Effects of Multiple-target Anti-microRNA Antisense Oligodeoxyribonucleotides on Proliferation and Migration of Gastric Cancer Cells

Backgrounds: To investigate the inhibiting effects of multi-target anti-microRNA antisense oligonucleotide(MTg-AMOs) on proliferation and migration of human gastric cancer cells.
Methods: Single anti-microRNAantisense oligonucleotides (AMOs) and MTg-AMOs for miR-221, 21, and 106a were designed and transfectedinto SGC7901, a gastric cancer cell line, to target the activity of these miRNAs. Their expression was analyzedusing stem-loop RT-PCR and effects of MTg-AMOs on human gastric cancer cells were determined using thefollowing two assay methods: CCK8 for cell proliferation and transwells for migration.
Results: In the CCK-8cell proliferation assay, 0.6 μmol/L was selected as the preferred concentration of MTg-AMOs and incubationtime was 72 hours. Under these experimental conditions, MTg-AMOs demonstrated better suppression of theexpression of miR-221, miR-106a, miR-21 in gastric cancer cells than that of single AMOs (P = 0.014, 0.024;0.038, respectively). Migration activity was also clearly decreased as compared to those in randomized and blankcontrol groups (28 ± 4 Vs 54 ± 3, P <0.01; 28 ± 4 Vs 59 ± 4, P < 0.01).
Conclusions: MTg-AMOs can specificallyinhibit the expression of multiple miRNAs, and effectively antagonize proliferation and migration of gastriccancer cells promoted by oncomirs.