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  • 1
    Publication Date: 2015-02-14
    Description: Acute myeloid leukemia (AML) is the most common form of adult leukemia. The transcription factor fusion CBFbeta-SMMHC (core binding factor beta and the smooth-muscle myosin heavy chain), expressed in AML with the chromosome inversion inv(16)(p13q22), outcompetes wild-type CBFbeta for binding to the transcription factor RUNX1, deregulates RUNX1 activity in hematopoiesis, and induces AML. Current inv(16) AML treatment with nonselective cytotoxic chemotherapy results in a good initial response but limited long-term survival. Here, we report the development of a protein-protein interaction inhibitor, AI-10-49, that selectively binds to CBFbeta-SMMHC and disrupts its binding to RUNX1. AI-10-49 restores RUNX1 transcriptional activity, displays favorable pharmacokinetics, and delays leukemia progression in mice. Treatment of primary inv(16) AML patient blasts with AI-10-49 triggers selective cell death. These data suggest that direct inhibition of the oncogenic CBFbeta-SMMHC fusion protein may be an effective therapeutic approach for inv(16) AML, and they provide support for transcription factor targeted therapy in other cancers.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4423805/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4423805/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Illendula, Anuradha -- Pulikkan, John A -- Zong, Hongliang -- Grembecka, Jolanta -- Xue, Liting -- Sen, Siddhartha -- Zhou, Yunpeng -- Boulton, Adam -- Kuntimaddi, Aravinda -- Gao, Yan -- Rajewski, Roger A -- Guzman, Monica L -- Castilla, Lucio H -- Bushweller, John H -- 1 DP2 OD007399-01/OD/NIH HHS/ -- DP2 OD007399/OD/NIH HHS/ -- R01 AI039536/AI/NIAID NIH HHS/ -- R01 CA096983/CA/NCI NIH HHS/ -- R01 CA140398/CA/NCI NIH HHS/ -- T32 GM080186/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2015 Feb 13;347(6223):779-84. doi: 10.1126/science.aaa0314.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22908, USA. ; Program in Gene Function and Expression, University of Massachusetts Medical School, Worcester, MA 01605, USA. ; Department of Medicine, Weill Medical College of Cornell University, New York, NY 10065, USA. ; Department of Pathology, University of Michigan, Ann Arbor, MI 48109, USA. ; Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, KS 66045, USA. ; Program in Gene Function and Expression, University of Massachusetts Medical School, Worcester, MA 01605, USA. jhb4v@virginia.edu Lucio.Castilla@umassmed.edu. ; Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22908, USA. jhb4v@virginia.edu Lucio.Castilla@umassmed.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25678665" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antineoplastic Agents/chemistry/*therapeutic use ; Benzimidazoles/chemistry/*therapeutic use ; Cell Line, Tumor ; Core Binding Factor Alpha 2 Subunit/antagonists & inhibitors/metabolism ; Female ; Humans ; Leukemia, Myeloid, Acute/*drug therapy ; Mice ; Mice, Inbred C57BL ; Oncogene Proteins, Fusion/*antagonists & inhibitors/metabolism ; Protein Interaction Maps ; Small Molecule Libraries/chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2021-10-14
    Description: The blood system serves as a key model for cell differentiation and cancer. It is orchestrated by precise spatiotemporal expression of crucial transcription factors. One of the key master regulators in the hematopoietic systems is PU.1. Reduced levels of PU.1 are characteristic for human acute myeloid leukemia (AML) and are known to induce AML in mouse models. Here, we show that transcriptional downregulation of PU.1 is an active process involving an alternative promoter in intron 3 that is induced by RUNX transcription factors driving noncoding antisense transcription. Core-binding factor (CBF) fusions RUNX1-ETO and CBFβ-MYH11 in t(8;21) and inv(16) AML, respectively, activate the PU.1 antisense promoter that results in a shift from sense toward antisense transcription and myeloid differentiation blockade. In patients with CBF-AML, we found that an elevated antisense/sense transcript and promoter accessibility ratio represents a hallmark compared with normal karyotype AML or healthy CD34+ cells. Competitive interaction of an enhancer with the proximal or the antisense promoter forms a binary on/off switch for either myeloid or T-cell development. Leukemic CBF fusions thus use a physiological mechanism used by T cells to decrease sense transcription. Our study is the first example of a sense/antisense promoter competition as a crucial functional switch for gene expression perturbation by oncogenes. Hence, this disease mechanism reveals a previously unknown Achilles heel for future precise therapeutic targeting of oncogene-induced chromatin remodeling.
    Print ISSN: 0006-4971
    Electronic ISSN: 1528-0020
    Topics: Biology , Medicine
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