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DNA binding by C/EBP proteins correlates with hepatocyte proliferation
H E Soriano1, T A Bilyeu, T S Juan
1Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA.
In Vitro Cellular & Developmental Biology. Animal
|October 1, 1995
Summary
CCAAT-enhancer-binding proteins (C/EBP) alpha and beta DNA binding activity was studied in primary mouse hepatocytes. C/EBP beta binding increased with reduced proliferation, while C/EBP alpha binding remained low.
Area of Science:
- Hepatology
- Molecular Biology
- Cellular Biology
Background:
- Leucine zipper transcription factors CCAAT-enhancer-binding proteins (C/EBP) alpha and beta are involved in liver regeneration.
- Their expression and DNA binding vary with cell growth and proliferation.
Purpose of the Study:
- To investigate the relationship between C/EBP protein DNA-binding activity and hepatocyte proliferation in vitro.
- To analyze the expression patterns of C/EBP alpha, beta, and delta during primary mouse hepatocyte culture.
Main Methods:
- Primary mouse hepatocytes were cultured in a defined medium.
- DNA-binding activity of C/EBP proteins was assessed using gel retardation assays (bZIP oligomer).
- Hepatocytes were treated with various growth factors (EGF, FGF, TGF-α, HGF, TGF-β) to observe effects on C/EBP binding.
Main Results:
- C/EBP alpha was the major binding protein in freshly dissociated cells but showed reduced binding in culture.
- C/EBP beta binding activity increased after 48 hours of culture and remained elevated.
- TGF-β treatment, which inhibits proliferation, enhanced C/EBP beta binding activity.
- Other growth factors did not significantly alter C/EBP binding patterns.
Conclusions:
- A negative correlation exists between C/EBP transactivator protein DNA binding and primary mouse hepatocyte proliferation in vitro.
- C/EBP beta appears to play a significant role in regulating hepatocyte proliferation, particularly under conditions of growth inhibition.