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de Arriba M, Borel N, LeibundGut-Landmann S. Water-filtered infrared A irradiation exerts antifungal effects on the skin fungus Malassezia. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2024; 255:112909. [PMID: 38669741 DOI: 10.1016/j.jphotobiol.2024.112909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 03/26/2024] [Accepted: 04/15/2024] [Indexed: 04/28/2024]
Abstract
Many common skin diseases are associated with changes in the microbiota. This applies for the commensal yeast Malassezia, which is linked to a wide range of skin disorders ranging from mild dandruff to severe seborrheic and atopic dermatitis, all of which have a detrimental impact on the individuals' quality of life. While antifungal medications offer relief in many cases, the challenges of disease recurrence and the emergence of resistance to the limited range of available antifungal drugs poses a pressing need for innovative therapeutic options. Here we examined the activity of water-filtered infrared A (wIRA) irradiation against Malassezia. wIRA's antimicrobial and wound healing properties make it an attractive option for localized, non-invasive, and contact-free treatment of superficial skin infections. Irradiation of Malassezia furfur with wIRA (570-1400 nm) resulted in a reduction of the yeast's metabolic activity. When put in contact with immune cells, wIRA-irradiated M. furfur was recovered at lower counts than non-irradiated M. furfur. Likewise, wIRA irradiation of M. furfur put in contact with keratinocytes, the primary host interface of the fungus in the skin, reduced the fungal counts, while the keratinocytes were not affected by the irradiation. The combination of wIRA with the photosensitizer methyl aminolevulinate exerted an additional antifungal effect on M. furfur, irrespective of the presence or absence of keratinocytes, suggesting an enhancement of the treatment effect when used in combination. These findings suggest that wIRA holds promise as a potential therapy for skin disorders associated with Malassezia.
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Affiliation(s)
- Magdalena de Arriba
- Section of Immunology, Vetsuisse-Faculty, University of Zurich, Winterthurerstrasse 260, CH-8057 Zürich, Switzerland; Institute of Veterinary Pathology, Vetsuisse-Faculty, University of Zurich, Winterthurerstrasse 268, CH 8057 Zürich, Switzerland
| | - Nicole Borel
- Institute of Veterinary Pathology, Vetsuisse-Faculty, University of Zurich, Winterthurerstrasse 268, CH 8057 Zürich, Switzerland
| | - Salomé LeibundGut-Landmann
- Section of Immunology, Vetsuisse-Faculty, University of Zurich, Winterthurerstrasse 260, CH-8057 Zürich, Switzerland; Institute of Experimental Immunology, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
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López-Cárdenas MT, Jiménez A, Espinosa-Montesinos A, Maldonado-Alvarado E, Osorio-Peralta MO, Martinez-Escobar A, Moreno-Vázquez A, Aguilera-Arreola MG, Ramón-Gallegos E. Elimination of Human Papillomavirus and Cervical Pathological Microbiota with Photodynamic Therapy in Women from Mexico City with Cervical Intraepithelial Neoplasia I. Photochem Photobiol 2023; 99:1468-1475. [PMID: 36773299 DOI: 10.1111/php.13791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 02/07/2023] [Indexed: 02/12/2023]
Abstract
Cervical carcinoma (CC) is the second cause of cancer death in Mexican women. It starts with premalignant lesions known as Intraepithelial Cervical Neoplasia (CIN) that can develop due to infection by Human Papillomavirus (HPV) and other microorganisms. Current CIN therapy involves invasive methods that affect cervix integrity and fertility; we propose the use of photodynamic therapy (PDT) as a strategy with few side effects. In this work, the effectiveness of PDT for CIN I, HPV and pathogenic vaginal microbiota elimination in 29 women of Mexico City with CIN I, CIN I + HPV and HPV diagnosis was determined. After 6 months of PDT application, HPV infection was eliminated in 100% of the patients (P < 0.01), CIN I + HPV in 64.3% (P < 0.01) and CIN I in 57.2% (P > 0.05). PDT also eliminated pathogenic microorganisms: Chlamydia trachomatis in 81% of the women (P < 0.001) and Candida albicans in 80% (P < 0.05), without affecting normal microbiota since Lactobacillus iners was eliminated only in 5.8% of patients and the opportunistic Gardnerella vaginalis in 20%. These results show that PDT was highly effective in eradicating HPV and pathogenic microorganisms, suggesting that PDT is a promising therapy for cervical infections.
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Affiliation(s)
- María Teresa López-Cárdenas
- Laboratorio de Citopatología Ambiental, Departamento de Morfología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Ciudad de México, Mexico
| | - Adriana Jiménez
- División de Investigación, Hospital Juárez de México, Ciudad de México, Mexico
| | | | - Elizabeth Maldonado-Alvarado
- Laboratorio de Citopatología Ambiental, Departamento de Morfología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Ciudad de México, Mexico
| | | | - Alejandro Martinez-Escobar
- Laboratorio de Citopatología Ambiental, Departamento de Morfología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Ciudad de México, Mexico
| | - Alejandra Moreno-Vázquez
- Departamento de Patología, Hospital de Cardiología, Centro Médico Nacional Siglo XXI, Mexico City, Mexico
| | - Ma Guadalupe Aguilera-Arreola
- Laboratorio de Bacteriología Médica, Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas-Instituto Politécnico Nacional, Mexico City, Mexico
| | - Eva Ramón-Gallegos
- Laboratorio de Citopatología Ambiental, Departamento de Morfología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Ciudad de México, Mexico
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Kuratli J, Leonard CA, Frohns A, Schoborg R, Piazena H, Borel N. Refinement of water-filtered infrared A (wIRA) irradiations of in vitro acute and persistent chlamydial infections. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2022; 234:112533. [PMID: 35914465 DOI: 10.1016/j.jphotobiol.2022.112533] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 06/23/2022] [Accepted: 07/20/2022] [Indexed: 06/15/2023]
Abstract
Water-filtered infrared A (wIRA) alone or in combination with visible light (VIS) exerts anti-chlamydial effects in vitro and in vivo in acute infection models. However, it has remained unclear whether reduced irradiation duration and irradiance would still maintain anti-chlamydial efficacy. Furthermore, efficacy of this non-chemical treatment option against persistent (chronic) chlamydial infections has not been investigated to date. To address this knowledge gap, we evaluated 1) irradiation durations of 5, 15 or 30 min in genital and ocular Chlamydia trachomatis acute infection models, 2) irradiances of 100, 150 or 200 mW/cm2 in the acute genital infection model and 3) anti-chlamydial activity of wIRA and VIS against C. trachomatis serovar B and E with amoxicillin (AMX)- or interferon γ (IFN-γ)-induced persistence. Reduction of irradiation duration reduced anti-chlamydial efficacy. Irradiances of 150 to 200 mW/cm2, but not 100 mW/cm2, induced anti-chlamydial effects. For persistent infections, wIRA and VIS irradiation showed robust anti-chlamydial activity independent of the infection status (persistent or recovering), persistence inducer (AMX or IFN-γ) or chlamydial strain (serovar B or E). This study clarifies the requirement of 30 min irradiation duration and 150 mW/cm2 irradiance to induce significant anti-chlamydial effects in vitro, supports the use of irradiation in the wIRA and VIS spectrum as a promising non-chemical treatment for chlamydial infections and provides important information for follow-up in vivo studies. Notably, wIRA and VIS exert anti-chlamydial effects on persistent chlamydiae which are known to be refractory to antibiotic treatment.
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Affiliation(s)
- Jasmin Kuratli
- Institute of Veterinary Pathology (IVPZ) and Center for Applied Biotechnology and Molecular Medicine (CABMM), Vetsuisse Faculty, University of Zürich, Winterthurerstrasse 268, 8057 Zürich, Switzerland; Graduate School for Cellular and Biomedical Sciences (GCB), University of Bern, Mittelstrasse 43, 3012 Bern, Switzerland.
| | - Cory Ann Leonard
- Institute of Veterinary Pathology (IVPZ) and Center for Applied Biotechnology and Molecular Medicine (CABMM), Vetsuisse Faculty, University of Zürich, Winterthurerstrasse 268, 8057 Zürich, Switzerland.
| | - Antonia Frohns
- Plant membrane biophysics, Technical University of Darmstadt, Schnittspahnstrasse 3, 64287 Darmstadt, Germany
| | - Robert Schoborg
- Department of Medical Education and Center for Infectious Disease, Inflammation and Immunity, Quillen College in Medicine, East Tennessee State University, PO Box 70582, Johnson City, TN 37614, USA.
| | - Helmut Piazena
- Department of Anaesthesiology and Operative Intensive Care Medicine, Charité - Universitätsmedizin Berlin, Corporative Member of Freie Universität Berlin and Humboldt Universität zu Berlin, Berlin, Germany.
| | - Nicole Borel
- Institute of Veterinary Pathology (IVPZ) and Center for Applied Biotechnology and Molecular Medicine (CABMM), Vetsuisse Faculty, University of Zürich, Winterthurerstrasse 268, 8057 Zürich, Switzerland.
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Frohns A, Stojanovic M, Barisani-Asenbauer T, Kuratli J, Borel N, Inic-Kanada A. Effects of water-filtered infrared A and visible light (wIRA/VIS) radiation on heat- and stress-responsive proteins in the retina and cornea of guinea pigs. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2021; 224:112306. [PMID: 34562830 DOI: 10.1016/j.jphotobiol.2021.112306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 08/27/2021] [Accepted: 09/09/2021] [Indexed: 10/20/2022]
Abstract
Water-filtered infrared A and visible light (wIRA/VIS), shown to reduce chlamydial infections in vitro and in vivo, might represent an innovative therapeutic approach against trachoma, a neglected tropical disease caused by ocular infection with the bacterium C. trachomatis. In this in vivo study, we assessed the impact of wIRA radiation in combination with VIS (wavelength range 595-1400 nm, intensity 2100 W/m2) on the retina and cornea in a guinea pig animal model of inclusion conjunctivitis. We investigated the effects 19 days after wIRA/VIS irradiation by comparing a single and double wIRA/VIS treatment with a sham control. By immunolabeling and western blot analyses of critical heat- and stress-responsive proteins, we could not detect wIRA/VIS-induced changes in their expression pattern. Also, immunolabeling of specific retinal marker proteins revealed no changes in their expression pattern caused by the treatment. Our preclinical study suggests wIRA/VIS as a promising and safe therapeutic tool to treat ocular chlamydial infections.
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Affiliation(s)
| | | | - Talin Barisani-Asenbauer
- Institute of Specific Prophylaxis and Tropical Medicine, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Jasmin Kuratli
- Institute of Veterinary Pathology, (IVPZ) and Center for Applied Biotechnology and Molecular Medicine (CABMM), Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Nicole Borel
- Institute of Veterinary Pathology, (IVPZ) and Center for Applied Biotechnology and Molecular Medicine (CABMM), Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Aleksandra Inic-Kanada
- Institute of Specific Prophylaxis and Tropical Medicine, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria.
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Kuratli J, Leonard CA, Nufer L, Marti H, Schoborg R, Borel N. Maraviroc, celastrol and azelastine alter Chlamydia trachomatis development in HeLa cells. J Med Microbiol 2020; 69:1351-1366. [PMID: 33180014 DOI: 10.1099/jmm.0.001267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Introduction . Chlamydia trachomatis (Ct) is an obligate intracellular bacterium, causing a range of diseases in humans. Interactions between chlamydiae and antibiotics have been extensively studied in the past.Hypothesis/Gap statement: Chlamydial interactions with non-antibiotic drugs have received less attention and warrant further investigations. We hypothesized that selected cytokine inhibitors would alter Ct growth characteristics in HeLa cells.Aim. To investigate potential interactions between selected cytokine inhibitors and Ct development in vitro.Methodology. The CCR5 receptor antagonist maraviroc (Mara; clinically used as HIV treatment), the triterpenoid celastrol (Cel; used in traditional Chinese medicine) and the histamine H1 receptor antagonist azelastine (Az; clinically used to treat allergic rhinitis and conjunctivitis) were used in a genital in vitro model of Ct serovar E infecting human adenocarcinoma cells (HeLa).Results. Initial analyses revealed no cytotoxicity of Mara up to 20 µM, Cel up to 1 µM and Az up to 20 µM. Mara exposure (1, 5, 10 and 20 µM) elicited a reduction of chlamydial inclusion numbers, while 10 µM reduced chlamydial infectivity. Cel 1 µM, as well as 10 and 20 µM Az, reduced chlamydial inclusion size, number and infectivity. Morphological immunofluorescence and ultrastructural analysis indicated that exposure to 20 µM Az disrupted chlamydial inclusion structure. Immunofluorescence evaluation of Cel-incubated inclusions showed reduced inclusion sizes whilst Mara incubation had no effect on inclusion morphology. Recovery assays demonstrated incomplete recovery of chlamydial infectivity and formation of structures resembling typical chlamydial inclusions upon Az removal.Conclusion. These observations indicate that distinct mechanisms might be involved in potential interactions of the drugs evaluated herein and highlight the need for continued investigation of the interaction of commonly used drugs with Chlamydia and its host.
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Affiliation(s)
- Jasmin Kuratli
- Institute of Veterinary Pathology (IVPZ) and Center for Applied Biotechnology and Molecular Medicine (CABMM), University of Zurich, Zurich, Switzerland
| | - Cory Ann Leonard
- Institute of Veterinary Pathology (IVPZ) and Center for Applied Biotechnology and Molecular Medicine (CABMM), University of Zurich, Zurich, Switzerland
| | - Lisbeth Nufer
- Institute of Veterinary Pathology (IVPZ) and Center for Applied Biotechnology and Molecular Medicine (CABMM), University of Zurich, Zurich, Switzerland
| | - Hanna Marti
- Institute of Veterinary Pathology (IVPZ) and Center for Applied Biotechnology and Molecular Medicine (CABMM), University of Zurich, Zurich, Switzerland
| | - Robert Schoborg
- Departement of Biomedical Sciences, Center for Infectious Disease, Inflammation and Immunity, Quillen College in Medicine, East Tennessee State University, Johnson City, TN, USA
| | - Nicole Borel
- Institute of Veterinary Pathology (IVPZ) and Center for Applied Biotechnology and Molecular Medicine (CABMM), University of Zurich, Zurich, Switzerland
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Borel N, Sauer-Durand AM, Hartel M, Kuratli J, Vaupel P, Scherr N, Pluschke G. wIRA: hyperthermia as a treatment option for intracellular bacteria, with special focus on Chlamydiae and Mycobacteria. Int J Hyperthermia 2020; 37:373-383. [PMID: 32319834 DOI: 10.1080/02656736.2020.1751312] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The emergence of antibiotic-resistant bacteria in the last century is alarming and calls for alternative, nonchemical treatment strategies. Thermal medicine uses heat for the treatment of infectious diseases but its use in facultative and obligate intracellular bacteria remains poorly studied. In this review, we summarize previous research on reducing the infectious burden of Mycobacterium ulcerans and Chlamydia trachomatis by using water-filtered infrared A-radiation (wIRA), a special form of heat radiation with high tissue penetration and low thermal load on the skin surface. Mycobacterium ulcerans is a thermosensitive bacterium causing chronic necrotizing skin disease. Therefore, previous data on wIRA-induced improvement of wound healing and reduction of wound infections is summarized first. Then, pathogenesis and treatment of infections with M. ulcerans causing Buruli ulcer and of those with C. trachomatis infecting the ocular conjunctiva and resulting in blinding trachoma are discussed. Both bacteria cause neglected tropical diseases and have similar geographical distributions. Results of previous in vitro and in vivo studies using wIRA on M. ulcerans and C. trachomatis infections are presented. Finally, technical aspects of using wIRA in patients are critically reviewed and open questions driving future research are highlighted. In conclusion, wIRA is a promising tool for reducing infectious burden due to intracellular bacteria such as M. ulcerans and C. trachomatis.
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Affiliation(s)
- Nicole Borel
- Infection Pathology Unit, Department of Pathobiology, Vetsuisse Faculty and Center for Applied Biotechnology and Molecular Medicine (CABMM), Institute of Veterinary Pathology, University of Zurich, Zurich, Switzerland
| | | | - Mark Hartel
- Clinic for Visceral Surgery, Cantonal Hospital Aarau, Aarau, Switzerland
| | - Jasmin Kuratli
- Infection Pathology Unit, Department of Pathobiology, Vetsuisse Faculty and Center for Applied Biotechnology and Molecular Medicine (CABMM), Institute of Veterinary Pathology, University of Zurich, Zurich, Switzerland
| | - Peter Vaupel
- Department of Radiation Oncology, Medical Center, University of Freiburg, Freiburg i.B, Germany
| | - Nicole Scherr
- Molecular Immunology Unit, Department of Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, Basel, Switzerland
| | - Gerd Pluschke
- Molecular Immunology Unit, Department of Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, Basel, Switzerland
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Inic-Kanada A, Stojanovic M, Miljkovic R, Stein E, Filipovic A, Frohns A, Zöller N, Kuratli J, Barisani-Asenbauer T, Borel N. Water-filtered Infrared A and visible light (wIRA/VIS) treatment reduces Chlamydia caviae-induced ocular inflammation and infectious load in a Guinea pig model of inclusion conjunctivitis. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2020; 209:111953. [PMID: 32653859 DOI: 10.1016/j.jphotobiol.2020.111953] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 06/12/2020] [Accepted: 07/01/2020] [Indexed: 11/29/2022]
Abstract
Trachoma is a devastating neglected tropical disease caused by Chlamydia trachomatis and the leading global cause of infectious blindness. Although antibiotic treatment against trachoma is efficient (SAFE strategy), additional affordable therapeutic strategies are of high interest. Water-filtered infrared A and visible light (wIRA/VIS) irradiation has proven to reduce chlamydial infectivity in vitro and ex vivo. The aim of this study was to evaluate whether wIRA/VIS can reduce chlamydial infection load and/or ocular pathology in vivo, in a guinea pig model of inclusion conjunctivitis. Guinea pigs were infected with 1 × 106 inclusion-forming units/eye of Chlamydia caviae via the ocular conjunctiva on day 0. In infected animals, wIRA/VIS irradiation (2100 W/m2) was applied on day 2 (single treatment) and on days 2 and 4 (double treatment) post-infection (pi). wIRA/VIS reduced the clinical pathology score on days 7 and 14 pi and the conjunctival chlamydial load on days 2, 4, 7, and 14 pi in comparison with C. caviae-infected, not irradiated, controls. Furthermore, numbers of chlamydial inclusions were decreased in wIRA/VIS treated C. caviae-infected guinea pigs on day 21 pi compared to C. caviae-infected, non-irradiated, controls. Double treatment with wIRA/VIS (days 2 and 4 pi) was more efficient than a single treatment on day 2 pi. wIRA/VIS treatment did neither induce macroscopic nor histologic changes in ocular tissues. Our results indicate that wIRA/VIS shows promising efficacy to reduce chlamydial infectivity in vivo without causing irradiation related pathologies in the follow-up period. wIRA/VIS irradiation is a promising approach to reduce trachoma transmission and pathology of ocular chlamydial infection.
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Affiliation(s)
- Aleksandra Inic-Kanada
- Institute of Specific Prophylaxis and Tropical Medicine, Medical University of Vienna, Vienna, Austria.
| | | | | | | | - Ana Filipovic
- Institute of Virology, Vaccines and Sera - TORLAK, Belgrade, Serbia
| | | | - Nadja Zöller
- Universitätsklinikum Frankfurt, Klinik für Dermatologie, Venerologie und Allergologie, Frankfurt, Germany
| | - Jasmin Kuratli
- Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Talin Barisani-Asenbauer
- Institute of Specific Prophylaxis and Tropical Medicine, Medical University of Vienna, Vienna, Austria
| | - Nicole Borel
- Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
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Piazena H, Müller W, Pendl W, von Ah S, Cap VH, Hug PJ, Sidler X, Pluschke G, Vaupel P. Thermal field formation during wIRA-hyperthermia: temperature measurements in skin and subcutis of piglets as a basis for thermotherapy of superficial tumors and local skin infections caused by thermosensitive microbial pathogens. Int J Hyperthermia 2020; 36:938-952. [PMID: 31535588 DOI: 10.1080/02656736.2019.1655594] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
Purpose: The temporal and spatial formation of the temperature field and its changes during/upon water-filtered infrared-A (wIRA)-irradiation in porcine skin and subcutis were investigated in vivo in order to get a detailed physical basis for thermotherapy of superficial tumors and infections caused by thermosensitive microbial pathogens (e.g., Mycobacterium ulcerans causing Buruli ulcer). Methods: Local wIRA-hyperthermia was performed in 11 anesthetized piglets using 85.0 mW cm-2, 103.2 mW cm-2 and 126.5 mW cm-2, respectively. Invasive temperature measurements were carried out simultaneously in 1-min intervals using eight fiber-optical probes at different tissue depths between 2 and 20 mm, and by an IR thermometer at the skin surface. Results: Tissue temperature distribution depended on incident irradiance, exposure time, tissue depths and individual 'physiologies' of the animals. Temperature maxima were found at depths between 4 and 7 mm, exceeding skin surface temperatures by about 1-2 K. Tissue temperatures above 37 °C, necessary to eradicate M. ulcerans at depths <20 mm, were reached reliably. Conclusions: wIRA-hyperthermia may be considered as a novel therapeutic option for treatment of local skin infections caused by thermosensitive pathogens (e.g., in Buruli ulcer). To ensure temperatures required for heat treatment of superficial tumors deeper than 4 mm, the incident irradiance needed can be controlled either by (a) invasive temperature measurements or (b) control of skin surface temperature and considering possible temperature increases up to 1-2 K in underlying tissue.
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Affiliation(s)
- Helmut Piazena
- Medical Photobiology Group, Department of Internal Medicine, Charité-University Medicine Berlin , Berlin , Germany
| | - Werner Müller
- Physical Optics Consultant Office , Wetzlar , Germany
| | - Wolfgang Pendl
- Department of Farm Animals, Division of Swine Medicine, Vetsuisse Faculty, University of Zürich , Zürich , Switzerland
| | - Sereina von Ah
- Department of Farm Animals, Division of Swine Medicine, Vetsuisse Faculty, University of Zürich , Zürich , Switzerland
| | - Veronika H Cap
- Section of Anaesthesiology, Equine Department, Vetsuisse Faculty, University of Zürich , Zürich , Switzerland
| | - Petra J Hug
- Section of Anaesthesiology, Equine Department, Vetsuisse Faculty, University of Zürich , Zürich , Switzerland
| | - Xaver Sidler
- Department of Farm Animals, Division of Swine Medicine, Vetsuisse Faculty, University of Zürich , Zürich , Switzerland
| | - Gerd Pluschke
- Department of Medical Parasitology and Infection Biology, Molecular Immunology Unit, Swiss Tropical and Public Health Institute , Basel , Switzerland
| | - Peter Vaupel
- Department of Radiation Oncology, University Medical Center , Freiburg i. Breisgau , Germany
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Kuratli J, Borel N. Perspective: Water-Filtered Infrared-A-Radiation (wIRA) - Novel Treatment Options for Chlamydial Infections? Front Microbiol 2019; 10:1053. [PMID: 31134043 PMCID: PMC6522854 DOI: 10.3389/fmicb.2019.01053] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 04/26/2019] [Indexed: 11/13/2022] Open
Abstract
Water-filtered infrared-A-radiation (wIRA) is a promising therapeutic method, which is particularly used as supportive treatment for wound closure, and wound infection treatment and prevention. High penetration properties of the heat field and beneficial effects on wound healing processes predispose wIRA irradiation to be a non-invasive treatment method for bacterial infections in superficial tissues. Since Chlamydia trachomatis still represents the leading cause of infectious blindness in third world countries (WHO http://www.who.int/topics/trachoma/en/) and wIRA displays beneficial effects on chlamydial infections in vitro without inducing cellular damage in ex vivo eye models and also shows beneficial effects on wound healing, this irradiation technique might represent a promising future treatment for trachoma patients. To this end, further studies investigating shorter irradiation times or irradiation of Chlamydia in chronic infections [the chlamydial stress response (Bavoil, 2014)] as well as safety studies in animal models should clearly be performed.
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Affiliation(s)
- Jasmin Kuratli
- Institute of Veterinary Pathology, University of Zurich, Zurich, Switzerland
| | - Nicole Borel
- Institute of Veterinary Pathology, University of Zurich, Zurich, Switzerland
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