Human heart tissue grown from stem cells improves drug testing – Medical Xpress
By JoanneRUSSELL25
June 8, 2017 This image shows human heart muscle cells growing in the 3D tissue structure. The cells have been stained with fluorescent molecules to identify the nuclei in blue, and cardiac-specific protein, in green. Credit: Agency for Science, Technology and Research (A*STAR), Singapore
Researchers at the Institute of Bioengineering and Nanotechnology (IBN) of A*STAR have engineered a three-dimensional heart tissue from human stem cells to test the safety and efficacy of new drugs on the heart.
"Cardiotoxicity, which can lead to heart failure and even death, is a major cause of drug withdrawal from the market. Antibiotics, anticancer and antidiabetic medications can have unanticipated side effects for the heart. So it is important to test as early as possible whether a newly developed drug is safe for human use. However, cardiotoxicity is difficult to predict in the early stages of drug development," said Professor Jackie Y. Ying, Executive Director at IBN.
A big part of the problem is the use of animals or animal-derived cells in preclinical cardiotoxicity studies due to the limited availability of human heart muscle cells. Substantial genetic and cardiac differences exist between animals and humans. There have been a large number of cases whereby the tests failed to detect cardiovascular toxicity when moving from animal studies to human clinical trials.
Existing screening methods based on 2-D cardiac structure cannot accurately predict drug toxicity, while the currently available 3-D structures for screening are difficult to fabricate in the quantities needed for commercial application.
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To solve this problem, the IBN research team fabricated their 3-D heart tissue from cellular self-assembly of heart muscle cells grown from human induced pluripotent stem cells. They also developed a fluorescence labelling technology to monitor changes in beating rate using a real-time video recording system. The new heart tissue exhibited more cardiac-specific genes, stronger contraction and higher beating rate compared to cells in a 2-D structure.
"Using the 3-D heart tissue, we were able to correctly predict cardiotoxic effects based on changes in the beating rate, even when these were not detected by conventional tests. The method is simple and suitable for large-scale assessment of drug side effects. It could also be used to design personalized therapy using a patient's own cells," said lead researcher Dr Andrew Wan, who is Team Leader and Principal Research Scientist at IBN.
The researchers have filed a patent on their human heart tissue model, and hope to work with clinicians and pharmaceutical companies to bring this technology to market.
This finding was reported recently in the Biofabrication journal.
Explore further: Stem cell-based screening methods may predict heart-related side effects of drugs
More information: Hong Fang Lu et al. Engineering a functional three-dimensional human cardiac tissue model for drug toxicity screening, Biofabrication (2017). DOI: 10.1088/1758-5090/aa6c3a
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Human heart tissue grown from stem cells improves drug testing - Medical Xpress
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