Bmi1 promotes hepatic stem cell expansion and tumorigenicity in both Ink4a/Arf-dependent and -independent manners in mice

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
Tetsuhiro ChibaAtsushi Iwama

Abstract

We previously reported that forced expression of Bmi1 (B lymphoma Moloney murine leukemia virus insertion region 1 homolog) in murine hepatic stem/progenitor cells purified from fetal liver enhances their self-renewal and drives cancer initiation. In the present study, we examined the contribution of the Ink4a/Arf tumor suppressor gene locus, one of the major targets of Bmi1, to stem cell expansion and cancer initiation. Bmi1(-/-) Delta-like protein (Dlk)(+) hepatic stem/progenitor cells showed de-repression of the Ink4a/Arf locus and displayed impaired growth activity. In contrast, Ink4a/Arf(-/-) Dlk(+) cells gave rise to considerably larger colonies containing a greater number of bipotent cells than wild-type Dlk(+) cells. Although Ink4a/Arf(-/-) Dlk(+) cells did not initiate tumors in recipient nonobese diabetic/severe combined immunodeficiency mice, enforced expression of Bmi1 in Ink4a/Arf(-/-) Dlk(+) cells further augmented their self-renewal capacity and resulted in tumor formation in vivo. Microarray analyses successfully identified five down-regulated genes as candidate downstream targets for Bmi1 in hepatic stem/progenitor cells. Of these genes, enforced expression of sex determining region Y-box 17 (Sox17) in Dlk(+) c...Continue Reading

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Citations

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