Abstract
Previous studies suggest that the CCAAT/enhancer-binding protein (C/EBP) functions in the coordinate expression of adipocyte genes during differentiation of 3T3-L1 preadipocytes. We sought to block expression of C/EBP selectively using a bovine papilloma virus (BPV) vector to direct transcription of a approximately 0.4-kb segment of C/EBP cDNA (in antisense orientation) containing translated sequence 5' to that encoding the basic and leucine zipper regions of the protein. Vector-directed expression of antisense C/EBP RNA in 3T3-L1 preadipocytes inhibited expression of C/EBP mRNA and protein, as well as several adipose-specific mRNAs, and also prevented cytoplasmic triglyceride accumulation. Rescue of the "adipocyte phenotype" was accomplished by transfection of cells expressing antisense RNA with a modified BPV vector that directs transcription of the complementary sense C/EBP RNA.
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