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Müller, F.U. et al.

Müller, Loser, Kleideiter, Neumann, von Wallbrunn, Dobner, Scheld, Bantel, Engels, Schulze-Osthoff, Schmitz,

Transcription factor AP-2alpha triggers apoptosis in cardiac myocytes.

Idiopathic-dilated cardiomyopathy (IDC) is a common primary myocardial disease of unknown etiology associated with apoptosis, cardiac dilatation, progressive heart failure and increased mortality. An elevation of the transcription factor activator protein 2alpha (AP-2alpha) is involved in vertebrate embryonic development and oncogenesis. Here, we show that AP-2alpha protein is expressed in the human heart and increased in human failing myocardium with IDC. Adenovirus-mediated overexpression of human AP-2alpha triggered apoptosis and increased mRNA levels of Bcl-2 family members Bax and Bcl-x in rat cardiomyocytes. Immunohistological analysis of human myocardium revealed an increased percentage of AP-2alpha-positive nuclei in IDC and, interestingly, a colocalization of AP-2alpha-positive but not -negative cells with a caspase-cleaved fragment of poly(ADP-ribose)polymerase. We suggest AP-2alpha as a novel cardiac regulator implicated in the activation of apoptosis in IDC.[1]

References

Transcription factor AP-2alpha triggers apoptosis in cardiac myocytes. Müller, F.U., Loser, K., Kleideiter, U., Neumann, J., von Wallbrunn, C., Dobner, T., Scheld, H.H., Bantel, H., Engels, I.H., Schulze-Osthoff, K., Schmitz, W. Cell Death Differ. (2004) [Pubmed]

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