Related Experiment Videos
Antisense CCAAT/enhancer-binding protein RNA suppresses coordinate gene expression and triglyceride accumulation
1Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.
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.
Insights
Blocking CCAAT/enhancer-binding protein (C/EBP) expression with antisense RNA in 3T3-L1 cells inhibited adipocyte gene expression and fat accumulation. This confirmed C/EBP
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- CCAAT/enhancer-binding protein (C/EBP) is implicated in the coordinated expression of adipocyte genes during 3T3-L1 preadipocyte differentiation.
- Understanding C/EBP's role is crucial for elucidating adipogenesis mechanisms.
Purpose of the Study:
- To selectively block C/EBP expression in 3T3-L1 preadipocytes.
- To investigate the functional consequences of C/EBP inhibition on adipocyte differentiation.
Main Methods:
- Utilized a bovine papilloma virus (BPV) vector for antisense C/EBP RNA expression.
- Transfected 3T3-L1 preadipocytes with antisense C/EBP cDNA in the antisense orientation.
- Assessed C/EBP mRNA and protein levels, adipose-specific mRNAs, and cytoplasmic triglyceride accumulation.
Main Results:
- Antisense C/EBP RNA expression successfully inhibited C/EBP mRNA and protein levels.
- Adipose-specific gene expression and cytoplasmic triglyceride accumulation were significantly reduced.
- Rescue experiments using sense C/EBP RNA restored the adipocyte phenotype.
Conclusions:
- C/EBP plays a critical role in regulating adipocyte gene expression and adipogenesis.
- Selective inhibition of C/EBP is a viable strategy to study its function in differentiation.
- The findings provide insights into the molecular mechanisms governing adipocyte differentiation.