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中国生物工程杂志

China Biotechnology
China Biotechnology  2022, Vol. 42 Issue (1/2): 72-79    DOI: 10.13523/j.cb.2107027
Orginal Article     
Effects of miR-324-3p Targeting GPX4 on Ferroptosis in Prostate Cancer Cells
ZHANG Sai,YE Ji-wei,SHEN Yuan-jing,MU Ke-fei,GUO Xin-wu()
Nanyang Second General Hospital, Nanyang 473000, China
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Abstract  

Objective: To explore the effects of miR-324-3p on prostate cancer (PCa) cell ferroptosis and its underlying mechanism. Methods: qRT-PCR was performed to detect the expression of miR-324-3p and glutathione peroxidase 4 (GPX4) mRNA in PCa tissues, matched adjacent tissues, and cell lines. Western blot was employed to examine the protein level of GPX4 in PCa cell lines and normal prostate epithelial cells. CCK-8 assay was used to evaluate cell proliferation. The levels of glutathione (GSH), lipid oxidation, and reactive oxygen species (ROS) were determined using GSH detection assay kit, lipid peroxidation MDA assay kit and DCFH-DA fluorescent probe assay. Dual-luciferase reporter gene was applied to verify the interaction of miR-324-3p and GPX4. Results: The expression of miR-324-3p in PCa tissues was lower than that in the corresponding paracancerous tissues, and the expression of miR-324-3p was downregulated in PCa cell lines compared with normal prostate epithelial cells. GPX4 was highly-expressed in PCa tissues and cell lines in comparison with the corresponding paracancerous tissues and normal prostate epithelial cells. Dual-luciferase reporter results showed that miR-324-3p was directly targeted to negatively regulate GPX4. Overexpression of miR-324-3p significantly inhibited PCa cell proliferation, reduced GSH production and enhanced the levels of lipid oxidation and ROS; while treatment with the ferroptosis inhibitor Fer-1 or GPX4 reversed the promotion effect of miR-324-3p on ferroptosis in PCa cells. Conclusion: miR-324-3p promoted ferroptosis in PCa cells by targeting negative regulation of GPX4 expression and thus exerted anticancer effects on PCa.



Key wordsProstate cancer      Ferroptosis      miR-324-3p      Glutathione peroxidase 4     
Received: 09 July 2021      Published: 03 March 2022
ZTFLH:  R737.1  
Corresponding Authors: Xin-wu GUO     E-mail: 564622681@qq.com
Cite this article:

ZHANG Sai,YE Ji-wei,SHEN Yuan-jing,MU Ke-fei,GUO Xin-wu. Effects of miR-324-3p Targeting GPX4 on Ferroptosis in Prostate Cancer Cells. China Biotechnology, 2022, 42(1/2): 72-79.

URL:

https://manu60.magtech.com.cn/biotech/10.13523/j.cb.2107027     OR     https://manu60.magtech.com.cn/biotech/Y2022/V42/I1/2/72

Fig.1 The expression of miR-324-3p in PCa tissues and cell lines (a) The expression of miR-324-3p in PCa tissues and matched adjacent tissues was analyzed using TCGA database (b) qRT-PCR was performed to examine the expression of miR-324-3p in PCa tissues (n=20) and adjacent tissues (n=20) (c) The expression of miR-324-3p in PCa cell lines and normal prostate epithelial cells RWPE-1 * P<0.05, *** P<0.001, compared with the normal group; ## P<0.01, ### P<0.001, compared with the RWPE-1 cells
Fig.2 Effect of miR-324-3p overexpression on proliferation, GSH level, lipid oxidation level and ROS level in PCa cells (a) CCK-8 assay was employed to evaluate the proliferation of both DU145 and PC3 cells (b) The levels of GSH in both DU145 and PC3 cells were measured using GSH detection assay kit (c) The levels of lipid oxidation in both DU145 and PC3 cells were measured using lipid peroxidation MDA assay kit (d) The levels of ROS in both DU145 and PC3 cells were measured using DCFH-DA fluorescent probe assay ### P<0.001, compared with the control group; ## P<0.01, ▲▲ P<0.01, ▲▲▲ P<0.001, compared with the miR-324-3p overexpression group
Fig.3 miR-324-3p directly targeted to negatively regulate GPX4 expression (a) The target binding sites of miR-324-3p and GPX4 (b) The expression of GPX4 in PCa tissues and matched adjacent tissues was analyzed using GEPIA database (c) qRT-PCR assay was performed to examine the mRNA level of GPX4 in PCa tissues and matched adjacent tissues (d) The protein level of GPX4 in PCa cells and RWPE-1 cells was measured using Western blot (e) Dual-luciferase reporter gene assay was used to verify the target relationship between miR-324-3p and GPX4 (f),(g) Western blot was applied to detect the protein level of GPX4 * P<0.05, *** P<0.001
Fig.4 Effect of miR-324-3p on PCa cell proliferation, GSH level, lipid oxidation level, and ROS level via targeting GPX4 (a) The proliferation ability of both DU145 and PC3 cells was determined using CCK-8 assay (b) The levels of GSH in both DU145 and PC3 cells were measured using GSH detection assay kit (c) The levels of lipid oxidation in both DU145 and PC3 cells were measured using lipid peroxidation MDA assay kit (d) The levels of ROS in both DU145 and PC3 cells were measured using DCFH-DA fluorescent probe assay *** P<0.001, compared with the control group; ## P<0.01, ### P<0.001, compared with the miR-324-3p overexpression group
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