Activation and function of cyclin T-Cdk9 (positive transcription elongation factor-b) in cardiac muscle-cell hypertrophy

Motoaki Sano, Maha Abdellatif, Hidemasa Oh, Min Xie, Luigi Bagella, Antonio Giordano, Lloyd H. Michael, Francesco J. DeMayo, Michael D. Schneider

Research output: Contribution to journalArticle

177 Citations (Scopus)

Abstract

Hypertrophic growth is a risk factor for mortality in heart diseases. Mechanisms are lacking for this global increase in RNA and protein per cell, which underlies hypertrophy. Hypertrophic signals cause phosphorylation of the RNA polymerase II C-terminal domain, required for transcript elongation. RNA polymerase II kinases include cyclin-dependent kinases-7 (Cdk7) and Cdk9, components of two basal transcription factors. We report activation of Cdk7 and -9 in hypertrophy triggered by signaling proteins (Gαq, calcineurin) or chronic mechanical stress. Only Cdk9 was activated by acute load or, in culture, by endothelin. A preferential role for Cdk9 was shown in RNA polymerase II phosphorylation and growth induced by endothelin, using pharmacological and dominant-negative inhibitors. All four hypertrophic signals dissociated 7SK small nuclear RNA, an endogenous inhibitor, from cyclin T-Cdk9. Cdk9 was limiting for cardiac growth, shown by suppressing its inhibitor (7SK) in culture and preventing downregulation of its activator (cyclin T1) in mouse myocardium.

Original languageEnglish
Pages (from-to)1310-1317
Number of pages8
JournalNature Medicine
Volume8
Issue number11
DOIs
Publication statusPublished - 2002 Nov 1
Externally publishedYes

Fingerprint

Cyclin T
Peptide Elongation Factors
RNA Polymerase II
Transcription
Cardiac Myocytes
Hypertrophy
Muscle
Phosphorylation
Transcription Factors
Cyclin-Dependent Kinases
Chemical activation
Endothelins
Cyclin-Dependent Kinase 9
Growth
Gq-G11 GTP-Binding Protein alpha Subunits
RNA Polymerase III
Small Nuclear RNA
Mechanical Stress
Calcineurin
Elongation

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Activation and function of cyclin T-Cdk9 (positive transcription elongation factor-b) in cardiac muscle-cell hypertrophy. / Sano, Motoaki; Abdellatif, Maha; Oh, Hidemasa; Xie, Min; Bagella, Luigi; Giordano, Antonio; Michael, Lloyd H.; DeMayo, Francesco J.; Schneider, Michael D.

In: Nature Medicine, Vol. 8, No. 11, 01.11.2002, p. 1310-1317.

Research output: Contribution to journalArticle

Sano, M, Abdellatif, M, Oh, H, Xie, M, Bagella, L, Giordano, A, Michael, LH, DeMayo, FJ & Schneider, MD 2002, 'Activation and function of cyclin T-Cdk9 (positive transcription elongation factor-b) in cardiac muscle-cell hypertrophy', Nature Medicine, vol. 8, no. 11, pp. 1310-1317. https://doi.org/10.1038/nm778
Sano, Motoaki ; Abdellatif, Maha ; Oh, Hidemasa ; Xie, Min ; Bagella, Luigi ; Giordano, Antonio ; Michael, Lloyd H. ; DeMayo, Francesco J. ; Schneider, Michael D. / Activation and function of cyclin T-Cdk9 (positive transcription elongation factor-b) in cardiac muscle-cell hypertrophy. In: Nature Medicine. 2002 ; Vol. 8, No. 11. pp. 1310-1317.
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