The Journal of Visualized Experiments (JoVE) is a peer reviewed, PubMed-indexed video journal. Our mission is to increase the productivity of scientific research.

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 JoVE Immunology and Infection

A 1.5 Hour Procedure for Identification of Enterococcus Species Directly from Blood Cultures


JoVE 2616 2/10/2011

1Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Cente, 2Pasadena, CA, Southern California Permanente Medical Group, 3Detroit, Detroit Medical Center, 4Woburn, MA, AdvanDx

A rapid protocol for the direct identification of Enterococcus faecalis and other Enterococcus species from a positive blood culture using a Peptide Nucleic Acid fluorescent in situ hybridization assay (PNA FISH).

 JoVE Immunology and Infection

One-day Workflow Scheme for Bacterial Pathogen Detection and Antimicrobial Resistance Testing from Blood Cultures


JoVE 3254 7/09/2012

1Department of Medical Microbiology, Maastricht University Medical Center, 2Department of Internal Medicine, Erasmus Medical Center

The design of a straightforward one-day workflow scheme for bacterial pathogen diagnostics enables the rapid recognition of bloodstream infections. The inclusion of eight clinically relevant bacterial targets and their antibiotic resistance profiles offers the clinician an initial insight on the same day, which can lead to more adequate therapy.

 JoVE Immunology and Infection

A Functional Whole Blood Assay to Measure Viability of Mycobacteria, using Reporter-Gene Tagged BCG or M.Tb (BCG lux/M.Tb lux)


JoVE 3332 9/14/2011

1Department of Paediatrics, Imperial College London, 2Centre for Health Sciences, Barts & The London School of Medicine and Dentistry

We describe an alternative approach to the enumeration of mycobacteria in vitro, which uses reporter-gene tagged mycobacteria instead of colony-forming units (CFU). “Survival” of organisms as well as host response-markers are measured simultaneously, providing a low-cost, versatile and functional system for studies of host/pathogen interactions in the context of tuberculosis.

 JoVE Clinical and Translational Medicine

Accurate and Simple Measurement of the Pro-inflammatory Cytokine IL-1β using a Whole Blood Stimulation Assay


JoVE 2662 3/01/2011

1Translational Immunology Section, Office of Science and Technology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, 2Translational Autoinflammatory Disease Section, Office of the Clinical Director, National Institute of Arthritis and Musculoskeletal and Skin Diseases

We describe a simple immunoassay to measure the production of pro-inflammatory cytokines, such as IL-1 beta production, in patients presenting with autoinflammatory phenotypes. By activating cells in whole blood cultures with pathogen-associated molecular patterns, specifically with lipopolysaccharide, cytokine secretion can be conveniently evaluated in whole blood supernatants.

 JoVE Immunology and Infection

Ex Vivo Red Blood Cell Hemolysis Assay for the Evaluation of pH-responsive Endosomolytic Agents for Cytosolic Delivery of Biomacromolecular Drugs


JoVE 50166 3/09/2013

1Department of Biomedical Engineering, Vanderbilt University, 2Vanderbilt Institute for Nanoscale Science & Engineering, Vanderbilt University, 3Interdisciplinary Materials Science Program, Vanderbilt University, 4Monroe Carell Jr. Children's Hospital, Vanderbilt University Medical Center, 5Department of Chemical & Biomolecular Engineering, Vanderbilt University, 6Department of Cancer Biology, Vanderbilt University

A hemolysis assay can be used as a rapid, high-throughput screen of drug delivery systems' cytocompatibility and endosomolytic activity for intracellular cargo delivery. The assay measures the disruption of erythrocyte membranes as a function of environmental pH.

 JoVE Immunology and Infection

Protocol for Production of a Genetic Cross of the Rodent Malaria Parasites


JoVE 2365 1/03/2011

1National Institute of Allergy and Infectious Diseases, National Institutes of Health, 2School of Life Science, Xiamen University

Genetic crosses of rodent malaria parasites are performed by feeding two genetically distinct parasites to mosquitoes. Recombinant progeny are cloned from mouse blood after allowing mosquitoes to bite infected mice. This video shows how to produce genetic crosses of Plasmodium yoelii and is applicable to other rodent malaria parasites.

 JoVE General

Generation of Human Induced Pluripotent Stem Cells from Peripheral Blood Using the STEMCCA Lentiviral Vector


JoVE 4327 10/31/2012

1Center for Regenerative Medicine (CReM), Boston University School of Medicine, 2Department of Hematology, Children's Hospital of Philadelphia, 3Center for Cellular and Molecular Therapeutics, Children's Hospital of Philadelphia

Here we show a simple and effective protocol for the generation of human iPSCs from 3-4 ml of peripheral blood using a single lentiviral reprogramming vector. Reprogramming of readily available blood cells promises to accelerate the utilization of iPSC technology by making it accessible to a broader research community.

 JoVE Immunology and Infection

A Simple Protocol for Platelet-mediated Clumping of Plasmodium falciparum-infected Erythrocytes in a Resource Poor Setting


JoVE 4316 5/16/2013

1Malawi-Liverpool-Wellcome Trust Clinical Research Programme, 2Liverpool School of Tropical Medicine, 3Department of Microbiology, Division of Medical Parasitology, New York University School of Medicine

This method investigates the platelet-mediated clumping phenotype of Plasmodium falciparum-infected erythrocytes (pRBC) in clinical isolates. This is performed by isolating and co-incubating platelet-rich plasma and a suspension of pRBC.

 JoVE Clinical and Translational Medicine

Experimental Human Pneumococcal Carriage


JoVE 50115 2/15/2013

1Respiratory Infection Group, Liverpool School of Tropical Medicine, 2Royal Liverpool and Broadgreen, University Hospital Trust, 3Comprehensive Local Research Network, 4NIHR Biomedical Research Centre in Microbial Diseases, Royal Liverpool and Broadgreen University Hospitals NHS Trust, 5Institute of Lung Health, Respiratory Biomedical Unit, University Hospitals of Leicester NHS Trust & University of Leicester, 6Department of Clinical Infection Microbiology & Immunology, Institute of Infection & Global Health, University of Liverpool

Experimental human pneumococcal carriage offers a natural model of carriage and a potential model for use in vaccine development. This technique is valuable yet complex and involves clinical risk by introducing a pathogen into a human. We have developed a detailed protocol.

 JoVE Clinical and Translational Medicine

Patient Derived Cell Culture and Isolation of CD133+ Putative Cancer Stem Cells from Melanoma


JoVE 50200 3/13/2013

1Institute of Pathology, Laboratory of Molecular Tumor Pathology, Charité - Universitätsmedizin Berlin, 2Institute for Chemistry and Biochemistry, Free University Berlin, 3Laboratory for Functional Genomics Charité (LFGC), Charité - Universitätsmedizin Berlin, 4Comprehensive Cancer Center Charité, Charité - Universitätsmedizin Berlin

This article describes the preparation of freshly obtained melanoma tissue into primary cell cultures, and how to remove contaminations of erythrocytes and fibroblasts from the tumor cells. Finally, we describe how CD133+ putative melanoma stem cells are sorted from the CD133- bulk using Magnetic Activated Cell Sorting (MACS).

 JoVE General

Lentiviral-mediated Knockdown During Ex Vivo Erythropoiesis of Human Hematopoietic Stem Cells


JoVE 2813 7/16/2011

1The Sprott Center for Stem Cell Research, Regenerative Medicine Program, Ottawa Hospital Research Institute, 2Department of Cellular and Molecular Medicine, University of Ottawa

An ex vivo protocol to generate mature human red blood cells from hematopoietic stem/progenitors is described. Additionally we describe an efficient lentiviral-delivery method to knockdown the transcription factor TAL1 in primary erythroid cells. The efficiency of lentivirus mediated gene delivery is demonstrated using GFP expressing viruses.

 JoVE Immunology and Infection

An In vitro Co-infection Model to Study Plasmodium falciparum-HIV-1 Interactions in Human Primary Monocyte-derived Immune Cells


JoVE 4166 8/15/2012

Infectious Disease Research Center, CHUL (CHUQ), Quebec City, Quebec, Canada

We have developed an in vitro malaria-HIV-1 co-infection model to study the impact of Plasmodium falciparum on the HIV-1 replicative cycle in human primary monocyte-derived macrophages. This versatile system can easily be adapted to other primary cell types susceptible to HIV-1 infection.

 JoVE Clinical and Translational Medicine

Preparation and Pathogen Inactivation of Double Dose Buffy Coat Platelet Products using the INTERCEPT Blood System


JoVE 4414 12/07/2012

Department of Laboratory Medicine, Section for Transfusion Medicine, Örebro University Hospital

This article describes the process used by Örebro University Hospital to produce double dose buffy coat platelet concentrates prepared from whole blood donations and treated with the INTERCEPT Blood System for pathogen inactivation. The in vitro quality of the final platelet units are evaluated over 7 days of storage.

 JoVE Neuroscience

Growth and Differentiation of Adult Hippocampal Arctic Ground Squirrel Neural Stem Cells


JoVE 2199 1/07/2011

1Alaska Basic Neuroscience Program, Institute of Arctic Biology, University of Alaska at Fairbanks, 2Department Biochemistry, Hood College, 3Department of Cell Biology, Neuronascent, Inc., 4Research and Development, Neuronascent, Inc.

Neural stem cells were prepared from the hippocampus of adult non-hibernating yearling Arctic ground squirrels (AGS). These neural stem cells can be expanded through numerous passages, differentiated and maintained as a nearly 50:50 neuron to glial culture.

 JoVE General

Blood Collection from the American Horseshoe Crab, Limulus Polyphemus


JoVE 958 10/13/2008

1Department of Molecular and Cell Biology, University of California, Davis, 2Marine Biological Laboratory - MBL- woods hole, 3Department of Biological Sciences, Hunter College of CUNY

The American horseshoe crab, Limulus polyphemus, is arguably the most convenient source for large quantities of blood of any invertebrate. The blood is simple in composition, with only one cell-type in the general circulation, the granular amebocyte, and only three abundant proteins in the plasma, hemocyanin, the C-reactive proteins, and α2-macroglobulin. Blood is collected from the heart and the blood cells and plasma are separated by centrifugation.

 JoVE General

Isolation and Large Scale Expansion of Adult Human Endothelial Colony Forming Progenitor Cells


JoVE 1524 10/28/2009

Stem Cell Research Unit, Medical University of Graz, Austria

Endothelial colony forming progenitor cells (ECFCs) are a promising tool to study vascular homeostasis and repair.1,2 This paper introduces a novel animal-serum free method for isolation and expansion of ECFC from heparinised adult human peripheral blood with pooled human platelet lysate (pHPL) diminishing the risk of anti-bovine immunisation.

 JoVE Bioengineering

Endothelialized Microfluidics for Studying Microvascular Interactions in Hematologic Diseases


JoVE 3958 6/22/2012

1Department of Pediatrics, Emory University School of Medicine, 2Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 3Aflac Cancer Center and Blood Disorders Service of Children's Healthcare of Atlanta, 4Winship Cancer Institute of Emory University

A method to culture an endothelial cell monolayer throughout the entire inner 3D surface of a microfluidic device with microvascular-sized channels (<30 μm) is described. This in vitro microvasculature model enables the study of biophysical interactions between blood cells, endothelial cells, and soluble factors in hematologic diseases.

 JoVE Immunology and Infection

PRP as a New Approach to Prevent Infection: Preparation and In vitro Antimicrobial Properties of PRP


JoVE 50351 4/09/2013

1Department of Orthopaedics, School of Medicine, West Virginia University, 2Department of Orthopaedics, Stem Cell Research Center, University of Pittsburgh, 3WVNano Initiative, 4Mary Babb Randolph Cancer Center

Implant-associated infection is a significant clinical complication. This study describes an approach using platelet-rich plasma (PRP) to prevent implant-associated infections, presents the protocol for preparing PRP with constant platelet concentration, and reports the newly identified antimicrobial properties of PRP and related protocols for examining such antimicrobial properties in vitro.

 JoVE Immunology and Infection

Isolation of Human Umbilical Vein Endothelial Cells and Their Use in the Study of Neutrophil Transmigration Under Flow Conditions


JoVE 4032 8/08/2012

Department of Physiology and Pharmacology, University of Calgary

This article first describes a procedure for isolating human endothelial cells from umbilical veins and then shows how to use these cells to examine neutrophil transmigration under flow conditions. By using a low-volume flow chamber made from a polymer with the optical characteristics of glass, live-cell fluorescent imaging of rare cell populations is also possible.

 JoVE General

Generation of Bone Marrow Derived Murine Dendritic Cells for Use in 2-photon Imaging


JoVE 773 7/09/2008

1Department of Physiology and Biophysics, University of California, Irvine (UCI), 2Department of Neurobiology and Behaviour, University of California, Irvine (UCI)

Antigen presentation in secondary lymphoid organs by dendritic cells is crucial for the initiation of the T cell mediated adaptive immune response. Here we demonstrate the culture of bone marrow derived murine dendritic cells, activation, and labeling for 2-photon imaging.

 JoVE Immunology and Infection

Differentiating Functional Roles of Gene Expression from Immune and Non-immune Cells in Mouse Colitis by Bone Marrow Transplantation


JoVE 4208 10/01/2012

Center for Inflammatory Bowel Diseases, Division of Digestive Diseases, David Geffen School of Medicine, The University of California Los Angeles, Los Angeles

Bone marrow transplantation provides a way to change the genotype of the bone marrow derived cells. If the gene of interest is expressed in both bone marrow derived cells and non-bone marrow derived cells, bone marrow transplantation can change the bone marrow derived cells to a different genotype without changing the non-bone marrow derived cell genotype.

 JoVE General

Preparation of Pooled Human Platelet Lysate (pHPL) as an Efficient Supplement for Animal Serum-Free Human Stem Cell Cultures


JoVE 1523 10/30/2009

Stem Cell Research Unit, Medical University of Graz, Austria

Human platelet lysate is a rich source of growth factors and a potent supplement in cell culture. This protocol presents the process of preparing a large pool of human platelet lysate by starting from platelet rich plasma, performing several freeze-thaw cycles and depleting the platelet fragments.

 JoVE Immunology and Infection

Expanding Cytotoxic T Lymphocytes from Umbilical Cord Blood that Target Cytomegalovirus, Epstein-Barr Virus, and Adenovirus


JoVE 3627 5/07/2012

1Center for Cell and Gene Therapy, Baylor College of Medicine, 2Pathology and Immunology, Baylor College of Medicine, 3Department of Stem Cell Transplantation and Cellular Therapy, University of Texas M.D. Anderson Cancer Center, 4Medicine, Baylor College of Medicine, 5Department of Pediatrics, Baylor College of Medicine

Here we describe the first good manufacturing practice (GMP)-compliant method of producing virus-specific cytotoxic T lymphocytes (CTL) from umbilical cord blood, a source of predominantly naîve T cells.

 JoVE Immunology and Infection

Separation of Plasmodium falciparum Late Stage-infected Erythrocytes by Magnetic Means


JoVE 50342 3/02/2013

1Centro de Biología Celular y Molecular de Enfermedades, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), 2Acharya Nagarjuna University, 3Departamento de Medios y Creativo, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP)

The paramagnetic properties of hemozoin are used to isolate late stages of Plasmodium falciparum-infected red blood cells growing in culture. The method is simple and fast and does not affect the subsequent invasive capabilities of the parasites.

 JoVE General

Phenotypic and Functional Characterization of Endothelial Colony Forming Cells Derived from Human Umbilical Cord Blood


JoVE 3872 4/13/2012

Herman B Wells Center for Pediatric Research, Indiana University School of Medicine

Endothelial colony forming cells (ECFCs) are circulating endothelial cells with robust clonal proliferative potential that display intrinsic in vivo vessel forming ability. Phenotypic and functional characterization of outgrowth endothelial cells derived from CB are important to identify and isolate bona fide ECFCs for potential clinical application in repairing damaged tissues.

 JoVE Bioengineering

Ex vivo Mimicry of Normal and Abnormal Human Hematopoiesis


JoVE 3654 4/10/2012

1Department of Chemical Engineering and Chemical Technology, South Kensington campus, Imperial College London, 2Department of Hematology, Northwick Park & St. Mark's campus, Imperial College London

A 3D culture system for hematopoiesis is described using human cord blood and leukemic bone marrow cells. The method is based on the use of a porous synthetic polyurethane scaffold coated with extracellular matrix proteins. This scaffold is adaptable to accommodate a wide range of cells.

 JoVE General

Dissection of the Adult Zebrafish Kidney


JoVE 2839 8/29/2011

Department of Biological Sciences, University of Notre Dame

The zebrafish kidney is home to both renal and hematopoietic adult stem/progenitor cells, and represents an outstanding opportunity to study these cell types and their progeny in a vertebrate model organism. Here, we demonstrate a detailed dissection procedure that enables the researcher to identify and surgically remove the adult zebrafish kidney, which can be used for applications such as cell isolation, transplantation, and expression studies of kidney and/or blood cell populations.

 JoVE Neuroscience

Strategies for Study of Neuroprotection from Cold-preconditioning


JoVE 2192 9/02/2010

Department of Neurology, The University of Chicago Medical Center

We seek to define the neural immune signaling responsible for cold-preconditioning as means to identify novel targets for therapeutics development to protect brain before injury onset. We present strategies for such work that require biological systems, experimental manipulations plus technical capacities that are highly reproducible and sensitive.

 JoVE Neuroscience

Generation of an Immortalized Murine Brain Microvascular Endothelial Cell Line as an In Vitro Blood Brain Barrier Model


JoVE 4022 8/29/2012

Klinik und Poliklinik für Anästhesiologie, University of Wurzburg

This method describes how to isolate and immortalize microvascular endothelial cells from mouse brain. We describe a step-by-step protocol starting from the homogenization of brain tissue, digestion steps, seeding and immortalization of the cells. Usually, it takes about five weeks to obtain a homogenous, immortalized microvascular endothelial cell line.

 JoVE General

Isolation and Culture of Pulmonary Endothelial Cells from Neonatal Mice


JoVE 2316 12/14/2010

Blood Research Institute, BloodCenter of Wisconsin

Here, we describe a protocol for isolation and culture of murine pulmonary endothelial cells. This method comprises mechanic and enzymatic lung tissue dissociation as well as a 2-step purification process using anti-PECAM-1 and anti-ICAM-2 antibodies conjugated to magnetic beads, which produces a pure endothelial cell population of mostly microvascular origin.

 JoVE Immunology and Infection

Determining Optimal Cytotoxic Activity of Human Her2neu Specific CD8 T cells by Comparing the Cr51 Release Assay to the xCELLigence System


JoVE 3683 8/08/2012

Department of Immunology, College of Medicine, Mayo Clinic

The chromium release assay, a common assay for detecting cytotoxic T cell activity, has several limitations. Using antigen-specific CD8 T cells and the human breast cancer tumor line, SKBR3, in the present article, an impedance-based approach was examined for the capability of detecting cell killing.

 JoVE Clinical and Translational Medicine

Processing of Human Reduction Mammoplasty and Mastectomy Tissues for Cell Culture


JoVE 50011 1/03/2013

Life Science Division, Lawrence Berkeley National Laboratory

A method to process human mammary surgical discard material is described. Processed tissue, in the form of organoids, can be stored frozen indefinitely or placed in culture for long-term growth. This method enables experimental examination of normal human epithelial cell biology, and the effects of exogenous perturbations.

 JoVE General

In vivo Liver Endocytosis Followed by Purification of Liver Cells by Liver Perfusion


JoVE 3138 11/10/2011

Department of Biochemistry, University of Nebraska, Lincoln

The study of liver sinusoidal endothelial cells (SECs) must be performed with primary cells obtained from the animal as no cell lines exist. This method relies on liver digestion and differential centrifugation for SEC purification for subsequent culturing and experimentation.

 JoVE Clinical and Translational Medicine

Treatment of Osteochondral Defects in the Rabbit's Knee Joint by Implantation of Allogeneic Mesenchymal Stem Cells in Fibrin Clots


JoVE 4423 5/21/2013

1Department of Orthopaedic Sports Medicine, Klinikum rechts der Isar der Technischen Universität München, 2Department of Radiology, Klinikum rechts der Isar der Technischen Universität München, 3Institute of Experimental Oncology and Therapy Research, Klinikum rechts der Isar der Technischen Universität München, 4Department of Radiology, Uniklinik Köln

An experimental technique for the treatment of osteochondral defects in the rabbit's knee joint is described. The implantation of allogeneic mesenchymal stem cells into osteochondral defects provides a promising development in the field of tissue engineering. The preparation of fibrin-cell-clots in vitro offers a standardized method for implantation.

 JoVE Clinical and Translational Medicine

Using Quantitative Real-time PCR to Determine Donor Cell Engraftment in a Competitive Murine Bone Marrow Transplantation Model


JoVE 50193 3/07/2013

Division of Hematology-oncology, Department of Medicine, Medical University of South Carolina

Determining donor cell engraftment presents a challenge in mouse bone marrow transplant models that lack well-defined phenotypical markers. We described a methodology to quantify male donor cell engraftment in female transplant recipient mice. This method can be used in all mouse strains for the study of HSC functions.

 JoVE General

Protocol for Plasmodium falciparum Infections in Mosquitoes and Infection Phenotype Determination


JoVE 222 7/04/2007

Malaria Research Institute, Bloomberg School of Public Health, Johns Hopkins University

Once a gene is identified as potentially refractory for malaria, it must be evaluated for its role in preventing Plasmodium infections within the mosquito. This protocol illustrates how the extent of plasmodium infections of mosquitoes can be assayed. The techniques for preparing the gametocyte culture, membrane feeding mosquitoes human blood, and assaying viral titers in the mosquito midgut are demonstrated.

 JoVE Immunology and Infection

Induction of Alloantigen-specific Anergy in Human Peripheral Blood Mononuclear Cells by Alloantigen Stimulation with Co-stimulatory Signal Blockade


JoVE 2673 3/14/2011

1Medical Oncology, Dana Farber Cancer Institute, 2Department of Medicine, Brigham and Womens Hospital, 3Pediatric Oncology, Dana Farber Cancer Institute, 4Division of Hematology/Oncology, Children’s Hospital Boston

This paper describes a simple technique to induce alloantigen-specific anergy in human peripheral blood mononuclear cells. The technique can be applied clinically to generate non-alloreactive donor cells. Infusion of these cells could improve immune reconstitution and reduce toxicity after allogeneic hematopoietic stem cell transplantation.

 JoVE General

Bioengineering Human Microvascular Networks in Immunodeficient Mice


JoVE 3065 7/11/2011

Department of Cardiac Surgery, Children's Hospital Boston, Harvard Medical School

Here, we describe a methodology to deliver human cord blood-derived endothelial colony-forming cells (ECFCs) and bone marrow-derived mesenchymal stem cells (MSCs), embedded in a collagen/fibronectin gel, subcutaneously into immunodeficient mice. This cell/gel combination generates a human vascular network that connects with the mouse vasculature.

 JoVE Immunology and Infection

Selection of Plasmodium falciparum Parasites for Cytoadhesion to Human Brain Endothelial Cells


JoVE 3122 1/03/2012

Centre for Immunity, Infection and Evolution, University of Edinburgh

An in vitro model for cerebral malaria sequestration is described1. Plasmodium falciparum infected red blood cells are selected for binding to immortalized human brain microvascular endothelial cells. The selected parasites show a distinct phenotype. The selection process can be applied using various P. falciparum strains and endothelial cell lines.

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