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https://www.readbyqxmd.com/read/28431327/dendrimer-conjugated-iron-oxide-nanoparticles-as-stimuli-responsive-drug-carriers-for-thermally-activated-chemotherapy-of-cancer
#1
Saumya Nigam, Dhirendra Bahadur
In recent years, functional nanomaterials have found an appreciable place in the understanding and treatment of cancer. This work demonstrates the fabrication and characterization of a new class of cationic, biocompatible, peptide dendrimers, which were then used for stabilizing and functionalizing magnetite nanoparticles for combinatorial therapy of cancer. The synthesized peptide dendrimers have an edge over the widely used PAMAM dendrimers due to better biocompatibility and negligible cytotoxicity of their degradation products...
April 13, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28426202/chemical-design-and-synthesis-of-functionalized-probes-for-imaging-and-treating-tumor-hypoxia
#2
Jia-Nan Liu, Wenbo Bu, Jianlin Shi
Hypoxia development in tumor is closely associated with its increased aggressiveness and strong resistance to therapy, leading to the poor prognosis in several cancer types. Clinically, invasive oxygen microelectrode and high dosage radiotherapy are often utilized to accurately detect and effectively fight hypoxia. Recently, however, there has been a surge of interdisciplinary research aiming at developing functional molecules and nanomaterials that can be used to noninvasively image and efficiently treat hypoxic tumors...
April 20, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28424829/-mri-of-the-prostate
#3
D Nörenberg, O Solyanik, B Schlenker, G Magistro, B Ertl-Wagner, D A Clevert, C Stief, M F Reiser, M D'Anastasi
New clinical and technological advances in the field of magnetic resonance imaging (MRI) and targeted image-guided biopsy techniques have significantly improved the detection, localization and staging as well as active surveillance of prostate cancer in recent years. Multiparametric MRI (mpMRI) is currently the main imaging technique for the detection, characterization and diagnostics of metastasizing prostate cancer and is of high diagnostic importance for local staging within the framework of the detection of prostate cancer...
April 19, 2017: Der Urologe. Ausg. A
https://www.readbyqxmd.com/read/28415647/contrast-agents-in-dynamic-contrast-enhanced-magnetic-resonance-imaging
#4
REVIEW
Yuling Yan, Xilin Sun, Baozhong Shen
Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) is a noninvasive method to assess angiogenesis, which is widely used in clinical applications including diagnosis, monitoring therapy response and prognosis estimation in cancer patients. Contrast agents play a crucial role in DCE-MRI and should be carefully selected in order to improve accuracy in DCE-MRI examination. Over the past decades, there was much progress in the development of optimal contrast agents in DCE-MRI. In this review, we describe the recent research advances in this field and discuss properties of contrast agents, as well as their advantages and disadvantages...
March 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28415433/multifunctional-nanospheres-for-co-delivery-of-methotrexate-and-mild-hyperthermia-to-colon-cancer-cells
#5
Sofia A Costa Lima, André Gaspar, Salette Reis, Luísa Durães
A multifunctional nanomedicine platform was designed and evaluated for efficient colon cancer therapy by a combinatorial therapeutic approach based on a chemotherapeutic drug and mild hyperthermia. Advantage was taken from the dual role of methotrexate (MTX), as folate receptor-targeting, overexpressed in tumor cells, and as anticancer drug. Incorporation of superparamagnetic iron oxide nanoparticles (SPIONs) allows to heat cancer cells externally through an alternating magnetic field. The developed nanocarrier was based on polyethylene glycol-polylactic acid (PEG-PLA) nanospheres to improve biocompatibility, enhancing their targeting by prolonging blood circulation time...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28414399/current-understanding-of-the-health-effects-of-electromagnetic-fields
#6
Tayaba Miah, Deepak Kamat
There has been an exponential increase in the use of electronic devices over the past few decades. This has led to increased exposure to electromagnetic fields (EMF). Electric fields result from differences in voltage, whereas magnetic fields result from the flow of electric current. Higher-frequency waves of EMF have more energy than lower-frequency waves, and thus generally tend to be more harmful. An EMF activates cellular stress response and also causes breaks in DNA strands. There are many methodological barriers to effectively measuring the associations of EMF and childhood cancers...
April 1, 2017: Pediatric Annals
https://www.readbyqxmd.com/read/28410781/virtual-screen-to-nmr-vs2nmr-discovery-of-fragment-hits-for-the-cbp-bromodomain
#7
Dimitrios Spiliotopoulos, Jian Zhu, Eike-Christian Wamhoff, Nicholas Deerain, Jean-Rémy Marchand, Jonas Aretz, Christoph Rademacher, Amedeo Caflisch
Overexpression of the CREB-binding protein (CBP), a bromodomain-containing transcription coactivator involved in a variety of cellular processes, has been observed in several types of cancer with a correlation to aggressiveness. We have screened a library of nearly 1500 fragments by high-throughput docking into the CBP bromodomain followed by binding energy evaluation using a force field with electrostatic solvation. Twenty of the 39 fragments selected by virtual screening are positive in one or more ligand-observed nuclear magnetic resonance (NMR) experiments...
April 4, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28389657/lf-mf-inhibits-iron-metabolism-and-suppresses-lung-cancer-through-activation-of-p53-mir-34a-e2f1-e2f3-pathway
#8
Jing Ren, Liang Ding, Qianyun Xu, Guoping Shi, Xiaojing Li, Xiujun Li, Jianjian Ji, Dongya Zhang, Yaping Wang, Tingting Wang, Yayi Hou
Our previous studies showed that low frequency magnetic fields (LF-MF) suppressed tumor growth and influenced the function of immune system. Nevertheless the mechanisms behind the effect of LF-MF still remain to be elucidated. In this study, Tumor- bearing mice subcutaneously inoculated with Lewis lung cancer cells were exposed to a LF-MF (0.4T, 7.5 Hz) for 35 days and Survival rate, tumor growth and the tumor markers were measured. Results showed that tumor growth was obviously inhibited with a prolonged survival of tumor- bearing mice by LF-MF exposure...
April 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28385267/a-review-on-hyperthermia-via-nanoparticle-mediated-therapy
#9
REVIEW
Ayesha Sohail, Zaki Ahmad, O Anwar Bég, Sarmad Arshad, Lubna Sherin
Hyperthermia treatment, generated by magnetic nanoparticles (MNPs) is promising since it is tumour-focused, minimally invasive and uniform. The most unique feature of magnetic nanoparticles is its reaction and modulation by a magnetic force basically responsible for enabling its potential as heating mediators for cancer therapy. In magnetic nanoparticle hyperthermia, a tumour is preferentially loaded with systemically administered nanoparticles with high-absorption cross-section for transduction of an extrinsic energy source to heat...
April 3, 2017: Bulletin du Cancer
https://www.readbyqxmd.com/read/28384123/magnetic-resonance-imaging-with-hyperpolarized-agents-methods-and-applications
#10
Erin Adamson, Kai Ludwig, David Mummy, Sean B Fain
In the past decade, hyperpolarized (HP) contrast agents have been under active development for MRI applications to address the twin challenges of functional and quantitative imaging. Both HP helium (<sup>3</sup>He) and xenon (<sup>129</sup>Xe) gases have reached the stage where they are under study in clinical research. HP <sup>129</sup>Xe, in particular, is poised for larger scale clinical research to investigate asthma, chronic obstructive pulmonary disease, and fibrotic lung diseases...
April 6, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28382158/phase-transitional-fe3o4-perfluorohexane-microspheres-for-magnetic-droplet-vaporization
#11
Ronghui Wang, Yang Zhou, Ping Zhang, Yu Chen, Wei Gao, Jinshun Xu, Hangrong Chen, Xiaojun Cai, Kun Zhang, Pan Li, Zhigang Wang, Bing Hu, Tao Ying, Yuanyi Zheng
Activating droplets vaporization has become an attractive strategy for ultrasound imaging and physical therapy due to the significant increase in ultrasound backscatter signals and its ability to physically damage the tumor cells. However, the current two types of transitional droplets named after their activation methods have their respective limitations. To circumvent the limitations of these activation methods, here we report the concept of magnetic droplet vaporization (MDV) for stimuli-responsive cancer theranostics by a magnetic-responsive phase-transitional agent...
2017: Theranostics
https://www.readbyqxmd.com/read/28379690/pegylated-anionic-magnetofluorescent-nanoassemblies-impact-of-their-interface-structure-on-magnetic-resonance-imaging-contrast-and-cellular-uptake
#12
Camille Linot, Julien Poly, Joanna Boucard, Daniel Pouliquen, Steven Nedellec, Philippe Hulin, Nadège Marec, Paolo Arosio, Alessandro Lascialfari, Andrea Guerrini, Claudio Sangregorio, Marc Lecouvey, Lénaïc Lartigue, Christophe Blanquart, Eléna Ishow
Controlling the interactions of functional nanostructures with water and biological media represents high challenges in the field of bioimaging applications. Large contrast at low doses, high colloidal stability in physiological conditions, the absence of cell cytotoxicity, and efficient cell internalization represent strong additional needs. To achieve such requirements, we report on high-payload magnetofluorescent architectures made of a shell of superparamagnetic iron oxide nanoparticles tightly anchored around fluorescent organic nanoparticles...
April 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28378707/relaxation-based-viscosity-mapping-for-magnetic-particle-imaging
#13
M Utkur, Y Muslu, E U Saritas
Magnetic particle imaging (MPI) has been shown to provide remarkable contrast for imaging applications such as angiography, stem cell tracking, and cancer imaging. Recently, there is growing interest in the functional imaging capabilities of MPI, where 'color MPI' techniques have explored separating different nanoparticles, which could potentially be used to distinguish nanoparticles in different states or environments. Viscosity mapping is a promising functional imaging application for MPI, as increased viscosity levels in vivo have been associated with numerous diseases such as hypertension, atherosclerosis, and cancer...
April 5, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28372104/restoring-speech-following-total-removal-of-the-larynx-by-a-learned-transformation-from-sensor-data-to-acoustics
#14
James M Gilbert, Jose A Gonzalez, Lam A Cheah, Stephen R Ell, Phil Green, Roger K Moore, Ed Holdsworth
Total removal of the larynx may be required to treat laryngeal cancer: speech is lost. This article shows that it may be possible to restore speech by sensing movement of the remaining speech articulators and use machine learning algorithms to derive a transformation to convert this sensor data into an acoustic signal. The resulting "silent speech," which may be delivered in real time, is intelligible and sounds natural. The identity of the speaker is recognisable. The sensing technique involves attaching small, unobtrusive magnets to the lips and tongue and monitoring changes in the magnetic field induced by their movement...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28370668/forecastable-and-guidable-bubble-propelled-microplate-motors-for-cell-transport
#15
Narisu Hu, Bin Zhang, Meiyu Gai, Ce Zheng, Johannes Frueh, Qiang He
Cell transport is important to renew body functions and organs with stem cells, or to attack cancer cells with immune cells. The main hindrances of this method are the lack of understanding of cell motion as well as proper transport systems. In this publication, bubble-propelled polyelectrolyte microplates are used for controlled transport and guidance of HeLa cells. Cells survive attachment on the microplates and up to 22 min in 5% hydrogen peroxide solution. They can be guided by a magnetic field whereby increased friction of cells attached to microplates decreases the speed by 90% compared to pristine microplates...
March 31, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28359890/artemisinin-loaded-chitosan-magnetic-nanoparticles-for-theefficient-targeting-to-the-breast-cancer
#16
Subramanian Natesan, Chandrasekar Ponnusamy, Abimanyu Sugumaran, Senthilkumar Chelladurai, Sharavanan Shanmugam Palaniappan, Rajaguru Palanichamy
Artemisinin, a natural anti-malarial agent, also possesses anti-proliferative and anti-angiogenic activity in cancer cells with very low toxicity to normal healthy cells. Drug loaded magnetic nanoparticlesby using external magnetic field could selectively accumulate the drug at the target site and thereby reduce the doses required to achieve therapeutic concentration which may otherwise produce serious side effects on healthy cells. In the present study the artemisinin magnetic nanoparticles were successfully formulated using chitosan by ionic-gelation method...
March 27, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28359816/design-and-evaluation-of-surface-functionalized-superparamagneto-plasmonic-nanoparticles-for-cancer-therapeutics
#17
M Ravichandran, Goldie Oza, S Velumani, Jose Tapia Ramirez, A Vera, L Leija
Designing a multifunctional nanomaterial is always considered as a biggest concern in the field of nanomedicine which aims to promote versatile action in a single use from tracking to therapeutics. Therefore, metallic nanoparticles are well exploited as a major platform with the assemblage of surface modifications which can be effectively engaged for plenty of applications. Here, in this work, we have successfully amalgamated gold coated magnetite core-shell nanoparticles along with bio-functionalization of folic acid and doxorubicin to explore its possibility as a distinct nanocargo for cancer nanotheranostics...
March 28, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28358256/fluorescent-multi-responsive-cross-linked-p-n-isopropylacrylamide-based-nanocomposites-for-cisplatin-delivery
#18
Zahra Shakoori, Hossein Ghanbari, Yadollah Omidi, Maryam Pashaiasl, Abolfazl Akbarzadeh, Zohreh Jomeh Farsangi, Seyed Mahdi Rezayat, Soodabeh Davaran
Magnetic, pH and temperature-sensitive, poly(N-isopropylacrylamide) (PNIPAM)-based nanocomposite with fluorescent properties, were synthesized by free radical copolymerization-cross linking of NIPAM, N, N-dimethylaminoethyl methacrylate (DMAEMA) and 4-acrylamidofluorescein (AFA). The model anti-cancer drug, cisplatin (CDDP), was loaded into the resulted nanogel. For the production of CDDP-loaded nanocomposite, Fe3O4 magnetic nanoparticles (MNPs) and CDDP were loaded into the nanogel. Field-emission scanning electron microscopy (FE-SEM) indicated that the size of nanogel and CDDP-loaded nanocomposite were about 90 and 160 nm, respectively...
March 30, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/28352117/berkson-error-adjustment-and-other-exposure-surrogates-in-occupational-case-control-studies-with-application-to-the-canadian-interocc-study
#19
Tamer Oraby, Siva Sivaganesan, Joseph D Bowman, Laurel Kincl, Lesley Richardson, Mary McBride, Jack Siemiatycki, Elisabeth Cardis, Daniel Krewski
Many epidemiological studies assessing the relationship between exposure and disease are carried out without data on individual exposures. When this barrier is encountered in occupational studies, the subject exposures are often evaluated with a job-exposure matrix (JEM), which consists of mean exposure for occupational categories measured on a comparable group of workers. One of the objectives of the seven-country case-control study of occupational exposure and brain cancer risk, INTEROCC, was to investigate the relationship of occupational exposure to electromagnetic fields (EMF) in different frequency ranges and brain cancer risk...
March 29, 2017: Journal of Exposure Science & Environmental Epidemiology
https://www.readbyqxmd.com/read/28350351/assembly-of-iron-oxide-nanocubes-for-enhanced-cancer-hyperthermia-and-magnetic-resonance-imaging
#20
Minjung Cho, Antonio Cervadoro, Maricela R Ramirez, Cinzia Stigliano, Audrius Brazdeikis, Vicki L Colvin, Pierluigi Civera, Jaehong Key, Paolo Decuzzi
Multiple formulations of iron oxide nanoparticles (IONPs) have been proposed for enhancing contrast in magnetic resonance imaging (MRI) and for increasing efficacy in thermal ablation therapies. However, insufficient accumulation at the disease site and low magnetic performance hamper the clinical application of IONPs. Here, 20 nm iron oxide nanocubes were assembled into larger nanoconstructs externally stabilized by a serum albumin coating. The resulting assemblies of nanocubes (ANCs) had an average diameter of 100 nm and exhibited transverse relaxivity (r₂ = 678...
March 28, 2017: Nanomaterials
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