | - Jin Kyu Choi
- Skin Research Institute, AmorePacific Corporation R&D Center, Kyounggi, South
Korea
| | - Ho Sik Rho
- Skin Research Institute, AmorePacific Corporation R&D Center, Kyounggi, South
Korea
| | - Duck Hee Kim
- Skin Research Institute, AmorePacific Corporation R&D Center, Kyounggi, South
Korea
| | - Ihseop Chang
- Skin Research Institute, AmorePacific Corporation R&D Center, Kyounggi, South
Korea
| | - Seung Hun Lee
- Department of Dermatology, Yonsei University College of Medicine, Seoul, South
Korea
| | - Mi-Ock Lee
- College of Pharmacy and Bio-MAX Institute, Seoul National University, Seoul, South
Korea
| | - Jae Sung Hwang
- Skin Research Institute, AmorePacific Corporation R&D Center, Kyounggi, South
Korea
- Address correspondence and reprint requests to Dr. Sujong Kim; Jae Sung
Hwang, Skin Research Institute, Amore-Pacific Corporation R&D Center, 314-1 Bora-ri, Kiheung-eup, Yongin-si, Kyounggi-do 449-729, Korea. Phone: +82-31-280-5962; fax: +82-31-282-6063; e-mail: (Sujong Kim); (Jae Sung Hwang)
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Bourguignon LYW, Ramez M, Gilad E, Singleton PA, Man MQ, Crumrine DA, Elias PM, Feingold KR. Hyaluronan-CD44 interaction stimulates keratinocyte differentiation, lamellar body formation/secretion, and permeability barrier homeostasis. J Invest Dermatol 2006; 126:1356-65. [PMID: 16557236 DOI: 10.1038/sj.jid.5700260] [Citation(s) in RCA: 121] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In this study we investigated whether hyaluronan (HA)-CD44 interaction influences epidermal structure and function. Our data show that CD44 deficiency is accompanied by reduction in HA staining in CD44 knockout (k/o) mouse skin leading to a marked thinning of epidermis versus wild-type mouse skin. A significant delay in the early barrier recovery (following acute barrier disruption) occurs in CD44 k/o versus wild-type mouse skin. To assess the basis for these alterations in CD44 k/o mouse epidermis, we determined that differentiation markers are greatly reduced in the epidermis of CD44 k/o versus wild-type mice, while conversely HA binding to CD44 triggers differentiation in cultured human keratinocytes. CD44 downregulation (using CD44 small interfering RNAs) also inhibits HA-mediated keratinocyte differentiation. Slower barrier recovery in CD44 k/o mice could be further attributed to reduced lamellar body formation, loss of apical polarization of LB secretion, and downregulation of cholesterol synthesis. Accordingly, HA-CD44 binding stimulates both LB formation and secretion. Together, these observations demonstrate new roles for HA-CD44 interaction in regulating both epidermal differentiation and lipid synthesis/secretion, which in turn influence permeability barrier homeostasis. HA-CD44 signaling could comprise a novel approach to treat skin disorders characterized by abnormalities in differentiation, lipid synthesis, and/or barrier function.
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Affiliation(s)
- Lilly Y W Bourguignon
- Department of Medicine, University of California San Francisco and VA Medical Center, San Francisco, California, USA. lilly.bourguignon.ucsf.edu
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Muzio G, Martinasso G, Trombetta A, Di Simone D, Canuto RA, Maggiora M. HMG-CoA reductase and PPARalpha are involved in clofibrate-induced apoptosis in human keratinocytes. Apoptosis 2006; 11:265-75. [PMID: 16502264 DOI: 10.1007/s10495-006-3559-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Contrasting data have been reported on the effects of clofibrate, a PPARalpha agonist and hypolipidemic drug. The carcinogenic and anti-apoptotic effects have been demonstrated especially in rodents in both "in vivo" and "in vitro" experiments. In contrast, in rat and human hepatoma cell lines, several reports have shown its concentration-dependent pro-apoptotic effect. No epidemiological data exist about its carcinogenetic effect in man. This study shows that clofibrate also induced apoptosis in a human non-tumour cell line, NCTC 2544, which shares the characteristic of proliferation with tumour cells. Both HMG-CoA reductase and PPARalpha were found to be involved in the signal transduction pathway inducing apoptosis, the former being the principal target: HMG-CoA reductase decreased and PPARalpha increased. Changes in HMG-CoA reductase expression caused activation of parameters leading to apoptosis via the mitochondria pathway. Clofibrate must be considered a pro-apoptotic molecule at concentrations of 0.25 mM and above: the effect is exercised not only on tumour cells but also on normal human proliferating cells. Clofibrate should thus be regarded as a potential drug to reduce the number of proliferating cells in pathological conditions.
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Affiliation(s)
- G Muzio
- Department of Experimental Oncology and Medicine, Turin University, Corso Raffaello 30, 10125, Turin, Italy
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Yang Q, Yamada A, Kimura S, Peters JM, Gonzalez FJ. Alterations in skin and stratified epithelia by constitutively activated PPARalpha. J Invest Dermatol 2006; 126:374-85. [PMID: 16374467 DOI: 10.1038/sj.jid.5700056] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Peroxisome proliferator-activated receptor (PPAR)alpha is a pleiotropic regulator in many cell types and has recently been implicated in skin homeostasis. To determine the role of PPARalpha in skin physiology, transgenic mice were generated using the tetracycline Tet-off regulatory system to target constitutively activated PPARalpha to the epidermis and other stratified epithelia by the bovine keratin K5 promoter. Expression of the transgene during early development resulted in postnatal lethality within 2 days after birth. A thin epidermis, few hair follicles, and abnormal development of the tongue were observed in neonatal transgenic mice. Early mortality was not observed when transgenic PPARalpha expression was diminished by administration of doxycycline (dox) to the mothers. The alterations noted in neonatal mice were not observed in adult mice upon re-expression of the PPARalpha transgene by withdrawing dox. Attenuated hyperplasia of interfollicular epidermis after topical application of the tumor promotor 12-O-tetradecanoyl-phorbol-13-acetate (TPA) was observed in adult mice expressing the PPARalpha transgene. In addition, expression of the PPARalpha transgene in mammary gland during pregnancy resulted in abnormal development of this organ and impaired lactation. Further investigations using primary keratinocytes revealed that expression of the transgene in keratinocytes resulted in increased differentiation and decreased proliferation, which may contribute to the observed phenotype in the transgenic mice. Thus, these results indicate that PPARalpha plays an important role in the development of stratified epithelia including skin, tongue, and mammary gland.
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Affiliation(s)
- Qian Yang
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA
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Demerjian M, Man MQ, Choi EH, Brown BE, Crumrine D, Chang S, Mauro T, Elias PM, Feingold KR. Topical treatment with thiazolidinediones, activators of peroxisome proliferator-activated receptor-?, normalizes epidermal homeostasis in a murine hyperproliferative disease model. Exp Dermatol 2006; 15:154-60. [PMID: 16480422 DOI: 10.1111/j.1600-0625.2006.00402.x] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In a murine model of epidermal hyperplasia reproducing some of the abnormalities of several common skin disorders, we previously demonstrated the antiproliferative and pro-differentiating effects of peroxisome proliferator-activated receptor (PPAR)alpha, PPARbeta/delta, and liver X receptor activators. Unlike other subgroups of PPAR activators, thiazolidinediones (TZDs), a family of PPARgamma ligands, did not inhibit keratinocyte proliferation in normal murine skin. Here, we studied the effects of two TZDs, namely ciglitazone (10 mM) and troglitazone (1 mM), in the same murine model where epidermal hyperproliferation was reproduced by repeated barrier abrogation with tape stripping. Topical treatment with ciglitazone and troglitazone resulted in a marked and significant decrease in epidermal thickness. Furthermore, in all TZD-treated groups, we observed a significant decrease in keratinocyte proliferation using proliferating cell nuclear antigen, 5-bromo-2'-deoxyuridine, and tritiated thymidine incorporation. However, using the terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling assay, we found no difference in apoptosis between different treatments, emphasizing that it is the antiproliferative role of these activators that accounts for the decrease of epidermal thickness. Finally, using immunohistochemical methods, we determined the effects of ciglitazone on keratinocyte differentiation in this hyperproliferative model. We observed an increased expression of involucrin and filaggrin following ciglitazone treatment, suggesting a pro-differentiating action of TZDs in this model. In summary, topical TZDs significantly reduce epidermal keratinocyte proliferation while promoting differentiation in a murine model of hyperproliferative epidermis. Together, these results suggest that in addition to their metabolic effects currently in use in the treatment of type 2 diabetes, topical TZDs could be considered as potential alternative therapeutic agents in hyperproliferative skin diseases such as psoriasis.
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Affiliation(s)
- Marianne Demerjian
- Department of Dermatology, University of California San Francisco and VA Medical Center, 4150 Clement Street, San Francisco, CA 94121, USA
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Schmuth M, Ortegon AM, Mao-Qiang M, Elias PM, Feingold KR, Stahl A. Differential expression of fatty acid transport proteins in epidermis and skin appendages. J Invest Dermatol 2006; 125:1174-81. [PMID: 16354187 DOI: 10.1111/j.0022-202x.2005.23934.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Epidermis and sebocyte-derived lipids are derived both from de novo synthesis and through uptake of fatty acids from the circulation. Plasma membrane proteins can significantly contribute to the latter process. In particular, fatty acid transport proteins (FATP/solute carrier family 27) are integral transmembrane proteins that enhance the uptake of long-chain fatty acids into cells. Using specific antisera against all six mammalian FATP, we found that both human and mouse skin express FATP1, -3, -4, and -6. In adult skin, FATP1 and -3 are expressed predominantly by keratinocytes, whereas FATP4 is strongly expressed by sebaceous glands and FATP6 by hair follicle epithelia. Sustained barrier disruption leads to increases in FATP1 and -6 levels as well as a robust increase in CD36 protein. Notably, expression of FATP1 by embryonic keratinocytes at day 18.5 was lower, and FATP4 increased in comparison with adult epidermis. Together, these findings indicate that FATP are not only expressed by different cell types within the skin, but also that their localization is dynamically regulated during development.
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Affiliation(s)
- Matthias Schmuth
- Department of Dermatology, Innsbruck Medical University, Innsbruck, Austria
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