Effects of the augmenter of liver regeneration on the biological behavior of hepatocellular carcinoma.
OBJECTIVE
To take advantage of the small interfering ribonucleic acid (siRNA) targeting the human augmenter of liver regeneration (hALR) and anti-hALR monoclonal antibody (McAb) to inhibit the function of hALR, and to demonstrate whether the growth of hepatoma is influenced by siRNA targeting hALR and anti-hALR McAb through inhibiting expression of hALR.


METHODS
This study was conducted in the Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Institute for Viral Hepatitis, Chongqing Medical University, China, between January 2005 and May 2007. We transfected siRNA plasmid pSIALR-A, which targeted the complementary deoxyribonucleic acid (cDNA) of hALR and the unrelated control plasmid pSIALR-B into human hepatocellular liver carcinoma cell line (HepG2) cells. Then, the proliferation of HepG2 cells, after being treated with pSIALR-A and anti-hALR McAb was detected. The growth of the xenograft tumor was observed after being treated with pSIALR-A and anti-hALR McAb in nude mice.


RESULTS
We successfully constructed expressing plasmid pSIALR-A and pSIALR-B. The pSIALR-A inhibited the expression of hALR in HepG2 cells significantly. The siRNA targeting hALR and anti-hALR McAb inhibited obviously the growth of HepG2 cells in vitro. siRNA targeting hALR and anti-hALR McAb significantly inhibited the growth of xenograft tumor in 5 nude mice. Anti-hALR McAb inhibited apparently the autonomous growth of HepG2 cells.


CONCLUSIONS
Our results demonstrated that anti-hALR McAb inhibited the autonomous growth of hepatoma cells obviously, moreover, hALR maintained the autonomous growth of hepatoma cells in vitro through an autocrine mechanism.
Tang
Lin
L
Key Laboratory of Molecular Biology for Infectious Diseases, Ministry of Education, Institute for Viral Hepatitis, Chongqing University of Medical Sciences, Chongqing, China.
Sun
Hang
H
Zhang
Lin
L
Deng
Jian C
JC
Guo
Hui
H
Zhang
Ling
L
Liu
Qi
Q
D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D006528:Carcinoma, Hepatocellular / Q000473:pathology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D005260:Female; D007150:Immunohistochemistry; D008113:Liver Neoplasms / Q000473:pathology*; D008115:Liver Regeneration / Q000502:physiology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D011506:Proteins / Q000502:physiology*; D034741:RNA, Small Interfering / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014162:Transfection; D050862:Oxidoreductases Acting on Sulfur Group Donors
D000911:Antibodies, Monoclonal; D011506:Proteins; D034741:RNA, Small Interfering; C088825:GFER protein, rat; D050862:Oxidoreductases Acting on Sulfur Group Donors