Researchers from North Carolina State University, the University of North Carolina at Chapel Hill and First Affiliated Hospital of Zhengzhou University have developed a synthetic version of a cardiac stem cell. These synthetic stem cells offer therapeutic benefits comparable to those from natural stem cells and could reduce some of the risks associated with stem cell therapies. Additionally, these cells have better preservation stability and the technology is generalizable to other types of stem cells.
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| Synthetic cardiac stem cells could offer therapeutic benefits without associated risks. Credit: Alice Harvey, NC State University. |
Stem cell therapies work by promoting endogenous repair; that is, they aid damaged tissue in repairing itself by secreting “paracrine factors,” including proteins and genetic materials. While stem cell therapies can be effective, they are also associated with some risks of both tumor growth and immune rejection. Also, the cells themselves are very fragile, requiring careful storage and a multi-step process of typing and characterization before they can be used.
Ke Cheng, associate professor of molecular biomedical sciences at NC State University, associate professor in the joint biomedical engineering program at NC State and UNC and adjunct associate professor at the UNC Eshelman School of Pharmacy, led a team in developing the synthetic version of a cardiac stem cell that could be used in off-the-shelf applications. Cheng and his colleagues fabricated a cell-mimicking microparticle (CMMP) from poly (lactic-co-glycolic acid) or PLGA, a biodegradable and biocompatible polymer. The researchers then harvested growth factor proteins from cultured human cardiac stem cells and added them to the PLGA. Finally, they coated the particle with cardiac stem cell membrane.
When tested in vitro, both the cell-mimicking microparticle and cardiac stem cell promoted the growth of cardiac muscle cells. They also tested the cell-mimicking microparticle in a mouse model with myocardial infarction, and found that its ability to bind to cardiac tissue and promote growth after a heart attack was comparable to that of cardiac stem cells. Due to its structure, cell-mimicking microparticle cannot replicate – reducing the risk of tumor formation.
“The synthetic cells operate much the same way a deactivated vaccine works,” Cheng says. “Their membranes allow them to bypass the immune response, bind to cardiac tissue, release the growth factors and generate repair, but they cannot amplify by themselves. So you get the benefits of stem cell therapy without risks.”
The synthetic stem cells are much more durable than human stem cells, and can tolerate harsh freezing and thawing. They also don’t have to be derived from the patient’s own cells. And the manufacturing process can be used with any type of stem cell.
“We are hoping that this may be a first step toward a truly off-the-shelf stem cell product that would enable people to receive beneficial stem cell therapies when they’re needed, without costly delays,” Cheng says.
Citation: Junnan Tang, Deliang Shen, Thomas George Caranasos, Zegen Wang, Tyler A. Allen, Adam Vandergriff, Michael Taylor Hensley, Phuong-Uyen Dinh, Jhon Cores, Taosheng Li, Jinying Zhang, Quancheng Kan, Ke Cheng. “Therapeutic microparticles functionalized with biomimetic cardiac stem cell membranes and secretome”. Nature Communications 2016.
DOI: 10.1038/NCOMMS13724
Research funding: National Institutes of Health, NC State Chancellor’s Innovation Fund, University of North Carolina General Assembly Research Opportunities Initiative.
Adapted from press release by North Carolina State University