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Two photon microscopy

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https://www.readbyqxmd.com/read/29332212/measurement-of-cl-i-unaffected-by-the-cell-volume-change-using-mqae-based-two-photon-microscopy-in-airway-ciliary-cells-of-mice
#1
Yukiko Ikeuchi, Haruka Kogiso, Shigekuni Hosogi, Saori Tanaka, Chikao Shimamoto, Toshio Inui, Takashi Nakahari, Yoshinori Marunaka
MQAE is a 'non-ratiometric' chloride ion (Cl-)-quenched fluorescent indicator that is used to determine intracellular Cl- concentration ([Cl-]i). MQAE-based two-photon microscopy is reported to be a useful method to measure [Cl-]i, but it is still controversial because a change in cell volume may alter the MQAE concentration, leading to a change in the fluorescence intensity without any change in [Cl-]i. In an attempt to elucidate the effect or lack of effect of cell volume on MQAE concentration, we studied the effects of changes in cell volume, achieved by applying different levels of osmotic stress, on the intensity of MQAE fluorescence in airway ciliary cells...
January 13, 2018: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/29331450/mapping-stimulus-feature-selectivity-in-macaque-v1-by-two-photon-ca2-imaging-encoding-model-analysis-of-fluorescence-responses-to-natural-movies
#2
REVIEW
Koji Ikezoe, Mahya Amano, Shinji Nishimoto, Ichiro Fujita
In vivo calcium (Ca2+) imaging using two-photon microscopy allows activity to be monitored simultaneously from hundreds of individual neurons within a local population. While this allows us to gain important insights into how cortical neurons represent sensory information, factors such as photo-bleaching of the Ca2+ indicator limit imaging duration (and thus the numbers of stimuli that can be tested), which in turn hampers the full characterization of neuronal response properties. Here, we demonstrate that using an encoding model combined with presentation of natural movies results in detailed characterization of receptive field (RF) properties despite the relatively short time for data collection...
January 10, 2018: NeuroImage
https://www.readbyqxmd.com/read/29328524/self-healing-inside-apbbr3-halide-perovskite-crystals
#3
Davide Raffaele Ceratti, Yevgeny Rakita, Lorenzo Cremonesi, Ron Tenne, Vyacheslav Kalchenko, Michael Elbaum, Dan Oron, Marco Alberto Carlo Potenza, Gary Hodes, David Cahen
Self-healing, where a modification in some parameter is reversed with time without any external intervention, is one of the particularly interesting properties of halide perovskites. While there are a number of studies showing such self-healing in perovskites, they all are carried out on thin films, where the interface between the perovskite and another phase (including the ambient) is often a dominating and interfering factor in the process. Here, self-healing in perovskite (methylammonium, formamidinium, and cesium lead bromide (MAPbBr3 , FAPbBr3 , and CsPbBr3 )) single crystals is reported, using two-photon microscopy to create damage (photobleaching) ≈110 µm inside the crystals and to monitor the recovery of photoluminescence after the damage...
January 12, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29328187/kilohertz-binary-phase-modulator-for-pulsed-laser-sources-using-a-digital-micromirror-device
#4
Maximilian Hoffmann, Ioannis N Papadopoulos, Benjamin Judkewitz
The controlled modulation of an optical wavefront is required for aberration correction, digital phase conjugation, or patterned photostimulation. For most of these applications, it is desirable to control the wavefront modulation at the highest rates possible. The digital micromirror device (DMD) presents a cost-effective solution to achieve high-speed modulation and often exceeds the speed of the more conventional liquid crystal spatial light modulator but is inherently an amplitude modulator. Furthermore, spatial dispersion caused by DMD diffraction complicates its use with pulsed laser sources, such as those used in nonlinear microscopy...
January 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29327084/bace1-inhibition-more-effectively-suppresses-initiation-than-progression-of-%C3%AE-amyloid-pathology
#5
Finn Peters, Hazal Salihoglu, Eva Rodrigues, Etienne Herzog, Tanja Blume, Severin Filser, Mario Dorostkar, Derya R Shimshek, Nils Brose, Ulf Neumann, Jochen Herms
BACE1 is the rate-limiting protease in the production of synaptotoxic β-amyloid (Aβ) species and hence one of the prime drug targets for potential therapy of Alzheimer's disease (AD). However, so far pharmacological BACE1 inhibition failed to rescue the cognitive decline in mild-to-moderate AD patients, which indicates that treatment at the symptomatic stage might be too late. In the current study, chronic in vivo two-photon microscopy was performed in a transgenic AD model to monitor the impact of pharmacological BACE1 inhibition on early β-amyloid pathology...
January 11, 2018: Acta Neuropathologica
https://www.readbyqxmd.com/read/29318096/a-two-photon-ratiometric-fluorescent-probe-for-imaging-of-hydrogen-peroxide-levels-in-rat-organ-tissues
#6
Chang Su Lim, Myoung Ki Cho, Mi Yeon Park, Hwan Myung Kim
Hydrogen peroxide (H2O2) is important in the regulation of a variety of biological processes and is involved in various diseases. Quantitative measurement of H2O2 levels at the subcellular level is important for understanding its positive and negative effects on biological processes. Herein, a two-photon ratiometric fluorescent probe (SHP-Cyto) with a boronate-based carbamate leaving group as the H2O2 reactive trigger and 6-(benzo[d]thiazol-2'-yl)-2-(N,N-dimethylamino) naphthalene (BTDAN) as the fluorophore was synthesized and examined for its ability to detect cytosolic H2O2 in situ...
January 2018: ChemistryOpen
https://www.readbyqxmd.com/read/29314709/a-frequency-domain-non-contact-photoacoustic-microscope-based-on-an-adaptive-interferometer
#7
Deepu George, Harriet Lloyd, Ronald H Silverman, Parag V Chitnis
A frequency-domain, non-contact approach to photoacoustic microscopy (PAM) that employs amplitude-modulated (0.1-1 MHz) laser for excitation (638-nm pump) in conjunction with a two-wave mixing interferometer (532-nm probe) for non-contact detection of photoacoustic waves at the specimen surface is presented. A lock-in amplifier is employed to detect the photoacoustic signal. Illustrative images of tissue-mimicking phantoms, red-blood cells, and retinal vasculature are presented. Single-frequency modulation of the pump beam directly provides an image that is equivalent to the two-dimensional projection of the image volume...
January 5, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/29311694/intravital-mucosal-imaging-of-cd8-resident-memory-t-cells-shows-tissue-autonomous-recall-responses-that-amplify-secondary-memory
#8
Lalit K Beura, Jason S Mitchell, Emily A Thompson, Jason M Schenkel, Javed Mohammed, Sathi Wijeyesinghe, Raissa Fonseca, Brandon J Burbach, Heather D Hickman, Vaiva Vezys, Brian T Fife, David Masopust
CD8+ T cell immunosurveillance dynamics influence the outcome of intracellular infections and cancer. Here we used two-photon intravital microscopy to visualize the responses of CD8+ resident memory T cells (TRM cells) within the reproductive tracts of live female mice. We found that mucosal TRM cells were highly motile, but paused and underwent in situ division after local antigen challenge. TRM cell reactivation triggered the recruitment of recirculating memory T cells that underwent antigen-independent TRM cell differentiation in situ...
January 8, 2018: Nature Immunology
https://www.readbyqxmd.com/read/29311489/retained-myogenic-potency-of-human-satellite-cells-from-torn-rotator-cuff-muscles-despite-fatty-infiltration
#9
Masashi Koide, Yoshihiro Hagiwara, Masahiro Tsuchiya, Makoto Kanzaki, Hiroyasu Hatakeyama, Yukinori Tanaka, Takashi Minowa, Taro Takemura, Akira Ando, Takuya Sekiguchi, Yutaka Yabe, Eiji Itoi
Rotator cuff tears (RCTs) are a common shoulder problem in the elderly that can lead to both muscle atrophy and fatty infiltration due to less physical load. Satellite cells, quiescent cells under the basal lamina of skeletal muscle fibers, play a major role in muscle regeneration. However, the myogenic potency of human satellite cells in muscles with fatty infiltration is unclear due to the difficulty in isolating from small samples, and the mechanism of the progression of fatty infiltration has not been elucidated...
2018: Tohoku Journal of Experimental Medicine
https://www.readbyqxmd.com/read/29310792/nonlinear-optical-imaging-of-extracellular-matrix-proteins
#10
Chien-Cheng Shih, Dennis M Oakley, Matthew S Joens, Robyn A Roth, James A J Fitzpatrick
Over the last 2 decades, nonlinear imaging methods such as multiharmonic imaging microscopy (MHIM) have become powerful approaches for the label-free visualization of biological structures. Multiharmonic signals are generated when an intense electromagnetic field propagates through a sample that either has a specific molecular orientation or exhibits certain physical properties. It can provide complementary morphological information when integrated with other nonlinear optical imaging techniques such as two-photon excitation (TPE)...
2018: Methods in Cell Biology
https://www.readbyqxmd.com/read/29306276/three-beam-double-stimulated-raman-scatterings
#11
Minhaeng Cho
Two-beam stimulated Raman scattering with pump and Stokes beams is manifest in both the Raman loss of the pump beam and the Raman gain of the Stokes beam, and it has been used in various label-free bioimaging applications. Here, a three-beam stimulated Raman scattering that involves pump, Stokes, and depletion beams is considered, where two stimulated Raman gain-loss processes are deliberately made to compete with each other. It is shown that the three-beam Raman scattering process can be described by coupled differential equations for the increased numbers of Stokes and depletion beam photons...
January 7, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29296508/two-photon-microscopy-imaging-of-oxidative-stress-in-human-living-erythrocytes
#12
Gohar Tsakanova, Elina Arakelova, Violetta Ayvazyan, Anna Ayvazyan, Stepan Tatikyan, Rouben Aroutiounian, Yeva Dalyan, Samvel Haroutiunian, Vasili Tsakanov, Arsen Arakelyan
Red blood cells (RBCs) are known to be the most suitable cells to study oxidative stress, which is implicated in the etiopathology of many human diseases. The goal of the current study was to develop a new effective approach for assessing oxidative stress in human living RBCs using two-photon microscopy. To mimic oxidative stress in human living RBCs, an in vitro model was generated followed by two-photon microscopy imaging. The results revealed that oxidative stress is clearly visible on the two-photon microscopy images of RBCs under oxidative stress compared to no fluorescence in controls (P<0...
December 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29296477/two-photon-laser-scanning-microscopy-with-electrowetting-based-prism-scanning
#13
Omkar D Supekar, Baris N Ozbay, Mo Zohrabi, Philip D Nystrom, Gregory L Futia, Diego Restrepo, Emily A Gibson, Juliet T Gopinath, Victor M Bright
Laser scanners are an integral part of high resolution biomedical imaging systems such as confocal or 2-photon excitation (2PE) microscopes. In this work, we demonstrate the utility of electrowetting on dielectric (EWOD) prisms as a lateral laser-scanning element integrated in a conventional 2PE microscope. To the best of our knowledge, this is the first such demonstration for EWOD prisms. EWOD devices provide a transmissive, low power consuming, and compact alternative to conventional adaptive optics, and hence this technology has tremendous potential...
December 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29291032/monitoring-neoadjuvant-therapy-responses-in-rectal-cancer-using-multimodal-nonlinear-optical-microscopy
#14
Lian-Huang Li, Zhi-Fen Chen, Xing-Fu Wang, Xing Liu, Wei-Zhong Jiang, Shuang-Mu Zhuo, Li-Wei Jiang, Guo-Xian Guan, Jian-Xin Chen
Most patients with rectal cancer have a better prognosis after receiving neoadjuvant therapy because of its remarkable curative effect. However, no device delivers real-time histopathologic information on treatment response to help clinicians tailor individual therapeutic strategies. We assessed the potential of multimodal nonlinear optical microscopy to monitor therapeutic responses, including tumoral and stromal responses. We found that two-photon excited fluorescence imaging can, without labeling, identify colloid response, inflammatory cell infiltration, vascular proliferation, and tumor regression...
December 5, 2017: Oncotarget
https://www.readbyqxmd.com/read/29290808/dosimetric-evaluation-of-radionuclides-for-vcam-1-targeted-radionuclide-therapy-of-early-brain-metastases
#15
Nadia Falzone, Nicole L Ackerman, Liset de la Fuente Rosales, Mario A Bernal, Xiaoxuan Liu, Sarah Gja Peeters, Manuel Sarmiento Soto, Aurélien Corroyer-Dulmont, Myriam Bernaudin, Elisa Grimoin, Omar Touzani, Nicola R Sibson, Katherine A Vallis
Brain metastases develop frequently in patients with breast cancer, and present a pressing therapeutic challenge. Expression of vascular cell adhesion molecule 1 (VCAM-1) is upregulated on brain endothelial cells during the early stages of metastasis and provides a target for the detection and treatment of early brain metastases. The aim of this study was to use a model of early brain metastasis to evaluate the efficacy of α-emitting radionuclides, 149Tb, 211At, 212Pb, 213Bi and 225Ac; β-emitting radionuclides, 90Y, 161Tb and 177Lu; and Auger electron (AE)-emitters 67Ga, 89Zr, 111In and 124I, for targeted radionuclide therapy (TRT)...
2018: Theranostics
https://www.readbyqxmd.com/read/29288734/17%C3%AE-estradiol-e2-promotes-growth-and-stability-of-new-dendritic-spines-via-estrogen-receptor-%C3%AE-pathway-in-intact-mouse-cortex
#16
Shaofang Wang, Jun Zhu, Tonghui Xu
The steroid hormone 17β-estradiol (E2) remodels neural circuits at the synaptic level in the mammalian hippocampus and cortex. However, the underlying mechanism of synapse dynamics remains unclear. To elucidate the mechanism, we traced individual dendritic spines on layer V pyramidal neurons of the primary sensory cortex in adult female mice under E2 intervention using two-photon in vivo imaging microscopy. We confirmed the increase of the spine density upon E2 treatment in the intact mouse cortex. Furthermore, we found that this increase is due to the promotion of spine formation and the stability of newly formed spines...
December 27, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/29288586/promoij-a-new-tool-for-automatic-three-dimensional-analysis-of-microglial-process-motility
#17
Iñaki Paris, Julie C Savage, Laura Escobar, Oihane Abiega, Steven Gagnon, Chin-Wai Hui, Marie-Ève Tremblay, Amanda Sierra, Jorge Valero
Microglia, the immune cells of the central nervous system, continuously survey the brain to detect alterations and maintain tissue homeostasis. The motility of microglial processes is indicative of their surveying capacity in normal and pathological conditions. The gold standard technique to study motility involves the use of two-photon microscopy to obtain time-lapse images from brain slices or the cortex of living animals. This technique generates four dimensionally-coded images which are analyzed manually using time-consuming, non-standardized protocols...
December 30, 2017: Glia
https://www.readbyqxmd.com/read/29287905/structural-design-of-intrinsically-fluorescent-oxysterols
#18
Lina J Nåbo, Maciej Modzel, Kathiresan Krishnan, Douglas F Covey, Hideji Fujiwara, Daniel S Ory, Maria Szomek, Himanshu Khandelia, Daniel Wüstner, Jacob Kongsted
Oxysterols are oxidized derivatives of cholesterol with many important biological functions. Trafficking of oxysterols in and between cells is not well studied, largely due to the lack of appropriate oxysterol analogs. Intrinsically fluorescent oxysterols present a new route towards direct observation of intracellular oxysterol trafficking by fluorescence microscopy. We characterize the fluorescence properties of the existing fluorescent 25-hydroxycholesterol analog 25-hydroxycholestatrienol, and propose a new probe with an extended conjugated system...
December 26, 2017: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/29287721/intravital-imaging-of-neutrophil-recruitment-in-intestinal-ischemia-reperfusion-injury
#19
Shintaro Hashimoto, Masaki Honda, Takayuki Takeichi, Masataka Sakisaka, Yasuko Narita, Daiki Yoshii, Keiichi Uto, Seisuke Sakamoto, Yukihiro Inomata
BACKGROUND: Neutrophils are known to be key players in innate immunity. Activated neutrophils induce local inflammation, which results in pathophysiologic changes during intestinal ischemia-reperfusion injury (IRI). However, most studies have been based on static assessments, and few have examined real-time intravital neutrophil recruitment. We herein report a method for imaging and evaluating dynamic changes in the neutrophil recruitment in intestinal IRI using two-photon laser scanning microscopy (TPLSM)...
January 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29283513/oblique-scanning-two-photon-light-sheet-fluorescence-microscopy-for-rapid-volumetric-imaging
#20
Younghoon Shin, Dongmok Kim, Hyuk-Sang Kwon
Light-sheet fluorescence microscopy (LSFM) is a powerful tool for biological studies because it allows for optical sectioning of dynamic samples with superior temporal resolution. However, LSFM using two orthogonally co-aligned objectives requires a special sample geometry, and volumetric imaging speed is limited due to physical sample translation. This paper describes an oblique scanning two-photon LSFM (OS-2P-LSFM) that eliminates these limitations by using a single objective near the sample and a refractive scanning-descanning system...
December 28, 2017: Journal of Biophotonics
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