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de Alencar Fernandes Neto J, Simões TMS, de Oliveira TKB, Dos Santos Pereira J, Nonaka CFW, de Vasconcelos Catão MHC. Effects of photobiomodulation with blue Light Emitting Diode (LED) on the healing of skin burns. Lasers Med Sci 2023; 38:275. [PMID: 37993749 DOI: 10.1007/s10103-023-03929-5] [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: 07/12/2023] [Accepted: 10/30/2023] [Indexed: 11/24/2023]
Abstract
The management of skin burns is still challenging. Among the therapeutic methods used, there are topical treatments with pharmacological and herbal agents, low-intensity therapeutic ultrasound, use of biomaterials, reconstructive techniques and photobiomodulation therapy. The aim of this study was to evaluate the effects of photobiomodulation with blue Light Emitting Diode (LED) on burn healing. Fifty Wistar rats were divided into control (CTRL) (n = 25) and blue LED (LED) (n = 25), with subgroups (n = 5) for each time of euthanasia (7, 14, 21, 28 and 32 days). Treated animals were daily irradiated (470 nm, 1W, 0.44 W/cm2, 50 J/cm2). Clinical evaluations were performed and the Wound Retraction Index (WRI) was determined. Histological sections were submitted to hematoxylin-eosin, toluidine blue and the immunohistochemical technique, with anti-α-SMA and anti-TGF-β1 antibodies. All data were directly collected by previously calibrated evaluators in a blind manner. The values were included in a statistical program. For all statistical tests used, 5% significance level (p < 0.05) was considered. No statistically significant differences in WRI between groups were observed (p > 0.05). Re-epithelialization was higher using LED at 7 and 14 days (p < 0.05) and greater amount of inflammatory cells was observed at 7 days (p = 0.01). With LED at 21 and 32 days, greater number of mast cells were observed (p < 0.05), as well as smaller number of myofibroblasts at 14, 21, 28 and 32 days (p < 0.05) and lower percentage of TGF-β1 positive cells in the conjunctiva at 7, 14 and 21 days (p < 0.05). Negative correlations were observed in LED between the percentage of TGF-β1 in the epithelium and the mean number of inflammatory cells and number of myofibroblasts (p < 0.05). The results suggest that, depending on the period, blue LED can modulate the healing processes of third-degree skin burns, such as re-epithelialization, inflammatory response, mast cell concentration, myofibroblast differentiation and TGF-β1 immunoexpression. Despite these effects, this therapy does not seem to have significant influence on the retraction of these wounds. Future studies, using different protocols, should be carried out to expand the knowledge about the photobiomodulatory mechanisms of this type of light in the healing process.
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Affiliation(s)
- José de Alencar Fernandes Neto
- Graduate Program in Dentistry, State University of Paraiba, R. Baraúnas, 531, Bodocongó, Campina Grande, PB, 58429-500, Brazil
| | - Thamyres Maria Silva Simões
- Graduate Program in Dentistry, State University of Paraiba, R. Baraúnas, 531, Bodocongó, Campina Grande, PB, 58429-500, Brazil
| | - Tharcia Kiara Beserra de Oliveira
- Faculty of Medical Sciences, University Center UniFacisa, Av. Sen. Argemiro de Figueiredo, 1901, Itararé, Campina Grande, PB, 58411-020, Brazil
| | - Joabe Dos Santos Pereira
- Department of Pathology, Federal University of Rio Grande do Norte, R. General Gustavo Cordeiro de Faria, s/n, Petrópolis, Natal, RN, 59012-570, Brazil
| | - Cassiano Francisco Weege Nonaka
- Graduate Program in Dentistry, State University of Paraiba, R. Baraúnas, 531, Bodocongó, Campina Grande, PB, 58429-500, Brazil
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Li N, Yan X, Cui X, Zhao C, Lin Z, Miao J. Inhibition of annexin A7 suppresses senescence-associated heterochromatin foci formation and senescence through the AMPK/mTOR pathway in human dermal fibroblasts. J Cell Biochem 2023; 124:1603-1614. [PMID: 37682859 DOI: 10.1002/jcb.30472] [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] [Received: 04/23/2023] [Revised: 08/03/2023] [Accepted: 08/27/2023] [Indexed: 09/10/2023]
Abstract
Senescence-associated heterochromatin foci (SAHF) is often used as a biological marker for senescent cells, but the regulation of its formation process is unclear. To find a new modulator of SAHF, we screened our chemical small molecules and found 7-amino-2,3,4,5-tetrahedrobenzo[b][1,4] oxazepin-3-ol (ABO) that was identified as an inhibitor of annexin A7 GTPase (ANXA7) dramatically suppressed the aggregation of heterochromatin protein (HP1γ), an indicator of SAHF. To understand its action mechanism, we first observed the changes in the karyoplasmic ratio of ANXA7 because HP1γ mainly located in the nucleus. The results showed that ABO elevated the protein level of ANXA7 in the nucleus. Therefore, we raised a hypothesis that ANXA7 interacted with HP1γ and regulated its phosphorylation, which is closely related to the formation of SAHF. The co-immunoprecipitation and Western blot experiment results showed that ANXA7 had no direct interaction with HP1γ, however, the phosphorylation of HP1γ was increased by ABO, which suggested that ANXA7 indirectly regulated HP1γ phosphorylation. Then, based on our previous discovery of ANXA7 interacting with AMP-activated protein kinase (AMPK), we investigated the effect of the AMPK/mammalian target of rapamycin (mTOR) signaling pathway on ABO-increased phosphorylation of HP1γ. We found that ABO decreased AMPK phosphorylation and increased the phosphorylation level and activity of mTOR. In the presence of an AMPK activator or mTOR inhibitor, ABO could not increase HP1γ phosphorylation. As a result, ABO inhibited the senescence of human dermal fibroblasts (HDFs). In this study, we found that ANXA7 was a new regulator of SAHF, it could regulate the formation of SAHF through the AMPK/mTOR pathway. The data suggested that ABO could be used as a powerful tool to inhibit the replicative senescence of HDFs.
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Affiliation(s)
- Nan Li
- Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, Shandong University, Qingdao, China
| | - Xiaomeng Yan
- Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, Shandong University, Qingdao, China
| | - Xiaoling Cui
- Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, Shandong University, Qingdao, China
| | - Congyao Zhao
- Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, Shandong University, Qingdao, China
| | - Zhaomin Lin
- Institute of Medical Science, The Second Hospital of Shandong University, Jinan, China
| | - Junying Miao
- Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, Shandong University, Qingdao, China
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da Silva TG, Ribeiro RS, Mencalha AL, de Souza Fonseca A. Photobiomodulation at molecular, cellular, and systemic levels. Lasers Med Sci 2023; 38:136. [PMID: 37310556 DOI: 10.1007/s10103-023-03801-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 06/05/2023] [Indexed: 06/14/2023]
Abstract
Since the reporting of Endre Mester's results, researchers have investigated the biological effects induced by non-ionizing radiation emitted from low-power lasers. Recently, owing to the use of light-emitting diodes (LEDs), the term photobiomodulation (PBM) has been used. However, the molecular, cellular, and systemic effects involved in PBM are still under investigation, and a better understanding of these effects could improve clinical safety and efficacy. Our aim was to review the molecular, cellular, and systemic effects involved in PBM to elucidate the levels of biological complexity. PBM occurs as a consequence of photon-photoacceptor interactions, which lead to the production of trigger molecules capable of inducing signaling, effector molecules, and transcription factors, which feature it at the molecular level. These molecules and factors are responsible for cellular effects, such as cell proliferation, migration, differentiation, and apoptosis, which feature PBM at the cellular level. Finally, molecular and cellular effects are responsible for systemic effects, such as modulation of the inflammatory process, promotion of tissue repair and wound healing, reduction of edema and pain, and improvement of muscle performance, which features PBM at the systemic level.
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Affiliation(s)
- Thayssa Gomes da Silva
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Vila Isabel, Boulevard 28 de Setembro, 87, Rio de Janeiro, 20551030, Brazil.
| | - Rickson Souza Ribeiro
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Vila Isabel, Boulevard 28 de Setembro, 87, Rio de Janeiro, 20551030, Brazil
| | - Andre Luiz Mencalha
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Vila Isabel, Boulevard 28 de Setembro, 87, Rio de Janeiro, 20551030, Brazil
| | - Adenilson de Souza Fonseca
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Vila Isabel, Boulevard 28 de Setembro, 87, Rio de Janeiro, 20551030, Brazil
- Departamento de Ciências Fisiológicas, Instituto Biomédico, Universidade Federal do Estado do Rio de Janeiro, Rua Frei Caneca, 94, Rio de Janeiro, 20211040, Brazil
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Deana NF, Zaror C, Del Sol M, Bagnato VS, Alves N. Wound contraction rate in excised and unexcised burn wounds with laser photobiomodulation: Systematic review and meta-analysis of preclinical studies. Burns 2023; 49:261-274. [PMID: 35842272 DOI: 10.1016/j.burns.2022.05.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 05/04/2022] [Accepted: 05/09/2022] [Indexed: 12/09/2022]
Abstract
INTRODUCTION Laser photobiomodulation (laser PBM) is an effective means of accelerating burn wound contraction, however it is still unclear whether laser PBM produces greater benefit when applied directly to excised and unexcised burn wounds . The aim of this systematic review of preclinical studies was to determine the effectiveness of laser PBM in the wound contraction rate in excised and unexcised burn wounds. MATERIALS AND METHODS A systematic search was conducted in the EMBASE, MEDLINE and LILACS databases. Preclinical studies were included that analysed the effectiveness of laser PBM in burn wound contraction, and assessed wound closure. The SYRCLE risk of bias tool was used. Random effects models were used to estimate the pooled effect. RESULTS Thirteen studies were included in the qualitative analysis and six in the quantitative analysis. Two weeks after the lesion, laser PBM favoured the wound contraction percentage, increasing the closure rate in excised burn wounds (SMD= 1.34, CI 95% 0.41 to 2.27, 0.41-2.27, I2=0%, =0%, low certainty of evidence. In unexcised burns, it was uncertain whether laser PBM increased or diminished the wound contraction rate (SMD=1.22(SMD=1.22 CI 95% -0.05 to 2.49, I2=68%; =68%; very low certainty of evidence). CONCLUSIONS In the animal model, laser PBM is effective in increasing the wound contraction rate in excised burns. However, due to the low certainty of the evidence, uncertainty remains about the true magnitude of the effect of laser on wound contraction in animals; our results should therefore be interpreted with caution.
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Affiliation(s)
- Naira Figueiredo Deana
- Center for Research in Epidemiology, Economics and Oral Public Health (CIEESPO), Faculty of Dentistry, Universidad de La Frontera, Temuco, Chile; Department of Paediatric Dentistry and Orthodontics, Faculty of Dentistry, Universidad de La Frontera, Temuco, Chile; Doctoral Program in Morphological Sciences, Universidad de La Frontera, Temuco, Chile
| | - Carlos Zaror
- Center for Research in Epidemiology, Economics and Oral Public Health (CIEESPO), Faculty of Dentistry, Universidad de La Frontera, Temuco, Chile; Department of Paediatric Dentistry and Orthodontics, Faculty of Dentistry, Universidad de La Frontera, Temuco, Chile; Faculty of Dentistry, Universidad San Sebastian, Puerto Montt, Chile
| | - Mariano Del Sol
- Center of Excellence in Surgical and Morphological Research (CEMyQ), Faculty of Medicine, Universidad de La Frontera, Temuco, Chile
| | - Vanderlei Salvador Bagnato
- São Carlos Institute of Physics, University of São Paulo, Avenida Trabalhador São Carlense, 400, Parque Arnold Schimidt, CEP: 13.566-590, São Carlos, São Paulo, Brazil
| | - Nilton Alves
- Center of Excellence in Surgical and Morphological Research (CEMyQ), Faculty of Medicine, Universidad de La Frontera, Temuco, Chile; Applied Morphology Research Centre (CIMA), Faculty of Dentistry, Universidad de La Frontera, Temuco, Chile.
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Carroll JD. 2021 July Summary of Photobiomodulation Literature. Photobiomodul Photomed Laser Surg 2021; 39:682-684. [DOI: 10.1089/photob.2021.0118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- James D. Carroll
- Founder, CEO at THOR Photomedicine Ltd., Chesham Bois, England, UK
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