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In JoVE (1)
Other Publications (3)
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Articles by George T. Eisenhoffer in JoVE
JoVE General
Imagens ao vivo de extrusão celular da epiderme de Zebrafish desenvolvimento
Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah
Células que morrem são extrudados a partir de tecidos epiteliais pela contração concertada de células vizinhas, sem interromper a função de barreira. A clareza óptica de zebrafish desenvolvimento fornece um excelente sistema de visualização de extrusão na vida epitélios. Aqui nós descrevemos métodos para induzir e extrusão imagem na epiderme zebrafish larval em resolução celular.
Other articles by George T. Eisenhoffer on PubMed
Gains in Sensitivity with a Device That Mixes Microarray Hybridization Solution in a 25-microm-thick Chamber
A microarray hybridization system that allows mixing in volumes comparable to those used by glass coverslips is presented. This system is composed of a disposable flexible lid that binds to 1 in. x 3 in. glass slides via an adhesive gasket, forming a uniform 25-microm-thick hybridization chamber. This chamber rests on a base unit for temperature control. The lid contains two air-driven bladders that continuously mix the hybridization fluid. Mixing enhances sensitivity from a typical microarray experiment 2-3-fold. Mixing is particularly effective at high spotted probe and low labeled target concentrations and overcoming local target depletion that occurs when homologous probes are spotted in close proximity. Mixing appears to be compatible with most hybridization conditions; however, mix versus no-mix control experiments should be performed. Also covered are a number of microfluidic issues related to manufacturing, filling, mixing, and packaging.
Molecular Analysis of Stem Cells and Their Descendants During Cell Turnover and Regeneration in the Planarian Schmidtea Mediterranea
In adult planarians, the replacement of cells lost to physiological turnover or injury is sustained by the proliferation and differentiation of stem cells known as neoblasts. Neoblast lineage relationships and the molecular changes that take place during differentiation into the appropriate cell types are poorly understood. Here we report the identification and characterization of a cohort of genes specifically expressed in neoblasts and their descendants. We find that genes with severely downregulated expression after irradiation molecularly define at least three discrete subpopulations of cells. Simultaneous BrdU labeling and in situ hybridization experiments in intact and regenerating animals indicate that these cell subpopulations are related by lineage. Our data demonstrate not only the ability to measure and study the in vivo population dynamics of adult stem cells during tissue homeostasis and regeneration, but also the utility of studies in planarians to broadly inform stem cell biology in adult organisms.
Formaldehyde-based Whole-mount in Situ Hybridization Method for Planarians
Whole-mount in situ hybridization (WISH) is a powerful tool for visualizing gene expression patterns in specific cell and tissue types. Each model organism presents its own unique set of challenges for achieving robust and reproducible staining with cellular resolution. Here, we describe a formaldehyde-based WISH method for the freshwater planarian Schmidtea mediterranea developed by systematically comparing and optimizing techniques for fixation, permeabilization, hybridization, and postprocessing. The new method gives robust, high-resolution labeling in fine anatomical detail, allows co-labeling with fluorescent probes, and is sufficiently sensitive to resolve the expression pattern of a microRNA in planarians. Our WISH methodology not only provides significant advancements over current protocols that make it a valuable asset for the planarian community, but should also find wide applicability in WISH methods used in other systems.
