Digestive Diseases and Sciences

, Volume 50, Issue 10, pp 1755–1763

Side Population Cells Derived from Adult Human Liver Generate Hepatocyte-like Cells In Vitro

  • Sunny Zaheed Hussain
  • Stephen C. Strom
  • Martha R. Kirby
  • Sean Burns
  • Saskia Langemeijer
  • Takahiro Ueda
  • Matthew Hsieh
  • John F. Tisdale


We sought to determine whether hepatic side population (SP) cells derived from adult human liver possess the potential of a novel candidate hepatic stem cell. Human cadaveric donor liver was subjected to collagenase perfusion and hepatocytes were separated from nonparenchymal cells by differential centrifugation. SP cells were isolated from the nonparenchymal portion after Hoechst 33342 staining. Since CD45 is a panleukocyte antigen, CD45-negative SP cells were separated from the vast majority of CD45-positive SP cells (90%), and hepatic growth medium was used to culture both groups. Both CD45-negative and CD45-positive hepatic SP cells generated colonies in the hepatic growth medium in 2–3 weeks. The colonies yielded large cells morphologically consistent with human hepatocytes, demonstrating granule-rich cytoplasm, dense, often double nuclei, and intracellular lipofuscin pigment. The cultured cells from both sources were positive for markers of human hepatocytes: HepPar, cytokeratin 8 (CK8), and human albumin. Reverse transcriptase–polymerase chain reaction (RT-PCR) performed on both groups demonstrated positivity for additional liver markers including human albumin, CK18, α-1 anti-trypsin, and the human cytochrome P450 enzyme CYP2B6. Double immunostaining (CD45 and HepPar) and RT-PCR confirmed that the hepatocyte-like cells derived from the CD45-negative SP cells acquired HepPar positivity but had no detectable CD45 antigen expression. In contrast, the cultured cells derived from the CD45-positive SP cells also acquired HepPar positivity, but only a minimal fraction expressed the CD45 antigen. We conclude that hepatic SP cells derived from the nonparenchymal portion of human liver are a potential source of human hepatocytes irrespective of their CD45 status, and further animal studies will be required to assess their regenerative potential.

Key Words

human side population stem cells hepatic CD45 


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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • Sunny Zaheed Hussain
    • 1
    • 2
  • Stephen C. Strom
    • 3
  • Martha R. Kirby
    • 4
  • Sean Burns
    • 2
  • Saskia Langemeijer
    • 2
  • Takahiro Ueda
    • 2
  • Matthew Hsieh
    • 2
  • John F. Tisdale
    • 2
  1. 1.Division of GastroenterologyChildren's National Medical CenterWashington
  2. 2.Molecular and Clinical Hematology BranchNIDDK, National Institutes of HealthBethesdaUSA
  3. 3.Department of PathologyUniversity of PittsburghBethesdaUSA
  4. 4.National Human Genome Research InstituteNIHBethesdaUSA

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