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multiphoton imaging

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https://www.readbyqxmd.com/read/28911733/time-lapsed-large-volume-high-resolution-intravital-imaging-for-tissue-wide-analysis-of-single-cell-dynamics
#1
David Entenberg, Jessica M Pastoriza, Maja H Oktay, Sonia Voiculescu, Yarong Wang, Maria Soledad Sosa, Julio Aguirre-Ghiso, John Condeelis
Pathologists rely on microscopy to diagnose disease states in tissues and organs. They utilize both high-resolution, high-magnification images to interpret the staining and morphology of individual cells, as well as low-magnification overviews to give context and location to these cells. Intravital imaging is a powerful technique for studying cells and tissues in their native, live environment and can yield sub-cellular resolution images similar to those used by pathologists. However, technical limitations prevent the straightforward acquisition of low-magnification images during intravital imaging, and they are hence not typically captured...
September 1, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28902016/raman-microscopy-a-noninvasive-method-to-visualize-the-localizations-of-biomolecules-in-the-cornea
#2
Yuichi Kaji, Toshihiro Akiyama, Hiroki Segawa, Tetsuro Oshika, Hideaki Kano
PURPOSE: In vivo and in situ visualization of biomolecules without pretreatment will be important for diagnosis and treatment of ocular disorders in the future. Recently, multiphoton microscopy, based on the nonlinear interactions between molecules and photons, has been applied to reveal the localizations of various molecules in tissues. We aimed to use multimodal multiphoton microscopy to visualize the localizations of specific biomolecules in rat corneas. METHODS: Multiphoton images of the corneas were obtained from nonlinear signals of coherent anti-Stokes Raman scattering, third-order sum frequency generation, and second-harmonic generation...
September 7, 2017: Cornea
https://www.readbyqxmd.com/read/28894365/photothermal-ablation-of-inflammatory-breast-cancer-tumor-emboli-using-plasmonic-gold-nanostars
#3
Bridget M Crawford, Ronnie L Shammas, Andrew M Fales, David A Brown, Scott T Hollenbeck, Tuan Vo-Dinh, Gayathri R Devi
Inflammatory breast cancer (IBC) is rare, but it is the most aggressive subtype of breast cancer. IBC has a unique presentation of diffuse tumor cell clusters called tumor emboli in the dermis of the chest wall that block lymph vessels causing a painful, erythematous, and edematous breast. Lack of effective therapeutic treatments has caused mortality rates of this cancer to reach 20%-30% in case of women with stage III-IV disease. Plasmonic nanoparticles, via photothermal ablation, are emerging as lead candidates in next-generation cancer treatment for site-specific cell death...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28862343/cellular-detection-of-g-quadruplexes-by-optical-imaging-methods
#4
Souheila Amor, Sunny Y Yang, Judy M Y Wong, David Monchaud
G-quadruplexes (G4s) are higher-order nucleic acid structures that fold from guanine (G)-rich DNA and RNA strands. This field of research gains traction as a major chemical biology area since it aims at uncovering many key cellular mechanisms in which quadruplexes are involved. The wealth of knowledge acquired over the past three decades strongly supports pivotal roles of G4 in the regulation of gene expression at both transcriptional (DNA quadruplexes) and translational levels (RNA quadruplexes). Recent biochemical discoveries uncovered myriad of additional G4 actions: from chromosomal stability to the firing of replication origins, from telomere homeostasis to functional dysregulations underlying genetic diseases (including cancers and neurodegeneration)...
September 1, 2017: Current Protocols in Cell Biology
https://www.readbyqxmd.com/read/28858435/in-vivo-multiphoton-microscopy-using-a-handheld-scanner-with-lateral-and-axial-motion-compensation
#5
Ben Sherlock, Sean C Warren, Yuriy Alexandrov, Fei Yu, James Stone, Jonathan Knight, Mark A A Neil, Carl Paterson, Paul M W French, Chris Dunsby
This paper reports a handheld multiphoton fluorescence microscope designed for clinical imaging that incorporates axial motion compensation and lateral image stabilization. Spectral domain optical coherence tomography is employed to track the axial position of the skin surface, and lateral motion compensation is realised by imaging the speckle pattern arising from the optical coherence tomography beam illuminating the sample. Our system is able to correct lateral sample velocities of up to ~65 μm s(-1) . Combined with the use of negative curvature microstructured optical fibre to deliver tunable ultrafast radiation to the handheld multiphoton scanner without the need of a dispersion compensation unit, this instrument has potential for a range of clinical applications...
August 31, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28856032/optimizing-pulse-compressibility-in-completely-all-fibered-ytterbium-chirped-pulse-amplifiers-for-in-vivo-two-photon-laser-scanning-microscopy
#6
A Fernández, L Grüner-Nielsen, M Andreana, M Stadler, S Kirchberger, C Sturtzel, M Distel, L Zhu, W Kautek, R Leitgeb, A Baltuska, K Jespersen, A Verhoef
A simple and completely all-fiber Yb chirped pulse amplifier that uses a dispersion matched fiber stretcher and a spliced-on hollow core photonic bandgap fiber compressor is applied in nonlinear optical microscopy. This stretching-compression approach improves compressibility and helps to maximize the fluorescence signal in two-photon laser scanning microscopy as compared with approaches that use standard single mode fibers as stretcher. We also show that in femtosecond all-fiber systems, compensation of higher order dispersion terms is relevant even for pulses with relatively narrow bandwidths for applications relying on nonlinear optical effects...
August 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28846081/microglia-turnover-with-aging-and-in-an-alzheimer-s-model-via-long-term-in-vivo-single-cell-imaging
#7
Petra Füger, Jasmin K Hefendehl, Karthik Veeraraghavalu, Ann-Christin Wendeln, Christine Schlosser, Ulrike Obermüller, Bettina M Wegenast-Braun, Jonas J Neher, Peter Martus, Shinichi Kohsaka, Martin Thunemann, Robert Feil, Sangram S Sisodia, Angelos Skodras, Mathias Jucker
To clarify the role of microglia in brain homeostasis and disease, an understanding of their maintenance, proliferation and turnover is essential. The lifespan of brain microglia, however, remains uncertain, and reflects confounding factors in earlier assessments that were largely indirect. We genetically labeled single resident microglia in living mice and then used multiphoton microscopy to monitor these cells over time. Under homeostatic conditions, we found that neocortical resident microglia were long-lived, with a median lifetime of well over 15 months; thus, approximately half of these cells survive the entire mouse lifespan...
August 28, 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28839271/smartscope2-simultaneous-imaging-and-reconstruction-of-neuronal-morphology
#8
Brian Long, Zhi Zhou, Ali Cetin, Jonathan Ting, Ryder Gwinn, Bosiljka Tasic, Tanya Daigle, Ed Lein, Hongkui Zeng, Peter Saggau, Michael Hawrylycz, Hanchuan Peng
Quantitative analysis of neuronal morphology is critical in cell type classification and for deciphering how structure gives rise to function in the brain. Most current approaches to imaging and tracing neuronal 3D morphology are data intensive. We introduce SmartScope2, the first open source, automated neuron reconstruction machine integrating online image analysis with automated multiphoton imaging. SmartScope2 takes advantage of a neuron's sparse morphology to improve imaging speed and reduce image data stored, transferred and analyzed...
August 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28838859/transmural-variation-in-elastin-fiber-orientation-distribution-in-the-arterial-wall
#9
Xunjie Yu, Yunjie Wang, Yanhang Zhang
The complex three-dimensional elastin network is a major load-bearing extracellular matrix (ECM) component of an artery. Despite the reported anisotropic behavior of arterial elastin network, it is usually treated as an isotropic material in constitutive models. Our recent multiphoton microscopy study reported a relatively uniform elastin fiber orientation distribution in porcine thoracic aorta when imaging from the intima side (Chow et al., 2014). However it is questionable whether the fiber orientation distribution obtained from a small depth is representative of the elastin network structure in the arterial wall, especially when developing structure-based constitutive models...
August 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28836304/impaired-microglia-process-dynamics-post-stroke-are-specific-to-sites-of-secondary-neurodegeneration
#10
Murielle G Kluge, Laura Kracht, Mahmoud Abdolhoseini, Lin Kooi Ong, Sarah J Johnson, Michael Nilsson, Frederick R Walker
Stroke induces tissue death both at the site of infarction and at secondary sites connected to the primary infarction. This latter process has been referred to as secondary neurodegeneration (SND). Using predominantly fixed tissue analyses, microglia have been implicated in regulating the initial response at both damage sites post-stroke. In this study, we used acute slice based multiphoton imaging, to investigate microglia dynamic process movement in mice 14 days after a photothrombotic stroke. We evaluated the baseline motility and process responses to locally induced laser damage in both the peri-infarct (PI) territory and the ipsilateral thalamus, a major site of post-stroke SND...
August 24, 2017: Glia
https://www.readbyqxmd.com/read/28827843/the-passive-biomechanics-of-human-pelvic-collecting-lymphatic-vessels
#11
Dimitrios Athanasiou, Lowell T Edgar, Mohammad Jafarnejad, Katherine Nixon, Delfim Duarte, Edwin D Hawkins, Samira Jamalian, Paula Cunnea, Cristina Lo Celso, Shunichi Kobayashi, Christina Fotopoulou, James E Moore
The lymphatic system has a major significance in the metastatic pathways in women's cancers. Lymphatic pumping depends on both extrinsic and intrinsic mechanisms, and the mechanical behavior of lymphatic vessels regulates the function of the system. However, data on the mechanical properties and function of human lymphatics are lacking. Our aim is to characterize, for the first time, the passive biomechanical behavior of human collecting lymphatic vessels removed at pelvic lymph node dissection during primary debulking surgeries for epithelial ovarian cancer...
2017: PloS One
https://www.readbyqxmd.com/read/28815554/severe-disruption-and-disorganization-of-dermal-collagen-fibrils-in-early-striae-gravidarum
#12
F Wang, K Calderone, T T Do, N R Smith, Y R Helfrich, T R B Johnson, S Kang, J J Voorhees, G J Fisher
BACKGROUND: Striae gravidarum (SG), or stretch marks of pregnancy, begin as erythematous streaks, and mature into hypopigmented atrophic bands. OBJECTIVES: To investigate molecular alterations that may promote atrophy of SG, we investigated dermal type I collagen fibrils, which provide human skin with support. METHODS: We obtained skin samples of recently developed, erythematous abdominal SG from pregnant women. To examine the organization of collagen fibrils, second-harmonic generation imaging was performed using multiphoton microscopy...
August 17, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28810820/quantitative-label-free-evaluation-of-tissue-engineered-skeletal-muscle-through-multiphoton-microscopy
#13
Brian C Syverud, Mary-Ann Mycek, Lisa Marie Larkin
The lack of tools for assessing engineered tissue viability and function in a non-invasive manner is a major regulatory and translational challenge facing tissue engineers. Label-free, nonlinear optical molecular imaging (OMI) has utilized endogenous nicotinamide adenine dinucleotide (NADH) and flavin adenine dinucleotide (FAD) fluorescence to indicate metabolic activity. Similarly, second harmonic generation (SHG) signals from myosin and collagen can measure overall muscle structural integrity and function...
August 16, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28800705/two-photon-imaging-of-3d-organization-of-bimetallic-auag-nanoclusters-in-dna-matrix
#14
Katarzyna Brach, Magdalena Waszkielewicz, Joanna Olesiak-Banska, Marek Samoc, Katarzyna Matczyszyn
We report on two-photon excitation properties of small silver-doped gold nanoclusters (AuAgNCs) and on their three-dimensional arrangement in a hybrid system composed of DNA liquid crystals (LCs) and AuAgNCs. UV-vis and fluorescence spectroscopy, transmission electron microscopy (TEM), and multiphoton excitation spectroscopy were used to characterize the nanoparticles. We show that AuAgNCs exhibit two-photon excited luminescence (2PL) emission and second-harmonic generation (SHG) and that these properties remain the same in liquid crystalline matrix...
August 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28798204/imaging-igf-i-uptake-in-growth-plate-cartilage-using-in-vivo-multiphoton-microscopy
#15
Maria A Serrat, Gabriela Ion
Bones elongate through endochondral ossification in cartilaginous growth plates located at ends of primary long bones. Linear growth ensues from a cascade of biochemical signals initiated by actions of systemic and local regulators on growth plate chondrocytes. Although cellular processes are well defined, there is a fundamental gap in understanding how growth regulators are physically transported from surrounding blood vessels into and through dense, avascular cartilage matrix. Intravital imaging using in vivo multiphoton microscopy is one promising strategy to overcome this barrier by quantitatively tracking molecular delivery to cartilage from the vasculature in real time...
August 10, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28769787/a-combination-of-ex-vivo-diffusion-mri-and-multiphoton-to-study-microglia-monocytes-alterations-after-spinal-cord-injury
#16
Harun N Noristani, Hassan Boukhaddaoui, Guillaume Saint-Martin, Pauline Auzer, Rahima Sidiboulenouar, Nicolas Lonjon, Eric Alibert, Nicolas Tricaud, Christophe Goze-Bac, Christophe Coillot, Florence E Perrin
Central nervous system (CNS) injury has been observed to lead to microglia activation and monocytes infiltration at the lesion site. Ex vivo diffusion magnetic resonance imaging (diffusion MRI or DWI) allows detailed examination of CNS tissues, and recent advances in clearing procedures allow detailed imaging of fluorescent-labeled cells at high resolution. No study has yet combined ex vivo diffusion MRI and clearing procedures to establish a possible link between microglia/monocytes response and diffusion coefficient in the context of spinal cord injury (SCI)...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28766923/comparison-of-higher-order-multiphoton-signal-generation-and-collection-at-the-1700-nm-window-based-on-transmittance-measurement-of-objective-lenses
#17
Wenhui Wen, Yuxin Wang, Hongji Liu, Kai Wang, Ping Qiu, Ke Wang
One benefit of excitation at the 1700-nm window is the more accessible modalities of multiphoton signal generation. It is demonstrated here that the transmittance performance of the objective lens is of vital importance for efficient higher-order multiphoton signal generation and collection excited at the 1700-nm window. Two commonly used objective lenses for multiphoton microscopy (MPM) are characterized and compared, one with regular coating and the other with customized coating for high transmittance at the 1700-nm window...
August 2, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28761050/non-labeling-multiphoton-excitation-microscopy-as-a-novel-diagnostic-tool-for-discriminating-normal-tissue-and-colorectal-cancer-lesions
#18
Takahiro Matsui, Hiroki Mizuno, Takao Sudo, Junichi Kikuta, Naotsugu Haraguchi, Jun-Ichiro Ikeda, Tsunekazu Mizushima, Hirofumi Yamamoto, Eiichi Morii, Masaki Mori, Masaru Ishii
Multiphoton excitation microscopy (MPM) is regarded as an effective tool that enables the visualization of deep regions within living tissues and organs, with little damage. Here, we report novel non-labeling MPM (NL-MPM) imaging of fresh human colorectal mucosa, which is useful for discriminating cancer lesions from normal tissues quantitatively without any need for resection, fixation, or staining. Using NL-MPM, we visualized three components in human colorectal mucosa, epithelial cells, immune cells, and basement membranes, based on their characteristic patterns of fluorescence...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28751194/biaxial-loading-of-arterial-tissues-with-3d-in-situ-observations-of-adventitia-fibrous-microstructure-a-method-coupling-multi-photon-confocal-microscopy-and-bulge-inflation-test
#19
Cristina Cavinato, Clementine Helfenstein-Didier, Thomas Olivier, Sabine Rolland du Roscoat, Norbert Laroche, Pierre Badel
Disorders in the wall microstructure underlie all forms of vascular disease, such as the aortic aneurysm, the rupture of which is necessarily triggered at the microscopic level. In this context, we developed an original experimental approach, coupling a bulge inflation test to multiphoton confocal microscopy, for visualizing the 3D micro-structure of porcine, human non-aneurysmal and aneurysmal aortic adventitial collagen under increasing pressurization. The experiment complexity on such tissues led to deeply address the acquisition major hurdles...
October 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28727765/defining-the-target-and-the-effect-of-imatinib-on-the-filarial-c-abl-homologue
#20
Elise M O'Connell, Olena Kamenyeva, Sara Lustigman, Aaron Bell, Thomas B Nutman
BACKGROUND: Previously we demonstrated the micro- and macrofilaricidal properties of imatinib in vitro. Here we use electron and multiphoton microscopy to define the target of imatinib in the adult and microfilarial stages of Brugia malayi and assess the effects of pharmacologically relevant levels of imatinib on the adult parasites. METHODS: After fixation of adult B. malayi males and females, sections were stained with polyclonal rabbit anti-c-Abl antibody (or isotype control) and imaged with multiphoton fluorescent microscopy...
July 2017: PLoS Neglected Tropical Diseases
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