SUMOylation of PPARγ by RGL antagonizes LPS-induced chemokine expression and NCoR degradation.

<p>HK-2 cells were transfected with siPIAS1 to knock down PIAS1, or transfected with sicontrol as controls. Two days after transfection, IL-8 and MCP-1 mRNA were quantified after incubated with 10 µM RGL for 2 hours followed by stimulation with LPS 1 μg/ml for 4 hours in HK-2 cells and HK-2/PIAS1-knockdown cells. Quantification of mRNA level was performed by real-time PCR. (A) Knockdown efficience of PIAS1 mRNA by siRNA. (B) The expression of IL-8 mRNA in different groups. (C) The expression of MCP-1 mRNA in different groups. (D) Two days after transfection, Nuclear protein was extracted after incubated with 10 µM RGL for 2 hours followed by stimulation with 1 μg/ml LPS for 30 minutes in HK-2 cells. NCoR protein were quantitated by immunoblotting analysis in different groups. The results are representative of three independent experiments. *<i>P</i><0.05 compared to the control group; ^<i>#</i><i>P</i><0.05 compared to the LPS-treated group.