151
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Photobiomodulation therapy: management of mucosal necrosis of the oropharynx in previously treated head and neck cancer patients. Support Care Cancer 2016; 25:1031-1034. [DOI: 10.1007/s00520-016-3525-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Accepted: 12/05/2016] [Indexed: 01/01/2023]
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152
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Yang D, Yi W, Wang E, Wang M. Effects of light-emitting diode irradiation on the osteogenesis of human umbilical cord mesenchymal stem cells in vitro. Sci Rep 2016; 6:37370. [PMID: 27874039 PMCID: PMC5118816 DOI: 10.1038/srep37370] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 10/28/2016] [Indexed: 01/18/2023] Open
Abstract
The aim of this study was to examine the effects of light-emitting diode (LED) photobiomodulation therapy on the proliferation and differentiation of human umbilical cord mesenchymal stem cells (hUMSCs) cultured in osteogenic differentiation medium. HUMSCs were irradiated with an LED light at 620 nm and 2 J/cm2 and monitored for cell proliferation and osteogenic differentiation activity. The experiment involved four groups of cells: the control group; the osteogenic group (osteo group); the LED group; the osteogenic + LED group (LED + osteo group). HUMSC proliferation was detected by performing a3-(4,5-dimethylthiazol-2yl)-2,5 diphenyltetrazolium bromide(MTT) assay. Osteogenic activity was evaluated by performing alkaline phosphatase (ALP) and Von Kossa staining, and osteopontin (OPN) gene mRNA expression was evaluated byreverse transcription polymerase chain reaction (RT-PCR). The hUMSCs in the LED + osteo group exhibited a significantly higher proliferation rate than the other subgroups. Additionally, there were greater numbers of ALP-positive cells and Von Kossa nodules in the LED + osteo group. OPN mRNA expression in the LED + osteo group was higher than other subgroups. In conclusion, low levels of LED light at a wavelength of 620 nm enhance the proliferation and osteogenic differentiation of hUMSCs during a long culture period.
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Affiliation(s)
- Dazhi Yang
- Department of Orthopaedics, Nanshan Hospital, Guangdong MedicalCollege, Shenzhen Guangdong, 518052, China
| | - Weihong Yi
- Department of Orthopaedics, Nanshan Hospital, Guangdong MedicalCollege, Shenzhen Guangdong, 518052, China
| | - Ertian Wang
- Department of Orthopaedics, Nanshan Hospital, Guangdong MedicalCollege, Shenzhen Guangdong, 518052, China
| | - Min Wang
- Department of Orthopaedics, Nanshan Hospital, Guangdong MedicalCollege, Shenzhen Guangdong, 518052, China
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153
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Goymen M, Isman E, Taner L, Kurkcu M. Histomorphometric evaluation of the effects of various diode lasers and force levels on orthodontic mini screw stability. Photomed Laser Surg 2016; 33:29-34. [PMID: 25594769 DOI: 10.1089/pho.2014.3833] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE The purpose of this study was to evaluate the effects of different laser dose and force levels on the stability of orthodontic mini screws used for anchorage, by histomorphometric analyses. BACKGROUND DATA Low-level laser therapy speeds up blood flow, improves the mechanism of the revitalization processes, reduces the risk of infection, boosts metabolic activities, and accelerates the healing of the damaged tissue. Although there are many research studies about low-level laser therapy applications in a variety of areas, no investigations were found concerning mini screw stability using various laser dose levels with different force level applications. METHODS Seventeen New Zealand white rabbits were used. A total of 68 cylindrical, self-drilling orthodontic mini screws were threaded at the fibula. Experimental subjects were divided into six groups; force application was not performed in the first three groups, whereas 150 g of force was applied via nickel-titanium closed-coil springs placed between two mini screws in the other three groups. Measurements of the initial torque values (10 Ncm) were manipulated by a digital portable torque gauge. Various low-level laser doses were applied to the groups during the postoperative 10 days. After 4 weeks, bone-to-implant contact and cortical bone thickness were histomorphometrically analyzed. RESULTS In the 150 g force plus 20 J/cm(2) dosage group, the highest bone-to-implant contact values were observed. (p<0.05) There were no statistically significant correlations between cortical bone thickness and bone-to-implant contact values; on the other hand, no significant difference was found among the same groups in terms of cortical bone thickness values (p>0.05). CONCLUSIONS Low-level laser therapy was noticed to induce the mini screw-bone contact area. Low-level laser therapy may be a supplementary treatment method to increase the stability of the orthodontic mini screw.
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Affiliation(s)
- Merve Goymen
- 1 Department of Orthodontics, Faculty of Dentistry, Gaziantep University , Gaziantep, Turkey
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154
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CO2 laser increases the regenerative capacity of human adipose-derived stem cells by a mechanism involving the redox state and enhanced secretion of pro-angiogenic molecules. Lasers Med Sci 2016; 32:117-127. [DOI: 10.1007/s10103-016-2093-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 09/29/2016] [Indexed: 01/08/2023]
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155
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Dabbous OA, Soliman MM, Mohamed NH, Elseify MY, Elsheikh MS, Alsharkawy AAA, Abd Al Aziz MM. Evaluation of the improvement effect of laser acupuncture biostimulation in asthmatic children by exhaled inflammatory biomarker level of nitric oxide. Lasers Med Sci 2016; 32:53-59. [PMID: 27709308 DOI: 10.1007/s10103-016-2082-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 09/19/2016] [Indexed: 11/29/2022]
Abstract
Variable therapy of asthma is not sufficient yet to achieve good asthma control. Therapy decision requires serial investigations. Low-level laser acupuncture is a suitable non-invasive modality of complementary medicine. The exhaled breath condensate (EBC) is easy and useful to evaluate the efficacy of drugs or novel therapy. This study aimed to evaluate the effectiveness of low-level laser biostimulation of acupuncture points on asthma improvement in children. Forty-eight asthmatic children were subdivided into case (laser) group, which received 12 direct contact low-power laser acupuncture sessions (three sessions/week) on specific traditional Chinese acupuncture points for bronchial asthma, and control asthmatic group, which received sham laser acupuncture on the same acupoints and number of sessions of the case (laser) group. Low-power Multichannel Aculas-AM laser (grade II) of wave length 780 nm, output power 800 mw, and beam spot size 0.1 cm2 with continuous mode was used. Eighteen acupoints were stimulated for 2 min, giving energy of 9.6 J/cm2/acupoint. The total session time was 3 min. Both groups were evaluated pre- and post-laser acupuncture intervention by recording levels of asthma control, pulmonary function, and EBC nitric oxide. In the case (laser) group, 91.7 % of patients experienced an improvement in the level of asthma control versus 25 % in the control group (p < 0.001). This was associated with a significant decrease of the breath condensate FENO concentration (p < 0.001) and significant increase of spirometry parameters (p < 0.001) in the case (laser) group. Application of laser acupuncture treatment given with conventional therapy can effectively improve bronchial asthma more than prescription of medications alone could.
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Affiliation(s)
- Ola A Dabbous
- Department of Medical Applications of Laser, National Institute of Laser Enhanced Sciences (NILES), Cairo University, Giza, Egypt.
| | - Mona M Soliman
- Department of Medical Applications of Laser, National Institute of Laser Enhanced Sciences (NILES), Cairo University, Giza, Egypt
| | - Nagwa H Mohamed
- Researches and Applications of Complementary Medicine Department, National Research Center, Cairo, Egypt
| | | | - Mai S Elsheikh
- Researches and Applications of Complementary Medicine Department, National Research Center, Cairo, Egypt
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Rizzi M, Migliario M, Rocchetti V, Tonello S, Renò F. Near-infrared laser increases MDPC-23 odontoblast-like cells proliferation by activating redox sensitive pathways. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 164:283-288. [PMID: 27718420 DOI: 10.1016/j.jphotobiol.2016.08.049] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 07/19/2016] [Accepted: 08/20/2016] [Indexed: 11/25/2022]
Abstract
Near infrared laser is known to induce biostimulatory effects, resulting in cell proliferation enhancement. Although such positive effect is widely exploited in various clinical applications, molecular mechanisms involved are still poorly understood. The aim of the study was to investigate the ability of laser stimulation to increase cell proliferation through an early activation of three redox sensitive pathways, namely Nrf-2, NF-κB and ERK in a rat odontoblast-like cell line (MDPC-23 cells). MDPC-23 cells were irradiated with different energy settings (0-50J, corresponding to 0-32.47J/cm2) and cell proliferation was evaluated by cell counting. Nrf-2, NF-κB and ERK signaling pathways activation was investigated through Western blot analysis. Our results show that a single 25J laser stimulation is able to increase cell proliferation and that this effect could be increased by repeating the stimulation twice with a time lapse of 24h. Western blot experiments demonstrated that laser stimulation is able to induce an early activation response in intracellular signaling, with an overlapping time pattern between the three considered pathways. Results discussed in this paper reveal a complex mechanism underlying near-infrared induced increase in pre-odontoblasts proliferation, involving three survival pathways that can act both separately or through reciprocal crosstalk. In particular, data presented suggest an important role for ERK pathway that could act directly by stimulating cell proliferation but can also induce both Nrf-2 and NF-κB activation, acting as a critical cellular checkpoint in response to imbalanced redox state generated by a laser induced increase in ROS production.
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Affiliation(s)
- Manuela Rizzi
- Innovative Research Laboratory for Wound Healing, Health Sciences Department, Università del Piemonte Orientale "A. Avogadro", via Solaroli, 17, 28100 Novara, Italy.
| | - Mario Migliario
- Dental Clinic, Health Sciences Department, Università del Piemonte Orientale "A. Avogadro", via Solaroli, 17, 28100 Novara, Italy.
| | - Vincenzo Rocchetti
- Dental Clinic, Health Sciences Department, Università del Piemonte Orientale "A. Avogadro", via Solaroli, 17, 28100 Novara, Italy.
| | - Stelvio Tonello
- Innovative Research Laboratory for Wound Healing, Health Sciences Department, Università del Piemonte Orientale "A. Avogadro", via Solaroli, 17, 28100 Novara, Italy.
| | - Filippo Renò
- Innovative Research Laboratory for Wound Healing, Health Sciences Department, Università del Piemonte Orientale "A. Avogadro", via Solaroli, 17, 28100 Novara, Italy.
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157
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Liu Y, Zhang H. Low-Level Laser Irradiation Precondition for Cardiac Regenerative Therapy. Photomed Laser Surg 2016; 34:572-579. [PMID: 27627137 DOI: 10.1089/pho.2015.4058] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
OBJECTIVE The purpose of this article was to review the molecular mechanisms of low-level laser irradiation (LLLI) preconditioning for heart cell therapy. BACKGROUND DATA Stem cell transplantation appears to offer a better alternative to cardiac regenerative therapy. Previous studies have confirmed that the application of LLLI plays a positive role in regulating stem cell proliferation and in remodeling the hostile milieu of infarcted myocardium. Greater understanding of LLLI's underlying mechanisms would be helpful in translating cell transplantation therapy into the clinic. METHODS Studies investigating LLLI preconditioning for cardiac regenerative therapy published up to 2015 were retrieved from library sources and Pubmed databases. RESULTS LLLI preconditioning stimulates proliferation and differentiation of stem cells through activation of cell proliferation signaling pathways and alteration of microRNA expression. It also could stimulate paracrine secretion of stem cells and alter cardiac cytokine expression in infarcted myocardium. CONCLUSIONS LLLI preconditioning provides a promising approach to maximize the efficacy of cardiac cell-based therapy. Although many studies have reported possible molecular mechanisms involved in LLLI preconditioning, the exact mechanisms are still not clearly understood.
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Affiliation(s)
- Yiwei Liu
- State Key Laboratory of Cardiovascular Disease and Key laboratory of Cardiac Regenerative Medicine, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing, China
| | - Hao Zhang
- State Key Laboratory of Cardiovascular Disease and Key laboratory of Cardiac Regenerative Medicine, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing, China
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Comparison of subthreshold diode laser micropulse therapy versus conventional photocoagulation laser therapy as primary treatment of diabetic macular edema. J Curr Ophthalmol 2016; 28:206-211. [PMID: 27830205 PMCID: PMC5093846 DOI: 10.1016/j.joco.2016.08.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 08/15/2016] [Accepted: 08/15/2016] [Indexed: 11/24/2022] Open
Abstract
PURPOSE The aim of the present study was to investigate the effect of subthreshold diode laser micropulse (SDM) in comparison with conventional laser photocoagulation in the treatment of the diabetic macular edema (DME). METHODS Sixty-eight eyes from 68 patients with clinically significant DME were divided randomly into two equal groups. In the first group, SDM photocoagulation was employed, while conventional laser photocoagulation was performed on the eyes of the second group. Central macular thickness (CMT), central macular volume (CMV), and best corrected visual acuity (BCVA) were measured before, 2, and 4 months after intervention, and the results were compared. RESULTS The mean CMT was 357.3 and 354.8 microns before the treatment in Groups 1 and 2, respectively (P = 0.85), and decreased significantly to 344.3 and 349.8 after 4 months, respectively (P = 0.012 and P = 0.049). The changes in the central macular thickness was statistically higher in the first group (P = 0.001). The mean CMV significantly decreased in Group 1 (P = 0.003), but it was similar to pretreatment in Group 2 after 4 months (P = 0.31). The BCVA improved significantly in Group 1 (P < 0.001), but it remained unchanged in Group 2 (P = 0.38). CONCLUSIONS In this study, SDM was more effective than conventional laser photocoagulation in reducing CMT and CMV and improving visual acuity in patients with DME.
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159
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Borzabadi-Farahani A. Effect of low-level laser irradiation on proliferation of human dental mesenchymal stem cells; a systemic review. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2016; 162:577-582. [PMID: 27475781 DOI: 10.1016/j.jphotobiol.2016.07.022] [Citation(s) in RCA: 297] [Impact Index Per Article: 37.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 07/18/2016] [Indexed: 10/21/2022]
Abstract
CONTEXT Identification of factors that enhance the proliferation of human dental mesenchymal stem cells (DMSCs) is vital to facilitate tissue regeneration. The role of low-level laser irradiation (LLLI) on proliferation of human DMSCs has not been well established. OBJECTIVE To assess the effect of LLLI on proliferation of human DMSCs when applied in-vitro. DATA SOURCES Electronic search of literature was conducted (2000-2016) on PubMed, Web of Science, and Scopus databases. Search terms included low-level light therapy, low-level laser irradiation, low-level light irradiation, LLLT, humans, adolescent, adult, cells, cultured, periodontal ligament, dental pulp, stem cells, dental pulp stem cells, mesenchymal stem cells, periodontal ligament stem cell, deciduous teeth, cell proliferation, adult stem cells, radiation, and proliferation. RESULTS The literature search identified 165 studies with 6 being eligible for inclusion; all used diode lasers; 5 studies used InGaAIP diode lasers; 4 used 660nm, and the other two applied 810nm or 980nm wavelength LLLI. The distance between the DMSCs and the laser spot ranged between 0.5mm to 2mm. The time intervals of cell proliferation analysis ranged from 0h to 7days after LLLI. After 660nm LLLI, an increase in the DMSC's proliferation was reported [DMSCs extracted from dental pulp of deciduous teeth (two irradiations, 3J/cm(2), 20mW was more effective than 40mW), adult teeth (two irradiations, 0.5 and 1.0J/cm(2), 30mW), and from adult periodontal ligament (two irradiations, 1.0J/cm(2) was more effective than 0.5J/cm(2), 30mW)]. Similarly, an increase in the proliferation of DMSCs extracted from dental pulp of adult teeth was reported after 810nm LLLI (7 irradiations in 7days, 0.1 and 0.2J/cm(2), 60mW) or 980nm LLLI (single irradiation, 3J/cm(2), 100mW). However, 660nm LLLI in one study did not increase the proliferation of DMSCs (single irradiation, energy densities of 0.05, 0.30, 7, and 42J/cm(2), 28mW). CONCLUSION There is limited evidence that in-vitro LLLI (660/810/980nm, with energy densities of 0.1-3J/cm(2)) increases the proliferation of DMSCs. Considering the limited evidence and their method heterogeneity it is difficult to reach a firm conclusion. Further research is necessary to identify the optimal characteristics of the LLLI setting (wave length, energy density, power output, frequency/duration of irradiations, distance between the cells and the laser spot/probe) to increase proliferation of DMSCs, and assess its impact on replicative senescence, as well as determine feasibility of the use in the clinical setting.
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Affiliation(s)
- Ali Borzabadi-Farahani
- Orthodontics, Department of Clinical Sciences and Translational Medicine, Univeristy of Rome Tor Vergata, Rome, Italy; Warwick Medical School, University of Warwick, Coventry, and Specialist Orthodontic Practice, London, United Kingdom.
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160
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The effects of low-level laser irradiation on breast tumor in mice and the expression of Let-7a, miR-155, miR-21, miR125, and miR376b. Lasers Med Sci 2016; 31:1775-1782. [DOI: 10.1007/s10103-016-2049-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2016] [Accepted: 08/05/2016] [Indexed: 12/20/2022]
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161
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Guo J, Wang Q, Wai D, Zhang QZ, Shi SH, Le AD, Shi ST, Yen SLK. Visible red and infrared light alters gene expression in human marrow stromal fibroblast cells. Orthod Craniofac Res 2016; 18 Suppl 1:50-61. [PMID: 25865533 DOI: 10.1111/ocr.12081] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/16/2014] [Indexed: 12/29/2022]
Abstract
OBJECTIVES This study tested whether or not gene expression in human marrow stromal fibroblast (MSF) cells depends on light wavelength and energy density. MATERIALS AND METHODS Primary cultures of isolated human bone marrow stem cells (hBMSC) were exposed to visible red (VR, 633 nm) and infrared (IR, 830 nm) radiation wavelengths from a light emitting diode (LED) over a range of energy densities (0.5, 1.0, 1.5, and 2.0 Joules/cm2) Cultured cells were assayed for cell proliferation, osteogenic potential, adipogenesis, mRNA and protein content. mRNA was analyzed by microarray and compared among different wavelengths and energy densities. Mesenchymal and epithelial cell responses were compared to determine whether responses were cell type specific. Protein array analysis was used to further analyze key pathways identified by microarrays. RESULT Different wavelengths and energy densities produced unique sets of genes identified by microarray analysis. Pathway analysis pointed to TGF-beta 1 in the visible red and Akt 1 in the infrared wavelengths as key pathways to study. TGF-beta protein arrays suggested switching from canonical to non-canonical TGF-beta pathways with increases to longer IR wavelengths. Microarrays suggest RANKL and MMP 10 followed IR energy density dose-response curves. Epithelial and mesenchymal cells respond differently to stimulation by light suggesting cell type-specific response is possible. CONCLUSIONS These studies demonstrate differential gene expression with different wavelengths, energy densities and cell types. These differences in gene expression have the potential to be exploited for therapeutic purposes and can help explain contradictory results in the literature when wavelengths, energy densities and cell types differ.
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Affiliation(s)
- J Guo
- Center for Craniofacial Molecular Biology, Ostrow School of Dentistry, University of Southern California, Los Angeles, CA, USA; Department of Orthodontics, School of Stomatology, Shandong University, Jinan, China
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162
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Ren C, McGrath C, Jin L, Zhang C, Yang Y. Effect of diode low-level lasers on fibroblasts derived from human periodontal tissue: a systematic review of in vitro studies. Lasers Med Sci 2016; 31:1493-510. [DOI: 10.1007/s10103-016-2026-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 07/05/2016] [Indexed: 10/21/2022]
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163
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Basso FG, Soares DG, Pansani TN, Cardoso LM, Scheffel DL, de Souza Costa CA, Hebling J. Proliferation, migration, and expression of oral-mucosal-healing-related genes by oral fibroblasts receiving low-level laser therapy after inflammatory cytokines challenge. Lasers Surg Med 2016; 48:1006-1014. [DOI: 10.1002/lsm.22553] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/16/2016] [Indexed: 01/20/2023]
Affiliation(s)
- Fernanda G. Basso
- Araraquara School of Dentistry; UNESP-Univ. Estadual Paulista; Araraquara, SP 14.801-903 Brazil
| | - Diana G. Soares
- Araraquara School of Dentistry; UNESP-Univ. Estadual Paulista; Araraquara, SP 14.801-903 Brazil
| | - Taisa N. Pansani
- Araraquara School of Dentistry; UNESP-Univ. Estadual Paulista; Araraquara, SP 14.801-903 Brazil
| | - Lais M. Cardoso
- Araraquara School of Dentistry; UNESP-Univ. Estadual Paulista; Araraquara, SP 14.801-903 Brazil
| | - Débora L. Scheffel
- Araraquara School of Dentistry; UNESP-Univ. Estadual Paulista; Araraquara, SP 14.801-903 Brazil
| | | | - Josimeri Hebling
- Araraquara School of Dentistry; UNESP-Univ. Estadual Paulista; Araraquara, SP 14.801-903 Brazil
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164
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Low-Level Laser Therapy (904 nm) Counteracts Motor Deficit of Mice Hind Limb following Skeletal Muscle Injury Caused by Snakebite-Mimicking Intramuscular Venom Injection. PLoS One 2016; 11:e0158980. [PMID: 27392016 PMCID: PMC4938492 DOI: 10.1371/journal.pone.0158980] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 06/25/2016] [Indexed: 11/19/2022] Open
Abstract
Myotoxins present in Bothrops venom disrupt the sarcolemma of muscle fibers leading to the release of sarcoplasmic proteins and loss of muscle homeostasis. Myonecrosis and tissue anoxia induced by vascularization impairment can lead to amputation or motor functional deficit. The objective of this study was to investigate the dynamic behavior of motor function in mice subjected to injection of Bothrops jararacussu venom (Bjssu) and exposed to low-level laser therapy (LLLT). Male Swiss mice received Bjssu injection (830 μg/kg) into the medial portion of the right gastrocnemius muscle. Three hours later the injected region was irradiated with diode semiconductor Gallium Arsenide (GaAs- 904 nm, 4 J/cm²) laser following by irradiation at 24, 48 and 72 hours. Saline injection (0.9% NaCl) was used as control. Gait analysis was performed 24 hours before Bjssu injection and at every period post-Bjssu using CatWalk method. Data from spatiotemporal parameters Stand, Maximum Intensity, Swing, Swing Speed, Stride Length and Step Cycle were considered. The period of 3 hours post venom-induced injury was considered critical for all parameters evaluated in the right hindlimb. Differences (p<0.05) were concentrated in venom and venom + placebo laser groups during the 3 hours post-injury period, in which the values of stand of most animals were null. After this period, the gait characteristics were re-established for all parameters. The venom + laser group kept the values at 3 hours post-Bjssu equal to that at 24 hours before Bjssu injection indicating that the GaAs laser therapy improved spatially and temporally gait parameters at the critical injury period caused by Bjssu. This is the first study to analyze with cutting edge technology the gait functional deficits caused by snake envenoming and gait gains produced by GaAs laser irradiation. In this sense, the study fills a gap on the field of motor function after laser treatment following snake envenoming.
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165
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Höfling DB, Chavantes MC, Acencio MMP, Cerri GG, Marui S, Yoshimura EM, Chammas MC. Effects of low-level laser therapy on the serum TGF-β1 concentrations in individuals with autoimmune thyroiditis. Photomed Laser Surg 2016; 32:444-9. [PMID: 25101534 DOI: 10.1089/pho.2014.3716] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVE The objective of this study was to evaluate the serum concentration of transforming growth factor-β1 (TGF-β1) after low-level laser therapy (LLLT) in patients with hypothyroidism resulting from chronic autoimmune thyroiditis (CAT). BACKGROUND DATA Certain data indicate that LLLT is effective in patients with hypothyroidism caused by CAT; however, the mechanisms of action of LLLT in thyroid tissue are unknown. Cytokines could play a role in the response to LLLT. METHODS A randomized, placebo-controlled trial included 43 patients with a history of levothyroxine therapy for CAT-induced hypothyroidism. The patients were randomly assigned to receive either 10 sessions of LLLT (830 nm, 50 mW output power, and 707 J/cm(2) fluence; L group, n=23) or 10 sessions of a placebo treatment (P group, n=20) twice a week. Levothyroxine was maintained at the same dose during the entire study period. TGF-β1 was measured both pre-intervention and 30 days post-intervention in both groups. The differences were calculated between the TGF-β1 values observed 30 days post-intervention and the pre-intervention TGF-β1 values for each group (intragroup). RESULTS Comparing the differences in TGF-β1 levels between the L group (874.9±541.7 pg/mL) and the P group (-128.4±832.8 pg/mL) revealed that there was a statistically significant increase in TGF-β1 levels 30 days post-intervention in group L compared with the placebo group (p=0.0379). CONCLUSIONS This finding suggested that the significant increase in serum TGF-β1 levels in patients with CAT-induced hypothyroidism was associated with the thyroid LLLT procedure. Future studies of the effect of LLLT on TGF-β1 gene expression in thyroid tissue are necessary to confirm these findings.
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Affiliation(s)
- Danilo B Höfling
- 1 Ultrasound Unit, Department of Radiology, Hospital das Clínicas, University of Sao Paulo Medical School , São Paulo, SP, Brazil
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166
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Amber Light (590 nm) Induces the Breakdown of Lipid Droplets through Autophagy-Related Lysosomal Degradation in Differentiated Adipocytes. Sci Rep 2016; 6:28476. [PMID: 27346059 PMCID: PMC4921916 DOI: 10.1038/srep28476] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 06/03/2016] [Indexed: 11/08/2022] Open
Abstract
Lipolysis in the adipocytes provides free fatty acids for other tissues in response to the energy demand. With the rapid increase in obesity-related diseases, finding novel stimuli or mechanisms that regulate lipid metabolism becomes important. We examined the effects of visible light (410, 457, 505, 530, 590, and 660 nm) irradiation on lipolysis regulation in adipocytes differentiated from human adipose-derived stem cells (ADSCs). Interestingly, 590 nm (amber) light irradiation significantly reduced the concentration of lipid droplets (LDs). We further investigated the lipolytic signaling pathways that are involved in 590 nm light irradiation-induced breakdown of LDs. Immunoblot analysis revealed that 590 nm light irradiation-induced phosphorylation of hormone-sensitive lipase (HSL) was insufficient to promote reduction of LDs. We observed that 590 nm light irradiation decreased the expression of perilipin 1. We found that 590 nm light irradiation, but not 505 nm, induced conversion of LC3 I to LC3 II, a representative autophagic marker. We further demonstrated that the lysosomal inhibitors leupeptin/NH4Cl inhibited 590 nm light irradiation-induced reduction of LDs in differentiated adipocytes. Our data suggest that 590 nm light irradiation-induced LD breakdown is partially mediated by autophagy-related lysosomal degradation, and can be applied in clinical settings to reduce obesity.
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Ashworth BE, Stephens E, Bartlett CA, Serghiou S, Giacci MK, Williams A, Hart NS, Fitzgerald M. Comparative assessment of phototherapy protocols for reduction of oxidative stress in partially transected spinal cord slices undergoing secondary degeneration. BMC Neurosci 2016; 17:21. [PMID: 27194427 PMCID: PMC4872332 DOI: 10.1186/s12868-016-0259-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2015] [Accepted: 05/11/2016] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Red/near-infrared light therapy (R/NIR-LT) has been developed as a treatment for a range of conditions, including injury to the central nervous system (CNS). However, clinical trials have reported variable or sub-optimal outcomes, possibly because there are few optimized treatment protocols for the different target tissues. Moreover, the low absolute, and wavelength dependent, transmission of light by tissues overlying the target site make accurate dosing problematic. RESULTS In order to optimize light therapy treatment parameters, we adapted a mouse spinal cord organotypic culture model to the rat, and characterized myelination and oxidative stress following a partial transection injury. The ex vivo model allows a more accurate assessment of the relative effect of different illumination wavelengths (adjusted for equal quantal intensity) on the target tissue. Using this model, we assessed oxidative stress following treatment with four different wavelengths of light: 450 nm (blue); 510 nm (green); 660 nm (red) or 860 nm (infrared) at three different intensities: 1.93 × 10(16) (low); 3.85 × 10(16) (intermediate) and 7.70 × 10(16) (high) photons/cm(2)/s. We demonstrate that the most effective of the tested wavelengths to reduce immunoreactivity of the oxidative stress indicator 3-nitrotyrosine (3NT) was 660 nm. 860 nm also provided beneficial effects at all tested intensities, significantly reducing oxidative stress levels relative to control (p ≤ 0.05). CONCLUSIONS Our results indicate that R/NIR-LT is an effective antioxidant therapy, and indicate that effective wavelengths and ranges of intensities of treatment can be adapted for a variety of CNS injuries and conditions, depending upon the transmission properties of the tissue to be treated.
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Affiliation(s)
- Bethany Eve Ashworth
- />Experimental and Regenerative Neurosciences, School of Animal Biology, The University of Western Australia, Crawley, WA Australia
- />Department of Biology and Biochemistry, The University of Bath, Bath, UK
| | - Emma Stephens
- />Experimental and Regenerative Neurosciences, School of Animal Biology, The University of Western Australia, Crawley, WA Australia
- />Department of Biology and Biochemistry, The University of Bath, Bath, UK
| | - Carole A. Bartlett
- />Experimental and Regenerative Neurosciences, School of Animal Biology, The University of Western Australia, Crawley, WA Australia
| | - Stylianos Serghiou
- />Centre for Regenerative Medicine, University of Edinburgh, Edinburgh, UK
| | - Marcus K. Giacci
- />Experimental and Regenerative Neurosciences, School of Animal Biology, The University of Western Australia, Crawley, WA Australia
| | - Anna Williams
- />Centre for Regenerative Medicine, University of Edinburgh, Edinburgh, UK
| | - Nathan S. Hart
- />Experimental and Regenerative Neurosciences, School of Animal Biology, The University of Western Australia, Crawley, WA Australia
- />Department of Biological Sciences, Macquarie University, Sydney, NSW 2109 Australia
| | - Melinda Fitzgerald
- />Experimental and Regenerative Neurosciences, School of Animal Biology, The University of Western Australia, Crawley, WA Australia
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Ribeiro BG, Alves AN, dos Santos LAD, Cantero TM, Fernandes KPS, Dias DDS, Bernardes N, De Angelis K, Mesquita-Ferrari RA. Red and Infrared Low-Level Laser Therapy Prior to Injury with or without Administration after Injury Modulate Oxidative Stress during the Muscle Repair Process. PLoS One 2016; 11:e0153618. [PMID: 27082964 PMCID: PMC4833286 DOI: 10.1371/journal.pone.0153618] [Citation(s) in RCA: 263] [Impact Index Per Article: 32.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 03/31/2016] [Indexed: 11/30/2022] Open
Abstract
INTRODUCTION Muscle injury is common among athletes and amateur practitioners of sports. Following an injury, the production of reactive oxygen species (ROS) occurs, which can harm healthy muscle fibers (secondary damage) and delay the repair process. Low-level laser therapy (LLLT) administered prior to or following an injury has demonstrated positive and protective effects on muscle repair, but the combination of both administration times together has not been clarified. AIM To evaluate the effect of LLLT (660 nm and 780 nm, 10 J/cm², 40 mW, 3.2 J) prior to injury with or without the administration after injury on oxidative stress during the muscle repair process. METHODS Wistar rats were divided into following groups: control; muscle injury alone; LLLT 660 nm + injury; LLLT 780 nm + injury; LLLT 660 nm before and after injury; and LLLT 780 nm before and after injury. The rats were euthanized on days 1, 3 and 7 following cryoinjury of the tibialis anterior (TA) muscle, which was then removed for analysis. RESULTS Lipid peroxidation decreased in the 660+injury group after one day. Moreover, red and infrared LLLT employed at both administration times induced a decrease in lipid peroxidation after seven days. CAT activity was altered by LLLT in all periods evaluated, with a decrease after one day in the 780+injury+780 group and after seven days in the 780+injury group as well as an increase in the 780+injury and 780+injury+780 groups after three days. Furthermore, increases in GPx and SOD activity were found after seven days in the 780+injury+780 group. CONCLUSION The administration of red and infrared laser therapy at different times positively modulates the activity of antioxidant enzymes and reduces stress markers during the muscle repair process.
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Affiliation(s)
| | - Agnelo Neves Alves
- Rehabilitation Department, Universidade Nove de Julho (UNINOVE), São Paulo, SP, Brazil
| | | | | | | | | | - Nathalia Bernardes
- Hypertension Unit, Heart Institute (InCor), School of Medicine, University of São Paulo, São Paulo, SP, Brazil
| | - Kátia De Angelis
- Rehabilitation Department, Universidade Nove de Julho (UNINOVE), São Paulo, SP, Brazil
- Medicine Department, Universidade Nove de Julho (UNINOVE), São Paulo, SP, Brazil
| | - Raquel Agnelli Mesquita-Ferrari
- Rehabilitation Department, Universidade Nove de Julho (UNINOVE), São Paulo, SP, Brazil
- Biophotonics Department, Universidade Nove de Julho (UNINOVE), São Paulo, SP, Brazil
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169
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Fekrazad R, Asefi S, Allahdadi M, Kalhori KAM. Effect of Photobiomodulation on Mesenchymal Stem Cells. Photomed Laser Surg 2016; 34:533-542. [PMID: 27070113 DOI: 10.1089/pho.2015.4029] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE The purpose of this study was to review available literature about the effect of photobiomodulation (PBM) on mesenchymal stem cells (MSCs). BACKGROUND DATA The effects of coherent and noncoherent light sources such as low-level lasers and light-emitting diodes (LEDs) on cells and tissues, known as PBM, form the basis of photomedicine. This treatment technique effects cell function, proliferation, and migration, and plays an important role in tissue regeneration. Stem cells have been found to be helpful elements in tissue regeneration, and the combination of stem cell therapy and laser therapy appears to positively affect treatment results. MATERIALS AND METHODS An electronic search in PubMed was conducted of publications from the previous 12 years. English language articles related to the subject were found using selected key words. The full texts of potentially suitable articles were assessed according to inclusion and exclusion criteria. RESULTS After evaluation, 30 articles were deemed relevant according to the inclusion criteria. The energy density of the laser was 0.7-9 J/cm2. The power used for visible light was 30-110 mW and that used for infrared light was 50-800 mW. Nearly all studies showed that low-level laser therapy had a positive effect on cell proliferation. Similar outcomes were found for LED; however, some studies suggest that the laser alone is not effective, and should be used as an adjunct tool. CONCLUSIONS PBM has positive effects on MSCs. This review concluded that doses of 0.7-4 J/cm2 and wavelengths of 600-700 nm are appropriate for light therapy. The results were dependent upon different parameters; therefore, optimization of parameters used in light therapy to obtain favorable results is required to provide more accurate comparison.
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Affiliation(s)
- Reza Fekrazad
- 1 Dental Faculty, Periodontology Department, AJA University of Medical sciences , Tehran, Iran
| | - Sohrab Asefi
- 2 Postgraduate of Orthodontics, Shahid Beheshti University of Medical Sciences , Tehran, Iran
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170
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Gagnon D, Gibson TWG, Singh A, zur Linden AR, Kazienko JE, LaMarre J. An in vitro method to test the safety and efficacy of low-level laser therapy (LLLT) in the healing of a canine skin model. BMC Vet Res 2016; 12:73. [PMID: 27056043 PMCID: PMC4825076 DOI: 10.1186/s12917-016-0689-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2015] [Accepted: 03/22/2016] [Indexed: 12/29/2022] Open
Abstract
Background Low-level laser therapy (LLLT) has been used clinically as a treatment modality for a variety of medical conditions including wound-healing processes. It is an attractive and emerging method to enhance wound healing and improve clinical outcomes both in human and veterinary medicine. Despite the fact that the use of LLLT continues to gain in popularity, there is no universally accepted theory that defends all its cellular effects and beneficial biological processes in tissue repair. The present study was designed to evaluate the effect of LLLT on cellular migration and proliferation of cultured canine epidermal keratinocytes (CPEK) in an in vitro wound healing model. Results Keratinocyte migration and proliferation were assessed using a scratch migration assay and a proliferation assay, respectively. Fifteen independent replicates were performed for each assay. Canine epidermal keratinocyte cells exposed to LLLT with 0.1, 0.2, and 1.2 J/cm2 migrated significantly more rapidly (p < 0.03) and showed significantly higher rates of proliferation (p < 0.0001) compared to non-irradiated cells cultured in the same medium and cells exposed to the higher energy dose of 10 J/cm2. Irradiation with 10 J/cm2 was characterized by decreased cellular migration and proliferation. These results revealed that LLLT has a measurable, dose-dependent effect on two different aspects of keratinocyte biology in vitro. Conclusion In this in vitro wound-healing model, LLLT increased cellular migration and proliferation at doses of 0.1, 0.2, and 1.2 J/cm2 while exposure to 10 J/cm2 decreased cellular migration and proliferation. These data suggest that the beneficial effects of LLLT in vivo may be due, in part, to effects on keratinocyte behavior.
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Affiliation(s)
- Dominique Gagnon
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2 W1, Canada.
| | - Thomas W G Gibson
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2 W1, Canada
| | - Ameet Singh
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2 W1, Canada
| | - Alex R zur Linden
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2 W1, Canada
| | - Jaimie E Kazienko
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2 W1, Canada
| | - Jonathan LaMarre
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2 W1, Canada
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Basso FG, Turrioni APS, Almeida LF, Soares DG, Oliveira CF, Hebling J, de Souza Costa CA. Nutritional deprivation and LPS exposure as feasible methods for induction of cellular - A methodology to validate for vitro photobiomodulation studies. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 159:205-10. [PMID: 27085052 DOI: 10.1016/j.jphotobiol.2016.04.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Accepted: 04/03/2016] [Indexed: 12/19/2022]
Abstract
Previous studies have demonstrated that high biostimulation takes place when cells under stress are subjected to phototherapy by laser or light-emitting-diode (LED) devices. Several studies selected nutritional deprivation by reducing the concentration of fetal bovine serum (FBS) in the culture medium or the exposure of cultured cells to lipopolysaccharide (LPS) as an in vitro cellular stress condition. However, there are no data certifying that these stimuli cause stressful conditions for cultured cells. This investigation assessed the induction of cellular stress by decreasing the concentration of FBS or adding LPS to culture medium. Odontoblast-like cells (MDPC-23) were cultured in complete culture medium (DMEM) containing 10% FBS. After a 12-hour incubation period, the DMEM was replaced by fresh medium containing 10% FBS (control), low concentrations of FBS (0, 0.2, 0.5, 2, or 5%) or LPS from Escherichia coli (10μg/ml). After an additional 12-hour incubation, cell viability, total cell-counting, total protein production, and gene expression of heat shock protein 70 (HSP70) were assessed. Data were statistically analyzed by ANOVA complemented by the Tukey test, with 5% considered significant. Cell viability was negatively affected only for 0% FBS, while reduced viable cell numbers and total protein production were detected for FBS concentrations lower than 2%. Higher HSP70 gene expression was also observed for FBS concentrations lower than 2% and for cells exposed to LPS. The nutritional deprivation model with culture medium lower than 2% of FBS can be safely used to induce cellular stress for in vitro photobiomodulation studies.
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Affiliation(s)
- F G Basso
- Araraquara School of Dentistry - Univ. Estadual Paulista, Araraquara, SP, Brazil
| | - A P S Turrioni
- Araraquara School of Dentistry - Univ. Estadual Paulista, Araraquara, SP, Brazil
| | - L F Almeida
- Araraquara School of Dentistry - Univ. Estadual Paulista, Araraquara, SP, Brazil
| | - D G Soares
- Araraquara School of Dentistry - Univ. Estadual Paulista, Araraquara, SP, Brazil
| | - C F Oliveira
- Universidade de Ribeirão Preto, UNAERP - Ribeirão Preto, SP, Brazil
| | - J Hebling
- Araraquara School of Dentistry - Univ. Estadual Paulista, Araraquara, SP, Brazil
| | - C A de Souza Costa
- Araraquara School of Dentistry - Univ. Estadual Paulista, Araraquara, SP, Brazil.
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Knels L, Valtink M, Piazena H, de la Vega Marin J, Gommel K, Lupp A, Roehlecke C, Mehner M, Funk RHW. Effects of Narrow-band IR-A and of Water-Filtered Infrared A on Fibroblasts. Photochem Photobiol 2016; 92:475-87. [DOI: 10.1111/php.12579] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2015] [Accepted: 01/20/2016] [Indexed: 12/17/2022]
Affiliation(s)
- Lilla Knels
- Institute of Anatomy, Faculty of Medicine; TU Dresden; Dresden Germany
| | - Monika Valtink
- Institute of Anatomy, Faculty of Medicine; TU Dresden; Dresden Germany
| | - Helmut Piazena
- Charité - University Medicine Berlin; Medical Photobiology Group; Berlin Germany
| | | | - Kerstin Gommel
- Institute of Anatomy, Faculty of Medicine; TU Dresden; Dresden Germany
| | - Amelie Lupp
- Institute of Pharmacology and Toxicology; Jena University Hospital; Jena Germany
| | - Cora Roehlecke
- Institute of Anatomy, Faculty of Medicine; TU Dresden; Dresden Germany
| | - Mirko Mehner
- Department of Anaesthesiology and Intensive Care Medicine; Clinical Sensoring and Monitoring; Faculty of Medicine Carl Gustav Carus; TU Dresden; Dresden Germany
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Photobiomodulation on human annulus fibrosus cells during the intervertebral disk degeneration: extracellular matrix-modifying enzymes. Lasers Med Sci 2016; 31:767-77. [PMID: 26987527 DOI: 10.1007/s10103-016-1923-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2015] [Accepted: 03/08/2016] [Indexed: 01/07/2023]
Abstract
Destruction of extracellular matrix (ECM) leads to degeneration of the intervertebral disk (IVD), which is a major contributor to many spine disorders. IVD degeneration is induced by pro-inflammatory cytokines, such as tumor necrosis factor-alpha (TNF-α) and interleukin-1 beta (IL-1β), which are secreted by immune cells, including macrophages and neutrophils. The cytokines modulate ECM-modifying enzymes such as matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) in human annulus fibrosus (AF) cells. The resulting imbalance in catabolic and anabolic enzymes can cause generalized back, neck, and low back pain (LBP). Photobiomodulation (PBM) is known to regulate inflammatory responses and wound healing. The aim of this study was to mimic the degenerative IVD microenvironment, and to investigate the effect of a variety of PBM conditions (wavelength: 635, 525, and 470 nm; energy density: 16, 32, and 64 J/cm(2)) on the production of ECM-modifying-enzymes by AF cells under degenerative conditions induced by macrophage-conditioned medium (MCM), which contains pro-inflammatory cytokines such as TNF-α and IL-β secreted by macrophage during the development of intervertebral disk inflammation. We showed that the MCM-stimulated AF cells express imbalanced ratios of TIMPs (TIMP-1 and TIMP-2) and MMPs (MMP-1 and MMP-3). PBM selectively modulated the production of ECM-modifying enzymes in AF cells. These results suggest that PBM can be a therapeutic tool for degenerative IVD disorders.
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Silveira PCL, Scheffer DDL, Glaser V, Remor AP, Pinho RA, Aguiar Junior AS, Latini A. Low-level laser therapy attenuates the acute inflammatory response induced by muscle traumatic injury. Free Radic Res 2016; 50:503-13. [PMID: 26983894 DOI: 10.3109/10715762.2016.1147649] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The purpose of this work was to investigate the effect of early and long-term low-level laser therapy (LLLT) on oxidative stress and inflammatory biomarkers after acute-traumatic muscle injury in Wistar rats. Animals were randomly divided into the following four groups: control group (CG), muscle injury group (IG), CG + LLLT, and IG + LLLT: laser treatment with doses of 3 and 5 J/cm(2). Muscle traumatic injury was induced by a single-impact blunt trauma in the rat gastrocnemius. Irradiation for 3 or 5 J/cm(2) was initiated 2, 12, and 24 h after muscle trauma induction, and the treatment was continued for five consecutive days. All the oxidant markers investigated. namely thiobarbituric acid-reactive substance, carbonyl, superoxide dismutase, glutathione peroxidase, and catalase, were increased as soon as 2 h after muscle injury and remained increased up to 24 h. These alterations were prevented by LLLT at a 3 J/cm(2) dose given 2 h after the trauma. Similarly, LLLT prevented the trauma-induced proinflammatory state characterized by IL-6 and IL-10. In parallel, trauma-induced reduction in BDNF and VEGF, vascular remodeling and fiber-proliferating markers, was prevented by laser irradiation. In order to test whether the preventive effect of LLLT was also reflected in muscle functionality, we tested the locomotor activity, by measuring distance traveled and the number of rearings in the open field test. LLLT was effective in recovering the normal locomotion, indicating that the irradiation induced biostimulatory effects that accelerated or resolved the acute inflammatory response as well as the oxidant state elicited by the muscle trauma.
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Affiliation(s)
- Paulo Cesar Lock Silveira
- a Laboratório de Bioenergética e Estresse Oxidativo - LABOX, Departamento de Bioquímica , Universidade Federal de Santa Catarina , Florianópolis , Brazil ;,b Laboratório de Fisiologia e Bioquímica do Exercício - LaFiBe , Universidade do Extremo Sul Catarinense , Criciúma , Brazil
| | - Debora da Luz Scheffer
- a Laboratório de Bioenergética e Estresse Oxidativo - LABOX, Departamento de Bioquímica , Universidade Federal de Santa Catarina , Florianópolis , Brazil
| | - Viviane Glaser
- a Laboratório de Bioenergética e Estresse Oxidativo - LABOX, Departamento de Bioquímica , Universidade Federal de Santa Catarina , Florianópolis , Brazil
| | - Aline Pertile Remor
- a Laboratório de Bioenergética e Estresse Oxidativo - LABOX, Departamento de Bioquímica , Universidade Federal de Santa Catarina , Florianópolis , Brazil
| | - Ricardo Aurino Pinho
- b Laboratório de Fisiologia e Bioquímica do Exercício - LaFiBe , Universidade do Extremo Sul Catarinense , Criciúma , Brazil
| | - Aderbal Silva Aguiar Junior
- a Laboratório de Bioenergética e Estresse Oxidativo - LABOX, Departamento de Bioquímica , Universidade Federal de Santa Catarina , Florianópolis , Brazil
| | - Alexandra Latini
- a Laboratório de Bioenergética e Estresse Oxidativo - LABOX, Departamento de Bioquímica , Universidade Federal de Santa Catarina , Florianópolis , Brazil
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Abstract
BACKGROUND The effectiveness of low power lasers on incisional wound healing, because of conflicting results of previous studies, is uncertain. Therefore, the aim of this study was to evaluate the effects of low-level helium-neon (He-Ne) laser irradiation on wound healing in rat's oral mucosa. MATERIALS AND METHODS Sixty-four standardized incisions were carried out on the buccal mucosa of 32 male Wistar divided into four groups of eight animals each. Each rat received two incisions on the opposite sides of the buccal mucosa by a steel scalpel. On the right side (test side), a He-Ne laser (632 nm) was employed on the incision for 40 s. Laser radiation was used just in 1(st) day, 1(st) and 2(nd) day, 1(st) and 3(rd) day, and continuous 3 days in groups of A, B, C, and D of rats, respectively. The left side (control side) did not receive any laser. Histological processing and hematoxylin and eosin staining were done on tissue samples after 5 days. Wilcoxon and Kruskal-Wallis tests were used for statistical analysis. RESULTS Histological analysis showed that the tissue healing after continuous 3 days on the laser irradiated side was better than the control side, but there was no difference between the two sides in each groups (P > 0.05). CONCLUSION This study showed that He-Ne laser had no beneficial effects on incisional oral wound healing particularly in 5 days after laser therapy. Future research in the field of laser effects on oral wound healing in human is recommended.
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Affiliation(s)
- Farimah Sardari
- Department of Oral Medicine, School of Dentistry, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
| | - Farzaneh Ahrari
- Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
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Sonis ST, Hashemi S, Epstein JB, Nair RG, Raber-Durlacher JE. Could the biological robustness of low level laser therapy (Photobiomodulation) impact its use in the management of mucositis in head and neck cancer patients. Oral Oncol 2016; 54:7-14. [DOI: 10.1016/j.oraloncology.2016.01.005] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 01/04/2016] [Accepted: 01/06/2016] [Indexed: 10/22/2022]
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Cell viability, reactive oxygen species, apoptosis, and necrosis in myoblast cultures exposed to low-level infrared laser. Lasers Med Sci 2016; 31:841-8. [PMID: 26886589 DOI: 10.1007/s10103-016-1909-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 02/08/2016] [Indexed: 12/16/2022]
Abstract
Low-level infrared laser is considered safe and effective for treatment of muscle injuries. However, the mechanism involved on beneficial effects of laser therapy are not understood. The aim was to evaluate cell viability, reactive oxygen species, apoptosis, and necrosis in myoblast cultures exposed to low-level infrared laser at therapeutic fluences. C2C12 myoblast cultures at different (2 and 10 %) fetal bovine serum (FBS) concentrations were exposed to low-level infrared laser (808 nm, 100 mW) at different fluences (10, 35, and 70 J/cm(2)) and evaluated after 24, 48, and 72 h. Cell viability was evaluated by WST-1 assay; reactive oxygen species (ROS), apoptosis, and necrosis were evaluated by flow cytometry. Cell viability was decreased atthe lowest FBS concentration. Laser exposure increased the cell viability in myoblast cultures at 2 % FBS after 48 and 72 h, but no significant increase in ROS was observed. Apoptosis was decreased at the higher fluence and necrosis was increased at lower fluence in myoblast cultures after 24 h of laser exposure at 2 % FBS. No laser-induced alterations were obtained at 10 % FBS. Results show that level of reactive oxygen species is not altered, at least to those evaluated in this study, but low-level infrared laser exposure affects cell viability, apoptosis, and necrosis in myoblast cultures depending on laser fluence and physiologic conditions of cells.
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178
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Greaves AJ. The effects of narrowbands of visible light upon some skin disorders: a review. Int J Cosmet Sci 2016; 38:325-45. [DOI: 10.1111/ics.12305] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 12/16/2015] [Indexed: 12/13/2022]
Affiliation(s)
- A. J. Greaves
- L'Oréal Recherche; 1 Avenue Eugène Schueller 93601 Aulnay-Sous-Bois France
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Góralczyk K, Szymańska J, Szot K, Fisz J, Rość D. Low-level laser irradiation effect on endothelial cells under conditions of hyperglycemia. Lasers Med Sci 2016; 31:825-31. [PMID: 26861982 PMCID: PMC4908157 DOI: 10.1007/s10103-016-1880-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 01/14/2016] [Indexed: 11/26/2022]
Abstract
Diabetes mellitus is considered to be a very serious lifestyle disease leading to cardiovascular complications and impaired wound healing observed in the diabetic foot syndrome. Chronic hyperglycemia is the source of the endothelial activation. The inflammatory process in diabetes is associated with the secretion of inflammatory cytokines by endothelial cells, e.g., tumor necrosis factor-alpha (TNF-α) and interleukin 6 (IL-6). The method of phototherapy using laser beam of low power (LLLT-low-level laser therapy) effectively supports the conventional treatment of diabetic vascular complications such as diabetic foot syndrome. The aim of our study was to evaluate the effect of low-power laser irradiation at two wavelengths (635 and 830 nm) on the secretion of inflammatory factors (TNF-α and IL-6) by the endothelial cell culture-HUVEC line (human umbilical vein endothelial cell)-under conditions of hyperglycemia. It is considered that adverse effects of hyperglycemia on vascular endothelial cells may be corrected by the action of LLLT, especially with the wavelength of 830 nm. It leads to the reduction of TNF-α concentration in the supernatant and enhancement of cell proliferation. Endothelial cells play an important role in the pathogenesis of diabetes; however, a small number of studies evaluate an impact of LLLT on these cells under conditions of hyperglycemia. Further work on this subject is warranted.
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Affiliation(s)
- Krzysztof Góralczyk
- Department of Pathophysiology, Faculty of Pharmacy, Nicolaus Copernicus University in Toruń, Collegium Medicum in Bydgoszcz, Skłodowskiej-Curie Street No 9, Bydgoszcz, Poland.
| | - Justyna Szymańska
- Department of Laserotherapy and Physiotherapy, Faculty of Health Sciences, Nicolaus Copernicus University in Toruń, Collegium Medicum in Bydgoszcz, Bydgoszcz, Poland
| | - Katarzyna Szot
- Department of Pathophysiology, Faculty of Pharmacy, Nicolaus Copernicus University in Toruń, Collegium Medicum in Bydgoszcz, Skłodowskiej-Curie Street No 9, Bydgoszcz, Poland
| | - Jacek Fisz
- Department of Laserotherapy and Physiotherapy, Faculty of Health Sciences, Nicolaus Copernicus University in Toruń, Collegium Medicum in Bydgoszcz, Bydgoszcz, Poland
| | - Danuta Rość
- Department of Pathophysiology, Faculty of Pharmacy, Nicolaus Copernicus University in Toruń, Collegium Medicum in Bydgoszcz, Skłodowskiej-Curie Street No 9, Bydgoszcz, Poland
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Liebert AD, Chow RT, Bicknell BT, Varigos E. Neuroprotective Effects Against POCD by Photobiomodulation: Evidence from Assembly/Disassembly of the Cytoskeleton. J Exp Neurosci 2016; 10:1-19. [PMID: 26848276 PMCID: PMC4737522 DOI: 10.4137/jen.s33444] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 12/09/2015] [Accepted: 12/15/2015] [Indexed: 02/07/2023] Open
Abstract
Postoperative cognitive dysfunction (POCD) is a decline in memory following anaesthesia and surgery in elderly patients. While often reversible, it consumes medical resources, compromises patient well-being, and possibly accelerates progression into Alzheimer's disease. Anesthetics have been implicated in POCD, as has neuroinflammation, as indicated by cytokine inflammatory markers. Photobiomodulation (PBM) is an effective treatment for a number of conditions, including inflammation. PBM also has a direct effect on microtubule disassembly in neurons with the formation of small, reversible varicosities, which cause neural blockade and alleviation of pain symptoms. This mimics endogenously formed varicosities that are neuroprotective against damage, toxins, and the formation of larger, destructive varicosities and focal swellings. It is proposed that PBM may be effective as a preconditioning treatment against POCD; similar to the PBM treatment, protective and abscopal effects that have been demonstrated in experimental models of macular degeneration, neurological, and cardiac conditions.
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Affiliation(s)
| | - Roberta T. Chow
- Brain and Mind Institute, University of Sydney, Sydney, NSW, Australia
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181
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Chintavalakorn R, Tanglitanont T, Khantachawana A, Viravaidya-Pasuwat K, Santiwong P. The effect of light-emitting diode irradiation at different wavelengths on calcification of osteoblast-like cells in 3D culture. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2016; 2015:3513-6. [PMID: 26737050 DOI: 10.1109/embc.2015.7319150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
This study aimed to investigate the effect of four different light-emitting diode (LED) wavelengths on calcification and proliferation of osteoblast-like cells in vitro. MC3T3-E1 cells were seeded within three-dimensional collagen scaffolds and irradiated daily by LED light with peak emission wavelengths of 630-, 680-, 760- and 830-nm at constant fluency of 3.1 J/cm(2) (irradiance intensity 2 mW/cm(2)). Cultures were measured for calcium content at day 0, 7, 14, 21, 28, 35 and 42. The significant enhancement in calcium content was observed at the early stage of culture (days 7 and 14) (p<;0.05). After that, the calcium content of irradiated groups was similar to that of the controls group. This suggests the transient effect of light irradiation on osteoblastic cell calcification. Only 680-nm irradiated samples revealed a significant enhancement of calcium content until the late stages of culture (from days 21 to 42) (p<;0.001). The cyclin D mRNA expression that was investigated 3 hours after stimulation at day3 also show that the 680-nm LED irradiation can enhance cyclin D expression more than others. For enhancing bone mineralization, LED irradiation at the 680-nm is more effective than those at 630-, 760- and 830-nm. Further studies should be investigated in order to obtain the most effective parameters of LLLI on bone regeneration in clinical setting.
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182
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Park YG, Roh YJ. New Diagnostic and Therapeutic Approaches for Preventing the Progression of Diabetic Retinopathy. J Diabetes Res 2016; 2016:1753584. [PMID: 26881240 PMCID: PMC4736008 DOI: 10.1155/2016/1753584] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 11/02/2015] [Indexed: 12/13/2022] Open
Abstract
Diabetic retinopathy (DR) is a severe sight-threatening complication of diabetes mellitus. Retinal laser photocoagulation, antivascular endothelial growth factors, steroid therapy, and pars plana vitrectomy are now used extensively to treat advanced stages of diabetic retinopathy. Currently, diagnostic devices like ultrawide field fundus fluorescein angiography and the improvement of optical coherence tomography have provided quicker and more precise diagnosis of early diabetic retinopathy. Thus, treatment protocols have been modified accordingly. Various types of lasers, including the subthreshold micropulse laser and RPE-targeting laser, and selective targeted photocoagulation may be future alternatives to conventional retinal photocoagulation, with fewer complications. The new developed intravitreal medications and implants have provided more therapeutic options, with promising results.
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Affiliation(s)
- Young Gun Park
- Department of Ophthalmology and Visual Science, Catholic University of Korea, No. 62 Yeouido-dong, Yeongdeungpo-gu, Seoul 07345, Republic of Korea
| | - Young-Jung Roh
- Department of Ophthalmology and Visual Science, Catholic University of Korea, No. 62 Yeouido-dong, Yeongdeungpo-gu, Seoul 07345, Republic of Korea
- *Young-Jung Roh:
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183
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Mostafavinia A, Masteri Farahani R, Abbasian M, Vasheghani Farahani M, Fridoni M, Zandpazandi S, Ghoreishi SK, Abdollahifar MA, Pouriran R, Bayat M. Effect of Pulsed Wave Low-Level Laser Therapy on Tibial Complete Osteotomy Model of Fracture Healing With an Intramedullary Fixation. IRANIAN RED CRESCENT MEDICAL JOURNAL 2015; 17:e32076. [PMID: 26759725 PMCID: PMC4707291 DOI: 10.5812/ircmj.32076] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Revised: 09/26/2015] [Accepted: 10/06/2015] [Indexed: 01/04/2023]
Abstract
Background: Fractures pose a major worldwide challenge to public health, causing tremendous disability for the society and families. According to recent studies, many in vivo and in vitro experiments have shown the positive effects of PW LLLT on osseous tissue. Objectives: The aim of this study was to evaluate the outcome of infrared pulsed wave low-level laser therapy (PW LLLT) on the fracture healing process in a complete tibial osteotomy in a rat model, which was stabilized by an intramedullary pin. Materials and Methods: This experimental study was conducted at Shahid Beheshti University of Medical Sciences in Tehran, Iran. We performed complete tibial osteotomies in the right tibias for the population of 15 female rats. The rats were divided randomly into three different groups: I) Control rats with untreated bone defects; II) Rats irradiated by a 0.972 J/cm2 PW LLLT; and III) Rats irradiated by a 1.5 J/cm2 PW LLLT. The right tibias were collected six weeks following the surgery and a three-point bending test was performed to gather results. Immediately after biomechanical examination, the fractured bones were prepared for histological examinations. Slides were examined using stereological method. Results: PW LLLT significantly caused an increase in maximum force (N) of biomechanical repair properties for osteotomized tibias in the first and second laser groups (30.0 ± 15.9 and 32.4 ± 13.8 respectively) compared to the control group (8.6 ± 4.5) LSD test, P = 0.019, P = 0.011 respectively). There was a significant increase in the osteoblast count of the first and second laser groups (0.53 ± 0.06, 0.41 ± 0.06 respectively) compared to control group (0.31 ± 0.04) (LSD test, P = 0001, P = 0.007 respectively). Conclusions: This study confirmed the efficacy of PW LLLT on biomechanical strength, trabecular bone volume, callus volume, and osteoblast number of repairing callus in a complete tibial osteotomy animal model at a relatively late stage of the bone healing process.
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Affiliation(s)
- Atarodalsadat Mostafavinia
- Department of Anatomical Sciences and Biology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran
| | - Reza Masteri Farahani
- Department of Anatomical Sciences and Biology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran
| | - Mohammadreza Abbasian
- Department of Orthopedic Surgery, Akhtar Hospital, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran
| | | | - Mohammadjavad Fridoni
- Department of Anatomy, Medical Faculty, Zanjan University of Medical Sciences, Zanjan, IR Iran
| | - Sara Zandpazandi
- Medical School, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran
| | | | - Mohammad Amin Abdollahifar
- Department of Anatomical Sciences and Biology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran
| | - Ramin Pouriran
- Medical School, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran
| | - Mohammad Bayat
- Department of Anatomical Sciences and Biology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran
- Corresponding Author: Mohammad Bayat, Department of Anatomical Sciences and Biology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran. Tel: +98-2122439976, Fax: +98-2122439976, E-mail:
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184
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Zhou X, Wang Y, Si J, Zhou R, Gan L, Di C, Xie Y, Zhang H. Laser controlled singlet oxygen generation in mitochondria to promote mitochondrial DNA replication in vitro. Sci Rep 2015; 5:16925. [PMID: 26577055 PMCID: PMC4649627 DOI: 10.1038/srep16925] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Accepted: 10/21/2015] [Indexed: 01/26/2023] Open
Abstract
Reports have shown that a certain level of reactive oxygen species (ROS) can promote mitochondrial DNA (mtDNA) replication. However, it is unclear whether it is the mitochondrial ROS that stimulate mtDNA replication and this requires further investigation. Here we employed a photodynamic system to achieve controlled mitochondrial singlet oxygen (1O2) generation. HeLa cells incubated with 5-aminolevulinic acid (ALA) were exposed to laser irradiation to induce 1O2 generation within mitochondria. Increased mtDNA copy number was detected after low doses of 630 nm laser light in ALA-treated cells. The stimulated mtDNA replication was directly linked to mitochondrial 1O2 generation, as verified using specific ROS scavengers. The stimulated mtDNA replication was regulated by mitochondrial transcription factor A (TFAM) and mtDNA polymerase γ. MtDNA control region modifications were induced by 1O2 generation in mitochondria. A marked increase in 8-Oxoguanine (8-oxoG) level was detected in ALA-treated cells after irradiation. HeLa cell growth stimulation and G1-S cell cycle transition were also observed after laser irradiation in ALA-treated cells. These cellular responses could be due to a second wave of ROS generation detected in mitochondria. In summary, we describe a controllable method of inducing mtDNA replication in vitro.
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Affiliation(s)
- Xin Zhou
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key laboratory of Heavy Ion Radiation Biology and Medicine Institute of Nuclear Physics, Chinese Academy of Sciences.,Key laboratory of Heavy-ion Radiation Medicine of Gansu Province, Lanzhou 730000, China
| | - Yupei Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key laboratory of Heavy Ion Radiation Biology and Medicine Institute of Nuclear Physics, Chinese Academy of Sciences.,Key laboratory of Heavy-ion Radiation Medicine of Gansu Province, Lanzhou 730000, China.,Graduate School of Chinese Academy of Sciences, Beijing 100039, China
| | - Jing Si
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key laboratory of Heavy Ion Radiation Biology and Medicine Institute of Nuclear Physics, Chinese Academy of Sciences.,Key laboratory of Heavy-ion Radiation Medicine of Gansu Province, Lanzhou 730000, China
| | - Rong Zhou
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key laboratory of Heavy Ion Radiation Biology and Medicine Institute of Nuclear Physics, Chinese Academy of Sciences.,Key laboratory of Heavy-ion Radiation Medicine of Gansu Province, Lanzhou 730000, China
| | - Lu Gan
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key laboratory of Heavy Ion Radiation Biology and Medicine Institute of Nuclear Physics, Chinese Academy of Sciences.,Key laboratory of Heavy-ion Radiation Medicine of Gansu Province, Lanzhou 730000, China
| | - Cuixia Di
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key laboratory of Heavy Ion Radiation Biology and Medicine Institute of Nuclear Physics, Chinese Academy of Sciences.,Key laboratory of Heavy-ion Radiation Medicine of Gansu Province, Lanzhou 730000, China
| | - Yi Xie
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key laboratory of Heavy Ion Radiation Biology and Medicine Institute of Nuclear Physics, Chinese Academy of Sciences.,Key laboratory of Heavy-ion Radiation Medicine of Gansu Province, Lanzhou 730000, China
| | - Hong Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key laboratory of Heavy Ion Radiation Biology and Medicine Institute of Nuclear Physics, Chinese Academy of Sciences.,Key laboratory of Heavy-ion Radiation Medicine of Gansu Province, Lanzhou 730000, China
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185
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LASER RESENSITIZATION OF MEDICALLY UNRESPONSIVE NEOVASCULAR AGE-RELATED MACULAR DEGENERATION: Efficacy and Implications. Retina 2015; 35:1184-94. [PMID: 25650711 DOI: 10.1097/iae.0000000000000458] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE Drug tolerance is the most common cause of treatment failure in neovascular age-related macular degeneration. "Low-intensity/high-density" subthreshold diode micropulse laser (SDM) has been reported effective for a number of retinal disorders without adverse effects. It has been proposed that SDM normalizes retinal pigment epithelial function. On this basis, it has been postulated that SDM treatment might restore responsiveness to anti-vascular endothelial growth factor drugs in drug-tolerant eyes. METHODS Subthreshold diode micropulse laser treatment was performed in consecutive eyes unresponsive to all anti-vascular endothelial growth factor drugs, including at least three consecutive ineffective aflibercept injections. Monthly aflibercept was resumed 1 month after SDM treatment. RESULTS Thirteen eyes of 12 patients, aged 73 to 97 years (average, 84 years), receiving 16 to 67 (average, 34) anti-vascular endothelial growth factor injections before SDM treatment were included and followed for 3 months to 7 months (average, 5 months) after SDM treatment. After SDM treatment and resumption of aflibercept, 92% (12 of 13) of eyes improved, with complete resolution of macular exudation in 69% (9 of 13). Visual acuity remained unchanged. Central and maximum macular thicknesses significantly improved. CONCLUSION Subthreshold diode micropulse laser treatment restored drug response in drug-tolerant eyes with neovascular age-related macular degeneration. Based on these findings, a theory of SDM action is proposed, suggesting a wider role for SDM as retinal reparative/protective therapy.
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186
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Soto M, Lalla RV, Gouveia RV, Zecchin VG, Seber A, Lopes NNF. Pilot Study on the Efficacy of Combined Intraoral and Extraoral Low-Level Laser Therapy for Prevention of Oral Mucositis in Pediatric Patients Undergoing Hematopoietic Stem Cell Transplantation. Photomed Laser Surg 2015; 33:540-6. [DOI: 10.1089/pho.2015.3954] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Affiliation(s)
- Marcos Soto
- Pediatric Oncology Institute, GRAACC, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Rajesh V. Lalla
- Section of Oral Medicine, University of Connecticut Health Center, Farmington, Connecticut
| | | | | | - Adriana Seber
- Pediatric Oncology Institute, GRAACC, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Nilza Nelly Fontana Lopes
- Division of Dentistry, Pediatric Oncology Institute, GRAACC, Universidade Federal de São Paulo, São Paulo, Brazil
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187
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Effect of Nd:YAG Low Level Laser Therapy on Human Gingival Fibroblasts. Int J Dent 2015; 2015:258941. [PMID: 26504463 PMCID: PMC4609450 DOI: 10.1155/2015/258941] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Revised: 09/05/2015] [Accepted: 09/09/2015] [Indexed: 11/26/2022] Open
Abstract
Aim. To evaluate the effect of Low Level Laser Therapy (LLLT) on human gingival fibroblasts in terms of proliferation and growth factors' secretion (EGF, bFGF, and VEGF). Materials and Methods. Primary cultures of keratinized mucosa fibroblasts were irradiated by a Nd:YAG laser 1064 nm with the following energy densities: 2.6 J/cm2, 5.3 J/cm2, 7.9 J/cm2, and 15.8 J/cm2. Controls were not irradiated. Cultures were examined for cell proliferation and growth factors' secretion after 24, 48, and 72 hours. All experimental procedures were performed in duplicate. Data were analyzed by Student's t-test (p < 0.05). Results. All laser-irradiation doses applied promoted a higher cell proliferation at 48 hours in a dose-response relationship compared to controls. This difference reached statistical significance for the cultures receiving 15.8 J/cm2 (p = 0.03). Regarding EGF, all laser irradiation doses applied promoted a higher secretion at 48 hours in a reverse dose-response pattern compared to controls. This difference reached statistical significance for the cultures receiving 2.6 J/cm2 (p = 0.04). EGF levels at the other time points, bFGF, and VEGF showed a random variation between the groups. Conclusion. Within the limits of this study, LLLT (Nd:YAG) may induce gingival fibroblasts' proliferation and upregulate the secretion of EGF. Further studies are needed to confirm these results.
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188
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Liang WZ, Liu PF, Fu E, Chung HS, Jan CR, Wu CH, Shu CW, Hsieh YD. Selective cytotoxic effects of low-power laser irradiation on human oral cancer cells. Lasers Surg Med 2015; 47:756-64. [PMID: 26395333 DOI: 10.1002/lsm.22419] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/08/2015] [Indexed: 12/26/2022]
Abstract
BACKGROUND AND OBJECTIVES Low-power laser irradiation (LPLI) is known to regulate cell proliferation and migration in clinical use. Recent studies have shown that LPLI induces cell death in some certain types of cancer cell lines. However, the cytotoxic selectivity of LPLI for cancer cells is not fully understood. The aim of this study was to compare the cytotoxic effects of LPLI in both human oral cancer OC2 cells and normal human gingival fibroblast (HGF) cells. MATERIALS AND METHODS LPLI at 810 nm with an energy density from 10 to 60 J/cm(2) was used to irradiate human oral cancer OC2 cells and normal HGF cells. RESULTS We found that LPLI significantly diminished cell viability of human oral cancer OC2 cells due to cell cycle arrest at the G1 phase and the induction of cell death but that it had no or little effects on cell cycle progression and death in normal HGF cells. Moreover, the production of reactive oxygen species (ROS) and the loss of mitochondrial membrane potential (MMP) were elevated in human oral cancer OC2 cells compared with the un-irradiated cells. In contrast, these effects remained unchanged in normal HGF cells after exposure to LPLI. LPLI also induced apoptosis in caspase-3 dependent manner in human oral cancer OC2 cells, a mode of action that could be mediated by ROS and mitochondrial damage. CONCLUSION Our findings imply LPLI might be a potential therapy for oral cancers.
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Affiliation(s)
- Wei-Zhe Liang
- Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung, 813, Taiwan
| | - Pei-Feng Liu
- Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung, 813, Taiwan.,Department of Biotechnology, Fooyin University, Kaohsiung, 831, Taiwan
| | - Earl Fu
- Department of Periodontology, School of Dentistry, National Defense Medical Center and Tri-Service General Hospital, Taipei, 114, Taiwan
| | - Hao-Sheng Chung
- Department of Stomatology, Kaohsiung Veteran General Hospital, Kaohsiung, 813, Taiwan
| | - Chung-Ren Jan
- Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung, 813, Taiwan
| | - Chih-Hsuan Wu
- Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung, 813, Taiwan
| | - Chih-Wen Shu
- Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung, 813, Taiwan
| | - Yao-Dung Hsieh
- Department of Periodontology, School of Dentistry, National Defense Medical Center and Tri-Service General Hospital, Taipei, 114, Taiwan.,Department of Stomatology, Kaohsiung Veteran General Hospital, Kaohsiung, 813, Taiwan.,Department of Dentistry, Kaohsiung Veterans General Hospital, Pingtung, 912, Taiwan
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189
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Zaccara IM, Ginani F, Mota-Filho HG, Henriques ÁCG, Barboza CAG. Effect of low-level laser irradiation on proliferation and viability of human dental pulp stem cells. Lasers Med Sci 2015; 30:2259-64. [DOI: 10.1007/s10103-015-1803-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2015] [Accepted: 08/27/2015] [Indexed: 01/09/2023]
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190
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Park SW, Shin KC, Park HJ, Lee IW, Kim HS, Chung SC, Kim JS, Jun JH, Kim B, Bae YM. Diverse effects of a 445 nm diode laser on isometric contraction of the rat aorta. BIOMEDICAL OPTICS EXPRESS 2015; 6:3482-93. [PMID: 26417517 PMCID: PMC4574673 DOI: 10.1364/boe.6.003482] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 08/12/2015] [Accepted: 08/14/2015] [Indexed: 05/13/2023]
Abstract
The usefulness of visible lasers in treating vascular diseases is controversial. It is probable that multiple effects of visible lasers on blood vessels and their unclear mechanisms have hampered the usefulness of this therapy. Therefore, elucidating the precise actions and mechanisms of the effects of lasers on blood vessels would provide insight into potential biomedical applications. Here, using organ chamber isometric contraction measurements, western blotting, patch-clamp, and en face immunohistochemistry, we showed that a 445 nm diode laser contracted rat aortic rings, both by activating endothelial nitric oxide synthase and by increasing oxidative stress. In addition to the effects on the endothelium, the laser also directly relaxed and contracted vascular smooth muscle by inhibiting L-type Ca(2+) channels and by activating protein tyrosine kinases, respectively. Thus, we conclude that exposure to 445 nm laser might contract and dilate blood vessels in the endothelium and smooth muscle via distinct mechanisms.
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Affiliation(s)
- Sang Woong Park
- Department of Physiology, KU Open Innovation Center, Research Institute of Medical Science, Konkuk University School of Medicine, Chungju, Chungbuk 380-701, South Korea
| | - Kyung Chul Shin
- Department of Physiology, KU Open Innovation Center, Research Institute of Medical Science, Konkuk University School of Medicine, Chungju, Chungbuk 380-701, South Korea
| | - Hyun Ji Park
- Department of Physiology, KU Open Innovation Center, Research Institute of Medical Science, Konkuk University School of Medicine, Chungju, Chungbuk 380-701, South Korea
| | - In Wha Lee
- Department of Biomedical Engineering, BK21 + Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Hyung-Sik Kim
- Department of Biomedical Engineering, BK21 + Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Soon-Cheol Chung
- Department of Biomedical Engineering, BK21 + Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Ji-Sun Kim
- Department of Biomedical Engineering, BK21 + Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Jae-Hoon Jun
- Department of Biomedical Engineering, BK21 + Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Chungbuk 380-701, South Korea
| | - Bokyung Kim
- Department of Physiology, KU Open Innovation Center, Research Institute of Medical Science, Konkuk University School of Medicine, Chungju, Chungbuk 380-701, South Korea
| | - Young Min Bae
- Department of Physiology, KU Open Innovation Center, Research Institute of Medical Science, Konkuk University School of Medicine, Chungju, Chungbuk 380-701, South Korea
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191
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Amini F, Najaf Abadi MP, Mollaei M. Evaluating the effect of laser irradiation on bone regeneration in midpalatal suture concurrent to rapid palatal expansion in rats. J Orthod Sci 2015; 4:65-71. [PMID: 26229946 PMCID: PMC4504045 DOI: 10.4103/2278-0203.160237] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Background: Rapid palatal expansion is one of the most important orthopedic treatments that correct the dental and palatal constriction. Stability of the changes partly depend on the rapidity of new bone formation in affected sutures after expansion. The purpose of this study was to investigate the effect of laser irradiation on the healing of midpalatal suture concurrent to the expansion of midpalatal suture in rats. Materials and Methods: A total of 78 male Sprague rats in seven groups were evaluated: A control group of six rats without any treatments and three experimental groups of 24 which underwent palatal expansion for different time periods (7, 14, and 30 days), and each divided into two groups of with and without laser irradiation. Laser therapy was done by gallium-aluminum-arsenide diode laser with 810 nm wavelength and 4 J/cm2 irradiation in days 0, 2, 4, 6, 8, 10, 12, 14 in 4 points (1 labial and 3 palatal points). After sacrificing, the sections were evaluated by histomorphometric and quantitative analysis and results were statistically investigated by independent samples t-test. Results: The results in 7 days, 14 days, and 30 days show that laser therapy can increase the rate of osteogenesis in palatal suture during rapid palatal expansion but the differences in 7 days groups were not significant (P = 0.117) while in 14 days groups (P = 0.032) and 30 days groups were significant (P = 0.001). Most of effectiveness of low-power laser was seen between 14 and 30 days while the laser therapy was stopped. Conclusion: These findings suggest that low-level laser irradiation can increase and accelerate bone regeneration in the midpalatal suture after rapid palatal expansion, hence, reduce retention time.
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Affiliation(s)
- Fariborz Amini
- Department of Orthodontics, Dental Branch, Islamic Azad University, Tehran, Iran
| | | | - Mobina Mollaei
- Department of Orthodontics, Dental Branch, Islamic Azad University, Tehran, Iran
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192
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SUBTHRESHOLD MICROPULSE YELLOW LASER VERSUS SUBTHRESHOLD MICROPULSE INFRARED LASER IN CENTER-INVOLVING DIABETIC MACULAR EDEMA. Retina 2015; 35:1594-603. [DOI: 10.1097/iae.0000000000000521] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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193
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Low Reactive Level Laser Therapy for Mesenchymal Stromal Cells Therapies. Stem Cells Int 2015; 2015:974864. [PMID: 26273309 PMCID: PMC4529981 DOI: 10.1155/2015/974864] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Accepted: 03/14/2015] [Indexed: 12/24/2022] Open
Abstract
Low reactive level laser therapy (LLLT) is mainly focused on the activation of intracellular or extracellular chromophore and the initiation of cellular signaling by using low power lasers. Over the past forty years, it was realized that the laser therapy had the potential to improve wound healing and reduce pain and inflammation. In recent years, the term LLLT has become widely recognized in the field of regenerative medicine. In this review, we will describe the mechanisms of action of LLLT at a cellular level and introduce the application to mesenchymal stem cells and mesenchymal stromal cells (MSCs) therapies. Finally, our recent research results that LLLT enhanced the MSCs differentiation to osteoblast will also be described.
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194
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Feng J, Sun Q, Liu L, Xing D. Photoactivation of TAZ via Akt/GSK3β signaling pathway promotes osteogenic differentiation. Int J Biochem Cell Biol 2015; 66:59-68. [PMID: 26159930 DOI: 10.1016/j.biocel.2015.07.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2015] [Revised: 06/25/2015] [Accepted: 07/03/2015] [Indexed: 02/03/2023]
Abstract
Osteogenesis disorder is involved in osteoporosis and other related bone diseases, in which osteogenic differentiation is essential. Osteogenic differentiation is a complicated process regulated by intricate signal transduction networks. It has been reported that low-power laser irradiation (LPLI) has an osteogenic potential by promoting osteoblast differentiation. However, the molecular mechanisms remain to be understood. In this study, we reveal a novel mechanism that Akt/GSK3β/TAZ (transcriptional co-activator with PDZ-binding motif) signaling pathway plays a crucial role in LPLI-enhanced osteoblast differentiation. Photomodulation by LPLI activated Akt/GSK3β pathway which inhibited TAZ phosphorylation, leading to the increase of TAZ protein level and nuclear aggregation. Meanwhile, knockdown of TAZ suppressed osteogenic differentiation promoted by LPLI. Further study showed that LPLI promoted the interaction between TAZ and core-binding factor 1 (Cbfa1), up-regulating the transcription of osteopontin (OPN) and osteocalcin (OCN) and the activity of alkaline phosphatase (ALP). However, inhibition of Akt/GSK3β pathway reversed the effects of TAZ on osteogenic differentiation induced by LPLI. Taken together, for the first time, we report that LPLI promotes osteoblast differentiation via TAZ activation dependent on Akt/GSK3β signaling pathway.
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Affiliation(s)
- Jie Feng
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Qinyan Sun
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Lei Liu
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Da Xing
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China.
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195
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Morcos N, Omran M, Ghanem H, Elahdal M, Kamel N, Attia E. Phototherapeutic Effect of Low-Level Laser on Thyroid Gland of Gamma-Irradiated Rats. Photochem Photobiol 2015; 91:942-51. [PMID: 25975382 DOI: 10.1111/php.12465] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 04/29/2015] [Indexed: 12/22/2022]
Abstract
One inescapable feature of life on the earth is exposure to ionizing radiation. The thyroid gland is one of the most sensitive organs to gamma-radiation and endocrine disrupters. Low-level laser therapy (LLLT) has been used to stimulate tissue repair, and reduce inflammation. The aim of this study was to gauge the value of using Helium-Neon laser to repair the damaged tissues of thyroid gland after gamma-irradiation. Albino rats were used in this study (144 rats), divided into control, gamma, laser, and gamma plus laser-irradiated groups, each group was divided into six subgroups according to time of treatment (total six sessions). Rats were irradiated once with gamma radiation (6 Gy), and an external dose of laser (Wavelength 632.8 nm, 12 mW, CW, Illuminated area 5.73 cm(2), 2.1 mW cm(-2) 120 s, 1.4 J, 0.252 J cm(-2)) twice weekly localized on thyroid region of the neck, for a total of six sessions. Animals were sacrificed after each session. Analysis included thyroid function, oxidative stress markers, liver function and blood picture. Results revealed improvement in thyroid function, liver function and antioxidant levels, and the blood cells count after LLLT.
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Affiliation(s)
- Nadia Morcos
- Biochemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Manar Omran
- Radiation Biology Department, National Centre for Radiation Research & Technology (NCRRT), Atomic Energy Authority, Nasr City, Cairo, Egypt
| | - Hala Ghanem
- Biochemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Mahmoud Elahdal
- Radiation Protection and Dosimetry Department, National Centre for Radiation Research & Technology (NCRRT), Atomic Energy Authority, Nasr City, Cairo, Egypt
| | - Nashwa Kamel
- Radiation Biology Department, National Centre for Radiation Research & Technology (NCRRT), Atomic Energy Authority, Nasr City, Cairo, Egypt
| | - Elbatoul Attia
- Radiation Biology Department, National Centre for Radiation Research & Technology (NCRRT), Atomic Energy Authority, Nasr City, Cairo, Egypt
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196
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The thermal impact of phototherapy with concurrent super-pulsed lasers and red and infrared LEDs on human skin. Lasers Med Sci 2015; 30:1575-81. [DOI: 10.1007/s10103-015-1755-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Accepted: 04/23/2015] [Indexed: 01/17/2023]
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197
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Emel'yanov AN, Kir'yanova VV. [The application of stem cells, visible and infrared light in regenerative medicine. Part 1]. VOPROSY KURORTOLOGII, FIZIOTERAPII, I LECHEBNOĬ FIZICHESKOĬ KULTURY 2015; 92:51-62. [PMID: 25876436 DOI: 10.17116/kurort2015151-62] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVE The present article was designed to overview the experimental studies of visible and infrared light irradiation of human and animal stem cells (SC) in vitro and in vivo for the evaluation of its photobiomodulatory effects. The results will be used to elaborate substantiation for the choice of the parameters of SC light irradiation and to develop recommendations for the application of this method in regenerative medicine (RM). BACKGROUND The clinical application of light irradiation is a matter of contrsy, in the first place due to the difficulties encountered in the rational choice of irradiation parameters. The theoretical substantiation of such choice remains a stumbling block too despite the long history of photoghromotherapy. There is thus far no reliable theoretical basis for the adequate choice of such irradiation parameters as power density, radiation dose, and exposure time. The experiences with the light application for the purpose of regenerative medicine have never been summarized. RESULTS The present review encompasses 78 articles selected for the basic analysis that report the studies with the use of a variety of SC types. The analysis has demonstrated that clinical investigations into the influence of light on the stem cells are still in their infancy. It was shown that the irradiation parameters need to be chosen taking into consideration the type of the stem cells. Different authors report the achievement of the maximum SC proliferation and differentiation rates at energy densities as high as 50 mW/sq.cm, small radiation doses (around 1 J/sq.cm) and exposure time (on the order of seconds). CONCLUSION The general conclusion for Parts 1 and II of this communication will be presented in the next issue of this journal (number 2, 2015).
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Affiliation(s)
- A N Emel'yanov
- GBOU VPO 'Severo-Zapadnyj gosudarstvennyj meditsinskij universitet im. I.I. Mechnikova' Minzdrava Rossii, ul. Kirochnaja, 41, Sankt-Peterburg, Rossijskaja Federatsija, 191015
| | - V V Kir'yanova
- GBOU VPO 'Severo-Zapadnyj gosudarstvennyj meditsinskij universitet im. I.I. Mechnikova' Minzdrava Rossii, ul. Kirochnaja, 41, Sankt-Peterburg, Rossijskaja Federatsija, 191015
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198
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Fukuzaki Y, Shin H, Kawai HD, Yamanoha B, Kogure S. 532 nm Low-Power Laser Irradiation Facilitates the Migration of GABAergic Neural Stem/Progenitor Cells in Mouse Neocortex. PLoS One 2015; 10:e0123833. [PMID: 25919297 PMCID: PMC4412395 DOI: 10.1371/journal.pone.0123833] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2014] [Accepted: 02/21/2015] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND AND OBJECTIVE Accumulating evidence has shown that low-power laser irradiation (LLI) affects cell proliferation and survival, but little is known about LLI effects on neural stem/progenitor cells (NSPCs). Here we investigate whether transcranial 532 nm LLI affects NSPCs in adult murine neocortex and in neurospheres from embryonic mice. STUDY DESIGN/MATERIALS AND METHODS We applied 532 nm LLI (Nd:YVO4, CW, 60 mW) on neocortical surface via cranium in adult mice and on cultured cells from embryonic mouse brains in vitro to investigate the proliferation and migration of NSPCs and Akt expression using immunohistochemical assays and Western blotting techniques. RESULTS In vivo experiments demonstrated that 532 nm LLI significantly facilitated the migration of GABAergic NSPCs that were induced to proliferate in layer 1 by mild ischemia. In vitro experiments using GABAergic NSPCs derived from embryonic day 14 ganglionic eminence demonstrated that 532 nm LLI for 60 min promoted the migration of GAD67-immunopositive NSPCs with a significant increase of Akt expression. Meanwhile, the LLI induced proliferation, but not migration, of NSPCs that give rise to excitatory neurons. CONCLUSION It is concluded that 532 nm LLI promoted the migration of GABAergic NSPCs into deeper layers of the neocortex in vivo by elevating Akt expression.
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Affiliation(s)
- Yumi Fukuzaki
- Department of Bioinformatics, Graduate School of Engineering, Soka University, Hachioji, Tokyo, Japan
| | - Hyeryun Shin
- Department of Bioinformatics, Graduate School of Engineering, Soka University, Hachioji, Tokyo, Japan
| | - Hideki D. Kawai
- Department of Bioinformatics, Graduate School of Engineering, Soka University, Hachioji, Tokyo, Japan
| | - Banri Yamanoha
- Department of Environmental Engineering for Symbiosis, Faculty of Engineering, Soka University, Hachioji, Tokyo, Japan
| | - Shinichi Kogure
- Department of Bioinformatics, Graduate School of Engineering, Soka University, Hachioji, Tokyo, Japan
- * E-mail:
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199
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Basso FG, Pansani TN, Soares DG, Scheffel DL, Bagnato VS, de Souza Costa CA, Hebling J. Biomodulation of Inflammatory Cytokines Related to Oral Mucositis by Low-Level Laser Therapy. Photochem Photobiol 2015; 91:952-6. [PMID: 25735212 DOI: 10.1111/php.12445] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Accepted: 02/24/2015] [Indexed: 11/28/2022]
Abstract
This study evaluated the effects of LLLT on the expression of inflammatory cytokines related to the development of oral mucositis by gingival fibroblasts. Primary gingival fibroblasts were seeded on 24-well plates (10(5) cells/well) for 24 h. Fresh serum-free culture medium (DMEM) was then added, and cells were placed in contact with LPS (Escherichia coli, 1 μg mL(-1)), followed by LLLT irradiation (LaserTABLE-InGaAsP diode prototype-780 nm, 25 mW) delivering 0, 0.5, 1.5 or 3 J cm(-2)². Cells without contact with LPS were also irradiated with the same energy densities. Gene expression of TNF-α, IL-1β, IL-6 and IL-8 was evaluated by Real-Time PCR, and protein synthesis of these cytokines was determined by enzyme-linked immunosorbent (ELISA) assay. Data were statistically analyzed by the Kruskal-Wallis test, complemented by the Mann-Whitney test (P < 0.05). LPS treatment increased the gene expression and protein synthesis of TNF-α, IL-6 and IL-8, while the expression of IL-1β was not affected. For LPS-treated groups, LLLT promoted significant decreases in the expression of TNF-α, IL-6, and IL-8 at 1.5 J cm(-2) and 3 J cm(-2). These results demonstrate that LLLT promoted a beneficial biomodulatory effect on the expression of inflammatory cytokines related to oral mucositis by human gingival fibroblasts.
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Affiliation(s)
- Fernanda G Basso
- Araraquara School of Dentistry, UNESP - Univ. Estadual Paulista, Araraquara, Brazil
| | - Taisa N Pansani
- Araraquara School of Dentistry, UNESP - Univ. Estadual Paulista, Araraquara, Brazil
| | - Diana G Soares
- Araraquara School of Dentistry, UNESP - Univ. Estadual Paulista, Araraquara, Brazil
| | - Débora L Scheffel
- Araraquara School of Dentistry, UNESP - Univ. Estadual Paulista, Araraquara, Brazil
| | | | | | - Josimeri Hebling
- Araraquara School of Dentistry, UNESP - Univ. Estadual Paulista, Araraquara, Brazil
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200
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Effect of low-level laser therapy on mesenchymal stem cell proliferation: a systematic review. Lasers Med Sci 2015; 30:2189-94. [DOI: 10.1007/s10103-015-1730-9] [Citation(s) in RCA: 338] [Impact Index Per Article: 37.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 02/22/2015] [Indexed: 10/23/2022]
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