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Qi W, Min SN, Mao XD, Su JZ, Yu GY, Wu LL, Cong X, Wang YG. The Mechanism of 540 nm Green Light in Promoting Salivary Secretion. Photobiomodul Photomed Laser Surg 2024; 42:514-523. [PMID: 39150379 DOI: 10.1089/photob.2024.0054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/17/2024] Open
Abstract
Background: Although low-level laser therapy (LLLT) is a widely used noninvasive treatment because of photobiomodulation effects, its application for xerostomia remained uncertain. Tight junctions (TJs), mainly composed of claudins, occludin, and ZO family members, are crucial structures that determine material transport through paracellular pathway in salivary gland epithelial cells. This work aimed to investigate whether LLLT affected salivary secretion through epithelial TJs. Methods: Transepithelial electrical resistance (TER) measurement and paracellular permeability assay were applied to evaluate paracellular permeability in submandibular gland (SMG)-C6 cells after irradiation with 540 nm green light. Immunofluorescence and western blot were used to detect the expression of TJ proteins. Quantitative phosphoproteomics were performed to explore possible intracellular signals. Results: We found that irradiation with 540 nm green light significantly decreased TER values while increased paracellular transport in SMG-C6 cells. 540 nm green light-induced redistribution of claudin-1, -3, and -4, but not occludin or ZO-1. Moreover, above phenomena were abolished by preincubation with capsazepine, an antagonist of transient receptor potential vanilloid subtype 1. Notably, irradiation with 540 nm green light on the skin covering the whole submandibular gland regions promoted salivary secretion and attenuated lymphocytic infiltration in 21-week-old non-obese diabetic mice (n = 5 per group), a xerostomia animal model for Sjögren's syndrome. Through in-depth bioinformatics analysis and expression verification, ERK1/2 and EphA2 served as potential canonical and noncanonical signals underlying 540 nm green light. Conclusions: Our findings uncovered the novel therapeutic effects of 540 nm green light on xerostomia through regulation on the expression and distribution of TJs.
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Affiliation(s)
- Wei Qi
- Department of General Dentistry, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & NHC Key Laboratory of Digital Stomatology & NMPA Key Laboratory for Dental Materials, Beijing, P. R. China
| | - Sai-Nan Min
- First Clinical Division, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices& Beijing Key Laboratory of Digital Stomatology & NHC Key Laboratory of Digital Stomatology & NMPA Key Laboratory for Dental Materials, Beijing, P. R. China
| | - Xiang-Di Mao
- Department of Physiology and Pathophysiology, Peking University School of Basic Medical Sciences, State Key Laboratory of Vascular Homeostasis and Remodeling, Beijing, P. R. China
| | - Jia-Zeng Su
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices& Beijing Key Laboratory of Digital Stomatology & NHC Key Laboratory of Digital Stomatology & NMPA Key Laboratory for Dental Materials, Beijing, P. R. China
| | - Guang-Yan Yu
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices& Beijing Key Laboratory of Digital Stomatology & NHC Key Laboratory of Digital Stomatology & NMPA Key Laboratory for Dental Materials, Beijing, P. R. China
| | - Li-Ling Wu
- Department of Physiology and Pathophysiology, Peking University School of Basic Medical Sciences, State Key Laboratory of Vascular Homeostasis and Remodeling, Beijing, P. R. China
| | - Xin Cong
- Department of Physiology and Pathophysiology, Peking University School of Basic Medical Sciences, State Key Laboratory of Vascular Homeostasis and Remodeling, Beijing, P. R. China
| | - Yu-Guang Wang
- Department of General Dentistry II, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices& Beijing Key Laboratory of Digital Stomatology & NHC Key Laboratory of Digital Stomatology & NMPA Key Laboratory for Dental Materials, Beijing, P. R. China
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Micro-CT analysis of the mandibular bone microarchitecture of rats after radiotherapy and low-power laser therapy. Lasers Med Sci 2022; 37:2645-2653. [PMID: 35257243 DOI: 10.1007/s10103-022-03532-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 02/21/2022] [Indexed: 10/18/2022]
Abstract
To investigate whether low-level laser therapy (LLLT), at different times of application (immediate and late) in the region of the parotid glands, has a distance effect on the microarchitecture of the trabecular bone in mandible of rats irradiated by volumetric modular arc therapy (VMAT). Thirty adult Wistar rats were randomly divided into placebo control groups (CG, n = 2), only radiotherapy (RG, n = 2), only LPLT (LG, n = 2), and two other groups using LLLT in the immediate time (24 h) (ILG, n = 12) and late (120 h) (LLG, n = 12) to radiotherapy by VMAT in a single dose of 12 Gy. LLLT with AsGaAl laser (660 nm, 100 mW), a spot size of 0.0028 cm2, was applied in three points in the region of the right parotid gland, with energy of 2 J/cm2, 20 s per point, for 10 consecutive days. After euthanasia, the right hemimandibles of each animal were dissected, prepared, and analyzed by computerized microtomography (micro-CT) and histomorphometry. The different groups were analyzed by the Tukey and Bonferroni multiple comparison tests. The micro-CT analysis found statistically significant differences between the groups, especially in the LLG, which had the highest average bone volume compared to the CG (p = 0.001) and ILG (p = 0.002) and a greater number of trabeculae than the CG (p = 0.000) and ILG (p = 0.031). The ILG also had a higher number of trabeculae than the CG (p = 0.005). Trabecula separation (Tb.Sp) was lower in the LLG (p = 0.000) and ILG (p = 0.002) when compared to the CG. In the histomorphometry, there was no statistical difference between the groups in relation to all the analyzed variables. Micro-CT analysis showed that the LLLT, even applied at a distance, both in the immediate and late VMAT times, has an effect on the mandibular bone microarchitecture by increasing the volume and number of trabeculae and decreasing the spaces between them.
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de Oliveira MC, Krueger GF, Sganzerla JT, Gassen HT, Hernández PAG, Allgayer MDC, Miguens-Jr SAQ. Effect of Radiotherapy and Low-Level Laser Therapy on Circulating Blood Cells of Rats. J Lasers Med Sci 2021; 12:e45. [PMID: 34733768 DOI: 10.34172/jlms.2021.45] [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] [Received: 10/18/2020] [Accepted: 02/22/2021] [Indexed: 11/09/2022]
Abstract
Introduction: This study aimed to investigate the effect of low-level laser therapy (LLLT) on the blood cell count when applied to parotid glands of rats irradiated by volumetric modular arc therapy (VMAT). Methods: Thirty-two adult male Wistar rats were used in this study. Samples were randomly assigned to three groups: control group (CG, n = 8), immediate laser group (24 hours) (ILG, n=12), and late laser group (120 hours) (LLG, n=12). The two laser groups were previously subjected to VMAT radiotherapy in a single dose of 12 Gy. LLLT with an AsGaAl laser (660 nm, 100 mW) was applied at three points in the region of the parotid glands, right side, with the energy of 2 J per point (20s, 70 J/cm2) and a spot size of 0.0028 cm2 for 10 consecutive days. In the euthanasia, blood samples were obtained by cardiac puncture. The samples from each group were processed by an automatic method and analyzed for erythrogram, leukogram and platelet count values. The data were analyzed by ANOVA and each LLLT time point was analyzed in relation to the control group, with a significance level less than 0.05. Results: Groups using LLLT had higher red blood cell counts, being higher in the LLG (P = 0.000). The hematimetric indices MCV (P = 0.002) and MCH (P = 0.009) were lower than the control group, especially when compared to the group using LLLT 120h after radiotherapy (LLG). White blood cell counts were lower in the groups with radiotherapy and immediate use of LLLT (ILG) (P = 0.011), mainly at the expense of lymphocytes (P = 0.002). Conclusion: The results suggest a potential systemic effect of LLLT, especially on circulating red blood cell counts, regardless of their time of immediate or late use of radiotherapy.
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Affiliation(s)
| | - Gabriel Francisco Krueger
- Department of Oral Medicine, Graduate Program in Dentistry, Universidade Luterana do Brasil, Canoas, RS, Brazil
| | - Juliana Tomaz Sganzerla
- Department of Oral Medicine, Graduate Program in Dentistry, Universidade Luterana do Brasil, Canoas, RS, Brazil
| | - Humberto Thomazi Gassen
- Department of Oral Medicine, Graduate Program in Dentistry, Universidade Luterana do Brasil, Canoas, RS, Brazil
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Golež A, Frangež I, Cankar K, Frangež HB, Ovsenik M, Nemeth L. Effects of low-level light therapy on xerostomia related to hyposalivation: a systematic review and meta-analysis of clinical trials. Lasers Med Sci 2021; 37:745-758. [PMID: 34409539 DOI: 10.1007/s10103-021-03392-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 07/26/2021] [Indexed: 02/06/2023]
Abstract
Hyposalivation is a condition represented by a reduced salivary flow and may include symptoms such as mouth dryness (xerostomia), loss of taste, pain, dysphagia, and dysphonia, all of which greatly affect an individual's quality of life.The aim of the present study was to systematically review the effects of low-level light therapy irradiation (photobiomodulation) on salivary gland function in patients with hyposalivation.The main question of the systematic review was: "Does low-level light irradiation therapy of the salivary glands affect salivary flow rate or indicators of salivary function (ion and protein concentrations) in patients with xerostomia or hyposalivation?" The question was based on the PICO (participant, intervention, control, outcome) principle and followed the PRISMA guidelines. Databases were explored and papers published between the years 1997 and 2020 were reviewed for the following Mesh-term keywords and their corresponding entry terms in different combinations: "Low-level light therapy," "Xerostomia," "Saliva," "Salivary glands," "Salivation."The initial sample consisted of 220 articles. Of those, 47 articles were used for full-text analysis and 18 were used for a systematic review, 14 were used in meta-analysis. According to their individual quality, most articles were classified as high quality of evidence according to the GRADE score. Meta-analysis of the evidence observed increase of unstimulated salivary flow 0.51 SMD compared to placebo (95% CI: 0.16-0.86), I2 = 50%, p = 0.005.The findings of our review revealed evidence of a beneficial effect of photobiomodulation therapy on salivary gland function. The therapy alleviates xerostomia and hyposalivation. However, these effects are reported short term only and did not induce lasting effects of photobiomodulation therapy on patients' quality of life.
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Affiliation(s)
- Aljaž Golež
- Institute of Physiology, Faculty of Medicine, University of Ljubljana, Zaloska cesta 4, Ljubljana, Slovenia
| | - Igor Frangež
- Department for Surgical Infections, University Medical Center Ljubljana, Zaloska cesta 2, 1000, Ljubljana, Slovenia.,Department of Surgery, Faculty of Medicine, University of Ljubljana, Zaloska cesta 7, Ljubljana, Slovenia
| | - Ksenija Cankar
- Institute of Physiology, Faculty of Medicine, University of Ljubljana, Zaloska cesta 4, Ljubljana, Slovenia
| | - Helena Ban Frangež
- Department of Gynaecology and Obstetrics, Faculty of Medicine, University of Ljubljana, Slajmerjeva 3, 1000, Ljubljana, Slovenia.,Department of Obstetrics and Gynaecology, University Medical Center Ljubljana, Slajmerjeva 3, 1000, Ljubljana, Slovenia
| | - Maja Ovsenik
- Department of Orthodontics and Dentofacial Orthopaedics, Faculty of Medicine, University of Ljubljana, Hrvatski trg 6, Ljubljana, Slovenia
| | - Lidija Nemeth
- Department of Dental Diseases and Normal Dental Morphology, Faculty of Medicine, University of Ljubljana, Hrvatski trg 6, Ljubljana, Slovenia.,Division of Stomatology, University Medical Centre Ljubljana, Stomatoloska klinika, Hrvatski trg 6, 1000, Ljubljana, Slovenia
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5
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Krueger GF, de Oliveira MC, Gassen HT, Sganzerla JT, Simon D, Grivicich I, Hernández PAG, Miguens-Jr SAQ. Evaluation of Aquaporins 1 and 5 Expression in Rat Parotid Glands After Volumetric Modulated Arc Radiotherapy and Use of Low-Level Laser Therapy at Different Times. J Lasers Med Sci 2020; 11:262-267. [PMID: 32802285 DOI: 10.34172/jlms.2020.44] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Introduction: This experimental study investigated the mRNA expression of aquaporins (AQPs) 1 and 5 in the parotid glands of rats irradiated with volumetric modulated arc therapy (VMAT) and subjected to low-level laser therapy (LLLT) at different time points. Methods: The sample consisted of 30 Wistar rats (Rattus norvegicus) divided into the following groups: control, LLLT alone (LG), radiotherapy alone (RG), and experimental groups that received LLLT at 24 hours (early experimental group [EEG], n=12) and 120 hours (late experimental group [LEG], n=12) after radiotherapy. VMAT was delivered at a single dose (12 Gy) and LLLT was performed with an aluminium-gallium-arsenide diode laser (660 nm, 100 mW), spot area of 0.0028 cm2, energy of 2 J/cm2 applied to 3 spots in the region corresponding to the right parotid gland, for 10 consecutive days. The right parotid gland was resected and prepared for RNA extraction. The gene expression of AQPs was evaluated by quantitative polymerase chain reaction (qPCR) using specific TaqMan probes, with the HPRT gene as an internal control. Results: The lowest AQP1 gene expression was 0.83 (0.27) with the use of LLLT 24 hours after radiotherapy (EEG), and the highest was 1.56 (0.80) with the use of LLLT alone (LG). Likewise, the lowest AQP5 gene expression was found in the EEG (mean = 0.88; SD = 0.49) and the highest in the LG (mean = 1.29; SD = 0.33). Conclusion: The use of LLLT after radiotherapy may contribute to the maintenance and an increase of these proteins, even when used at a later time point after radiotherapy.
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Affiliation(s)
- Gabriel Francisco Krueger
- Department of Oral Medicine, Graduate Program in Dentistry, Universidade Luterana do Brasil, Canoas, RS, Brazil
| | | | - Humberto Thomazi Gassen
- Department of Oral Medicine, Graduate Program in Dentistry, Universidade Luterana do Brasil, Canoas, RS, Brazil
| | - Juliana Tomaz Sganzerla
- Department of Oral Medicine, Graduate Program in Dentistry, Universidade Luterana do Brasil, Canoas, RS, Brazil
| | - Daniel Simon
- Graduate Program in Cellular and Molecular Biology Applied to Health, Universidade Luterana do Brasil, Canoas, RS, Brazil
| | - Ivana Grivicich
- Graduate Program in Cellular and Molecular Biology Applied to Health, Universidade Luterana do Brasil, Canoas, RS, Brazil
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Tam SY, Tam VCW, Ramkumar S, Khaw ML, Law HKW, Lee SWY. Review on the Cellular Mechanisms of Low-Level Laser Therapy Use in Oncology. Front Oncol 2020; 10:1255. [PMID: 32793501 PMCID: PMC7393265 DOI: 10.3389/fonc.2020.01255] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 06/17/2020] [Indexed: 12/15/2022] Open
Abstract
Photobiomodulation (PBM) using low-level laser therapy (LLLT) is a treatment that is increasingly used in oncology. Studies reported enhancement of wound healing with reduction in pain, tissue swelling and inflammatory conditions such as radiation dermatitis, oral mucositis, and lymphedema. However, factors such as wavelength, energy density and irradiation frequency influence the cellular mechanisms of LLLT. Moreover, the effects of LLLT vary according to cell types. Thus, controversy arose as a result of poor clinical response reported in some studies that may have used inadequately planned treatment protocols. Since LLLT may enhance tumor cell proliferation, these will also need to be considered before clinical use. This review aims to summarize the current knowledge of the cellular mechanisms of LLLT by considering its effects on cell proliferation, metabolism, angiogenesis, apoptosis and inflammation. With a better understanding of the cellular mechanisms, bridging findings from laboratory studies to clinical application can be improved.
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Affiliation(s)
- Shing Yau Tam
- Department of Health Technology and Informatics, Faculty of Health and Social Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - Victor C W Tam
- Department of Health Technology and Informatics, Faculty of Health and Social Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - Shanmugasundaram Ramkumar
- Department of Clinical Oncology, NHS Foundation Trust, University Hospital Southampton, Southampton, United Kingdom
| | - May Ling Khaw
- Tasmanian School of Medicine, University of Tasmania, Hobart, TAS, Australia
| | - Helen K W Law
- Department of Health Technology and Informatics, Faculty of Health and Social Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - Shara W Y Lee
- Department of Health Technology and Informatics, Faculty of Health and Social Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong
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Kalhori KA, Vahdatinia F, Jamalpour MR, Vescovi P, Fornaini C, Merigo E, Fekrazad R. Photobiomodulation in Oral Medicine. PHOTOBIOMODULATION PHOTOMEDICINE AND LASER SURGERY 2019; 37:837-861. [DOI: 10.1089/photob.2019.4706] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
| | - Farshid Vahdatinia
- Dental Implants Research Center, Dental School of Hamadan University of Medical Sciences, Hamadan, Iran
| | - Mohammad Reza Jamalpour
- Department of Oral and Maxillofacial Surgery, Dental Implants Research Center, Faculty of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Paolo Vescovi
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Carlo Fornaini
- Group of Applied ElectroMagnetics, Department of Engineering and Architecture, University of Parma, Parma, Italy
- Laboratoire MicOralIS (Microbiologie Orale, Immunothérapie et Santé) EA7354, UFR d'Odontologie, Université Nice Sophia Antipolis, Nice, France
| | - Elisabetta Merigo
- Laboratoire MicOralIS (Microbiologie Orale, Immunothérapie et Santé) EA7354, UFR d'Odontologie, Université Nice Sophia Antipolis, Nice, France
| | - Reza Fekrazad
- Radiation Sciences Research Center, Laser Research Center in Medical Sciences, AJA University of Medical Sciences, Tehran, Iran
- International Network for Photo Medicine and Photo Dynamic Therapy (INPMPDT), Universal Scientific Education and Research Network (USERN), Tehran, Iran
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8
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Sousa AS, Silva JF, Pavesi VCS, Carvalho NA, Ribeiro-Júnior O, Varellis MLZ, Prates RA, Bussadori SK, Gonçalves MLL, Horliana ACRT, Deana AM. Photobiomodulation and salivary glands: a systematic review. Lasers Med Sci 2019; 35:777-788. [DOI: 10.1007/s10103-019-02914-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Accepted: 10/30/2019] [Indexed: 12/14/2022]
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9
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da Fonseca ADS. Is there a measure for low power laser dose? Lasers Med Sci 2018; 34:223-234. [PMID: 30402798 DOI: 10.1007/s10103-018-2676-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Accepted: 10/30/2018] [Indexed: 12/22/2022]
Abstract
Low power lasers have been used successfully for treatment of many diseases in soft and bone tissues. Basic and clinical researches have developed quickly being the scientific basis to therapeutic protocols based on these lasers. However, there are difficulties to compare experimental and clinical results obtained from different researchers because a complicated and intricate list of physical and biological parameters should be checked before the irradiation procedures as well as part of these parameters are omitted or inaccurately reported. This review focuses on the physical and biological parameters proposed to make experimental and clinical protocols accurate and reproducible as well as suggests dose parameters based on biological effects induced by low power lasers. A variety of parameters are reported by different authors and the number of parameter suggested could overcome three dozens. Thus, laser dose and laser dose equivalent are defined based on laser-induced biological effects and suggested as simplified dose parameters for low power lasers. These parameters could simplify and be useful to researchers and clinicians, permitting comparisons and decreasing mistakes and inaccuracies when laser-induced effects are evaluated and compared with those obtained in previous studies. The laser dose and laser dose equivalent could contribute significantly to improve accuracy, effectiveness, and safety of clinical protocols based on low power lasers.
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Affiliation(s)
- Adenilson de Souza da Fonseca
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Boulevard Vinte e Oito de Setembro, Avenida 28 de Setembro, 87, fundos, Vila Isabel, Rio de Janeiro, 20551030, Brazil. .,Centro de Ciências da Saúde, Centro Universitário Serra dos Órgãos, Avenida Alberto Torres, 111, Teresópolis, Rio de Janeiro, 25964004, Brazil.
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10
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Biswas R, Ahn JC, Moon JH, Kim J, Choi YH, Park SY, Chung PS. Low-level laser therapy with 850 nm recovers salivary function via membrane redistribution of aquaporin 5 by reducing intracellular Ca 2+ overload and ER stress during hyperglycemia. Biochim Biophys Acta Gen Subj 2018; 1862:1770-1780. [PMID: 29751100 DOI: 10.1016/j.bbagen.2018.05.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 05/04/2018] [Accepted: 05/07/2018] [Indexed: 12/28/2022]
Abstract
The overall goal is to study the effect of low-level laser therapy (LLLT) on membrane distribution of major water channel protein aquaporin 5 (AQP5) in salivary gland during hyperglycemia. Par C10 cells treated with high glucose (50 mM) showed a reduced membrane distribution of AQP5. The functional expression of AQP5 was downregulated due to intracellular Ca2+ overload and ER stress. This reduction in AQP5 expression impairs water permeability and therefore results in hypo-salivation. A reduced salivary flow was also observed in streptozotocin (STZ)-induced diabetic mice model and the expression of AQP5 and phospho-AQP5 was downregulated. Low-level laser treatment with 850 nm (30 mW, 10 min = 18 J/cm2) reduced ER stress and recovered AQP5 membrane distribution via serine phosphorylation in the cells. In the STZ-induced diabetic mouse, LLLT with 850 nm (60 J/cm2) increased salivary flow and upregulated of AQP5 and p-AQP5. ER stress was also reduced via downregulation of caspase 12 and CHOP. In silico analysis confirmed that the serine 156 is one of the most favorable phosphorylation sites of AQP5 and may contribute to the stability of the protein. Therefore, this study suggests high glucose inhibits phosphorylation-dependent AQP5 membrane distribution. High glucose induces intracellular Ca2+ overload and ER stress that disrupt AQP5 functional expression. Low-level laser therapy with 850 nm improves salivary function by increasing AQP5 membrane distribution in hyperglycemia-induced hyposalivation.
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Affiliation(s)
- Raktim Biswas
- Laser Translational Clinical Trial Centre, Dankook University Hospital, Cheonan, Republic of Korea
| | - Jin Chul Ahn
- Department of Biomedical Science, College of Medicine, Dankook University, Cheonan, Republic of Korea
| | - Jeong Hwan Moon
- Laser Translational Clinical Trial Centre, Dankook University Hospital, Cheonan, Republic of Korea; Department of Otolaryngology-Head and Neck Surgery, Dankook University College of Medicine, Cheonan, Republic of Korea
| | - Jungbin Kim
- Laser Translational Clinical Trial Centre, Dankook University Hospital, Cheonan, Republic of Korea
| | - Young-Hoon Choi
- Laser Translational Clinical Trial Centre, Dankook University Hospital, Cheonan, Republic of Korea
| | - So Young Park
- Laser Translational Clinical Trial Centre, Dankook University Hospital, Cheonan, Republic of Korea
| | - Phil-Sang Chung
- Laser Translational Clinical Trial Centre, Dankook University Hospital, Cheonan, Republic of Korea; Department of Otolaryngology-Head and Neck Surgery, Dankook University College of Medicine, Cheonan, Republic of Korea.
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11
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Ramos Silva C, Cabral FV, de Camargo CFM, Núñez SC, Mateus Yoshimura T, de Lima Luna AC, Maria DA, Ribeiro MS. Exploring the effects of low-level laser therapy on fibroblasts and tumor cells following gamma radiation exposure. JOURNAL OF BIOPHOTONICS 2016; 9:1157-1166. [PMID: 27322660 DOI: 10.1002/jbio.201600107] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 04/18/2016] [Indexed: 06/06/2023]
Abstract
Ionizing radiation (IR) induces DNA damage and low-level laser therapy (LLLT) has been investigated to prevent or repair detrimental outcomes resulting from IR exposure. Few in vitro studies, however, explore the biological mechanisms underlying those LLLT benefits. Thus, in this work, fibroblasts and tumor cells are submitted to IR with doses of 2.5 Gy and 10 Gy. After twenty-four-h, the cells are exposed to LLLT with fluences of 30 J cm-2 , 90 J cm-2 , and 150 J cm-2 . Cellular viability, cell cycle phases, cell proliferation index and senescence are evaluated on days 1 and 4 after LLLT irradiation. For fibroblasts, LLLT promotes - in a fluence-dependent manner - increments in cell viability and proliferation, while a reduction in the senescence was observed. Regarding tumor cells, no influences of LLLT on cell viability are noticed. Whereas LLLT enhances cell populations in S and G2 /M cell cycle phases for both cellular lines, a decrease in proliferation and increase in senescence was verified only for tumor cells. Putting together, the results suggest that fibroblasts and tumor cells present different responses to LLLT following exposure to gamma-radiation, and these promising results should stimulate further investigations. Senescence of tumor cells and fibroblasts on the 4th day after ionizing radiation (IR) and low-level laser therapy (LLLT) exposures. The number of senescent cells increased significantly for tumor cells (a) while for fibroblasts no increment was observed (b). The blue collor indicates senescence activity.
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Affiliation(s)
- Camila Ramos Silva
- Nuclear Technology Postgraduate Program, University of Sao Paulo, Av. Prof. Lineu Prestes, 2242, 05508-000, São Paulo, Brazil
- Laboratory of Optical Therapy (Center for Lasers and Applications/Nuclear and Energy Research Institute), Av. Prof. Lineu Prestes, 2242, 05508-000, Brazil
| | - Fernanda Viana Cabral
- Nuclear Technology Postgraduate Program, University of Sao Paulo, Av. Prof. Lineu Prestes, 2242, 05508-000, São Paulo, Brazil
- Laboratory of Optical Therapy (Center for Lasers and Applications/Nuclear and Energy Research Institute), Av. Prof. Lineu Prestes, 2242, 05508-000, Brazil
| | - Claudinei Francisco Morais de Camargo
- Nuclear Technology Postgraduate Program, University of Sao Paulo, Av. Prof. Lineu Prestes, 2242, 05508-000, São Paulo, Brazil
- Laboratory of Optical Therapy (Center for Lasers and Applications/Nuclear and Energy Research Institute), Av. Prof. Lineu Prestes, 2242, 05508-000, Brazil
| | - Silvia Cristina Núñez
- Laboratory of Optical Therapy (Center for Lasers and Applications/Nuclear and Energy Research Institute), Av. Prof. Lineu Prestes, 2242, 05508-000, Brazil
| | - Tania Mateus Yoshimura
- Nuclear Technology Postgraduate Program, University of Sao Paulo, Av. Prof. Lineu Prestes, 2242, 05508-000, São Paulo, Brazil
- Laboratory of Optical Therapy (Center for Lasers and Applications/Nuclear and Energy Research Institute), Av. Prof. Lineu Prestes, 2242, 05508-000, Brazil
| | - Arthur Cássio de Lima Luna
- Biochemistry and Biophysical Laboratory, Butantan Institute, Av. Vital Brazil, 1500, São Paulo, 05503-900, Brazil
- Medical School, University of Sao Paulo, Av. Dr. Arnaldo, 455, 01246-903, São Paulo, Brazil
| | - Durvanei Augusto Maria
- Biochemistry and Biophysical Laboratory, Butantan Institute, Av. Vital Brazil, 1500, São Paulo, 05503-900, Brazil
- Medical School, University of Sao Paulo, Av. Dr. Arnaldo, 455, 01246-903, São Paulo, Brazil
| | - Martha Simões Ribeiro
- Laboratory of Optical Therapy (Center for Lasers and Applications/Nuclear and Energy Research Institute), Av. Prof. Lineu Prestes, 2242, 05508-000, Brazil
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