<正>Objective: To construct and identify the recombinant plasmids PPARγ-pSUPER-EGFP for RNA interference. Methods: The pSUPER-EGFP vectors were used to transcribe functional short interfering RNA （siRNA）. Four pairs of 64 nt PPARγsiRNA encoding sequences were inserted into the downstream of the H1 promoter. The recombinant plasmids were confirmed by double digestion with the enzymes and sequencing. Western blotting was used to examine the silencing effect of PPARγgene in RAW264. 7 cells. Following procedures were used to optimize the experiments: the oligonucleotides were incubated 5 min at 95 C and cooled automatically in boiled water bath to anneal

and then phosphorylated oligonucleotides

pSUPER-EGFP plasmids was digested with Bgl II and Hind III . and the product was ligated into digested pSUPER-EGFP plasmids

and transforming the ligation products followed by screening and identifying positive clones. Results:Four kinds of positive clones producing 285 bp fragments were selected. Sequencing further proved their correctness. Four recombinant plasmids containing corresponding PPARγgene-specific target sequences induced the silencing of its target gene more or less. Conclusion: The optimizing method in constructing these recombinant plasmids serves other plasmid-based RNA interference research. The final plasmids PPARγ-pSUPER-EGFP established the basis for research on the function of PPARγgene.