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2016 ; 64
(5
): 1137-1146
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Characterization of hepatic stellate cells, portal fibroblasts, and mesothelial
cells in normal and fibrotic livers
#MMPMID26806818
Lua I
; Li Y
; Zagory JA
; Wang KS
; French SW
; Sévigny J
; Asahina K
J Hepatol
2016[May]; 64
(5
): 1137-1146
PMID26806818
show ga
BACKGROUND & AIMS: Contribution of hepatic stellate cells (HSCs), portal
fibroblasts (PFs), and mesothelial cells (MCs) to myofibroblasts is not fully
understood due to insufficient availability of markers and isolation methods. The
present study aimed to isolate these cells, characterize their phenotypes, and
examine their contribution to myofibroblasts in liver fibrosis. METHODS: Liver
fibrosis was induced in Collagen1a1-green fluorescent protein (Col1a1(GFP)) mice
by bile duct ligation (BDL), 3,5-diethoxycarbonyl-1,4-dihydrocollidine (DDC)
diet, or CCl4 injections. Combining vitamin A (VitA) lipid autofluorescence and
expression of GFP and glycoprotein M6a (GPM6A), we separated HSCs, PFs, and MCs
from normal and fibrotic livers by fluorescence-activated cell sorting (FACS).
RESULTS: Normal Col1a1(GFP) livers broadly expressed GFP in HSCs, PFs, and MCs.
Isolated VitA+ HSCs expressed reelin, whereas VitA-GFP+GPM6A- PFs expressed
ectonucleoside triphosphate diphosphohydrolase-2 and elastin. VitA-GFP+GPM6A+ MCs
expressed keratin 19, mesothelin, and uroplakin 1b. Transforming growth factor
(TGF)-?1 treatment induced the transformation of HSCs, PFs, and MCs into
myofibroblasts in culture. TGF-?1 suppressed cyclin D1 mRNA expression in PFs but
not in HSCs and MCs. In biliary fibrosis, PFs adjacent to the bile duct expressed
?-smooth muscle actin. FACS analysis revealed that HSCs are the major source of
GFP+ myofibroblasts in the injured Col1a1(GFP) mice after DDC or CCl4 treatment.
Although PFs partly contributed to GFP+ myofibroblasts in the BDL model, HSCs
were still dominant source of myofibroblasts. CONCLUSION: HSCs, PFs, and MCs have
distinct phenotypes, and PFs partly contribute to myofibroblasts in the portal
triad in biliary fibrosis.