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Objective: The aim of the research was to study whether microRNA-15a (miR-15a) oligonucleotide could inhibitcell growth and enhance cytarabine (Ara-C)-induced apoptosis in Raji cells. Methods: Transfecting miR-15a oligonucleotideinto Raji cells with LipofectamineTM 2000, and then combined with Ara-C. IC50 value and cell proliferation were detected byCCK8 assay; the expression levels of Bcl-2 mRNA and protein were evaluated by RT-PCR and indirect immuno-fluorescence.The apoptotic cells were observed by Hoechst Dyeing; AnnexinV/PI double dyeing method was used to detect the cellapoptotic rate by Flow Cytometry (FCM). Results: After Raji cells were transfected with miR-15a oligonucleotide for 48 h, Bcl-2 protein expression levels obviously decreased, however, there was no difference in Bcl-2 mRNA levels, as compared withthe control group and blank group (P < 0.05). CCK8 assay showed that miR-15a oligonucleotide decreased the cell growth at24, 48 and 72 h, moreover, miR-15a oligonucleotides combined with Ara-C obviously decreased the cell growth than miR-15agroup, Ara-C group and scrambled oligonucleotides (SODN) + Ara-C group. Meanwhile, miR-15a oligonucleotides combinedwith Ara-C significantly decreased IC50 of Ara-C (10.41 μg/mL), which were obviously lower than those of Ara-C group (15.43μg/mL) and SODN plus Ara-C group (14.92 μg/mL). Plenty of apoptotic cells could be seen with Hoechst dyeing. AnnexinV/PIdouble dying assays by FCM indicated that the cell apoptotic rates in earlier period and late period of miR-15a + Ara-C groupwere 20.93% and 25.27%, respectively, which were obviously higher than those of miR-15a group, Ara-C group and SODNplus Ara-C group. Conclusion: miR-15a oligonucleotides can inhibit cell growth and enhance Ara-C-induced apoptosis inRaji cells.