This invention relates to a DNA containing uncoupling protein-2 (UCP-2) promoter region containing the regulator sequence, a transformant transformed with the DNA, a method for screening a compound or its salt that promotes or inhibits UCP-2 promoter activity characterized by use of the transformant, a method for screening an antiobestic drug, an antidiabetic drug, a depressor, an antihyperlipemic drug, and an antipyretic drug characterized by use of the transformant, a kit for screening a compound or its salt that promotes or inhibits UCP-2 promoter activity characterized by use of the transformant, and pharmaceutical composition containing a compound or its salt that promotes or inhibits UCP-2 promoter activity obtained using the screening method or the screening kit.