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Epithelial cell adhesion molecule (EpCAM) marks hepatocytes newly derived from stem/progenitor cells in humans.

 So-Mi Yoon  ;  Domniki Gerasimidou  ;  Reiichiro Kuwahara  ;  Prodromos Hytiroglou  ;  Jeong Eun Yoo  ;  Young Nyun Park  ;  Neil D. Theise 
 HEPATOLOGY, Vol.53(3) : 964-973, 2011 
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Adult ; Analgesics/therapeutic use* ; Double-Blind Method ; Female ; Humans ; Mastectomy* ; Middle Aged ; Pain Measurement ; Pain, Postoperative/drug therapy* ; Pregabalin ; gamma-Aminobutyric Acid/adverse effects ; gamma-Aminobutyric Acid/analogs & derivatives* ; gamma-Aminobutyric Acid/therapeutic use
Epithelial cell adhesion molecule (EpCAM) is a surface marker on human hepatic stem/progenitor cells that is reported as absent on mature hepatocytes. However, it has also been noted that in cirrhotic livers of diverse causes, many hepatocytes have EpCAM surface expression; this may represent aberrant EpCAM expression in injured hepatocytes or, as we now hypothesize, persistence of EpCAM in hepatocytes that have recently derived from hepatobiliary progenitors. To evaluate this concept, we investigated patterns of EpCAM expression in hepatobiliary cell compartments of liver biopsy specimens from patients with all stages of chronic hepatitis B and C, studying proliferation, senescence and telomere lengths. We found that EpCAM(+) hepatocytes were rare in early stages of disease, became increasingly prominent in later stages in parallel with the emergence of ductular reactions, and were consistently arrayed around the periphery of cords of keratin 19(+) hepatobiliary cells of the ductular reaction, with which they shared EpCAM expression. Proliferating cell nuclear antigen (proliferation marker) and p21 (senescence marker) were both higher in hepatocytes in cirrhosis than in normal livers, but ductular reaction hepatobiliary cells had the highest proliferation rate, in keeping with being stem/progenitor cell-derived transit amplifying cells. Telomere lengths in EpCAM(+) hepatocytes in cirrhosis were higher than EpCAM(-) hepatocytes (P < 0.046), and relatively shorter than those in the corresponding ductular reaction hepatobiliary cells (P = 0.057). CONCLUSION: These morphologic, topographic, immunophenotypic, and molecular data support the concept that EpCAM(+) hepatocytes in chronic viral hepatitis are recent progeny of the hepatobiliary stem/progenitor cell compartment through intermediates of the transit amplifying, ductular reaction hepatobiliary cells.
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1. College of Medicine (의과대학) > Dept. of Pathology (병리학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Medical Research Center (임상의학연구센터) > 1. Journal Papers
Yonsei Authors
Park, Young Nyun(박영년) ORCID logo https://orcid.org/0000-0003-0357-7967
Yoo, Jeong Eun(유정은) ORCID logo https://orcid.org/0000-0001-9990-279X
Yoon, So Mi(윤소미)
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