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Acute Leukemias

Elevated PIN1 expression by C/EBPα-p30 blocks C/EBPα-induced granulocytic differentiation through c-Jun in AML

Abstract

The transcription factor CCAAT enhancer-binding protein α (C/EBPα) has an important role in granulopoiesis. The tumor suppressor function of C/EBPα is shown by the findings that loss of expression or function of C/EBPα in leukemic blasts contributes to a block in myeloid cell differentiation and to leukemia. C/EBPα mutations are found in around 9% of acute myeloid leukemia (AML) patients. The mechanism by which the mutant form of C/EBPα (C/EBPα-p30) exerts a differentiation block is not well understood. By using a proteomic screen, we have recently reported PIN1 as a target of C/EBPα-p30 in AML. In the present study, we show that C/EBPα-p30 induces PIN1 expression. We observed elevated PIN1 expression in leukemic patient samples. Induction of C/EBPα-p30 results in recruitment of E2F1 in the PIN1 promoter. We show that the inhibition of PIN1 leads to myeloid differentiation in primary AML blasts with C/EBPα mutations. Overexpression of PIN1 in myeloid cells leads to block of granulocyte differentiation. We also show that PIN1 increases the stability of the c-Jun protein by inhibiting c-Jun ubiquitination, and c-Jun blocks granulocyte differentiation mediated by C/EBPα. Our data suggest that the inhibition of PIN1 could be a potential strategy of treating AML patients with C/EBPα mutation.

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Acknowledgements

We thank Dr Alan D. Friedman for BRM2 cell line, Dr Giannino Del Sal, Dr Lu KP and Dr Bruno Calabretta for DNA constructs and Dr George Bornkamm for valuable discussions. This work was supported by grants from Deutsche Jos Leukämie-Stiftung (F06/03) to J.A.P; the National Institute of Health (R01 HL56745) to D.G.T and Deutsche Jos Leukämie-Stiftung, DFG and Krebshilfe to G.B.

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Correspondence to G Behre.

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Pulikkan, J., Dengler, V., Peer Zada, A. et al. Elevated PIN1 expression by C/EBPα-p30 blocks C/EBPα-induced granulocytic differentiation through c-Jun in AML. Leukemia 24, 914–923 (2010). https://doi.org/10.1038/leu.2010.37

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