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jumonji downregulates cardiac cell proliferation by repressing cyclin D1 expression
Masashi Toyoda1, Haruki Shirato, Kuniko Nakajima
1Mitsubishi Kagaku Institute of Life Sciences (MITILS), 11 Minamiooya, Machida, 194-8511, Tokyo, .
Developmental Cell
|July 11, 2003
Summary
Jumonin (jmj) protein negatively regulates cardiac cell proliferation by repressing cyclin D1 expression. Loss of jmj leads to increased cyclin D1 and hyperproliferation, impacting cardiac development.
Area of Science:
- Developmental Biology
- Molecular Biology
- Cardiovascular Research
Background:
- Spatiotemporal control of cell proliferation is crucial for tissue development.
- Molecular mechanisms, particularly signaling pathways governing the cell cycle, are not fully understood.
Purpose of the Study:
- To investigate the role of jumonji (jmj) in regulating cardiac myocyte proliferation.
- To elucidate the molecular mechanisms by which jmj influences the cell cycle.
Main Methods:
- Analysis of jmj expression patterns in relation to cardiac myocyte proliferation.
- Investigating the effects of jmj deficiency and overexpression on cyclin D1 expression and cell proliferation.
- In vivo studies of Jmj protein binding to the cyclin D1 promoter.
Main Results:
- A negative correlation was observed between jmj expression patterns and cardiac myocyte proliferation.
- jmj-deficient embryos exhibited enhanced cyclin D1 expression and cardiac myocyte proliferation.
- jmj overexpression repressed cyclin D1 expression, and Jmj protein directly inhibited its transcription.
- Absence of cyclin D1 rescued the hyperproliferation phenotype in jmj mutant embryos.
Conclusions:
- Jumonin (jmj) acts as a negative regulator of cardiac myocyte proliferation.
- Jmj controls cardiac development by repressing cyclin D1 expression and its transcriptional activity.