Abstract
We have developed an in vivo mouse model, the green fluorescent protein (GFP)/carbon tetrachloride (CCl4) model, and have previously reported that transplanted GFP-positive bone marrow cells (BMCs) differentiate into hepatocytes via hepatoblast intermediates. Here, we have investigated the growth factors that are closely related to the differentiation of transplanted BMCs into hepatocytes, and the way that a specific growth factor affects the differentiation process in the GFP/CCl4 model. We performed immunohistochemical analysis to identify an important growth factor in our model, viz., fibroblast growth factor (FGF). In liver samples, the expression of FGF1 and FGF2 and of FGF receptors (FGFRs; FGFR1, FGFR2) was significantly elevated with time after bone marrow transplantation (BMT) compared with other factors, and co-expression of GFP and FGFs or FGFRs could be detected. We then analyzed the effect and molecular mechanism of FGF signaling on the enhancement of BMC differentiation into hepatocytes by immunohistochemistry, immunoblotting, and microarray analysis. Treatment with recombinant FGF (rFGF), especially rFGF2, elevated the repopulation rate of GFP-positive cells in the liver and significantly increased the expression of both Liv2 (hepatoblast marker) and albumin (hepatocyte marker). Administration of rFGF2 at BMT also raised serum albumin levels and improved the survival rate. Transplantation of BMCs with rFGF2 specifically activated tumor necrosis factor-alpha (TNF-α) signaling. Thus, FGF2 facilitates the differentiation of transplanted BMCs into albumin-producing hepatocytes via Liv2-positive hepatoblast intermediates through the activation of TNF-α signaling. Administration of FGF2 in combination with BMT improves the liver function and prognosis of mice with CCl4-induced liver damage.
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Abbreviations
- BMC:
-
bone marrow cell
- BMT:
-
bone marrow transplantation
- GFP:
-
green fluorescent protein
- CCl4 :
-
carbon tetrachloride
- SOM:
-
self-organizing map
- FGF:
-
fibroblast growth factor
- EGF:
-
epidermal growth factor
- EGFR:
-
epidermal growth factor receptor
- FGFR:
-
fibroblast growth factor receptor
- HGF:
-
hepatocyte growth factor
- VEGF:
-
vascular endothelial growth factor
- VEGFR:
-
vascular endothelial growth factor receptor
- PDGF:
-
platelet-derived growth factor
- PDGFR:
-
platelet-derived growth factor receptor
- TGFβ:
-
transforming growth factor β
- TGFβR:
-
transforming growth factor β receptor
- rFGF:
-
recombinant fibroblast growth factor
- TNF-α:
-
tumor necrosis factor-α
- TNFIP3:
-
tumor necrosis factor-α induced protein 3
- NF-κB:
-
nuclear factor-κB
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Acknowledgements
We thank Dr. Masaru Okabe (Genome Research Center, Osaka University) for the gift of GFP transgenic mice and Mr. Jun Oba for valuable technical support.
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This study was supported by Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (nos. 13470121, 13770262, 15790348, 16390211, and 16590597) and for translational research from the Ministry of Health, Labor and Welfare (H-trans-5).
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Ishikawa, T., Terai, S., Urata, Y. et al. Fibroblast growth factor 2 facilitates the differentiation of transplanted bone marrow cells into hepatocytes. Cell Tissue Res 323, 221–231 (2006). https://doi.org/10.1007/s00441-005-0077-0
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DOI: https://doi.org/10.1007/s00441-005-0077-0