Abstract：
:Developing cardiac myocytes divide a limited number of times before they stop and terminally differentiate, but the mechanism that stops their division is unknown. To help study the stopping mechanism, we defined conditions under which embryonic rat cardiac myocytes cultured in serum-free medium proliferate and exit the cell cycle on a schedule that closely resembles that seen in vivo. The culture medium contains FGF-1 and FGF-2, which stimulate cell proliferation, and thyroid hormone, which seems to be necessary for stable cell-cycle exit. Time-lapse video recording shows that the cells within a clone tend to divide a similar number of times before they stop, whereas cells in different clones divide a variable number of times before they stop. Cells cultured at 33 degrees C divide more slowly but stop dividing at around the same time as cells cultured at 37 degrees C, having undergone fewer divisions. Together, these findings suggest that an intrinsic timer helps control when cardiac myocytes withdraw from the cell cycle and that the timer does not operate by simply counting cell divisions. We provide evidence that the cyclin-dependent kinase inhibitors p18 and p27 may be part of the timer and that thyroid hormone may help developing cardiac myocytes stably withdraw from the cell cycle.
journal_name
Dev Bioljournal_title
Developmental biologyauthors
Burton PB,Raff MC,Kerr P,Yacoub MH,Barton PJdoi
10.1006/dbio.1999.9524subject
Has Abstractpub_date
1999-12-15 00:00:00pages
659-70issue
2eissn
0012-1606issn
1095-564Xpii
S0012-1606(99)99524-6journal_volume
216pub_type
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更新日期：2008-10-01 00:00:00
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