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https://www.readbyqxmd.com/read/28741798/novel-orally-bioavailable-ezh1-2-dual-inhibitors-with-greater-antitumor-efficacy-than-an-ezh2-selective-inhibitor
#1
Daisuke Honma, Osamu Kanno, Jun Watanabe, Junzo Kinoshita, Makoto Hirasawa, Emi Nosaka, Machiko Shiroishi, Takeshi Takizawa, Isao Yasumatsu, Takao Horiuchi, Akira Nakao, Keisuke Suzuki, Tomonori Yamasaki, Katsuyoshi Nakajima, Miho Hayakawa, Takanori Yamazaki, Ajay Singh Yadav, Nobuaki Adachi
Polycomb repressive complex 2 (PRC2) methylates histone H3 lysine 27 and represses gene expression to regulate cell proliferation and differentiation. Enhancer of zeste homolog 2 (EZH2) or its close homolog EZH1 functions as a catalytic subunit of PRC2, so there are two PRC2 complexes containing either EZH2 or EZH1. Tumorigenic functions of EZH2 and its synthetic lethality with some subunits of SWItch/Sucrose Non-Fermentable (SWI/SNF) chromatin remodeling complexes have been observed. However, little is known about the function of EZH1 in tumorigenesis...
July 25, 2017: Cancer Science
https://www.readbyqxmd.com/read/28710059/a-foxo1-induced-oncogenic-network-defines-the-aml1-eto-pre-leukemic-program
#2
Shan Lin, Anetta Ptasinska, Xiaoting Chen, Mahesh Shrestha, Salam A Assi, Paulynn S Chin, Maria R Imperato, Bruce Aronow, Jingsong Zhang, Matthew T Weirauch, Constanze Bonifer, James C Mulloy
Understanding and blocking the self-renewal pathway of pre-leukemia stem cells could prevent acute myeloid leukemia (AML) relapse. In this study we show that increased FOXO1 represents a critical mechanism driving aberrant self-renewal in pre-leukemic cells expressing the t(8;21)-associated oncogene AML1-ETO (AE). Though generally considered as a tumor suppressor, FOXO1 is consistently upregulated in t(8;21) AML. Expression of FOXO1 in human CD34+ cells promotes a pre-leukemic state with enhanced self-renewal and dysregulated differentiation...
July 14, 2017: Blood
https://www.readbyqxmd.com/read/28693140/acute-myeloid-leukemia-with-t-3-21-q26-2-q22-developing-following-low-dose-methotrexate-therapy-for-rheumatoid-arthritis-and-expressing-two-aml1-mds1-evi1-fusion-proteins-a-case-report
#3
Keisuke Tanaka, Gaku Oshikawa, Hiroki Akiyama, Shinya Ishida, Toshikage Nagao, Masahide Yamamoto, Osamu Miura
The t(3;21)(q26.2;q22) translocation is a rare chromosomal abnormality exhibited almost exclusively in therapy-related myelodysplastic syndrome/acute myeloid leukemia (t-MDS/AML) or in the blastic crisis phase of chronic myelogenous leukemia, which results in the fusion of the runt related transcription factor 1 (RUNX1, also called AML1) gene at 21q22 to the myelodysplasia syndrome 1 (MDS1)-ecotropic virus integration site 1 (EVI1) complex locus (MECOM) at 3q26.2, generating various fusion transcripts, including AML1/MDS1/EVI1 (AME)...
July 2017: Oncology Letters
https://www.readbyqxmd.com/read/28680740/haploinsufficient-tumor-suppressor-genes
#4
Kazushi Inoue, Elizabeth A Fry
Haploinsufficiency of tumor suppressor genes (TSGs) indicates that the reduced levels of proteins in cells that lack one allele of the genomic locus results in the inability of the cell to execute normal cellular functions contributing to tumor development. Representative cases of haploinsufficient TSGs are p27(Kip1), p53, DMP1, NF1, and PTEN. Tumor development is significantly accelerated in both mice with homozygous and heterozygous gene deletion, with expression of the wild type allele in the latter. Newly characterized TSGs such as AML1, EGR1, TGFβR1/2, and SMAD4 have also shown haploid insufficiency for tumor suppression...
2017: Advances in Medicine and Biology
https://www.readbyqxmd.com/read/28666258/peptide-microarray-profiling-identifies-phospholipase-c-gamma-1-plc-%C3%AE-1-as-a-potential-target-for-t-8-21-aml
#5
Hasan Mahmud, Frank J G Scherpen, Tiny Meeuwsen de Boer, Harm-Jan Lourens, Caroline Schoenherr, Matthias Eder, Michaela Scherr, Victor Guryev, Eveline S De Bont
The t(8;21) (q22;q22) chromosomal translocation is one of the most frequent genetic alterations in acute myeloid leukemia (AML) which has a need for improved therapeutic strategies. We found PLC-γ1 as one of the highest phosphorylated peptides in t(8;21) AML samples compared to NBM or CN-AML in our previous peptide microarray. PLC-γ1 is known to play a role in cancer progression, however, the impact of PLC-γ1 in AML is currently unknown. Therefore, we aimed to study the functional role of PLC-γ1 by investigating the cellular growth, survival and its underlying mechanism in t(8;21) AML...
June 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/28659642/snornas-contribute-to-myeloid-leukaemogenesis
#6
Mona Khalaj, Christopher Y Park
The mechanism of action of oncogenes in acute myeloid leukaemia is poorly understood. A study now shows that the fusion oncoprotein AML1-ETO regulates leukaemogenesis by increasing the expression of small nucleolar RNAs through post-transcriptional mechanisms, resulting in increased ribosomal RNA methylation, protein translation, and promotion of leukaemic-cell self-renewal and growth.
June 29, 2017: Nature Cell Biology
https://www.readbyqxmd.com/read/28650479/aml1-eto-requires-enhanced-c-d-box-snorna-rnp-formation-to-induce-self-renewal-and-leukaemia
#7
Fengbiao Zhou, Yi Liu, Christian Rohde, Cornelius Pauli, Dennis Gerloff, Marcel Köhn, Danny Misiak, Nicole Bäumer, Chunhong Cui, Stefanie Göllner, Thomas Oellerich, Hubert Serve, Maria-Paz Garcia-Cuellar, Robert Slany, Jaroslaw P Maciejewski, Bartlomiej Przychodzen, Barbara Seliger, Hans-Ulrich Klein, Christoph Bartenhagen, Wolfgang E Berdel, Martin Dugas, Makoto Mark Taketo, Daneyal Farouq, Schraga Schwartz, Aviv Regev, Josée Hébert, Guy Sauvageau, Caroline Pabst, Stefan Hüttelmaier, Carsten Müller-Tidow
Leukaemogenesis requires enhanced self-renewal, which is induced by oncogenes. The underlying molecular mechanisms remain incompletely understood. Here, we identified C/D box snoRNAs and rRNA 2'-O-methylation as critical determinants of leukaemic stem cell activity. Leukaemogenesis by AML1-ETO required expression of the groucho-related amino-terminal enhancer of split (AES). AES functioned by inducing snoRNA/RNP formation via interaction with the RNA helicase DDX21. Similarly, global loss of C/D box snoRNAs with concomitant loss of rRNA 2'-O-methylation resulted in decreased leukaemia self-renewal potential...
July 2017: Nature Cell Biology
https://www.readbyqxmd.com/read/28626363/hoxb4-increases-runx1-expression-to-promote-the-de-novo-formation-of-multipotent-hematopoietic-cells
#8
Nadine Teichweyde, Peter A Horn, Hannes Klump
BACKGROUND: The de novo generation of patient-specific hematopoietic stem and progenitor cells from induced pluripotent stem cells (iPSCs) has become a promising approach for cell replacement therapies in the future. However, efficient differentiation protocols for producing fully functional human hematopoietic stem cells are still missing. In the mouse model, ectopic expression of the human homeotic selector protein HOXB4 has been shown to enforce the development of hematopoietic stem cells (HSCs) in differentiating pluripotent stem cell cultures...
June 2017: Transfusion Medicine and Hemotherapy
https://www.readbyqxmd.com/read/28611288/an-aml1-eto-mir-29b-1-regulatory-circuit-modulates-phenotypic-properties-of-acute-myeloid-leukemia-cells
#9
Sayyed K Zaidi, Andrew W Perez, Elizabeth S White, Jane B Lian, Janet L Stein, Gary S Stein
Acute myeloid leukemia (AML) is characterized by an aggressive clinical course and frequent cytogenetic abnormalities that include specific chromosomal translocations. The 8;21 chromosomal rearrangement disrupts the key hematopoietic RUNX1 transcription factor, and contributes to leukemia through recruitment of co-repressor complexes to RUNX1 target genes, altered subnuclear localization, and deregulation of the myeloid gene regulatory program. However, a role of non-coding microRNAs (miRs) in t(8;21)-mediated leukemogenesis is minimally understood...
June 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/28606225/-clinical-characteristics-and-prognostic-analysis-of-children-and-adolescents-over-10-years-of-age-with-acute-lymphoblastic-leukemia
#10
Jun Wu, Ai-Dong Lu, Le-Ping Zhang
OBJECTIVE: To explore the clinical characteristics and prognosis of children and adolescents over 10 years of age with acute lymphoblastic leukemia (ALL). METHODS: A total of 86 newly diagnosed ALL children and adolescents over 10 years of age (62 cases of B-ALL and 24 cases of T-ALL) were enrolled. Clinical characteristics, therapeutic effect and prognostic factors were retrospectively analyzed. Event-free survival (EFS) and overall survival (OS) rates were estimated by the Kaplan-Meier method...
June 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28598127/-correlations-between-aml1-eto-fusion-gene-and-clinical-features-of-acute-myeloid-leukemia-in-sichuan
#11
Xue-Mei Wang, Yuan-Xin Ye, Lian Yang, Xiao-Jun Lu, Bin-Wu Ying
OBJECTIVES: To determine the correlations between AML1-ETO fusion gene and clinical characteristics of patients with AML,and its association with the prognosis of AML-M2. METHODS: Medical records of 94 AML-M2 cases with positive AML1-ETO fusion gene and 51 AML-M2 cases with negative AML1-ETO gene were retrospective reviewed.Their clinical characteristics,treatment responses and prognostic outcomes were compared. RESULTS: No significant differences in the clinical symptoms,predominantly anemia,fever and hemorrhage,were found between the AML1-ETO fusion gene positive and negative AML-M2 (P>0...
November 2016: Sichuan da Xue Xue Bao. Yi Xue Ban, Journal of Sichuan University. Medical Science Edition
https://www.readbyqxmd.com/read/28567073/quantitative-assessment-of-wilms-tumor-1-expression-by-real-time-quantitative-polymerase-chain-reaction-in-patients-with-acute-myeloblastic-leukemia
#12
Hossein Ayatollahi, Mohammad Hadi Sadeghian, Mahmood Naderi, Amir Hossein Jafarian, Seyyede Fatemeh Shams, Neda Motamedirad, Maryam Sheikhi, Afsane Bahrami, Sepideh Shakeri
BACKGROUND: The Wilms tumor 1 (WT1) gene is originally defined as a tumor suppressor gene and a transcription factor that overexpressed in leukemic cells. It is highly expressed in more than 80% of acute myeloid leukemia (AML) patients, both in bone marrow (BM) and in peripheral blood (PB), and it is used as a powerful and independent marker of minimal residual disease (MRD); we have determined the expression levels of the WT1 by real-time quantitative polymerase chain reaction (RQ-PCR) in PB and BM in 126 newly diagnosed AML patients...
2017: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/28562359/blockage-of-foxp3-transcription-factor-dimerization-and-foxp3-aml1-interaction-inhibits-t-regulatory-cell-activity-sequence-optimization-of-a-peptide-inhibitor
#13
Teresa Lozano, Marta Gorraiz, Aritz Lasarte-Cía, Marta Ruiz, Obdulia Rabal, Julen Oyarzabal, Sandra Hervás-Stubbs, Diana Llopiz, Pablo Sarobe, Jesús Prieto, Noelia Casares, Juan José Lasarte
Although T regulatory cells (Treg) are essential for the prevention of autoimmune diseases, their immunoregulatory function restrains the induction of immune responses against cancer. Thus, development of inhibitors of FOXP3, a key transcription factor for the immunosuppressive activity of Treg, might give new therapeutic opportunities. In a previous work we identified a peptide (named P60) able to enter into the cells, bind to FOXP3, and impair Treg activity in vitro and in vivo. Here we show that P60 binds to the intermediate region of FOXP3 and inhibits its homodimerization as well as its interaction with the transcription factor AML1...
May 13, 2017: Oncotarget
https://www.readbyqxmd.com/read/28539478/a-novel-epigenetic-aml1-eto-thap10-mir-383-mini-circuitry-contributes-to-t-8-21-leukaemogenesis
#14
Yonghui Li, Qiaoyang Ning, Jinlong Shi, Yang Chen, Mengmeng Jiang, Li Gao, Wenrong Huang, Yu Jing, Sai Huang, Anqi Liu, Zhirui Hu, Daihong Liu, Lili Wang, Clara Nervi, Yun Dai, Michael Q Zhang, Li Yu
DNA methylation patterns are frequently deregulated in t(8;21) acute myeloid leukaemia (AML), but little is known of the mechanisms by which specific gene sets become aberrantly methylated. Here, we found that the promoter DNA methylation signature of t(8;21)(+) AML blasts differs from that of t(8;21)(-) AMLs. This study demonstrated that a novel hypermethylated zinc finger-containing protein, THAP10, is a target gene and can be epigenetically suppressed by AML1-ETO at the transcriptional level in t(8;21) AML...
July 2017: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/28516957/asxl2-is-essential-for-haematopoiesis-and-acts-as-a-haploinsufficient-tumour-suppressor-in-leukemia
#15
Jean-Baptiste Micol, Alessandro Pastore, Daichi Inoue, Nicolas Duployez, Eunhee Kim, Stanley Chun-Wei Lee, Benjamin H Durham, Young Rock Chung, Hana Cho, Xiao Jing Zhang, Akihide Yoshimi, Andrei Krivtsov, Richard Koche, Eric Solary, Amit Sinha, Claude Preudhomme, Omar Abdel-Wahab
Additional sex combs-like (ASXL) proteins are mammalian homologues of additional sex combs (Asx), a regulator of trithorax and polycomb function in Drosophila. While there has been great interest in ASXL1 due to its frequent mutation in leukemia, little is known about its paralog ASXL2, which is frequently mutated in acute myeloid leukemia patients bearing the RUNX1-RUNX1T1 (AML1-ETO) fusion. Here we report that ASXL2 is required for normal haematopoiesis with distinct, non-overlapping effects from ASXL1 and acts as a haploinsufficient tumour suppressor...
May 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28454473/methylation-pattern-of-preferentially-expressed-antigen-of-melanoma-in-acute-myeloid-leukemia-and-myelodysplastic-syndromes
#16
Ya-Zhen Qin, Yan-Huan Zhang, Xiao-Ying Qin, Hong-Hu Zhu
Preferentially expressed antigen of melanoma (PRAME), a tumor-associated antigen, is overexpressed in a variety of hematologic malignancies with a great variation in expression. The majority of patients with acute myeloid leukemia (AML) 1-eight-twenty one (ETO)(+) AML and a certain number of myelodysplastic syndromes (MDS) have an abnormally high increase in PRAME expression level. The landscape of PRAME methylation requires evaluation in order to determine the most relevant sites and the exact association of its methylation with expression level and type of disease...
April 2017: Oncology Letters
https://www.readbyqxmd.com/read/28436581/pediatric-acute-lymphoblastic-leukemia-with-t-1-19-tcf3-pbx1-in-taiwan
#17
Hsiu-Ju Yen, Shih-Hsiang Chen, Tsung-Yen Chang, Chao-Ping Yang, Dong-Tsamn Lin, Iou-Jih Hung, Kai-Hsin Lin, Jiann-Shiuh Chen, Chih-Cheng Hsiao, Tai-Tsung Chang, Te-Kao Chang, Ching-Tien Peng, Ming-Tsan Lin, Tang-Her Jaing, Hsi-Che Liu, Shiann-Tarng Jou, Meng-Yao Lu, Chao-Neng Cheng, Jiunn-Ming Sheen, Shyh-Shin Chiou, Giun-Yi Hung, Kang-Hsi Wu, Ting-Chi Yeh, Shih-Chung Wang, Rong-Long Chen, Hsiu-Hao Chang, Yung-Li Yang, Shu-Huey Chen, Shin-Nan Cheng, Yu-Hsiang Chang, Bow-Wen Chen, Yuh-Lin Hsieh, Fang-Liang Huang, Wan-Ling Ho, Jinn-Li Wang, Chia-Yau Chang, Yu-Hua Chao, Pei-Chin Lin, Yu-Chieh Chen, Yu-Mei Liao, Tung-Huei Lin, Lee-Yung Shih, Der-Cherng Liang
BACKGROUND: In childhood acute lymphoblastic leukemia (ALL), t(1;19)(q23;p13.3) with TCF3-PBX1 fusion is one of the most frequent translocations. Historically, it has been associated with poor prognosis. Intensive treatment, however, has improved its outcome. We determined the outcome of children with this genotype treated with contemporary intensive chemotherapy in Taiwan. PROCEDURE: In Taiwan Pediatric Oncology Group 2002 ALL studies, genotypes were determined by cytogenetic analysis and/or reverse transcriptase polymerase chain reaction assay...
October 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/28381396/caspase-3-controls-aml1-eto-driven-leukemogenesis-via-autophagy-modulation-in-a-ulk1-dependent-manner
#18
Na Man, Yurong Tan, Xiao-Jian Sun, Fan Liu, Guoyan Cheng, Sarah M Greenblatt, Camilo Martinez, Daniel L Karl, Koji Ando, Ming Sun, Dan Hou, Bingyi Chen, Mingjiang Xu, Feng-Chun Yang, Zhu Chen, Saijuan Chen, Stephen D Nimer, Lan Wang
AML1-ETO (AE), a fusion oncoprotein generated by t(8;21), can trigger acute myeloid leukemia (AML) in collaboration with mutations including c-Kit, ASXL1/2, FLT3, N-RAS, and K-RAS. Caspase-3, a key executor among its family, plays multiple roles in cellular processes, including hematopoietic development and leukemia progression. Caspase-3 was revealed to directly cleave AE in vitro, suggesting that AE may accumulate in a Caspase-3-compromised background and thereby accelerate leukemogenesis. Therefore, we developed a Caspase-3 knockout genetic mouse model of AML and found that loss of Caspase-3 actually delayed AML1-ETO9a (AE9a)-driven leukemogenesis, indicating that Caspase-3 may play distinct roles in the initiation and/or progression of AML...
May 18, 2017: Blood
https://www.readbyqxmd.com/read/28360416/heterodimerization-of-aml1-eto-with-cbf%C3%AE-is-required-for-leukemogenesis-but-not-for-myeloproliferation
#19
V Thiel, B D Giaimo, P Schwarz, K Soller, V Vas, M Bartkuhn, T J Blätte, K Döhner, L Bullinger, T Borggrefe, H Geiger, F Oswald
The AML1/Runx1 transcription factor and its heterodimerization partner CBFβ are essential regulators of myeloid differentiation. The chromosomal translocation t(8;21), fusing the DNA binding domain of AML1 to the corepressor eight-twenty-one (ETO), is frequently associated with acute myeloid leukemia (AML) and generates the AML1/ETO (AE) fusion protein. AE represses target genes usually activated by AML1 and also affects the endogenous repressive function of ETO at Notch target genes. In order to analyze the contribution of CBFβ in AE-mediated leukemogenesis and deregulation of Notch target genes, we introduced two point mutations in a leukemia initiating version of AE in mice, called AE9a, that disrupt the AML1/CBFβ interaction (AE9aNT)...
March 31, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28349830/aberrant-aml1-gene-expression-in-the-diagnosis-of-childhood-leukemias-not-characterized-by-aml1-involved-cytogenetic-abnormalities
#20
Maria Adamaki, Spiros Vlahopoulos, George I Lambrou, Athanasios G Papavassiliou, Maria Moschovi
The AML1 ( acute myeloid leukemia 1) gene, a necessary prerequisite of embryonic hematopoiesis and a critical regulator of normal hematopoietic development, is one of the most frequently mutated genes in human leukemia, involving over 50 chromosome translocations and over 20 partner genes. In the few existing studies investigating AML1 gene expression in childhood leukemias, aberrant upregulation seems to specifically associate with AML1 translocations and amplifications. The aim of this study was to determine whether overexpression also extends to other leukemic subtypes than the ones karyotypically involving AML1...
March 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
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