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https://www.readbyqxmd.com/read/28238138/dual-wavelength-triggered-gold-nanorods-for-anticancer-treatment
#1
Dennis B Pacardo, Frances S Ligler, Zhen Gu
Gold nanomaterials with light-responsive properties can be exploited as light-triggered delivery vehicles to enhance the therapeutic efficacy of anticancer drugs. Additionally, different wavelengths of light can be utilized to achieve the combined effects of light-triggered release of therapeutics and light-induced localized heating, which results in improved anticancer efficacy. Herein, we describe methods to develop gold nanorod (AuNR) complexes that provide drug delivery or photothermal therapy when activated by ultraviolet (UV) or near-infrared (NIR) wavelengths of light, respectively...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28238130/preparation-of-magnetic-nanoparticles-for-biomedical-applications
#2
Xiaolian Sun, Shouheng Sun
Magnetic nanoparticles have obtained great attention in the field of biomedicine in recent years owing to their excellent biocompatibility, unique magnetic properties, and ease of functionalization. Potential applications for functionalized magnetic nanoparticles span biomedical imaging, treatment via magnetic hyperthermia, drug delivery, and biosensing. This chapter provides detailed procedures for the synthesis, PEGylation, and bioconjugation of monodispersed Fe3O4 nanoparticles, hollow Fe3O4 nanoparticles, porous hollow Fe3O4 nanoparticles, and dumbbell-like Au-Fe3O4 nanoparticles...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28237713/poly-l-glutamic-acid-drug-delivery-system-for-the-intravesical-therapy-of-bladder-cancer-using-wga-as-targeting-moiety
#3
C Apfelthaler, M Anzengruber, F Gabor, M Wirth
In the management of bladder cancer, surgical resection of the tumour is usually followed by intravesical instillation of immunomodulatives and/or chemotherapeutics. The purpose of this local intravesical therapy is to eliminate residual malignant cells after surgical intervention. The main limitation of a localised adjuvant therapy is the insufficient concentration of the active pharmaceutical ingredient (API) in malignant cells due to the unique structure of the human urothelium making it an exclusively hard to overcome barrier in the human body...
February 22, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28228418/folic-acid-supplementation-increases-cutaneous-vasodilator-sensitivity-to-sympathetic-nerve-activity-in-older-adults
#4
Anna E Stanhewicz, Jody L Greaney, Lacy M Alexander, W Larry Kenney
During heat stress, blunted increases in skin sympathetic nervous system activity (SSNA) and reductions in end-organ vascular responsiveness contribute to the age-related reduction in reflex cutaneous vasodilation. In older adults, folic acid supplementation improves the cutaneous vascular conductance (CVC) response to passive heating; however, the influence of folic acid supplementation on SSNA:CVC transduction is unknown. Fourteen older adults (66±1yrs, 8M/6F) ingested folic acid (5mg·day(-1)) or placebo for 6 weeks in a randomized, double-blind, crossover design...
February 22, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28226512/hyperthermia-by-electromagnetic-fields-to-enhanced-clinical-results-in-oncology
#5
Gerard C van Rhoon, Maarten M Paulides, Jeannette M L van Holthe, Martine Franckena, Gerard C van Rhoon, Maarten M Paulides, Jeannette M L van Holthe, Martine Franckena, Maarten M Paulides, Martine Franckena, Gerard C van Rhoon, Jeannette M L van Holthe
Confining treatment to the tumor to improve therapeutic outcome and reduce toxicity, is a hot issue in cancer research. Hyperthermia is recognized as a strong sensitizer for radiotherapy and chemotherapy enhancing tumor control without increasing toxicity. Today's electromagnetic hyperthermia systems heat large tissue volumes with limited ability to selectively heat the tumor. Fortunately, tremendous improvements in 3-dimensional electromagnetic & temperature modelling provide an exciting opportunity to design advanced multi-element electromagnetic applicator systems...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226508/temperature-monitoring-during-radiofrequency-ablation-of-liver-in-vivo-trials
#6
P Saccomandi, G Frauenfelder, C Massaroni, M A Caponera, A Polimadei, F Taffoni, F M Di Matteo, G Costamagna, F Giurazza, E Schena, P Saccomandi, G Frauenfelder, C Massaroni, M A Caponera, A Polimadei, F Taffoni, F M Di Matteo, G Costamagna, F Giurazza, E Schena, F Taffoni, F M Di Matteo, F Giurazza, E Schena, G Costamagna, A Polimadei, G Frauenfelder, P Saccomandi, C Massaroni
Radiofrequency ablation (RFA) is a minimally invasive procedure used to treat tumors by means of hyperthermia, mostly through percutaneous approach. The tissue temperature plays a pivotal role in the achievement of the target volume heating, while sparing the surrounding healthy tissue from thermal damage. Several techniques for thermometry during RFA are investigated, most of them based on the use of single-point measurement system (e.g., thermocouples). The measurement of temperature map is crucial for the real-time control and fine adjustment of the treatment settings, to optimize the shape and size of the ablated volume...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28223795/nanoparticle-based-hyperthermia-distinctly-impacts-production-of-ros-expression-of-ki-67-top2a-and-tpx2-and-induction-of-apoptosis-in-pancreatic-cancer
#7
Robert Ludwig, Francisco J Teran, Ulf Teichgraeber, Ingrid Hilger
So far, the therapeutic outcome of hyperthermia has shown heterogeneous responses depending on how thermal stress is applied. We studied whether extrinsic heating (EH, hot air) and intrinsic heating (magnetic heating [MH] mediated by nanoparticles) induce distinct effects on pancreatic cancer cells (PANC-1 and BxPC-3 cells). The impact of MH (100 µg magnetic nanoparticles [MNP]/mL; H=23.9 kA/m; f=410 kHz) was always superior to that of EH. The thermal effects were confirmed by the following observations: 1) decreased number of vital cells, 2) altered expression of pro-caspases, and 3) production of reactive oxygen species, and 4) altered mRNA expression of Ki-67, TOP2A, and TPX2...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28223424/hsp70-inhibition-synergistically-enhances-the-effects-of-magnetic-fluid-hyperthermia-in-ovarian-cancer
#8
Karem A Court, Hiroto Hatakeyama, Sherry Y Wu, Mangala S Lingegowda, Cristian Rodriguez-Aguayo, Gabriel Lopez-Berestein, Lee Ju-Seog, Carlos Rinaldi, Eduardo J Juan, Anil K Sood, Madeline Torres-Lugo
Hyperthermia has been investigated as a potential treatment for cancer. However, specificity in hyperthermia application remains a significant challenge. Magnetic fluid hyperthermia (MFH) may be an alternative to surpass such a challenge, but implications of MFH at the cellular level are not well understood. Therefore, the present work focused on the examination of gene expression after MFH treatment and using such information to identify target genes that when inhibited could produce an enhanced therapeutic outcome after MFH...
February 21, 2017: Molecular Cancer Therapeutics
https://www.readbyqxmd.com/read/28218292/hyperthermia-and-chemotherapy-using-fe-salen-nanoparticles-might-impact-glioblastoma-treatment
#9
Makoto Ohtake, Masanari Umemura, Itaru Sato, Taisuke Akimoto, Kayoko Oda, Akane Nagasako, Jeong-Hwan Kim, Takayuki Fujita, Utako Yokoyama, Tomohiro Nakayama, Yujiro Hoshino, Mai Ishiba, Susumu Tokura, Masakazu Hara, Tomoya Muramoto, Sotoshi Yamada, Takatsugu Masuda, Ichio Aoki, Yasushi Takemura, Hidetoshi Murata, Haruki Eguchi, Nobutaka Kawahara, Yoshihiro Ishikawa
We previously reported that μ-oxo N,N'-bis(salicylidene)ethylenediamine iron [Fe(Salen)], a magnetic organic compound, has direct anti-tumor activity, and generates heat in an alternating magnetic field (AMF). We showed that Fe(Salen) nanoparticles are useful for combined hyperthermia-chemotherapy of tongue cancer. Here, we have examined the effect of Fe(Salen) on human glioblastoma (GB). Fe(Salen) showed in vitro anti-tumor activity towards several human GB cell lines. It inhibited cell proliferation, and its apoptosis-inducing activity was greater than that of clinically used drugs...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28215155/magnetic-nanoparticles-new-perspectives-in-drug-delivery
#10
Joanna Wong, Jeremy Prout, Alexander Seifalian
BACKGROUND: The study of magnetic nanoparticles (MNPs) for drug delivery has recently seen a surge of interest even though the first studies were conducted as early as in the seventies. Despite this, there are still gaps in the knowledge of the field, implicating the complexities in designing the ideal MNP for drug delivery. The large surface area of MNPs and the ability to manipulate with an externally applied magnetic field render the MNP a good candidate for targeted delivery of drugs...
February 14, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28210931/serotonin-syndrome-from-5-hydroxytryptophan-supplement-ingestion-in-a-9-month-old-labrador-retriever
#11
Hopkins Jennifer, Pardo Mariana, Bischoff Karyn
INTRODUCTION: 5-Hydroxytryptophan (5-HTP) supplements are available over the counter and labeled as sleeping aids and anxiolytics for human use. 5-HTP is a serotonin precursor and overdose can lead to serotonin syndrome. CASE REPORT: A 9-month-old female Labrador retriever was evaluated after ingestion of a 5-HTP supplement. Signs of agitation developed within 1 h of ingestion, and emesis was attempted by the owner with  3% hydrogen peroxide (H2O2) orally. On presentation, the dog was obtunded, bilaterally mydriatic and salivating...
February 16, 2017: Journal of Medical Toxicology: Official Journal of the American College of Medical Toxicology
https://www.readbyqxmd.com/read/28194714/is-limb-salvage-with-microwave-induced-hyperthermia-better-than-amputation-for-osteosarcoma-of-the-distal-tibia
#12
Kang Han, Peiye Dang, Na Bian, Xiang Chen, Tongtao Yang, QingYu Fan, Yong Zhou, Tingbao Zhao, Pingshan Wang
BACKGROUND: Amputation has been the standard surgical treatment for distal tibia osteosarcoma owing to its unique anatomic features. Preliminary research suggested that microwave-induced hyperthermia may have a role in treating osteosarcoma in some locations of the body (such as the pelvis), but to our knowledge, no comparative study has evaluated its efficacy in a difficult-to-treat location like the distal tibia. QUESTIONS: Does microwave-induced hyperthermia result in (1) improved survival, (2) decreased local recurrence, (3) improved Musculoskeletal Tumor Society (MSTS) scores, or (4) fewer complications than amputation in patients with a distal tibial osteosarcoma? METHODS: Between 2000 and 2015, we treated 79 patients for a distal tibia osteosarcoma without metastases...
February 13, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28192714/design-and-synthesis-of-temperature-responsive-polymer-silica-hybrid-nanoparticles-and-application-to-thermally-controlled-cellular-uptake
#13
Yuki Hiruta, Ryo Nemoto, Hideko Kanazawa
This study reports the development of temperature-responsive polymer/silica hybrid nanoparticles and their application to temperature-dependent intracellular uptake of hydrophobic encapsulated fluorescence molecules. Amphiphilic diblock copolymer comprising a temperature-responsive segment, poly(N-isopropylacrylamide-co-N,N-dimethylacrylamide) [P(NIPAAm-co-DMAAm)] and a trimethyoxysilyl-containing hydrophobic segment was synthesized (PBM-b-ND); this amphiphilic diblock copolymer self-assembled in an aqueous solution, and temperature-responsive polymer/silica hybrid fluorescence nanoparticles were fabricated via a base-catalyzed sol-gel process...
February 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28186432/development-of-anti-cd47-single-chain-variable-fragment-targeted-magnetic-nanoparticles-for-treatment-of-human-bladder-cancer
#14
Gashin Rezaei, Mahdi Habibi-Anbouhi, Morteza Mahmoudi, Kayhan Azadmanesh, Shima Moradi-Kalbolandi, Mahdi Behdani, Leila Ghazizadeh, Mohsen Abolhassani, Mohammad Ali Shokrgozar
AIM: To develop a novel anti-CD47 single-chain variable fragment (scFv) functionalized magnetic nanoparticles (MNPs) for targeting bladder cell lines and its applicability in thermotherapy. MATERIAL & METHODS: An immunized murine antibody phage display library was constructed and screened to isolate anti-CD47 binders. A scFv was selected and conjugated to MNPs which was then utilized to discriminate CD47(+) bladder cells along with assessing its efficacy in thermotherapy...
February 10, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28183672/in-vitro-biocompatibility-of-a-ferrimagnetic-glass-ceramic-for-hyperthermia-application
#15
Oana Bretcanu, Marta Miola, Claudia L Bianchi, Ida Marangi, Roberta Carbone, Ingrid Corazzari, Mario Cannas, Enrica Verné
Ferrimagnetic glass-ceramics containing magnetite crystals were developed for hyperthermia applications of solid neoplastic tissue. The present work is focused on in vitro evaluation of the biocompatibility of these materials, before and after soaking in a simulated body fluid (SBF). X-ray diffraction, scanning electron microscopy, atomic absorption spectrophotometry, X-ray photoelectron spectrometry and pH measurements were employed in glass-ceramic characterisation. The free-radical mediated reactivity of the glass-ceramic was evaluated by Electron Paramagnetic Resonance (EPR) spin trapping...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28181163/effect-of-synthesis-temperature-on-structure-and-magnetic-properties-of-la-nd-0-7sr0-3mno3-nanoparticles
#16
Yulia Shlapa, Sergii Solopan, Andrii Bodnaruk, Mykola Kulyk, Viktor Kalita, Yulia Tykhonenko-Polishchuk, Alexandr Tovstolytkin, Anatolii Belous
Two sets of Nd-doped La0.7Sr0.3MnO3 nanoparticles were synthesized via sol-gel method with further heat treatment at 1073 and 1573 K, respectively. Crystallographic and magnetic properties of obtained nanoparticles were studied, and the effect of synthesis conditions on these properties was investigated. According to X-ray data, all particles crystallized in the distorted perovskite structure. Magnetic parameters, such as saturation magnetization, coercivity, Curie temperature, and specific loss power, which is released on the exposure of an ensemble of nanoparticles to AC magnetic field, were determined for both sets of samples...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28177898/maternal-dietary-zinc-supplementation-enhances-the-epigenetic-activated-antioxidant-ability-of-chick-embryos-from-maternal-normal-and-high-temperatures
#17
Yongwen Zhu, Xiudong Liao, Lin Lu, Wenxiang Li, Liyang Zhang, Cheng Ji, Xi Lin, Hsiao-Ching Liu, Jack Odle, Xugang Luo
The role of maternal dietary zinc supplementation in protecting the embryos from maternal hyperthermia-induced negative effects via epigenetic mechanisms was examined using an avian model (Gallus gallus). Broiler breeder hens were exposed to two maternal temperatures (21°C and 32°C) × three maternal dietary zinc treatments (zinc-unsupplemented control diet, the control diet + 110 mg zinc/kg inorganic or organic zinc) for 8 weeks. Maternal hyperthermia increased the embryonic mortality and induced oxidative damage evidenced by the elevated mRNA expressions of heat shock protein genes...
February 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/28166946/preventive-effects-of-supplemental-dietary-zinc-on-heat-induced-damage-in-the-epididymis-of-boars
#18
Zhaojian Li, Yansen Li, Xin Zhou, Yun Cao, Chunmei Li
Hyperthermia in boars reduces growth performance and sperm production. Zinc is an essential trace element in animal nutrition. Here we investigate the effects of dietary zinc on epididymal structure and function in Bama miniature pigs treated with heat exposure and investigate approaches to improve the reproductive performance in summer. Male Bama miniature pigs (n=18; aged 6 months; bodyweight=10.79±0.06kg) were randomly allocated to 3 groups: control group (Control), heat treatment group (HT), and the diet-supplemented and heat treatment group (H+Zn)...
February 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28163565/magnetomotive-optical-coherence-elastography-for-magnetic-hyperthermia-dosimetry-based-on-dynamic-tissue-biomechanics
#19
Pin-Chieh Huang, Paritosh Pande, Adeel Ahmad, Marina Marjanovic, Darold R Spillman, Boris Odintsov, Stephen A Boppart
Magnetic nanoparticles (MNPs) have been used in many diagnostic and therapeutic biomedical applications over the past few decades to enhance imaging contrast, steer drugs to targets, and treat tumors via hyperthermia. Optical coherence tomography (OCT) is an optical biomedical imaging modality that relies on the detection of backscattered light to generate high-resolution cross-sectional images of biological tissue. MNPs have been utilized as imaging contrast and perturbative mechanical agents in OCT in techniques called magnetomotive OCT (MM-OCT) and magnetomotive elastography (MM-OCE), respectively...
July 2016: IEEE Journal of Selected Topics in Quantum Electronics
https://www.readbyqxmd.com/read/28162872/simple-and-effective-method-to-lower-body-core-temperatures-of-hyperthermic-patients
#20
John P O'Connor
Hyperthermia is a potentially life threatening scenario that may occur in patients due to accompanying morbidities, exertion, or exposure to dry and arid environmental conditions. In particular, heat stroke may result from environmental exposure combined with a lack of thermoregulation. Key clinical findings in the diagnosis of heatstroke are (1) a history of heat stress or exposure, (2) a rectal temperature greater than 40 °C, and (3) central nervous system dysfunction (altered mental state, disorientation, stupor, seizures, or coma) (Prendergast and Erickson, 2014 [1])...
January 30, 2017: American Journal of Emergency Medicine
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