<h2 class="jove_title"><a href="https://www.jove.com/video/53174">Generation of Integration-free Human Induced Pluripotent Stem Cells Using Hair-derived Keratinocytes</a></h2>Sandy S.C. Hung, Alice P&#233;bay, Raymond C.B. WongCentre for Eye Research Australia &amp; Department of Ophthalmology, University of MelbourneThis manuscript provides a step-by-step procedure for the derivation and maintenance of human keratinocytes from plucked hair and subsequent generation of integration-free human induced pluripotent stem cells (hiPSCs) by episomal vectors. <h2 class="jove_title"><a href="https://www.jove.com/video/53271">Epithelial Cell Repopulation and Preparation of Rodent Extracellular Matrix Scaffolds for Renal Tissue Development</a></h2>Joseph S. Uzarski1,2, Jimmy Su1,2,3,4, Yan Xie1,2, Zheng Jenny Zhang1,2, Heather H. Ward5, Angela Wandinger-Ness6, William M. Miller7,8, Jason A. Wertheim1,2,3,4,8,91Comprehensive Transplant Center, Feinberg School of Medicine, Northwestern University, 2Department of Surgery, Feinberg School of Medicine, Northwestern University, 3Department of Biomedical Engineering, Northwestern University, 4Simpson Querrey Institute for BioNanotechnology in Medicine, Northwestern University, 5Department of Internal Medicine, University of New Mexico HSC, 6Department of Pathology, University of New Mexico HSC, 7Department of Chemical and Biological Engineering, Northwestern University, 8Chemistry of Life Processes Institute, Northwestern University, 9Department of Surgery, Jesse Brown VA Medical CenterThis protocol describes decellularization of Sprague Dawley rat kidneys by antegrade perfusion of detergents through the vasculature, producing acellular renal extracellular matrices that serve as templates for repopulation with human renal epithelial cells. Recellularization and use of the resazurin perfusion assay to monitor growth is performed within specially-designed perfusion bioreactors.<h2 class="jove_title"><a href="https://www.jove.com/video/52898">A Treatment Package without Escape Extinction To Address Food Selectivity</a></h2>Jessica Weber1, Anibal Gutierrez, Jr.21Florida International University, 2Department of Psychology and the Center for Children and Families, Florida International UniversityFeeding difficulties are a common problem for children with developmental disorders, including autism, and behavioral interventions often include escape extinction. Recent research has begun to evaluate treatments that do not include escape extinction. This manuscript describes a multicomponent treatment package that does not use escape extinction to treat feeding difficulties.<h2 class="jove_title"><a href="https://www.jove.com/video/53204">A Novel Culture Model for Human Pluripotent Stem Cell Propagation on Gelatin in Placenta-conditioned Media</a></h2>Ji-Hye Jung, Byung Soo KimDepartment of Biomedical Science, Graduate School of Medicine, Korea UniversityThis protocol provides a simple and efficient way to propagate human pluripotent stem cells (hPSCs) using only conditioned media derived from the human placenta in a gelatin-coated dish without additional exogenous supplementation or hPSC-specific synthetic substrata.

august 2015 - this month in jove: isolating stem cells, bioengineering the kidney, and getting kids to eat carrots

Here's a look at what's coming up in the <a href="http://www.jove.com/archive/102">August 2015 issue</a> of <a href="http://www.jove.com/">JoVE: The Journal of Visualized Experiments</a>.
In <a href="http://www.jove.com/devbio">JoVE Developmental Biology</a>, a major goal in stem cell research is to grow human pluripotent stem cells (hPSCs) in fully humanized conditions without using feeder cells, exogenous supplements, or synthetic substrates. This will eliminate the risk of contamination by animal cells and facilitate economical mass production for therapeutic applications. <a href="http://www.jove.com/video/53204">Jung and Kim</a> previously showed that chorionic cells from the human placenta could support the propagation of hPSCs. So this month, they isolate and culture placental chorionic cells and use the placenta-conditioned media to culture the hPSCs. The result is an almost completely humanized culture system that can advance stem cell research and regenerative medicine.
Also in <a href="http://www.jove.com/devbio">JoVE Developmental Biology</a>, the ability to genetically reprogram differentiated cells into stem-like states has revolutionized the field of regenerative medicine. Induced pluripotent stem cells (iPSCs) can be derived from many different cell types, including lymphocytes from whole blood and keratinocytes from skin samples. But these require pretty invasive extraction methods, so <a href="http://www.jove.com/video/53174">Hung et al.</a> focus on the keratinocytes from hair follicles, which can be harvested simply by plucking a few hairs. Our authors culture the follicles to isolate keratinocytes, and transfect them with non-viral episomal vectors to produce iPSCs. These could be used for disease modeling and for deriving patient-specific stem cells.
<a href="http://www.jove.com/bioengineering">JoVE Bioengineering</a> also applies to regenerative medicine with a protocol by <a href="http://www.jove.com/video/53271">Uzarski et al.</a> for bioengineering kidney tissues. This involves carefully removing the cells from kidneys by perfusion. The decellularized tissue retains much of the kidney's intricate structure, so it serves a biological scaffold for new renal cells. The kidney scaffolds are recellularized with human renal cells, which repopulate the matrix, proliferate, and survive in perfusion culture for over a week. With a shortage of donor kidneys available for transplantation, patients with renal failure may benefit from kidney grafts made from their own cells.
In <a href="http://www.jove.com/behavior">JoVE Behavior</a>, feeding disorders are common in young children, especially those with developmental delays. So <a href="http://www.jove.com/video/52898">Weber and Gutierrez</a> demonstrate a treatment protocol that includes three different procedures for presenting foods: One procedure involves several successive steps that approximate eating. In another, preferred foods are always placed on the left side. This is designed to foster compliance with foods served on the left. In the third procedure, the non-preferred food is placed on top of the preferred one, and always served from the left. Parents, teachers, and clinicians can try this simple protocol before seeking more specialized treatment.
You've just had a sneak peek of the <a href="http://www.jove.com/archive/102">August 2015 issue</a> of <a href="http://www.jove.com/">JoVE</a>. Visit the website to see the full-length articles, plus many more, in <a href="http://www.jove.com/">JoVE: The Journal of Visualized Experiments</a>.

Watch this Scientific Journal Video about August 2015 - This Month in JoVE: Isolating Stem Cells, Bioengineering the Kidney, and Getting Kids to eat Carrots at JoVE.com

August 2015 - This Month in JoVE: Isolating Stem Cells, Bioengineering the Kidney, and Getting Kids to eat Carrots

Here's a look at what's coming up in the August 2015 issue of JoVE: The Journal of Visualized Experiments.
In JoVE Developmental Biology, a major goal in ...

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August 2012: This Month in JoVE

Traditional microscopy requires lens objectives to magnify specimens, and can involve numerous optical components like additional objectives, filters, and mirrors to refract and direct light to optical sensors. The August 2012 issue of JoVE (Journal of Visualized Experiments) is marked by the third publication from the Ozcan Lab (University of California, Los Angeles) on their lens free lens-free "on-chip" microscopy platform, which they have pioneered.
Back in 2009, the Ozcan lab published their first article, which demonstrated the use of a lens-free imaging platform that could image cells within whole blood. This imaging technique involves placing a sample directly on an optoelectric sensor array, like the CCD or CMOS chips found in the standard camcorder. Then, LED illumination from above the sample casts shadows on the chip, which are recorded as digital holograms that can be subjected to image processing. Not only does this lensless imaging system allow for an extremely large field of view (FOV of 0.6-8 cm2), the lack of bulky optical components makes it excellent for microfluidic applications. The Ozcan group demonstrates this in their follow-up 2011 JoVE article, in which fluorescently labeled white blood cells are imaged within a microfluidic chip.
This August in JoVE, the Ozcan group demonstrates further advancements to their lens-free microscopy platform by applying it to tomographic imaging of the nematode, C. elegans. By changing the angle of illumination, using a motorized rotation stage, the Ozcan group shows how multiple holographic slices may be generated for a sample-which, following processing, can be combined into tomograms. The Ozcan group confirms that their 3D reconstruction of the worm is successful by citing that the pharyngeal tube, a 5-micron-thick structure, is only visible in a single slice and in a 3D reconstructed cross section.
The compact and inexpensive nature of the lens-free imaging systems - designed and assembled by the Ozcan group - make them well suited for point-of-care diagnostic applications, or even cell phone based microscopy that can be performed in the field.
At the Ernest Gallo Clinic and Research Center at University of California, San Francisco JoVE learns how to visualize morphological changes in single cells using three-dimensional fluorescence microscopy and computer analysis. In this procedure, cells are given agonist, antagonist plus agonist, or no treatment, and prepared for immunofluorescence microscopy. Three-dimensional images are acquired with the help of a two-photon laser system, and the fluorescence data are processed on the computer using Imaris and Matlab.
To demonstrate the power of this technique, our authors quantify single-cell phenotypic changes in transfected HEK293 cells. Three-dimensional morphometric analysis shows dramatic changes in cells treated with agonist. These changes are not always apparent when using conventional 2D analysis. This technique allows morphological changes in single cells to be quantified and characterized in response to pharmacologic stimuli, offering a powerful new assessment tool to the arsenal of drug discovery research.
This month, in JoVE Applied Physics, we travel to South Carolina to visit the School of Materials Science and Engineering at Clemson University. Here, researchers show us how to construct lithium batteries for laboratory research.
The basic components of a lithium coin cell are the working electrode, the lithium electrolyte, and a lithium foil counter electrode. The different components of the coin cell are carefully assembled and sealed with a crimping machine. The finished coin cell can then be characterized in a battery tester. Using their homemade coin cells, our researchers can experiment with using different materials to make the cathodes of lithium coin cells.
This month in JoVE Immunology and Infection, we head to Basel, Switzerland to witness two techniques for diagnosing helminth infections. We also see how investigators perform the shuttle run test in children, in order to assess the effects of these infections on physical fitness.
Helminths are parasitic worms that can live inside humans and animals. Many species infect the intestinal tract, and may be transmitted through soil. Our authors demonstrate the Kato-Katz technique, which is used for diagnosing several common soil-transmitted helminths. They also demonstrate the Baermann technique, which uses light to stimulate the migration of certain types of phototactic helminths out of sample preparations. The various types of helminth species can subsequently be determined based on morphology.
Our authors then demonstrate how to set up and perform a 20-meter shuttle run test for children, and to measure the impact of helminth infections on physical fitness. This method can help determine the true burden of soil-transmitted helminth infections on overall health.
This brief summary highlights but a few notable video-articles that will be released in August. We'll also feature articles that demonstrate how to express genes in the midbrain of the chick embryo, study neutrophil transmigration in parallel flow chambers lined with endothelial cells, and precisely measure proteolytic degradation of the extracellular matrix.

Traditional microscopy requires lens objectives to magnify specimens, and can involve numerous optical components like additional objectives, filters, and mirrors to refract and direct light to optical sensors. The August 2012 issue of JoVE (Journal of Visualized Experiments) is marked by the third publication from the Ozcan Lab (University of California, Los Angeles) on their lens-free "on-chip" microscopy platform, which they have pioneered.

2012年8月:本月在朱庇特

Traditional microscopy requires lens objectives to magnify specimens, and can involve numerous optical components like additional objectives, filters, and ...

科研

JoVE Journal

生物学

2012: A Year In Review

Here's a look at some of the milestones and highlights of the year 2012 in Journal of Visualized Experiments (JoVE).
At the start of 2012, JoVE reached a major milestone by publishing our 1500th article. In this publication, in JoVE Bioengineering, Yu et al. described a method for analyzing the free radical composition of cigarette smoke. This method simulated cigarette puffing with a single-port smoking device, and combined it with electron spin resonance (ESR) spectroscopy to measure the degree to which antioxidant compounds can scavenge free radicals in cigarette smoke. A possible outcome of this research is the creation of less harmful cigarettes.
JoVE Bioengineering also contained the most-viewed article of 2012. Owczarczak et al. described a method for hacking a standard inkjet printer, loading ink cartridges with a cell-suspension "bioink," and printing lines of live cells onto glass slides. The thermal inkjet printing process creates temporary pores in the cell membrane, visualized by the incorporation of fluorescently labeled actin monomers. This concept, called "bioprinting," has many potential applications in cell and tissue engineering.
Also in 2012, JoVE Bioengineering featured a protocol by Hsia et al. for isolating and purifying spider silk protein, spinning it into fibers, and assessing the fiber strength. This protocol for laboratory-scale production of spider silk, which is stronger than tensile steel, can potentially be extended to large-scale manufacturing.
In JoVE Clinical and Translational Medicine, we featured a number of articles related to stroke, one of which. In one article, M&ouml;bius-Winkler et al. demonstrated placement of the WATCHMAN left atrial appendage occlusion device from Boston Scientific. This device is designed to prevent strokes by trapping clots within the left atrial appendage of the heart before they exit. Our authors demonstrated how to insert the guide wire through the femoral artery into the heart, advance the device into the left atrium, and deploy the device in the left atrial appendage.
Another article focused on stroke, Hamel et al. described the use of a driving simulator to study how patients compensate for visual field defects following stroke. By analyzing the compensatory gaze behavior of patients as they navigated through virtual driving courses with varying degrees of complexity, our authors see great potential for the use of driving simulators in stroke rehabilitation.
In JoVE Immunology and Infection, we published an article by Keyel et al. describing the real-time kinetics of immune cell responses to bacterial toxins using live cell microscopy. Combined with high-speed 3D confocal microscopy, this technique can also visualize the cellular repair response.
Also in JoVE Immunology and Infection, we featured an article by Yap et al. describing methods for diagnosing helminth infections in children. Helminths are parasitic worms that can infect the intestinal tract of humans and animals, and may be distinguished based on their morphology. The same article demonstrated how to measure the impact of helminth infections on physical fitness in children, which is a measure of overall health.
In JoVE Neuroscience, we featured a method by Hoffmann et al., who used tiny headphones to alter the auditory feedback in songbirds, and analyzed the computational and neurophysiological basis of vocal learning in birds when they adjust their singing in response to altered acoustic signals.
Also in JoVE Neuroscience, we moved from birds to bees with a method that assesses associative and non-associative tactile learning in honeybees. This method, by Mujagi&#263; et al., allowed bees to scan different metal surfaces with their antennae, then conditioned them to expect sugar water when their antennae touched particular surfaces, and analyzed the corresponding changes in antennal movement.
In 2012, we launched a brand-new section: JoVE Applied Physics, which features articles on subjects ranging from plasma physics to material science. The Applied Physics section also contained JoVE's 2000th video article, filmed in a synchrotron radiation facility, where Borisenko et al. showed how to determine the electronic structure of complex materials using angle-resolved photoemission spectroscopy.
In the JoVE General section, we published an article by Artioli et al. demonstrating the use of a portable gas analyzer to measure oxygen consumption during complex exercise - such as judo. By analyzing oxygen consumption and collecting blood for measuring plasma lactate concentration, this method can determine the relative contributions of different energy systems to specific aspects of complex exercise.
Finally, JoVE followed Dolhi et al. to a permanently ice-covered saline lake in Antarctica. There, scientists drilled through the ice to study single-celled microorganisms called protists that live in the harsh conditions of Antarctica.
This Year in Review was just a brief glimpse of a few of over 600 video articles that JoVE offered in 2012. Browse the JoVE archives to see thousands of other videos, and stay tuned for what's coming up this year in JoVE: The Journal of Visualized Experiments.

Here's a look at some of the milestones and highlights of the year 2012 in Journal of Visualized Experiments (JoVE).

2012年:年度回顾

 
 
Here's a look at some of the milestones and highlights of the year 2012 in Journal of Visualized Experiments (JoVE).
At the start of 2012, JoVE ...