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Thompson BJ, Kumar A, Huxter VM. Concentration-dependent aggregation of methylene blue acting as a photoredox catalyst. Phys Chem Chem Phys 2024; 26:19900-19907. [PMID: 38990130 DOI: 10.1039/d4cp02026j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/12/2024]
Abstract
Hydroxylation reactions are important in biological processes and synthetic schemes. Many challenging hydroxylation reactions have been achieved using photoredox catalytic methods. For the oxidative hydroxylation of arylboronic acids, methylene blue has been used successfully as a photoredox catalyst to produce phenyl groups. Here we use broadband transient absorption spectroscopy to determine the mechanism of the photoredox catalytic reaction of methylene blue with phenylboronic acid in the presence of N,N-diisopropylethylamine. Our results show that the reaction proceeds through the triplet state of methylene blue in the presence of oxygen, generating superoxide radical anions. In addition, we observe dimerization of the methylene blue at typical catalytic loadings. As these dimers do not participate in the reaction, increasing the concentration of methylene blue is potentially detrimental to the overall yield.
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Affiliation(s)
- Benjamin J Thompson
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, USA.
- Department of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA
| | - Anshu Kumar
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, USA.
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - Vanessa M Huxter
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, USA.
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
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2
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Pominova D, Ryabova A, Skobeltsin A, Markova I, Linkov K, Romanishkin I. The use of methylene blue to control the tumor oxygenation level. Photodiagnosis Photodyn Ther 2024; 46:104047. [PMID: 38503388 DOI: 10.1016/j.pdpdt.2024.104047] [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: 10/31/2023] [Revised: 02/12/2024] [Accepted: 03/08/2024] [Indexed: 03/21/2024]
Abstract
BACKGROUND Hypoxia is a characteristic feature of many tumors. It promotes tumor proliferation, metastasis, and invasion and can reduce the effectiveness of many types of cancer treatment. OBJECTIVE The aim of this study was to investigate the pharmacokinetics of methylene blue (MB) and its impact on the tumor oxygenation level at mouse Lewis lung carcinoma (LLC) model using spectroscopic methods. APPROACH The pharmacokinetics of MB were studied qualitatively and quantitatively using video fluorescence imaging and fluorescence spectroscopy. The degree of hemoglobin oxygenation in vivo was examined by calculating hemoglobin optical absorption from the measured diffuse reflectance spectra. The distribution of MB fluorescence and the lifetime of NADH were analyzed using laser scanning microscopy and fluorescence lifetime imaging microscopy (FLIM) to assess cellular metabolism. RESULTS After intravenous administration of MB at 10-20 mg/kg, it quickly transitioned in the tumor to a colorless leucomethylene blue, with maximum accumulation in the tumor occurring after 5-10 min. A concentration of 10 mg/kg resulted in a relative increase of the tumor oxygenation level for small tumors (volume 50-75 mm3) and normal tissue 120 min after the introduction of MB. A shift in tumor metabolism towards oxidative phosphorylation (according to the lifetime of the NADH coenzyme) was measured using FLIM method after intravenous administration of 10 mg/kg of MB. Intravenous administration of MB at 20 mg/kg results in a long-term decrease in oxygenation, which persisted for at least 120 min after the administration and did not return to its initial level. CONCLUSIONS Administration of MB at 10 mg/kg shown to increase tumor oxygenation level, potentially leading to more effective antitumor therapy. However, at higher doses (20 mg/kg), MB may cause long-term decrease in oxygenation.
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Affiliation(s)
- Daria Pominova
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia; National Research Nuclear University MEPhI, Moscow, Russia
| | - Anastasia Ryabova
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia; National Research Nuclear University MEPhI, Moscow, Russia
| | - Alexey Skobeltsin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia; National Research Nuclear University MEPhI, Moscow, Russia
| | - Inessa Markova
- National Research Nuclear University MEPhI, Moscow, Russia
| | - Kirill Linkov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
| | - Igor Romanishkin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
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Tsai CF, Chung JJ, Ding SJ, Chen CC. In vitro cytotoxicity and antibacterial activity of hypochlorous acid antimicrobial agent. J Dent Sci 2024; 19:345-356. [PMID: 38303880 PMCID: PMC10829635 DOI: 10.1016/j.jds.2023.07.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 07/03/2023] [Indexed: 02/03/2024] Open
Abstract
Background/purpose Bacteria-associated oral diseases such as dental caries and periodontitis are widespread epidemics that cause oral pain and loss of function. The purpose of this study was to evaluate the in vitro cytotoxicity and antibacterial activity of different concentrations of hypochlorous acid (HOCl). Materials and methods Five different concentrations (100, 200, 300, 400, and 500 ppm) of HOCl were evaluated for their antimicrobial efficacy against Gram-negative (A. actinomycetcmcomitans and P. gingivalis) and Gram-positive bacteria (S. mutans and S. sanguinis) after treatment for 1 and 10 min. Sodium hypochlorite (NaOCl) and chlorhexidine (CHX) were used as positive controls. In addition, HOCl was examined for L929 cytotoxicity and RAW 264.7 growth. Results The bacteriostatic ratio of NaOCl was comparable to that of CHX and significantly (P < 0.05) higher than that of all HOCl solutions. Higher HOCl concentration had significantly (P < 0.05) higher antibacterial effect, and the bacteriostatic ratio of 10 min treatment was slightly higher than that of 1 min treatment. CHX and NaOCl seeded into L929 cells resulted in low cell viability with only 30-39%, much significantly (P < 0.05) lower than all HOCl groups (greater than 80%). All HOCl solutions met the recommendations of ISO 10993-5 and showed no cytotoxicity, although there was a concentration-dependent decrease in cell viability. All antimicrobial agents showed the same trend of response to RAW 264.7 as L929. Conclusion Within the limit of this study, 400 ppm HOCl disinfectant may be a potential antimicrobial candidate for mouthwash, endodontic irrigants, and periodontitis treatment.
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Affiliation(s)
- Cheng-Feng Tsai
- Institute of Oral Science, Chung Shan Medical University, Taichung, Taiwan
| | - Jia-Jia Chung
- Institute of Oral Science, Chung Shan Medical University, Taichung, Taiwan
| | - Shinn-Jyh Ding
- Institute of Oral Science, Chung Shan Medical University, Taichung, Taiwan
- Department of Stomatology, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Chun-Cheng Chen
- Department of Stomatology, Chung Shan Medical University Hospital, Taichung, Taiwan
- School of Dentistry, Chung Shan Medical University, Taichung, Taiwan
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Sandberg E, Srambickal CV, Piguet J, Liu H, Widengren J. Local monitoring of photosensitizer transient states provides feedback for enhanced efficiency and targeting selectivity in photodynamic therapy. Sci Rep 2023; 13:16829. [PMID: 37803073 PMCID: PMC10558575 DOI: 10.1038/s41598-023-43625-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 09/26/2023] [Indexed: 10/08/2023] Open
Abstract
Photodynamic therapy (PDT) fundamentally relies on local generation of PDT precursor states in added photosensitizers (PS), particularly triplet and photo-radical states. Monitoring these states in situ can provide important feedback but is difficult in practice. The states are strongly influenced by local oxygenation, pH and redox conditions, often varying significantly at PDT treatment sites. To overcome this problem, we followed local PDT precursor state populations of PS compounds, via their fluorescence intensity response to systematically varied excitation light modulation. Thereby, we could demonstrate local monitoring of PDT precursor states of methylene blue (MB) and IRdye700DX (IR700), and determined their transitions rates under different oxygenation, pH and redox conditions. By fiber-optics, using one fiber for both excitation and fluorescence detection, the triplet and photo-radical state kinetics of locally applied MB and IR700 could then be monitored in a tissue sample. Finally, potassium iodide and ascorbate were added as possible PDT adjuvants, enhancing intersystem crossing and photoreduction, respectively, and their effects on the PDT precursor states of MB and IR700 could be locally monitored. Taken together, the presented procedure overcomes current methodological limitations and can offer feedback, guiding both excitation and PDT adjuvant application, and thereby more efficient and targeted PDT treatments.
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Affiliation(s)
- Elin Sandberg
- Experimental Biomolecular Physics, Dept. Applied Physics, Royal Institute of Technology (KTH), Albanova Univ Center, 106 91, Stockholm, Sweden
| | - Chinmaya V Srambickal
- Experimental Biomolecular Physics, Dept. Applied Physics, Royal Institute of Technology (KTH), Albanova Univ Center, 106 91, Stockholm, Sweden
| | - Joachim Piguet
- Experimental Biomolecular Physics, Dept. Applied Physics, Royal Institute of Technology (KTH), Albanova Univ Center, 106 91, Stockholm, Sweden
| | - Haichun Liu
- Experimental Biomolecular Physics, Dept. Applied Physics, Royal Institute of Technology (KTH), Albanova Univ Center, 106 91, Stockholm, Sweden
| | - Jerker Widengren
- Experimental Biomolecular Physics, Dept. Applied Physics, Royal Institute of Technology (KTH), Albanova Univ Center, 106 91, Stockholm, Sweden.
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Xie Y, Wu H, Chen Z, Sun Q, Liu X, Jiang J, Wang B, Chen Z. Non-invasive evaluation of transdermal drug delivery using 3-D transient triplet differential (TTD) photoacoustic imaging. PHOTOACOUSTICS 2023; 32:100530. [PMID: 37645257 PMCID: PMC10461203 DOI: 10.1016/j.pacs.2023.100530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 05/31/2023] [Accepted: 07/08/2023] [Indexed: 08/31/2023]
Abstract
Transdermal drug delivery (TDD) is less invasive and avoids first-pass metabolism, making it an attractive method for treating various diseases such as diabetes and hypertension. However, current methods for evaluating TDD systems lack in vivo descriptions of drug distribution in the skin. In this study, we demonstrate the capability of the Transient Triplet Differential (TTD) method, a non-invasive and background-free photoacoustic imaging technique, for accurately mapping drug distribution and evaluating different TDD systems. Our findings show that the TTD method can provide high sensitivity and specificity for targeted drug extraction and visualize 3D drug distribution in the skin. Furthermore, in vivo experiments confirmed the potential of the TTD method in evaluating the clinical performance of TDD. It's predictable that the TTD method can be a reliable and non-invasive approach for evaluating TDD systems and offer valuable insights into TDD research and development.
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Affiliation(s)
- Yang Xie
- School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
| | - Huayi Wu
- School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
| | - Ziyan Chen
- School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
| | - Qi Sun
- School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
| | - Xiangdong Liu
- School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
| | - Jinsheng Jiang
- Department of Biomedical Engineering, School of Basic Medical Science, Central South University, Changsha 410083, China
| | - Bo Wang
- Department of Biomedical Engineering, School of Basic Medical Science, Central South University, Changsha 410083, China
| | - Zeyu Chen
- School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
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AlSunbul H, Murriky A. Efficacy of methylene blue and curcumin mediated antimicrobial photodynamic therapy in the treatment of indirect pulp capping in permanent molar teeth. Photodiagnosis Photodyn Ther 2023; 42:103598. [PMID: 37150490 DOI: 10.1016/j.pdpdt.2023.103598] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 05/03/2023] [Accepted: 05/05/2023] [Indexed: 05/09/2023]
Abstract
PURPOSE This study aimed to evaluate the adhesive bond strength and antibacterial efficacy of methylene blue (MB)-mediated antimicrobial photodynamic therapy (aPDT) and curcumin (CUR)-mediated aPDT versus the conventional disinfectants, such as chlorhexidine gluconate (CHX) gel and sodium hypochlorite (NaOCl), for indirect pulp capping (IPC) treatment of permanent molars. METHODS One Hundred grossly carious human permanent molars were collected through non-traumatic extraction. All specimens were embedded in polyvinyl cross-sections to the cemento-enamel junction. The cavity preparation was conducted by grinding the samples using silicon carbide discs. After culturing Streptococcus mutans (S. mutans), a 10 µL of S. mutans suspension (106 colony forming units/mL) was transferred in each tooth cavity and anaerobically incubated for 48 hours at 37°C. All specimens were randomly divided into 5 groups: Group-I: samples treated IPC; Group-II: samples treated with 2% CHX gel; Group-III: samples treated with 6% NaOCl; Group-IV: irradiation of prepared cavity with MB-mediated aPDT; and Group-V: irradiation of prepared cavity with CUR-mediated aPDT. After disinfection methods, the universal adhesive was used, and all specimens were restored using giomer. Eventually, confocal laser scanning microscopy, shear bond strength (SBS), micro-tensile bond strength (μTBS), four-point bending strength (4P-BS) analyses were performed, and the data were analyzed statistically. RESULTS At baseline, the highest SBS (48.8 ± 6.5 MPa), μTBS (54.3 ± 3.9 MPa), and 4P-BS (123 ± 32 MPa) scores were demonstrated by the samples treated with MB-mediated aPDT. However, after 12 months of storage, the highest SBS (42.3 ± 3.9 MPa) and μTBS (45.2 ± 6.6 MPa) scores were shown by samples treated with MB-mediated aPDT, while CUR-mediated aPDT treated samples demonstrated the highest 4P-BS scores (70 ± 18 MPa). Moreover, the highest antibacterial activity against S. mutans was shown by the samples treated with MB-mediated aPDT. CONCLUSIONS The application of aPDT, especially MB-mediated, demonstrated superior SBS, μTBS, and 4P-BS values as well as antibacterial activity against S. mutans as compared to 2% CHX gel and 6% NaOCl as cavity disinfectants for IPC treatment of permanent molars.
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Affiliation(s)
- Hanan AlSunbul
- Department of Restorative Dentistry, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
| | - Afraa Murriky
- Department of Restorative Dentistry, College of Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia
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Piksa M, Lian C, Samuel IC, Pawlik KJ, Samuel IDW, Matczyszyn K. The role of the light source in antimicrobial photodynamic therapy. Chem Soc Rev 2023; 52:1697-1722. [PMID: 36779328 DOI: 10.1039/d0cs01051k] [Citation(s) in RCA: 66] [Impact Index Per Article: 66.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Antimicrobial photodynamic therapy (APDT) is a promising approach to fight the growing problem of antimicrobial resistance that threatens health care, food security and agriculture. APDT uses light to excite a light-activated chemical (photosensitiser), leading to the generation of reactive oxygen species (ROS). Many APDT studies confirm its efficacy in vitro and in vivo against bacteria, fungi, viruses and parasites. However, the development of the field is focused on exploring potential targets and developing new photosensitisers. The role of light, a crucial element for ROS production, has been neglected. What are the main parameters essential for effective photosensitiser activation? Does an optimal light radiant exposure exist? And finally, which light source is best? Many reports have described the promising antibacterial effects of APDT in vitro, however, its application in vivo, especially in clinical settings remains very limited. The restricted availability may partially be due to a lack of standard conditions or protocols, arising from the diversity of selected photosensitising agents (PS), variable testing conditions including light sources used for PS activation and methods of measuring anti-bacterial activity and their effectiveness in treating bacterial infections. We thus sought to systematically review and examine the evidence from existing studies on APDT associated with the light source used. We show how the reduction of pathogens depends on the light source applied, radiant exposure and irradiance of light used, and type of pathogen, and so critically appraise the current state of development of APDT and areas to be addressed in future studies. We anticipate that further standardisation of the experimental conditions will help the field advance, and suggest key optical and biological parameters that should be reported in all APDT studies. More in vivo and clinical studies are needed and are expected to be facilitated by advances in light sources, leading to APDT becoming a sustainable, alternative therapeutic option for bacterial and other microbial infections in the future.
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Affiliation(s)
- Marta Piksa
- Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Science, Weigla 12, 53-114, Wroclaw, Poland
| | - Cheng Lian
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, Fife, KY16 9SS, UK.
| | - Imogen C Samuel
- School of Medicine, University of Manchester, Manchester, M13 9PL, UK
| | - Krzysztof J Pawlik
- Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Science, Weigla 12, 53-114, Wroclaw, Poland
| | - Ifor D W Samuel
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, Fife, KY16 9SS, UK.
| | - Katarzyna Matczyszyn
- Institute of Advanced Materials, Faculty of Chemistry, Wroclaw University of Science and Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland.
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8
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Lin Y, Chen H, Li Z, Lin Y, Liao S, Zeng Y, He J. A comparative evaluation of lasers and photodynamic therapy in the nonsurgical treatment of peri-implant diseases: A Bayesian network meta-analysis. Photodiagnosis Photodyn Ther 2022; 40:103106. [PMID: 36122647 DOI: 10.1016/j.pdpdt.2022.103106] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 09/02/2022] [Indexed: 12/14/2022]
Abstract
PURPOSE We conducted this Bayesian network meta-analysis (NMA) to evaluate the safety and efficacy of different lasers and PDT compared to conventional mechanical debridement (CMD) for peri-implant treatment. METHODS The Web of Science, Cochrane Library and PubMed databases were searched for randomized clinical trials (RCTs) assessing the clinical effectiveness of adjunctive PDT, different lasers, and CMD until January 1st, 2022. Clinical outcomes were the changes in pocket probing depth (PPD), marginal bone loss (MBL), and clinical attachment level (CAL). RESULTS Twenty-three studies, including 4 types of lasers, were included. Compared to that with CMD alone, PPD reduction was significantly more efficient in the diode laser (LD)+CMD groups (MD, 0.53; 95%CI, 0.13-0.93) and the PDT+CMD groups (MD, 0.83; 95%CI, 0.32-1.34) than in the CMD group in the follow-up period. Moreover, PDT+CMD treatment also showed a significantly better marginal bone level gain (MD, 0.32; 95%CI, 0.06-0.57). No significant effect on ΔCAL was observed among the different treatment strategies. Despite no differences in PPD reduction, MBL and CAL gains were found among the adjunctive laser treatment groups, PDT+CMD had the highest ranking probability of the most effective treatment in these clinical indices of periodontitis. The certainty of evidence for all outcomes was judged as very low to moderate. CONCLUSIONS Within the limits of this NMA, we found that adjunctive PDT achieved a small additional benefit on PPD reduction and MBL gain compared with CMD alone and had the highest probability of being ranked first on the changes in PPD, MBL and CAL. PDT+CMD may represent an alternative method for peri‑implant treatment. Further high-quality RCTs are needed to assess the influence of potential confounders on the efficacy of lasers and PDT.
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Affiliation(s)
- Yao Lin
- Jieyang Medical Research Center, Jieyang People's Hospital, Tianfu Road 107 Rongcheng district, Jieyang, Guangdong 522000, PR China
| | - Hongpeng Chen
- Jieyang Medical Research Center, Jieyang People's Hospital, Tianfu Road 107 Rongcheng district, Jieyang, Guangdong 522000, PR China
| | - Zhenxuan Li
- the Department of Stomatology, the Affiliated Hospital of Guangdong Medical University, Zhanjiang, Guangdong, PR China
| | - Yingying Lin
- Jieyang Medical Research Center, Jieyang People's Hospital, Tianfu Road 107 Rongcheng district, Jieyang, Guangdong 522000, PR China
| | - Shuanglin Liao
- The Key Laboratory of Sepsis Translational Medicine, Guangdong Medical University, Zhanjiang, Guangdong, PR China
| | - Yayan Zeng
- Jieyang Medical Research Center, Jieyang People's Hospital, Tianfu Road 107 Rongcheng district, Jieyang, Guangdong 522000, PR China.
| | - Junbing He
- Jieyang Medical Research Center, Jieyang People's Hospital, Tianfu Road 107 Rongcheng district, Jieyang, Guangdong 522000, PR China.
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Solar Heterogenous Photocatalytic Degradation of Methylthionine Chloride on a Flat Plate Reactor: Effect of pH and H2O2 Addition. Catalysts 2022. [DOI: 10.3390/catal12020132] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Methylthionine chloride (MTC) is a compound with several applications both in the clinical and medical industries. Nevertheless, such compounds can become an environmental problem, as they are not properly treated by wastewater treatment plants. This objective of this work was to study MTC degradation in a flat plate reactor through solar photolysis and heterogeneous photocatalysis processes with TiO2 as a catalyst. In addition to the processes, three pH (3.5, 6.5, and 9) and the effect of H2O2 addition (no dose, 0.5, and 1 mM/L) were tested. The results show that acidic pH is the most appropriate for MTC degradation, which ranged between 56% and 68.7% for photolysis and between 76% and 86.7% in photocatalysis. The H2O2 addition resulted in lower degradation in all cases, leading the authors to conclude that the presence of peroxide actually hinders degradation in solar photolysis and photocatalysis processes. Statistical analysis showed that the constant rate reactions calculated for every process, under the same conditions of pH and H2O2 addition, are significantly different from one another, and the three factors considered for experimental design (process, pH, and H2O2) have a statistically significant effect on MTC degradation. The collector area per order confirmed higher efficiency for photocatalysis when compared to photolysis processes.
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Punnoose J, Nachman H, Ashkenazi S. Oxygen Imaging for Non-Invasive Metastasis Detection. SENSORS (BASEL, SWITZERLAND) 2021; 22:s22010237. [PMID: 35009780 PMCID: PMC8749708 DOI: 10.3390/s22010237] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/21/2021] [Accepted: 12/24/2021] [Indexed: 05/16/2023]
Abstract
Sentinel lymph node (SLN) biopsy is an integral part of treatment planning for a variety of cancers as it evaluates whether a tumor has metastasized, an event that significantly reduces survival probability. However, this invasive procedure is associated with patient morbidity, and misses small metastatic deposits, resulting in the removal of additional nodes for tumors with high metastatic probability despite a negative SLN biopsy. To prevent this over-treatment and its associated morbidities for patients that were truly negative, we propose a tissue oxygen imaging method called Photoacoustic Lifetime Imaging (PALI) as an alternative or supplementary tool for SLN biopsy. As the hyper-metabolic state of cancer cells significantly depresses tissue oxygenation compared to normal tissue even for small metastatic deposits, we hypothesize that PALI can sensitively and specifically detect metastases. Before this hypothesis is tested, however, PALI's maximum imaging depth must be evaluated to determine the cancer types for which it is best suited. To evaluate imaging depth, we developed and simulated a phantom composed of tubing in a tissue-mimicking, optically scattering liquid. Our simulation and experimental results both show that PALI's maximum imaging depth is 16 mm. As most lymph nodes are deeper than 16 mm, ways to improve imaging depth, such as directly delivering light to the node using penetrating optical fibers, must be explored.
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Affiliation(s)
- Joshua Punnoose
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, USA;
| | - Henry Nachman
- Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USA;
| | - Shai Ashkenazi
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, USA;
- Correspondence:
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Chen J, Ghosh T, Ayranci C, Tang T. Bio‐cleaned lignin‐based carbon fiber and its application in adsorptive water treatment. J Appl Polym Sci 2021. [DOI: 10.1002/app.52054] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Jiawei Chen
- Department of Mechanical Engineering University of Alberta Edmonton Alberta Canada
| | - Tanushree Ghosh
- Department of Mechanical Engineering University of Alberta Edmonton Alberta Canada
- Center for Earth Sciences Indian Institute of Science Bangalore India
| | - Cagri Ayranci
- Department of Mechanical Engineering University of Alberta Edmonton Alberta Canada
| | - Tian Tang
- Department of Mechanical Engineering University of Alberta Edmonton Alberta Canada
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Kostjukova LO, Leontieva SV, Kostjukov VV. Vibronic absorption spectrum and electronic properties of methylene blue in aqueous solution: TD-DFT study. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116369] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Chen P, Liang Y, Xu Y, Zhao Y, Song S. Synchronous photosensitized degradation of methyl orange and methylene blue in water by visible-light irradiation. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116159] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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14
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Klosowski EM, de Souza BTL, Mito MS, Constantin RP, Mantovanelli GC, Mewes JM, Bizerra PFV, Menezes PVMDC, Gilglioni EH, Utsunomiya KS, Marchiosi R, Dos Santos WD, Filho OF, Caetano W, Pereira PCDS, Gonçalves RS, Constantin J, Ishii-Iwamoto EL, Constantin RP. The photodynamic and direct actions of methylene blue on mitochondrial energy metabolism: A balance of the useful and harmful effects of this photosensitizer. Free Radic Biol Med 2020; 153:34-53. [PMID: 32315767 DOI: 10.1016/j.freeradbiomed.2020.04.015] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 04/13/2020] [Accepted: 04/13/2020] [Indexed: 02/06/2023]
Abstract
According to the literature, methylene blue (MB) is a photosensitizer (PS) with a high affinity for mitochondria. Therefore, several studies have explored this feature to evaluate its photodynamic effects on the mitochondrial apoptotic pathway under normoxic conditions. We are aware only of limited reports regarding MB's photodynamic effects on mitochondrial energy metabolism, especially under hypoxic conditions. Thus, the purposes of this study were to determine the direct and photodynamic acute effects of MB on the energy metabolism of rat liver mitochondria under hypoxic conditions and its direct acute effects on several parameters linked to energy metabolism in the isolated perfused rat liver. MB presented a high affinity for mitochondria, irrespective of photostimulation or proton gradient formation. Upon photostimulation, MB demonstrated high in vitro oxidizing species generation ability. Consequently, MB damaged the mitochondrial macromolecules, as could be evidenced by the elevated levels of lipid peroxidation and protein carbonyls. In addition to generating a pro-oxidant environment, MB also led to a deficient antioxidant defence system, as indicated by the reduced glutathione (GSH) depletion. Bioenergetically, MB caused uncoupling of oxidative phosphorylation and led to photodynamic inactivation of complex I, complex II, and F1FO-ATP synthase complex, thus decreasing mitochondrial ATP generation. Contrary to what is expected for an ideal PS, MB displayed appreciable dark toxicity on mitochondrial energy metabolism. The results indicated that MB acted via at least three mechanisms: direct damage to the inner mitochondrial membrane; uncoupling of oxidative phosphorylation; and inhibition of electron transfer. Confirming the impairment of mitochondrial energy metabolism, MB also strongly inhibited mitochondrial ATP production. In the perfused rat liver, MB stimulated oxygen consumption, decreased the ATP/ADP ratio, inhibited gluconeogenesis and ureogenesis, and stimulated glycogenolysis, glycolysis, and ammoniagenesis, fully corroborating its uncoupling action in intact cells, as well. It can be concluded that even under hypoxic conditions, MB is a PS with potential for photodynamic effect-induced mitochondrial dysfunction. However, MB disrupts the mitochondrial energy metabolism even in the dark, causing energy-linked liver metabolic changes that could be harmful in specific circumstances.
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Affiliation(s)
- Eduardo Makiyama Klosowski
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Byanca Thais Lima de Souza
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Marcio Shigueaki Mito
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Renato Polimeni Constantin
- Department of Biochemistry, Laboratory of Plant Biochemistry, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Gislaine Cristiane Mantovanelli
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Juliana Morais Mewes
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Paulo Francisco Veiga Bizerra
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Paulo Vinicius Moreira da Costa Menezes
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Eduardo Hideo Gilglioni
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Karina Sayuri Utsunomiya
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Rogério Marchiosi
- Department of Biochemistry, Laboratory of Plant Biochemistry, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Wanderley Dantas Dos Santos
- Department of Biochemistry, Laboratory of Plant Biochemistry, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Osvaldo Ferrarese Filho
- Department of Biochemistry, Laboratory of Plant Biochemistry, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Wilker Caetano
- Department of Chemistry, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | | | | | - Jorgete Constantin
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Emy Luiza Ishii-Iwamoto
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
| | - Rodrigo Polimeni Constantin
- Department of Biochemistry, Laboratory of Biological Oxidations and Laboratory of Experimental Steatosis, State University of Maringá, Maringá, 87020-900, Paraná, Brazil.
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Huang TC, Chen CJ, Chen CC, Ding SJ. Enhancing osteoblast functions on biofilm-contaminated titanium alloy by concentration-dependent use of methylene blue-mediated antimicrobial photodynamic therapy. Photodiagnosis Photodyn Ther 2019; 27:7-18. [PMID: 31117001 DOI: 10.1016/j.pdpdt.2019.05.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 04/07/2019] [Accepted: 05/17/2019] [Indexed: 02/06/2023]
Abstract
The concentration of methylene blue (MB) photosensitizer could affect the eradication efficacy of antimicrobial photodynamic therapy (aPDT) in the treatment of contaminated implants, which is linked to the osseointegration of the implant. We evaluated osteoblast functions on the contaminated SLA (sandblasting, large-grit and acid-etching) Ti alloy surfaces after the concentration-dependent use of MB-aPDT. Totally 1164 SLA discs were randomly distributed for the analyses of antibacterial efficacy and osteoblast functions. Gram-negative (Aggregatibacter actinomycetemcomitans; A. actinomycetemcomitans) or Gram-positive (Streptococcus mutans; S. mutans) adhered on disc samples was subjected to aPDT with different MB concentrations (200, 250, 300, 350, and 400 μg/mL) using 660 nm diode laser with maximum output 80 mW for 1 min irradiation (4.8 J/cm2). Bactericidal effect was examined by viability, morphology, and lipopolysaccharide (LPS) assays. The disinfected disc surfaces by MB-aPDT to support osteoblast-like MG63 attachment, proliferation, differentiation, and mineralization were assessed for the predetermined culture time intervals. The statistical differences between the means were performed using a one-way analysis of variance (ANOVA) with a post hoc Scheffe test. The results of the morphology observation and bacterial survival examination consistently indicated a remarkably lower quantity of bacterial colonies on biofilm-contaminated surfaces after the aPDT treatment with higher MB concentration. Similarly, the higher MB concentration in aPDT resulted in the lower LPS amounts remaining on the A. actinomycetemcomitans-contaminated surfaces. Intriguingly, the expression of osteoblast cultured on disinfected surfaces using aPDT with higher MB concentration was comparable to the control without contamination. Within the limits of this in vitro model, this formulation of 400 μg/mL MB used in aPDT may be not only the lethal concentration against the 2 bacteria-contaminated implants, but it could also enhance the osteoblast functions on the contaminated implants. Nevertheless, the efficacy in the clinical practice for peri-implantitis therapy remains to be studied.
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Affiliation(s)
- Tsun-Chin Huang
- Institute of Oral Science, Chung Shan Medical University, Taichung City 402, Taiwan
| | - Chun-Ju Chen
- Institute of Oral Science, Chung Shan Medical University, Taichung City 402, Taiwan
| | - Chun-Cheng Chen
- Department of Stomatology, Chung Shan Medical University Hospital, Taichung City 402, Taiwan; School of Dentistry, Chung Shan Medical University, Taichung City 402, Taiwan.
| | - Shinn-Jyh Ding
- Institute of Oral Science, Chung Shan Medical University, Taichung City 402, Taiwan; Department of Stomatology, Chung Shan Medical University Hospital, Taichung City 402, Taiwan.
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Huang TC, Chen CJ, Ding SJ, Chen CC. Antimicrobial efficacy of methylene blue-mediated photodynamic therapy on titanium alloy surfaces in vitro. Photodiagnosis Photodyn Ther 2018; 25:7-16. [PMID: 30439531 DOI: 10.1016/j.pdpdt.2018.11.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Revised: 11/03/2018] [Accepted: 11/09/2018] [Indexed: 12/18/2022]
Abstract
Bacterial elimination using antimicrobial photodynamic therapy (aPDT) has been considered an alternative therapeutic modality in peri-implantitis treatment. The present in vitro study evaluated the dose-dependent and pH-dependent bactericidal effects of methylene blue (MB)-mediated aPDT at eliminating Gram-negative (P. gingivalis and A. actinomycetemcomitans) and Gram-positive (S. mutans) bacteria on sandblasting, large-grit and acid-etching (SLA)-pretreated titanium alloy. The effects of different MB concentrations (50, 100, and 200 μg/mL), the pH of the MB (4, 7, and 10), and irradiation time (0, 30, and 60 s) on the bacterial viability and residual lipopolysaccharide (LPS) levels were examined. The variations in the pH of the MB solution after aPDT for 60 s on the uncontaminated and contaminated specimens were also detected. The experimental results indicated that MB-mediated PDT could effectively kill the majority of bacteria on the titanium alloy surfaces of biofilm-contaminated implants compared with the MB alone. Of note, aPDT exhibited better antibacterial efficacy with increase in the MB concentration and irradiation time. While treated in an acidic solution on the biofilm-contaminated specimens, aPDT caused the pH to increase. By contrast, the initially high alkaline pH decreased to a value of about pH 8.5 after aPDT. Intriguingly, the neutral pH had minor changes, independent of the MB concentration and bacterial species. As expected, aPDT with higher MB concentration at higher pH environment significantly lowered the LPS concentration of A. actinomycetemcomitans and P. gingivalis. On the basis of the data, the aPDT with 200 μg/mL MB at pH 10 for 60 s of irradiation time might be an effectively treatment to eliminate bacteria and LPS adherent to titanium surface, however, the use of the multispecies biofilm model and the evaluation of in vitro osteogenesis needed to be further evaluated.
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Affiliation(s)
- Tsun-Chin Huang
- Institute of Oral Science, Chung Shan Medical University, Taichung City 402, Taiwan
| | - Chun-Ju Chen
- Institute of Oral Science, Chung Shan Medical University, Taichung City 402, Taiwan
| | - Shinn-Jyh Ding
- Institute of Oral Science, Chung Shan Medical University, Taichung City 402, Taiwan; Department of Stomatology, Chung Shan Medical University Hospital, Taichung City 402, Taiwan.
| | - Chun-Cheng Chen
- Department of Stomatology, Chung Shan Medical University Hospital, Taichung City 402, Taiwan; School of Dentistry, Chung Shan Medical University, Taichung City 402, Taiwan.
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Rodriguez-Serrano A, Daza MC, Doerr M, Tatchen J, Marian CM. Protonation-State-Driven Photophysics in Phenothiazinium Dyes: Intersystem Crossing and Singlet-Oxygen Production. CHEMPHOTOCHEM 2017. [DOI: 10.1002/cptc.201700069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Angela Rodriguez-Serrano
- Max-Planck-Institut für Kohlenforschung; Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
- Grupo de Bioquímica Teórica; Universidad Industrial de Santander; Carrera 27, Calle 9 Bucaramanga Colombia
| | - Martha C. Daza
- Grupo de Bioquímica Teórica; Universidad Industrial de Santander; Carrera 27, Calle 9 Bucaramanga Colombia
| | - Markus Doerr
- Grupo de Bioquímica Teórica; Universidad Industrial de Santander; Carrera 27, Calle 9 Bucaramanga Colombia
| | - Jörg Tatchen
- Max-Planck-Institut für Kohlenforschung; Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
| | - Christel M. Marian
- Institute of Theoretical and Computational Chemistry; Heinrich Heine University Düsseldorf; Universitätsstr. 1 40225 Düsseldorf Germany
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Singh M, Pakshirajan K, Trivedi V. Photo-inactivation of Escherichia coli and Enterococcus hirae using methylene blue and sodium anthraquinone-2-sulphonate: effect of process parameters. 3 Biotech 2016; 6:176. [PMID: 28330248 PMCID: PMC4992475 DOI: 10.1007/s13205-016-0487-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 08/02/2016] [Indexed: 11/29/2022] Open
Abstract
In this study, effect of different parameters, viz. concentration of photosensitizer (PS), pH of the bacterial cell suspension and initial cell count, on photo-inactivation of Escherichia coli and Enterococcus hirae bacteria using methylene blue (MB) and sodium anthraquinone-2-sulphonate (SAQS) was investigated employing the statistically valid full factorial design of experiments. The inactivation efficiency of E. hirae using MB ranges between 10.81 and 48.55 %, whereas in the case of E. coli it ranges between 10.41 and 46.44 %. Using SAQS, the inactivation efficiency of E. hirae was within 5.26–39.03 %, and in the case of E. coli it varied in the range 4.65–37.66 %. Statistical analysis of the photo-inactivation results in the form of analysis of variance (ANOVA) and student ‘t’ test revealed significant individual effect of these process parameters. In addition, an increase in dark incubation period with MB or SAQS resulted in enhanced photo-inactivation efficiency against both the microorganisms. Reactive oxygen species measurement and analysis of lipid peroxidation and protein carbonyl index helped in a better understanding of the photo-inactivation mechanism.
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Affiliation(s)
- Madhavi Singh
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - Kannan Pakshirajan
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
| | - Vishal Trivedi
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
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Effect of fiber insertion depth on antibacterial efficacy of photodynamic therapy against Enterococcus faecalis in rootcanals. Clin Oral Investig 2016; 21:1753-1759. [PMID: 27591860 DOI: 10.1007/s00784-016-1948-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 08/30/2016] [Indexed: 10/21/2022]
Abstract
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). Samples were taken by collecting standardized dentine shavings from the root canal walls. After serial dilution and culturing on blood agar, colony-forming units (CFU) were counted. RESULTS Both aPDT groups showed a CFU reduction of 1-2 log10 steps compared with the infection control, whereas the effect of fiber insertion depth was negligible (<0.5 log10 steps). CFU reduction of approximately 0.5 log10 steps for PS alone was detected compared with the infection control, but PS alone was less effective than both aPDT groups. No antibacterial effect was detected for LED alone. CONCLUSIONS aPDT reduced E. faecalis within the root canal, whereas fiber insertion depth had a negligible influence on antimicrobial effectiveness of aPDT. CLINICAL RELEVANCE The insertion depth of the light-emitting diode may not influence the antibacterial efficacy of photodynamic therapy against E. faecalis in straight root canals.
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Dean JC, Oblinsky DG, Rather SR, Scholes GD. Methylene Blue Exciton States Steer Nonradiative Relaxation: Ultrafast Spectroscopy of Methylene Blue Dimer. J Phys Chem B 2016; 120:440-54. [PMID: 26781668 DOI: 10.1021/acs.jpcb.5b11847] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The photochemistry and aggregation properties of methylene blue (MB) lead to its popular use in photodynamic therapy. The facile formation of strongly coupled "face-to-face" H-aggregates in concentrated aqueous solution, however, significantly changes its spectroscopic properties and photophysics. The photoinitiated dynamics of the simplest MB aggregate, MB2, was investigated over femtosecond to nanosecond time scales revealing sequential internal conversion events that fully relax the excited population. MB monomer dynamics were analyzed in tandem for a direct comparison. First, ultrafast internal conversion from the electric-dipole allowed upper exciton state to the lower forbidden exciton state was evaluated by use of broadband transient absorption (BBTA) and two-dimensional electronic spectroscopy (2DES) with a time resolution of ∼ 10 fs. Lineshape analysis of MB and MB2 2DES bands at 298 and 77 K show effectively no difference in the diagonal/antidiagonal line width ratio for the dimer, in marked contrast to the distinct reduction of the homogeneous line width for MB. This result is interpreted as ultrafast population relaxation imposing a limitation to the homogeneous line width, instead of pure dephasing as in the case of the monomer. Narrowband transient absorption was performed with the aid of target analysis, to model the dynamics at longer times. The MB dynamics were described by a sequential model featuring vibrational relaxation (1-10 ps) followed by intersystem crossing and internal conversion (τ ∼ 370 ps) leaving behind MB triplet species. Alternatively, the dimer dynamics were entirely quenched within ∼ 10 ps, yielding a ground state recovery time of 3-4 ps. Such fast and complete relaxation to the ground state demonstrates the effect of concentration quenching when monomers are brought into close proximity. The formation of exciton states introduces an initial energy funnel that eventually leads to population relaxation to the ground state, preventing even the dissociation of dimers despite having internal energies well above its binding energy.
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Affiliation(s)
- Jacob C Dean
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
| | - Daniel G Oblinsky
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
| | - Shahnawaz R. Rather
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
| | - Gregory D Scholes
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
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Gollmer A, Felgenträger A, Bäumler W, Maisch T, Späth A. A novel set of symmetric methylene blue derivatives exhibits effective bacteria photokilling – a structure–response study. Photochem Photobiol Sci 2015; 14:335-51. [DOI: 10.1039/c4pp00309h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This study focuses on the structure–response relationship of symmetrically substituted phenothiazinium dyes.
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Affiliation(s)
- Anita Gollmer
- Department of Dermatology
- University Medical Center Regensburg
- Germany
| | | | - Wolfgang Bäumler
- Department of Dermatology
- University Medical Center Regensburg
- Germany
| | - Tim Maisch
- Department of Dermatology
- University Medical Center Regensburg
- Germany
| | - Andreas Späth
- Department of Organic Chemistry
- University of Regensburg
- Germany
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22
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Chen J, Cesario TC, Li R, Er AO, Rentzepis PM. The low photo-inactivation rate of bacteria in human plasma II. Inhibition of methylene blue bleaching in plasma and effective bacterial destruction by the addition of dilute acetic acid to human plasma. Photochem Photobiol Sci 2015. [DOI: 10.1039/c5pp00042d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Bacteria in human plasma resist methylene blue photo-inactivation. The addition of dilute acetic acid prevents MB bleaching and restores the efficient destruction of bacteria.
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Affiliation(s)
- Jie Chen
- Key Laboratory for Laser Plasmas (Ministry of Education)
- Department of Physics and Astronomy and IFSA Collaborative Innovation Center
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | | | - Runze Li
- Electrical & Computer Engineering
- Texas A&M University
- College Station
- USA
| | - Ali O. Er
- Department of Physics and Astronomy
- Western Kentucky University
- Bowling Green
- USA
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23
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Rationale and mechanism for the low photoinactivation rate of bacteria in plasma. Proc Natl Acad Sci U S A 2013; 111:33-8. [PMID: 24368851 DOI: 10.1073/pnas.1315053111] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The rate of bacterial photoinactivation in plasma by methylene blue (MB), especially for Gram-negative bacteria, has been reported to be lower, by about an order of magnitude, than the rate of inactivation in PBS and water solutions. This low inactivation rate we attribute to the bleaching of the 660-nm absorption band of MB in plasma that results in low yields of MB triplet states and consequently low singlet oxygen generation. We have recorded the change of the MB 660-nm-band optical density in plasma, albumin, and cysteine solutions, as a function of time, after 661-nm excitation. The transient triplet spectra were recorded and the singlet oxygen generated in these solutions was determined by the rate of decrease in the intensity of the 399-nm absorption band of 9, 10-anthracene dipropionic acid. We attribute the bleaching of MB, low singlet oxygen yield, and consequently the low inactivation rate of bacteria in plasma to the attachment of a hydrogen atom, from the S-H group of cysteine, to the central nitrogen atom of MB and formation of cysteine dimer.
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Hydrogen bond acceptors and additional cationic charges in methylene blue derivatives: photophysics and antimicrobial efficiency. BIOMED RESEARCH INTERNATIONAL 2012; 2013:482167. [PMID: 23509728 PMCID: PMC3591237 DOI: 10.1155/2013/482167] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2012] [Accepted: 09/21/2012] [Indexed: 01/04/2023]
Abstract
Photodynamic inactivation of bacteria (PIB) by efficient singlet oxygen photosensitizers might be a beneficial alternative to antibiotics in the struggle against multiresistant bacteria. Phenothiazinium dyes belong to the most prominent classes of such sensitizers due to their intense absorption in the red-light region (λabs, max ca. 600–680 nm, ε > 50000 L mol−1 cm−1), their low toxicity, and their attachment/penetration abilities. Except simple substituents like alkyl or hydroxyalkyl residues, nearly no modifications of the phenothiaziniums have been pursued at the auxochromic sites. By this, the properties of methylene blue derivatives and their fields of application are limited; it remains unclear if their potential antimicrobial efficacy may be enhanced, also to compete with porphyrins. We prepared a set of six mainly novel methylene blue derivatives with the ability of additional hydrogen bonding and/or additional cationic charges to study the substituents' effect on their activity/toxicity profiles and photophysical properties. Direct detection of singlet oxygen was performed at 1270 nm and the singlet oxygen quantum yields were determined. In suspensions with both, Gram-positive and Gram-negative bacteria, some derivatives were highly active upon illumination to inactivate S. aureus and E. coli up to 7 log10 steps (99.99999%) without inherent toxicities in the nonirradiated state.
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Harper JC, Brozik SM, Brinker CJ, Kaehr B. Biocompatible microfabrication of 3D isolation chambers for targeted confinement of individual cells and their progeny. Anal Chem 2012; 84:8985-9. [PMID: 23072333 DOI: 10.1021/ac301816c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We describe a technique to physically isolate single/individual cells from their surrounding environment by fabricating three-dimensional microchambers around selected cells under biocompatible conditions. Isolation of targeted cells is achieved via rapid fabrication of protein hydrogels from a biocompatible precursor solution using multiphoton lithography, an intrinsically 3D laser direct write microfabrication technique. Cells remain chemically accessible to environmental cues enabling their propagation into well-defined, high density populations. We demonstrate this methodology on gram negative (E. coli), gram positive (S. aureus), and eukaryotic (S. cerevisiae) cells. The opportunities to confine viable, single/individual-cells and small populations within user-defined microenvironments afforded by this approach should facilitate the study of cell behaviors across multiple generations.
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Affiliation(s)
- Jason C Harper
- Sandia National Laboratories, Albuquerque, New Mexico 87131, United States
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26
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Oguz Er A, Chen J, Cesario TC, Rentzepis PM. Inactivation of bacteria in plasma. Photochem Photobiol Sci 2012; 11:1700-4. [DOI: 10.1039/c2pp25135c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Research Spotlight: Accurate delivery of chemicals and intense light on infected areas only for targeted therapy inside the body. Ther Deliv 2011; 2:1241-5. [DOI: 10.4155/tde.11.96] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Bacteria and virus deactivation is performed inside and on the skin of the body using the novel device described in this paper. This device delivers on the infected spot only the needed amount of drug and light necessary for therapy, while the excess is siphoned out, thus eliminating the deleterious affects that maybe caused by intravenous injection. A charged coupled device provides means for visual monitoring of the therapeutic reaction and an LED or laser diode supplies the intense light for the photochemical deactivation. The spectra and kinetics of the photochemical reaction that generate the reactive species, such as 1O2 and OH radicals that are responsible for pathogen deactivation, are presented. Topical therapy experiments on New Zealand rabbits are described.
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