Carcinogenesis, Teratogenesis & Mutagenesis ›› 2020, Vol. 32 ›› Issue (3): 203-208.doi: 10.3969/j.issn.1004-616x.2020.03.009

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Effects of SF1a-PRLR and ΔS2 SF1a-PRLR on proliferation and microRNA expressionin MCF-7 breast cancer cell

ZHANG Huijuan, HUANG Dayuan, ZHANG Jie, TANG Haiou, XIE Anxin, TAN Dunyong   

  1. Medical Research Center of Jishou University, Jishou 416000, Hunan, China
  • Received:2019-02-25 Revised:2020-02-28 Online:2020-05-31 Published:2020-06-03

Abstract: OBJECTIVE: To investigate the effects of SF1a-PRLR and its variant ΔS2 SF1a-PRLR over-expression on proliferation and microRNA expression in human breast cancer cells (MCF-7). METHODS: SF1a-PRLR and ΔS2 SF1a-PRLR cDNAs were recombined separately into lentivirus by using homologous recombination strategy,and the viruses carrying different genes (including SF1a-PRLR,or ΔS2 SF1a-PRLR cDNA) or not carrying any target gene (control) were transfected into MCF-7 cells,respectively. The stably transfected cells including MCF7-con (control group),MCF7-SF1a-PRLR (SF1a),and MCF7-ΔS2 SF1a-PRLR (ΔS2 SF1a) were obtained through multiple screening with puromycin. Total RNAs were extracted using Trizol reagent,and high-throughput sequencing of small RNAs were performed. In addition, separate sets of the cells were tested using the MTS cell proliferation assay. RESULTS: Cell proliferation assay results show that at 48 h,the D(492) values of the control,SF1a and ΔS2 SF1a groups were 1.85±0.29,2.24±0.26 and 2.57±0.23,with significant differences among them (all P < 0.05). Furthermore, sequencing data show that there were significant differences on microRNA expression among the groups. SF1a induced 176 microRNAs expression changes(32 were up-regulated and 144 were down-regulated) and ΔS2 SF1a induced 206 microRNAs expression changes (52 were up-regulated and 154 were down-regulated). For comparison,4 microRNAs (miR-4454,miR-215-5p,miR-622 and miR-797) were up-regulated and 1 (miR-210-5p) was down-regulated from ΔS2 SF1a-PRLR over-expression. The relative expressions of miR-210-5p in the control,SF1a and ΔS2 SF1a groups were 66.18、31.67 and 13.07,with significant differences among the three groups (all P < 0.05). CONCLUSION: Both SF1a-PRLR and ΔS2 SF1a-PRLR over-expression promoted proliferation of breast cancer cells (MCF-7),and significantly affected the expression of microRNAs in a similar way for most of the detected genes. Several microRNAs such as miR-4454,etc. are affected in a different mode by SF1a PRLR and ΔS2 SF1a-PRLR.

Key words: breast cancer, SF1a-PRLR, ΔS2 SF1a-PRLR, microRNA, differential expression

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