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https://www.readbyqxmd.com/read/29218493/direct-biological-effects-of-fractional-ultrapulsed-co2-laser-irradiation-on-keratinocytes-and-fibroblasts-in-human-organotypic-full-thickness-3d-skin-models
#1
L Schmitt, S Huth, P M Amann, Y Marquardt, R Heise, K Fietkau, L Huth, T Steiner, F Hölzle, J M Baron
Molecular effects of various ablative and non-ablative laser treatments on human skin cells-especially primary effects on epidermal keratinocytes and dermal fibroblasts-are not yet fully understood. We present the first study addressing molecular effects of fractional non-sequential ultrapulsed CO2 laser treatment using a 3D skin model that allows standardized investigations of time-dependent molecular changes ex vivo. While histological examination was performed to assess morphological changes, we utilized gene expression profiling using microarray and qRT-PCR analyses to identify molecular effects of laser treatment...
December 7, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29214660/thulium-laser-assisted-endoscopic-third-ventriculostomy-determining-safe-laser-settings-using-in-vitro-model-and-2-year-follow-up-results-in-106-patients
#2
Tjeerd de Boorder, Hans B Brouwers, Herke Jan Noordmans, Peter A Woerdeman, Kuo S Han, Rudolf M Verdaasdonk
BACKGROUND AND OBJECTIVE: Endoscopic third ventriculostomy is used to treat hydrocephalus. Different laser wavelengths have been proposed for laser-assisted endoscopic third ventriculostomies over the last decades. The aim of this study was to evaluate Thulium laser endoscopic third ventriculostomy heat penetration in the surrounding environment of the floor of the third ventricle in an in vitro setting with visualization of thermal distribution. Subsequently 106 Thulium laser endoscopic third ventriculostomy procedures were retrospectively analyzed to demonstrate safety...
December 7, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29207593/deregulated-c-myc-requires-a-functional-hsf1-for-experimental-and-human-hepatocarcinogenesis
#3
Antonio Cigliano, Maria G Pilo, Lei Li, Gavinella Latte, Marta Szydlowska, Maria M Simile, Panagiotis Paliogiannis, Li Che, Giovanni M Pes, Giuseppe Palmieri, Maria C Sini, Antonio Cossu, Alberto Porcu, Gianpaolo Vidili, Maria A Seddaiu, Rosa M Pascale, Silvia Ribback, Frank Dombrowski, Xin Chen, Diego F Calvisi
Deregulated activity of the c-Myc protooncogene is a frequent molecular event underlying mouse and human hepatocarcinogenesis. Nonetheless, the mechanisms sustaining c-Myc oncogenic activity in liver cancer remain scarcely delineated. Recently, we showed that the mammalian target of rapamycin complex 1 (mTORC1) cascade is induced and necessary for c-Myc dependent liver tumor development and progression. Since the heat shock factor 1 (HSF1) transcription factor is a major positive regulator of mTORC1 in the cell, we investigated the functional interaction between HSF1 and c-Myc using in vitro and in vivo approaches...
October 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/29201060/osteogenic-differentiation-of-hdpscs-on-biogenic-bone-apatite-thin-films
#4
Michele Bianchi, Alessandra Pisciotta, Laura Bertoni, Matteo Berni, Alessandro Gambardella, Andrea Visani, Alessandro Russo, Anto de Pol, Gianluca Carnevale
A previous study reported the structural characterization of biogenic apatite (BAp) thin films realized by a pulsed electron deposition system by ablation of deproteinized bovine bone. Thin films annealed at 400°C exhibited composition and crystallinity degree very close to those of biogenic apatite; this affinity is crucial for obtaining faster osseointegration compared to conventional, thick hydroxyapatite (HA) coatings, for both orthopedics and dentistry. Here, we investigated the adhesion, proliferation, and osteogenic differentiation of human dental pulp stem cells (hDPCS) on as-deposited and heat-treated BAp and stoichiometric HA...
2017: Stem Cells International
https://www.readbyqxmd.com/read/29195356/a-new-instrument-of-vuv-laser-desorption-ionization-mass-spectrometry-imaging-with-micrometer-spatial-resolution-and-low-level-of-molecular-fragmentation
#5
Jia Wang, Feng Liu, Yuxiang Mo, Zhaoying Wang, Sichun Zhang, Xinrong Zhang
Mass spectrometry imaging (MSI) has important applications in material research, biology, and medicine. The MSI method based on UV laser desorption/ionization (UVLDI) can obtain images of intact samples, but has a high level of molecular fragmentation. In this work, we report a new MSI instrument that uses a VUV laser (125.3 nm) as a desorption/ionization source to exploit its advantages of high single photon energy and small focus size. The new instrument was tested by the mass spectra of Nile red and FGB (Fibrinogen beta chain) samples and mass spectrometric images of a fly brain section...
November 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29195341/the-effect-of-laser-wavelength-on-the-delay-time-of-laser-triggered-vacuum-switch
#6
Yinan Xin, Zhenghao He, Yuchen Liu
The study on the influence of laser wavelength on the initial plasma properties of laser-triggered vacuum switch (LTVS) is not only beneficial to understanding the trigger mechanism but also to optimizing its design for miniaturization and generalization. In this paper, the one-dimensional heat conduction model of the target was developed and then the effect of laser wavelength on the depth of laser ablation and the quantity of initial plasma were investigated experimentally and theoretically with the laser absorption rate...
November 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29193279/numerical-and-experimental-evaluation-of-high-intensity-focused-ultrasound-induced-lesions-in-liver-tissue-ex-vivo
#7
Samaneh Haddadi, Mohammad Taghi Ahmadian
OBJECTIVES: Recent advances in the field of acoustics and piezoelectric and ultrasound transducers have led to new approaches to the diagnosis and treatment of certain diseases. One method of treatment with ultrasonic waves is high-intensity focused ultrasound (HIFU) treatment, which is a thermal therapeutic method used to treat malignant tumors. Although a variety of treatment-planning strategies using ultrasonic waves have been investigated, little clinical success has been achieved...
November 30, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29193144/simulating-thermal-effects-of-mr-guided-focused-ultrasound-in-cortical-bone-and-its-surrounding-tissue
#8
Thomas J Hudson, Thomas Looi, Samuel Pichardo, Joao Amaral, Michael Temple, James M Drake, Adam C Waspe
PURPOSE: Magnetic resonance guided focused ultrasound (MRgFUS) is emerging as a treatment alternative for osteoid osteoma and painful bone metastases. This study describes a new simulation platform that predicts the distribution of heat generated by MRgFUS when applied to bone tissue. METHODS: Calculation of the temperature distribution was performed using two mathematical models. The first determined the propagation and absorption of acoustic energy through each medium, and this was performed using a multi-layered approximation of the Rayleigh integral...
November 28, 2017: Medical Physics
https://www.readbyqxmd.com/read/29180835/laminated-and-infused-parafilm%C3%A2-paper-for-paper-based-analytical-devices
#9
Yong Shin Kim, Yuanyuan Yang, Charles S Henry
Numerous fabrication methods have been reported for microfluidic paper-based analytical devices (μPADs) using barrier materials ranging from photoresist to wax. While these methods have been used with wide success, consistently producing small, high-resolution features using materials and methods that are compatible with solvents and surfactants remains a challenge. Two new methods are presented here for generating μPADs with well-defined, high-resolution structures compatible with solvents and surfactant-containing solutions by partially or fully fusing paper with Parafilm® followed by cutting with a CO2 laser cutter...
February 2018: Sensors and Actuators. B, Chemical
https://www.readbyqxmd.com/read/29168402/liquid-metal-bath-as-conformable-soft-electrodes-for-target-tissue-ablation-in-radio-frequency-ablation-therapy
#10
Xuyang Sun, Zhi-Zhu He, Zhong-Shan Deng, Yi-Xin Zhou, Jing Liu
BACKGROUND: Radio-frequency ablation has been an important physical method for tumor hyperthermia therapy. The conventional rigid electrode boards are often uncomfortable and inconvenient for performing surgery on irregular tumors, especially for those tumors near the joints, such as ankles, knee-joints or other facets like finger joints. MATERIAL AND METHODS: We proposed and demonstrated a highly conformable tumor ablation strategy through introducing liquid metal bath as conformable soft electrodes...
November 23, 2017: Minimally Invasive Therapy & Allied Technologies: MITAT
https://www.readbyqxmd.com/read/29160225/phosphatidylserine-targeted-single-walled-carbon-nanotubes-for-photothermal-ablation-of-bladder-cancer
#11
Needa A Virani, Carole Davis, Patrick McKernan, Paul Hauser, Robert E Hurst, Joel Slaton, Ricardo P Silvy, Daniel E Resasco, Roger G Harrison
Bladder cancer has a 60-70% recurrence rate most likely due to residual tumour left behind after a transurethral resection (TUR). Failure to completely resect the cancer can lead to recurrence and progression into higher grade tumours with metastatic potential. We present here a novel therapy to treat superficial tumours with the potential to decrease recurrence. The therapy is a heat-based approach in which bladder tumour specific single-walled carbon nanotubes (SWCNTs) are delivered intravesically at a very low dose (0...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29151962/insufficient-radiofrequency-ablation-treated-hepatocellular-carcinoma-cells-promote-metastasis-by-up-regulation-itgb3
#12
Ning Zhang, Dening Ma, Lu Wang, Xiaodong Zhu, Qi Pan, Yiming Zhao, Weiping Zhu, Jiamin Zhou, Longrong Wang, Zongtao Chai, Jianyang Ao, Huichuan Sun, Zhaoyou Tang
Radiofrequency ablation (RFA) is one of the standards of care for early stage hepatocellular carcinoma (HCC). However, rapid progression of residual tumor after RFA has been confirmed. The aim of this study was to investigate the underlying mechanism of this phenomenon. Human HCC cell lines HCCLM3 and HepG2 were employed to establish insufficient RFA models in vivo and in vitro, respectively. The effects of insufficient RFA on metastatic potential of residual tumors were evaluated. The molecular changes after insufficient RFA were evaluated by PCR array, western blot, immunofluorescence, and immunohistochemistry...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/29148694/ambient-aqueous-synthesis-of-ultrasmall-ni0-85se-nanoparticles-for-non-invasive-photoacoustic-imaging-and-combined-photothermal-chemo-therapy-of-cancer
#13
Xianwen Wang, Fei Li, Xu Yan, Yan Ma, Zhaohua Miao, Liang Dong, Huajian Chen, Yang Lu, Zhengbao Zha
Big size induced long-term retention in the body has hampered the translational applications of many reported nanomedicine. Herein, we reported a multifunctional theranostic agent composed of ultrasmall polyacrylic acid functionalized Ni0.85Se nanoparticles (PAA-Ni0.85Se NPs), which were successfully obtained through a facile ambient aqueous precipitation strategy. Without exhibiting any noticeable toxicity, the as-prepared PAA-Ni0.85Se NPs (average diameter of 6.40 ± 1.89 nm) showed a considerable absorption in near-infrared (NIR) region and high photothermal conversion efficiency (PTCE) of 54...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29145298/small-cell-lung-cancer-treated-by-radiofrequency-ablation-a-case-report
#14
Guo-Qiang Song, Fei Chen, Farong Zang, Huoquan Lu, Bin Lin
RATIONALE: The morbidity and mortality of small cell lung cancer (SCLC), an uncommon malignancy of the lung, remain high. Radiofrequency ablation (RFA) creates heat to destroy cancer cells and is usually used to treat non-SCLC, but not SCLC. PATIENT CONCERNS: An 85-year-old male presented with a 2-month history of a productive cough with white phlegm and a 2-day history of hemoptysis. Chest computed tomography revealed a mass in the right lower lobe. DIAGNOSES: An excision biopsy of the mass showed SCLC...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29138559/human-mesenchymal-stem-cell-derived-iron-oxide-exosomes-allow-targeted-ablation-of-tumor-cells-via-magnetic-hyperthermia
#15
U Altanerova, M Babincova, P Babinec, K Benejova, J Jakubechova, V Altanerova, M Zduriencikova, V Repiska, C Altaner
Magnetic hyperthermia, or the heating of tissues using magnetic materials, is a promising approach for treating cancer. We found that human mesenchymal stem cells (MSCs) isolated from various tissues and MSCs expressing the yeast cytosine deaminase∷uracil phosphoribosyl transferase suicide fusion gene (yCD∷UPRT) can be labeled with Venofer, an iron oxide carbohydrate nanoparticle. Venofer labeling did not affect cell proliferation or the ability to home to tumors. All Venofer-labeled MSCs released exosomes that contained iron oxide...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29120818/near-infrared-dye-conjugated-oxidative-stress-amplifying-polymer-micelles-for-dual-imaging-and-synergistic-anticancer-phototherapy
#16
Wonseok Yang, Joungyoun Noh, Hoyeon Park, Sian Gwon, Berwin Singh, Chulgyu Song, Dongwon Lee
The recent advances in nanotechnology have led to the development of smart nanomaterials that combine diagnostic and therapeutic functions and provide synergistic anticancer effects through the combination of different treatment modalities. Here, we report a promising theranostic nanoconstruct that can translate into multiple functionalities: fluorescence/photoacoustic imaging, acid-triggered generation of ROS (reactive oxygen species), heat and singlet oxygen production under near infrared (NIR) laser irradiation, and coupling oxidative anticancer therapy to dual imaging-guided photothermal/photodynamic therapy...
October 27, 2017: Biomaterials
https://www.readbyqxmd.com/read/29116741/high-performance-plga-magnetic-microspheres-prepared-by-rotating-membrane-emulsification-for-transcatheter-arterial-embolization-and-magnetic-ablation-in-vx2-liver-tumors
#17
Yi-Jun Liang, Hui Yu, Guodong Feng, Linlin Zhuang, Wei Xi, Ming Ma, Jun Chen, Ning Gu, Yu Zhang
Interventional embolization is a popular minimally invasive vascular therapeutic technique and has been widely applied for hepatocellular carcinoma (HCC) therapy. However, harmful effects caused by transcatheter arterial chemoembolization (TACE) and radioembolization, such as the toxicity of chemotherapy or excessive radiation damage, are serious disadvantages and significantly reduce the therapeutic efficacy. Here, a synergistic therapeutic strategy combined transcatheter arterial embolization and magnetic ablation (TAEMA) by using PLGA-magnetic microspheres (MMs) has been successfully applied to orthotopic VX2 liver tumors of rabbits...
November 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29096566/perivascular-extension-of-microwave-ablation-zone-demonstrated-using-an-ex-vivo-porcine-perfusion-liver-model
#18
Saurabh Singh, Pulathis Nilantha Siriwardana, Edward William Johnston, Jennifer Watkins, Steve Bandula, Rowland Illing, Brian Ritchie Davidson
Microwave ablation (MWA) has been proposed to suffer less from the heat sink effect compared to radiofrequency ablation but has been reported to cause extension of the ablation zone along intrahepatic vessels in clinical practice. To study this effect in detail, eight fresh porcine livers were perfused in an ex-vivo organ perfusion system. Livers were perfused with oxygenated, O-positive human blood at 37°C. Perfusion was discontinued immediately before ablation in the non-perfused group (n = 4) whilst in the perfused group (n = 4) perfusion was maintained during MWA (140W X 2min)...
November 2, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29077118/cis-platinum-pro-drug-attached-cufes2-nanoplates-for-in-vivo-photothermal-photoacoustic-imaging-and-chemotherapy-photothermal-therapy-of-cancer
#19
Binbin Ding, Chang Yu, Chunxia Li, Xiaoran Deng, Jianxun Ding, Ziyong Cheng, Bengang Xing, Ping'an Ma, Jun Lin
Photothermal therapy (PTT) has attracted considerable attention in cancer treatment. Herein, the facile synthesis of copper iron sulfide (chalcopyrite, CuFeS2) nanoplates (NPs) with well-defined shape was achieved by a template-mediated method. Chitosan (CS), a linear cationic polysaccharide, was used to improve the physiological stability and biocompatibility. CuFeS2 NPs with strong near-infrared (NIR) absorbance enabled contrasts in photothermal and photoacoustic (PA) imaging. In vitro and in vivo tumor ablation studies further demonstrated that CS-functionalized CuFeS2 (CuFeS2-CS) NPs could convert 808 nm NIR light into heat for PTT with a photothermal conversion efficiency up to 30...
November 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/29076304/review-of-the-emerging-role-of-optical-polarimetry-in-characterization-of-pathological-myocardium
#20
Iftikhar Ahmad
Myocardial infarction (MI), a cause of significant morbidity and mortality, is typically followed by microstructural alterations where the necrotic myocardium is steadily replaced with a collagen scar. Engineered remodeling of the fibrotic scar via stem cell regeneration has been shown to improve/restore the myocardium function after MI. Nevertheless, the heterogeneous nature of the scar patch may impair the myocardial electrical integrity, leading to the formation of arrhythmogenesis. Radiofrequency ablation (RFA) offers an effective treatment for focal arrhythmias where local heating generated via electric current at specific spots in the myocardium ablate the arrhythmogenic foci...
October 2017: Journal of Biomedical Optics
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