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Blood, 1 January 2005, Vol. 105, No. 1, pp. 292-300.
Prepublished online as a Blood First Edition Paper on August 26, 2004; DOI 10.1182/blood-2004-03-1185.
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NEOPLASIA
Physical and functional link of the leukemia-associated factors AML1 and PML
Lan Anh Nguyen,
Pier Paolo Pandolfi,
Yukiko Aikawa,
Yusuke Tagata,
Misao Ohki, and
Issay Kitabayashi
From the Molecular Oncology Division, Cancer Genomics Project, National Cancer Center Research Institute, 5-1-1 Tsukiji, Chuo-ku, Tokyo, Japan; and the Cancer Biology/Genetics Program and Department of Pathology, Sloan-Kettering Institute Memorial Sloan-Kethering Cancer Center, New York, NY
The AML1-CBF transcription factor complex is the most frequent target of specific chromosome translocations in acute myeloid leukemia (AML). The promyelocytic leukemia (PML) gene is also frequently involved in AML-associated translocation. Here we report that a specific isoform PML I forms a complex with AML1. PML I was able to recruit AML1 and coactivator p300 in PML nuclear bodies and enhance the AML1-mediated transcription in the presence of p300. A specific C-terminal region of PML I and a C-terminal region of AML1 were found to be required for both their association and colocalization in the nuclear bodies. Overexpression of PML I stimulates myeloid cells to differentiate. These results suggest that PML I could act as a mediator for AML1 and its coactivator p300/CBP to assemble into functional complexes and, consequently, activate AML1-dependent transcription and myeloid cell differentiation. (Blood. 2005;105:292-300)

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