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https://www.readbyqxmd.com/read/27914983/neuropeptide-y-y1-receptor-mediated-biodegradable-photoluminescent-nanobubbles-as-ultrasound-contrast-agents-for-targeted-breast-cancer-imaging
#1
Juan Li, Yuchen Tian, Dingying Shan, An Gong, Leyong Zeng, Wenzhi Ren, Lingchao Xiang, Ethan Gerhard, Jinshun Zhao, Jian Yang, Aiguo Wu
Targeted molecular imaging has attracted great attention in cancer diagnosis and treatment. However, most clinically used ultrasound contrast agents (UCAs) are non-targeted microbubbles seldom used for cancer imaging. Here, we fabricated fluorescent nanobubbles (NBs) by encapsulation of liquid tetradecafluorohexane (C6F14) within biodegradable photoluminescent polymers (BPLPs) through an emulsion-evaporation process and conjugation of PNBL-NPY ligand for specific targeting of Y1 receptors overexpressed in breast tumors...
November 22, 2016: Biomaterials
https://www.readbyqxmd.com/read/27913498/long-term-risk-of-second-malignancy-and-cardiovascular-disease-after-hodgkin-lymphoma-treatment
#2
Flora E van Leeuwen, Andrea K Ng
Long-term survivors of Hodgkin lymphoma (HL) experience several late adverse effects of treatment, with second malignant neoplasms (SMNs) and cardiovascular diseases (CVDs) being the leading causes of death in these patients. Other late effects have also been identified, such as pulmonary dysfunction, endocrinopathies (thyroid dysfunction, infertility), neck muscle atrophy, and persistent fatigue. HL survivors have two- to fourfold increased risks to develop SMNs and CVD compared with the general population...
December 2, 2016: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/27913458/therapy-related-myeloid-neoplasms-does-knowing-the-origin-help-to-guide-treatment
#3
Michael Heuser
Therapy-related myeloid neoplasms (t-MN) combine t-MDS and therapy related acute myeloid leukemia (t-AML) patients in one entity because of their similar pathogenesis, rapid progression from t-MDS to t-AML, and their equally poor prognosis. Treatment with epipodophyllotoxins like etoposide has been associated with a short interval between treatment and development of t-AML, with fusion oncogenes like KMT2A/MLL-MLLT3 and a better prognosis. In contrast, treatment with alkylating agents has been associated with a longer latency, an initial MDS phase, adverse cytogenetics, and a poor prognosis...
December 2, 2016: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/27913328/subharmonic-response-of-polymer-contrast-agents-based-on-the-empirical-mode-decomposition
#4
Rintaro Hayashi, John S Allen, Parag V Chitnis, Jonathan Mamou, Jeffrey A Ketterling
The subharmonic threshold for ultrasound contrast agents has been defined as a 20-25 dB difference between the fundamental and subharmonic (2/1) spectral components of the backscatter signal. However, this Fourier-based criterion assumes a linear time-invariant signal. A more appropriate criterion for short cycle and frequency-modulated waveforms is proposed with an adaptive signal-processing approach based on the empirical mode decomposition (EMD) method. The signal is decomposed into an orthogonal basis known as intrinsic mode functions (IMFs) and a subharmonic threshold is defined with respect to the energy ratio of the subharmonic IMF component to that of the incident signal...
December 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27912879/how-do-the-alkaloids-emetine-and-homoharringtonine-kill-trypanosomes-an-insight-into-their-molecular-modes-of-action
#5
Sonja Krstin, Tamer Mohamed, Xiaojuan Wang, Michael Wink
BACKGROUND: Although Trypanosoma brucei causes deadly sleeping sickness, the number of the registered medications is rather limited. Some plant alkaloids are potent trypanocidal agents. PURPOSE: In this study, we wanted to elucidate the molecular modes of trypanocidal activity of the alkaloids emetine and homoharringtonine against Trypanosoma brucei brucei. METHODS: We investigated the activity of both alkaloids regarding growth recovery from alkaloid-induced stress...
December 15, 2016: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/27912031/three-dimensional-reconstruction-of-preoperative-imaging-improves-surgical-success-in-laparoscopy
#6
Tobias Simpfendörfer, Ziyao Li, Claudia Gasch, Frederik Drosdzol, Markus Fangerau, Michael Müller, Lena Maier-Hein, Markus Hohenfellner, Dogu Teber
PURPOSE: To show the benefit of three-dimensional (3D) reconstructions of preoperative imaging for surgical performance. METHODS: A laparoscopic training environment with 15 hidden lymph nodes was designed. Three of them were marked with radiographic contrast agent and were only distinguishable from unmarked nodes via CT imaging. Thirty-six surgeons were divided into two groups. To group 1 the unprocessed CT data were shown. Group 2 was additionally shown a 3D reconstruction of the anatomy...
December 2, 2016: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
https://www.readbyqxmd.com/read/27911452/rationally-encapsulated-gold-nanorods-improving-both-linear-and-nonlinear-photoacoustic-imaging-contrast-in-vivo
#7
Fei Gao, Linyi Bai, Siyu Liu, Ruochong Zhang, Jingtao Zhang, Xiaohua Feng, Yuanjin Zheng, Yanli Zhao
Photoacoustic tomography has emerged as a promising non-invasive imaging technique that integrates the merits of high optical contrast with high ultrasound resolution in deep scattering medium. Unfortunately, the blood background in vivo seriously impedes the quality of imaging due to its comparable optical absorption with contrast agents, especially in conventional linear photoacoustic imaging modality. In this study, we demonstrated that two hybrids consisting of gold nanorods (Au NRs) and zinc tetra(4-pyridyl)porphyrin (ZnTPP) exhibited a synergetic effect in improving optical absorption, conversion efficiency from light to heat, and thermoelastic expansion, leading to a notable enhancement in both linear (four times greater) and nonlinear (more than six times) photoacoustic signals as compared with conventional Au NRs...
December 2, 2016: Nanoscale
https://www.readbyqxmd.com/read/27911413/fabricating-a-uv-vis-and-raman-spectroscopy-immunoassay-platform
#8
Cynthia Hanson, Nathan D Israelsen, Michael Sieverts, Elizabeth Vargis
Immunoassays are used to detect proteins based on the presence of associated antibodies. Because of their extensive use in research and clinical settings, a large infrastructure of immunoassay instruments and materials can be found. For example, 96- and 384-well polystyrene plates are available commercially and have a standard design to accommodate ultraviolet-visible (UV-Vis) spectroscopy machines from various manufacturers. In addition, a wide variety of immunoglobulins, detection tags, and blocking agents for customized immunoassay designs such as enzyme-linked immunosorbent assays (ELISA) are available...
November 10, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27911291/a-metal-free-method-for-producing-mri-contrast-at-amyloid-%C3%AE
#9
Silvia Hilt, Tang Tang, Jeffrey H Walton, Madhu Budamagunta, Izumi Maezawa, Tamás Kálai, Kálmán Hideg, Vikrant Singh, Heike Wulff, Qizhi Gong, Lee-Way Jin, Angelique Louie, John C Voss
Alzheimer's disease (AD) is characterized by depositions of the amyloid-β (Aβ) peptide in the brain. The disease process develops over decades, with substantial neurological loss occurring before a clinical diagnosis of dementia can be rendered. It is therefore imperative to develop methods that permit early detection and monitoring of disease progression. In addition, the multifactorial pathogenesis of AD has identified several potential avenues for AD intervention. Thus, evaluation of therapeutic candidates over lengthy trial periods also demands a practical, noninvasive method for measuring Aβ in the brain...
November 26, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27911046/verticillium-dahliae-lysm-effectors-differentially-contribute-to-virulence-on-plant-hosts
#10
Anja Kombrink, Hanna Rovenich, Xiaoqian Shi-Kunne, Eduardo Rojas-Padilla, Grardy C M van den Berg, Emmanouil Domazakis, Ronnie de Jonge, Dirk-Jan Valkenburg, Andrea Sánchez-Vallet, Michael F Seidl, Bart P H J Thomma
Chitin-binding LysM effectors contribute to virulence of various plant pathogenic fungi that are causal agents of foliar diseases. Here, we report on LysM effectors of the soil-borne fungal vascular wilt pathogen Verticillium dahliae. Comparative genomics revealed three core LysM effectors that are conserved in a collection of V. dahliae strains. Remarkably, and in contrast to the previously studied LysM effectors of other plant pathogens, no expression of core LysM effectors was monitored in planta in a taxonomically diverse panel of host plants...
December 2, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27910951/molecular-imaging-with-engineered-physiology
#11
Mitul Desai, Adrian L Slusarczyk, Ashley Chapin, Mariya Barch, Alan Jasanoff
In vivo imaging techniques are powerful tools for evaluating biological systems. Relating image signals to precise molecular phenomena can be challenging, however, due to limitations of the existing optical, magnetic and radioactive imaging probe mechanisms. Here we demonstrate a concept for molecular imaging which bypasses the need for conventional imaging agents by perturbing the endogenous multimodal contrast provided by the vasculature. Variants of the calcitonin gene-related peptide artificially activate vasodilation pathways in rat brain and induce contrast changes that are readily measured by optical and magnetic resonance imaging...
December 2, 2016: Nature Communications
https://www.readbyqxmd.com/read/27910055/selective-pressure-regulated-retroinfusion-for-gene-therapy-application-in-ischemic-heart-disease
#12
Rabea Hinkel, Christian Kupatt
Coronary heart disease is still the leading cause of death in industrialized nations. Even though revascularization strategies such as coronary artery bypass graft surgery, percutaneous coronary intervention and enhanced drug therapy significantly improved the outcome, about 30 % of patients develop chronic heart failure. Ischemic heart disease and heart failure are characterized by an adverse remodeling of the heart, featuring cardiomyocyte hypertrophy, increased fibrosis and capillary rarefaction. Therefore, gene therapeutic approaches for the treatment of heart failure, such as the modulating contractile function or therapeutic neovascularization, seem to be promising...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27909053/endoplasmic-reticulum-stress-and-ca2-depletion-differentially-modulate-the-sterol-regulatory-protein-pcsk9-to-control-lipid-metabolism
#13
Paul Lebeau, Ali Al-Hashimi, Sudesh Sood, Sarka Lhotak, Pei Yu, Gabriel Gyulay, Guillaume Pare, S R Wayne Chen, Bernardo Trigatti, Annik Prat, Nabil Seidah, Richard C Austin
Accumulating evidence implicates endoplasmic reticulum (ER) stress as a mediator of impaired lipid metabolism, thereby contributing to fatty liver disease and atherosclerosis. Previous studies demonstrated that ER stress can activate the sterol regulatory element-binding protein-2 (SREBP2), an ER localized transcription factor that directly upregulates sterol-regulatory genes, including PCSK9. Given that PCSK9 contributes to atherosclerosis by targeting low-density lipoprotein (LDL) receptor (LDLR) degradation, our present study investigates a novel mechanism by which ER stress plays a role in lipid metabolism by examining its ability to modulate PCSK9 expression...
December 1, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27908724/cell-surface-engineering-to-embed-targeting-ligands-or-tracking-agents-on-the-cell-membrane
#14
Kwang Suk Lim, Daniel Y Lee, Gabriel M Valencia, Young-Wook Won, David A Bull
The key challenge to improve the efficacy of cell therapy is how to efficiently modify cells with a specific molecule or compound that can guide the cells to the target tissue. To address this, we have developed a cell surface engineering technology to non-invasively modify the cell surface. This technology can embed a wide variety of bioactive molecules on any cell surface and allow for the targeting of a wide range of tissues in a variety of disease states. Using our cell surface engineering technology, mesenchymal stem cells (MSC)s were modified with: 1) a homing peptide or a recombinant protein to facilitate the migration of the cells toward a specific molecular target; or 2) magnetic resonance imaging (MRI) contrast agents to allow for in vivo tracking of the cells...
November 28, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27908307/evolution-of-imaging-findings-laboratory-and-functional-parameters-in-rheumatoid-arthritis-patients-after-one-year-of-treatment-with-anti-tnf-%C3%AE-agents
#15
Efstathios E Detorakis, Eleftherios Magkanas, Ismini Lasithiotaki, Prodromos Sidiropoulos, Dimitrios T Boumpas, Nicholas Gourtsoyiannis, Katerina Antoniou, Maria Raissaki
OBJECTIVES: To investigate the efficacy and safety of anti-TNF-α agent treatment compared to non-biologic DMARDs in rheumatoid arthritis patients. METHODS: 82 consecutive patients, 29 males, 53 females, aged 42-79, diagnosed with RA and suitable for anti-TNF-α treatment composed two study groups: 42 with pre-existing rheumatoid arthritis-related interstitial lung disease (RA-ILD) and 40 without RA-ILD. Respective control groups consisted of 44 patients with pre-existing RA-ILD and 44 patients without RA-ILD, treated with non-biologic DMARDs...
October 27, 2016: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/27908202/intracranial-migration-of-iophendylate-four-decades-after-conventional-myelography
#16
Shao-Chung Wang, Ping-Sheng Lu, Patricia Wanping Wu, Chih-Hua Yeh, Chao-Jan Wang, Chih-Chen Chang
Iophendylate is an oil-based contrast agent used in conventional myelography before the 1980s. We report an unusual case of an 82-year-old woman with iophendylate migration into the intracranial cerebrospinal fluid space after myelography 40 years ago. The patient was treated conservatively and followed up regularly.
December 1, 2016: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/27906613/urinary-excretion-of-uric-acid-allantoin-and-8-oh-deoxyguanosine-in-uricase-knockout-mice
#17
K Inazawa, S Yamaguchi, M Hosoyamada, T Fukuuchi, N H Tomioka, N Yamaoka, K Kaneko
Although uricase-knockout (Uox KO) mice are reported to develop uric acid (UA) nephropathy, those that mature without severe nephropathy could be useful for research into purine metabolism in humans. In this study, we measured the urinary excretion of creatinine, UA, allantoin, and 8-hydroxy-2'-deoxyguanosine (8-OHdG) collected from Uox KO mice housed in metabolic cages. UA and allantoin were determined using liquid chromatography-mass spectrometry and creatinine and 8-OHdG were measured with a commercial kit...
December 2016: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/27906072/actrii-blockade-protects-mice-from-cancer-cachexia-and-prolongs-survival-in-the-presence-of-anti-cancer-treatments
#18
Shinji Hatakeyama, Serge Summermatter, Marie Jourdain, Stefan Melly, Giulia C Minetti, Estelle Lach-Trifilieff
BACKGROUND: Cachexia affects the majority of patients with advanced cancer and is associated with reduced treatment tolerance, response to therapy, quality of life, and life expectancy. Cachectic patients with advanced cancer often receive anti-cancer therapies against their specific cancer type as a standard of care, and whether specific ActRII inhibition is efficacious when combined with anti-cancer agents has not been elucidated yet. METHODS: In this study, we evaluated interactions between ActRII blockade and anti-cancer agents in CT-26 mouse colon cancer-induced cachexia model...
July 26, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27904441/dynamic-contrast-enhanced-ultrasound-of-the-bowel-wall-with-quantitative-assessment-of-crohn-s-disease-activity-in-childhood
#19
Damjana Kljucevsek, Dubravka Vidmar, Darja Urlep, Rok Dezman
BACKGROUND: Contrast-enhanced ultrasound (CEUS) has become an established non-invasive, patient-friendly imaging technique which improves the characterization of lesions. In addition, dynamic contrast-enhanced ultrasound (DCE-US) provides valuable information concerning perfusion of examined organs. This review addresses current applications of CEUS in children, focused on DCE-US of the bowel wall in patients with Crohn disease, which enables realtime assessment of the bowel wall vascularity with semi-quantitative and quantitative assessment of disease activity and response to medical treatment...
December 1, 2016: Radiology and Oncology
https://www.readbyqxmd.com/read/27903643/effects-of-antihypertensive-agents-on-intestinal-contractility-in-the-spontaneously-hypertensive-rat-angiotensin-receptor-system-down-regulation-by-losartan
#20
Glen S Patten, Mahinda Y Abeywardena
Hypertension is an inflammatory condition controlled by the renin angiotensin system and is linked to kidney disease, diabetes mellitus and recently to dysfunction of the gut. The aim of this study was to determine what effect anti-hypertensive drug treatments may have on intestinal function of the spontaneously hypertensive rat (SHR). In the first experiment SHR were treated with enalapril or hydralazine. In the second experiment SHR were treated with losartan with no-treatment as control for both experiments...
November 30, 2016: Journal of Pharmacology and Experimental Therapeutics
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