OHSU Doernbecher scientists first to grow liver stem cells in culture, transplant them with demonstrated therapeutic benefit
02/25/13 Portland, Ore.
New mouse research in Nature raises hope that human liver stem cells can be similarly grown, transplanted
For decades scientists around the world have attempted to regenerate primary liver cells known as hepatocytes because of their numerous biomedical applications, including hepatitis research, drug metabolism and toxicity studies, as well as transplantation for cirrhosis and other chronic liver conditions. But no lab in the world has been successful in identifying and growing liver stem cells in culture -- using any available technique – until now.
In the journal Nature, physician-scientists in the Papé Family Pediatric Research Institute at Oregon Health & Science University Doernbecher Children’s Hospital, Portland, Ore., along with investigators at the Hubrecht Institute for Developmental Biology and Stem Cell Research, Utrecht, Netherlands, describe a new method through which they were able to infinitely expand liver stem cells from a mouse in a dish.
“This study raises the hope that the human equivalent of these mouse liver stem cells can be grown in a similar way and efficiently converted into functional liver cells,” said Markus Grompe, M.D., study co-author, director of the Papé Family Pediatric Research Institute at OHSU Doernbecher Children’s Hospital; and professor of pediatrics, and molecular and medical genetics in the OHSU School of Medicine.
In a previous Nature study, investigators at the Hubrecht Institute, led by Hans Clever, M.D, Ph.D., were the first to identify stem cells in the small intestine and colon by observing the expression of the adult stem cell marker Lgr5 and growth in response to a growth factor called Wnt. They also hypothesized that the unique expression pattern of Lgr5 could mark stem cells in other adult tissues, including the liver, an organ for which stem cell identification remained elusive.
In the current Nature study, Grompe and colleagues in the Papé Family Pediatric Research Institute at OHSU Doernbecher used a modified version of the Clever method and discovered that Wnt-induced Lgr5 expression not only marks stem cell production in the liver, but it also defines a class of stem cells that become active when the liver is damaged.
The scientists were able to grow these liver stem cells exponentially in a dish – an accomplishment never before achieved – and then transplant them in a specially designed mouse model of liver disease, where they continued to grow and show a modest therapeutic effect.
“We were able to massively expand the liver cells and subsequently convert them to hepatocytes at a modest percentage. Going forward, we will enlist other growth factors and conditions to improve that percentage. Liver stem cell therapy for chronic liver disease in humans is coming,” said Grompe.
The study, “In vitro expansion of single Lgr5+ liver stem cells induced by Wnt-driven regeneration,” was funded by National Institutes of Health Grant R01DK051592
Investigators who contributed to this research include: Grompe, Craig Dorrell, Annelise Haft, Papé Family Pediatric Research Institute, OHSU Doernbecher Children’s Hospital; Clever, Meritxell Huch, Sylvia Boj, Johan van Es, Vivian Li, Mare van de Wetering, Toshiro Sato, Karien Hamer, Nobuo Sasaki, Robert Vries, Hubrecht Institute for Developmental Biology and Stem Cell Research; and Milton Finegold, Texas Children’s Hospital Houston.
About OHSU Doernbecher Children's Hospital
OHSU Doernbecher Children's Hospital ranks among the top 50 children's hospitals in the United States.* OHSU Doernbecher cares for tens of thousands of children each year from Oregon, Southwest Washington and around the nation, resulting in more than 175,000 discharges, surgeries, transports and outpatient visits annually.
Nationally recognized OHSU Doernbecher physicians and nurses provide a full range of pediatric care in the most patient- and family-centered environment, and travel throughout Oregon and southwest Washington, providing specialty care to more than 3,000 children at more than 150 outreach clinics in 15 locations. In addition, OHSU Doernbecher delivers neonatal and pediatric critical care consultation to community hospitals statewide through its state-of-the-art telemedicine network.
* U.S. News & World Report 2012-13 Best Children's Hospitals
Oregon Health & Science University is the state’s only academic health and research university. As Portland's largest employer with nearly 14,000 employees, OHSU's size contributes to its ability to provide many services and community support not found anywhere else in the state. OHSU serves patients from every corner of Oregon and is a conduit for learning for more than 4,300 students and trainees. OHSU is the source of more than 200 community outreach programs that bring health and education services to each county in the state.