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Cancer Research and Treatment > Volume 33(3); 2001 > Article
Cancer Research and Treatment 2001;33(3): 256-263. doi: https://doi.org/10.4143/crt.2001.33.3.256
Study on the Expression of Insulin-like Growth Factor II (IGF- II) in Hepatocellular Carcinoma Cells and Developing Rat Embryos
Byung Kun Lee, Seung Geun Shin, Jin Hye Seo, Myung Ho Bae, You Mie Lee, Seun Ja Park, Byung Chae Park, Kyu Won Kim, Ja Young Koo
1Department of Internal Medicine, School of Medicine, KosinUniversity, Busan.
2Department of Molecular Biology, Pusan National University,Busan.
3College of Pharmacy, Seoul National University, Seoul,Korea.
  Published online: June 30, 2001.
The insulin-like growth factor II (IGF-II) gene expresses a family of transcripts in embryonic/fetal tissue, and also highly was expressed during hepatocellular carcinogenesis. In this study, we showed that IGF-II mRNA and protein levels are detected in rat embryo, HepG2 human hepatoma cells and Chang liver cells.
This study included sections of rat embryos 7~17 days post coitum (d.p.c), HepG2 cells and Chang liver cells. Using immunohistochemistry, Northern blotting and Western blotting, we observed the expression of IGF-II in the rat embryo, HepG2 cells and Chang liver cells.
We localized IGF-II gene products in sections of rat embryo 7~17 d.p.c by performing immunohistochemistry. The IGF-II was mainly expressed in the proximal endoderm and ectoplacental cone between 7 and 9 d.p.c. At 10 d.p.c. the expression was localized at the heart primodium as well as the proximal endoderm, and at 11 d.p.c. the IGF-II was expressed in the liver and heart. After 12 d.p.c. and 14 d.p.c., the expression was also detected in the brain, muscle and bone, and head mesenchyme, respectively. While the expression of IGF-II protein was not detected in the normal adult liver, intense staining was detected in the heart, liver and choroids plexus at 17 d.p.c.
These results suggest that IGF-II may act as an oncofetal protein during hepatocellular carcinogenesis and embryogenesis.
Key words: IGF-II;Hepatocellular carcinogenesis;Embryogenesis;HepG2
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