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Dyshko V, Hilszczańska D, Davydenko K, Matić S, Moser WK, Borowik P, Oszako T. An Overview of Mycorrhiza in Pines: Research, Species, and Applications. PLANTS (BASEL, SWITZERLAND) 2024; 13:506. [PMID: 38498468 PMCID: PMC10891885 DOI: 10.3390/plants13040506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 02/04/2024] [Accepted: 02/07/2024] [Indexed: 03/20/2024]
Abstract
In the latest literature, climate models show that the conditions for pines, spruces, larches, and birches will deteriorate significantly. In Poland, as well as in other European countries, there are already signs of the decline of these species. This review article deals with the symbiotic relationships between fungi and plants, which can hardly be overestimated, using the example of pine trees. These are the oldest known symbiotic relationships, which are of great benefit to both components and can help plants, in particular, survive periods of severe drought and the attack of pathogens on the roots. This article describes symbioses and their causal conditions, as well as the mycorrhizal components of pine trees and their properties; characterizes ectomycorrhizal fungi and their mushroom-forming properties; and provides examples of the cultivation of pure fungal cultures, with particular attention to the specificity of the mycorrhizal structure and its effects on the growth and development of Pinus species. Finally, the role of mycorrhiza in plant protection and pathogen control is described.
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Affiliation(s)
- Valentyna Dyshko
- Ukrainian Research Institute of Forestry and Forest Melioration Named after G. M. Vysotsky, 61024 Kharkiv, Ukraine; (V.D.); (K.D.)
| | - Dorota Hilszczańska
- Department of Forest Ecology, Forest Research Institute, Sękocin Stary, Braci Leśnej 3, 05-090 Raszyn, Poland;
| | - Kateryna Davydenko
- Ukrainian Research Institute of Forestry and Forest Melioration Named after G. M. Vysotsky, 61024 Kharkiv, Ukraine; (V.D.); (K.D.)
- Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, Swedish University of Agricultural Sciences, P.O. Box 7026, 75007 Uppsala, Sweden
| | - Slavica Matić
- Institute for Sustainable Plant Protection (IPSP), National Research Council of Italy (CNR), Strada delle Cacce 73, 10135 Torino, Italy;
| | - W. Keith Moser
- US Department of Agriculture, Forest Service, Rocky Mountain Research Station, 2500 S. Pine Knoll Dr., Flagstaff, AZ 86001, USA;
| | - Piotr Borowik
- Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, Wiejska 45E, 15-351 Białystok, Poland;
| | - Tomasz Oszako
- Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, Wiejska 45E, 15-351 Białystok, Poland;
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Şen E, Özkan N, Önger ME, Kaplan S. Effects of NGF and Photobiomodulation Therapy on Crush Nerve Injury and Fracture Healing: A Stereological and Histopathological Study in an Animal Model. Craniomaxillofac Trauma Reconstr 2023; 16:281-291. [PMID: 38047151 PMCID: PMC10693267 DOI: 10.1177/19433875221138175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2023] Open
Abstract
Study Design A stereological and histopathological study in an animal model. Objective This study explores the effects of the nerve growth factor and photobiomodulation therapy on the damaged nerve tissue and fracture healing. Methods A total of 24 rabbits were divided into 4 groups: control group (n = 5), nerve growth factor (NGF) group (n = 7), photobiomodulation (PBMT) group (n = 6), and nerve growth factor and photobiomodulation therapy (NGF+PBMT) group (n = 6). The vertical fracture was performed between the mental foramen and the first premolar, and the mental nerve was crushed for 30 seconds with a standard serrated clamp with a force of approximately 50 N in all groups. The control group received an isotonic solution (.02 mL, .09% NaCl) to the operation site locally. The NGF group received 1 μg human NGF-β/.9% .2 mL NaCl solution for 7 days locally. The PBMT group received PBMT treatment (GaAlAs laser, 810 nm, .3 W, 18 J/cm2) every 48 hours for 14 sessions following the surgery. The NGF+PBMT group received both NGF and PBMT treatment as described above. After 28 days, the bone tissues and mental nerves from all groups were harvested and histologically and stereologically analyzed. Results According to the stereological results, the volume of the new vessel and the volume of the new bone were significantly higher in the PBMT group than in other groups (P < .001). According to the histopathological examinations, higher myelinated axons were observed in experimental groups than in the control group. Conclusions As a result, PBMT has beneficial effects on bone regeneration. Based on the light microscopic evaluation, more regenerated axon populations were observed in the NGF group than in the PBMT and PBMT + NGF groups in terms of myelinated axon content.
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Affiliation(s)
- Esengül Şen
- Assistant Professor, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ondokuz Mayıs University, Turkey
| | - Nilüfer Özkan
- Professor, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ondokuz Mayıs University, Turkey
| | - Mehmet Emin Önger
- Associate Professor, Department of Histology and Embryology, Faculty of Medicine, Ondokuz Mayis University, Turkey
| | - Süleyman Kaplan
- Professor, Department of Histology and Embryology, Faculty of Medicine, Ondokuz Mayis University, Turkey
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Polat B, Okur DT, Çolak A, Okur S, Özkaraca M, Yilmaz K. Comparison of three different dosages of low-level laser therapy on expression of cell proliferation and inflammatory markers following ovariohysterectomy in rats. Cutan Ocul Toxicol 2023; 42:273-282. [PMID: 37624142 DOI: 10.1080/15569527.2023.2252075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 08/16/2023] [Accepted: 08/21/2023] [Indexed: 08/26/2023]
Abstract
The objective of the current study was to evaluate Low-level laser therapy (LLLT) on the healing of incisional wounds following ovariohysterectomy in rats, by means of subjective histopathological and immunohistochemical analysis. A total of 72 female Wistar rats were categorised into four treatment groups (Group I; sacrification 4 hours following only one LLLT application, Group II; sacrification 7 days following only one LLLT application, Group III; sacrification 4 hours after two LLLT applications, and Group IV; sacrification 7 days after two LLLT applications). Each group was further divided into four different doses subgroups (Group Control [C, off mode LLLT application], L1 [1 J/cm2], L3 [3 J/cm2], and L6 [6 J/cm2]), with equal representation in each subgroup. Ovariohysterectomy was employed using two 2-cm-length midline abdominal incisions in the left and right sides of line alba. The Group C was assigned to the left side incision to each rat in the study. After irradiation, the tissue was subjected to histopathological analysis to determine the extent of mononuclear cell infiltration, edoema, and epithelialization. Additionally, immunohistochemical analysis was performed to evaluate the expression of proliferating cell nuclear antigen (pCNA) and inducible nitric oxide synthase (iNOS). Group L1 and L3 significantly decreased mononuclear cell infiltration compared with Group C in all treatment groups (p < 0.05). Group L3 significantly decreased edoema compared with Group C in all groups except for treatment Group I (p < 0.05). Group L2 and L3 significantly increased epithelization in treatment Group IV (p < 0.05). Moreover, Group L2 and L3 significantly increased pCNA in all groups, while L2 and L3 significantly decreased iNOS expression in treatment Group II, III, and IV (p < 0.05). However, no statistical difference was found between subgroups of treatment Group I in iNOS expiration (p > 0.05). The results of the current examination demonstrated that LLLT can modulate mononuclear cell infiltration and edoema, and improve epithelization, as well as increase pCNA expression, whereas decrease iNOS expression during the wound healing process, therefore enhancing wound healing following ovariohysterectomy in rats.
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Affiliation(s)
- Bülent Polat
- Department of Obstetrics and Gynecology, Atatürk University, Erzurum, Turkey
- Bil-Tek, Ata Teknokent, Erzurum, TR, Turkey
| | - Damla Tuğçe Okur
- Department of Obstetrics and Gynecology, Atatürk University, Erzurum, Turkey
| | - Armağan Çolak
- Department of Obstetrics and Gynecology, Atatürk University, Erzurum, Turkey
| | - Sıtkıcan Okur
- Department of Surgery, Atatürk University, Erzurum, Turkey
| | - Mustafa Özkaraca
- Department of Pathology, Sivas Cumhuriyet University, Sivas, Turkey
| | - Kader Yilmaz
- Celal Oruç Animal Production School, Ağrı İbrahim Çeçen University, Ağrı, Turkey
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Bikmulina P, Kosheleva N, Shpichka A, Yusupov V, Gogvadze V, Rochev Y, Timashev P. Photobiomodulation in 3D tissue engineering. JOURNAL OF BIOMEDICAL OPTICS 2022; 27:JBO-220027VRR. [PMID: 36104833 PMCID: PMC9473299 DOI: 10.1117/1.jbo.27.9.090901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 08/28/2022] [Indexed: 06/15/2023]
Abstract
SIGNIFICANCE The method of photobiomodulation (PBM) has been used in medicine for a long time to promote anti-inflammation and pain-resolving processes in different organs and tissues. PBM triggers numerous cellular pathways including stimulation of the mitochondrial respiratory chain, alteration of the cytoskeleton, cell death prevention, increasing proliferative activity, and directing cell differentiation. The most effective wavelengths for PBM are found within the optical window (750 to 1100 nm), in which light can permeate tissues and other water-containing structures to depths of up to a few cm. PBM already finds its applications in the developing fields of tissue engineering and regenerative medicine. However, the diversity of three-dimensional (3D) systems, irradiation sources, and protocols intricate the PBM applications. AIM We aim to discuss the PBM and 3D tissue engineered constructs to define the fields of interest for PBM applications in tissue engineering. APPROACH First, we provide a brief overview of PBM and the timeline of its development. Then, we discuss the optical properties of 3D cultivation systems and important points of light dosimetry. Finally, we analyze the cellular pathways induced by PBM and outcomes observed in various 3D tissue-engineered constructs: hydrogels, scaffolds, spheroids, cell sheets, bioprinted structures, and organoids. RESULTS Our summarized results demonstrate the great potential of PBM in the stimulation of the cell survival and viability in 3D conditions. The strategies to achieve different cell physiology states with particular PBM parameters are outlined. CONCLUSIONS PBM has already proved itself as a convenient and effective tool to prevent drastic cellular events in the stress conditions. Because of the poor viability of cells in scaffolds and the convenience of PBM devices, 3D tissue engineering is a perspective field for PBM applications.
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Affiliation(s)
- Polina Bikmulina
- Sechenov First Moscow State Medical University, World-Class Research Center “Digital Biodesign and Personalized Healthcare”, Moscow, Russia
| | - Nastasia Kosheleva
- Sechenov First Moscow State Medical University, Institute for Regenerative Medicine, Moscow, Russia
- FSBSI Institute of General Pathology and Pathophysiology, Moscow, Russia
- Sechenov University, Laboratory of Clinical Smart Nanotechnologies, Moscow, Russia
| | - Anastasia Shpichka
- Sechenov First Moscow State Medical University, Institute for Regenerative Medicine, Moscow, Russia
- Sechenov University, Laboratory of Clinical Smart Nanotechnologies, Moscow, Russia
| | - Vladimir Yusupov
- Institute of Photon Technologies of FSRC “Crystallography and Photonics” RAS, Troitsk, Russia
| | - Vladimir Gogvadze
- Lomonosov Moscow State University, Faculty of Medicine, Moscow, Russia
- Karolinska Institutet, Institute of Environmental Medicine, Division of Toxicology, Stockholm, Sweden
| | - Yury Rochev
- National University of Ireland, Galway, Galway, Ireland
| | - Peter Timashev
- Sechenov First Moscow State Medical University, Institute for Regenerative Medicine, Moscow, Russia
- Sechenov University, Laboratory of Clinical Smart Nanotechnologies, Moscow, Russia
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Pourshahidi S, Ebrahimi H, Abbasi Javan Z, Bahrami N. In Vitro Effect of 810 nm and 940 nm Diode Laser Irradiation on Proliferation of Human Gingival Fibroblasts and Expression of Procollagen Gene. Photochem Photobiol 2022; 98:1441-1446. [PMID: 35377467 DOI: 10.1111/php.13630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 03/31/2022] [Indexed: 11/29/2022]
Abstract
Factors promoting fibroblast proliferation and collagen synthesis can subsequently enhance wound healing. This study aimed to assess the effect of 810 and 940 nm diode laser on fibroblast proliferation and procollagen gene expression. In this study, human gingival fibroblasts were cultured in Dulbecco's modified Eagle's medium and underwent 810 and 940 nm diode laser irradiation once, twice, thrice and four times at 1, 3, 5 and 7 days after culture. The methyl thiazolyl tetrazolium assay was performed to assess the proliferation while the real-time polymerase chain reaction was performed to assess the expression of procollagen gene at the mRNA level. We applied Two-way ANOVA and Tukey's test for analysis. Wavelength had no significant effect on proliferation of gingival fibroblasts, but increasing the number of irradiation sessions of both wavelengths increased the proliferation of human gingival fibroblasts. Significant differences were noted in the number of human gingival fibroblasts between groups irradiated 1 and 4 and also 2 and 4 times. Procollagen gene was well expressed in all groups but its expression was significantly higher in 940 nm laser group after 4 irradiation cycles. 4 times radiation of 940 nm laser seems to be more effective than all others.
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Affiliation(s)
- Sara Pourshahidi
- Oral and Maxillofacial Medicine Department, Tehran University of Medical Sciences, Tehran, Iran
| | - Hooman Ebrahimi
- Oral Medicine Department, Dental Faculty, Azad University of Medical Sciences, Tehran, Iran
| | - Zahra Abbasi Javan
- Post Graduate Student, Hamedan University of Medical Sciences, Hamedan, Iran
| | - Naghmeh Bahrami
- Department of Tissue engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
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Laser Light Treatment Improves the Mineral Composition, Essential Oil Production and Antimicrobial Activity of Mycorrhizal Treated Pelargoniumgraveolens. Molecules 2022; 27:molecules27061752. [PMID: 35335116 PMCID: PMC8954123 DOI: 10.3390/molecules27061752] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/14/2022] [Accepted: 02/22/2022] [Indexed: 11/20/2022] Open
Abstract
Pelargonium graveolens, rose-scented geranium, is commonly used in the perfume industry. P. graveolens is enriched with essential oils, phenolics, flavonoids, which account for its tremendous biological activities. Laser light treatment and arbuscular mycorrhizal fungi (AMF) inoculation can further enhance the phytochemical content in a significant manner. In this study, we aimed to explore the synergistic impact of these two factors on P. graveolens. For this, we used four groups of surface-sterilized seeds: (1) control group1 (non-irradiated; non-colonized group); (2) control group2 (mycorrhizal colonized group); (3) helium-neon (He-Ne) laser-irradiated group; (4) mycorrhizal colonization coupled with He-Ne laser-irradiation group. Treated seeds were growing in artificial soil inculcated with Rhizophagus irregularis MUCL 41833, in a climate-controlled chamber. After 6 weeks, P. graveolens plants were checked for their phytochemical content and antibacterial potential. Laser light application improved the mycorrhizal colonization in P. graveolens plants which subsequently increased biomass accumulation, minerals uptake, and biological value of P. graveolens. The increase in the biological value was evident by the increase in the essential oils production. The concomitant application of laser light and mycorrhizal colonization also boosted the antimicrobial activity of P. graveolens. These results suggest that AMF co-treatment with laser light could be used as a promising approach to enhance the metabolic content and yield of P. graveolens for industrial and pharmaceutical use.
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Potassium iodide enhances inactivation of Streptococcus mutans biofilm in antimicrobial photodynamic therapy with red laser. Photodiagnosis Photodyn Ther 2021; 37:102622. [PMID: 34775066 DOI: 10.1016/j.pdpdt.2021.102622] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 10/25/2021] [Accepted: 11/08/2021] [Indexed: 11/22/2022]
Abstract
OBJECTIVE To evaluate the effect of potassium iodide (KI) addition on antimicrobial photodynamic therapy (aPDT) mediated by red laser (λ = 660 nm) and methylene blue in Streptococcus mutans biofilm model. METHODS S. mutans biofilms were cultured in 96-well plates containing BHI broth with 1% sucrose for 18 h, 10% CO2 and 37°C and divided in groups (n = 3, in triplicate): C (NaCl 0.9%); CX (0.2% chlorhexidine); P (photosensitizer); KI (10, 25 and 50 mM); PKI (10, 25 and 50 mM); L (L 1: : 100 J/cm2, 9 J; L2: 200 J/cm2, 18 J); PL (photosensitizer + L1 or L2); KIL (KI at 10, 25 and 50 mM + L1 or L2); and PKIL (photosensitizer + 10, 25 and 50 mM KI + L1 or L2). Biofilms were submitted to three pre-irradiation (PI) times (5, 10, and 15 min). After the treatments, microbial counting's reduction was analyzed by Kruskal-Wallis and post-hoc Dunn's tests, respectively, and the interaction between light parameters and the PI times by two-way ANOVA (p < 0.05). RESULTS The S. mutans viability significantly reduced in all aPDT groups, in the presence or absence of KI (p < 0.05). For all PI times, PKIL groups (10, 25, and 50 mM) significantly differed from PL groups (p < 0.05) with a reduction of 9.0 logs reached at 50 mM of KI with 15 min of PI, irradiated at 18 J. We found no significant interaction between PI time and irradiation (p > 0.05). CONCLUSION Addition KI to TFDA mediated by methylene blue and red laser promoted an additional effect in reducing the microbial viability of S. mutans biofilm.
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Zaccara IM, Mestieri LB, Pilar EFS, Moreira MS, Grecca FS, Martins MD, Kopper PMP. Photobiomodulation therapy improves human dental pulp stem cell viability and migration in vitro associated to upregulation of histone acetylation. Lasers Med Sci 2020; 35:741-749. [PMID: 32095920 DOI: 10.1007/s10103-019-02931-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 11/27/2019] [Indexed: 12/17/2022]
Abstract
This in vitro study evaluated the role of photobiomodulation therapy (PBMT) on viability and migration of human dental pulp stem cells (hDPSCs) and its association to epigenetic mechanisms such as histone acetylation. The hDPSCs were characterized and assigned into control and PBMT groups. For the PBMT, five laser irradiations at 6-h intervals were performed using a continuous-wave InGaAlP diode laser. Viability (MTT), migration (scratch), and histone acetylation H3 (H3K9ac immunofluorescence) were evaluated immediately after the last irradiation. PBMT significantly increased the viability (P = 0.004). Also, PBMT group showed significantly increased migration of cells in the wound compared to the control in 6 h (P = 0.002), 12 h (P = 0.014) and 18 h (P = 0.083) being faster than the control, which only finished the process at 24 h. PBMT induced epigenetic modifications in hDPSC due to increased histone acetylation (P = 0.001). PBMT increased viability and migration of hDPSCs, which are related with the upregulation of histone acetylation and could be considered a promising adjuvant therapy for regenerative endodontic treatment.
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Affiliation(s)
- Ivana M Zaccara
- Dentistry Graduate Program, Department of Conservative Dentistry, School of Dentistry, Federal University of Rio Grande do Sul - UFRGS, Rua Ramiro Barcelos, 2492, Porto Alegre, Rio Grande do Sul, 90035-003, Brazil
| | - Letícia B Mestieri
- Dentistry Graduate Program, Department of Conservative Dentistry, School of Dentistry, Federal University of Rio Grande do Sul - UFRGS, Rua Ramiro Barcelos, 2492, Porto Alegre, Rio Grande do Sul, 90035-003, Brazil
| | - Emily F S Pilar
- Department of Experimental Pathology, Clinics Hospital of Porto Alegre, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre, Rio Grande do Sul, Brazil
| | - Maria S Moreira
- Department of Dentistry, School of Dentistry, University of Sao Paulo, Sao Paulo, Brazil.,Ibirapuera University, Sao Paulo, Brazil
| | - Fabiana S Grecca
- Dentistry Graduate Program, Department of Conservative Dentistry, School of Dentistry, Federal University of Rio Grande do Sul - UFRGS, Rua Ramiro Barcelos, 2492, Porto Alegre, Rio Grande do Sul, 90035-003, Brazil
| | - Manoela D Martins
- Dentistry Graduate Program, Department of Conservative Dentistry, School of Dentistry, Federal University of Rio Grande do Sul - UFRGS, Rua Ramiro Barcelos, 2492, Porto Alegre, Rio Grande do Sul, 90035-003, Brazil
| | - Patrícia Maria Poli Kopper
- Dentistry Graduate Program, Department of Conservative Dentistry, School of Dentistry, Federal University of Rio Grande do Sul - UFRGS, Rua Ramiro Barcelos, 2492, Porto Alegre, Rio Grande do Sul, 90035-003, Brazil.
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Bora K, Kumar B, Prakash S, Rathi A. Dose-dependent study of effects of 532-nm continuous wave laser on rat skin: A mechanistic insight. JOURNAL OF BIOPHOTONICS 2019; 12:e201800484. [PMID: 31095896 DOI: 10.1002/jbio.201800484] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Revised: 05/12/2019] [Accepted: 05/15/2019] [Indexed: 06/09/2023]
Abstract
Visible lasers emitting in the green spectral region are being routinely employed in various medical and defense fields namely treatment of pigmented lesions, tattoo inks, port wine stains, dazzling the target or mob dispersal. Despite their increasing applications, lasers also tend to pose occupational hazards to operators, ancillary personnel, individuals undergoing laser therapies. This study was aimed at investigating the effects of different doses of 532-nm continuous wave laser on rat skin. The present study demonstrated that higher fluences of 532-nm continuous wave (CW) laser induces significant tissue damage through induction of tumor necrosis factor-α, cyclooxygenase-2, tumor protein (p53), PARP 1, caspase3 which in turn leads to tissue damage and cell death. Furthermore, level of heat shock proteins, pAkt were found up-regulated as a cope up response to laser-induced stress. On the basis of the findings, irradiation with 532-nm CW laser up to 2.5 J/cm2 was found within the safe exposure limits. Thus, it is probably the first attempt to demonstrate the tissue damage induced by 532-nm CW laser on skin, which may help in choosing safe laser dose for certain skin-based applications and evolving methods to ameliorate laser-inflicted injuries.
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Affiliation(s)
- Kiran Bora
- Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India
| | - Bhuvnesh Kumar
- Defence Institute of Physiology and Allied Sciences (DIPAS), DRDO, Delhi, India
| | - Satya Prakash
- Laser Science and Technology Centre (LASTEC), DRDO, Delhi, India
| | - Ajay Rathi
- Laser Science and Technology Centre (LASTEC), DRDO, Delhi, India
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Garrido P, Pedroni A, Cury D, Moreira M, Rosin F, Sarra G, Marques M. Effects of photobiomodulation therapy on the extracellular matrix of human dental pulp cell sheets. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2019; 194:149-157. [DOI: 10.1016/j.jphotobiol.2019.03.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 12/19/2018] [Accepted: 03/25/2019] [Indexed: 12/11/2022]
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Deumer J, Frentzen M, Meinke M. Investigation of active matrix- metaloproteinase-8 (aMMP-8) as a reference parameter for path control in antimicrobial photothermal therapy (aPTT) using a split-mouth design. Heliyon 2019; 5:e01661. [PMID: 31193352 PMCID: PMC6526226 DOI: 10.1016/j.heliyon.2019.e01661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 01/25/2019] [Accepted: 05/01/2019] [Indexed: 12/26/2022] Open
Abstract
OBJECTIVES This retrospective data-collection study aims to explain how the active matrix-metalloproteinase-8-titer (aMMP-titer) influences the immune response of the subject. This is done through monotherapy scaling and root planing (SRP) which is then compared to SRP combined with antimicrobial photothermal therapy (aPTT, Emundo®). METHODS Data collection was monocentric, randomized and split-mouth based. A study group of twenty patients with chronic periodontal disease with a periodontal pocket depth (PPD) 4 mm ≤ PPD ≤8 mm, a periodontal screening index (PSI: > 3), and a gingival recession ≤2 mm were selected.A diode laser, manufactured by A.R.C. Laser GmbH, with 810 nm wavelength was used. This device implemented three different light transmission systems for transgingival and intra-gingival irradiation. Power settings between 200 and 300 mW were deployed for 10 s during all treatment steps. The photothermic dye of EmunDo® system (A.R.C. Laser GmbH) was infracyaningreen.The adjuvant effect of the antimicrobial photothermal therapy (aPTT) with EmunDo® in combination with conventional SRP on the teeth 15 and 35 was compared with the results of monotherapy SRP on teeth 25 and 45. RESULTS A reduction of the aMMP-8-titer in gingival crevicular fluid (GCF) was observed in both groups (follow up group and control group) after one month. However; the decrease in the follow up group under SRP in combination with aPTT was significantly more pronounced. The periodontal pocket depths was reduced in both treatment groups. The periodontal probing depth (in mm) shows a larger decrease of the periodontal pocket depth within the follow up group (SPR with aPTT) compared with the control group (SRP). CONCLUSION The aMMP-8-titer showed differences in both groups prior to and after treatment. Active matrix-metalloproteinase-8 (aMMP-8) as a reference parameter for path control in antimicrobial photothermal therapy (aPTT) seems acceptable.
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Affiliation(s)
- J. Deumer
- MVZ Erstes Zahnärztliches Lasercentrum Berlin, Gatower Straße 296, 14089 Berlin, Germany
| | - M. Frentzen
- Department of Operative and Preventive Dentistry, Bonn University, Dental Faculty, Germany
| | - M.C. Meinke
- Department of Dermatology, Venereology and Allergology, Charité University Medicine Berlin Campus Charité Mitte, Germany
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Michelogiannakis D, Al-Shammery D, Akram Z, Rossouw PE, Javed F, Romanos GE. Influence of low-level laser therapy on orthodontically-induced inflammatory root resorption. A systematic review. Arch Oral Biol 2019; 100:1-13. [DOI: 10.1016/j.archoralbio.2019.01.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 01/11/2019] [Accepted: 01/28/2019] [Indexed: 12/12/2022]
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Yeste M, Castillo-Martín M, Bonet S, Rodríguez-Gil JE. Impact of light irradiation on preservation and function of mammalian spermatozoa. Anim Reprod Sci 2018; 194:19-32. [DOI: 10.1016/j.anireprosci.2018.02.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 02/03/2018] [Accepted: 02/06/2018] [Indexed: 01/04/2023]
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James A, Berkowitz SA, Ashburner JM, Chang Y, Horn DM, O'Keefe SM, Atlas SJ. Impact of a Population Health Management Intervention on Disparities in Cardiovascular Disease Control. J Gen Intern Med 2018; 33:463-470. [PMID: 29313223 PMCID: PMC5880754 DOI: 10.1007/s11606-017-4227-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 09/07/2017] [Accepted: 10/26/2017] [Indexed: 12/21/2022]
Abstract
BACKGROUND Healthcare systems use population health management programs to improve the quality of cardiovascular disease care. Adding a dedicated population health coordinator (PHC) who identifies and reaches out to patients not meeting cardiovascular care goals to these programs may help reduce disparities in cardiovascular care. OBJECTIVE To determine whether a program that used PHCs decreased racial/ethnic disparities in LDL cholesterol and blood pressure (BP) control. DESIGN Retrospective difference-in-difference analysis. PARTICIPANTS Twelve thousdand five hundred fifty-five primary care patients with cardiovascular disease (cohort for LDL analysis) and 41,183 with hypertension (cohort for BP analysis). INTERVENTION From July 1, 2014-December 31, 2014, 18 practices used an information technology (IT) system to identify patients not meeting LDL and BP goals; 8 practices also received a PHC. We examined whether having the PHC plus IT system, compared with having the IT system alone, decreased racial/ethnic disparities, using difference-in-difference analysis of data collected before and after program implementation. MAIN MEASURES Meeting guideline concordant LDL and BP goals. KEY RESULTS At baseline, there were racial/ethnic disparities in meeting LDL (p = 0.007) and BP (p = 0.0003) goals. Comparing practices with and without a PHC, and accounting for pre-intervention LDL control, non-Hispanic white patients in PHC practices had improved odds of LDL control (OR 1.20 95% CI 1.09-1.32) compared with those in non-PHC practices. Non-Hispanic black (OR 1.15 95% CI 0.80-1.65) and Hispanic (OR 1.29 95% CI 0.66-2.53) patients saw similar, but non-significant, improvements in LDL control. For BP control, non-Hispanic white patients in PHC practices (versus non-PHC) improved (OR 1.13 95% CI 1.05-1.22). Non-Hispanic black patients (OR 1.17 95% CI 0.94-1.45) saw similar, but non-statistically significant, improvements in BP control, but Hispanic (OR 0.90 95% CI 0.59-1.36) patients did not. Interaction testing confirmed that disparities did not decrease (p = 0.73 for LDL and p = 0.69 for BP). CONCLUSIONS The population health management intervention did not decrease disparities. Further efforts should explicitly target improving both healthcare equity and quality. Clinical Trials #: NCT02812303 ( ClinicalTrials.gov ).
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Affiliation(s)
- Aisha James
- Harvard/Massachusetts General Hospital Medicine-Pediatrics Residency Program, Boston, MA, USA
| | - Seth A Berkowitz
- Division of General Internal Medicine, Massachusetts General Hospital, Boston, MA, USA.
- Harvard Medical School, Boston, MA, USA.
| | - Jeffrey M Ashburner
- Division of General Internal Medicine, Massachusetts General Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - Yuchiao Chang
- Division of General Internal Medicine, Massachusetts General Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
| | - Daniel M Horn
- Division of General Internal Medicine, Massachusetts General Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
- Massachusetts General Physicians Organization, Massachusetts General Hospital, Boston, MA, USA
| | - Sandra M O'Keefe
- Massachusetts General Physicians Organization, Massachusetts General Hospital, Boston, MA, USA
| | - Steven J Atlas
- Division of General Internal Medicine, Massachusetts General Hospital, Boston, MA, USA
- Harvard Medical School, Boston, MA, USA
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15
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Low level laser therapy accelerates the extracellular matrix reorganization of inflamed tendon. Tissue Cell 2017; 49:483-488. [DOI: 10.1016/j.tice.2017.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 05/22/2017] [Accepted: 05/23/2017] [Indexed: 11/18/2022]
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Tiwari JN, Seo YK, Yoon T, Lee WG, Cho WJ, Yousuf M, Harzandi AM, Kang DS, Kim KY, Suh PG, Kim KS. Accelerated Bone Regeneration by Two-Photon Photoactivated Carbon Nitride Nanosheets. ACS NANO 2017; 11:742-751. [PMID: 28033461 DOI: 10.1021/acsnano.6b07138] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Human bone marrow-derived mesenchymal stem cells (hBMSCs) present promising opportunities for therapeutic medicine. Carbon derivatives showed only marginal enhancement in stem cell differentiation toward bone formation. Here we report that red-light absorbing carbon nitride (C3N4) sheets lead to remarkable proliferation and osteogenic differentiation by runt-related transcription factor 2 (Runx2) activation, a key transcription factor associated with osteoblast differentiation. Accordingly, highly effective hBMSCs-driven mice bone regeneration under red light is achieved (91% recovery after 4 weeks compared to 36% recovery in the standard control group in phosphate-buffered saline without red light). This fast bone regeneration is attributed to the deep penetration strength of red light into cellular membranes via tissue and the resulting efficient cell stimulation by enhanced photocurrent upon two-photon excitation of C3N4 sheets near cells. Given that the photoinduced charge transfer can increase cytosolic Ca2+ accumulation, this increase would promote nucleotide synthesis and cellular proliferation/differentiation. The cell stimulation enhances hBMSC differentiation toward bone formation, demonstrating the therapeutic potential of near-infrared two-photon absorption of C3N4 sheets in bone regeneration and fracture healing.
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Affiliation(s)
- Jitendra N Tiwari
- Department of Chemistry and §School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Ulsan 44919, Korea
| | - Young-Kyo Seo
- Department of Chemistry and §School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Ulsan 44919, Korea
| | - Taeseung Yoon
- Department of Chemistry and §School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Ulsan 44919, Korea
| | - Wang Geun Lee
- Department of Chemistry and §School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Ulsan 44919, Korea
| | - Woo Jong Cho
- Department of Chemistry and §School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Ulsan 44919, Korea
| | - Muhammad Yousuf
- Department of Chemistry and §School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Ulsan 44919, Korea
| | - Ahmad M Harzandi
- Department of Chemistry and §School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Ulsan 44919, Korea
| | - Du-Seok Kang
- Department of Chemistry and §School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Ulsan 44919, Korea
| | - Kwang-Youn Kim
- Department of Chemistry and §School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Ulsan 44919, Korea
| | - Pann-Ghill Suh
- Department of Chemistry and §School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Ulsan 44919, Korea
| | - Kwang S Kim
- Department of Chemistry and §School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil, Ulsan 44919, Korea
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Park JS, Park KH. Light enhanced bone regeneration in an athymic nude mouse implanted with mesenchymal stem cells embedded in PLGA microspheres. Biomater Res 2016; 20:4. [PMID: 26893909 PMCID: PMC4758155 DOI: 10.1186/s40824-016-0051-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 01/05/2016] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Biodegradable microspheres fabricated from poly (Lactic-co-glycolic acid) (PLGA) have attracted considerable attention in the bone tissue regeneration field. In this study, rabbit mesenchymal stem cells (rMSCs) adherent to PLGA microspheres were implanted into athymic nude mice and irradiated with 647 nm red light to promote bone formation. It was found that irradiating rMSCs with high levels of red light (647 nm) from an LED (light-emitting diode) increased levels of bone specific markers in rMSCs embedded on PLGA microspheres. RESULT These increased expressions were observed by RT-PCR, real time-QPCR, immunohistochemistry (IHC), and von Kossa and Alizarin red S staining. Microsphere matrices coated with rMSCs were injected into athymic nude mice and irradiated with red light for 60 seconds showed significantly greater bone-specific phenotypes after 4 weeks in vivo. CONCLUSION The devised PLGA microsphere matrix containing rMSCs and irradiation with red light at 647 nm process shows promise as a means of coating implantable biomedical devices to improve their biocompatibilities and in vivo performances.
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Affiliation(s)
- Ji Sun Park
- Department of Biomedical Science, College of Life Science, CHA University, 6F, CHA bio-complex, 689 Sampyeong-Dong, Bundang-Gu, Seongnam-Si Republic of Korea
| | - Keun-Hong Park
- Department of Biomedical Science, College of Life Science, CHA University, 6F, CHA bio-complex, 689 Sampyeong-Dong, Bundang-Gu, Seongnam-Si Republic of Korea
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18
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Yu Z, Liu N, Zhao J, Li Y, McCarthy TJ, Tedford CE, Lo EH, Wang X. Near infrared radiation rescues mitochondrial dysfunction in cortical neurons after oxygen-glucose deprivation. Metab Brain Dis 2015; 30:491-6. [PMID: 24599760 PMCID: PMC4156924 DOI: 10.1007/s11011-014-9515-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Accepted: 02/20/2014] [Indexed: 11/25/2022]
Abstract
Near infrared radiation (NIR) is known to penetrate and affect biological systems in multiple ways. Recently, a series of experimental studies suggested that low intensity NIR may protect neuronal cells against a wide range of insults that mimic diseases such as stroke, brain trauma and neurodegeneration. However, the potential molecular mechanisms of neuroprotection with NIR remain poorly defined. In this study, we tested the hypothesis that low intensity NIR may attenuate hypoxia/ischemia-induced mitochondrial dysfunction in neurons. Primary cortical mouse neuronal cultures were subjected to 4 h oxygen-glucose deprivation followed by reoxygenation for 2 h, neurons were then treated with a 2 min exposure to 810-nm NIR. Mitochondrial function markers including MTT reduction and mitochondria membrane potential were measured at 2 h after treatment. Neurotoxicity was quantified 20 h later. Our results showed that 4 h oxygen-glucose deprivation plus 20 h reoxygenation caused 33.8 ± 3.4 % of neuron death, while NIR exposure significantly reduced neuronal death to 23.6 ± 2.9 %. MTT reduction rate was reduced to 75.9 ± 2.7 % by oxygen-glucose deprivation compared to normoxic controls, but NIR exposure significantly rescued MTT reduction to 87.6 ± 4.5 %. Furthermore, after oxygen-glucose deprivation, mitochondria membrane potential was reduced to 48.9 ± 4.39 % of normoxic control, while NIR exposure significantly ameliorated this reduction to 89.6 ± 13.9 % of normoxic control. Finally, NIR significantly rescued OGD-induced ATP production decline at 20 min after NIR. These findings suggest that low intensity NIR can protect neurons against oxygen-glucose deprivation by rescuing mitochondrial function and restoring neuronal energetics.
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Affiliation(s)
- Zhanyang Yu
- Departments of Neurology and Radiology, Neuroprotection Research Laboratory, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, 02129, USA,
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Laser phototherapy enhances mesenchymal stem cells survival in response to the dental adhesives. ScientificWorldJournal 2015; 2015:671789. [PMID: 25879065 PMCID: PMC4386606 DOI: 10.1155/2015/671789] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 09/03/2014] [Indexed: 01/27/2023] Open
Abstract
Background. We investigated the influence of laser phototherapy (LPT) on the survival of human mesenchymal stem cells (MSCs) submitted to substances leached from dental adhesives. Method. MSCs were isolated and characterized. Oral mucosa fibroblasts and osteoblast-like cells were used as comparative controls. Cultured medium conditioned with two adhesive systems was applied to the cultures. Cell monolayers were exposed or not to LPT. Laser irradiations were performed using a red laser (GaAlAs, 780 nm, 0.04 cm2, 40 mW, 1 W/cm2, 0.4 J, 10 seconds, 1 point, 10 J/cm2). After 24 h, cell viability was assessed by the 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide reduction assay. Data were statistically compared by ANOVA followed by Tukey's test (P < 0.05). Results. Different cell types showed different viabilities in response to the same materials. Substances leached from adhesives were less cytotoxic to MSCs than to other cell types. Substances leached from Clearfil SE Bond were highly cytotoxic to all cell types tested, except to the MSCs when applied polymerized and in association with LPT. LPT was unable to significantly increase the cell viability of fibroblasts and osteoblast-like cells submitted to the dental adhesives. Conclusion. LPT enhances mesenchymal stem cells survival in response to substances leached from dental adhesives.
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Débarre D, Olivier N, Supatto W, Beaurepaire E. Mitigating phototoxicity during multiphoton microscopy of live Drosophila embryos in the 1.0-1.2 µm wavelength range. PLoS One 2014; 9:e104250. [PMID: 25111506 PMCID: PMC4128758 DOI: 10.1371/journal.pone.0104250] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 07/09/2014] [Indexed: 11/18/2022] Open
Abstract
Light-induced toxicity is a fundamental bottleneck in microscopic imaging of live embryos. In this article, after a review of photodamage mechanisms in cells and tissues, we assess photo-perturbation under illumination conditions relevant for point-scanning multiphoton imaging of live Drosophila embryos. We use third-harmonic generation (THG) imaging of developmental processes in embryos excited by pulsed near-infrared light in the 1.0-1.2 µm range. We study the influence of imaging rate, wavelength, and pulse duration on the short-term and long-term perturbation of development and define criteria for safe imaging. We show that under illumination conditions typical for multiphoton imaging, photodamage in this system arises through 2- and/or 3-photon absorption processes and in a cumulative manner. Based on this analysis, we derive general guidelines for improving the signal-to-damage ratio in two-photon (2PEF/SHG) or THG imaging by adjusting the pulse duration and/or the imaging rate. Finally, we report label-free time-lapse 3D THG imaging of gastrulating Drosophila embryos with sampling appropriate for the visualisation of morphogenetic movements in wild-type and mutant embryos, and long-term multiharmonic (THG-SHG) imaging of development until hatching.
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Affiliation(s)
- Delphine Débarre
- Laboratory for Optics and Biosciences, Ecole Polytechnique, CNRS UMR 7645, and INSERM U696, Palaiseau, France
- Univ. Grenoble Alpes, LIPhy, Grenoble, France
- CNRS, LIPhy, Grenoble, France
| | - Nicolas Olivier
- Laboratory for Optics and Biosciences, Ecole Polytechnique, CNRS UMR 7645, and INSERM U696, Palaiseau, France
| | - Willy Supatto
- Laboratory for Optics and Biosciences, Ecole Polytechnique, CNRS UMR 7645, and INSERM U696, Palaiseau, France
| | - Emmanuel Beaurepaire
- Laboratory for Optics and Biosciences, Ecole Polytechnique, CNRS UMR 7645, and INSERM U696, Palaiseau, France
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Pinfildi CE, da Silva ÉPR, Folha RA, Turchetto PC, Monteiro PPKP, Antunes A, Hochman BS. Mast Cell Curve-Response in Partial Achilles Tendon Rupture After 830 nm Phototherapy. Photomed Laser Surg 2014; 32:88-92. [DOI: 10.1089/pho.2013.3638] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Affiliation(s)
- Carlos E. Pinfildi
- Department of Human Movement Science, University Federal of São Paulo – UNIFESP – Campus Baixada Santista, Santos, SP, Brazil
| | | | - Roberta A.C. Folha
- Department of Surgery, University Federal of São Paulo – UNIFESP, São Paulo, SP, Brazil
| | - Paola C.G. Turchetto
- Department of Human Movement Science, University Federal of São Paulo – UNIFESP – Campus Baixada Santista, Santos, SP, Brazil
| | - Paola PKP Monteiro
- Department of Human Movement Science, University Federal of São Paulo – UNIFESP – Campus Baixada Santista, Santos, SP, Brazil
| | - Arainy Antunes
- Department of Surgery, University Federal of São Paulo – UNIFESP, São Paulo, SP, Brazil
| | - Bernardo S. Hochman
- Department of Surgery, University Federal of São Paulo – UNIFESP, São Paulo, SP, Brazil
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Huang YY, Nagata K, Tedford CE, McCarthy T, Hamblin MR. Low-level laser therapy (LLLT) reduces oxidative stress in primary cortical neurons in vitro. JOURNAL OF BIOPHOTONICS 2013; 6:829-38. [PMID: 23281261 PMCID: PMC3651776 DOI: 10.1002/jbio.201200157] [Citation(s) in RCA: 214] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Revised: 11/13/2012] [Accepted: 11/26/2012] [Indexed: 05/18/2023]
Abstract
Low-level laser (light) therapy (LLLT) involves absorption of photons being in the mitochondria of cells leading to improvement in electron transport, increased mitochondrial membrane potential (MMP), and greater ATP production. Low levels of reactive oxygen species (ROS) are produced by LLLT in normal cells that are beneficial. We exposed primary cultured murine cortical neurons to oxidative stressors: hydrogen peroxide, cobalt chloride and rotenone in the presence or absence of LLLT (3 J/cm², CW, 810 nm wavelength laser, 20 mW/cm²). Cell viability was determined by Prestoblue™ assay. ROS in mitochondria was detected using Mito-sox, while ROS in cytoplasm was detected with CellRox™. MMP was measured with tetramethylrhodamine. In normal neurons LLLT elevated MMP and increased ROS. In oxidatively-stressed cells LLLT increased MMP but reduced high ROS levels and protected cultured cortical neurons from death. Although LLLT increases ROS in normal neurons, it reduces ROS in oxidatively-stressed neurons. In both cases MMP is increased. These data may explain how LLLT can reduce clinical oxidative stress in various lesions while increasing ROS in cells in vitro.
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Affiliation(s)
- Ying-Ying Huang
- Wellman Center for Photomedicine, Massachusetts General Hospital, 40 Blossom Street, Boston MA 02114, USA
- Department of Dermatology, Harvard Medical School, Boston MA, USA
- Department of Pathology, Guangxi Medical University, Nanning, Guangxi, China
| | - Kazuya Nagata
- Wellman Center for Photomedicine, Massachusetts General Hospital, 40 Blossom Street, Boston MA 02114, USA
- Graduate School of Medicine, University of Tokyo, Japan
| | | | | | - Michael R. Hamblin
- Wellman Center for Photomedicine, Massachusetts General Hospital, 40 Blossom Street, Boston MA 02114, USA
- Department of Dermatology, Harvard Medical School, Boston MA, USA
- Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, USA
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Elnaghy AM, Murray PE, Bradley P, Marchesan M, Namerow KN, Badr AE, El-Hawary YM, Badria FA. Effects of low intensity laser irradiation phototherapy on dental pulp constructs. World J Stomatol 2013; 2:12-17. [DOI: 10.5321/wjs.v2.i1.12] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2012] [Revised: 12/25/2012] [Accepted: 01/21/2013] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate low intensity laser irradiation phototherapy (LILIP) on the proliferation, mineralization and degradation of dental pulp constructs.
METHODS: Stem cells from human exfoliated deciduous teeth (SHED) were grown to confluence and seeded on collagen scaffolds to create dental pulp constructs. LILIP was delivered to the dental pulp constructs using an 830 nm GaAIAs laser at an output power of 20 mW. The LILIP energy density was 0.4, 0.8, 1.2, and 2.4 J/cm2. After 8 d, the cell proliferation and degradation within the dental pulp constructs were measured using histologic criteria. After 28 d, the effect of LILIP on SHED mineralization was assessed by von Kossa staining.
RESULTS: SHED proliferation within the dental pulp constructs varied after exposure to the 0.4, 0.8, 1.2, and 2.4 J/cm2 LILIP energy densities (P < 0.05). The maximum proliferation of SHED in nutrient deficient media was 218% after exposure to a 1.2 J/cm2 LILIP energy density. SHED grown in nutrient deficient media after exposure to a 0.4, 0.8, and 1.2 J/cm2 LILIP energy density, proliferated by 167-218% compared to the untreated (non-LILIP) control group (P < 0.05). SHED exposed to a 0.4, 0.8, and 1.2 J/cm2 LILIP energy density, and grown in optimal nutritional conditions and proliferated by 147%-164% compared to the untreated (non-LILIP) control group (P < 0.05). The exposure of SHED to the highest LILIP energy density (2.4 J/cm2) caused a reduction of the cell proliferation of up to 73% of the untreated (non-LILIP) control (P < 0.05). The amount of mineral produced by SHED increased over time up to 28 d (P < 0.05). The 0.8 and 1.2 J/cm2 LILIP energy densities were the most effective at stimulating the increased the mineralization of the SHED from 150%-700% compared to untreated (non-LILIP) control over 28 d (P < 0.05). The degradation of dental pulp constructs was affected by LILIP (P < 0.05). The dental pulp constructs grown in optimal nutritional conditions exposed to a 0.8 J/cm2 or 1.2 J/cm2 LILIP energy density had 13% to 16% more degradation than the untreated (non-LILIP) control groups (P < 0.05). The other LILIP energy densities caused a 1% degradation of dental pulp constructs in optimal nutritional conditions (P > 0.05).
CONCLUSION: LILIP can enhance or reduce SHED proliferation, degradation and mineralization within dental pulp constructs. LILIP could promote the healing and regeneration of dental tissues.
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Jin G, Prabhakaran MP, Kai D, Kotaki M, Ramakrishna S. Electrospun photosensitive nanofibers: potential for photocurrent therapy in skin regeneration. Photochem Photobiol Sci 2013; 12:124-34. [DOI: 10.1039/c2pp25070e] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Anwer AG, Gosnell ME, Perinchery SM, Inglis DW, Goldys EM. Visible 532 nm laser irradiation of human adipose tissue-derived stem cells: effect on proliferation rates, mitochondria membrane potential and autofluorescence. Lasers Surg Med 2012; 44:769-78. [PMID: 23047589 DOI: 10.1002/lsm.22083] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/14/2012] [Indexed: 12/30/2022]
Abstract
BACKGROUND AND OBJECTIVE The photobiological effect of laser light on cells and tissues originates from light absorption by endogenous chromophores and hence it depends on the wavelength of light source and cell type. Earlier studies regarding the biostimulation effects of green laser light investigated a wide variety of cells but not adipose tissue-derived stem cells (ADSCS). In this study we reported the in vitro effect of 532-nm Nd:YAG laser on proliferation, mitochondrial activity of these mesenchymal stem cells (MSCs) on the autofluorescence emission at wavelengths associated with nicotinamide adenine dinucleotide (NADH) and flavoproteins. MATERIALS AND METHODS ADSCS were exposed to 532 nm second harmonic generation laser light at moderate power density (0.153 W/cm(2)) for periods of 30, 45, 60, 180, and 300 seconds. Mitochondrial membrane potential was measured using JC1 stain and confocal laser scanning microscopy, cell proliferation rates, and cellular autofluorescence emission at 450 and 540 nm wavelengths were measured using micro plate spectrofluorometer 48 hours after irradiation. RESULTS Shorter (30-60 seconds) exposure times led to significantly increased proliferation, attributed to increased mitochondrial activity (P < 0.05). At longer exposures we observed a significant decrease in proliferation and autofluorescence (P < 0.05). Strong correlation was observed between proliferation rates of cells and autofluorescence intensity. CONCLUSION Our results show that autofluorescence of the respiratory chain components and key autofluorescent metabolites offers a non-invasive method to quantify cellular response to laser irradiation.
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Affiliation(s)
- Ayad G Anwer
- Ewa M Goldys MQ BioFocus Research Centre, Macquarie University, North Ryde, 2109 NSW, Australia
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Shining light on nanotechnology to help repair and regeneration. Biotechnol Adv 2012; 31:607-31. [PMID: 22951919 DOI: 10.1016/j.biotechadv.2012.08.003] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 08/10/2012] [Accepted: 08/11/2012] [Indexed: 12/27/2022]
Abstract
Phototherapy can be used in two completely different but complementary therapeutic applications. While low level laser (or light) therapy (LLLT) uses red or near-infrared light alone to reduce inflammation, pain and stimulate tissue repair and regeneration, photodynamic therapy (PDT) uses the combination of light plus non-toxic dyes (called photosensitizers) to produce reactive oxygen species that can kill infectious microorganisms and cancer cells or destroy unwanted tissue (neo-vascularization in the choroid, atherosclerotic plaques in the arteries). The recent development of nanotechnology applied to medicine (nanomedicine) has opened a new front of advancement in the field of phototherapy and has provided hope for the development of nanoscale drug delivery platforms for effective killing of pathological cells and to promote repair and regeneration. Despite the well-known beneficial effects of phototherapy and nanomaterials in producing the killing of unwanted cells and promoting repair and regeneration, there are few reports that combine all three elements i.e. phototherapy, nanotechnology and, tissue repair and regeneration. However, these areas in all possible binary combinations have been addressed by many workers. The present review aims at highlighting the combined multi-model applications of phototherapy, nanotechnology and, reparative and regeneration medicine and outlines current strategies, future applications and limitations of nanoscale-assisted phototherapy for the management of cancers, microbial infections and other diseases, and to promote tissue repair and regeneration.
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Pereira LO, Longo JPF, Azevedo RB. Laser irradiation did not increase the proliferation or the differentiation of stem cells from normal and inflamed dental pulp. Arch Oral Biol 2012; 57:1079-85. [DOI: 10.1016/j.archoralbio.2012.02.012] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2011] [Revised: 02/03/2012] [Accepted: 02/06/2012] [Indexed: 01/09/2023]
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Minicucci EM, Miot HA, Barraviera SRCS, Almeida-Lopes L. Low-level laser therapy on the treatment of oral and cutaneous pemphigus vulgaris: case report. Lasers Med Sci 2012; 27:1103-6. [PMID: 22538841 DOI: 10.1007/s10103-012-1101-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Accepted: 04/11/2012] [Indexed: 12/11/2022]
Abstract
Pemphigus vulgaris is a chronic autoimmune mucocutaneous disease that initially is manifested by painful intraoral erosions and ulcers which spread to other mucosa and the skin, generally more than 5 months after oral lesion manifestation. The treatment consists of prednisone alone or in combination with an immunosuppressive agent, and the clinical response is perceived within 2 to 4 weeks. Low-level laser therapy has been effective in accelerating the healing of injured tissue, thus inducing cell proliferation and increasing ATP, nucleic acid, and collagen synthesis. We reported two cases of pemphigus vulgaris that received systemic treatment associated with low-level laser therapy for oral and cutaneous lesions. We observed prompt analgesic effect in oral lesions and accelerated healing of oral and cutaneous wounds. Therefore, the present report suggests LLLT as a noninvasive technique that should be considered as an adjuvant therapy in oral and skin disorders in patients with PV.
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Affiliation(s)
- Eliana Maria Minicucci
- Department of Dermatology and Radiotherapy, Botucatu School of Medicine of São Paulo State University-UNESP, Distrito de Rubião Júnior s/n, 18 618-000, Botucatu, SP, Brazil.
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Lavi R, Ankri R, Sinyakov M, Eichler M, Friedmann H, Shainberg A, Breitbart H, Lubart R. The Plasma Membrane is Involved in the Visible Light–Tissue Interaction. Photomed Laser Surg 2012; 30:14-9. [DOI: 10.1089/pho.2011.3083] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
Affiliation(s)
- Ronit Lavi
- Department of Chemistry, Bar-Ilan University, Ramat-Gan, Israel
| | - Rinat Ankri
- Department of Physics, Bar-Ilan University, Ramat-Gan, Israel
| | - Michael Sinyakov
- The Mina & Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel
| | - Maor Eichler
- Department of Chemistry, Bar-Ilan University, Ramat-Gan, Israel
| | - Harry Friedmann
- Department of Chemistry, Bar-Ilan University, Ramat-Gan, Israel
| | - Asher Shainberg
- The Mina & Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel
| | - Haim Breitbart
- The Mina & Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel
| | - Rachel Lubart
- Department of Chemistry, Bar-Ilan University, Ramat-Gan, Israel
- Department of Physics, Bar-Ilan University, Ramat-Gan, Israel
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Sitharaman B, Avti PK, Schaefer K, Talukdar Y, Longtin JP. A novel nanoparticle-enhanced photoacoustic stimulus for bone tissue engineering. Tissue Eng Part A 2011; 17:1851-8. [PMID: 21395444 DOI: 10.1089/ten.tea.2010.0710] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In this study, we introduce a novel nanoparticle-enhanced biophysical stimulus based on the photoacoustic (PA) effect. We demonstrate that the PA effect differentiates bone marrow-derived marrow stromal cells (MSCs) grown on poly(lactic-co-glycolic acid) (PLGA) polymer films toward osteoblasts. We further show that the osteodifferentiation of the MSCs due to PA stimulation is significantly enhanced by the presence of single-walled carbon nanotubes (SWCNTs) in the polymer. MSCs, without the osteogenic culture supplements (0.01 M β-glycerophosphate, 50 mg/L ascorbic acid, 10(-8) M dexamethasone), were seeded onto plain glass slides, glass slides coated with PLGA, or glass slides coated with SWCNT-PLGA films and photoacoustically stimulated by a 527 nm Nd:YLF pulse laser, with a 200 ns pulse duration, and 10 Hz pulse frequency for 10 min a day for 15 consecutive days. The study had four control groups; three baseline controls similar to the three experimental groups but without PA stimulation, and one positive control where MSCs were grown on glass slides without PA stimulation but with osteogenic culture supplements. The osteogenic differentiation of all the groups was evaluated using quantitative assays (alkaline phosphatase, calcium, osteopontin) and qualitative staining (alizarin red). After 15 days, the PA stimulated groups showed up to a 350% increase in calcium content when compared with the non-PA stimulated positive control. Further, within the PA stimulated group, the PLGA-SWCNT group had 130% higher calcium values than the PLGA film without SWCNTs. These results were further corroborated by the analysis of osteopontin secretion, alkaline phosphatase expression, and qualitative alizarin red staining of extracellular matrix calcification. The results indicate that PA stimulation holds promise for bone tissue engineering and that the nanomaterials which enhance the PA effect should allow the development of biophysical rather than biochemical strategies to induce osteoinductive properties into tissue engineering scaffolds.
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Affiliation(s)
- Balaji Sitharaman
- Department of Biomedical Engineering, State University of New York at Stony Brook, Stony Brook, New York 11794-5281, USA.
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Kim IS, Cho TH, Kim K, Weber FE, Hwang SJ. High power-pulsed Nd:YAG laser as a new stimulus to induce BMP-2 expression in MC3T3-E1 osteoblasts. Lasers Surg Med 2010; 42:510-8. [PMID: 20127830 DOI: 10.1002/lsm.20870] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND AND OBJECTIVE High-power laser has recently become a physical stimulus for bone regeneration. Little is known about how high-power laser irradiation affects osteoblast differentiation. This study investigated osteoblast responses to high-power laser and combined irradiation with BMP-2 treatment. STUDY DESIGN/MATERIALS AND METHODS MC3T3-E1 pre-osteoblasts were exposed to laser irradiation, 100 ng/ml BMP-2 or both. Cells were irradiated with a Q-switched, pulsed neodymium-doped yttrium aluminum garnet (Nd:YAG) laser, with a 1,064 nm wavelength and 0.75 W output power under 1.5, 3, or 5 J/cm(2) energy densities. Cell proliferation was evaluated using tetrazolium salt, WST-8. To determine the effect of these treatments on in vitro osteogenesis, we examined alkaline phosphatase (ALP) activity, mineral deposition, and expression of genes associated with osteogenesis. Quantitative real time PCR or ELISA was used to examine cytokine expression. In each experiment, either non-irradiated or BMP-2 (100 ng/ml)-treated cells were used as controls. RESULTS High-power, low-level, Nd:YAG laser irradiation significantly increased ALP activity, when combined with BMP-2 or not. Cell proliferation declined in the irradiation and combined irradiation/BMP-2 groups. Interestingly, Nd:YAG laser stimulation resulted in significant induction of endogenous BMP-2 protein and gene expression. The increased expression of upstream regulators cbfa1 by Nd:YAG laser alone was comparable to exogenous BMP-2 treatment (100 ng/ml). Combined laser/BMP-2 treatment was synergistic in the expression of some genes (IGF-1, cbfa1) and ALP activity, compared to both BMP-2 treatment and laser irradiation alone. In vitro matrix mineralization was significantly accelerated by laser stimulation compared to that of the control, more so than with the combined laser/BMP-2 treatment. CONCLUSIONS The present in vitro findings demonstrate that high-power, low-level Nd:YAG laser increased osteoblast activity, very efficiently accelerating mineral deposition. Osteoinductive effect of laser is likely mediated by activation of BMP-2-related signaling pathway.
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Affiliation(s)
- In Sook Kim
- Dental Research Institute, Seoul National University, 28 Yeongun-Dong, Chongro-Gu, Seoul, 110-749, Republic of Korea
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Wood VT, Pinfildi CE, Neves MAI, Parizoto NA, Hochman B, Ferreira LM. Collagen changes and realignment induced by low-level laser therapy and low-intensity ultrasound in the calcaneal tendon. Lasers Surg Med 2010; 42:559-65. [PMID: 20662033 DOI: 10.1002/lsm.20932] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND AND OBJECTIVE The treatment of calcaneal tendon injuries requires long-term rehabilitation. Ultrasound (US) and low-level laser therapy (LLLT) are the most used and studied physical agents in the treatment of tendon injuries; however, only a few studies examined the effects of the combination of US and LLLT. Therefore, the purpose of this study was to investigate which treatment (the exclusive or combined use of US and LLLT) most effectively contribute to tendon healing. STUDY DESIGN/MATERIALS AND METHODS This was a controlled laboratory study with 50 rats whose Achilles tendon was injured by direct trauma. The rats were randomly divided into five groups and treated for 5 consecutive days, as follows: group 1 (control) received no treatment; group 2 was treated with US alone; group 3 was treated with LLLT alone; group 4 was treated first with US followed by LLLT; and group 5 was treated first with LLLT followed by US. On the sixth post-injury day, the tendons were removed and examined by polarized light microscopy. The organization of collagen fibers was assessed by birefringence measurements. Picrosirius-stained sections were examined for the presence of types I and III collagen. RESULTS There was a significantly higher organization of collagen fibers in group 2 (US) than in the control group (P = 0.03). The amount of type I collagen found in groups 2 (US), 3 (LLLT), and 5 (LLLT + US) was significantly higher than that in the control group (P <or= 0.01), but no significant differences were found between treatment groups. There were no differences in the amount of type III collagen between groups. CONCLUSION Ultrasound, LLLT, and the combined use of LLLT and US resulted in greater synthesis of type I collagen; US was also effective in increasing collagen organization in the early stages of the healing process.
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Affiliation(s)
- Viviane T Wood
- Division of Plastic Surgery, Universidade Federal de São Paulo (UNIFESP), CEP 04023-002 Sao Paulo, SP, Brazil.
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Da Silva NS, Potrich JW. Effect of GaAlAs laser irradiation on enzyme activity. Photomed Laser Surg 2010; 28:431-4. [PMID: 19857051 DOI: 10.1089/pho.2008.2410] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE The aim of this study was to determine the influence of laser irradiation on enzyme activity. BACKGROUND DATA Enzymes are catalysts of extraordinary efficiency, able to accelerate reactions by manifold. Enzyme laser light activation is currently a fast-growing field and a large number of studies have been produced. MATERIALS AND METHODS Liquid CNPG amylase and control serum (Qualitrol 1H) were used in the experiments. Laboratory analysis of alpha-amylase was performed on two sample groups: (i) E + S and (ii) E + S + L, in six repetitions per irradiation dose. Group 2 was irradiated with gallium-aluminum-arsenide (GaAlAs) 904 nm at doses of 0.01, 0.1, 0.5, and 1 J/cm(2). Enzyme activity was read using a spectrophotometer equipped with a thermostatic chamber capable of precise absorbance measurement at 405 nm. RESULTS The results were analyzed with the Student's t-test, and the percentage of enzyme activity was determined. Photomodulation of alpha-amylase activity by GaAlAs laser was analyzed following irradiation with different doses. Irradiation doses from 0.01 to 1 J/cm(2) led to differences in enzyme activity: 0.01 J/cm(2) (0.10%), 0.1 J/cm(2) (13.44%), 0.5 J/cm(2) (12.57%), and 1 J/cm(2) (-6.10%). CONCLUSION Irradiation doses of 0.1 J/cm(2) and 0.5 J/cm(2) led to statistically significant increases in enzyme activity in comparison to the control. The similar curves of the effects of temperature and pH on enzymatic activity observed in this study suggest that laser irradiation also possess an optimum dose to modulate the enzymatic activity. That is, enzymes have an optimum laser dose (or range) at which their activity is maximal, whereas at higher or lower doses activity decreases.
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Affiliation(s)
- Newton Soares Da Silva
- Laboratório de Biologia Celular & Tecidual, Instituto de Pesquisa & Desenvolvimento, UNIVAP, São José dos Campos, Brazil.
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Jin G, Prabhakaran MP, Liao S, Ramakrishna S. Photosensitive materials and potential of photocurrent mediated tissue regeneration. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2010; 102:93-101. [PMID: 20951603 DOI: 10.1016/j.jphotobiol.2010.09.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2010] [Accepted: 09/22/2010] [Indexed: 10/19/2022]
Abstract
Photocurrent therapy with participation of light and electrical stimulations could be an innovative and promising approach in regenerative medicine, especially for skin and nerve regeneration. Photocurrent is generated when light irradiates on a photosensitive device, and with more and more types of photosensitive materials being synthesized, photocurrent could be applied for enhanced regeneration of tissue. Photosensitive scaffolds such as composite poly (3-hexylthiophene)/polycaprolactone (P3HT/PCL) nanofibers are fabricated by electrospinning process in our lab for skin regeneration in presence of applied photocurrent. This review article discuss on the various in vitro, in vivo and clinical studies that utilized the principle of 'electrotherapy' and 'phototherapy' for regenerative medicine and evaluates the potential application of photocurrent in regenerative medicine. We conclude that photocurrent therapy will play an important role in regenerative medicine.
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Affiliation(s)
- Guorui Jin
- Department of Mechanical Engineering, National University of Singapore, Singapore, Singapore
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Minicucci EM, Barraviera SRCS, Miot H, Almeida-Lopes L. Low-level laser therapy for the treatment of epidermolysis bullosa: A case report. J COSMET LASER THER 2010; 12:203-5. [DOI: 10.3109/14764172.2010.502460] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Chiou JF, Wang YH, Jou MJ, Liu TZ, Shiau CY. Verteporfin-photoinduced apoptosis in HepG2 cells mediated by reactive oxygen and nitrogen species intermediates. Free Radic Res 2009; 44:155-70. [DOI: 10.3109/10715760903380458] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Iaffaldano N, Rosato MP, Paventi G, Pizzuto R, Gambacorta M, Manchisi A, Passarella S. The irradiation of rabbit sperm cells with He-Ne laser prevents their in vitro liquid storage dependent damage. Anim Reprod Sci 2009; 119:123-9. [PMID: 19932573 DOI: 10.1016/j.anireprosci.2009.10.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2009] [Revised: 10/01/2009] [Accepted: 10/06/2009] [Indexed: 10/20/2022]
Abstract
The aim of the study was to investigate the effects of different energy doses of helium-neon (He-Ne) laser irradiation on both mitochondrial bioenergetics functions and functional quality of rabbit spermatozoa during 48 h of in vitro liquid storage at 15 degrees C. 11 rabbit semen pools were each divided into four aliquots: three of them were irradiated with He-Ne laser with different energy doses (3.96, 6.12 and 9.00 J/cm(2)) being the last control kept under the same experimental conditions without irradiation. Sperm motility, viability and acrosome integrity were monitored together with cytochrome c oxidase (COX) activity and the cell energy charge (EC) at 0, 24 and 48 h of storage. Irradiated samples stored for 24 and 48 h better maintained motility (P < 0.01), acrosome integrity (P < 0.01) and viability (P < 0.05) with respect to the control, particularly with the energy dose of 6.12 J/cm(2) that showed the most intense biostimulative effect. COX activity and EC were immediately increased by irradiation particularly in the treatments 6.12 and 9.00 J/cm(2) (P < 0.05), that maintained their levels higher with respect to the control after 48 h of storage (P < 0.01). COX activity of rabbit sperm cells was positively correlated with EC (P < 0.05), viability (P < 0.01) and acrosome integrity (P < 0.05) parameters. These results indicate that the effects of He-Ne laser irradiation on sperm cells are mediated through the stimulation of the sperm mitochondrial respiratory chain and that this effect plays a significant role in the augmentation of the rabbit sperm cells' capability to survive during liquid storage conditions.
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Affiliation(s)
- Nicolaia Iaffaldano
- Department of Animal, Vegetable and Environmental Sciences, University of Molise, 86100 Campobasso, Italy.
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Lim JH, Lee J, Choi J, Hong J, Jhun H, Han J, Kim S. The Effects of Light-Emitting Diode Irradiation at 610 nm and 710 nm on Murine T-Cell Subset Populations. Photomed Laser Surg 2009; 27:813-8. [DOI: 10.1089/pho.2008.2375] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Jeong H. Lim
- Department of Rehabilitation Medicine, Konkuk University Medical Center, Seoul, South Korea
| | - Jongmin Lee
- Department of Rehabilitation Medicine, Konkuk University Medical Center, Seoul, South Korea
| | - Jida Choi
- Department of Biomedical Science and Technology, Konkuk University, Seoul, South Korea
| | - Jaewoo Hong
- Department of Biomedical Science and Technology, Konkuk University, Seoul, South Korea
| | - Hyunjhung Jhun
- Department of Biomedical Science and Technology, Konkuk University, Seoul, South Korea
| | - Jinsoo Han
- College of Veterinary Medicine, Konkuk University, Seoul, South Korea
| | - Soohyun Kim
- Department of Biomedical Science and Technology, Konkuk University, Seoul, South Korea
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Green DE, Longtin JP, Sitharaman B. The effect of nanoparticle-enhanced photoacoustic stimulation on multipotent marrow stromal cells. ACS NANO 2009; 3:2065-72. [PMID: 19606849 DOI: 10.1021/nn900434p] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
In this article, we report a novel nanoparticle-enhanced biophysical technique that differentiates multipotent marrow stromal cells (MSCs) toward osteoblasts. We show that a brief (10 min) daily nanoparticle-facilitated exposure of MSCs to nanosecond pulse laser-induced photoacoustic (PA) stimulation enhances their differentiation toward osteoblasts. To observe osteodifferentiation under PA stimulation, tissue culture plates were seeded with MSCs without the osteogenic culture supplements (OS, 0.01 M beta-glycerophosphate, 50 mg/L ascorbic acid, 10(-8) M dexamethasone) in the presence and absence of single-walled carbon nanotubes (SWNTs) and gold nanoparticles (GNPs). The alkaline phosphatase activity, calcium content, and osteopontin secretion were monitored as indicators of MSCs' differentiation toward osteoblasts. The PA stimulated groups show up to 612% increase in calcium content compared to the controls cultured with osteogenic supplements (without PA stimulation) after 16 days. Among the PA stimulated groups, at day 16, MSCs incubated with SWNTs at 10 microg/mL concentrations showed up to 97% greater calcium content than those that did not contain SWNTs. The results demonstrated that PA stimulation not only promotes osteogenesis but also is synergistically enhanced by the presence of nanoparticles and, thus, has major implications for bone regeneration applications.
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Affiliation(s)
- Danielle E Green
- Department of Biomedical Engineering, State University of New York at Stony Brook, Stony Brook, New York 11794-2300, USA
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Effect of photodynamic therapy on the healing of cutaneous third-degree-burn: histological study in rats. Lasers Med Sci 2009; 25:221-8. [PMID: 19533211 DOI: 10.1007/s10103-009-0694-z] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2009] [Accepted: 05/26/2009] [Indexed: 01/01/2023]
Abstract
The aim of this study was to conduct a histological assessment of the effect of photodynamic therapy (PDT) on the repairing of third-degree-burn wounds made on the backs of rats with a heated scalpel. Ninety-six rats were divided into groups: G1, control (n = 24), cold scalpel; G2, burned, heated scalpel (n = 24); G3, low-level laser therapy (LLLT) (n = 24), on burns; and G4, photodynamic therapy (PDT) (n = 24), toluidine-O blue (100 microg/ml) and LLLT treatment on burns. The laser (685 nm) was applied in continuous mode, 50 mW, 4.5 J/cm(2), contact mode at nine points (9 s/point). Eight animals in each group were killed at 3 days, 7 days or 14 days after surgery, and tissue specimens containing the whole wounded area were removed and processed for histological analysis; the results were statistically analyzed with Kruskal-Wallis and Dunn's tests (P < 0.05). The results demonstrated significant differences between G2 and G3, and between G2 and G4, at both 3 days and 7 days, with regard to acute inflammation scores; G1 and G2 showed significant differences when compared with G4 at 3 days, with regard to neo-angiogenesis scores; G1 and G2 were statistically different from G3 and G4 at both 3 days and 7 days, with regard to re-epithelization scores; G2 showed statistically significant differences when compared with G3 and G4 with regard to collagen fiber scores at 7 days. LLLT and PDT acted as a biostimulating coadjuvant agent, balancing the undesirable effect of the burn on the wound healing process, acting mainly in the early healing stages, hastening inflammation and increasing collagen deposition.
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Kushibiki T, Awazu K. Blue Laser Irradiation Enhances Extracellular Calcification of Primary Mesenchymal Stem Cells. Photomed Laser Surg 2009; 27:493-8. [DOI: 10.1089/pho.2008.2343] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Toshihiro Kushibiki
- Frontier Research Base for Global Young Researchers, Frontier Research Center, Graduate School of Engineering, Osaka University, Osaka, Japan
- PRESTO, Japan Science and Technology Agency, Saitama, Japan
| | - Kunio Awazu
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan
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Oliveira FS, Pinfildi CE, Parizoto NA, Liebano RE, Bossini PS, Garcia ÉB, Ferreira LM. Effect of low level laser therapy (830 nm) with different therapy regimes on the process of tissue repair in partial lesion calcaneous tendon. Lasers Surg Med 2009; 41:271-6. [DOI: 10.1002/lsm.20760] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Hou JF, Zhang H, Yuan X, Li J, Wei YJ, Hu SS. In vitro effects of low-level laser irradiation for bone marrow mesenchymal stem cells: proliferation, growth factors secretion and myogenic differentiation. Lasers Surg Med 2009; 40:726-33. [PMID: 19065562 DOI: 10.1002/lsm.20709] [Citation(s) in RCA: 140] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
BACKGROUND AND OBJECTIVES Bone marrow derived mesenchymal stem cells (BMSCs) have shown to be an appealing source for cell therapy and tissue engineering. Previous studies have confirmed that the application of low-level laser irradiation (LLLI) could affect the cellular process. However, little is known about the effects of LLLI on BMSCs. The aim of this study was designed to investigate the influence of LLLI at different energy densities on BMSCs proliferation, secretion and myogenic differentiation. STUDY DESIGN/MATERIALS AND METHODS BMSCs were harvested from rat fresh bone marrow and exposed to a 635 nm diode laser (60 mW; 0, 0.5, 1.0, 2.0, or 5.0 J/cm(2)). The lactate dehydrogenase (LDH) release was used to assess the cytotoxicity of LLLI at different energy densities. Cell proliferation was evaluated by using 3-(4, 5-dimethylithiazol-2-yl)-2, 5-diphenyl tetrazolium bromide (MTT) and 5-bromo-2'-deoxyuridine (BrdU) assay. Production of vascular endothelial growth factor (VEGF) and nerve growth factor (NGF) were measured by enzyme-linked immunosorbent assay (ELISA). Myogenic differentiation, induced by 5-azacytidine (5-aza), was assessed by using immunocytochemical staining for the expression of sarcomeric alpha-actin and desmin. RESULTS Cytotoxicity assay showed no significant difference between the non-irradiated group and irradiated groups. LLLI significantly stimulated BMSCs proliferation and 0.5 J/cm(2) was found to be an optimal energy density. VEGF and NGF were identified and LLLI at 5.0 J/cm(2) significantly stimulated the secretion. After 5-aza induction, myogenic differentiation was observed in all groups and LLLI at 5.0 J/cm(2) dramatically facilitated the differentiation. CONCLUSIONS LLLI stimulates proliferation, increases growth factors secretion and facilitates myogenic differentiation of BMSCs. Therefore, LLLI may provide a novel approach for the preconditioning of BMSCs in vitro prior to transplantation.
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Affiliation(s)
- Jian-feng Hou
- Department of Surgery, Cardiovascular Institute and Fu Wai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
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Eduardo FDP, Bueno DF, de Freitas PM, Marques MM, Passos-Bueno MR, Eduardo CDP, Zatz M. Stem cell proliferation under low intensity laser irradiation: a preliminary study. Lasers Surg Med 2008; 40:433-8. [PMID: 18649378 DOI: 10.1002/lsm.20646] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND AND OBJECTIVES Phototherapy with low intensity laser irradiation has shown to be effective in promoting the proliferation of different cells. The aim of this in vitro study was to evaluate the potential effect of laser phototherapy (660 nm) on human dental pulp stem cell (hDPSC) proliferation. STUDY DESIGN/MATERIALS AND METHODS The hDPSC cell strain was used. Cells cultured under nutritional deficit (10% FBS) were either irradiated or not (control) using two different power settings (20 mW/6 seconds to 40 mW/3 seconds), with an InGaAIP diode laser. The cell growth was indirectly assessed by measuring the cell mitochondrial activity through the MTT reduction-based cytotoxicity assay. RESULTS The group irradiated with the 20 mW setting presented significantly higher MTT activity at 72 hours than the other two groups (negative control--10% FBS--and lased 40 mW with 3 seconds exposure time). After 24 hours of the first irradiation, cultures grown under nutritional deficit (10% FBS) and irradiated presented significantly higher viable cells than the non-irradiated cultures grown under the same nutritional conditions. CONCLUSIONS Under the conditions of this study it was possible to conclude that the cell strain hDPSC responds positively to laser phototherapy by improving the cell growth when cultured under nutritional deficit conditions. Thus, the association of laser phototherapy and hDPSC cells could be of importance for future tissue engineering and regenerative medicine. Moreover, it opens the possibility of using laser phototherapy for improving the cell growth of other types of stem cells.
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Affiliation(s)
- Fernanda de P Eduardo
- Hospital Israelita Albert Einstein, Unit of Bone Marrow Transplantation, São Paulo 05651-901, SP, Brazil
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Lim JH, Lee J, Lee IS, Kim YJ, Song EY, Choi YS, Yun YM. The effects of daily irradiation with polychromatic visible polarized light on human lymphocyte populations. Photomed Laser Surg 2008; 26:361-6. [PMID: 18647093 DOI: 10.1089/pho.2007.2175] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE The goal of this randomized, placebo controlled, double-blind study was to investigate the effects of transcutaneous irradiation with polychromatic visible polarized light (540-780 nm; 68% polarization; power density 3.0 E-10 W/cm(2)) on a subset population of human lymphocytes using flow cytometry. BACKGROUND DATA The biomodulation and therapeutic effects of visible light of different wavelengths are well known, but the immunological effects of polychromatic visible polarized light have not been investigated sufficiently. METHODS Before and after 28 consecutive days of irradiation, blood samples were collected from the subjects and the population count of the lymphocyte subset was measured. RESULTS The absolute count of total lymphocytes, CD3(+) lymphocytes, and CD3(+)CD4(+) lymphocytes increased by 7% (p = 0.023), 9% (p = 0.058), and 13% (p = 0.021), respectively. Yet the absolute count of WBCs, CD3(+)CD8(+), CD19(+), and CD16(+)56(+) lymphocytes did not change significantly. CONCLUSION The application of polychromatic visible polarized light with the aforementioned features increases the CD3(+)CD4(+) lymphocyte population. It is suggested that this regimen may be useful for the promotion of natural defenses in cell-mediated immunity.
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Affiliation(s)
- Jeong H Lim
- Department of Rehabilitation Medicine, Konkuk University School of Medicine, Seoul, South Korea
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Kushibiki T, Awazu K. Controlling osteogenesis and adipogenesis of mesenchymal stromal cells by regulating a circadian clock protein with laser irradiation. Int J Med Sci 2008; 5:319-26. [PMID: 18974860 PMCID: PMC2574021 DOI: 10.7150/ijms.5.319] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2008] [Accepted: 10/23/2008] [Indexed: 11/18/2022] Open
Abstract
Mesenchymal stromal cells (MSCs) are multipotent cells present in adult bone marrow that replicate as undifferentiated cells and can differentiate to lineages of mesenchymal tissues. Homeostatic control of bone remodelling maintains bone mass by insuring that bone resorption and bone formation occur sequentially and in a balanced manner. As most homeostatic functions occur in a circadian manner, a circadian clock could control bone mass. Here, we show that laser irradiation can direct the osteogenesis and adipogenesis of mouse MSCs by altering the intracellular localization of the circadian rhythm protein Cryptochrome 1 (mCRY1). After laser irradiation (wavelength: 405 nm) to MSCs, circadian rhythm protein, mCRY1 and mPER2, were immunostained and histochemical stainings for osteogenic or adipogenic differentiation were observed. Laser irradiation promoted osteogenesis and reduced adipogenesis of MSCs, induced the translocation of mCRY1 and mPER2 protein from the cytoplasm to the nucleus, and decreased mCRY1 mRNA levels quantified by real-time PCR. Since the timing of nuclear accumulation of clock proteins constitutes an important step in the transcription-translation feedback loop driving the circadian core oscillator, laser irradiation could provide a simple and effective technology for clock protein localization and turnover. Our results also indicate that mCRY1 is a master regulator of circadian rhythm that regulates the differentiation of MSCs. Laser irradiation could provide a simple and effective means of controlling the fate of MSCs as a therapeutic strategy and act 'molecular switch' of regulatory proteins by suppressing CRY transcription. Furthermore, this model system may be useful for exploring the crosstalk between circadian rhythm and cell differentiation.
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Affiliation(s)
- Toshihiro Kushibiki
- 1. Frontier Research Center, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
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Mirzaei M, Bayat M, Mosafa N, Mohsenifar Z, Piryaei A, Farokhi B, Rezaei F, Sadeghi Y, Rakhshan M. Effect of Low-Level Laser Therapy on Skin Fibroblasts of Streptozotocin-Diabetic Rats. Photomed Laser Surg 2007; 25:519-25. [DOI: 10.1089/pho.2007.2098] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - Mohammad Bayat
- Cellular and Molecular Biology Research Center, Shaheed Beheshti Medical University, Tehran, Iran
| | - Nariman Mosafa
- Department of Immunology, Medical Faculty, Shaheed Beheshti Medical University, Tehran, Iran
| | - Zhale Mohsenifar
- Department of Pathology, Ayatollah Taleghani Hospital, Shaheed Beheshti Medical University, Tehran, Iran
| | - Abbas Piryaei
- Cellular and Molecular Biology Research Center, Shaheed Beheshti Medical University, Tehran, Iran
| | - Babak Farokhi
- Department of Immunology, Medical Faculty, Shaheed Beheshti Medical University, Tehran, Iran
| | | | - Yousef Sadeghi
- Cellular and Molecular Biology Research Center, Shaheed Beheshti Medical University, Tehran, Iran
| | - Mohammad Rakhshan
- Department of Pathology, Medical Faculty, Shaheed Beheshti Medical University, Tehran, Iran
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Wu S, Xing D, Wang F, Chen T, Chen WR. Mechanistic study of apoptosis induced by high-fluence low-power laser irradiation using fluorescence imaging techniques. JOURNAL OF BIOMEDICAL OPTICS 2007; 12:064015. [PMID: 18163831 DOI: 10.1117/1.2804923] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Low-power laser irradiation (LPLI) can cause cell proliferation, differentiation, or death; however, the cellular mechanisms of these effects of LPLI, at high or low fluences, are not well known. To investigate the mechanism of high-fluence LPLI-induced apoptosis, both human lung adenocarcinoma cells (ASTC-a-1) and African green monkey SV40-transformed kidney fibroblast cells (COS-7) were irradiated with a He-Ne laser for 10 min under a fluence of 120 J/cm(2) and 80 J/cm(2), respectively. The dynamics of reactive oxygen species (ROS) generation was determined by measuring changes in fluorescence resulting from oxidation of intracellular dichlorodihydrofluorescein diacetate (H(2)DCFDA) to (DCF). The changes of mitochondrial membrane potential, DeltaPsim, were studied by measuring the reduction of cellular fluorescence of Rhodamine 123 dyes using confocal laser scanning microscopy. The activation of caspase-3 in cells transfected by [SCAT3] reporters was observed using fluorescence resonance energy transfer (FRET) imaging. The activity of caspase-8 during high-fluence LPLI-induced apoptosis was studied by monitoring the cellular distribution of [Bid-CFP] reporters using fluorescence imaging. The following temporal sequence of cellular events was observed during apoptosis induced by high-fluence LPLI (120 J/cm(2), ASTC-a-1 cells): (1) immediate generation of mitochondrial ROS following laser irradiation, reaching a maximum level 60 min after irradiation; (2) onset of DeltaPsim decrease 15 min after laser irradiation, reaching a minimum level 50 min after irradiation; and (3) activation of caspase-3 between 30 min and 180 min after laser irradiation. Our results also show that the high-fluence LPLI does not activate caspase-8, indicating that the induced apoptosis was initiated directly from mitochondrial ROS generation and DeltaPsim decrease, independent of the caspase-8 activation.
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Affiliation(s)
- Shengnan Wu
- MOE Key Laboratory of Laser Life Science and Institute of Laser Life Science, Guangzhou 510631, China
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Santos HDL, Rigos CF, Tedesco AC, Ciancaglini P. Biostimulation of Na,K-ATPase by low-energy laser irradiation (685 nm, 35 mW): comparative effects in membrane, solubilized and DPPC:DPPE-liposome reconstituted enzyme. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2007; 89:22-8. [PMID: 17804250 DOI: 10.1016/j.jphotobiol.2007.07.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2007] [Revised: 07/25/2007] [Accepted: 07/30/2007] [Indexed: 11/30/2022]
Abstract
OBJECTIVE The aim of the present work was to investigate the effect of low-energy laser irradiation (685 nm, 35 mW) on the ATPase activity of the different forms of the Na,K-ATPase. METHODS Membrane-bound and solubilized (alphabeta)(2) form of Na,K-ATPase was obtained from the dark red outer medulla of the kidney and proteoliposomes of DPPC:DPPE and Na,K-ATPase was prepared by the co-solubilization method. Irradiations were carried out at 685 nm using an InGaAIP diode laser. RESULTS The ATPase activity of the membrane fraction was not altered with exposition to irradiation doses between 4 and 24 J/cm(2). However, with irradiation doses ranging from 32 to 40 J/cm(2), a 28% increase on the ATPase activity was observed while when using up to 50 J/cm(2) no additional enhancement was observed. When biostimulation was done using the solubilized and purified enzyme or the DPPC:DPPE-liposome reconstituted enzyme, an increase of about 36-40% on the ATPase activity was observed using only 4-8 J/cm(2). With irradiation above these values (24 J/cm(2)) no additional increase in the activity was observed. These studies revealed that the biostimulation of ATPase activity from different forms of the Na,K-ATPase is dose dependent in different ranges of irradiation exposure. The stimulation promoted by visible laser doses was modulated and the process was reverted after 2 h for the enzyme present in the membrane and after about 5 h for the solubilized or the reconstituted in DPPC:DPPE-liposomes.
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Affiliation(s)
- Hérica de Lima Santos
- Universidade Federal de São João Del Rei, Departamento de Ciências Naturais, DCNAT/UFSJ, Brazil
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Eduardo FP, Mehnert DU, Monezi TA, Zezell DM, Schubert MM, Eduardo CP, Marques MM. Cultured epithelial cells response to phototherapy with low intensity laser. Lasers Surg Med 2007; 39:365-72. [PMID: 17457843 DOI: 10.1002/lsm.20481] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
BACKGROUND AND OBJECTIVES Little is known about the intracellular response of epithelial cells to phototherapy. The aim of this in vitro study was to analyze the effect of phototherapy with low-energy lasers with different wavelengths and powers on cultured epithelial cell growth under different nutritional conditions. STUDY DESIGN/MATERIALS AND METHODS Epithelial cell cultures (Vero cell line) grown in nutritional deficit in culture medium supplemented with 2% fetal bovine serum (FBS) were irradiated with low-energy laser from one to three times with a GaAlAs laser (660 nm) and InGaAlP (780 nm), 40 and 70 mW, respectively, with 3 or 5 J/cm2. Cell growth was indirectly assessed by measuring the cell mitochondrial activity. RESULTS Nonirradiated cell cultures grown in nutritional regular medium supplemented with 10% FBS produced higher cell growth than all cultures grown in nutritional deficit irradiated or not. The overall cell growth of cultures grown under nutritionally deficit conditions was significantly improved especially when irradiated with 780 nm for three times. CONCLUSIONS Phototherapy with the laser parameters tested increases epithelial cell growth rate for cells stressed by growth under nutritionally deficient states. This cell growth improvement is directly proportional to the number of irradiations; however, was not enough to reach the full cell growth potential rate of Vero epithelial cell line observed when growing under nutritional regular condition.
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Affiliation(s)
- Fernanda P Eduardo
- Department of Oral Diagnosis, School of Dentistry, University of São Paulo, São Paulo, Brazil
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