Differential gene expression profiles in the steatosis/fibrosis model of rat liver by chronic administration of carbon tetrachloride.
Global gene expression profile was analyzed by microarray analysis of rat liver RNA after chronic carbon tetrachloride (CCl(4)) administration. Rats received 0.5 ml CCl(4)/kg three times a week, and the liver samples were obtained after 0, 30, 60, and 90 days of injection. Histopathologic studies of liver tissues enabled the classification of the CCl(4) effect into mild and severe fatty liver/steatosis (30 and 60 days, respectively) and fibrosis/cirrhosis (90 days) stages. The expression levels of 4,900 clones on a custom rat gene microarray were analyzed and the results were confirmed by semi-quantitative RT-PCR. Four hundred thirty-eight clones were differentially expressed with more than a 1.625-fold difference (which equals 0.7 in log2 scale) at one or more time points. Multiple genes involved in lipid metabolism and ribosome biogenesis showed differential transcript levels upon chronic CCl(4) administration, which was previously seen in acute rat model as well. In addition, a total of 149 clones were identified as fibrosis/cirrhosis-specific genes by either fold changes or Significance Analysis of Microarrays. In conclusion, we report microarray analysis results in rat liver upon chronic CCl(4) administration with a full chronological profile that not only covered fatty liver/steatosis but also later points of fibrosis/cirrhosis. These data will provide the insight of specific gene expression profiles that is implicated in the multistep process of fatty liver/steatosis and fibrosis/cirrhosis after chronic hepatotoxin exposure.
Chung
Heekyoung
H
Department of Pathology, College of Medicine, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea.
Hong
Doo-Pyo
DP
Kim
Hyun-Jun
HJ
Jang
Ki-Seok
KS
Shin
Dong-Mi
DM
Ahn
Joon-Ik
JI
Lee
Yong-Sung
YS
Kong
Gu
G
D000410:Alanine Transaminase / Q000097:blood; D000818:Animals; D001219:Aspartate Aminotransferases / Q000097:blood; D002251:Carbon Tetrachloride / Q000008:administration & dosage* / Q000633:toxicity; D004195:Disease Models, Animal; D004334:Drug Administration Schedule; D005234:Fatty Liver / Q000097:blood / Q000139:chemically induced* / Q000235:genetics; D020869:Gene Expression Profiling / Q000145:classification / Q000379:methods*; D008103:Liver Cirrhosis / Q000097:blood / Q000139:chemically induced* / Q000235:genetics; D008297:Male; D046228:Microarray Analysis / Q000379:methods; D051381:Rats; D017207:Rats, Sprague-Dawley; D013997:Time Factors
D002251:Carbon Tetrachloride; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase