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https://www.readbyqxmd.com/read/28431928/cisplatin-and-photodynamic-therapy-exert-synergistic-inhibitory-effects-on-small-cell-lung-cancer-cell-viability-and-xenograft-tumor-growth
#1
You-Shuang Chen, Yin-Bo Peng, Min Yao, Ji-Ping Teng, Da Ni, Zhi-Jun Zhu, Bu-Feng Zhuang, Zhi-Yin Yang
Lung cancer is the leading cause of cancer death worldwide. Small-cell lung cancer (SCLC) is an aggressive type of lung cancer that shows an overall 5-year survival rate below 10%. Although chemotherapy using cisplatin has been proven effective in SCLC treatment, conventional dose of cisplatin causes adverse side effects. Photodynamic therapy, a form of non-ionizing radiation therapy, is increasingly used alone or in combination with other therapeutics in cancer treatment. Herein, we aimed to address whether low dose cisplatin combination with PDT can effectively induce SCLC cell death by using in vitro cultured human SCLC NCI-H446 cells and in vivo tumor xenograft model...
April 18, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28430624/photosensitizers-in-prostate-cancer-therapy
#2
REVIEW
Taher Gheewala, Troy Skwor, Gnanasekar Munirathinam
The search for new therapeutics for the treatment of prostate cancer is ongoing with a focus on the balance between the harms and benefits of treatment. New therapies are being constantly developed to offer treatments similar to radical therapies, with limited side effects. Photodynamic therapy (PDT) is a promising strategy in delivering focal treatment in primary as well as post radiotherapy prostate cancer. PDT involves activation of a photosensitizer (PS) by appropriate wavelength of light, generating transient levels of reactive oxygen species (ROS)...
February 18, 2017: Oncotarget
https://www.readbyqxmd.com/read/28428778/evidence-for-nitric-oxide-synthase-activity-in-staphylococcus-xylosus-mediating-nitrosoheme-formation
#3
Geoffrey Ras, Véronique Zuliani, Patrick Derkx, Tim M Seibert, Sabine Leroy, Régine Talon
Staphylococcus xylosus is used as a starter culture in fermented meat products and contributes to color formation by the reduction of nitrate to nitrite. Nitrite is a food additive that is chemically turned to nitric oxide (NO) in meat but its safety has been questioned. The objective of this study was to determine the ability of NO synthase (NOS) of S. xylosus C2a to produce NO. For this purpose, a nos deletion mutant (Δnos) in S. xylosus was constructed and NO production was evaluated in a test based on its ability to form nitrosomyoglobin and nitrosoheme...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28426936/cholesterol-assisted-bacterial-cell-surface-engineering-for-photodynamic-inactivation-of-gram-positive-and-gram-negative-bacteria
#4
Hao-Ran Jia, Ya-Xuan Zhu, Zhan Chen, Fu-Gen Wu
Antibacterial photodynamic therapy (PDT) which enables effective killing of regular and multidrug-resistant (MDR) bacteria is a promising treatment modality for bacterial infection. However, because most photosensitizer (PS) molecules fail to strongly interact with the surface of Gram-negative bacteria, this technique is only suitable for treating Gram-positive bacterial infection, which largely hampers its practical applications. Herein, we revealed for the first time that cholesterol could significantly facilitate the hydrophobic binding of PSs to the bacterial surface, achieving the hydrophobic interaction-based bacterial cell surface engineering that could effectively photo-inactivate both Gram-negative and Gram-positive bacteria...
April 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28426148/three-dimensional-finite-element-based-deformable-image-registration-for-evaluation-of-pleural-cavity-irradiation-during-photodynamic-therapy
#5
Rozhin Penjweini, Michele M Kim, Timothy C Zhu
PURPOSE: Photodynamic therapy (PDT) is used after surgical resection to treat the microscopic disease for malignant pleural mesothelioma and to increase survival rates. As accurate light delivery is imperative to PDT efficacy, the deformation of the pleural volume during the surgery is studied on its impact on the delivered light fluence. In this study, a three-dimensional finite element-based (3D FEM) deformable image registration is proposed to directly match the volume of lung to the volume of pleural cavity obtained during PDT to have accurate representation of the light fluence accumulated in the lung, heart and liver (organs-at-risk) during treatment...
April 20, 2017: Medical Physics
https://www.readbyqxmd.com/read/28423634/early-assessment-of-tumor-response-to-photodynamic-therapy-using-combined-diffuse-optical-and-diffuse-correlation-spectroscopy-to-predict-treatment-outcome
#6
Patricia Thong, Kijoon Lee, Hui-Jin Toh, Jing Dong, Chuan-Sia Tee, Kar-Perng Low, Pui-Haan Chang, Ramaswamy Bhuvaneswari, Ngian-Chye Tan, Khee-Chee Soo
Photodynamic therapy (PDT) of cancer involves the use of a photosensitizer that can be light-activated to eradicate tumors via direct cytotoxicity, damage to tumor vasculature and stimulating the body's immune system. Treatment outcome may vary between individuals even under the same regime; therefore a non-invasive tumor response monitoring system will be useful for personalization of the treatment protocol. We present the combined use of diffuse optical spectroscopy (DOS) and diffuse correlation spectroscopy (DCS) to provide early assessment of tumor response...
March 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28420599/use-of-machine-learning-classifiers-and-sensor-data-to-detect-neurological-deficit-in-stroke-patients
#7
Eunjeong Park, Hyuk-Jae Chang, Hyo Suk Nam
BACKGROUND: The pronator drift test (PDT), a neurological examination, is widely used in clinics to measure motor weakness of stroke patients. OBJECTIVE: The aim of this study was to develop a PDT tool with machine learning classifiers to detect stroke symptoms based on quantification of proximal arm weakness using inertial sensors and signal processing. METHODS: We extracted features of drift and pronation from accelerometer signals of wearable devices on the inner wrists of 16 stroke patients and 10 healthy controls...
April 18, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/28420143/biotinylated-chlorin-and-its-zinc-and-indium-complexes-synthesis-and-in-vitro-biological-evaluation-for-photodynamic-therapy
#8
Meden F Isaac-Lam, Dewana M Hammonds
The synthesis and characterization of biotinylated chlorin photosensitizer and the corresponding zinc and indium complexes are described for potential applications in photodynamic therapy (PDT) for cancer. Phototoxicity of the biotin-chlorin conjugate and the metallated complexes was determined in colon carcinoma CT26 cell lines known to overexpress biotin (Vit B₇) receptors. Cell survival assay indicated that the biotinylated chlorin and indium complex showed increased cell growth inhibition than the zinc complex and the starting chlorin (methyl pheophorbide)...
April 15, 2017: Pharmaceuticals
https://www.readbyqxmd.com/read/28419399/low-fluence-photodynamic-therapy-versus-graded-subthreshold-transpupillary-thermotherapy-for-chronic-central-serous-chorioretinopathy-results-from-a-prospective-study
#9
George J Manayath, Smita S Karandikar, Siddharth Narendran, Karan A Kumarswamy, V R Saravanan, Rodney J Morris, Narendran Venkatapathy
BACKGROUND AND OBJECTIVE: The authors compare low fluence photodynamic therapy (PDT) against graded subthreshold transpupillary thermotherapy (TTT) for chronic central serous chorioretinopathy (CSC). PATIENTS AND METHODS: Forty-two eyes of 42 patients with chronic CSC were included in this prospective, nonrandomized, interventional trial. All patients were offered PDT as an initial intervention. If they declined PDT, TTT was offered. RESULTS: Twenty patients underwent PDT and 22 underwent TTT...
April 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28419395/choriocapillaris-changes-imaged-by-oct-angiography-after-half-dose-photodynamic-therapy-for-chronic-central-serous-chorioretinopathy
#10
Kyoko Fujita, Akiyuki Kawamura, Mitsuko Yuzawa
BACKGROUND AND OBJECTIVE: To evaluate the choriocapillaris using optical coherence tomographic angiography (OCTA) after half-dose verteporfin photodynamic therapy (hd-PDT) for chronic central serous chorioretinopathy (CSC). PATIENTS AND METHODS: We studied six eyes (six patients) with chronic CSC treated by hd-PDT. OCTA was performed before, 1 week after, and 1 month after hd-PDT. The area of flow abnormality at the choriocapillaris level within the PDT spot after hd-PDT was compared with that before hd-PDT...
April 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28418855/a-review-and-outlook-in-the-treatment-of-osteosarcoma-and-other-deep-tumors-with-photodynamic-therapy-from-basic-to-deep
#11
REVIEW
Wei Yu, Jian Zhu, Yitian Wang, Junjie Wang, Weijing Fang, Kaishun Xia, Jianlin Shao, Minzu Wu, Bing Liu, Chengzhen Liang, Chengyi Ye, Huimin Tao
Photodynamic therapy, one of the most promising minimally invasive treatments, has received increasing focus in tumor therapy research, which has been widely applied in treating superficial tumors. Three basic factors - photosensitizer, the light source, and oxidative stress - are responsible for tumor cell cytotoxicity. However, due to insufficient luminous flux and peripheral tissue damage, the utilization of photodynamic therapy is facing a huge limitation in deep tumor therapy. Osteosarcoma is the typical deep tumor, which is the most commonly occurring malignancy in children and adolescents...
March 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28417552/enhanced-phototoxicity-of-photodynamic-treatment-by-cx26-composed-gjic-via-ros-calcium-and-lipid-peroxide-mediated-pathways
#12
Deng-Pan Wu, Tian-Yu Lin, Li-Ru Bai, Jin-Lan Huang, Yan Zhou, Nan Zhou, Sheng-Lei Zhong, Shan Gao, Xiao-Xing Yin
In spite of the promising initial treatment responses presented by photodynamic therapy (PDT), 5-year recurrence rates remain high level. Therefore, improvement in the efficacy of PDT is needed. There are reports showing that connexin(Cx) 26-composed gap junctional intercellular communication (GJIC) enhances the intercellular propagation of "death signal", thereby increasing chemotherapeutic cytotoxicity. However, it is unclear whether Cx26-formed GJIC has an effect on PDT phototoxicity. The results in the present study showed that Cx26-composed GJ formation at high density enhances the phototoxicity of Photofrin-PDT...
April 18, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28416605/photodynamic-therapy-using-photosensitizer-encapsulated-polymeric-nanoparticle-to-overcome-atp-binding-cassette-transporter-subfamily-g2-function-in-pancreatic-cancer
#13
Yoon Jin Roh, Ju Hee Kim, In-Wook Kim, Kun Na, Jae Myung Park, Myung-Gyu Choi
Chlorin-based photosensitizers are commonly used in photodynamic therapy (PDT).  These drugs are effluxed by cell-membrane transporters, such as the ATP-binding cassette subfamily G member 2 (ABCG2). PDT efficacy is limited in tumor cells expressing high levels of these proteins. Pancreatic cancer cell lines AsPC-1 and MIA PaCa-2, which have high and low ABCG2 expression, respectively, were used and ABCG2-overexpressing MIA PaCa-2 cells were generated. We compared PDT efficacy between Chlorin e6 (Ce6) and cationic photosensitizer-encapsulated polymeric nanoparticle (PS-pNP) which is comprised with Ce6, polyethylene glycol and polyethylenimine...
April 17, 2017: Molecular Cancer Therapeutics
https://www.readbyqxmd.com/read/28411862/photodynamic-therapy-with-methylene-blue-worth-considering-for-skin-ulcers-infected-with-pseudomonas-aeruginosa-and-fusarium-spp
#14
C Aspiroz, M Sevil, C Toyas, Y Gilaberte
Photodynamic therapy (PDT) is a therapeutic modality with significant antimicrobial activity. We present 2 cases of chronic lower limb ulcers in which fungal and bacterial superinfection complicated management. PDT with methylene blue as the photosensitizer led to clinical and microbiological cure with no significant adverse effects. PDT with methylene blue is a valid option for the management of superinfected chronic ulcers, reducing the use of antibiotics and the induction of resistance.
April 12, 2017: Actas Dermo-sifiliográficas
https://www.readbyqxmd.com/read/28406719/structured-expert-consensus-on-actinic-keratosis-treatment-algorithm-focusing-on-daylight-pdt
#15
Piergiacomo Calzavara-Pinton, Merete Hædersdal, Kirk Barber, Nicole Basset-Seguin, María Emilia Del Pino Flores, Peter Foley, Gaston Galimberti, Rianne Gerritsen, Yolanda Gilarbete, Sally Ibbotson, Ketty Peris, Sheetal Sapra, Eleni Sotiriou, Luis Torezan, Claas Ulrich, Jonathan Guillemot, Janek Hendrich, Rolf-Markus Szeimies
BACKGROUND: A practical and up-to-date consensus among experts is paramount to further improve patient care in actinic keratosis (AK). OBJECTIVES: To develop a structured consensus statement on the diagnosis, classification, and practical management of AK based on up-to-date information. METHODS: A systematic review of AK clinical guidelines was conducted. This informed the preparation of a 3-round Delphi procedure followed by a consensus meeting, which combined the opinions of 16 clinical experts from 13 countries, to construct a structured consensus statement and a treatment algorithm positioning daylight photodynamic therapy (dl-PDT) among other AK treatment options...
April 1, 2017: Journal of Cutaneous Medicine and Surgery
https://www.readbyqxmd.com/read/28405328/photodynamic-therapy-with-polyhematoporphyrin-for-malignant-biliary-obstruction-a-nationwide-retrospective-study-of-150-consecutive-applications
#16
Werner Dolak, Hubert Schwaighofer, Brigitte Hellmich, Bernhard Stadler, Georg Spaun, Wolfgang Plieschnegger, Arnold Hebenstreit, Jutta Weber-Eibel, Franz Siebert, Klaus Emmanuel, Peter Knoflach, Michael Gschwantler, Wolfgang Vogel, Michael Trauner, Andreas Püspök
BACKGROUND: Photodynamic therapy (PDT) is a palliative treatment for malignant biliary obstruction. OBJECTIVE: The objective of this article is to assess the feasibility and safety of this technique. METHODS: In this nationwide, retrospective study of prospectively collected clinical data, all patients treated with PDT using polyhematoporphyrin in Austria from March 2004 to May 2013 were included. Feasibility, adverse events, stent patency and mortality rates were investigated...
February 2017: United European Gastroenterology Journal
https://www.readbyqxmd.com/read/28403266/laser-assisted-photodynamic-therapy-two-novel-protocols-for-enhanced-treatment-results
#17
Mary L Stevenson, Julie K Karen, Elizabeth K Hale
<p>Photodynamic therapy (PDT) uses a topical photosensitizing agent which is activated by a light source to cause destruction of specific cells. Commonly used for the treatment of actinic keratoses and photodamage, PDT can also be used for other conditions including acne and sebaceous hyperplasia. Here we report our experience with two treatment protocols. The first protocol utilizes laser assisted delivery of topical 5-aminolevulinic acid for enhanced efficacy of blue light photodynamic therapy in the treatment of actinic keratoses and photodamage...
April 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28400524/women-s-healthcare-consultations-on-operations-a-multidisciplinary-provider-questionnaire
#18
Magdalena Thiel, S Evans, R Sawdy
BACKGROUND: 30% of UK primary care consultations relate to gynaecology. Servicewomen access healthcare in general more frequently than their NHS counterparts, so military medical professionals are thus more likely to be managing significant numbers of gynaecological conditions on deployed military operations. Little is known about their confidence and preparedness in managing female-specific complaints. This study aimed to assess clinicians' views as to their training and confidence in managing gynaecological conditions; to gauge the need for developing treatment guidelines and specific training opportunities and to establish the frequency and scope of female-specific presentations on a military deployment...
April 11, 2017: Journal of the Royal Army Medical Corps
https://www.readbyqxmd.com/read/28394858/randomized-controlled-trial-of-fractional-carbon-dioxide-laser-resurfacing-followed-by-ultrashort-incubation-aminolevulinic-acid-blue-light-photodynamic-therapy-for-actinic-keratosis
#19
Macrene Alexiades
BACKGROUND: Aminolevulinic acid (ALA) photodynamic therapy (PDT) is an established treatment option for actinic keratosis (AK), and recently fractional carbon dioxide (CO2) laser was shown to improve outcomes; but studies of short incubation photosensitizer are lacking. OBJECTIVE: Assess the efficacy of short incubation ALA followed by blue light PDT with and without previous fractional CO2 treatment for the treatment of AK. METHODS: Randomized, paired split-design, controlled trial of fractional CO2 followed by ultrashort 15-minute versus 30-minute incubation ALA and blue light PDT for the treatment of AK on the face...
April 6, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28393033/combined-photodynamic-therapy-and-ranibizumab-for-polypoidal-choroidal-vasculopathy-a-2-year-result-and-systematic-review
#20
Meng Zhao, Hai-Ying Zhou, Jun Xu, Feng Zhang, Wen-Bin Wei, Ning-Pu Liu
AIM: To report a cohort of patients with polypoidal choroidal vasculopathy (PCV) treated with photodynamic therapy (PDT) followed by intravitreal ranibizumab injection 24-48h later, and to compare the results between eyes with PCV treated by PDT followed by intravitreal anti-vascular endothelial growth factor (VEGF) injection and intravitreal anti-VEGF injection followed by PDT by Meta-analysis. METHODS: Retrospective study and systematic literature review. Medical records of patients with PCV who were initially treated using PDT followed by intravitreal ranibizumab injection 24-48h after PDT and had completed at least 2y follow-up were reviewed and analyzed...
2017: International Journal of Ophthalmology
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