Yokohama City University View Institution's Website 4 articles published in JoVE Neuroscience Presynapse Formation Assay Using Presynapse Organizer Beads and “Neuron Ball” Culture Shumaia Parvin1, Renoma Takeda1, Yukio Sasaki1 1Functional Structure Biology Laboratory, Department of Medical Life Science, Yokohama City University Graduate School of Medical Life Science Presynapse formation is a dynamic process including accumulation of synaptic proteins in proper order. In this method, presynapse formation is triggered by beads conjugated with a presynapse organizer protein on axonal sheets of “neuron ball” culture, so that accumulation of synaptic proteins is easy to be analyzed during presynapse formation. Medicine Generating a Murine Orthotopic Metastatic Breast Cancer Model and Performing Murine Radical Mastectomy Eriko Katsuta1, Masanori Oshi1, Omar M. Rashid2,3,4,5, Kazuaki Takabe1,6,7,8,9,10 1Breast Surgery, Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, 2Holy Cross Hospital Michael and Dianne Bienes Comprehensive Cancer Center, 3Department of Surgery, Massachusetts General Hospital, 4Department of Surgery, University of Miami Miller School of Medicine, 5Department of Surgery, Nova Southeastern University School of Medicine, 6Department of Surgery, University at Buffalo Jacobs School of Medicine and Biomedical Sciences, 7Department of Breast Surgery and Oncology, Tokyo Medical University, 8Department of Surgery, Yokohama City University, 9Department of Surgery, Niigata University Graduate School of Medical and Dental Sciences, 10Department of Surgery, Fukushima Medical University We introduce a murine orthotopic breast cancer model and radical mastectomy model with bioluminescence technology to quantify the tumor burden to mimic human breast cancer progression. Medicine Generation of a Humanized Mouse Liver Using Human Hepatic Stem Cells Ran-Ran Zhang*1, Yun-Wen Zheng*1,2,3, Hideki Taniguchi1 1Department of Regenerative Medicine, Graduate School of Medicine, Yokohama City University, 2Department of Advanced Gastroenterological Surgical Science and Technology, Faculty of Medicine, University of Tsukuba, 3Regenerative Medicine Research Center, Jiangsu University Hospital Here, we present a novel humanized mouse liver model generated in Alb-toxin receptor mediated cell knockout (TRECK)/SCID mice following the transplantation of immature and expandable human hepatic stem cells. Biology Concentration of Metabolites from Low-density Planktonic Communities for Environmental Metabolomics using Nuclear Magnetic Resonance Spectroscopy R. Craig Everroad*1, Seiji Yoshida*2, Yuuri Tsuboi1, Yasuhiro Date3, Jun Kikuchi2,3,4, Shigeharu Moriya1,2 1Biosphere Oriented Biology Research Unit, RIKEN Advanced Science Institute, 2Graduate School of Nanobioscience, Yokohama City University, 3Advanced NMR Metabomics Research Team, RIKEN Plant Science Center, 4Graduate School of Bioagricultural Science, Nagoya University A method for metabolite extraction from microbial planktonic communities is presented. Whole community sampling is achieved by filtration onto specially prepared filters. After lyophilization, aqueous-soluble metabolites are extracted. This approach allows for application of environmental metabolomics to trans-omics investigations of natural or experimental microbial communities.