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Huang S, Hou D, Zhang L, Pei C, Liang J, Li J, Yang G, Yu D. LncRNA MALAT1 Promoted Neuronal Necroptosis in Cerebral Ischemia-reperfusion Mice by Stabilizing HSP90. Neurochem Res 2023; 48:3457-3471. [PMID: 37470906 DOI: 10.1007/s11064-023-03991-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 07/03/2023] [Accepted: 07/09/2023] [Indexed: 07/21/2023]
Abstract
The objective of this research was to investigate the role of lncRNA MALAT1 and HSP90 in the regulation of neuronal necroptosis in mice with cerebral ischemia-reperfusion (CIR). We used male C57BL/6J mice to establish a middle cerebral artery occlusion (MCAO) model and conducted in vitro experiments using the HT-22 mouse hippocampal neuron cell line. The cellular localization of NeuN and MLKL, as well as the expression levels of neuronal necroptosis factors, MALAT1, and HSP90 were analyzed. Cell viability and necroptosis were assessed, and we also investigated the relationship between MALAT1 and HSP90. The results showed that MALAT1 expression increased after MCAO and oxygen-glucose deprivation/re-oxygenation (OGD/R) treatment in both cerebral tissues and cells compared with the control group. The levels of neuronal necroptosis factors and the co-localization of NeuN and MLKL were also increased in MCAO mice compared with the Sham group. MALAT1 was found to interact with HSP90, and inhibition of HSP90 expression led to decreased phosphorylation levels of neuronal necroptosis factors. Inhibition of MALAT1 expression resulted in decreased co-localization levels of NeuN and MLKL, decreased phosphorylation levels of neuronal necroptosis factors, and reduced necroptosis rate in cerebral tissues. Furthermore, inhibiting MALAT1 expression also led to a shorter half-life of HSP90, increased ubiquitination level, and decreased phosphorylation levels of neuronal necroptosis factors in cells. In conclusion, this study demonstrated that lncRNA MALAT1 promotes neuronal necroptosis in CIR mice by stabilizing HSP90.
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Affiliation(s)
- Shan Huang
- Department of Neurology, Haikou Affiliated Hospital of Central South University Xiangya School of Medicine, No. 43 Renmin Avenue, Haikou, 570208, Hainan, China
| | - Dan Hou
- Department of Neurology, Haikou Affiliated Hospital of Central South University Xiangya School of Medicine, No. 43 Renmin Avenue, Haikou, 570208, Hainan, China
| | - Lei Zhang
- Department of Neurology, Haikou Affiliated Hospital of Central South University Xiangya School of Medicine, No. 43 Renmin Avenue, Haikou, 570208, Hainan, China
| | - Chaoying Pei
- Department of Neurology, Haikou Affiliated Hospital of Central South University Xiangya School of Medicine, No. 43 Renmin Avenue, Haikou, 570208, Hainan, China
| | - Ji Liang
- Department of Neurology, The First People's Hospital of Changde, Changde, 415000, Hunan, China
| | - Junqi Li
- Department of Neurology, Haikou Affiliated Hospital of Central South University Xiangya School of Medicine, No. 43 Renmin Avenue, Haikou, 570208, Hainan, China
| | - Guoshuai Yang
- Department of Neurology, Haikou Affiliated Hospital of Central South University Xiangya School of Medicine, No. 43 Renmin Avenue, Haikou, 570208, Hainan, China.
| | - Dan Yu
- Department of Neurology, Haikou Affiliated Hospital of Central South University Xiangya School of Medicine, No. 43 Renmin Avenue, Haikou, 570208, Hainan, China.
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Liu X, Sun W, Wang L, Zhou B, Li P. Melatonin promotes differentiation and apoptosis of AML1-ETO-positive cells. Bull Cancer 2023; 110:342-351. [PMID: 36863921 DOI: 10.1016/j.bulcan.2023.01.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 01/10/2023] [Accepted: 01/14/2023] [Indexed: 03/04/2023]
Abstract
INTRODUCTION Acute Myeloid Leukemia 1-Eight-Twenty-One (AML1-ETO) is an oncogenic fusion protein that causes acute myeloid leukemia. We examined the effects of melatonin on AML1-ETO by investigating cell differentiation, apoptosis, and degradation in leukemia cell lines. METHOD We evaluated Kasumi-1, U937T, and primary acute myeloid leukemia (AML1-ETO-positive) cell proliferation by Cell Counting Kit-8 assay. Flow cytometry and western blotting were used to evaluate CD11b/CD14 levels (differentiation biomarkers) and the AML1-ETO protein degradation pathway, respectively. CM-Dil-labeled Kasumi-1 cells were also injected into zebrafish embryos to determine the effects of melatonin on vascular proliferation and development and to evaluate the combined effects of melatonin and common chemotherapeutic agents. RESULTS AML1-ETO-positive acute myeloid leukemia cells were more sensitive to melatonin than AML1-ETO-negative cells. Melatonin increased apoptosis and CD11b/CD14 expression in AML1-ETO-positive cells and decreased the nuclear/cytoplasmic ratio, together suggesting that melatonin induced cell differentiation. Mechanistically, melatonin degraded AML1-ETO by activating the caspase-3 pathway and regulating the mRNA levels of AML1-ETO downstream genes. Melatonin reduced the number of neovessels in Kasumi-1-injected zebrafish, suggesting that melatonin inhibits cell proliferation in vivo. Finally, combining drugs with melatonin inhibited cell viability. DISCUSSION Melatonin is a potential compound for the treatment of AML1-ETO-positive acute myeloid leukemia.
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Affiliation(s)
- Xuling Liu
- The First Affiliated Hospital of Wenzhou Medical University, Department of Pathology, Xuefu Road, Ouhai District, Wenzhou 325000, Zhejiang Province, China
| | - Wenwen Sun
- The First Affiliated Hospital of Wenzhou Medical University, Department of Pathology, Xuefu Road, Ouhai District, Wenzhou 325000, Zhejiang Province, China
| | - Leilei Wang
- The First Affiliated Hospital of Wenzhou Medical University, Department of Anesthesiology, Xuefu Road, Ouhai District, Wenzhou 325000, Zhejiang Province, China
| | - Bin Zhou
- Medical Research Center, The First Affiliated Hospital of Wenzhou Medical University, Xuefu Road, Ouhai District, Wenzhou 325000, Zhejiang Province, China
| | - Peng Li
- The First Affiliated Hospital of Wenzhou Medical University, Department of Pathology, Xuefu Road, Ouhai District, Wenzhou 325000, Zhejiang Province, China.
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Rejeski K, Duque-Afonso J, Lübbert M. AML1/ETO and its function as a regulator of gene transcription via epigenetic mechanisms. Oncogene 2021; 40:5665-5676. [PMID: 34331016 PMCID: PMC8460439 DOI: 10.1038/s41388-021-01952-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 06/11/2021] [Accepted: 07/07/2021] [Indexed: 01/10/2023]
Abstract
The chromosomal translocation t(8;21) and the resulting oncofusion gene AML1/ETO have long served as a prototypical genetic lesion to model and understand leukemogenesis. In this review, we describe the wide-ranging role of AML1/ETO in AML leukemogenesis, with a particular focus on the aberrant epigenetic regulation of gene transcription driven by this AML-defining mutation. We begin by analyzing how structural changes secondary to distinct genomic breakpoints and splice changes, as well as posttranscriptional modifications, influence AML1/ETO protein function. Next, we characterize how AML1/ETO recruits chromatin-modifying enzymes to target genes and how the oncofusion protein alters chromatin marks, transcription factor binding, and gene expression. We explore the specific impact of these global changes in the epigenetic network facilitated by the AML1/ETO oncofusion on cellular processes and leukemic growth. Furthermore, we define the genetic landscape of AML1/ETO-positive AML, presenting the current literature concerning the incidence of cooperating mutations in genes such as KIT, FLT3, and NRAS. Finally, we outline how alterations in transcriptional regulation patterns create potential vulnerabilities that may be exploited by epigenetically active agents and other therapeutics.
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Affiliation(s)
- Kai Rejeski
- Department of Hematology, Oncology and Stem Cell Transplantation, University of Freiburg Medical Center, Freiburg, Germany.,Department of Hematology and Oncology, University Hospital of the LMU Munich, Munich, Germany.,German Cancer Consortium (DKTK) Freiburg Partner Site, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Jesús Duque-Afonso
- Department of Hematology, Oncology and Stem Cell Transplantation, University of Freiburg Medical Center, Freiburg, Germany.,Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Michael Lübbert
- Department of Hematology, Oncology and Stem Cell Transplantation, University of Freiburg Medical Center, Freiburg, Germany. .,German Cancer Consortium (DKTK) Freiburg Partner Site, German Cancer Research Center (DKFZ), Heidelberg, Germany. .,Faculty of Medicine, University of Freiburg, Freiburg, Germany.
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