TY - JOUR
T1 - Antileukemia effects of Notch-mediated inhibition of oncogenic PLK1 in B-cell acute lymphoblastic leukemia
AU - Kannan, Sankaranarayanan
AU - Aitken, Marisa J.L.
AU - Herbrich, Shelley M.
AU - Golfman, Leonard S.
AU - Hall, Mandy G.
AU - Mak, Duncan H.
AU - Burks, Jared K.
AU - Song, Guangchun
AU - Konopleva, Marina
AU - Mullighan, Charles G.
AU - Chandra, Joya
AU - Zweidler-McKay, Patrick A.
N1 - Funding Information:
This work was supported by the NCI (R01CA138816, to P.A. Zweidler-McKay) and by a research grant from Alex's Lemonade Stand (ALSF ID# 4497, to J. Chandra). Additional funding support was provided by Cancer Prevention & Research Institute of Texas (CPRIT: RP150006, to M. Konopleva) and by a Laboratory Incentive Fund from the Division of Pediatrics (to S. Kannan), and additional resources from Richard Gorlick, MD. Thanks to Dr. Michael Roth (Division of Pediatrics) and the Department of Scientific Publications (MD Anderson Cancer Center) for reviewing the manuscript. The authors are grateful to Drs. Michelle Barton, Dean of the University of Texas Graduate School of Biomedical Sciences, and Faye M. Johnson, Associate Professor of Thoracic/Head and Neck Medical Oncology at MD Anderson Cancer Center (Houston, TX), for helpful discussion about the manuscript and providing MDM2 and p53 reagents. The authors also are thankful to the Cellular Imaging Core, Department of Leukemia, for their valuable support in analyzing the CyTOF samples with the support of the NIH/NCI through the MD Anderson Cancer Center Support Grant (CCSG) under award number P30CA016672.
Funding Information:
This work was supported by the NCI (R01CA138816, to P.A. Zweidler-McKay) and by a research grant from Alex's Lemonade Stand (ALSF ID# 4497, to J. Chandra). Additional funding support was provided by Cancer Prevention & Research Institute of Texas (CPRIT: RP150006, to M. Kono-pleva) and by a Laboratory Incentive Fund from the Division of Pediatrics (to S. Kannan), and additional resources from Richard Gorlick, MD. Thanks to Dr. Michael Roth (Division of Pediatrics) and the Department of Scientific Publications (MD Anderson Cancer Center) for reviewing the manuscript. The authors are grateful to Drs. Michelle Barton, Dean of the University of Texas Graduate School of Biomedical Sciences, and Faye M. Johnson, Associate Professor of Thoracic/Head and Neck Medical Oncology at MD Anderson Cancer Center (Houston, TX), for helpful discussion about the manuscript and providing MDM2 and p53 reagents. The authors also are thankful to the Cellular Imaging Core, Department of Leukemia, for their valuable support in analyzing the CyTOF samples with the support of the NIH/NCI through the MD Anderson Cancer Center Support Grant (CCSG) under award number P30CA016672.
Publisher Copyright:
© 2019 American Association for Cancer Research.
PY - 2019
Y1 - 2019
N2 - In B-cell acute lymphoblastic leukemia (B-ALL), activation of Notch signaling leads to cell-cycle arrest and apoptosis. We aimed to harness knowledge acquired by understanding a mechanism of Notch-induced cell death to elucidate a therapeutically viable target in B-ALL. To this end, we identified that Notch activation suppresses Polo-like kinase 1 (PLK1) in a B-ALL–specific manner. We identified that PLK1 is expressed in all subsets of B-ALL and is highest in Philadelphia-like (Ph-like) ALL, a high-risk subtype of disease. We biochemically delineated a mechanism of Notch-induced PLK1 downregulation that elucidated stark regulation of p53 in this setting. Our findings identified a novel posttranslational cascade initiated by Notch in which CHFR was activated via PARP1-mediated PARylation, resulting in ubiquitination and degradation of PLK1. This led to hypophosphorylation of MDM2Ser260, culminating in p53 stabilization and upregulation of BAX. shRNA knockdown or pharmacologic inhibition of PLK1 using BI2536 or BI6727 (volasertib) in B-ALL cell lines and patient samples led to p53 stabilization and cell death. These effects were seen in primary human B-ALL samples in vitro and in patient-derived xenograft models in vivo. These results highlight PLK1 as a viable therapeutic target in B-ALL. Efficacy of clinically relevant PLK1 inhibitors in B-ALL patient-derived xenograft mouse models suggests that use of these agents may be tailored as an additional therapeutic strategy in future clinical studies.
AB - In B-cell acute lymphoblastic leukemia (B-ALL), activation of Notch signaling leads to cell-cycle arrest and apoptosis. We aimed to harness knowledge acquired by understanding a mechanism of Notch-induced cell death to elucidate a therapeutically viable target in B-ALL. To this end, we identified that Notch activation suppresses Polo-like kinase 1 (PLK1) in a B-ALL–specific manner. We identified that PLK1 is expressed in all subsets of B-ALL and is highest in Philadelphia-like (Ph-like) ALL, a high-risk subtype of disease. We biochemically delineated a mechanism of Notch-induced PLK1 downregulation that elucidated stark regulation of p53 in this setting. Our findings identified a novel posttranslational cascade initiated by Notch in which CHFR was activated via PARP1-mediated PARylation, resulting in ubiquitination and degradation of PLK1. This led to hypophosphorylation of MDM2Ser260, culminating in p53 stabilization and upregulation of BAX. shRNA knockdown or pharmacologic inhibition of PLK1 using BI2536 or BI6727 (volasertib) in B-ALL cell lines and patient samples led to p53 stabilization and cell death. These effects were seen in primary human B-ALL samples in vitro and in patient-derived xenograft models in vivo. These results highlight PLK1 as a viable therapeutic target in B-ALL. Efficacy of clinically relevant PLK1 inhibitors in B-ALL patient-derived xenograft mouse models suggests that use of these agents may be tailored as an additional therapeutic strategy in future clinical studies.
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UR - http://www.scopus.com/inward/citedby.url?scp=85071784943&partnerID=8YFLogxK
U2 - 10.1158/1535-7163.MCT-18-0706
DO - 10.1158/1535-7163.MCT-18-0706
M3 - Article
C2 - 31227645
AN - SCOPUS:85071784943
SN - 1535-7163
VL - 18
SP - 1615
EP - 1627
JO - Molecular cancer therapeutics
JF - Molecular cancer therapeutics
IS - 9
ER -