Sensor siRNAs can be used in high-order combinations.

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Sensor siRNAs can be used in high-order combinations. Sensor siRNAs can be used in high-order combinations. A, U2OS cells were transfected with Sensor siRNAs targeting MAPK pathway genes. Each siRNA was transfected at 2 nmol/L ± a nontargeting siNEG for a total of 14 nmol/L siRNA. Target protein knockdown was assessed by Western blot 72 hours after transfection. B, viability of colorectal cancer cells was measured 5 days after siRNA transfection or treatment with PLX4032 (1 μmol/L). C, apoptosis of colorectal cancer cells was assessed by measuring caspase-3/7 activity 72 hours after siRNA transfection. Apoptosis was adjusted by viability and normalized to a siNEG-transfected control. D, colorectal cancer cells were treated for 72 hours with 5 nmol/L of the indicated siRNA(s) ± siNEG for a total of 30 nmol/L siRNA. Where indicated, cells were treated with AZD6244 (1 μmol/L), BEZ235 (1 μmol/L), or PLX4032 (10 μmol/L for SW48, Caco2, SW620, and SW1116; 1 μmol/L for RKO and LS411N) for 24 hours. Lysates were analyzed for pMEK, pERK, pAKT, and pS6 levels with the ViBE bioanalyzer. ND, not determined. Tina L. Yuan et al. Cancer Discovery 2014;4:1182-1197 ©2014 by American Association for Cancer Research