PPARG and psoriasis: miR-203 negatively regulates the expression of LXR-α/PPAR-γ by directly targeting 3′ UTRs of their mRNAs, suggesting that the miR-203-LXR-α /PPAR-γ axis is crucially involved in the hyperproliferative phenotype of psoriatic keratinocytes and may provide drug targets for psoriasis treatment.