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Microbubbles

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https://www.readbyqxmd.com/read/29350100/transorbital-doppler-with-carotid-siphon-monitoring-detects-right-to-left-shunt-effectively
#1
Zhihui Duan, Zhiyuan Yang, Binbin Song, Congmin Ma, Yan Li, Yanjiao Du, Dandan Shang, Shao Li, Jiyu Lou
Background Transtemporal Doppler (TTD) with middle cerebral artery (MCA) is widely used for right-to-left shunt (RLS) detection. However, an alternative method for patients without suitable temporal bone windows should be established. The present study prospectively evaluated the effectiveness of transorbital Doppler (TOD) with carotid siphon (CS) monitoring in detecting RLS. Methods A total of 357 subjects with sufficient temporal bone windows underwent simultaneous TTD with MCA and TOD with CS. After injection of microbubbles, the numbers of artificial high-intensity signals were recorded at rest and after Valsalva maneuver...
January 19, 2018: Neurological Research
https://www.readbyqxmd.com/read/29349360/ultrasound-induced-microbubble-cavitation-for-the-treatment-of-catheterization-induced-vasospasm
#2
Shelby Kutty, Na Liu, Jia Zhou, Yunbin Xiao, Juefei Wu, David Danford, John Lof, Feng Xie, Thomas R Porter
No abstract text is available yet for this article.
December 2017: JACC. Basic to Translational Science
https://www.readbyqxmd.com/read/29347307/dynamics-of-nonspherical-microbubble-oscillations-above-instability-threshold
#3
Matthieu Guédra, Sarah Cleve, Cyril Mauger, Philippe Blanc-Benon, Claude Inserra
Time-resolved dynamics of nonspherical oscillations of micrometer-sized bubbles are captured and analyzed using high-speed imaging. The axisymmetry of the bubble shape is ensured with certainty for the first time from the recordings of two synchronous high-speed cameras located at 90^{∘}. The temporal dynamics of finite-amplitude nonspherical oscillations are then analyzed for various acoustic pressures above the instability threshold. The experimental results are compared with recent theories accounting for nonlinearities and mode coupling, highlighting particular effects inherent to these mechanisms (saturation of the instability, triggering of nonparametric shape modes)...
December 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346713/spark-generated-microbubble-cell-sorter-for-microfluidic-flow-cytometry
#4
Jingjing Zhao, Zheng You
High-speed and accurate cell sorting is of great significance for cell analysis regarding both bioresearch and clinical application. Different from the jet-in-air sorting of commercial flow cytometers, sorting in fully enclosed and disposal microfluidic chips can avoid aerosols and crosscontamination, thus contributing to the improvement of biosafety and test accuracy. However, current microfluidic sorters usually require complicated structures, or otherwise cannot attain high throughput. In this article, a sorting mechanism for microfluidics is proposed for the first time based on the jet flow induced by the spark-generated cavitation microbubble that can be easily realized by a pair of electrodes...
January 18, 2018: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
https://www.readbyqxmd.com/read/29339208/targeted-shrna-loaded-liposome-complex-combined-with-focused-ultrasound-for-blood-brain-barrier-disruption-and-suppressing-glioma-growth
#5
Guanjian Zhao, Qin Huang, Feng Wang, Xiang Zhang, Jiangang Hu, Ying Tan, Ning Huang, Zhigang Wang, Zhibiao Wang, Yuan Cheng
Our previous studies have demonstrated that focused ultrasound (FUS) combined with DNA-loaded microbubbles (MBs) can induce noninvasive, reversible, local disruption of the blood brain barrier (BBB) and enable targeted exogenous gene transfer into the central nervous system. However, due to low gene loading or the absence of positive targeting, to date, there has been no therapeutic effect of MBs combined with FUS in tumor treatment. In the current study, we adopted a phospholipid complex that exhibited sufficient gene loading and peptide-mediated targeting to delay glioma growth...
January 12, 2018: Cancer Letters
https://www.readbyqxmd.com/read/29338562/targeted-microbubbles-with-ultrasound-irradiation-and-pd-1-inhibitor-to-increase-antitumor-activity-in-b-cell-lymphoma
#6
Shiya Zheng, Dan Song, Xiaoxiao Jin, Haijun Zhang, Mohanad Aldarouish, Yan Chen, Cailian Wang
AIM: Severe cardiac toxicity of doxorubicin and an immunosuppressive tumor micro-environment become main obstacles for the effective treatment of B-cell lymphoma. In this research, rituximab-conjugated and doxorubicin-loaded microbubbles (RDMs) were designed for exploring a combination approach of targeted microbubbles with ultrasound (US) irradiation and PD-1 inhibitor to overcome obstacles mentioned above. METHODS: In vivo studies were performed on SU-DHL-4 cell-grafted mice and ex vivo studies were performed on CD20+ human SU-DHL-4 cells and human T cells...
January 17, 2018: Nanomedicine
https://www.readbyqxmd.com/read/29338016/ultrasound-mediated-delivery-and-distribution-of-polymeric-nanoparticles-in-the-normal-brain-parenchyma-of-a-metastatic-brain-tumour-model
#7
Habib Baghirov, Sofie Snipstad, Einar Sulheim, Sigrid Berg, Rune Hansen, Frits Thorsen, Yrr Mørch, Catharina de Lange Davies, Andreas K O Åslund
The treatment of brain diseases is hindered by the blood-brain barrier (BBB) preventing most drugs from entering the brain. Focused ultrasound (FUS) with microbubbles can open the BBB safely and reversibly. Systemic drug injection might induce toxicity, but encapsulation into nanoparticles reduces accumulation in normal tissue. Here we used a novel platform based on poly(2-ethyl-butyl cyanoacrylate) nanoparticle-stabilized microbubbles to permeabilize the BBB in a melanoma brain metastasis model. With a dual-frequency ultrasound transducer generating FUS at 1...
2018: PloS One
https://www.readbyqxmd.com/read/29333289/localized-single-cell-lysis-and-manipulation-using-optothermally-induced-bubbles
#8
Qihui Fan, Wenqi Hu, Aaron T Ohta
Localized single cells can be lysed precisely and selectively using microbubbles optothermally generated by microsecond laser pulses. The shear stress from the microstreaming surrounding laser-induced microbubbles and direct contact with the surface of expanding bubbles cause the rupture of targeted cell membranes. High-resolution single-cell lysis is demonstrated: cells adjacent to targeted cells are not lysed. It is also shown that only a portion of the cell membrane can be punctured using this method. Both suspension and adherent cell types can be lysed in this system, and cell manipulation can be integrated for cell-cell interaction studies...
April 2017: Micromachines
https://www.readbyqxmd.com/read/29328270/ultrasensitive-fiber-tilt-sensor-based-on-a-mobile-inscribed-microbubble-along-the-arc-shaped-inwall-of-the-microcavity-publisher-s-note
#9
Kunjian Cao, Yi Liu, Shiliang Qu
This publisher's note corrects an error in the funding section in Opt. Lett.42, 4418 (2017).OPLEDP0146-959210.1364/OL.42.004418.
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29326057/antidepressant-effects-of-focused-ultrasound-induced-blood-brain-barrier-opening
#10
Skyler J Mooney, José N Nobrega, Anthony J Levitt, Kullervo Hynynen
In many cases, hippocampal neurogenesis appears to be a hallmark of antidepressant treatments. One novel technique for inducing this type of neurogenesis is using focused ultrasound waves, in conjunction with circulating microbubbles, to open the blood-brain-barrier. The present experiment aimed to test whether this technique has antidepressant effects in a rodent model. Rats were subjected to 1, 2 or 3 weekly treatments of magnetic resonance-guided focused ultrasound in order to open the blood-brain-barrier in the hippocampal region...
January 8, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29323044/magnetic-resonance-imaging-guided-focused-ultrasound-to-increase-localized-blood-spinal-cord-barrier-permeability
#11
Allison H Payne, Gregory W Hawryluk, Yoshimi Anzai, Henrik Odéen, Megan A Ostlie, Ethan C Reichert, Amanda J Stump, Satoshi Minoshima, Donna J Cross
Spinal cord injury (SCI) affects thousands of people every year in the USA, and most patients are left with some permanent paralysis. Therapeutic options are limited and only modestly affect outcome. To address this issue, we used magnetic resonance imaging-guided focused ultrasound (MRgFUS) as a non-invasive approach to increase permeability in the blood-spinal cord barrier (BSCB). We hypothesize that localized, controlled sonoporation of the BSCB by MRgFUS will aid delivery of therapeutics to the injury. Here, we report our preliminary findings for the ability of MRgFUS to increase BSCB permeability in the thoracic spinal cord of a normal rat model...
December 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/29317687/the-synergistic-bactericidal-effect-of-vancomycin-on-utmd-treated-biofilm-involves-damage-to-bacterial-cells-and-enhancement-of-metabolic-activities
#12
Jian Hu, Ning Zhang, Lifang Li, Ning Zhang, Yanfen Ma, Chedong Zhao, Qian Wu, Ying Li, Nianan He, Xiaoqin Wang
In this study, the synergistic effect of vancomycin, a cell wall synthesis inhibitor, and ultrasound-targeted microbubble destruction (UTMD), on cell viability of Staphylococcus epidermidis, embedded in biofilm, was investigated. Biofilms are the leading causes of antibiotic-resistant bacterial infections of medical implants and prosthetics worldwide. The antibiotic-resistant nature of biofilm-embedded pathogens poses a critical challenge to the medical community. Previously, studies have demonstrated the efficacy of using ultrasound waves and UTMD in circumventing this problem...
January 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29305924/mechanistic-understanding-the-bioeffects-of-ultrasound-driven-microbubbles-to-enhance-macromolecule-delivery
#13
REVIEW
Peng Qin, Tao Han, Alfred C H Yu, Lin Xu
Ultrasound-driven microbubbles can trigger reversible membrane perforation (sonoporation), open interendothelial junctions and stimulate endocytosis, thereby providing a temporary and reversible time-window for the delivery of macromolecules across biological membranes and endothelial barriers. This time-window is related not only to cavitation events, but also to biological regulatory mechanisms. Mechanistic understanding of the interaction between cavitation events and cells and tissues, as well as the subsequent cellular and molecular responses will lead to new design strategies with improved efficacy and minimized side effects...
January 3, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29301827/thy1-targeted-microbubbles-for-ultrasound-molecular-imaging-of-pancreatic-ductal-adenocarcinoma
#14
Lotfi Abou-Elkacem, Huaijun Wang, Sayan M Chowdhury, Richard H Kimura, Sunitha V Bachawal, Sanjiv S Gambhir, Lu Tian, Juergen K Willmann
PURPOSE: To engineer a dual human and murine Thy1-binding single-chain-antibody ligand (Thy1-scFv) for contrast microbubble-enhanced ultrasound molecular imaging of pancreatic ductal adenocarcinoma (PDAC). EXPERIMENTAL DESIGN:  Thy1-scFv were engineered using yeast-surface-display techniques. Binding to soluble human and murine Thy1 and to Thy1-expressing cells was assessed by flow cytometry. Thy1-scFv was then attached to gas-filled microbubbles to create MB Thy1-scFv...
January 4, 2018: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/29301450/effects-of-a-microbubble-ultrasound-contrast-agent-on-high-intensity-focused-ultrasound-for-uterine-fibroids-a-randomised-controlled-trial
#15
Yan Chen, Jing Jiang, Yuhua Zeng, Xiaobing Tian, Miao Zhang, Hong Wu, Honggui Zhou
OBJECTIVE: To investigate the effects of a microbubble ultrasound contrast agent on high-intensity focused ultrasound (HIFU) treatment of uterine fibroids. METHODS: A total of 120 patients with solitary uterine fibroid were randomly assigned into Groups A, B, C and D. Patients in Groups A and B received 1.5 ml of SonoVue, Groups C and D received 1.5 ml of saline before HIFU ablation. HIFU sonication started at 6 min after administration of SonoVue or saline in Groups A and C, whereas it started at 10 min in Groups B and D...
January 4, 2018: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29290812/circulating-magnetic-microbubbles-for-localized-real-time-control-of-drug-delivery-by-ultrasonography-guided-magnetic-targeting-and-ultrasound
#16
Beata Chertok, Robert Langer
Image-guided and target-selective modulation of drug delivery by external physical triggers at the site of pathology has the potential to enable tailored control of drug targeting. Magnetic microbubbles that are responsive to magnetic and acoustic modulation and visible to ultrasonography have been proposed as a means to realize this drug targeting strategy. To comply with this strategy in vivo, magnetic microbubbles must circulate systemically and evade deposition in pulmonary capillaries, while also preserving magnetic and acoustic activities in circulation over time...
2018: Theranostics
https://www.readbyqxmd.com/read/29290810/tumour-vascular-shutdown-and-cell-death-following-ultrasound-microbubble-enhanced-radiation-therapy
#17
Ahmed El Kaffas, Mehrdad J Gangeh, Golnaz Farhat, William Tyler Tran, Amr Hashim, Anoja Giles, Gregory J Czarnota
High-dose radiotherapy effects are regulated by acute tumour endothelial cell death followed by rapid tumour cell death instead of canonical DNA break damage. Pre-treatment with ultrasound-stimulated microbubbles (USMB) has enabled higher-dose radiation effects with conventional radiation doses. This study aimed to confirm acute and longitudinal relationships between vascular shutdown and tumour cell death following radiation and USMB in a wild type murine fibrosarcoma model using in vivo imaging. Methods: Tumour xenografts were treated with single radiation doses of 2 or 8 Gy alone, or in combination with low-/high-concentration USMB...
2018: Theranostics
https://www.readbyqxmd.com/read/29290799/early-assessment-of-tumor-response-to-radiation-therapy-using-high-resolution-quantitative-microvascular-ultrasound-imaging
#18
Sandeep K Kasoji, Judith N Rivera, Ryan C Gessner, Sha X Chang, Paul A Dayton
Measuring changes in tumor volume using anatomical imaging weeks to months post radiation therapy (RT) is currently the clinical standard for indicating treatment response to RT. For patients whose tumors do not respond successfully to treatment, this approach is suboptimal as timely modification of the treatment approach may lead to better clinical outcomes. We propose to use tumor microvasculature as a biomarker for early assessment of tumor response to RT. Acoustic angiography is a novel contrast ultrasound imaging technique that enables high-resolution microvascular imaging and has been shown to detect changes in microvascular structure due to cancer growth...
2018: Theranostics
https://www.readbyqxmd.com/read/29290798/ultrasound-molecular-imaging-of-vegfr-2-in-clear-cell-renal-cell-carcinoma-tracks-disease-response-to-antiangiogenic-and-notch-inhibition-therapy
#19
Juan D Rojas, Fanglue Lin, Yun-Chen Chiang, Anna Chytil, Diana C Chong, Victoria L Bautch, W Kimryn Rathmell, Paul A Dayton
Metastatic clear-cell renal cell carcinoma (ccRCC) affects thousands of patients worldwide each year. Antiangiogenic therapy has been shown to have beneficial effects initially, but resistance is eventually developed. Therefore, it is important to accurately track the response of cancer to different therapeutics in order to appropriately adjust the therapy to maximize efficacy. Change in tumor volume is the current gold standard for determining efficacy of treatment. However, functional variations can occur much earlier than measurable volume changes...
2018: Theranostics
https://www.readbyqxmd.com/read/29287999/the-dependence-of-glomerular-capillary-hemorrhage-induced-by-contrast-enhanced-diagnostic-ultrasound-on-microbubble-diameter
#20
Douglas L Miller, Xiaofang Lu, Chunyan Dou, Mario L Fabiilli, Charles C Church
A recently proposed two-criterion model for cavitational bioeffects in tissue with microbubbles (MBs) was tested. The glomerular capillary hemorrhage bioeffect was observed in rat kidney for contrast agent MB suspensions with mean diameters of 1.6, 3.1 and 5.5 µm. A diagnostic ultrasound machine was used at 3.6 MHz and 5.5 MHz for intermittent scans at power settings 2 dB apart. Petechial hemorrhage counts scored on the surface of the kidneys, and glomeruli were scored in histology. Thresholds for the petechial hemorrhage measurements were the same for the large and medium MB suspensions but substantially higher for the small MBs...
December 26, 2017: Ultrasound in Medicine & Biology
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