[RNA interference-mediated silencing of MAT 2A gene attenuates growth and induces apoptosis of hepatoma cells].
OBJECTIVE
To investigate the effect of short interfering RNA targeting MAT 2A on growth and apoptosis of hepatoma cells.


METHODS
The four siRNA against MAT 2A gene were transcript synthesized intracelluarly by expressed templates of plasmid vector pSilence-2.1-U6. We inserted the target sequence of MAT 2A gene into the upstream of the reporter gene in order to construct the recombinant plasmid vector plucA-MAT 2A. The recombinant plasmid and siRNA-producing plasmid were co-transfected into 293 T cells using this construct via lipofectamine methods. The inhibition effect was detected by measuring luciferase activity in the cell lysate to screen the effective siRNA, and then, the effective siRNA was transfected into Bel-7402 cells. The effect of siRNA treatment on the MAT 2A mRNA level and the MAT activity of hepatoma cells were measured. In order to study the effect of short interfering RNA targeting MAT 2A on growth and apoptosis of hepatoma cells, the tumor cell killing rate was analyzed by MTT method and the rate of apoptosis of hepatoma cells was evaluated by flow cytometry.


RESULTS
The two siRNA among the four siRNA displayed inhibitory effect on the lucifermase expression with the inhibitory rates of 81% and 89% respectively. The expression of MAT 2A mRNA in Bel-7402 cells was specifically inhibited and the MAT activity in Bel-7402 cells was decreased. Furthermore, silencing of the MAT 2A gene by RNAi significantly inhibited hepatoma cell growth and led to induction of apoptosis.


CONCLUSIONS
RNA interference-mediated silencing of MAT 2A gene attenuates growth and induces apoptosis of hepatoma cells; MAT 2A is an ideal target of gene-specific therapy for liver cancer.
Liu
Quan-yan
QY
Department of General Sugery, Zhongnan Hospital, Wuhan University, Wuhan 430071, China.
Liu
Zhi-su
ZS
Wu
Kai-lang
KL
Zhu
Ying
Y
D000818:Animals; D017209:Apoptosis / Q000502:physiology*; D006528:Carcinoma, Hepatocellular / Q000473:pathology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D015972:Gene Expression Regulation, Neoplastic; D020868:Gene Silencing; D015316:Genetic Therapy; D008113:Liver Neoplasms / Q000473:pathology*; D008716:Methionine Adenosyltransferase / Q000235:genetics*; D034622:RNA Interference; D051381:Rats
D008716:Methionine Adenosyltransferase