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Japan Science and Technology Agency (JST)

4 ARTICLES PUBLISHED IN JoVE

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Medicine

Visualization and Analysis of Blood Flow and Oxygen Consumption in Hepatic Microcirculation: Application to an Acute Hepatitis Model
Kosuke Tsukada 1, Makoto Suematsu 2,3
1Department of Applied Physics and Physico-Informatics, Keio University, 2Department of Biochemistry, School of Medicine, Keio University, 3Exploratory Research for Advanced Technology (ERATO), Suematsu Gas Biology Project, Japan Science and Technology Agency (JST)

An optical system was developed to visualize hepatic microcirculation with FITC-labeled erythrocytes and to measure the partial pressure of oxygen in the microvessels with laser-assisted phosphorimetry. This method can be used to investigate physiological and pathological mechanisms by analyzing microvascular structure, diameter, blood flow velocity, and oxygen tension.

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Neuroscience

Quadruple Immunostaining of the Olfactory Bulb for Visualization of Olfactory Sensory Axon Molecular Identity Codes
Naoki Ihara 1, Yuji Ikegaya 1,2, Haruki Takeuchi 1,3
1Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 2Center for Information and Neural Networks, National Institute of Information and Communications Technology, 3PRESTO, Japan Science and Technology Agency (JST)

Olfactory sensory neurons express a wide variety of axon-sorting molecules to establish proper neural circuitry. This protocol describes an immunohistochemical staining method to visualize combinatorial expressions of axon-sorting molecules at the axon termini of olfactory sensory neurons.

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Biology

Real-time In Vivo Recording of Arabidopsis Calcium Signals During Insect Feeding Using a Fluorescent Biosensor
Thomas R. Vincent 1, James Canham 1, Masatsugu Toyota 2,3,4, Marieta Avramova 1, Sam T. Mugford 5, Simon Gilroy 2, Anthony J. Miller 1, Saskia Hogenhout 5, Dale Sanders 1
1Department of Metabolic Biology, John Innes Centre, Norwich Research Park, 2Department of Botany, University of Wisconsin, Madison, 3Department of Biochemistry and Molecular Biology, Saitama University, 4Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), 5Department of Cell and Developmental Biology, John Innes Centre, Norwich Research Park

This protocol outlines a simple method for analyzing calcium signals in plants generated by feeding hemipteran insects, such as aphids. Arabidopsis thaliana transformed with the GFP calcium biosensor GCaMP3 allow for the real-time in vivo imaging of calcium dynamics with a high temporal and spatial resolution.

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JoVE Journal

Wide-Field, Real-Time Imaging of Local and Systemic Wound Signals in Arabidopsis
Takuya Uemura 1, Jiaqi Wang 1, Yuri Aratani 1, Simon Gilroy 2, Masatsugu Toyota 1,2
1Department of Biochemistry and Molecular Biology, Saitama University, 2Department of Botany, University of Wisconsin

Extracellular glutamate-triggered systemic calcium signaling is critical for the induction of plant defense responses to mechanical wounding and herbivore attack in plants. This article describes a method to visualize the spatial and temporal dynamics of both these factors using Arabidopsis thaliana plants expressing calcium- and glutamate-sensitive fluorescent biosensors.

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