Antiproliferative effect of silencing mTOR gene on MCL Jeko-1 cell line and its mechanism

Objective: To investigate the effect of silencing mTOR gene by RNA interference on proliferation and apoptosis, and its mechanism on mantle cell lymphoma Jeko-1 cell Line.

Methods: The hairpin-like oligonucleotide sequences targeting mTOR gene was designed and transfected into Jeko-1 cells by lipofectamine TM 2000. The mTOR mRNA and protein were detected by RQ-PCR and Western blot. Cell growth was determined by MTT. Cell apoptosis was analyzed by flow cytometry. The expressions of Bcl-2, Bax, procaspase-3, procaspase-9, P70S6K,and p-P70S6K were detected by Western blot.

Results: mTOR mRNA was markedly suppressed by shRNA targeting mTOR. mTOR shRNA suppressed proliferation and induced cells apoptosis of Jeko-1 cells. The cell apoptotic rates were (36.62 ± 3.24)%, (2.58 ± 1.04)%, (1.24 ± 0.30)% respectively, in mTOR shRNA, Neg-shRNA and Blank with statistically significant difference among them (P<0.05). mTOR shRNA down-regulated the expressions of Bcl-2, proCaspase3, proCaspase9 and p-70S6K, up-regulated the expression of Bax.

Conclusions: Deplete of mTOR gene may be realized through inhibiting the Akt/mTOR signaling pathway to promote the cell apoptosis and inhibit cell growth in Jeko-1 cell line.