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 JoVE General

Respirometric Oxidative Phosphorylation Assessment in Saponin-permeabilized Cardiac Fibers

1Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Calgary, 2Faculty of Kinesiology, University of Calgary


JoVE 2431

Saponin-permeabilized fiber preparation in conjunction with respirometric oxidative phosphorylation analysis provides integrative assessment of mitochondrial function. Mitochondrial respiration in physiological and pathological states can reflect various regulatory influences including mitochondrial interactions, morphology and biochemistry.

 JoVE General

Assessment of Calcium Sparks in Intact Skeletal Muscle Fibers

1Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, 2Department of Physiology and Cell Biology, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, 3Department of Molecular Biophysics and Physiology, Rush University Medical Center, 4Department of Internal Medicine, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center


JoVE 50898

Described here is a method to directly measure calcium sparks, the elementary units of Ca2+ release from sarcoplasmic reticulum in intact skeletal muscle fibers. This method utilizes osmotic-stress-mediated triggering of Ca2+ release from ryanodine receptor in isolated muscle fibers. The dynamics and homeostatic capacity of intracellular Ca2+ signaling can be employed to assess muscle function in health and disease.

 JoVE Bioengineering

Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations

1Institute for Computational Medicine and the Department of Biomedical Engineering, Johns Hopkins University


JoVE 50125

A methodology to estimate ventricular fiber orientations from in vivo images of patient heart geometries for personalized modeling is described. Validation of the methodology performed using normal and failing canine hearts demonstrate that that there are no significant differences between estimated and acquired fiber orientations at a clinically observable level.

 JoVE General

Isolation and Culture of Neonatal Mouse Cardiomyocytes

1Randall and Cardiovascular Divisions, King’s College London, 2Division of Cardiology, School of Medicine, University of California San Diego


JoVE 50154

Primary mouse cardiomyocyte cultures are one of the pivotal tools for the investigation of myofibrillar organization and function. The following protocol describes the isolation and culture of primary cardiomyocytes from neonatal mouse hearts. The resulting cardiomyocyte cultures may be subsequently used for a variety of biomechanical, biochemical and cell-biological assays.

 JoVE Clinical and Translational Medicine

Intramyocardial Cell Delivery: Observations in Murine Hearts

1Magdi Yacoub Institute, Imperial College London, 2National Heart and Lung Institute, Imperial College London, 3Australian Regenerative Medicine Institute, Monash University


JoVE 51064

Intramyocardial cell delivery in murine models of cardiovascular diseases, such as hypertension or myocardial infarction, is widely used to test the therapeutic potential of different cell types in regenerative studies. Therefore, a detailed description and a clear visualization of this surgical procedure will help to define the limits and advantages of cardiovascular cell therapeutic analyses in small rodents.

 JoVE Bioengineering

Generation of Aligned Functional Myocardial Tissue Through Microcontact Printing

1Cardiovascular Research Center, Massachusetts General Hospital and Harvard Medical School, 2Harvard Stem Cell Institute


JoVE 50288

The generation of aligned myocardial tissue is a key requirement for adapting the recent advances in stem cell biology to clinically useful purposes. Herein we describe a microcontact printing approach for the precise control of cell shape and function. Using highly purified populations of embryonic stem cell derived cardiac progenitors, we then generate anisotropic functional myocardial tissue.

 JoVE General

Fluorescent Labeling of Drosophila Heart Structures

1Biology Department, San Diego State University, 2Development and Aging Program, NASCR Center, The Sanford Burnham Institute for Medical Research


JoVE 1423

Here we describe a basic protocol for fluorescent labeling of different elements of heart tubes from larva and adult Drosophila melanogaster. These specimens are well-suited for imaging via fluorescent or confocal microscopy. This technique permits detailed structural analysis of the features of the hearts from a powerful model organism.

 JoVE Immunology and Infection

Measurement of Antibody Effects on Cellular Function of Isolated Cardiomyocytes

1Department of Internal Medicine B, University Medicine Greifswald


JoVE 4237

The presented method offers a way to detect functional effective cardiotropic autoantibodies in the plasma of patients with dilated cardiomyopathy, irrespective of the specific antigen, by analysing the impact of isolated patient immunoglobulin on cellular shortening and intracellular calcium transients in isolated rat cardiomyocytes.

 JoVE Clinical and Translational Medicine

A Novel Application of Musculoskeletal Ultrasound Imaging

1Department of Electrical and Computer Engineering, George Mason University, 2Sports Medicine Assessment, Research & Testing Laboratory, George Mason University, 3School of Physics, Astronomy, and Computational Sciences, George Mason University, 4Department of Bioengineering, George Mason University


JoVE 50595

We describe a new ultrasound-based vector tissue Doppler imaging technique to measure muscle contraction velocity, strain and strain rate with sub-millisecond temporal resolution during dynamic activities. This approach provides complementary measurements of dynamic muscle function and could lead to a better understanding of mechanisms underlying musculoskeletal disorders.

 JoVE Bioengineering

Observing and Quantifying Fibroblast-mediated Fibrin Gel Compaction

1Department of Biomedical Engineering, University of Iowa


JoVE 50918

Time-lapse microscopy and image processing techniques were used to observe and analyze fibroblast-mediated gel compaction and fibrin fiber realignment in an environmentally controlled bioreactor over a 48 hr period.

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