The main highlights for our May issue include methods for measuring cognition in zero gravity, isolating mosquito immune cells, engineering recombinant SARS vaccines, and detecting tumors with thermal imaging. In addition, procedures for isolating neural stem cells from human fetal brain and culturing antigen-presenting liver cells will also be released.
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Kolski-Andreaco, A. May 2011: This Month in JoVE. J. Vis. Exp. (51), e3449, (2011).
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Protocol for Recombinant RBD-based SARS Vaccines: Protein Preparation, Animal Vaccination and Neutralization Detection
Lanying Du, Xiujuan Zhang, Jixiang Liu, Shibo Jiang
Lindsley F. Kimball Research Institute, New York Blood Center
This protocol describes a general procedure for studying recombinant receptor-binding domain (RBD)-based subunit vaccines against SARS. It includes methods for transfection and expression of RBD protein in 293T cells, immunization of mice with RBD and detection of neutralization activity of mouse sera using an established SARS pseudovirus neutralization assay.
Cila Herman, Muge Pirtini Cetingul
Department of Mechanical Engineering, The Johns Hopkins University
We demonstrated that malignant pigmented lesions with increased metabolic activity generate quantifiable amounts of heat and the measurement of the transient thermal response of the skin to a cooling excitation allows quantitative identification of melanoma and other skin cancers (vs. non-proliferative nevi) at an early stage of the disease.
Mehdi Kabbage, Maria Ek-Ramos, Martin Dickman
Programmed cell death assays commonly used in mammalian systems such as DNA laddering or TUNEL assays, are often difficult to reproduce in plants. In combination with a GUS reporter system, we propose a rapid, plant based transient assay to analyze the potential death properties of specific genes.
Phillip D. Zamore, Shengmei Ma
Department of Biochemistry & Molecular Pharmacology and Howard Hughes Medical Institute, University of Massachusetts Medical School
Drosophila melanogaster testes can be rapidly and efficiently isolated from adult males using dissecting needles. With practice, one can readily isolate in one or two days an amount of testes sufficient for the analysis of DNA or RNA by high throughput sequencing or more traditional molecular biology methods or of protein for antibody- or enzyme-based assays.
Patrick Maschmeyer, Melanie Flach, Florian Winau
Immune Disease Institute, Program in Cellular and Molecular Medicine at Children's Hospital, Department of Pathology, Harvard Medical School
Here we describe a method for the isolation of hepatic stellate cells from mouse liver. For stellate cell purification, mouse livers are digested in situ and in vitro by pronase-collagenase treatment prior to density gradient centrifugation. This technique yields highly pure hepatic stellate cells.
Amina A. Qayum, Aparna Telang
Department of Biology, University of Richmond
A simplified yet accurate method to collect and stain mosquito hemocytes is described. Our method combines the simplicity of perfusion with the accuracy of high injection techniques to isolate clean preparations of hemocytes in Aedes mosquitoes. This method facilitates studies requiring knowledge of the types of hemocytes and their abundance.
Vera Brümmer1, Stefan Schneider1, Heiko Strüder1, Heather Carnahan2, Chris D. Askew3
1Institute of Movement and Neurosciences, German Sport University Cologne, 2Deptartment of Surgical Skills, University of Toronto, 3University of the Sunshine Coast
The effect of weightlessness and hypergravity on both hemodynamic and electrophysiological processes in the brain is going to be followed during parabolic flight by EEG and NIRS techniques. A feasibility study of a more complex experiment, which is planned to carry out during medium- and long-term space flight.
Jie Lu1, Laurent C. Delli-Bovi2, Jonathan Hecht3, Rebecca Folkerth4, Volney L. Sheen1
1Department of Neurology, Beth Israel Deaconess Medical Center, 2Department of Obstetrics and Gynecology, Brigham and Women's Hospital, 3Department of Pathology, Beth Israel Deaconess Medical Center, 4Department of Pathology, Division of Neuropathology, Brigham and Women's Hospital
A simple and reliable method on isolation and culture of neural stem cells from discarded human fetal cortical tissue is described. Cultures derived from known human neurological disorders can be used for characterization of pathological cellular and molecular processes, as well as provide a platform to assess pharmacological efficacy.