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Portugal-Cohen M, Oron M, Cohen D, Ma'or Z, Soroka Y, Frusic-Zlotkin M, Kohen R. Advancements in non-invasive skin sampling: Clinical conditions characterization via the assessment of skin surface cytokine biomarkers. Exp Dermatol 2024; 33:e15037. [PMID: 38389180 DOI: 10.1111/exd.15037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 02/02/2024] [Accepted: 02/06/2024] [Indexed: 02/24/2024]
Abstract
The skin is increasingly recognized as a biological active organ interacting with the immune system. Given that the epidermal skin layer actively releases various cytokines, non-invasive skin sampling methods could detect these cytokines, offering insights into clinical conditions. This study aims non-invasively measuring cytokine levels directly from the skin surface to characterize different inflammatory chronic disorders in the adult and elderly population: psoriasis, diabetes type 2, rosacea, chronic kidney disease (CKD) and aging. Cytokines IL-1β, IL-8 and IL-10 were sampled from healthy subjects and patients aged 18-80 using skin surface wash technique. A well with sterile phosphate-buffered saline solution was placed on the skin for 30 min, and the extracted solution was collected from the well for further cytokine levels analysis using ELISA assay. Results show distinct cytokine profiles in different pathological processes, healthy controls, affected and unaffected areas. Aging was associated with increased IL-1β, IL-8, and IL-10 levels in skin. In diabetes, IL-1β and IL-8 levels were elevated in lesional areas, while IL-10 levels were decreased in non-lesional skin. Psoriatic lesions showed elevated levels of IL-1β and IL-8. Rosacea patients had lower IL-10 levels in both lesional and non-lesional areas. CKD patients exhibited significantly lower IL-10 levels compared to healthy individuals. In conclusion, skin surface wash-derived cytokine profiles could serve as "alert biomarkers" for disease prediction, enabling early detection. Additionally, this method's cost-effectiveness allows pre-screening of molecules in clinical studies and holds potential as a tool for biomarkers and omics analysis, enhancing disorder characterization and disease management.
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Affiliation(s)
| | | | - Dror Cohen
- DermAb.io, Haifa, Israel
- The Myers Skin Research Laboratory, Faculty of Medicine, School of Pharmacy, Institute for Drug Research, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Ze'evi Ma'or
- The Skin Research Institute, The Dead-Sea & Arava Science Center, Israel
| | - Yoram Soroka
- The Myers Skin Research Laboratory, Faculty of Medicine, School of Pharmacy, Institute for Drug Research, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Marina Frusic-Zlotkin
- The Myers Skin Research Laboratory, Faculty of Medicine, School of Pharmacy, Institute for Drug Research, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Ron Kohen
- The Myers Skin Research Laboratory, Faculty of Medicine, School of Pharmacy, Institute for Drug Research, The Hebrew University of Jerusalem, Jerusalem, Israel
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Portugal-Cohen M, Cohen D, Kohen R, Oron M. Exploitation of alternative skin models from academia to industry: proposed functional categories to answer needs and regulation demands. Front Physiol 2023; 14:1215266. [PMID: 37334052 PMCID: PMC10272927 DOI: 10.3389/fphys.2023.1215266] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 05/17/2023] [Indexed: 06/20/2023] Open
Affiliation(s)
| | - Dror Cohen
- DermAb.io, Haifa, Israel
- The Myers Skin Research Laboratory, Faculty of Medicine, School of Pharmacy, Institute for Drug Research, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Ron Kohen
- The Myers Skin Research Laboratory, Faculty of Medicine, School of Pharmacy, Institute for Drug Research, The Hebrew University of Jerusalem, Jerusalem, Israel
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Cohen D, Portugal-Cohen M, Oron M, Frusic-Zlotkin M, Soroka Y, Ma'or Z, Amar D, Kohen R. Cutaneous Nrf2-Keap1 pathway modulation by environmental factors: The Dead Sea area as a test case. Biofactors 2022; 49:428-437. [PMID: 36522798 DOI: 10.1002/biof.1926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 11/28/2022] [Indexed: 12/23/2022]
Abstract
The skin is constantly exposed to exogenous environmental stressors and has to cope with excessive oxidative stress and tissue damage. However, exposure to moderate environmental stressors may be beneficial for the cutaneous tissue and assist in protecting against oxidative damage via the enhanced activation of the nuclear factor erythroid 2-related factor 2-Kelch-like ECH-associated protein 1 (Nrf2-Keap1) pathway. Such moderate stressors can be found in various locations around the globe. In this manuscript, we chose to focus on the Dead Sea (DS) area as a test case to study the effect of moderate stressors on the cutaneous tissue because of the unique combinations of moderate stressors in this area. The exceptional location of the DS at an altitude of -438 meters below sea level (the lowest place on earth) is responsible for its rare accumulation of moderate stressors such as high-water salinity, high atmospheric pressure, and unique solar radiation. In this manuscript, we hypothesized that the unique solar radiation in the DS area generates moderate oxidative stress in the skin leading to the induction of intracellular electrophiles, which in turn can activate the protecting Nrf2-Keap1 pathway. We showed that exposure of human skin organ culture from the same donor to solar radiation at the DS resulted in significant activation of the Nrf2-Keap1 pathway, induction of phase II enzymes, and lower apoptotic activity compared to a nearby location at a higher altitude (Jerusalem +700 m). This remarkable effect of activating the Nrf2 protecting pathway and the importance and characteristics of the solar irradiation at the DS is discussed.
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Affiliation(s)
- Dror Cohen
- The Myers Skin Research Laboratory, Faculty of Medicine, Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem, Israel
- The Skin Research Institute, The Dead Sea & Arava Science Center, Masada, Israel
| | | | - Miriam Oron
- Miriam Oron Mingelgrin Consulting, Jerusalem, Israel
| | - Marina Frusic-Zlotkin
- The Myers Skin Research Laboratory, Faculty of Medicine, Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Yoram Soroka
- The Myers Skin Research Laboratory, Faculty of Medicine, Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Ze'evi Ma'or
- The Dead Sea Hub department, Fosun Jinmei (Shanghai) Cosmetics Co., Ltd, Shanghai, China
| | - Dalit Amar
- Department of Plastic, Reconstructive and Aesthetic Surgery, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Ron Kohen
- The Myers Skin Research Laboratory, Faculty of Medicine, Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem, Israel
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Ron-Doitch S, Frušić-Zlotkin M, Soroka Y, Duanis-Assaf D, Amar D, Kohen R, Steinberg D. eDNA-Mediated Cutaneous Protection Against UVB Damage Conferred by Staphylococcal Epidermal Colonization. Microorganisms 2021; 9:microorganisms9040788. [PMID: 33918948 PMCID: PMC8068790 DOI: 10.3390/microorganisms9040788] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 04/05/2021] [Accepted: 04/07/2021] [Indexed: 01/10/2023] Open
Abstract
The human skin is a lush microbial habitat which is occupied by a wide array of microorganisms. Among the most common inhabitants are Staphylococcus spp., namely Staphylococcus epidermidis and, in ≈20% of healthy individuals, Staphylococcus aureus. Both bacteria have been associated with cutaneous maladies, where they mostly arrange in a biofilm, thus achieving improved surface adhesion and stability. Moreover, our skin is constantly exposed to numerous oxidative environmental stressors, such as UV-irradiation. Thus, skin cells are equipped with an important antioxidant defense mechanism, the Nrf2–Keap1 pathway. In this work, we aimed to explore the morphology of S. aureus and S. epidermidis as they adhered to healthy human skin and characterize their matrix composition. Furthermore, we hypothesized that the localization of both types of bacteria on a healthy skin surface may provide protective effects against oxidative stressors, such as UV-irradiation. Our results indicate for the first time that S. aureus and S. epidermidis assume a biofilm-like morphology as they adhere to ex vivo healthy human skin and that the cultures’ extracellular matrix (ECM) is composed of extracellular polysaccharides (EPS) and extracellular DNA (eDNA). Both bacterial cultures, as well as isolated S. aureus biofilm eDNA, conferred cutaneous protection against UVB-induced apoptosis. This work emphasized the importance of skin microbiota representatives in the maintenance of a healthy cutaneous redox balance by activating the skin’s natural defense mechanism.
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Affiliation(s)
- Sapir Ron-Doitch
- Biofilm Research Laboratory, Faculty of Dental Medicine, Institute of Dental Sciences, Hebrew University-Hadassah, Jerusalem 91120, Israel; (S.R.-D.); (D.D.-A.)
- The Myers Skin Research Laboratory, Faculty of Medicine, Institute for Drug Research, School of Pharmacy, Hebrew University of Jerusalem, Jerusalem 9103401, Israel; (M.F.-Z.); (Y.S.); (R.K.)
| | - Marina Frušić-Zlotkin
- The Myers Skin Research Laboratory, Faculty of Medicine, Institute for Drug Research, School of Pharmacy, Hebrew University of Jerusalem, Jerusalem 9103401, Israel; (M.F.-Z.); (Y.S.); (R.K.)
| | - Yoram Soroka
- The Myers Skin Research Laboratory, Faculty of Medicine, Institute for Drug Research, School of Pharmacy, Hebrew University of Jerusalem, Jerusalem 9103401, Israel; (M.F.-Z.); (Y.S.); (R.K.)
| | - Danielle Duanis-Assaf
- Biofilm Research Laboratory, Faculty of Dental Medicine, Institute of Dental Sciences, Hebrew University-Hadassah, Jerusalem 91120, Israel; (S.R.-D.); (D.D.-A.)
| | - Dalit Amar
- Department of Plastic, Reconstructive and Aesthetic Surgery, Faculty of Medicine, Hebrew University of Jerusalem, Israel, Hadassah Medical Center, Jerusalem 9103401, Israel;
| | - Ron Kohen
- The Myers Skin Research Laboratory, Faculty of Medicine, Institute for Drug Research, School of Pharmacy, Hebrew University of Jerusalem, Jerusalem 9103401, Israel; (M.F.-Z.); (Y.S.); (R.K.)
| | - Doron Steinberg
- Biofilm Research Laboratory, Faculty of Dental Medicine, Institute of Dental Sciences, Hebrew University-Hadassah, Jerusalem 91120, Israel; (S.R.-D.); (D.D.-A.)
- Correspondence:
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Xiao Y, Al Khoury A, Golovics P, Kohen R, Afif W, Wild G, Friedman G, Galiatsatos P, Hilzenrat N, Szilagyi A, Wyse J, Cohen A, Bitton A, Bessissow T, Lakatos PL. A157 REAL-WORLD TIGHT OBJECTIVE MONITORING WITH ADALIMUMAB LEADS TO EARLIER DOSE OPTIMIZATION AND HIGHER CLINICAL REMISSION RATES AT 12 MONTHS. J Can Assoc Gastroenterol 2021. [DOI: 10.1093/jcag/gwab002.155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Data suggests that tight objective monitoring of inflammatory bowel diseases (IBD) may improve one-year clinical outcomes.
Aims
The goal of this study is to assess the adherence to serial tight objective monitoring, via clinical symptoms and biomarkers, and the effect of such tight monitoring on one year outcome in IBD patients at an academic and an university-affiliated center.
Methods
We retrospectively reviewed the chart of 428 consecutive IBD patients who started adalimumaby at the McGill University Health Center and Jewish General Hospital (Montreal, Canada) between January 1, 2015 and January 1, 2019 [338 Crohn’s disease(CD), 90 ulcerative colitis(UC)]. Clinical symptoms (assessed by Harvey-Bradshaw-Index and partial Mayo), C-Reactive Protein(CRP), and fecal calprotectin(FCAL) were captured at treatment initiation and at 3, 6, 9, and 12 months. Combined adherence was defined as the evaluation of ≥2 of 3 parameters(clinical, CRP, FCAL). Dose optimization and drug sustainability curves were plotted by Kaplan-Meier method.
Results
Clinical symptoms were assessed in nearly all patients at 3 (CD-UC:95-94%), 6 (90-83%), 9 (86-85%) and 12 (96-89%) months. CRP was also available for most patients but the frequency of assessment decreased in CD patients over the study period. In comparison, compliance to serial FCAL testing was low throughout the follow-up period. Clinical remission at one-year was significantly higher in patients who were adherent to early assessment visit at 3 months (p=0.001 both for CD and UC). Adherence to early follow-up also resulted in earlier dose optimisation in both CD and UC patients(pLogrank=0.026 for UC and p=0.09 for CD). However, the overall drug sustainability did not differ.
Conclusions
Clinical assessment and CRP, but not FCAL, were frequently assessed in patients starting adalimumab. Adherence to early objective combined follow-up visits resulted in earlier dose optimization and improved one-year clinical outcomes but did not change drug sustainability rates.
Funding Agencies
None
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Affiliation(s)
- Y Xiao
- Internal Medicine, McGill University, Montreal, QC, Canada
| | | | | | - R Kohen
- McGill University Health Centre, Montreal, QC, Canada
| | - W Afif
- McGill University Health Centre, Montreal, QC, Canada
| | - G Wild
- McGill University Health Centre, Montreal, QC, Canada
| | - G Friedman
- Sir Mortimer B Davis Jewish General Hospital, Montreal, QC, Canada
| | - P Galiatsatos
- Sir Mortimer B Davis Jewish General Hospital, Montreal, QC, Canada
| | - N Hilzenrat
- Sir Mortimer B Davis Jewish General Hospital, Montreal, QC, Canada
| | - A Szilagyi
- Sir Mortimer B Davis Jewish General Hospital, Montreal, QC, Canada
| | - J Wyse
- Sir Mortimer B Davis Jewish General Hospital, Montreal, QC, Canada
| | - A Cohen
- Sir Mortimer B Davis Jewish General Hospital, Montreal, QC, Canada
| | - A Bitton
- McGill University Health Centre, Montreal, QC, Canada
| | - T Bessissow
- Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - P L Lakatos
- IBD Centre, McGill University Health Center, Montreal, QC, Canada
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Ron-Doitch S, Kohen R. The Cutaneous Physiological Redox: Essential to Maintain but Difficult to Define. Antioxidants (Basel) 2020; 9:antiox9100942. [PMID: 33019510 PMCID: PMC7600519 DOI: 10.3390/antiox9100942] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 09/16/2020] [Accepted: 09/23/2020] [Indexed: 12/13/2022] Open
Abstract
Skin is a unique tissue, possessing extremely efficient protective and regulative mechanisms, similar only to the gut and lungs. These tissues serve as an interface with the environment and are exposed to stressors from both endogenous and exogenous sources. Interestingly, all these stressors lead downstream to a cellular production of reactive oxygen species (ROS) and other electrophiles, which, in turn could have deleterious outcomes for the living organism. Hence, such tissues should always maintain a “high-alert” condition in order to cope with these various insults. Nevertheless, a moderate production of ROS induced by stressors could actually be beneficial, although it is impossible to predict if and which exposure would lead to which outcome. Consequently, a parameter which would indicate the skin’s readiness to cope with continuously fluctuating conditions is required. It has been proposed that the redox status may serve as a suitable indicator. In this opinion manuscript, we argue that the redox status is a vague parameter that is difficult to characterized and quantify due to its extremely dynamic nature. The common convention that the redox status is composed solely of the balance between oxidants and reductants (ROS and antioxidants) is also thought-provoking. Since this parameter in vivo behaves in a dynamic and complex manner, it better fits the description of a process, rather than an individual parameter. We suggest that the homeostatic modulation of the physiological redox (PR) should be in focus, rather than the redox status parameter itself. It is further suggested that low molecular weight antioxidants (LMWA) are, in fact, rather insignificant concerning the PR maintenance, and that the major contributors to this delicate modulation are regulative, protein-based systems such as the protective phase II antioxidant enzymes. Moreover, we show that skin microbiome and cutaneous advanced lipid peroxidation end-products (ALEs) take part in sustaining the cutaneous PR homoeostasis via activation of the Nrf2–Keap1 protective pathway.
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Ron-Doitch S, Soroka Y, Frusic-Zlotkin M, Barasch D, Steinberg D, Kohen R. Saturated and aromatic aldehydes originating from skin and cutaneous bacteria activate the Nrf2-keap1 pathway in human keratinocytes. Exp Dermatol 2020; 30:1381-1387. [PMID: 32347981 DOI: 10.1111/exd.14103] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 03/17/2020] [Accepted: 04/22/2020] [Indexed: 12/18/2022]
Abstract
Skin homeostasis is constantly challenged by environmental factors, affecting its delicate redox balance. The skin is also home to a wide variety of bacterial species, including Staphylococci. The cutaneous redox state is governed by the Nrf2-keap1 pathway, which is responsible for the induction of phase II cytoprotective enzymes, thus sustaining a healthy oxidative state. As part of normal metabolism, both bacteria and cutaneous tissue emit copious amounts of volatile organic compounds (VOCs), one subgroup of which are aldehydes. α,β-unsaturated aldehydes are known activators of Nrf2-keap1 pathway by direct oxidation of the keap1 protein. However, we did not encounter reports of Nrf2 activation by saturated or aromatic aldehydes, neither bacteria nor skin-derived. We hypothesized that non-α,β-unsaturated aldehydes derived from skin or cutaneous bacteria may act as Nrf2-keap1 pathway activators and therefore afford protection against environmental insults. The saturated aldehydes nonanal and decanal (known skin metabolites) and the aromatic aldehyde benzaldehyde (known skin and Staphylococcus epidermidis metabolite) were shown to induce the Nrf2-keap1 pathway in human keratinocytes. We also identified a newly described aromatic aldehyde, 3-furaldehyde (3-FA), emitted from S. aureus and S. epidermidis cultures, which also activated the pathway. Moreover, Nrf2-keap1 induction led to a significant protection against UVB-induced apoptosis. The mechanism involved in this activation has been partially elucidated. This work emphasizes the importance of cutaneous bacteria, as well as healthy skin lipid peroxidation processes in the maintenance and regulation of the cellular antioxidant response, namely with regard to coping with environmental stressors.
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Affiliation(s)
- Sapir Ron-Doitch
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel.,Biofilm Research Laboratory, Institute of Dental Sciences, Faculty of Dental Medicine, Hebrew University-Hadassah, Jerusalem, Israel
| | - Yoram Soroka
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Marina Frusic-Zlotkin
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Dinorah Barasch
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Doron Steinberg
- Biofilm Research Laboratory, Institute of Dental Sciences, Faculty of Dental Medicine, Hebrew University-Hadassah, Jerusalem, Israel
| | - Ron Kohen
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
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Xiao Y, Lakatos PL, Bourdages R, Bitton A, Afif W, Kohen R, Berberi M, Bessissow T. A232 EFFICACY OF TOFACITINIB FOR THE TREATMENT OF MODERATE-TO-SEVERE ULCERATIVE COLITIS: REAL-WORLD DATA. J Can Assoc Gastroenterol 2020. [DOI: 10.1093/jcag/gwz047.231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
A significant proportion of patients with moderate to severe ulcerative colitis (UC) do not respond to therapy, which includes thiopurines, glucocorticoids, and antagonists to tumour necrosis factor-α and integrin. Tofacitinib, a Janus Kinase inhibitor, has emerged as an efficacious and safe treatment for moderate to severe ulcerative colitis. However, it is not known if this efficacy translates into real-life effectiveness in a regular clinical practice.
Aims
We aimed to assess the rate of clinical response and clinical remission at 3 and 6 months after tofacitinib initiation. Secondary endpoints included rate of biomarker normalization, corticosteroids-free clinical remission and severe infections.
Methods
We conducted a multi-center retrospective observational study of adult patients with active UC started on tofacitinib from January 1, 2015 to October 1, 2019 at the McGill University Health Center and Hotel-Dieu de Lévis. A positive clinical response was defined as a decrease of ≥3 in the partial Mayo score. Clinical remission was defined as partial Mayo score of ≤2. Biomarker normalization was defined as fecal calprotectin ≤250ug/g. Severe infection was defined as an infection requiring hospitalization.
Results
During the study period, 40 patients with UC were started on tofacitinib. Amongst the patients, 85% (n=34) had failed ≥1 biologic and 50% (n=20) had failed ≥3 biologics. At the time of this preliminary analysis, 38 patients had undergone 3 months of treatment and 30 patients had undergone 6 months of treatment. At 3 months, a clinical response was seen in 89.5% of patients (n=34) and clinical remission occurred in 63.2% (n=24). At 6 months, clinical response occurred in 73.3% of patients (n=22) and clinical remission was sustained in 53.33% (n=16). Biochemical normalization occurred in 29.0% (n=11) and 30.0% (n=9) at 3 and 6 months, respectively. Additionally, 63.2% (n=24) and 43.3% of patients (n=13) achieved steroid-free clinical remission at 3 and 6 months, respectively. In the interim, one patient developed a serious infection requiring discontinuation of drug.
Conclusions
Our preliminary analysis demonstrates that in a real-life setting, tofacitinib is an effective treatment for inducing clinical remission in refractory UC patients. Further data will be complied to better assess the efficacy over a longer follow up.
Funding Agencies
None
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Affiliation(s)
- Y Xiao
- Internal Medicine, McGill University, Montreal, QC, Canada
| | - P L Lakatos
- Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - R Bourdages
- Hotel Dieu Hospital of Lévis, Quebec City, QC, Canada
| | - A Bitton
- Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - W Afif
- Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - R Kohen
- Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - M Berberi
- Hotel Dieu Hospital of Lévis, Quebec City, QC, Canada
| | - T Bessissow
- Gastroenterology, McGill University Health Center, Montreal, QC, Canada
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Singh K, Al Khoury A, Kurti Z, Gonczi L, Reinglas J, Verdon C, Kohen R, Bessissow T, Afif W, Wild G, Seidman EG, Bitton A, Lakatos P. A134 HIGH ADHERENCE TO SURVEILLANCE GUIDELINES IN IBD RESULTS IN LOW CRC AND DYSPLASIA RATES, WHILE RATES OF DYSPLASIA AND CANCER ARE LOW BEFORE THE SUGGESTED START OF SURVEILLANCE. RESULTS FROM A TERTIARY IBD CENTER. J Can Assoc Gastroenterol 2019. [DOI: 10.1093/jcag/gwz006.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- K Singh
- McGill University Health Center, Montreal, QC, Canada
| | - A Al Khoury
- McGill University Health Center, Montreal, QC, Canada
| | - Z Kurti
- Semmelweis University, Budapest, Hungary
| | - L Gonczi
- Semmelweis University, Budapest, Hungary
| | - J Reinglas
- McGill University Health Center, Montreal, QC, Canada
| | - C Verdon
- McGill University Health Center, Montreal, QC, Canada
| | - R Kohen
- McGill University Health Center, Montreal, QC, Canada
| | - T Bessissow
- McGill University Health Center, Montreal, QC, Canada
| | - W Afif
- McGill University Health Center, Montreal, QC, Canada
| | - G Wild
- McGill University Health Center, Montreal, QC, Canada
| | - E G Seidman
- McGill University Health Center, Montreal, QC, Canada
| | - A Bitton
- Royal Victoria Hospital, McGill University, Montreal, QC, Canada
| | - P Lakatos
- McGill University Health Center, Montreal, QC, Canada
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Reinglas J, Restellini S, Gonczi L, Kurti Z, Nene S, Kohen R, Afif W, Bessissow T, Wild G, Seidman EG, Lakatos P. A112 HARMONIZATION OF QUALITY OF CARE IN AN IBD CENTER IMPACTS DISEASE OUTCOMES: IMPORTANCE OF STRUCTURE AND PROCESS INDICATORS. J Can Assoc Gastroenterol 2019. [DOI: 10.1093/jcag/gwz006.111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- J Reinglas
- McGill University Health Center, Montreal, QC, Canada
| | - S Restellini
- Geneva’s University Hospitals and University of Geneva, Geneva, Switzerland
| | - L Gonczi
- Semmelweis University, Budapest, Hungary
| | - Z Kurti
- Semmelweis University, Budapest, Hungary
| | - S Nene
- McGill University Health Center, Montreal, QC, Canada
| | - R Kohen
- McGill University Health Center, Montreal, QC, Canada
| | - W Afif
- Gastroenterology, McGill University, Montreal, QC, Canada
| | - T Bessissow
- Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - G Wild
- McGill University Health Center, Montreal, QC, Canada
| | - E G Seidman
- McGill University Health Center, Montreal, QC, Canada
| | - P Lakatos
- McGill University Health Center, Montreal, QC, Canada
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12
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Singh K, Al Khoury A, Kurti Z, Gonczi L, Reinglas J, Verdon C, Kohen R, Bessissow T, Afif W, Wild G, Seidman EG, Bitton A, Lakatos P. A76 HIGH ADHERENCE TO SURVEILLANCE GUIDELINES IN IBD RESULTS IN LOW CRC AND DYSPLASIA RATES, WHILE RATES OF DYSPLASIA AND CANCER ARE LOW BEFORE THE SUGGESTED START OF SURVEILLANCE. RESULTS FROM A TERTIARY IBD CENTER. J Can Assoc Gastroenterol 2019. [DOI: 10.1093/jcag/gwz006.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- K Singh
- McGill University, Montreal, QC, Canada
| | | | - Z Kurti
- Semmelweis University , Budapest, Hungary
| | - L Gonczi
- Semmelweis University , Budapest, Hungary
| | | | - C Verdon
- Gastroenterology, McGill University, Montreal, QC, Canada
| | - R Kohen
- Gastroenterology, McGill University, Montreal, QC, Canada
| | - T Bessissow
- Gastroenterology, McGill University, Montreal, QC, Canada
| | - W Afif
- Gastroenterology, McGill University, Montreal, QC, Canada
| | - G Wild
- Gastroenterology, McGill University, Montreal, QC, Canada
| | - E G Seidman
- Gastroenterology, McGill University, Montreal, QC, Canada
| | - A Bitton
- Gastroenterology, McGill University, Montreal, QC, Canada
| | - P Lakatos
- Gastroenterology, McGill University, Montreal, QC, Canada
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Nene S, Reinglas J, Gonczi L, Kurti Z, Restellini S, Kohen R, Afif W, Bessissow T, Wild G, Seidman EG, Bitton A, Lakatos P. A78 IMPACT OF IMPLEMENTING A RAPID ACCESS CLINIC IN A HIGH-VOLUME INFLAMMATORY BOWEL DISEASE CENTER: ACCESSIBILITY, REASOURCE UTILISATION AND OUTCOMES. J Can Assoc Gastroenterol 2019. [DOI: 10.1093/jcag/gwz006.077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- S Nene
- McGill University Health Center, Montreal, QC, Canada
| | - J Reinglas
- McGill University Health Center, Montreal, QC, Canada
| | - L Gonczi
- Semmelweis University, Budapest, Hungary
| | - Z Kurti
- Semmelweis University, Budapest, Hungary
| | - S Restellini
- Geneva’s University Hospitals and University of Geneva, Geneva, Switzerland
| | - R Kohen
- McGill University Health Center, Montreal, QC, Canada
| | - W Afif
- McGill University Health Center, Montreal, QC, Canada
| | - T Bessissow
- McGill University Health Center, Montreal, QC, Canada
| | - G Wild
- McGill University Health Center, Montreal, QC, Canada
| | - E G Seidman
- McGill University Health Center, Montreal, QC, Canada
| | - A Bitton
- McGill University Health Center, Montreal, QC, Canada
| | - P Lakatos
- McGill University Health Center, Montreal, QC, Canada
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Al Khoury A, Singh K, Kurti Z, Gonczi L, Reinglas J, Verdon C, Kohen R, Bessissow T, Afif W, Wild G, Seidman EG, Bitton A, Lakatos P. A105 HIGH ADHERENCE TO SURVEILLANCE GUIDELINES IN IBD RESULTS IN LOW CRC AND DYSPLASIA RATES, WHILE RATES OF DYSPLASIA AND CANCER ARE LOW BEFORE THE SUGGESTED START OF SURVEILLANCE. RESULTS FROM A TERTIARY IBD CENTER. J Can Assoc Gastroenterol 2019. [DOI: 10.1093/jcag/gwz006.104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
| | - K Singh
- McGill University, Montreal, QC, Canada
| | - Z Kurti
- Semmelweis University, Budapest, Hungary
| | - L Gonczi
- Semmelweis University, Budapest, Hungary
| | | | - C Verdon
- McGill University, Montreal, QC, Canada
| | - R Kohen
- McGill University, Montreal, QC, Canada
| | - T Bessissow
- Gastroenterology, McGill University, Montreal, QC, Canada
| | - W Afif
- Gastroenterology, McGill University, Montreal, QC, Canada
| | - G Wild
- McGill University, Montreal, QC, Canada
| | - E G Seidman
- Gastroenterology, McGill University, Montreal, QC, Canada
| | - A Bitton
- Royal Victoria Hospital, McGill University, Montreal, QC, Canada
| | - P Lakatos
- Gastroenterology, McGill University, Montreal, QC, Canada
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Restellini S, Gonczi L, Kurti Z, Bessissow T, Afif W, Wild G, Kohen R, Seidman EG, Bitton A, Lakatos PL. A153 QUALITY OF CARE AND OUTCOMES IN A TERTIARY HOSPITAL INFLAMMATORY BOWEL (IBD) CENTER: MONITORING AND TREATMENT ALGORITHMS DURING FOLLOW-UP. J Can Assoc Gastroenterol 2018. [DOI: 10.1093/jcag/gwy009.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- S Restellini
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - L Gonczi
- Semmelweis University, Budapest, Hungary
| | - Z Kurti
- Semmelweis University, Budapest, Hungary
| | - T Bessissow
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - W Afif
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - G Wild
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - R Kohen
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - E G Seidman
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - A Bitton
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - P L Lakatos
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
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Restellini S, Gonczi L, Kurti Z, Afif W, Bessissow T, Wild G, Seidman EG, Kohen R, Bitton A, Lakatos PL. A155 QUALITY OF CARE IN THE INFLAMMATORY BOWEL DISEASES (IBD) CENTER FROM A TERTIARY REFERRAL HOSPITAL: PATIENT ASSESSMENT STRATEGY AT REFERRAL. J Can Assoc Gastroenterol 2018. [DOI: 10.1093/jcag/gwy009.155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- S Restellini
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - L Gonczi
- Semmelweis University, Budapest, Hungary
| | - Z Kurti
- Semmelweis University, Budapest, Hungary
| | - W Afif
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - T Bessissow
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - G Wild
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - E G Seidman
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - R Kohen
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - A Bitton
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
| | - P L Lakatos
- Division of Gastroenterology, McGill University Health Center, Montreal, QC, Canada
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Lenchner I, Segev G, Ari TB, Kohen R, Sirota R, Bruchim Y. Serial evaluation of serum total reduction power potential by cyclic voltammetry in 30 dogs with gastric dilatation and volvulus- a randomised, controlled (lidocaine vs placebo), clinical trial. Res Vet Sci 2017; 117:92-96. [PMID: 29202314 DOI: 10.1016/j.rvsc.2017.11.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Revised: 07/25/2017] [Accepted: 11/26/2017] [Indexed: 10/18/2022]
Affiliation(s)
- Itzik Lenchner
- Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel.
| | - Gilad Segev
- Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
| | - Tomer Ben Ari
- Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
| | - Ron Kohen
- Department of Pharmaceutics, School of Pharmacy, The Hebrew University of Jerusalem, P.O. Box 12065, Jerusalem 91120, Israel
| | - Roman Sirota
- Department of Pharmaceutics, School of Pharmacy, The Hebrew University of Jerusalem, P.O. Box 12065, Jerusalem 91120, Israel
| | - Yaron Bruchim
- Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
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18
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Beiser T, Numa R, Kohen R, Yaka R. Chronic treatment with Tempol during acquisition or withdrawal from CPP abolishes the expression of cocaine reward and diminishes oxidative damage. Sci Rep 2017; 7:11162. [PMID: 28894248 PMCID: PMC5593848 DOI: 10.1038/s41598-017-11511-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Accepted: 08/25/2017] [Indexed: 01/05/2023] Open
Abstract
In previous studies, we reported that pretreatment with the antioxidant Tempol attenuated the development and expression of cocaine-induced psychomotor sensitization in rats and diminished cocaine-induced oxidative stress (OS) in the prefrontal cortex (PFC) and nucleus accumbens (NAc), suggesting a potential role for Tempol in interfering with cocaine-related psychomotor sensitization. The aim of the current study was to examine the role of Tempol in reward and reinforcement using the conditioned place preference (CPP) paradigm. We found that administration of Tempol during the conditioning session abolished the expression of cocaine-induced CPP. We also found that OS was significantly elevated following the establishment of CPP, and that cocaine-induced OS was significantly diminished by pretreatment with Tempol during conditioning. Furthermore, we found that repeated, but not single, administration of Tempol for seven days during withdrawal from CPP resulted in significant attenuation in the expression of CPP. Moreover, Tempol did not affect the expression of food reward. Taken together, these findings provide evidence for the involvement of Tempol in regulating cocaine rewarding properties without affecting natural rewards. Since Tempol was found to be effective in reducing OS and expression of CPP following withdrawal, it may be a potential treatment for cocaine addiction.
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Affiliation(s)
- Tehila Beiser
- Institute for Drug Research (IDR), School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, 91120, Israel
| | - Ran Numa
- Institute for Drug Research (IDR), School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, 91120, Israel
| | - Ron Kohen
- Institute for Drug Research (IDR), School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, 91120, Israel
| | - Rami Yaka
- Institute for Drug Research (IDR), School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, 91120, Israel.
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Ben-Yehuda Greenwald M, Frušić-Zlotkin M, Soroka Y, Ben-Sasson S, Bianco-Peled H, Kohen R. A novel role of topical iodine in skin: Activation of the Nrf2 pathway. Free Radic Biol Med 2017; 104:238-248. [PMID: 28088623 DOI: 10.1016/j.freeradbiomed.2017.01.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 12/26/2016] [Accepted: 01/06/2017] [Indexed: 12/30/2022]
Abstract
For a long time iodine has been used as an active dermal agent in the treatment of inflammatory, immune-mediated and infectious diseases. Moreover, topical iodine application has been reported to provide protection against sulfur-mustard-induced skin lesions, heat-induced and acid-induced skin burns in both haired guinea-pigs and mouse ear swelling models. However, the exact mechanism of action underlying these benefits of iodine has not yet been elucidated. In the current study, a novel mechanism of action by which iodine provides skin protection and relief, based on its electrophilic nature, is suggested. This study demonstrates that both iodine and iodide are capable of activating the Nrf2 pathway in human skin. As a result, skin protection against UVB-induced damage was acquired and the secretion of pro-inflammatory cytokines (IL-6, IL-8) from LPS-challenged skin was reduced. Iodide role in the enhanced activation of this pathway is demonstrated. The mode of action by which iodine and iodide activate the Nrf2 pathway is discussed.
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Affiliation(s)
- Maya Ben-Yehuda Greenwald
- The Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem 9112100, Israel; Department of Chemical Engineering, Technion-Israel Institute of Technology, Technion City, Haifa 3200003, Israel; The Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel; Department of Developmental Biology and Cancer Research, The Hebrew University Medical School, Ein-Karem Campus, Jerusalem 9112100, Israel
| | - Marina Frušić-Zlotkin
- The Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem 9112100, Israel
| | - Yoram Soroka
- The Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem 9112100, Israel
| | - Shmuel Ben-Sasson
- Department of Developmental Biology and Cancer Research, The Hebrew University Medical School, Ein-Karem Campus, Jerusalem 9112100, Israel
| | - Havazelet Bianco-Peled
- Department of Chemical Engineering, Technion-Israel Institute of Technology, Technion City, Haifa 3200003, Israel; The Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Ron Kohen
- The Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem 9112100, Israel.
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Ginsburg I, Koren E, Varani J, Kohen R. Nuclear histones: major virulence factors or just additional early sepsis markers? A comment. Inflammopharmacology 2016; 24:287-289. [DOI: 10.1007/s10787-016-0279-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 08/29/2016] [Indexed: 01/31/2023]
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22
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Goldstein A, Soroka Y, Frušić-Zlotkin M, Lewis A, Kohen R. The bright side of plasmonic gold nanoparticles; activation of Nrf2, the cellular protective pathway. Nanoscale 2016; 8:11748-11759. [PMID: 27224746 DOI: 10.1039/c6nr02113a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Plasmonic gold nanoparticles (AuNPs) are widely investigated for cancer therapy, due to their ability to strongly absorb light and convert it to heat and thus selectively destroy tumor cells. In this study we shed light on a new aspect of AuNPs and their plasmonic excitation, wherein they can provide anti-oxidant and anti-inflammatory protection by stimulating the cellular protective Nrf2 pathway. Our study was carried out on cells of the immune system, macrophages, and on skin cells, keratinocytes. A different response to AuNPs was noted in the two types of cells, explained by their distinct uptake profiles. In keratinocytes, the exposure to AuNPs, even at low concentrations, was sufficient to activate the Nrf2 pathway, without any irradiation, due to the presence of free AuNPs inside the cytosol. In contrast, in macrophages, the plasmonic excitation of the AuNPs by a low, non-lethal irradiation dose was required for their release from the constraining vesicles. The mechanism by which AuNPs activate the Nrf2 pathway was studied. Direct and indirect activation were suggested, based on the inherent ability of the AuNPs to react with thiol groups and to generate reactive oxygen species, in particular, under plasmonic excitation. The ability of AuNPs to directly activate the Nrf2 pathway renders them good candidates for treatment of disorders in which the up-regulation of Nrf2 is beneficial, specifically for topical treatment of inflammatory skin diseases.
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Affiliation(s)
- Alona Goldstein
- The David and Ines Myers Skin Research Laboratory, The Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem 9112100, Israel. and Department of Applied Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Yoram Soroka
- The David and Ines Myers Skin Research Laboratory, The Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem 9112100, Israel.
| | - Marina Frušić-Zlotkin
- The David and Ines Myers Skin Research Laboratory, The Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem 9112100, Israel.
| | - Aaron Lewis
- Department of Applied Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Ron Kohen
- The David and Ines Myers Skin Research Laboratory, The Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem 9112100, Israel.
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23
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Sirota R, Gibson D, Kohen R. The role of the catecholic and the electrophilic moieties of caffeic acid in Nrf2/Keap1 pathway activation in ovarian carcinoma cell lines. Redox Biol 2014; 4:48-59. [PMID: 25498967 PMCID: PMC4309848 DOI: 10.1016/j.redox.2014.11.012] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Accepted: 11/29/2014] [Indexed: 01/19/2023] Open
Abstract
In recent years, numerous studies have demonstrated the health benefits of polyphenols. A major portion of polyphenols in western diet are derived from coffee, which is one of the most consumed beverages in the world. It has been shown that many polyphenols gain their beneficial properties (e.g. cancer prevention) through the activation of the Nrf2/Keap1 pathway as well as their direct antioxidant activity. However, activation of Nrf2 in cancer cells might lead to resistance towards therapy through induction of phase II enzymes. In the present work we hypothesize that caffeic acid (CA), a coffee polyphenol, might act as an electrophile in addition to its nucleophilic properties and is capable of inducing the Nrf2/EpRE pathway in cancer cells. The results indicate that CA induces Nrf2 translocation into the nucleus and consequently its transcription. It has been demonstrated that generated hydrogen peroxide is involved in the induction process. It has also been found that this process is induced predominantly via the double bond in CA (Michael acceptor). However, surprisingly the presence of both nucleophilic and electrophilic moieties in CA resulted in a synergetic activation of Nrf2 and phase II enzymes. We also found that CA possesses a dual activity, although inducing GSTP1 and GSR, it inhibiting their enzymatic activity. In conclusion, the mechanism of induction of Nrf2 pathway and phase II enzymes by CA has been elucidated. The electrophilic moiety in CA is essential for the oxidation of the Keap1 protein. It should be noted that while the nucleophilic moiety (the catechol/quinone moiety) can provide scavenging ability, it cannot contribute directly to Nrf2 induction. It was found that this process may be induced by H2O2 produced by the catechol group. On the whole, it appears that CA might play a major role in the cancer cells by enhancing their resistance to treatment. The electrophilic moiety in CA is essential for the oxidation of the Keap1 protein. The nucleophilic moiety contribute to Nrf2/Keap1 activation via production of H2O2. CA possesses a dual activity, as inducer and as inhibitor of GSTP1 and GSR1. The effect of coffee on healthy subjects and cancer patients may be different.
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Affiliation(s)
- R Sirota
- Faculty of Medicine, Institute for Drug Research, Hebrew University of Jerusalem, Israel
| | - D Gibson
- Faculty of Medicine, Institute for Drug Research, Hebrew University of Jerusalem, Israel
| | - R Kohen
- Faculty of Medicine, Institute for Drug Research, Hebrew University of Jerusalem, Israel.
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Greenwald MBY, Anzi S, Ben Sasson S, Bianco-Peled H, Kohen R. Can nitroxides evoke the Keap1-Nrf2-ARE pathway in skin? Free Radic Biol Med 2014; 77:258-69. [PMID: 25236737 DOI: 10.1016/j.freeradbiomed.2014.08.021] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Revised: 07/29/2014] [Accepted: 08/20/2014] [Indexed: 01/14/2023]
Abstract
Nitroxides are stable cyclic radicals of diverse size, charge, and lipophilicity. They are cell-permeative, which effectively protects cells, tissues, isolated organs, and laboratory animals from radical-induced damage. The mechanisms of activity through which nitroxides operate are diverse, including superoxide dismutase-mimetic activity, oxidation of semiquinone radicals, oxidation of reduced metal ions, procatalase-mimetic activity, interruption of radical chain reactions, and indirect modulation of NO levels. Nitroxides possess both a nucleophilic (reducing properties) and an electrophilic (oxidizing properties) nature and, therefore, they may affect different cellular pathways. In the current study, a novel mechanism of action by which nitroxides provide skin protection based on their electrophilic nature is suggested. This study shows that nitroxides may act as electrophiles, directly or indirectly, capable of activating the Keap1-Nrf2-ARE pathway in human keratinocytes (HaCaT) and in human skin (human organ culture model). The high potency of oxoammonium cations versus hydroxylamines in activating the system is demonstrated. The mechanism of action by which nitroxides activate the Keap1-Nrf2-ARE pathway is discussed. Understanding the mechanism of activity may expand the usage of nitroxides as a skin protection strategy against oxidative stress-related conditions.
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Affiliation(s)
- Maya Ben Yehuda Greenwald
- The Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem 91120, Israel; Department of Chemical Engineering and Technion-Israel Institute of Technology, Haifa 32000, Israel; The Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel; Department of Developmental Biology and Cancer Research, The Hebrew University Medical School, Ein-Karem Campus, Jerusalem 91120, Israel
| | - Shira Anzi
- Department of Developmental Biology and Cancer Research, The Hebrew University Medical School, Ein-Karem Campus, Jerusalem 91120, Israel
| | - Shmuel Ben Sasson
- Department of Developmental Biology and Cancer Research, The Hebrew University Medical School, Ein-Karem Campus, Jerusalem 91120, Israel
| | - Havazelet Bianco-Peled
- Department of Chemical Engineering and Technion-Israel Institute of Technology, Haifa 32000, Israel; The Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Ron Kohen
- The Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem 91120, Israel.
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25
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Kohen R, Dobra A, Tracy JH, Haugen E. Transcriptome profiling of human hippocampus dentate gyrus granule cells in mental illness. Transl Psychiatry 2014; 4:e366. [PMID: 24594777 PMCID: PMC3966046 DOI: 10.1038/tp.2014.9] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Accepted: 01/06/2014] [Indexed: 12/20/2022] Open
Abstract
This study is, to the best of our knowledge, the first application of whole transcriptome sequencing (RNA-seq) to cells isolated from postmortem human brain by laser capture microdissection. We investigated the transcriptome of dentate gyrus (DG) granule cells in postmortem human hippocampus in 79 subjects with mental illness (schizophrenia, bipolar disorder, major depression) and nonpsychiatric controls. We show that the choice of normalization approach for analysis of RNA-seq data had a strong effect on results; under our experimental conditions a nonstandard normalization method gave superior results. We found evidence of disrupted signaling by miR-182 in mental illness. This was confirmed using a novel method of leveraging microRNA genetic variant information to indicate active targeting. In healthy subjects and those with bipolar disorder, carriers of a high- vs those with a low-expressing genotype of miR-182 had different levels of miR-182 target gene expression, indicating an active role of miR-182 in shaping the DG transcriptome for those subject groups. By contrast, comparing the transcriptome between carriers of different genotypes among subjects with major depression and schizophrenia suggested a loss of DG miR-182 signaling in these conditions.
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Affiliation(s)
- R Kohen
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA,Department of Psychiatry and Behavioral Sciences, University of Washington, 1959 Pacific Avenue NE, Seattle, WA 98195-6560, USA. E-mail:
| | - A Dobra
- Department of Statistics, University of Washington, Seattle, WA, USA,Department of Biobehavioral Nursing and Health Systems, University of Washington, Seattle, WA, USA,Center for Statistics and The Social Sciences, University of Washington, Seattle, WA, USA
| | - J H Tracy
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA
| | - E Haugen
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
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Rosenzweig O, Lavy E, Gati I, Kohen R, Friedman M. Development andin vitrocharacterization of floating sustained-release drug delivery systems of polyphenols. Drug Deliv 2013; 20:180-9. [DOI: 10.3109/10717544.2013.801532] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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Sirota R, Gorelik S, Harris R, Kohen R, Kanner J. Coffee polyphenols protect human plasma from postprandial carbonyl modifications. Mol Nutr Food Res 2013; 57:916-9. [DOI: 10.1002/mnfr.201200557] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2012] [Revised: 11/13/2012] [Accepted: 11/15/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Roman Sirota
- The Institute of Drug Research; Faculty of Medicine; Hebrew University of Jerusalem; Jerusalem Israel
| | - Shlomit Gorelik
- The Institute of Drug Research; Faculty of Medicine; Hebrew University of Jerusalem; Jerusalem Israel
| | - Raviv Harris
- The Institute of Drug Research; Faculty of Medicine; Hebrew University of Jerusalem; Jerusalem Israel
| | - Ron Kohen
- The Institute of Drug Research; Faculty of Medicine; Hebrew University of Jerusalem; Jerusalem Israel
| | - Joseph Kanner
- Department of Food Science; ARO; Volcani Center; Bet Dagan Israel
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Gorelik S, Kanner J, Schurr D, Kohen R. A rational approach to prevent postprandial modification of LDL by dietary polyphenols. J Funct Foods 2013. [DOI: 10.1016/j.jff.2012.09.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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30
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Affiliation(s)
- I Ginsburg
- The Faculty of Dental Medicine, Institute for Dental Sciences, Hebrew University, Hadassah Medical Center, PO Box 12065, Jerusalem, 91120, Israel.
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31
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Portugal-Cohen M, Kohen R. Non-invasive evaluation of skin cytokines secretion: an innovative complementary method for monitoring skin disorders. Methods 2012; 61:63-8. [PMID: 23063704 DOI: 10.1016/j.ymeth.2012.10.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Revised: 08/29/2012] [Accepted: 10/01/2012] [Indexed: 01/07/2023] Open
Abstract
In this review, a novel non-invasive approach based on skin surface wash sampling is described. Since the epidermis possesses a high metabolic activity, the secretion of various biomarkers can be exploited to develop non-invasive procedures for skin measurement to monitor disorders and to define a therapeutic strategy. Thus, we developed a method for the quantification of skin surface compounds. In this procedure, a well is placed on skin surface and is attached using an adhesive pad. Extraction buffer is introduced into the well for 30 min incubation period and the secretion of different biomarkers on skin surface can be measured: cytokines, antioxidants, peptides, RNA, DNA volatile organic compounds etc. Here, the focus is on cytokine measurement. After collecting skin samples cytokines can be quantified using ELISA assay. Since so far cytokine levels in skin have been evaluated mostly by invasive and prolonged procedures (punch biopsy, blister fluid and scrapping), employing this method has important implications, because it allows assessing cytokine amount with minimal invasion and high accuracy. We have already applied skin surface wash sampling for cytokine quantification in different clinical conditions: psoriasis, atopic dermatitis and chronic renal failure. A distinct pattern of cytokine secretion has been demonstrated for each disorder. Differences were also observed between lesional and non-lesional areas. The obtained results shed a new light on cutaneous cytokine expression in different clinical conditions. Moreover, the interplay between cytokines and other soluble compounds can give an added value in understanding the mechanism of skin pathologies.
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Affiliation(s)
- Meital Portugal-Cohen
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
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Kanner J, Gorelik S, Roman S, Kohen R. Protection by polyphenols of postprandial human plasma and low-density lipoprotein modification: the stomach as a bioreactor. J Agric Food Chem 2012; 60:8790-8796. [PMID: 22530973 DOI: 10.1021/jf300193g] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Recent studies dramatically showed that the removal of circulating modified low-density lipoprotein (LDL) results in complete prevention of atherosclerosis. The gastrointestinal tract is constantly exposed to food, some of it containing oxidized compounds. Lipid oxidation in the stomach was demonstrated by ingesting heated red meat in rats. Red wine polyphenols added to the rats' meat diet prevented lipid peroxidation in the stomach and absorption of malondialdehyde (MDA) in rat plasma. In humans, postprandial plasma MDA levels rose by 3-fold after a meal of red meat cutlets. MDA derived from meat consumption caused postprandial plasma LDL modification in human. The levels of plasma MDA showed a 75% reduction by consumption of red wine polyphenols during the meat meal. Locating the main biological site of action of polyphenols in the stomach led to a revision in the understanding of how antioxidants work in vivo and may help to elucidate the mechanism involved in the protective effects of polyphenols in human health.
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Affiliation(s)
- Joseph Kanner
- Department of Food Science, ARO , Volcani Center, Bet Dagan, Israel.
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Erlank H, Elmann A, Kohen R, Kanner J. Polyphenols activate Nrf2 in astrocytes via H2O2, semiquinones, and quinones. Free Radic Biol Med 2011; 51:2319-27. [PMID: 22037513 DOI: 10.1016/j.freeradbiomed.2011.09.033] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2011] [Revised: 09/27/2011] [Accepted: 09/28/2011] [Indexed: 12/20/2022]
Abstract
Polyphenols, which occur both in edible plants and in foodstuff, have been reported to exert a wide range of health effects; however, the mechanism of action of these molecules is not fully understood. One important cellular pathway affected by polyphenols is the activation of the transcription factor Nrf2 via the electrophile response element, which mediates generation of phase 2 detoxifying enzymes. Our study found that Nrf2 nuclear translocation and the activity of NAD(P)H quinone oxidoreductase (NQO1) were increased significantly after treatment of astrocytes with tert-butylhydroquinone (tBHQ), resveratrol, or curcumin, at 20-50μM. Incubation of tBHQ, resveratrol, and curcumin in the growth medium in the absence of astrocytes caused the accumulation of H(2)O(2). Treatment of cells with either glutathione or metmyoglobin was found to decrease Nrf2 translocation and NQO1 activity induced by polyphenols by up to 40 and 60%, respectively. Addition of both glutathione and metmyoglobin to growth medium decreased Nrf2 translocation and NQO1 activity by up to 100 and 80%, respectively. In conclusion, because metmyoglobin, in the presence of polyphenols and glutathione, is known to interact with H(2)O(2), semiquinones, and quinones, the up-regulation of the antioxidant defense of the cells through activation of the Nrf2 transcription factor, paradoxically, occurs via the generation of H(2)O(2) and polyphenol-oxidized species generated from the exogenous microenvironment of the cells.
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Affiliation(s)
- Hilla Erlank
- Department of Food Science, ARO, Volcani Center, Bet-Dagan 50250, Israel
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Portugal-Cohen M, Oron M, Ma’or Z, Boaz M, Shtendik L, Biro A, Cernes R, Barnea Z, Kazir Z, Kohen R. Noninvasive skin measurements to monitor chronic renal failure pathogenesis. Biomed Pharmacother 2011; 65:280-5. [DOI: 10.1016/j.biopha.2011.02.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Accepted: 02/08/2011] [Indexed: 10/18/2022] Open
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Portugal-Cohen M, Soroka Y, Frušić-Zlotkin M, Verkhovsky L, Brégégère FM, Neuman R, Kohen R, Milner Y. Skin organ culture as a model to study oxidative stress, inflammation and structural alterations associated with UVB-induced photodamage. Exp Dermatol 2011; 20:749-55. [DOI: 10.1111/j.1600-0625.2011.01317.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Kohen R, Shofer JB, Korvatska O, Petrie EC, Wang LY, Schellenberg GD, Peskind ER, Wilkinson CW. ABCB1 genotype and CSF beta-amyloid in Alzheimer disease. J Geriatr Psychiatry Neurol 2011; 24:63-6. [PMID: 21478475 PMCID: PMC3293495 DOI: 10.1177/0891988711402325] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The ABCB1 gene, coding for the efflux transporter P-glycoprotein (PGP), is a candidate gene for Alzheimer disease (AD). P-glycoprotein is heavily expressed at the blood-brain barrier, where it mediates the efflux of β-amyloid (Aβ) from the brain. In this study, we investigated a possible association between 2 common ABCB1 polymorphisms, G2677T/A (Ala893Ser/Thr) and C3435T, AD, and cerebrospinal fluid (CSF) levels of Aβ. No strong evidence for association was found.
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Affiliation(s)
- R. Kohen
- Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA, USA
| | - J. B. Shofer
- Mental Illness Research, Education, and Clinical Center (MIRECC), VA Puget Sound Health Care System, Washington, DC, USA
| | - O. Korvatska
- Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA, USA
| | - E. C. Petrie
- Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA, USA,Mental Illness Research, Education, and Clinical Center (MIRECC), VA Puget Sound Health Care System, Washington, DC, USA
| | - L. Y. Wang
- Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA, USA,Mental Illness Research, Education, and Clinical Center (MIRECC), VA Puget Sound Health Care System, Washington, DC, USA
| | - G. D. Schellenberg
- Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA, USA,Geriatric Research, Education, and Clinical Center (GRECC) Veterans Affairs (VA) Puget Sound Health Care System, Tacoma, WA, USA
| | - E. R. Peskind
- Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA, USA,Mental Illness Research, Education, and Clinical Center (MIRECC), VA Puget Sound Health Care System, Washington, DC, USA
| | - C. W. Wilkinson
- Department of Psychiatry and Behavioral Sciences, University of Washington School of Medicine, Seattle, WA, USA,Geriatric Research, Education, and Clinical Center (GRECC) Veterans Affairs (VA) Puget Sound Health Care System, Tacoma, WA, USA
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Korvatska O, Estes A, Munson J, Dawson G, Bekris LM, Kohen R, Yu CE, Schellenberg GD, Raskind WH. Mutations in the TSGA14 gene in families with autism spectrum disorders. Am J Med Genet B Neuropsychiatr Genet 2011; 156B:303-11. [PMID: 21438139 PMCID: PMC3552624 DOI: 10.1002/ajmg.b.31162] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2010] [Accepted: 11/30/2010] [Indexed: 11/11/2022]
Abstract
Linkage to 7q has been the most robust genetic finding in familial autism. A previous scan of multiplex families with autism spectrum disorders found a linkage signal of genome-wide significance at D7S530 on 7q32. We searched a candidate imprinted region at this location for genetic variants in families with positive linkage scores. Using exon resequencing, we identified three rare potentially pathogenic variants in the TSGA14 gene, which encodes a centrosomal protein. Two variants were missense mutations (c.664C>G; p.P206A and c.766T>G; p.C240G) that changed conserved residues in the same protein domain; the third variant (c.192+5G>A) altered splicing, which resulted in a protein with an internal deletion of 16 residues and a G33D substitution. These rare TSGA14 variants are enriched in the affected subjects (6/348 patients versus 2/670 controls, Fisher's exact two tailed P = 0.022). This is the first report of a possible link of a gene with a centrosomal function with familial autism.
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Affiliation(s)
- O Korvatska
- Division of Medical Genetics, Department of Medicine, University of Washington, Seattle, 98195, USA.
| | - A Estes
- Department of Speech and Hearing Sciences, University of Washington, Seattle, WA, USA
| | - J Munson
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA
| | - G Dawson
- Autism Speaks, New York, NY, USA,Department of Psychiatry, University of North Carolina, Chapel Hill, NC, USA
| | - L M Bekris
- Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington, Seattle, WA, USA
| | - R Kohen
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA
| | - C-E Yu
- Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington, Seattle, WA, USA
| | - G D Schellenberg
- Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
| | - W H Raskind
- Division of Medical Genetics, Department of Medicine, University of Washington, Seattle, WA, USA,Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA
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Ginsburg I, Kohen R, Koren E. Microbial and host cells acquire enhanced oxidant-scavenging abilities by binding polyphenols. Arch Biochem Biophys 2010; 506:12-23. [PMID: 21081104 DOI: 10.1016/j.abb.2010.11.009] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2010] [Revised: 11/09/2010] [Accepted: 11/09/2010] [Indexed: 12/14/2022]
Abstract
The dilemma whether supplementations of dietary antioxidants might prevent the adverse consequences of oxidative stress, the inadequacy of the analytical methods employed to quantify oxidant scavenging ability (OSA) levels in whole blood and the distribution and fate of polyphenols and their metabolites in various body compartments following oral consumption are discussed. While none-metabolized polyphenols might exert their antioxidant effects mainly in the oral cavity, metabolized polyphenols might be beneficial in the gastrointestinal tract to counteract the toxicity of oxidants and also of the sequelae of inflammatory processes. Although only micromolar amounts of polyphenols and their metabolites eventually reach the blood circulation, these may nevertheless still be highly effective as scavengers of reactive oxygen and nitrogen species because of their ability to synergize with plasma low molecular-weight antioxidants and with albumin. Polyphenols can avidly bind to surfaces of microorganisms and of blood cells to markedly enhance their OSA, therefore the routine quantifications of antioxidant levels conducted in clinical settings should always use catalase-rich whole blood but not as customary, plasma alone. In addition to their antioxidant and metal chelating properties, polyphenols may also act as signaling agents capable of affecting metabolic, inflammatory, autoimmune, carcinogenic and aging processes.
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Affiliation(s)
- Isaac Ginsburg
- The Faculty of Dental Medicine, Institute for Dental Sciences, Hebrew University, Hadassah Medical Center, P.O. Box 12065, Jerusalem 91120, Israel.
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Numa R, Baron M, Kohen R, Yaka R. Tempol attenuates cocaine-induced death of PC12 cells through decreased oxidative damage. Eur J Pharmacol 2010; 650:157-62. [PMID: 20969850 DOI: 10.1016/j.ejphar.2010.10.024] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Revised: 10/12/2010] [Accepted: 10/12/2010] [Indexed: 11/28/2022]
Abstract
The association between cocaine administration and induction of oxidative stress in different brain regions suggests that oxidative damage is an important factor participating in cocaine disruption of normal central nervous system functions. In order to deal with this topic, brain penetrating exogenous antioxidants were suggested as a tool to prevent cocaine-induced oxidative damage and behavioral changes. Lately, we have shown that Tempol, a stable nitroxide radical reduced oxidative damage and attenuated the development and expression of cocaine psychomotor sensitization. To examine whether nitroxides, represented by Tempol, can exhibit protective effects against cocaine-induced cell death and to elucidate the molecular mechanism of cocaine-induced oxidative damage, we used the well established PC12 cell line model. The results showed that (1) cocaine induced cell death in a dose-dependent manner (2) and that it was reduced significantly by the stable nitroxide radical Tempol. Furthermore, (3) Tempol significantly inhibited oxidative damage induced by cocaine as reflected by mitochondrial superoxide radical and peroxide enhancement. Finally, (4) Tempol restored the total scavenging capacity which was reduced by cocaine in PC12 cells. Cumulatively, these results suggest that nitroxides such as Tempol can attenuate oxidative damage and cell death induced by cocaine and that PC12 cells can be used as an in vitro model to further investigate the precise molecular mechanism of these compounds.
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Affiliation(s)
- Ran Numa
- Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
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Koren E, Kohen R, Ginsburg I. Polyphenols enhance total oxidant-scavenging capacities of human blood by binding to red blood cells. Exp Biol Med (Maywood) 2010; 235:689-99. [DOI: 10.1258/ebm.2010.009370] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The present study offers a new look at the role of erythrocytes and of erythrocytes–polyphenol complexes as potent ‘sinks’ for reactive oxygen species. We hereby show that human erythrocytes have the capacity not only to carry oxygen, but also to bind avidly to their surfaces a large variety of polyphenol antioxidants, which endows upon such complexes enhanced total oxidant-scavenging capacities (TOSC). This was proven by using confocal microscopy, 2,2-diphenyl-1-picrylhydrazyl radical, Folin-Ciocalteu's reagent, cyclic voltammetry and chemiluminescence techniques. The results presented suggest that the true TOSC of blood is the sum of intracellular antioxidants of red blood cells and other blood cells (mainly due to catalase), the polyphenols bound to their surfaces and the antioxidant agents present in plasma. Since erythrocytes can avidly bind and rapidly remove circulating polyphenols, the rule of the thumb to quantify antioxidants in health and disease processes exclusively in plasma as customary in clinical settings, does not represent the true TOSC of whole blood. We also postulate that circulating erythrocytes and possibly also other blood cells might be constantly coated by polyphenols from supplemented nutrients, which act as antioxidant depots and can thus act as protectors against the harmful consequences of oxidative stress. Further studies are needed to determine the faith of polyphenols in the circulation and their sequestration in the spleen.
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Affiliation(s)
- Erez Koren
- Department of Pharmaceutics, School of Pharmacy, Richard and Jean Zarbin Chair in Medical Studies, Hadassah Faculty of Medicine, Hebrew University, Ein Kerem Campus, Jerusalem 91120
- Faculty of Dental Medicine, Institute for Dental Sciences, Hadassah Medical Center, Hebrew University, PO Box 12065, Jerusalem91120, Israel
| | - Ron Kohen
- Department of Pharmaceutics, School of Pharmacy, Richard and Jean Zarbin Chair in Medical Studies, Hadassah Faculty of Medicine, Hebrew University, Ein Kerem Campus, Jerusalem 91120
| | - Isaac Ginsburg
- Faculty of Dental Medicine, Institute for Dental Sciences, Hadassah Medical Center, Hebrew University, PO Box 12065, Jerusalem91120, Israel
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Abstract
Milk is one of the most fundamental ingredients in our diet. It is a complex biological fluid, which contains numerous substances, ranging from metal ions to enzymes. There is a constant search for an improved way of monitoring its quality and freshness. These are highly affected by the redox state of milk, which is governed by different species. In this study, we investigated the redox state and capacity of milk. Specifically, milk was potentiometrically titrated using different redox mediators, which enabled facilitation of electron transfer between different oxidizable species and the electrode. We found that the iodine/iodide redox couple was superior for measuring the redox capacity of milk. These measurements revealed that milk is not a well-poised system due to the presence of at least two different oxidizable species, one of which is hydrophobic while the other is hydrophilic and therefore could be separated by phase separation of milk.
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Affiliation(s)
- Tomer Noyhouzer
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
- Department of Pharmaceutics, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem, 91120, Israel
| | - Ron Kohen
- Department of Pharmaceutics, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem, 91120, Israel
| | - Daniel Mandler
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
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Koren E, Lipkin J, Klar A, Hershkovitz E, Ginsburg I, Kohen R. Total oxidant-scavenging capacities of plasma from glycogen storage disease type Ia patients as measured by cyclic voltammetry, FRAP and luminescence techniques. J Inherit Metab Dis 2009; 32:651. [PMID: 19728140 DOI: 10.1007/s10545-009-1242-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2009] [Revised: 07/09/2009] [Accepted: 07/13/2009] [Indexed: 12/14/2022]
Abstract
It has been suggested that the very low incidence of atherosclerosis in glycogen storage disease type Ia (GSD Ia) subjects might be attributed to elevated levels of uric acid, one of the potent low molecular- weight antioxidants found in plasma. The present communication describes a use of two analytical methods-cyclic voltammetry and ferric reducing ability of plasma-and also two chemiluminescence methods to evaluate the total oxidant-scavenging capacities (TOSC) of plasma from GSD Ia patients. Our results verified the elevation of TOSC in GSD Ia patients and we propose the inclusion of luminescence and cyclic voltammetry assays as reliable methods for estimating TOSC in a variety of clinical disorders. Our findings with the cyclic voltammetry method add support to the assumption that the elevated uric acid levels might be the main contributor to plasma antioxidant capacity and possible protection against atherosclerosis.
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Affiliation(s)
- E Koren
- Department of Pharmaceutics, School of Pharmacy, Richard and Jean Zarbin Chair in Medical Studies, Hebrew University, Hadassah Faculty of Medicine, Jerusalem, 91120, Israel
| | - J Lipkin
- Department of Pediatrics, Bikur Cholim General Hospital, Jerusalem, Israel
| | - A Klar
- Department of Pediatrics, Bikur Cholim General Hospital, Jerusalem, Israel
| | - E Hershkovitz
- Pediatric Endocrinology & Metabolic Unit, Soroka Medical University Center, Beer Sheva, Israel
| | - I Ginsburg
- Faculty of Dental Medicine, Institute for Dental Sciences, Hebrew University, Hadassah Medical Center, Jerusalem, Israel
| | - R Kohen
- Department of Pharmaceutics, School of Pharmacy, Richard and Jean Zarbin Chair in Medical Studies, Hebrew University, Hadassah Faculty of Medicine, Jerusalem, 91120, Israel.
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Abstract
A novel assay was developed to measure the capacity of polyphenols to chelate cobalt(II) by using the reduction of the tetrazolium salts, NBT (nitroblue tetrazolium chloride), MTT (methylthiazolyldiphenyl-tetrazolium bromide), and XTT (2,3-bis[2-methoxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-carboxanilide) to formazan products. The reduction of the salts is initiated by a cocktail comprised of cobalt(II), H(2)O(2), and selenium(IV), which generates hydroxyl radical, peroxide, and superoxide ions. However, because cobalt(II) could not be replaced either by Fe(II), Mn(II), or Cu(II), the classical Fenton transitional metals, it indicates that cobalt is the key player in the tetrazolium salt reduction. Micromolar concentrations of a large variety of antioxidant polyphenols and minute amounts of fruit beverages rich in polyphenols can readily chelate cobalt, resulting in the inhibition of the reduction of tetrazolium salt to formazan, in a dose-dependent manner. However, this method is unsuitable to measure low molecular weight antioxidants such as ascorbate, uric acid, and vitamin E since these have no chelating properties for cobalt(II). The newly described tetrazolium reduction method is as sensitive as the ferric ion reducing antioxidant power, 2,2-diphenyl-2-picrylhydrazyl hydrate, and the luminol-dependent chemiluminescence antioxidant assays. The practical advantages of using the newly described method to quantify polyphenol levels from various sources are briefly discussed.
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Affiliation(s)
- Erez Koren
- The Faculty of Dental Medicine, Institute for Dental Sciences, Hebrew University, Hadassah Medical Center, Jerusalem 91120, Israel
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Portugal-Cohen M, Soroka Y, Ma’or Z, Oron M, Zioni T, Brégégère FM, Neuman R, Kohen R, Milner Y. Protective effects of a cream containing Dead Sea minerals against UVB-induced stress in human skin. Exp Dermatol 2009; 18:781-8. [DOI: 10.1111/j.1600-0625.2009.00865.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Volk J, Gorelik S, Granit R, Kohen R, Kanner J. The dual function of nitrite under stomach conditions is modulated by reducing compounds. Free Radic Biol Med 2009; 47:496-502. [PMID: 19375499 DOI: 10.1016/j.freeradbiomed.2009.04.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2009] [Revised: 04/07/2009] [Accepted: 04/09/2009] [Indexed: 11/22/2022]
Abstract
Salivary nitrite plays a role in the lipid peroxidation process of muscle tissue in simulated gastric fluid. The objectives of our study were to elucidate the fate of nitrite in the presence of reducing compounds and to evaluate its effect on lipid peroxidation during digestion. Nitrite at pH 3 (possibly NO(2.), not NO.) can oxidize beta-carotene, but the addition of reducing compounds, ascorbic acid or polyphenols, alters its effect. Ascorbic acid alone promoted the formation of NO. from nitrite only up to pH 3, but the addition of iron ions facilitated the formation of NO. up to pH 5.5. NO prevented membranal lipid peroxidation under stomach conditions. Nitrite, only in the presence of reducing compounds, achieved the same goal but at much higher concentrations. Addition of polyphenols to nitrite synergistically improved its antioxidant effect. Therefore, to promote NO. production and to achieve better control of the lipid peroxidation process in the stomach, a nitrite-rich meal should be consumed simultaneously with food rich in polyphenols.
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Affiliation(s)
- J Volk
- Department of Food Science, ARO, The Volcani Center, Bet Dagan 50250, Israel
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Portugal-Cohen M, Kohen R. Exposure of human keratinocytes to ischemia, hyperglycemia and their combination induces oxidative stress via the enzymes inducible nitric oxide synthase and xanthine oxidase. J Dermatol Sci 2009; 55:82-90. [DOI: 10.1016/j.jdermsci.2009.05.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2009] [Revised: 04/26/2009] [Accepted: 05/09/2009] [Indexed: 10/20/2022]
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Boaz M, Shtendik L, Oron M, Portugal-Cohen M, Kohen R, Biro A, Cernes R, Barnea Z, Maor Z, Katzir Z. A Randomized Controlled Clinical Trial Comparing the Efficacy of Dead Sea Mineral-Enriched Body Lotion versus Two Types of Placebo in the Treatment of Cutaneous Dryness, Itching, Peeling and Tightness in Hemodialysis Patients (EDIT). ACTA ACUST UNITED AC 2009; 113:c169-76. [DOI: 10.1159/000232598] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2009] [Accepted: 03/18/2009] [Indexed: 11/19/2022]
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Arien-Zakay H, Lecht S, Bercu MM, Tabakman R, Kohen R, Galski H, Nagler A, Lazarovici P. Neuroprotection by cord blood neural progenitors involves antioxidants, neurotrophic and angiogenic factors. Exp Neurol 2008; 216:83-94. [PMID: 19070617 DOI: 10.1016/j.expneurol.2008.11.006] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2008] [Revised: 11/06/2008] [Accepted: 11/14/2008] [Indexed: 12/31/2022]
Abstract
Human umbilical cord blood (HUCB) is a valuable source for cell therapy since it confers neuroprotection in stroke animal models. However, the responsible sub-populations remain to be established and the mechanisms involved are unknown. To explore HUCB neuroprotective properties in a PC12 cell-based ischemic neuronal model, we used an HUCB mononuclear-enriched population of collagen-adherent cells, which can be differentiated in vitro into a neuronal phenotype (HUCBNP). Upon co-culture with insulted-PC12 cells, HUCBNP conferred approximately 30% neuroprotection, as evaluated by decreased lactate dehydrogenase and caspase-3 activities. HUCBNP decreased by 95% the level of free radicals in the insulted-PC12 cells, in correlation with the appearance of antioxidants, as measured by changes in the oxidation-reduction potential of the medium using cyclic-voltammetry. An increased level of nerve growth factor (NGF), vascular endothelial growth factor and basic fibroblast growth factor in the co-culture medium was temporally correlated with a -medium neuroprotection effect, which was partially abolished by heat denaturation. HUCBNP-induced neuroprotection was correlated with changes in gene expression of these neurotrophic factors, while blocked by K252a, an antagonist of the TrkA/NGF receptor. These findings indicate that HUCBNP-induced neuroprotection involves antioxidant(s) and neurotrophic factors, which, by paracrine and/or autocrine interactions between the insulted-PC12 and the HUCBNP cells, conferred neuroprotection.
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Affiliation(s)
- Hadar Arien-Zakay
- Department of Pharmacology and Experimental Therapeutics, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
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Ryu S, Ornoy A, Samuni A, Zangen S, Kohen R. Oxidative stress in Cohen diabetic rat model by high-sucrose, low-copper diet: inducing pancreatic damage and diabetes. Metabolism 2008; 57:1253-61. [PMID: 18702952 DOI: 10.1016/j.metabol.2008.04.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2007] [Accepted: 04/22/2008] [Indexed: 02/02/2023]
Abstract
Increased oxidative stress contributes to the development and progression of both types of diabetes mellitus (DM) and its complications. In the Cohen diabetic (CD) rats, a known genetic model of nutritionally induced type 2 DM, a high-sucrose, low-copper diet (HSD) induces within 4 weeks DM in the sensitive (CDs) rats but not in the resistant (CDr) rats. To assess the possible involvement of oxidative stress in the induction of DM, we studied the effect of HSD on the tissue levels of antioxidants and the extent of oxidative injuries in these animals in comparison with the regular outbred strain of nondiabetic Sabra rats. The specific aims were to investigate, at the onset of HSD-induced DM, (1) the extent of oxidative injury, as reflected by levels of malondialdehyde and protein carbonyl groups; (2) the overall antioxidant capacities to cope with increased oxidative stress; and (3) the modification of oxidative damage biomarkers in various tissues of CDr, CDs, and Sabra rats. Female CDs, CDr, and Sabra rats were fed regular diet or HSD for 4 to 5 weeks; and several parameters of oxidative injuries and antioxidant levels were determined. Changes in the levels of nonenzymatic low-molecular weight antioxidants (LMWAs) were measured by cyclic voltammetry and oxygen radical absorbance capacity. The activities of the antioxidant enzymes superoxide dismutase and catalase were measured. Oxidative damage was evaluated by measuring lipid peroxidation and protein oxidation. (1) In all animals fed HSD, the levels of LMWAs were decreased in most organs, although not plasma. (2) A significant difference was consistently found in antioxidant enzymes' activities in the pancreas of HSD-fed CDs rats, but not in other tissues. (3) The activities of superoxide dismutase and catalase and the levels of malondialdehyde and protein carbonyl group increased, whereas the levels of LMWAs decreased, in the pancreas of HSD-fed CDs rats. In the CD rats that develop DM when fed HSD, the pancreas showed susceptibility to oxidative stress-induced injuries. Thus, enhanced oxidative stress seems to play a role in the pathogenesis of DM in this strain.
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Affiliation(s)
- Seonghun Ryu
- Department of Anatomy and Cell Biology, Laboratory of Teratology, Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
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