Expression patterns of cytokine, growth factor and cell cycle-related genes after partial hepatectomy in rats with thioacetamide-induced cirrhosis.
OBJECTIVE
To examine the differences in the responses of normal and cirrhotic livers to partial hepatectomy in relation to the factors influencing liver regeneration.


METHODS
Cirrhosis was induced in rats by administration of thioacetamide. Untreated rats were used as controls. The control rats as well as the cirrhotic rats were subjected to 70% partial hepatectomy. At different time points after hepatectomy, the livers were collected and the levels of cytokines, growth factors and cell cycle proteins were analyzed.


RESULTS
After hepatectomy, the cirrhotic remnant expressed significantly lower levels of cyclin D1, its kinase partner, cdk4, and cyclin E as compared to the controls up to 72 h post hepatectomy. Significantly lower levels of cyclin A and cdk2 were also observed while the cdk inhibitor, p27 was significantly higher. In addition, the cirrhotic group had lower IL-6 levels than the control group at all time points up to 72 h following resection.


CONCLUSIONS
The data from our study shows that impaired liver regeneration in cirrhotic remnants is associated with low expression of cyclins and cdks. This might be the consequence of the low IL-6 levels in cirrhotic liver remnant which would in turn influence the actions of transcription factors that regulate genes involved in cell proliferation and metabolic homeostasis during the regeneration process.
Department of Biochemistry, Faculty of Medicine, National University of Singapore, MD7, 8 Medical Drive, S117597, Singapore.
Shu
S
Yang
Chon Kar
CK
Leow
Theresa May Chin
TM
Tan
D000818:Animals; D015153:Blotting, Western; D018797:Cell Cycle Proteins / Q000096:biosynthesis* / Q000235:genetics; D049109:Cell Proliferation; D016207:Cytokines / Q000096:biosynthesis / Q000235:genetics; D005786:Gene Expression Regulation; D006133:Growth Substances / Q000096:biosynthesis*; D006498:Hepatectomy; D006706:Homeostasis; D008099:Liver / Q000378:metabolism / Q000473:pathology / Q000601:surgery; D008103:Liver Cirrhosis / Q000139:chemically induced / Q000235:genetics / Q000378:metabolism* / Q000601:surgery*; D008115:Liver Regeneration / Q000235:genetics; D008297:Male; D051381:Rats; D011920:Rats, Inbred WF; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013853:Thioacetamide
D018797:Cell Cycle Proteins; D016207:Cytokines; D006133:Growth Substances; D013853:Thioacetamide