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Cyclins and cyclin dependent kinases during cardiac development

M J Kang1, J S Kim, S W Chae

  • 1Department of Physiology, Chonbuk National University Medical School, Chonju, Korea.

Molecules and Cells
|June 30, 1997
PubMed
Summary

Cardiomyocyte cell cycle regulation is complex. Key cell cycle proteins, cyclins and cyclin-dependent kinases (CDKs), are highly expressed during embryonic development and decrease significantly after birth, suggesting their role in cardiac cell cycle withdrawal.

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Area of Science:

  • Cardiovascular Biology
  • Cell Cycle Regulation
  • Molecular Cardiology

Background:

  • The molecular mechanisms governing cardiomyocyte cell cycle progression and terminal differentiation are not fully understood.
  • Understanding these mechanisms is crucial for addressing cardiac development and potential regenerative therapies.

Purpose of the Study:

  • To investigate the expression patterns of cyclins and cyclin-dependent kinases (CDKs) during cardiac development.
  • To identify specific cyclins and CDKs critical for cardiomyocyte proliferation and cell cycle exit.

Main Methods:

  • Examined the expression of various cyclins (A, B, D1, D2, D3, E) and CDKs (cdc2, CDK2, CDK4) at different developmental stages of the heart.
  • Utilized reverse transcriptase-polymerase chain reaction (RT-PCR) to determine the cellular origin of specific cyclins.

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  • Assessed the expression of proliferating cell nuclear antigen (PCNA) as a marker of cell proliferation.

    • Main Results:

    • All examined cyclins and CDKs were highly expressed during embryonic cardiac development, decreasing postnatally at varying rates.
    • Mitotic cyclins (A and B) were detected in embryonic and neonatal hearts but absent in adult hearts.
    • G1/S phase cyclins (D1, D3, E) showed protein expression in young hearts, with differential decline. CDK and PCNA expression patterns mirrored each other, decreasing significantly in adult hearts.
    • RT-PCR confirmed that cyclins B and D3 are expressed in both cardiomyocytes and non-cardiomyocytes.

    Conclusions:

    • Both cyclins and CDKs are integral to the cardiac cell cycle during development.
    • The rapid reduction in mitotic cyclins post-birth likely contributes to the withdrawal of cardiomyocytes from the cell cycle.
    • These findings provide insights into the developmental regulation of cardiac cell proliferation and differentiation.