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Long-term extensive expansion of mouse hepatic stem/progenitor cells in a novel serum-free culture system.

Abstract：

BACKGROUND & AIMS:The liver has high regenerative potential. We attempted to establish a novel culture system for extensive expansion of fetal mouse hepatic stem/progenitor cells and to characterize cultured cells. METHODS:Hepatic spheroids collected from 6-day floating cultures were cultured on collagen-coated dishes in serum-free conditions in medium containing growth factors. Cultured cells were mainly characterized by immunocytochemistry and flow cytometry or transplanted into adult mice. RESULTS:Approximately 400 expanding hepatic spheroids were generated from every 1 x 10(6) fetal liver cells. Subsequently, highly replicative colonies were subcultured with maintaining colony formation on collagen-coated dishes. These colonies consisted of small immature alpha-fetoprotein-positive cells and hepatocytic and cholangiocytic lineage-committed cells. The immature alpha-fetoprotein-positive cells could be expanded in a reproducible manner at least 5 x 10(5)-fold (which involved at least 30 passages over >6 months) without losing differentiation potential. Flow cytometric analysis showed that all cultured cells expressed CD49f, but not CD34, Thy-1, c-kit, or CD45. Nearly 15% of the cells expressed Sca-1, and approximately 5%-20% of the cells were side population cells. Both sorted side population cells and Sca-1-positive cells (especially side population cells) produced a large number of alpha-fetoprotein-positive cells and lineage-committed cells. Expanded cells had bidirectional differentiation potential and improved serum albumin levels in mice with severe liver damage. CONCLUSIONS:Long-term extensive expansion of transplantable hepatic stem/progenitor cells was reproducibly achieved in a novel serum-free culture system. Moreover, this culture system yielded side population and Sca-1-positive cell populations that included hepatic stem/progenitor cells with differentiation and proliferation properties.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Tsuchiya A,Heike T,Fujino H,Shiota M,Umeda K,Yoshimoto M,Matsuda Y,Ichida T,Aoyagi Y,Nakahata T

doi

10.1053/j.gastro.2005.03.030

keywords:

subject

Has Abstract

pub_date

2005-06-01 00:00:00

pages

2089-104

issue

eissn

0016-5085

issn

1528-0012

pii

S0016508505004476

journal_volume

128

pub_type

杂志文章

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Long-term extensive expansion of mouse hepatic stem/progenitor cells in a novel serum-free culture system.