PUMA decreases the growth of prostate cancer PC-3 cells independent of p53

Shan,Zhengfei; Liu,Qingzuo; Li,Yuling; Wu,Jitao; Sun,Dekang; Gao,Zhenli

doi:10.3892/ol.2017.5657

PUMA decreases the growth of prostate cancer PC-3 cells independent of p53

Authors:
- Zhengfei Shan
- Qingzuo Liu
- Yuling Li
- Jitao Wu
- Dekang Sun
- Zhenli Gao
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Affiliations: Department of Urology, Yantai Yuhuangding Hospital Affiliated to Medical College of Qingdao University, Yantai, Shandong 264000, P.R. China, Department of Pathophysiology, Binzhou Medical University, Yantai, Shandong 264000, P.R. China
Published online on: January 27, 2017 https://doi.org/10.3892/ol.2017.5657
Pages: 1885-1890

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Abstract

PUMA (p53 upregulated modulator of apoptosis), a member of the B‑cell lymphoma 2 (Bcl-2) protein family, is a pro‑apoptotic protein. PUMA expression is modulated by the tumor suppressor p53. PUMA has a role in rapid cell death via p53‑dependent and ‑independent mechanisms. To evaluate whether p53 is required for PUMA‑mediated apoptosis in prostate cancer cells, p53 protein was silenced in human prostate cancer PC‑3 cells by using p53 small interfering RNA (siRNA). The interference efficiency of p53 on RNA and protein levels was detected by reverse transcription-quantitative polymerase chain reaction and western blotting. Cell proliferation and p21 expression were subsequently examined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and western blot analysis, respectively. p53‑silenced or control PC‑3 cells were transfected with pCEP4‑(hemagglutinin)‑PUMA plasmid, or non‑carrier plasmid. Enzyme‑linked immunosorbent assay was used to determine cell apoptosis by measuring histone release and caspase‑3 activation, and MTT assay was used to measure cell viability. In addition, the expression of pro‑apoptosis protein Bax and anti‑apoptosis protein Bcl‑2 were evaluated. The results of the present study revealed that p53 siRNA significantly suppressed p53 RNA and protein expression in PC‑3 cells. Deficiency of p53 increased the cell growth rate and decreased p21 expression. However, PUMA overexpression remained able to induce apoptosis in p53‑silenced and control cells by increasing Bax expression and decreasing Bcl‑2 expression, leading to the activation of caspase‑3. These results suggest that PUMA may mediate apoptosis of prostate cancer PC‑3 cells, potentially independently of p53. Furthermore, PUMA gene treatment to induce cancer cell apoptosis may be more efficient compared with p53‑dependent apoptosis, where loss of p53 expression or function may lead to limited efficacy of PUMA expression. Therefore, the present study proposes the significant hypothesis that increasing PUMA expression may be an effective approach for the treatment of prostate cancer, regardless of p53 status.

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