Back to Search
Start Over
E2F4 is required for cardiomyocyte proliferation
- Source :
- Cardiovascular Research. 86:92-102
- Publication Year :
- 2009
- Publisher :
- Oxford University Press (OUP), 2009.
-
Abstract
- Aims Although the fundamental role of the E2F transcription factor family in cell proliferation is well established, the specific function of E2F4 is unclear. On the basis of findings from cell culture experiments, E2F4 is generally considered as an inhibitor of cell proliferation. Accumulating evidence suggests, however, that E2F4 acts as an activator of cell proliferation in certain contexts. Here, we have investigated the role of E2F4 during heart development and in proliferating cardiomyocytes. Methods and results Nuclear E2F4 expression in cardiomyocytes declined during mouse heart development, which correlates with the loss of proliferative capacity of cardiomyocytes. Re-induction of proliferation in postnatal cardiomyocytes increased nuclear E2F4 expression. E2F4 accumulated in the nucleus at the end of the S phase, remained nuclear during mitosis, and disappeared at the end of cytokinesis. siRNA-mediated inhibition of E2F4 in proliferating postnatal cardiomyocytes resulted in a significant reduction in mitosis, but not in DNA synthesis. Co-staining of E2F4 and Crest revealed that E2F4 co-localizes with kinetochores. Moreover, chromatin immunoprecipitation showed that E2F4 binds to centromeric α-satellite DNA during mitosis. Conclusion Our data indicate that E2F4 is required for cardiomyocyte proliferation and suggest a function for E2F4 in mitosis.
- Subjects :
- Physiology
Green Fluorescent Proteins
Mitosis
Mice, Transgenic
E2F4 Transcription Factor
Biology
Rats, Sprague-Dawley
Mice
E2F2 Transcription Factor
Pregnancy
Physiology (medical)
medicine
Animals
Humans
Myocyte
Myocytes, Cardiac
Kinetochores
E2F4
Cells, Cultured
Cell Nucleus
Cell growth
Cell Cycle
Gene Expression Regulation, Developmental
Heart
Cell cycle
Rats
Mice, Inbred C57BL
Cell nucleus
medicine.anatomical_structure
Lac Operon
Cancer research
Female
Cardiology and Cardiovascular Medicine
Chromatin immunoprecipitation
Cell Division
Cytokinesis
Subjects
Details
- ISSN :
- 17553245 and 00086363
- Volume :
- 86
- Database :
- OpenAIRE
- Journal :
- Cardiovascular Research
- Accession number :
- edsair.doi.dedup.....1b666c38f002b81fa1ed9ad016c25dd3