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    Breaking News

    Early Stimulation Improves Performance of Bioengineered Human Heart Cells

    This muscle could serve as a better model for testing the effects of drugs and toxic substances.

    Early Stimulation Improves Performance of Bioengineered Human Heart Cells
    The iPS-derived cardiomyocytes have formed heart tissue that closely mimics human heart functionality at over four weeks of maturation. Image courtesy of Columbia University.
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    National Institutes of Health04.05.18
    Researchers are now able to use induced pluripotent stem cells (iPSC) to form a model of human adult-like cardiac muscle by introducing electric and mechanical stimulation at an early stage. Since this muscle is similar to the adult heart, it could serve as a better model for testing the effects of drugs and toxic substances than current tissue-engineered heart models. The study, performed by scientists at Columbia University, New York City, and funded by the National Institutes of Health, was published in Nature.
     
    Stem cells have the potential to turn into many different types of cells. Human cells lose this flexibility once they have matured, which is why, for example, heart cells don’t spontaneously decide to become lung cells. iPSCs are cells taken from an adult that have been manipulated, or induced, into a stem-cell state. Researchers are then able to guide these “blank slate” cells into different cell types by using various chemical and physical stimuli. Scientists have been able to engineer cardiac tissue using iPS-derived cardiomyocytes (iPS-CMs) for years. However, engineering tissue that can successfully mimic the intricacies of adult human heart cells is not easy and, until now, had not been achieved in the lab.
     
    “Human cardiac tissues grown in the lab that displays the behavior of native heart muscle would be transformative for biomedical research,” said Gordana Vunjak-Novaković, Ph.D., biomedical engineering professor at Columbia University. “To reach this goal, we forced the cultured heart muscle to go through the fetal-to-postnatal transition by an accelerated development. This was done by using early-stage iPS-CMs and increasing the frequency of electrically induced contractions, little by little, every day. The tissues responded, and displayed adult-like gene expression, remarkably organized ultrastructure, and a number of functional features seen in the mature heart muscle, after only four weeks of culture.”
     
    Vunjak-Novaković and her team have made significant strides in reliably engineering human heart muscle that mimics adult myocardium. They found that the longer they waited to introduce physical stimuli such as electric current and mechanical stimulation to the iPSCs, the less responsive the cells were. The team reasoned that the earlier they introduced electromechanical stimuli, the greater the effect would be.
     
    They tested two types of iPS-CMs: early stage (12-day old cells) and late stage (28-day old mature cells) under three different scenarios. The first test condition was a control in which there was no stimulation whatsoever. The second was three weeks of constant electrical stimulation. The third was two weeks of progressively increasing levels of electrical stimulation followed by a week of constant intensity stimulation. This third scenario mimicked the changes the human heart undergoes during the last few weeks of fetal development and after birth.
     
    The researchers found that the third scenario, introducing physical conditioning at an increasing intensity to early stage iPS-CMs, helped them form adult-like human cardiac tissue after just four weeks of culture in the lab.
     
    “The resulting engineered tissue is truly unprecedented in its similarity to functioning human tissue,” said Seila Selimovic, Ph.D., director of the National Institute of Biomedical Imaging and Bioengineering (NIBIB) Tissue Chips program. “The ability to develop mature cardiac tissue in such a short time is an important step in moving us closer to having reliable human tissue models for drug testing.” The better the engineered tissues emulate the human heart, the better they can predict the effects that drugs or environmental factors have on the actual heart tissue of a patient. Having a reliable human tissue model would help make drug development significantly faster, safer and cheaper.
     
    The study was funded by the National Institute of Biomedical Imaging and Bioengineering, the National Center for Advancing Translational Sciences, the National Institute of Arthritis and Musculoskeletal and Skin Diseases, the National Institute of Dental and Craniofacial Research, the National Institute of Environmental Health Sciences, and the National Heart, Lung, and Blood Institute through grants EB017103, EB025765, HL076485, and HL138486.
     
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