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Blue light therapy

Monique Narciso Alba, Marli Gerenutti, Valquíria Miwa Hanai Yoshida, Denise Grotto
Acne vulgaris treatments usually cause sensitivity, teratogenicity and bacterial resistance. Investigations of others therapeutic techniques, such as phototherapy, is highly relevant. Thus, we compared the effectiveness of two Acne vulgaris treatments in adolescents: peeling with salicylic acid and phototherapy. Teens were randomly divided in: group I, treatment with salicylic acid peels (10 %) and group II, treatment with phototherapy (blue LED and red laser lights). Photographs were taken before and after ten sessions of each treatment, carried out weekly, and compared...
October 20, 2016: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Marika Rai, David Spratt, Paola R Gomez-Pereira, Jay Patel, Sean P Nair
Oral malodour is a common condition which affects a large proportion of the population, resulting in social, emotional and psychological stress. Certain oral bacteria form a coating called a biofilm on the tongue dorsum and degrade organic compounds releasing volatile sulfur compounds that are malodourous. Current chemical treatments for oral malodour such as mouthwashes containing chlorhexidine or essential oils, are not sufficiently effective at reducing the bacterial load on the tongue. One potential alternative to current chemical treatments for oral malodour is the use of light activated antimicrobial agents (LAAAs), which display no toxicity or antimicrobial activity in the dark, but when exposed to light of a specific wavelength produce reactive oxygen species which induce damage to target cells in a process known as photodynamic inactivation...
October 18, 2016: Journal of Breath Research
G Iakimova, S Dimitrova, T Burté
OBJECTIVES: Computer-delivered Cognitive Behavioral Therapies (C-CBT) are emerging as therapeutic techniques which contribute to overcome the barriers of health care access in adult populations with depression. The C-CBTs provide CBT techniques in a highly structured format comprising a number of educational lessons, homework, multimedia illustrations and supplementary materials via interactive computer interfaces. Programs are often administrated with a minimal or regular support provided by a clinician or a technician via email, telephone, online forums, or during face-to-face consultations...
October 10, 2016: L'Encéphale
Renlu Han, Haopeng Yi, Junhui Shi, Zongjun Liu, Hao Wang, Yafei Hou, You Wang
A multifunctional platform with pH-responsive drug release and near-infrared (NIR) light-triggered photodynamic therapy (PDT) was designed and prepared using the novel core-shell-shell structure. The multifunctional platform consists of an upconversion nanoparticle (UCNP) emission core, a photosensitizer methylene blue (MB) embedded dense silica sandwich shell, and a polyethyleneimine conjugated folic acid (PEI-FA) gated mesoporous silica (MS) outmost shell with doxorubicin hydrochloride (DOX) loaded inside...
September 14, 2016: Physical Chemistry Chemical Physics: PCCP
Jelena Barbaric, Rachel Abbott, Pawel Posadzki, Mate Car, Laura H Gunn, Alison M Layton, Azeem Majeed, Josip Car
BACKGROUND: Acne vulgaris is a very common skin problem that presents with blackheads, whiteheads, and inflamed spots. It frequently results in physical scarring and may cause psychological distress. The use of oral and topical treatments can be limited in some people due to ineffectiveness, inconvenience, poor tolerability or side-effects. Some studies have suggested promising results for light therapies. OBJECTIVES: To explore the effects of light treatment of different wavelengths for acne...
September 27, 2016: Cochrane Database of Systematic Reviews
Ming-Hsien Chan, Chieh-Wei Chen, I-Jung Lee, Yung-Chieh Chan, Datao Tu, Michael Hsiao, Chung-Hsuan Chen, Xueyuan Chen, Ru-Shi Liu
Photodynamic therapy (PDT) is a promising antitumor treatment that is based on photosensitizers. This therapy kills cancer cells by generating reactive oxygen species (ROS) after irradiation with specific laser wavelengths. Being a potential photosensitizer, graphitic carbon nitride (g-C3N4) quantum dots (QDs) are noncytotoxic. Although the use of g-C3N4 QDs is challenged by the limited tissue penetration of UV light, g-C3N4 QDs display excellent ultraviolet (UV) light-triggered cytotoxicity. The g-C3N4 QDs were synthesized using a solid-phase hydrothermal method...
October 17, 2016: Inorganic Chemistry
D Chuard, V Anthonipillai, R Dendale, C Nauraye, E Khan, C Mabit, L De Marzi, L Narici
Particle therapy provides an opportunity to study the human response to space radiation in ground-based facilities. On this basis, a study of light flashes analogous to astronauts' phosphenes reported by patients undergoing ocular proton therapy has been undertaken. The influence of treatment parameters on phosphene generation was investigated for 430 patients treated for a choroidal melanoma at the proton therapy centre of the Institut Curie (ICPO) in Orsay, France, between 2008 and 2011. 60% of them report light flashes, which are predominantly (74%) blue...
August 2016: Life Sciences in Space Research
Yuguang Wang, Ying-Ying Huang, Yong Wang, Peijun Lyu, Michael R Hamblin
UNLABELLED: Human adipose-derived stem cells (hASCs) have the potential to differentiate into several different cell types including osteoblasts. Photobiomodulation (PBM) or low level laser therapy (LLLT) using red or near-infrared wavelengths has been reported to have effects on both proliferation and osteogenic differentiation of stem cells. We examined the effects of delivering four different wavelengths (420 nm, 540 nm, 660 nm, 810 nm) at the same dose (3 J/cm(2)) five times (every two days) on hASCs cultured in osteogenic medium over three weeks...
2016: Scientific Reports
Zenildo Santos Silva, Ying-Ying Huang, Lucas Freitas de Freitas, Cristiane Miranda França, Sergio Brossi Botta, Patrícia Aparecida Ana, Raquel Agnelli Mesquita-Ferrari, Kristianne Porta Santos Fernandes, Alessandro Deana, Cintia Raquel Lima Leal, Renato Araujo Prates, Michael R Hamblin, Sandra Kalil Bussadori
This study intended to evaluate the effects of a papain-gel with a red-light absorbing pigment (methylene blue - MB) to mediate photodynamic therapy (PDT) against Streptococcus mutans biofilms. The PapaMBlue was compared with free MB to generate reactive oxygen species using fluorescence probes (SOSG and HPF). PDT (660-nm light) was carried out against S. mutans biofilms grown on either plastic dishes or on collagen membrane and assayed by CFU, live-dead staining using confocal microscopy, transmission electron microscopy and H&E staining for collagen films...
2016: Scientific Reports
Sneha S Kelkar, Eleanor McCabe-Lankford, Richard Albright, Phil Harrington, Nicole H Levi-Polyachenko
BACKGROUND AND OBJECTIVE: Photothermal therapy (PTT) has several applications in the areas of wound healing, pain management, bacterial infection control, and cancer treatment dependent on the temperature that is generated. PTT is often used exclusively with near infrared (NIR) light and most nanoparticles (NP) used for PTT are designed to absorb within one narrow range of wavelengths. We have developed a dual-wavelength photothermal therapy by capitalizing on the dual absorption of nanoparticles in the blue and NIR range...
September 16, 2016: Lasers in Surgery and Medicine
Karina Paci, Rebecca Todd Bell, Beth Goldstein
No abstract text is available yet for this article.
August 2016: Cutis; Cutaneous Medicine for the Practitioner
Catia Cilene Nass Sebrão, Arandi Ginane Bezerra Junior, Paulo Henrique Condeixa de França, Leslie Ecker Ferreira, Vania Portela Ditzel Westphalen
The aim of this in vitro study was to compare the efficiency of a photodynamic therapy (PDT) technique employing rose bengal (RB) and methylene blue (MB) as photosensitizers (PSs) to reduce the viability of Enterococcus faecalis, a well-known pathogen found in root canal systems. Currently, in several clinical applications, including in the field of endodontics, MB is employed in association with a red laser source for the photoinactivation of pathogenic bacteria. Here, it was used at 0.01% (31.2 mol/L) in association with a red (660 nm) laser as the excitation source in the MB group (MBG)...
September 9, 2016: Photomedicine and Laser Surgery
James M Spencer, Scott A Freeman
INTRODUCTION: Photodynamic Therapy (PDT) with topical Levulan is an approved and efficacious method for treating actinic keratoses. This therapy depends on the ability of the Levulan (delta amino levulinic acid) to penetrate the stratum corneum and enter the cells of the epidermis. Microneedling is an increasing popular cosmetic therapy in which an array of tiny needles is used to make holes in the epidermis and presumably induce a wound healing cascade that leads to cosmetic improvement of the skin...
September 1, 2016: Journal of Drugs in Dermatology: JDD
Tina Rödig, Sarah Endres, Frank Konietschke, Ortrud Zimmermann, Hans Georg Sydow, Annette Wiegand
OBJECTIVES: This in vitro study evaluated the effect of fiber insertion depth on antimicrobial efficacy of antimicrobial photodynamic therapy (aPDT) using a photosensitizer (PS; toluidine blue) and a red light-emitting diode (LED) in root canals infected with Enterococcus faecalis. MATERIALS AND METHODS: Single-rooted extracted teeth were prepared with nickel-titanium-instruments, sterilized, contaminated with E. faecalis, and incubated for 72 h. Roots were randomly divided into four experimental groups: PS only, LED only, aPDT with LED in the apical third, aPDT with LED in the coronal third, as well as into infection and sterile controls (each n = 10)...
September 3, 2016: Clinical Oral Investigations
Khalid M AlGhamdi, Ashok Kumar, Attieh A Al-Ghamdi, Ammar C Al-Rikabi, Mohammed Mubarek, Abdelkader E Ashour
The aim of this study was to investigate the effects of the different types of low-level laser therapy (LLLT) on the ultra-structure and number of melanosomes in normal cultured human melanocytes. Specific effects of various types of LLLT on the ultra-structure of melanosomes have not yet been reported. Melanocytes were exposed to LLLT at an energy level of 2.0 J/cm(2), using a blue (457 nm), red (635 nm), or ultraviolet (UV) (355 nm) laser. After 72 h of irradiation, the melanocytes were fixed in 2.5 % glutaraldehyde (pH 7...
August 30, 2016: Lasers in Medical Science
Shaowei Wang, Xinyuan Zhao, Shaochuan Wang, Jun Qian, Sailing He
Multifunctional drug delivery and combined multimodal therapy strategies are very promising in tumor theranostic applications. In this work, a simple and versatile nanoplatform based on biologically inspired polydopamine capped gold nanorods (GNR-PDA) is developed. Dopamine, a well-known neurotransmitter associated with many neuronal disorders, can undergo self-polymerization on the surface of GNRs to form a stable PDA shell. Its unique molecular adsorption property, as well as its high chemical stability and biocompatibility, facilitate GNR-PDA as an ideal candidate for drug delivery...
September 21, 2016: ACS Applied Materials & Interfaces
Fatma Elzahraa Akram, Tarek El-Tayeb, Khaled Abou-Aisha, Mohamed El-Azizi
BACKGROUND: Silver nanoparticles (AgNPs) are potential antimicrobials agents, which can be considered as an alternative to antibiotics for the treatment of infections caused by multi-drug resistant bacteria. The antimicrobial effects of double and triple combinations of AgNPs, visible blue light, and the conventional antibiotics amoxicillin, azithromycin, clarithromycin, linezolid, and vancomycin, against ten clinical isolates of methicillin-resistant Staphylococcus aureus (MRSA) were investigated...
2016: Annals of Clinical Microbiology and Antimicrobials
Vahid Khori, Ali Mohammad Alizadeh, Zohre Gheisary, Sadaf Farsinejad, Farrokh Najafi, Solmaz Khalighfard, Fatemeh Ghafari, Maryam Hadji, Hamid Khodayari
Low-level laser therapy (LLLT) is a form of photon therapy which can be a non-invasive therapeutic procedure in cancer therapy using low-intensity light in the range of 450-800 nm. One of the main functional features of laser therapy is the photobiostimulation effects of low-level lasers on various biological systems including altering DNA synthesis and modifying gene expression, and stopping cellular proliferation. This study investigated the effects of LLLT on mice mammary tumor and the expression of Let-7a, miR155, miR21, miR125, and miR376b in the plasma and tumor samples...
August 12, 2016: Lasers in Medical Science
Xiao-Qiang Wang, Qi Lei, Jing-Yi Zhu, Wen-Jing Wang, Qian Cheng, Fan Gao, Yun-Xia Sun, Xian-Zheng Zhang
Activatable photosensitizers (aPSs) have emerged as promising photodynamic therapy (PDT) agents for simultaneous imaging and selective ablation of cancer. However, traditional synthetic aPSs are limited by complex design and tedious synthesis. Here, aPS regulated by cucurbit[8]uril (CB[8]) for targeted cancer imaging and PDT is reported. This system is based on the host-guest interaction between biotinylated toluidine blue (TB-B) and CB[8] to form 2TB-B@CB[8]. Moreover, a facile strategy to turn off/on the fluorescence and photodynamic activity of TB-B is developed through the reversible assembly/disassembly of 2TB-B@CB[8]...
September 7, 2016: ACS Applied Materials & Interfaces
Saini Setua, Sheema Khan, Murali M Yallapu, Stephen W Behrman, Mohammed Sikander, Shabia Shabir Khan, Meena Jaggi, Subhash C Chauhan
INTRODUCTION: The functional significance of lost microRNAs has been reported in several human malignancies, including pancreatic cancer (PC). Our prior work has identified microRNA-145 (miR-145) as a tumor suppressor microRNA (miRNA) in pancreatic cancer. The restoration of miR-145 downregulates a number of oncogenes including mucin MUC13, a transmembrane glycoprotein that is aberrantly expressed in pancreatic cancer, thus efficiently inhibiting tumor growth in mice. However, lack of an effective tumor-specific delivery system remains an unmet clinical challenge for successful translation of microRNAs...
August 9, 2016: Journal of Gastrointestinal Surgery: Official Journal of the Society for Surgery of the Alimentary Tract
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