Extensive conversion of hepatic biliary epithelial cells to hepatocytes after near total loss of hepatocytes in zebrafish.

Abstract:

BACKGROUND & AIMS:Biliary epithelial cells (BECs) are considered to be a source of regenerating hepatocytes when hepatocyte proliferation is compromised. However, there is still controversy about the extent to which BECs can contribute to the regenerating hepatocyte population, and thereby to liver recovery. To investigate this issue, we established a zebrafish model of liver regeneration in which the extent of hepatocyte ablation can be controlled. METHODS:Hepatocytes were depleted by administration of metronidazole to Tg(fabp10a:CFP-NTR) animals. We traced the origin of regenerating hepatocytes using short-term lineage-tracing experiments, as well as the inducible Cre/loxP system; specifically, we utilized both a BEC tracer line Tg(Tp1:CreER(T2)) and a hepatocyte tracer line Tg(fabp10a:CreER(T2)). We also examined BEC and hepatocyte proliferation and liver marker gene expression during liver regeneration. RESULTS:BECs gave rise to most of the regenerating hepatocytes in larval and adult zebrafish after severe hepatocyte depletion. After hepatocyte loss, BECs proliferated as they dedifferentiated into hepatoblast-like cells; they subsequently differentiated into highly proliferative hepatocytes that restored the liver mass. This process was impaired in zebrafish wnt2bb mutants; in these animals, hepatocytes regenerated but their proliferation was greatly reduced. CONCLUSIONS:BECs contribute to regenerating hepatocytes after substantial hepatocyte depletion in zebrafish, thereby leading to recovery from severe liver damage.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Choi TY,Ninov N,Stainier DY,Shin D

doi

10.1053/j.gastro.2013.10.019

subject

Has Abstract

pub_date

2014-03-01 00:00:00

pages

776-88

issue

3

eissn

0016-5085

issn

1528-0012

pii

S0016-5085(13)01493-5

journal_volume

146

pub_type

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