Before the cardiologist goes nuclear w/ stress #AHA17

Measuring troponin in CAD patients before embarking on stress testing may provide Read more

Virus hunting season open

Previously unknown viruses, identified by Winship + UCSF scientists, come from a patient with a melanoma that had metastasized to the Read more

#AHA17 highlight: cardiac pacemaker cells

Highlighting new research on engineering induced pacemaker cells from Hee Cheol Cho's Read more

cardiac muscle cells

Blood vessels and cardiac muscle cells off the shelf

Tube-forming ability of purified CD31+ endothelial cells derived from induced pluripotent stem cells after VEGF treatment.

Chunhui Xu’s lab in the Department of Pediatrics recently published a paper in Stem Cell Reports on the differentiation of endothelial cells, which line and maintain blood vessels. Her lab is part of the Emory-Children’s-Georgia Tech Pediatric Research Alliance. The first author was postdoc Rajneesh Jha.

This line of investigation could eventually lead to artificial blood vessels, grown with patients’ own cells or “off the shelf,” or biological/pharmaceutical treatments that promote the regeneration of damaged blood vessels. These treatments could be applied to peripheral artery disease and/or coronary artery disease.

Xu’s paper concerns the protein LGR5, part of the Wnt signaling pathway. The authors report that inhibiting LGR5 steers differentiating pluripotent stem cells toward endothelial cells and away from cardiac muscle cells. The source iPSCs were a widely used IMR90 line.

Young-sup Yoon’s lab at Emory has also been developing methods for the generation of endothelial cells via “direct reprogramming.”

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Posted on by Quinn Eastman in Heart Leave a comment

Microgravity means more cardiac muscle cells

Cardiac muscle cells derived from stem cells could eventually be used to treat heart diseases in children or adults, reshaping hearts with congenital defects or repairing damaged tissue.

srep30956-f2

Cardiomyocytes produced with the help of simulated microgravity. Red represents the cardiac muscle marker troponin, and green is cadherin, which helps cells stick to each other. Blue = cell nuclei. From Jha et al SciRep (2016).

Using the right growth factors and conditions, it is possible to direct pluripotent stem cells into becoming cardiac muscle cells, which form spheres that beat spontaneously. Researchers led by Chunhui Xu, PhD, director of the Cardiomyocyte Stem Cell Laboratory in Emory’s Department of Pediatrics, are figuring out how to grow lots of these muscle cells and keep them healthy and adaptable.

As part of this effort, Xu and her team discovered that growing stem cells under “simulated microgravity” for a few days stimulates the production of cardiac muscle cells, several times more effectively than regular conditions. The results were published on Friday, Aug. 5 in Scientific Reports. The first author of the paper is postdoctoral fellow Rajneesh Jha, PhD. Read more

Posted on by Quinn Eastman in Heart Leave a comment