A new method of growing cardiac tissue is teaching old stem cells new tricks. The discovery, which transforms aged stem cells into cells that function like much younger ones, may one day enable scientists to grow cardiac patches for damaged or diseased hearts from a patient's own stem cells—no matter what age the patient—while avoiding the threat of rejection.
Stem cell therapies involving donated bone marrow stem cells run the risk of patient rejection in a portion of the population, argues Milica Radisic, Canada Research Chair in Functional Cardiovascular Tissue Engineering at the Institute of Biomaterials and Biomedical Engineering (IBBME) and Associate Professor in the Department of Chemical Engineering and Applied Chemistry at the University of Toronto.
One method of avoiding the risk of rejection has been to use cells derived from a patient's own body. But until now, clinical trials of this kind of therapy using elderly patients' own cells have not been a viable option, since aged cells tend not to function as well as cells from young patients.
"If you want to treat these people with their own cells, how do you do this?"
It's a problem that Radisic and her co-researcher, Dr. Ren-Ke Li, think they might have an answer for: by creating the conditions for a 'fountain of youth' reaction within a tissue culture.
Li holds the Canada Research Chair in Cardiac Regeneration and is a Professor in the Division of Cardiovascular Surgery, cross-appointed to IBBME. He is also a Senior Scientist at the Toronto General Research Institute.
Radisic and Li first create a "micro-environment" that allows heart tissue to grow, with stem cells donated from elderly patients at the Toronto General Hospital.
The cell cultures are then infused with a combination of growth factors—common factors that cause blood vessel growth and cell proliferation—positioned in such a way within the porous scaffolding that the cells are able to be stimulated by these factors.
Dr. Li and his team then tracked the molecular changes in the tissue patch cells. "We saw certain aging factors turned off," states Li, citing the levels of two molecules in particular, p16 and RGN, which effectively turned back the clock in the cells, returning them to robust and healthy states.
"It's very exciting research," says Radisic, who was named one of the top innovators under 35 by MIT in 2008 and winner of the 2012 Young Engineers Canada award.
Li and Radisic hope to continue their goal to create the most effective environment in which cells from older patients can be given new life. "We can create much better tissues which can then be used to repair defects such as aneurysms," Li says, as well as repairing damage caused by heart attacks.
The study was recently released in the Journal of the American College of Cardiology, the top journal in the field of cardiovascular medicine.
The Institute of Biomaterials and Biomedical Engineering (IBBME) is an interdisciplinary unit situated between three Faculties at the University of Toronto: Applied Science and Engineering, Dentistry and Medicine. The Institute pursues research in four areas: neural, sensory systems and rehabilitation engineering; biomaterials, tissue engineering and regenerative medicine; molecular imaging and biomedical nanotechnology; medical devices and clinical technologies.
Erin Vollick | EurekAlert!
Perseus translates proteomics data
27.07.2016 | Max-Planck-Institut für Biochemie
Severity of enzyme deficiency central to favism
26.07.2016 | Universität Zürich
Transparent electronics devices are present in today’s thin film displays, solar cells, and touchscreens. The future will bring flexible versions of such devices. Their production requires printable materials that are transparent and remain highly conductive even when deformed. Researchers at INM – Leibniz Institute for New Materials have combined a new self-assembling nano ink with an imprint process to create flexible conductive grids with a resolution below one micrometer.
To print the grids, an ink of gold nanowires is applied to a substrate. A structured stamp is pressed on the substrate and forces the ink into a pattern. “The...
A new Fraunhofer MEVIS method conveys medical interrelationships quickly and intuitively with innovative visualization technology
On the monitor, a brain spins slowly and can be examined from every angle. Suddenly, some sections start glowing, first on the side and then the entire back of...
Researchers at the U.S. Department of Energy's (DOE) Ames Laboratory have discovered an unusual property of purple bronze that may point to new ways to achieve high temperature superconductivity.
While studying purple bronze, a molybdenum oxide, researchers discovered an unconventional charge density wave on its surface.
Munich Physicists have developed a novel electron microscope that can visualize electromagnetic fields oscillating at frequencies of billions of cycles per second.
Temporally varying electromagnetic fields are the driving force behind the whole of electronics. Their polarities can change at mind-bogglingly fast rates, and...
Breakup of continents with two speed: Continents initially stretch very slowly along the future splitting zone, but then move apart very quickly before the onset of rupture. The final speed can be up to 20 times faster than in the first, slow extension phase.phases
Present-day continents were shaped hundreds of millions of years ago as the supercontinent Pangaea broke apart. Derived from Pangaea’s main fragments Gondwana...
15.07.2016 | Event News
15.07.2016 | Event News
11.07.2016 | Event News
27.07.2016 | Earth Sciences
27.07.2016 | Materials Sciences
27.07.2016 | Earth Sciences