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American Journal of Pathology, Vol 150, 591-602, Copyright © 1997 by American Society for Investigative Pathology

REGULAR ARTICLES

Selective bipotential differentiation of mouse embryonic hepatoblasts in vitro

LE Rogler
Marion Bession Liver Center, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY 10461, USA.

A line of hepatic endoderm cells, hepatoblast cell line 3 (HBC-3), was derived from the liver diverticulum of the mouse on day 9.5 of gestation by culture on a mitomycin C treated STON+ feeder layer in a hepatoblast culture medium consisting of Dulbecco's modified Eagle's medium, nonessential amino acids, fetal calf serum, and beta- mercaptoethanol. This line, HBC-3, stains positively for alpha- fetoprotein, albumin, and cytokeratin 14 (CK-14), protein markers expressed by the embryonic liver diverticulum, indicating that HBC-3 cells retain an undifferentiated hepatoblast phenotype. HBC-3 cells acquire hepatocyte-like ultrastructural characteristics, including bile canaliculi, peroxisomes, and glycogen granules, when maintained in culture for 3 weeks without passage. Treatment with dimethylsulfoxide or sodium butyrate induces a rapid hepatocytic differentiation. The cells cease to express alpha-fetoprotein and CK-14, maintain albumin expression, and become positive for glucose-6-phosphatase activity (a profile consistent with differentiation along the hepatocyte lineage). On Matrigel, HBC-3 cells form elaborate ductular structures, which are positive for gamma-glutamyl transpeptidase and CK-14 and CK-19 and do not express detectable amounts of albumin, a phenotypic change consistent with differentiation along the bile ductular lineage. Thus, HBC-3 cells behave in culture as bipotential hepatoblasts and provide a model system to identify factors that regulate bipotential differentiation in the liver.

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