TY - JOUR
T1 - C/EBPβ contributes to hepatocyte growth factor-induced replication of rodent hepatocytes
AU - Wang, Bin
AU - Gao, Cuihua
AU - Ponder, Katherine Parker
N1 - Funding Information:
We thank Susan Kennedy and Shi-Rong Cai for technical assistance, Rebecca Taub, and Steve McKnight for cDNA probes, Valerie Poli for C/EBPβ-deficient mice, and Linda Greenbaum for shipping these mice to us, This work was supported by the National Institutes of Health (R01 DK54061 awarded to KPP).
PY - 2005/8
Y1 - 2005/8
N2 - Background/Aims: Hepatocyte replication can be induced in vivo by hepatocyte growth factor (HGF), which might be used for gene therapy or to promote liver regeneration. However, the biochemical steps critical for this process are not clear. C/EBPβ and C/EBPα are liver-enriched transcription factors that induce and inhibit hepatocyte replication, respectively. Because of their role in hepatocyte replication, this study examined the effect of HGF upon C/EBP proteins in vivo. Methods: Rats were treated with HGF, and the effect upon C/EBPs was evaluated in liver extracts. Normal or C/EBPβ-deficient mice were treated with HGF, and the effect upon hepatocyte replication was determined. Results: HGF had no effect in rat liver upon C/EBPα or C/EBPβ mRNA, nuclear protein, or nuclear DNA binding activity. However, HGF increased phosphorylated p90-RSK and ERK to18- and 3-fold normal, respectively. These kinases phosphorylate C/EBPβ and increase its transcriptional activity. The percentage of hepatocytes that replicated in C/EBPβ-deficient mice after HGF administration was only 1.1%, which was lower than the value of 6.6% for hepatocytes from HGF-treated normal mice (P=0.005). Conclusions: C/EBPβ contributes to the induction of hepatocyte replication in response to HGF in rodents, which is likely due to post-translational modifications.
AB - Background/Aims: Hepatocyte replication can be induced in vivo by hepatocyte growth factor (HGF), which might be used for gene therapy or to promote liver regeneration. However, the biochemical steps critical for this process are not clear. C/EBPβ and C/EBPα are liver-enriched transcription factors that induce and inhibit hepatocyte replication, respectively. Because of their role in hepatocyte replication, this study examined the effect of HGF upon C/EBP proteins in vivo. Methods: Rats were treated with HGF, and the effect upon C/EBPs was evaluated in liver extracts. Normal or C/EBPβ-deficient mice were treated with HGF, and the effect upon hepatocyte replication was determined. Results: HGF had no effect in rat liver upon C/EBPα or C/EBPβ mRNA, nuclear protein, or nuclear DNA binding activity. However, HGF increased phosphorylated p90-RSK and ERK to18- and 3-fold normal, respectively. These kinases phosphorylate C/EBPβ and increase its transcriptional activity. The percentage of hepatocytes that replicated in C/EBPβ-deficient mice after HGF administration was only 1.1%, which was lower than the value of 6.6% for hepatocytes from HGF-treated normal mice (P=0.005). Conclusions: C/EBPβ contributes to the induction of hepatocyte replication in response to HGF in rodents, which is likely due to post-translational modifications.
KW - CCAAT-enhancer binding protein
KW - Gene therapy
KW - Hepatocyte growth factor
KW - Liver regeneration
UR - http://www.scopus.com/inward/record.url?scp=21844433508&partnerID=8YFLogxK
U2 - 10.1016/j.jhep.2005.02.029
DO - 10.1016/j.jhep.2005.02.029
M3 - Article
C2 - 15922473
AN - SCOPUS:21844433508
SN - 0168-8278
VL - 43
SP - 294
EP - 302
JO - Journal of Hepatology
JF - Journal of Hepatology
IS - 2
ER -