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2015 ; 24
(21
): 2467-78
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CD34(+) Liver Cancer Stem Cells Were Formed by Fusion of Hepatobiliary
Stem/Progenitor Cells with Hematopoietic Precursor-Derived Myeloid Intermediates
#MMPMID26192559
Zeng C
; Zhang Y
; Park SC
; Eun JR
; Nguyen NT
; Tschudy-Seney B
; Jung YJ
; Theise ND
; Zern MA
; Duan Y
Stem Cells Dev
2015[Nov]; 24
(21
): 2467-78
PMID26192559
show ga
A large number of cancer stem cells (CSCs) were identified and characterized;
however, the origins and formation of CSCs remain elusive. In this study, we
examined the origination of the newly identified CD34(+) liver CSC (LCSC). We
found that CD34(+) LCSC coexpressed liver stem cell and myelomonocytic cell
markers, showing a mixed phenotype, a combination of hepatobiliary
stem/progenitor cells (HSPCs) and myelomonocytic cells. Moreover, human
xenografts produced by CD34(+) LCSCs and the parental cells, which CD34(+) LCSC
was isolated from, coexpressed liver cancer and myelomonocytic markers, also
demonstrating mixed phenotypes. The xenografts and the parental cells secreted
albumin demonstrating their hepatocyte origin and also expressed cytokines
[interleukin (IL)-1b, IL-6, IL-12A, IL-18, tumor necrosis factor-alpha (TNF-?),
and CSF1] and chemokines (IL-8, CCL2, and CCL5). Expression of these cytokines
and chemokines responded to the stimuli [interferon-? (INF-?), IL-4, and
lipopolysaccharide (LPS)]. Furthermore, human xenografts and the parental cells
phagocytized Escherichia coli. CD34(+) LCSC coexpressed CD45, demonstrating that
its origin appears to be from a hematopoietic precursor. The percentage of cells
positive for OV6, CD34, and CD31, presenting the markers of HSPC, hematopoietic,
and myelomonocytic cells, increased under treatment of CD34(+) LCSC with a drug.
Cytogenetic analysis showed that CD34(+) LCSC contained a greater number of
chromosomes. HBV DNA integrations and mutations in CD34(+) LCSC and the parental
cells were identical to those in the literature or the database. Thus, these
results demonstrated that CD34(+) LCSCs were formed by fusion of HSPC with
CD34(+) hematopoietic precursor-derived myeloid intermediates; it appears that
this is the first report that human CSCs have been formed by the fusion.
Therefore, it represents a significant step toward better understanding of the
formation of human CSC and the diverse origins of liver cancers.