Cell therapy for the treatment of liver disease is a promising alternative to organ transplantation. The feasibility of cell transplantation to correct enzyme deficiency and provide a bridge to liver transplantation has been demonstrated in human trials, but this approach is limited by a severe shortage of liver donors and hepatocytes. Therefore, a long-term aim in the field is to identify alternative sources of hepatocytes that coul potentially be useful for cell therapy. One potential source is the intrahepatic progenitor/stem cells that normally differentiate into both bile ducts and hepatocytes throughout adult life. Recently it became possible to prospectively isolate liver progenitor cells from adult mice and humans, to establish self-renewing cultures with these cells in vitro, and to perform genetic lineage tracing in vivo. In this application, we propose to utilize new methodology to isolate human liver progenitor cells and expand them in culture, and to test the ability of these human cells to repopulate the liver in a cell-transplantation model (Aim 1). Second, we propose to understand the requirement for these cells in a model of progressive liver injury (Aim 2). This research is relevant to understanding the mechanisms of liver repair in chronic injury and how these stem cells might be used for transplantation to treat liver diseases.

Public Health Relevance

Intrahepatic stem cells play an important role in the ability of the liver to regenerate during disease and damage, especially chronic injury. Until recently, the precise identity and location of this cell remained unknown, but now others and we have found methods to isolate these cells from both mice and humans. The relevance of the proposed studies is that they will open up the possibility of manipulating their behavior in chronic liver disease and using them for transplantation.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Individual Predoctoral NRSA for M.D./Ph.D. Fellowships (ADAMHA) (F30)
Project #
5F30DK095514-03
Application #
8703098
Study Section
Special Emphasis Panel (ZDK1-GRB-2 (J1))
Program Officer
Podskalny, Judith M,
Project Start
2012-04-01
Project End
2017-03-31
Budget Start
2014-04-01
Budget End
2015-03-31
Support Year
3
Fiscal Year
2014
Total Cost
$47,676
Indirect Cost
Name
Oregon Health and Science University
Department
Pediatrics
Type
Schools of Medicine
DUNS #
096997515
City
Portland
State
OR
Country
United States
Zip Code
97239
Tarlow, Branden D; Pelz, Carl; Naugler, Willscott E et al. (2014) Bipotential adult liver progenitors are derived from chronically injured mature hepatocytes. Cell Stem Cell 15:605-18
Tarlow, Branden D; Finegold, Milton J; Grompe, Markus (2014) Clonal tracing of Sox9+ liver progenitors in mouse oval cell injury. Hepatology 60:278-89