PARP1-siRNA suppresses human prostate cancer cell growth and progression.

PARP1-siRNA suppresses human prostate cancer cell growth and progression. Oncol Rep. 2018 Jan 26;: Authors: Lai Y, Kong Z, Zeng T, Xu S, Duan X, Li S, Cai C, Zhao Z, Wu W Abstract Poly (ADP-ribose) polymerase (PARP) inhibitors, such as olaparib or rucaparib, have shown treatment efficacy in BRCA1/2-deficient tumors. However, since PARP inhibitors (PARPi) mainly modulate the activation of PARP but not its expression, whether small interfering RNA (siRNA) specific to PARP has the same function as PARPi has not been well defined. In the present study it was demonstrated that PARP1-siRNA could reduce prostate cancer (PCa) cell progression regardless of the BRCA1/2 mutation. PARP1 silencing could significantly inhibit PC3 cell migration and invasion. Additionally, PARP1-siRNA also inhibited the proliferation of PC3 and Du145 cells. After the induction of apoptosis by docetaxel, cleaved-caspase3 of DU145 and C4-2 cells increased significantly in the PARP1-siRNA group. In the xenograft nude mouse model, PARP1-siRNA could suppress xenograft tumor size of PC3 cells and produce a more regular morphology. In vitro and in vivo, PARP1 silencing significantly downregulated vimentin expression and upregulated E-cadherin expression, both of which are epithelial-mesenchymal transition (EMT) markers. It has been revealed that PI3K inhibition could sensitize the effect of PARPi. Notably, PARP1-siRNA could suppress the expression of EGFR and p-GSK3β ...
Source: Oncology Reports - Category: Cancer & Oncology Tags: Oncol Rep Source Type: research