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Maintenance of leukemia-initiating cells is regulated by the CDK inhibitor Inca1. PLoS One 2014; 9:e115578. [PMID: 25525809 PMCID: PMC4272264 DOI: 10.1371/journal.pone.0115578] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 12/01/2014] [Indexed: 11/19/2022] Open
Abstract
Functional differences between healthy progenitor and cancer initiating cells may provide unique opportunities for targeted therapy approaches. Hematopoietic stem cells are tightly controlled by a network of CDK inhibitors that govern proliferation and prevent stem cell exhaustion. Loss of Inca1 led to an increased number of short-term hematopoietic stem cells in older mice, but Inca1 seems largely dispensable for normal hematopoiesis. On the other hand, Inca1-deficiency enhanced cell cycling upon cytotoxic stress and accelerated bone marrow exhaustion. Moreover, AML1-ETO9a-induced proliferation was not sustained in Inca1-deficient cells in vivo. As a consequence, leukemia induction and leukemia maintenance were severely impaired in Inca1−/− bone marrow cells. The re-initiation of leukemia was also significantly inhibited in absence of Inca1−/− in MLL—AF9- and c-myc/BCL2-positive leukemia mouse models. These findings indicate distinct functional properties of Inca1 in normal hematopoietic cells compared to leukemia initiating cells. Such functional differences might be used to design specific therapy approaches in leukemia.
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Inukai T, Zhang X, Kameyama T, Suzuki Y, Yoshikawa K, Kuroda I, Nemoto A, Akahane K, Sato H, Goi K, Nakamoto K, Hamada J, Tada M, Moriuchi T, Sugita K. A specific linkage between the incidence of TP53 mutations and type of chromosomal translocations in B-precursor acute lymphoblastic leukemia cell lines. Am J Hematol 2010; 85:535-7. [PMID: 20575032 PMCID: PMC7159455 DOI: 10.1002/ajh.21738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Takeshi Inukai
- Department of Pediatrics, School of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Xiuru Zhang
- Division of Cancer‐Related Genes, Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Takeshi Kameyama
- Division of Cancer‐Related Genes, Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Yukiko Suzuki
- Division of Cancer‐Related Genes, Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Kazuhito Yoshikawa
- Division of Cancer‐Related Genes, Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Itaru Kuroda
- Department of Pediatrics, School of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Atsushi Nemoto
- Department of Pediatrics, School of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Koshi Akahane
- Department of Pediatrics, School of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Hiroki Sato
- Department of Pediatrics, School of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Kumiko Goi
- Department of Pediatrics, School of Medicine, University of Yamanashi, Yamanashi, Japan
| | - Kazunori Nakamoto
- Bioinformatics Support Section, Center for Life Science Research, University of Yamanashi, Yamanashi, Japan
| | - Jun‐ichi Hamada
- Division of Cancer‐Related Genes, Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Mitsuhiro Tada
- Division of Cancer‐Related Genes, Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Tetsuya Moriuchi
- Division of Cancer‐Related Genes, Institute for Genetic Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Kanji Sugita
- Department of Pediatrics, School of Medicine, University of Yamanashi, Yamanashi, Japan
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