June 6, 2013 Liver transplantation is the mainstay of treatment for patients with end-stage liver disease, the 12th leading cause of death in the United States, but new research from the Icahn School of Medicine at Mount Sinai, published in the journal Cell Stem Cell today, suggests that it may one day become possible to regenerate a liver using cell therapy in patients with liver disease. Investigators discovered that a human embryonic stem cell can be differentiated into a previously unknown liver progenitor cell, an early offspring of a stem cell, and produce mature and functional liver cells.
"The discovery of the novel progenitor represents a fundamental advance in this field and potentially to the liver regeneration field using cell therapy," said the study's senior author, Valerie Gouon-Evans, PharmD, PhD, Assistant Professor, in the Department of Developmental and Regenerative Biology, Black Family Stem Cell Institute, at the Icahn School of Medicine at Mount Sinai. "Until now, liver transplantation has been the most successful treatment for people with liver failure, but we have a drastic shortage of organs. This discovery may help circumvent that problem."
In conjunction with the laboratory of Matthew J. Evans, PhD, from the Department of Microbiology at Icahn School of Medicine at Mount Sinai, investigators demonstrated the functionality of the liver cells generated from the progenitors, as the liver cells can be infected by the hepatitis C virus, a property restricted to liver cells exclusively.
A critical discovery in this research was finding that the novel progenitor has a receptor protein on its cell surface called KDR, or vascular endothelial growth factor receptor 2, which until now, was thought to be restricted to endothelial cells that form vessels, the progenitors for endothelial cells and the progenitors blood cells. The research team showed that activation of KDR on these novel liver progenitors differentiates them into mature liver cells. Additionally, work in a mouse model revealed similar cells, indicating that the progenitors are conserved from mouse to human, and therefore, they must be "important cells with promising potential for cell therapy in treating liver disease," explained Dr. Gouon-Evans.
Next, the research team will examine specifically whether these liver cells obtained from human embryonic stem cells in a dish help repair injured livers in preclinical animal models of liver disease.
Funding for this study was provided by The Black Family Stem Cell Institute, the National Institute of Diabetes and Digestive and Kidney Diseases, the Robin Chemers Neustein Postdoctoral Fellowship, the American Cancer Society, and Pew Charitable Funds.
About The Black Family Stem Cell Institute The Black Family Stem Cell Institute is Mount Sinai's foundation for both basic and disease-oriented research on embryonic and adult stem cells. The therapeutic use of stem cells is a promising area of medicine for the decades ahead and researchers are examining why stem cells function in certain types of niches, microenvironments, and pockets of activity. Investigators are working to break the code in stem cell communication by determining how stem cells signal one another and other cells. The new knowledge that will result from this research holds the promise of diagnostic and therapeutic breakthroughs.
Studies show that it is possible to reprogram adult skin cells into cells that are very similar to embryonic stem cells. Once stem cells can be grown and differentiated in a controlled way to replace degenerated cells and repair tissues, medical science may then be able to diagnose and cure many intractable diseases at their earliest stages, such as type 1 diabetes, Parkinson's disease, various cardiovascular diseases, liver disease, and cancer.
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New liver cell for cellular therapy to aid in liver regeneration
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