1
|
Shin CH, Rossi M, Anerillas C, Martindale JL, Yang X, Ji E, Pal A, Munk R, Yang JH, Tsitsipatis D, Mazan-Mamczarz K, Abdelmohsen K, Gorospe M. Increased ANKRD1 Levels in Early Senescence Mediated by RBMS1-Elicited ANKRD1 mRNA Stabilization. Mol Cell Biol 2024; 44:194-208. [PMID: 38769646 PMCID: PMC11123458 DOI: 10.1080/10985549.2024.2350540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Accepted: 04/25/2024] [Indexed: 05/22/2024] Open
Abstract
Cellular senescence is a dynamic biological process triggered by sublethal cell damage and driven by specific changes in gene expression programs. We recently identified ANKRD1 (ankyrin repeat domain 1) as a protein strongly elevated after triggering senescence in fibroblasts. Here, we set out to investigate the mechanisms driving the elevated production of ANKRD1 in the early stages of senescence. Our results indicated that the rise in ANKRD1 levels after triggering senescence using etoposide (Eto) was the result of moderate increases in transcription and translation, and robust mRNA stabilization. Antisense oligomer (ASO) pulldown followed by mass spectrometry revealed a specific interaction of the RNA-binding protein RBMS1 with ANKRD1 mRNA that was confirmed by ribonucleoprotein immunoprecipitation analysis. RBMS1 abundance decreased in the nucleus and increased in the cytoplasm during Eto-induced senescence; in agreement with the hypothesis that RBMS1 may participate in post-transcriptional stabilization of ANKRD1 mRNA, silencing RBMS1 reduced, while overexpressing RBMS1 enhanced ANKRD1 mRNA half-life after Eto treatment. A segment proximal to the ANKRD1 coding region was identified as binding RBMS1 and conferring RBMS1-dependent increased expression of a heterologous reporter. We propose that RBMS1 increases expression of ANKRD1 during the early stages of senescence by stabilizing ANKRD1 mRNA.
Collapse
Affiliation(s)
- Chang Hoon Shin
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Martina Rossi
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Carlos Anerillas
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Jennifer L. Martindale
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Xiaoling Yang
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Eunbyul Ji
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Apala Pal
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Rachel Munk
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Jen-Hao Yang
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Dimitrios Tsitsipatis
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Krystyna Mazan-Mamczarz
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Kotb Abdelmohsen
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| | - Myriam Gorospe
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, Maryland, USA
| |
Collapse
|
2
|
Xing X, Xu P, Xing X, Xu Z, Huang Z, Li Z, Li X, Xiao Y. Effects of ADSC-Derived Exosome LRRC75A-AS1 on Anti-inflammatory Function After SCI. Appl Biochem Biotechnol 2024:10.1007/s12010-023-04836-9. [PMID: 38165592 DOI: 10.1007/s12010-023-04836-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/19/2023] [Indexed: 01/04/2024]
Abstract
Spinal cord injury (SCI) is a highly debilitating disorder of the central nervous system that can severely impact an affected patient's quality of life. This study aimed to examine how adipose-derived mesenchymal stem cell exosomes (ADSC-exos) can be used to treat spinal cord injury. We analysed differentially expressed mRNAs in SCI using bioinformatics data, gene expression profiles in inflammatory cell models, RT-qPCR and WB. Apoptosis was detected with flow cytometry. Starbase provides the control mechanism for FDFT1. Target interactions were detected with dual-luciferase reporter and RIP assays. Exosomes were isolated from adipose tissue-derived mesenchymal stem cells and subsequently characterized with western blot analysis, transmission electron microscopy and nanoparticle tracking analysis. By analysing the GSE102964 database, we found that FDFT1 was significantly downregulated as SCI progressed. Overexpression of FDFT1 can significantly reverse the inflammatory response and apoptosis of BV2 cells induced by hemin. Mechanically, ADSC-exos can affect the expression of FDFT1 through the ceRNA mechanism mediated by LRRC75A-AS1 and in an RBP-dependent manner mediated by IGF2BP2. The overexpression of LRRC75A-AS1 significantly enhances BV2 apoptosis and can be reversed by FDFT1 knockdown. ADSC-exos LRRC75A-AS1 inhibits inflammation and reduces SCI by increasing the expression and stability of FDFT1 mRNA in a ceRNA and RBP-dependent manner.
Collapse
Affiliation(s)
- Xiaohui Xing
- Department of Neurosurgery, Liaocheng People's Hospital, No. 67 Dongchang West Road, Liaocheng, 252000, China
| | - Peng Xu
- Department of Neurosurgery, Liaocheng People's Hospital, No. 67 Dongchang West Road, Liaocheng, 252000, China
| | - Xiaoyang Xing
- Department of Laboratory, Liaocheng Maternal and Child Health Care Hospital, No.56, Changjiang Road, Liaocheng, 252000, Shandong, China
| | - Zhentao Xu
- Department of Neurosurgery, Liaocheng People's Hospital, No. 67 Dongchang West Road, Liaocheng, 252000, China
| | - Zhen Huang
- Department of Neurosurgery, Liaocheng People's Hospital, No. 67 Dongchang West Road, Liaocheng, 252000, China
| | - Zhongchen Li
- Department of Neurosurgery, Liaocheng People's Hospital, No. 67 Dongchang West Road, Liaocheng, 252000, China
| | - Xueyuan Li
- Department of Neurosurgery, Liaocheng People's Hospital, No. 67 Dongchang West Road, Liaocheng, 252000, China.
| | - Yilei Xiao
- Department of Neurosurgery, Liaocheng People's Hospital, No. 67 Dongchang West Road, Liaocheng, 252000, China.
| |
Collapse
|
3
|
Zhang J, Xu J, Li S, Chen W, Wu Y. Electroacupuncture Relieves HuR/KLF9-Mediated Inflammation to Enhance Neurological Repair after Spinal Cord Injury. eNeuro 2023; 10:ENEURO.0190-23.2023. [PMID: 37940560 PMCID: PMC10668228 DOI: 10.1523/eneuro.0190-23.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 10/25/2023] [Accepted: 10/29/2023] [Indexed: 11/10/2023] Open
Abstract
Electroacupuncture (EA) is widely applied in clinical therapy for spinal cord injury (SCI). However, the associated molecular mechanism has yet to be elucidated. The current study aimed to investigate the underlying mechanism of EA in neurologic repair after SCI. First, we investigated the role of EA in the neurologic repair of the SCI rat model. The expression levels of human antigen R (HuR) and Krüppel-like factor 9 (KLF9) in spinal cord tissues were quantified after treatment. Second, we conducted bioinformatics analysis, RNA pull-down assays, RNA immunoprecipitation, and luciferase reporter gene assay to verify the binding of HuR and KLF9 mRNA for mRNA stability. Last, HuR inhibitor CMLD-2 was used to verify the enhanced effect of EA on neurologic repair after SCI via the HuR/KLF9 axis. Our data provided convincing evidence that EA facilitated the recovery of neuronal function in SCI rats by reducing apoptosis and inflammation of neurons. We found that EA significantly diminished the SCI-mediated upregulation of HuR, and HuR could bind to the 3' untranslated region of KLF9 mRNA to protect its decay. In addition, a series of in vivo experiments confirmed that CMLD-2 administration increased EA-mediated pain thresholds and motor function in SCI rats. Collectively, the present study showed that EA improved pain thresholds and motor function in SCI rats via impairment of HuR-mediated KLF9 mRNA stabilization, thus providing a better understanding of the regulatory mechanisms regarding EA-mediated neurologic repair after SCI.
Collapse
Affiliation(s)
- Junfeng Zhang
- Department of Acupuncture, Tuina and Traumatology, The Sixth People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai 200233, People's Republic of China
| | - Jingjie Xu
- Department of Acupuncture, Tuina and Traumatology, The Sixth People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai 200233, People's Republic of China
| | - Shisheng Li
- Department of Acupuncture, Tuina and Traumatology, The Sixth People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai 200233, People's Republic of China
| | - Wei Chen
- Department of Acupuncture, Tuina and Traumatology, The Sixth People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai 200233, People's Republic of China
| | - Yaochi Wu
- Department of Acupuncture, Tuina and Traumatology, The Sixth People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai 200233, People's Republic of China
| |
Collapse
|
4
|
Wang C, Zhang X, Zhu X, Chen R, Lian N. The RNA binding protein HuR promotes neuronal apoptosis in rats with spinal cord injury via the HDAC1/RAD21 axis. Neuroscience 2023; 522:109-120. [PMID: 37164303 DOI: 10.1016/j.neuroscience.2023.04.026] [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: 01/31/2023] [Revised: 04/19/2023] [Accepted: 04/25/2023] [Indexed: 05/12/2023]
Abstract
The current research aims to study the regulation of the RNA binding protein HuR on neuronal apoptosis during spinal cord injury (SCI) and its underlying mechanism. SCI rat models were injected with HuR shRNA and/or pcDNA3.1-RAD21, followed by the evaluation of motor function, the degree of SCI, the expression of HuR and RAD21, and neuronal-like apoptosis. The co-localization of HuR-RAD21, RAD21-NeuN, and NeuN-cleaved caspase 3 was measured by immunofluorescence. Additionally, targeting relationships among HuR, HDAC1, and RAD21 were verified by chromatin immunoprecipitation and RNA immunoprecipitation. After transfection, apoptosis of PC12 cells was tested by flow cytometry. Results showed that silencing HuR or up-regulating RAD21 could alleviate SCI and reduce neuronal apoptosis. HuR could combine HDAC1 mRNA, and HDAC1 combined the promoter of RAD21. Further experiments revealed that HuR enhanced HDAC1 expression and reduced RAD21 promoter region acetylation. Overexpression of RAD21 reversed the enhancement in apoptosis of PC12 cells caused by overexpression of HuR. The injection of HuR shRNA in tail vein of SCI rats increased basso, beattie, and bresnahan score, relieved SCI, reduced HuR and HDAC1 expression, elevated RAD21 expression, and decreased neuronal-like apoptosis. However, this result was reversed by co-injection of pcDNA3.1-HDAC1. In conclusion, down-regulation of HuR alleviated SCI and neuronal apoptosis in rats by suppressing HDAC1 expression and promoting RAD21 expression.
Collapse
Affiliation(s)
- Changsheng Wang
- Department of Orthopedics, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou, Fujian 350212, P.R. China; Department of Spinal Surgery, First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350005, P.R. China.
| | - Xiaobo Zhang
- Department of Spinal Surgery, First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350005, P.R. China
| | - Xitian Zhu
- Department of Spinal Surgery, First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350005, P.R. China
| | - Rongsheng Chen
- Department of Spinal Surgery, First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350005, P.R. China
| | - Nancheng Lian
- Department of Spinal Surgery, First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350005, P.R. China
| |
Collapse
|
5
|
Guha A, Husain MA, Si Y, Nabors LB, Filippova N, Promer G, Smith R, King PH. RNA regulation of inflammatory responses in glia and its potential as a therapeutic target in central nervous system disorders. Glia 2023; 71:485-508. [PMID: 36380708 DOI: 10.1002/glia.24288] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/29/2022] [Accepted: 10/14/2022] [Indexed: 11/17/2022]
Abstract
A major hallmark of neuroinflammation is the activation of microglia and astrocytes with the induction of inflammatory mediators such as IL-1β, TNF-α, iNOS, and IL-6. Neuroinflammation contributes to disease progression in a plethora of neurological disorders ranging from acute CNS trauma to chronic neurodegenerative disease. Posttranscriptional pathways of mRNA stability and translational efficiency are major drivers for the expression of these inflammatory mediators. A common element in this level of regulation centers around the adenine- and uridine-rich element (ARE) which is present in the 3' untranslated region (UTR) of the mRNAs encoding these inflammatory mediators. (ARE)-binding proteins (AUBPs) such as Human antigen R (HuR), Tristetraprolin (TTP) and KH- type splicing regulatory protein (KSRP) are key nodes for directing these posttranscriptional pathways and either promote (HuR) or suppress (TTP and KSRP) glial production of inflammatory mediators. This review will discuss basic concepts of ARE-mediated RNA regulation and its impact on glial-driven neuroinflammatory diseases. We will discuss strategies to target this novel level of gene regulation for therapeutic effect and review exciting preliminary studies that underscore its potential for treating neurological disorders.
Collapse
Affiliation(s)
- Abhishek Guha
- Department Neurology, The University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Mohammed Amir Husain
- Department Neurology, The University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Ying Si
- Department Neurology, The University of Alabama at Birmingham, Birmingham, Alabama, USA.,Department Cell, Developmental, and Integrative Biology, The University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - L Burt Nabors
- Department Neurology, The University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Natalia Filippova
- Department Neurology, The University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Grace Promer
- Department Neurology, The University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Reed Smith
- Department Neurology, The University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Peter H King
- Department Neurology, The University of Alabama at Birmingham, Birmingham, Alabama, USA.,Department Cell, Developmental, and Integrative Biology, The University of Alabama at Birmingham, Birmingham, Alabama, USA.,Birmingham Department of Veterans Health Care System, Birmingham, Alabama, USA.,Center for Neurodegeneration and Experimental Therapeutics, The University of Alabama at Birmingham, Birmingham, USA
| |
Collapse
|
6
|
Sorge RE, Si Y, Norian LA, Guha A, Moore GE, Nabors LB, Filippova N, Yang X, Smith R, Chellappan R, King PH. Inhibition of the RNA Regulator HuR by SRI-42127 Attenuates Neuropathic Pain After Nerve Injury Through Suppression of Neuroinflammatory Responses. Neurotherapeutics 2022; 19:1649-1661. [PMID: 35864415 PMCID: PMC9606176 DOI: 10.1007/s13311-022-01278-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/10/2022] [Indexed: 12/14/2022] Open
Abstract
Microglial activation with the production of pro-inflammatory mediators such as IL-6, TNF-α, and IL-1β, is a major driver of neuropathic pain (NP) following peripheral nerve injury. We have previously shown that the RNA binding protein, HuR, is a positive node of regulation for many of these inflammatory mediators in glia and that its chemical inhibition or genetic deletion attenuates their production. In this report, we show that systemic administration of SRI-42127, a novel small molecule HuR inhibitor, attenuates mechanical allodynia, a hallmark of NP, in the early and chronic phases after spared nerve injury in male and female mice. Flow cytometry of lumbar spinal cords in SRI-42127-treated mice shows a reduction in infiltrating macrophages and a concomitant decrease in microglial populations expressing IL-6, TNF-α, IL-1β, and CCL2. Immunohistochemistry, ELISA, and qPCR of lumbar spinal cord tissue indicate suppression of these cytokines and other inflammatory mediators. ELISA of plasma samples in the acute phase also shows attenuation of inflammatory responses. In summary, inhibition of HuR by SRI-42127 leads to the suppression of neuroinflammatory responses and allodynia after nerve injury and represents a promising new direction in the treatment of NP.
Collapse
Affiliation(s)
- Robert E Sorge
- Department of Psychology, The University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Ying Si
- Department of Neurology, The University of Alabama at Birmingham, Civitan 545C, 1719 6th Ave. South, Birmingham, AL, 35294, USA
- Birmingham Veterans Affairs Medical Center, Birmingham, AL, 35294, USA
| | - Lyse A Norian
- Department of Nutrition Sciences, The University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Abhishek Guha
- Department of Neurology, The University of Alabama at Birmingham, Civitan 545C, 1719 6th Ave. South, Birmingham, AL, 35294, USA
| | - Grace E Moore
- Department of Psychology, The University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - L Burt Nabors
- Department of Neurology, The University of Alabama at Birmingham, Civitan 545C, 1719 6th Ave. South, Birmingham, AL, 35294, USA
| | - Natalia Filippova
- Department of Neurology, The University of Alabama at Birmingham, Civitan 545C, 1719 6th Ave. South, Birmingham, AL, 35294, USA
| | - Xiuhua Yang
- Department of Neurology, The University of Alabama at Birmingham, Civitan 545C, 1719 6th Ave. South, Birmingham, AL, 35294, USA
| | - Reed Smith
- Department of Neurology, The University of Alabama at Birmingham, Civitan 545C, 1719 6th Ave. South, Birmingham, AL, 35294, USA
| | - Rajeshwari Chellappan
- Department of Neurology, The University of Alabama at Birmingham, Civitan 545C, 1719 6th Ave. South, Birmingham, AL, 35294, USA
- Birmingham Veterans Affairs Medical Center, Birmingham, AL, 35294, USA
| | - Peter H King
- Department of Neurology, The University of Alabama at Birmingham, Civitan 545C, 1719 6th Ave. South, Birmingham, AL, 35294, USA.
- Department of Cell, Developmental, and Integrative Biology, The University of Alabama at Birmingham, Birmingham, AL, 35294, USA.
- Center for Neurodegeneration and Experimental Therapeutics, The University of Alabama at Birmingham, Birmingham, AL, 35294, USA.
- Birmingham Veterans Affairs Medical Center, Birmingham, AL, 35294, USA.
| |
Collapse
|
7
|
Zhou HJ, Wang LQ, Zhan RY, Zheng XJ, Zheng JS. lncRNA MEG3 restrained the M1 polarization of microglia in acute spinal cord injury through the HuR/A20/NF-κB axis. Brain Pathol 2022; 32:e13070. [PMID: 35338543 PMCID: PMC9425005 DOI: 10.1111/bpa.13070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Revised: 12/31/2021] [Accepted: 03/09/2022] [Indexed: 11/28/2022] Open
Abstract
The M1 polarization of microglia and neuroinflammation restrict the treatment of acute spinal cord injury (ASCI), and long non‐coding ribonucleic acid (lncRNA) maternally expressed gene 3 (MEG3) expression is lessened in ASCI. However, the function and mechanism of lncRNA MEG3 in the M1 polarization of microglia and neuroinflammation in ASCI are unclear. The expressions of lncRNA MEG3 in ASCI mouse spinal cord tissues and lipopolysaccharide (LPS)‐treated primary microglia and BV2 cells were quantified through a quantitative real‐time polymerase chain reaction. In‐vitro assays were conducted to explore the function of lncRNA MEG3 in the M1 polarization of microglia and neuroinflammation in ASCI. RNA degradation, RNA immunoprecipitation, RNA pull‐down, cycloheximide‐chase, and ubiquitination analyses were carried out to probe into the mechanism of lncRNA MEG3 in the M1 polarization of microglia and neuroinflammation in ASCI. The lncRNA MEG3 expression was lessened in the ASCI mouse spinal cord tissues and LPS‐treated primary microglia and BV2 cells, and the overexpression of lncRNA MEG3 restrained the M1 polarization of microglia and the neuroinflammation by regulating the NF‐κB signaling pathway. For the investigation of the potential mechanism of such, the overexpression of lncRNA MEG3 restrained the M1 polarization of microglia through the HuR/A20/NF‐κB axis and boosted the motor function recovery and neuroinflammation relief in the mice with SCI. The overexpression of lncRNA MEG3 restrained the M1 polarization of microglia through the HuR/A20/NF‐κB axis.
Collapse
Affiliation(s)
- Heng-Jun Zhou
- Department of Neurosurgery, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Li-Qing Wang
- Department of Anesthesiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Ren-Ya Zhan
- Department of Neurosurgery, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Xiu-Jue Zheng
- Department of Neurosurgery, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Jie-Sheng Zheng
- Department of Neurosurgery, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| |
Collapse
|
8
|
Guha A, Waris S, Nabors LB, Filippova N, Gorospe M, Kwan T, King PH. The versatile role of HuR in Glioblastoma and its potential as a therapeutic target for a multi-pronged attack. Adv Drug Deliv Rev 2022; 181:114082. [PMID: 34923029 PMCID: PMC8916685 DOI: 10.1016/j.addr.2021.114082] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 10/15/2021] [Accepted: 12/12/2021] [Indexed: 02/03/2023]
Abstract
Glioblastoma (GBM) is a malignant and aggressive brain tumor with a median survival of ∼15 months. Resistance to treatment arises from the extensive cellular and molecular heterogeneity in the three major components: glioma tumor cells, glioma stem cells, and tumor-associated microglia and macrophages. Within this triad, there is a complex network of intrinsic and secreted factors that promote classic hallmarks of cancer, including angiogenesis, resistance to cell death, proliferation, and immune evasion. A regulatory node connecting these diverse pathways is at the posttranscriptional level as mRNAs encoding many of the key drivers contain adenine- and uridine rich elements (ARE) in the 3' untranslated region. Human antigen R (HuR) binds to ARE-bearing mRNAs and is a major positive regulator at this level. This review focuses on basic concepts of ARE-mediated RNA regulation and how targeting HuR with small molecule inhibitors represents a plausible strategy for a multi-pronged therapeutic attack on GBM.
Collapse
Affiliation(s)
- Abhishek Guha
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294, United States
| | - Saboora Waris
- Shaheed Zulfiqar Ali Bhutto Medical University, PIMS, G-8, Islamabad, Pakistan
| | - Louis B Nabors
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294, United States
| | - Natalia Filippova
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294, United States
| | - Myriam Gorospe
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, MD 21224, United States
| | - Thaddaeus Kwan
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294, United States
| | - Peter H King
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294, United States; Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL 35294, United States; Birmingham Veterans Affairs Medical Center, Birmingham, AL 35294, United States.
| |
Collapse
|
9
|
Chellappan R, Guha A, Si Y, Kwan T, Nabors LB, Filippova N, Yang X, Myneni AS, Meesala S, Harms AS, King PH. SRI-42127, a novel small molecule inhibitor of the RNA regulator HuR, potently attenuates glial activation in a model of lipopolysaccharide-induced neuroinflammation. Glia 2022; 70:155-172. [PMID: 34533864 PMCID: PMC8595840 DOI: 10.1002/glia.24094] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 09/03/2021] [Accepted: 09/06/2021] [Indexed: 01/03/2023]
Abstract
Glial activation with the production of pro-inflammatory mediators is a major driver of disease progression in neurological processes ranging from acute traumatic injury to chronic neurodegenerative diseases such as amyotrophic lateral sclerosis and Alzheimer's disease. Posttranscriptional regulation is a major gateway for glial activation as many mRNAs encoding pro-inflammatory mediators contain adenine- and uridine-rich elements (ARE) in the 3' untranslated region which govern their expression. We have previously shown that HuR, an RNA regulator that binds to AREs, plays a major positive role in regulating inflammatory cytokine production in glia. HuR is predominantly nuclear in localization but translocates to the cytoplasm to exert a positive regulatory effect on RNA stability and translational efficiency. Homodimerization of HuR is necessary for translocation and we have developed a small molecule inhibitor, SRI-42127, that blocks this process. Here we show that SRI-42127 suppressed HuR translocation in LPS-activated glia in vitro and in vivo and significantly attenuated the production of pro-inflammatory mediators including IL1β, IL-6, TNF-α, iNOS, CXCL1, and CCL2. Cytokines typically associated with anti-inflammatory effects including TGF-β1, IL-10, YM1, and Arg1 were either unaffected or minimally affected. SRI-42127 suppressed microglial activation in vivo and attenuated the recruitment/chemotaxis of neutrophils and monocytes. RNA kinetic studies and luciferase studies indicated that SRI-42127 has inhibitory effects both on mRNA stability and gene promoter activation. In summary, our findings underscore HuR's critical role in promoting glial activation and the potential for SRI-42127 and other HuR inhibitors for treating neurological diseases driven by this activation.
Collapse
Affiliation(s)
- Rajeshwari Chellappan
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294,,Birmingham Veterans Affairs Medical Center, Birmingham, AL 35294
| | - Abhishek Guha
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Ying Si
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294,,Birmingham Veterans Affairs Medical Center, Birmingham, AL 35294
| | - Thaddaeus Kwan
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - L. Burt Nabors
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Natalia Filippova
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Xiuhua Yang
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Anish S. Myneni
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Shriya Meesala
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Ashley S Harms
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Peter H. King
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294,,Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL 35294,,Birmingham Veterans Affairs Medical Center, Birmingham, AL 35294,Correspondence to: Dr. P.H. King; UAB Dept. of Neurology, Civitan 545C, 1530 3 Avenue South, Birmingham, AL 35294-0017, USA. Tel. (205) 975-8116; Fax (205) 996-7255;
| |
Collapse
|
10
|
Borgonetti V, Coppi E, Galeotti N. Targeting the RNA-Binding Protein HuR as Potential Thera-Peutic Approach for Neurological Disorders: Focus on Amyo-Trophic Lateral Sclerosis (ALS), Spinal Muscle Atrophy (SMA) and Multiple Sclerosis. Int J Mol Sci 2021; 22:ijms221910394. [PMID: 34638733 PMCID: PMC8508990 DOI: 10.3390/ijms221910394] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/22/2021] [Accepted: 09/24/2021] [Indexed: 01/03/2023] Open
Abstract
The importance of precise co- and post-transcriptional processing of RNA in the regulation of gene expression has become increasingly clear. RNA-binding proteins (RBPs) are a class of proteins that bind single- or double-chain RNA, with different affinities and selectivity, thus regulating the various functions of RNA and the fate of the cells themselves. ELAV (embryonic lethal/abnormal visual system)/Hu proteins represent an important family of RBPs and play a key role in the fate of newly transcribed mRNA. ELAV proteins bind AU-rich element (ARE)-containing transcripts, which are usually present on the mRNA of proteins such as cytokines, growth factors, and other proteins involved in neuronal differentiation and maintenance. In this review, we focused on a member of ELAV/Hu proteins, HuR, and its role in the development of neurodegenerative disorders, with a particular focus on demyelinating diseases.
Collapse
|
11
|
Wang G, Wang J, Xin C, Xiao J, Liang J, Wu X. Inflammatory response in epilepsy is mediated by glial cell gap junction pathway (Review). Mol Med Rep 2021; 24:493. [PMID: 33955516 PMCID: PMC8127031 DOI: 10.3892/mmr.2021.12132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 04/21/2021] [Indexed: 01/31/2023] Open
Abstract
Epilepsy is a common neurological disease that affects more than 50 million people worldwide. Neuroinflammation plays an important role in epilepsy. Activation of the immune system and an excessive inflammatory response can increase the frequency of seizures and increase the susceptibility to epilepsy. Therefore, anti-inflammatory therapies may have antiepileptic effects. Connexin 43 (Cx43) is a major component of astroglial hemichannels and gap junctions. Gap junctions are important for the direct exchange of substances and information between cells, as well as regulating the neuroinflammatory response, changing neuronal excitability, neuronal apoptosis, and synaptic remodeling. Cx43-mediated gap junction pathway can be crucial in epilepsy-induced neuroinflammatory cascades. Further, pro-inflammatory cytokines may in turn directly affect the expression of the Cx43 protein in astrocytes. Therefore, examining the association between neuroinflammation and epilepsy can be instrumental in uncovering the pathogenesis of epilepsy, which can lead to the development of novel and more effective antiepileptic drugs.
Collapse
Affiliation(s)
- Guangliang Wang
- Department of Cardiology, Dalinghe Hospital of Far Eastern Horizon, Linghai, Liaoning 121200, P.R. China
| | - Jiangtao Wang
- Department of Pediatric Neurology, Jilin University, Changchun, Jilin 130000, P.R. China
| | - Cuijuan Xin
- Department of Pediatric Neurology, Jilin University, Changchun, Jilin 130000, P.R. China
| | - Jinyu Xiao
- Department of Pediatric Neurology, Jilin University, Changchun, Jilin 130000, P.R. China
| | - Jianmin Liang
- Department of Pediatric Neurology, Jilin University, Changchun, Jilin 130000, P.R. China
| | - Xuemei Wu
- Department of Pediatric Neurology, Jilin University, Changchun, Jilin 130000, P.R. China
| |
Collapse
|
12
|
Mazaré N, Oudart M, Cohen-Salmon M. Local translation in perisynaptic and perivascular astrocytic processes - a means to ensure astrocyte molecular and functional polarity? J Cell Sci 2021; 134:237323. [PMID: 33483366 DOI: 10.1242/jcs.251629] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Together with the compartmentalization of mRNAs in distal regions of the cytoplasm, local translation constitutes a prominent and evolutionarily conserved mechanism mediating cellular polarization and the regulation of protein delivery in space and time. The translational regulation of gene expression enables a rapid response to stimuli or to a change in the environment, since the use of pre-existing mRNAs can bypass time-consuming nuclear control mechanisms. In the brain, the translation of distally localized mRNAs has been mainly studied in neurons, whose cytoplasmic protrusions may be more than 1000 times longer than the diameter of the cell body. Importantly, alterations in local translation in neurons have been implicated in several neurological diseases. Astrocytes, the most abundant glial cells in the brain, are voluminous, highly ramified cells that project long processes to neurons and brain vessels, and dynamically regulate distal synaptic and vascular functions. Recent research has demonstrated the presence of local translation at these astrocytic interfaces that might regulate the functional compartmentalization of astrocytes. In this Review, we summarize our current knowledge about the localization and local translation of mRNAs in the distal perisynaptic and perivascular processes of astrocytes, and discuss their possible contribution to the molecular and functional polarity of astrocytes.
Collapse
Affiliation(s)
- Noémie Mazaré
- Physiology and Physiopathology of the Gliovascular Unit Research Group, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS Unité Mixte de Recherche 724, INSERM Unité 1050, Labex Memolife, PSL Research University, F-75005 Paris, France.,École doctorale Cerveau Cognition Comportement 'ED3C' No. 158, Pierre and Marie Curie University, F-75005 Paris, France
| | - Marc Oudart
- Physiology and Physiopathology of the Gliovascular Unit Research Group, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS Unité Mixte de Recherche 724, INSERM Unité 1050, Labex Memolife, PSL Research University, F-75005 Paris, France.,École doctorale Cerveau Cognition Comportement 'ED3C' No. 158, Pierre and Marie Curie University, F-75005 Paris, France
| | - Martine Cohen-Salmon
- Physiology and Physiopathology of the Gliovascular Unit Research Group, Center for Interdisciplinary Research in Biology (CIRB), College de France, CNRS Unité Mixte de Recherche 724, INSERM Unité 1050, Labex Memolife, PSL Research University, F-75005 Paris, France .,École doctorale Cerveau Cognition Comportement 'ED3C' No. 158, Pierre and Marie Curie University, F-75005 Paris, France
| |
Collapse
|
13
|
Li J, Durose WW, Ito J, Kakita A, Iguchi Y, Katsuno M, Kunisawa K, Shimizu T, Ikenaka K. Exploring the factors underlying remyelination arrest by studying the post-transcriptional regulatory mechanisms of cystatin F gene. J Neurochem 2020; 157:2070-2090. [PMID: 32947653 DOI: 10.1111/jnc.15190] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 08/11/2020] [Accepted: 09/07/2020] [Indexed: 12/20/2022]
Abstract
Remyelination plays an important role in determining the fate of demyelinating disorders. However, it is arrested during chronic disease states. Cystatin F, a papain-like lysosomal cysteine proteinase inhibitor, is a crucial regulator of demyelination and remyelination. Using hemizygous proteolipid protein transgenic 4e (PLP4e/- ) mice, an animal model of chronic demyelination, we found that cystatin F mRNA expression was induced at 2.5 months of age and up-regulated in the early phase of demyelination, but significantly decreased in the chronic phase. We next investigated cystatin F regulatory factors as potential mechanisms of remyelination arrest in chronic demyelinating disorders. We used the CysF-STOP-tetO::Iba-mtTA mouse model, in which cystatin F gene expression is driven by the tetracycline operator. Interestingly, we found that forced cystatin F mRNA over-expression was eventually decreased. Our findings show that cystatin F expression is modulated post-transcriptionally. We next identified embryonic lethal, abnormal vision, drosophila like RNA-binding protein 1 (ELAVL-1), and miR29a as cystatin F mRNA stabilizing and destabilizing factors, respectively. These roles were confirmed in vitro in NIH3T3 cells. Using postmortem plaque samples from human multiple sclerosis patients, we also confirmed that ELAVL-1 expression was highly correlated with the previously reported expression pattern of cystatin F. These data indicate the important roles of ELAVL-1 and miR29a in regulating cystatin F expression. Furthermore, they provide new insights into potential therapeutic targets for demyelinating disorders.
Collapse
Affiliation(s)
- Jiayi Li
- Division of Neurobiology and Bioinformatics, National Institute for Physiological Sciences, Okazaki, Japan.,Department of Physiological Sciences, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), Okazaki, Japan.,Department of Neurology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Wilaiwan Wisessmith Durose
- Division of Neurobiology and Bioinformatics, National Institute for Physiological Sciences, Okazaki, Japan.,Department of Physiological Sciences, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), Okazaki, Japan.,Research Center for Neuroscience, Institute of Molecular Biosciences, Mahidol University, Salaya, Nakhonpathom, Thailand.,Department of Pediatrics, Hematology University of Minnesota, Minneapolis, MN, USA
| | - Junko Ito
- Department of Pathology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Akiyoshi Kakita
- Department of Pathology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Yohei Iguchi
- Department of Neurology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Masahisa Katsuno
- Department of Neurology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kazuo Kunisawa
- Division of Neurobiology and Bioinformatics, National Institute for Physiological Sciences, Okazaki, Japan.,Department of Physiological Sciences, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), Okazaki, Japan.,Research Division of Advanced Diagnostic System, Graduate School of Health Sciences, Fujita Health University, Toyoake, Japan
| | - Takeshi Shimizu
- Division of Neurobiology and Bioinformatics, National Institute for Physiological Sciences, Okazaki, Japan.,Department of Physiological Sciences, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), Okazaki, Japan.,Department of Neurophysiology and Brain Science, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Aichi, Japan
| | - Kazuhiro Ikenaka
- Division of Neurobiology and Bioinformatics, National Institute for Physiological Sciences, Okazaki, Japan.,Department of Physiological Sciences, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), Okazaki, Japan
| |
Collapse
|
14
|
Li X, Lou X, Xu S, Du J, Wu J. Hypoxia inducible factor-1 (HIF-1α) reduced inflammation in spinal cord injury via miR-380-3p/ NLRP3 by Circ 0001723. Biol Res 2020; 53:35. [PMID: 32819442 PMCID: PMC7439692 DOI: 10.1186/s40659-020-00302-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 07/29/2020] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Spinal cord injury (SCI) is a severe central nervous system trauma. The present study aimed to evaluate the effect of HIF-1α on inflammation in spinal cord injury (SCI) to uncover the molecular mechanisms of anti-inflammation. RESULTS HIF-1α was reduced in SCI model rats and HIF-1α activation reduced TNF-α, IL-1β, IL-6 and IL-18 levels in SCI model rats. Meanwhile, Circ 0001723 expression was down-regulated and miR-380-3p expression was up-regulated in SCI model rats. In vitro model, down-regulation of Circ 0001723 promoted TNF-α, IL-1β, IL-6 and IL-18 levels, compared with control negative group. However, over-expression of Circ 0001723 reduced TNF-α, IL-1β, IL-6 and IL-18 levels in vitro model. Down-regulation of Circ 0001723 suppressed HIF-1α protein expressions and induced NLRP3 and Caspase-1 protein expressions in vitro model by up-regulation of miR-380-3p. Next, inactivation of HIF-1α reduced the pro-inflammation effects of Circ 0001723 in vitro model. Then, si-NLRP3 also inhibited the pro-inflammation effects of Circ 0001723 in vitro model via promotion of autophagy. CONCLUSIONS We concluded that HIF-1α reduced inflammation in spinal cord injury via miR-380-3p/ NLRP3 by Circ 0001723.
Collapse
Affiliation(s)
- Xigong Li
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Zhejiang University, No.79 Qingchun Road, Hangzhou, 310003, China
| | - Xianfeng Lou
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Zhejiang University, No.79 Qingchun Road, Hangzhou, 310003, China
| | - Sanzhong Xu
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Zhejiang University, No.79 Qingchun Road, Hangzhou, 310003, China.
| | - Junhua Du
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Zhejiang University, No.79 Qingchun Road, Hangzhou, 310003, China
| | - Junsong Wu
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Zhejiang University, No.79 Qingchun Road, Hangzhou, 310003, China
| |
Collapse
|
15
|
MicroRNA-223 targets NLRP3 to relieve inflammation and alleviate spinal cord injury. Life Sci 2020; 254:117796. [DOI: 10.1016/j.lfs.2020.117796] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 05/12/2020] [Accepted: 05/12/2020] [Indexed: 10/24/2022]
|
16
|
Libner CD, Salapa HE, Levin MC. The Potential Contribution of Dysfunctional RNA-Binding Proteins to the Pathogenesis of Neurodegeneration in Multiple Sclerosis and Relevant Models. Int J Mol Sci 2020; 21:E4571. [PMID: 32604997 PMCID: PMC7369711 DOI: 10.3390/ijms21134571] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 06/22/2020] [Accepted: 06/23/2020] [Indexed: 12/19/2022] Open
Abstract
Neurodegeneration in multiple sclerosis (MS) is believed to underlie disease progression and permanent disability. Many mechanisms of neurodegeneration in MS have been proposed, such as mitochondrial dysfunction, oxidative stress, neuroinflammation, and RNA-binding protein dysfunction. The purpose of this review is to highlight mechanisms of neurodegeneration in MS and its models, with a focus on RNA-binding protein dysfunction. Studying RNA-binding protein dysfunction addresses a gap in our understanding of the pathogenesis of MS, which will allow for novel therapies to be generated to attenuate neurodegeneration before irreversible central nervous system damage occurs.
Collapse
Affiliation(s)
- Cole D. Libner
- Department of Health Sciences, University of Saskatchewan, Saskatoon, SK S7N 5A2, Canada;
- Office of Saskatchewan Multiple Sclerosis Clinical Research Chair, CMSNRC (Cameco MS Neuroscience. Research Center), University of Saskatchewan, Saskatoon, SK S7K 0M7, Canada;
| | - Hannah E. Salapa
- Office of Saskatchewan Multiple Sclerosis Clinical Research Chair, CMSNRC (Cameco MS Neuroscience. Research Center), University of Saskatchewan, Saskatoon, SK S7K 0M7, Canada;
- Department of Medicine, Neurology Division, University of Saskatchewan, Saskatoon, SK S7N 5A2, Canada
| | - Michael C. Levin
- Office of Saskatchewan Multiple Sclerosis Clinical Research Chair, CMSNRC (Cameco MS Neuroscience. Research Center), University of Saskatchewan, Saskatoon, SK S7K 0M7, Canada;
- Department of Medicine, Neurology Division, University of Saskatchewan, Saskatoon, SK S7N 5A2, Canada
| |
Collapse
|
17
|
Wang J, Hjelmeland AB, Nabors LB, King PH. Anti-cancer effects of the HuR inhibitor, MS-444, in malignant glioma cells. Cancer Biol Ther 2019; 20:979-988. [PMID: 30991885 DOI: 10.1080/15384047.2019.1591673] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Glioblastoma is a highly malignant and typically fatal tumor of the central nervous system. The tumor is characterized by marked cellular and molecular heterogeneity, including a subpopulation of brain tumor initiating cells (BTICs) that are highly resistant to radiation and chemotherapy. We previously reported that the RNA-binding protein HuR is: (1) overexpressed in glioblastoma, (2) necessary for tumor growth in vivo, and (3) a positive regulator of tumor-promoting genes in glioblastoma. These findings provide strong evidence that HuR might be a viable therapeutic target in glioblastoma. In this report, we investigated the effects of MS-444, a small molecule inhibitor of HuR, in xenograft-derived human glioblastoma cells and BTICs. We found that MS-444 treatment of glioblastoma cells resulted in loss of viability and induction of apoptosis, with evidence implicating death receptor 5. BTICs were particularly sensitive to MS-444. At sub-lethal doses, MS-444 attenuated invasion of glioblastoma cells and BTICs in a transwell model. At the molecular level, MS-444 treatment led to an attenuation of mRNAs in different tumor promoting pathways including angiogenesis, immune evasion and suppression of apoptosis. Although cytoplasmic HuR was reduced with MS-444 treatment, the attenuation of mRNAs could not be explained by RNA destabilization. In summary, this report provides proof of concept that small molecule inhibition of HuR could be a viable approach for treatment of glioblastoma.
Collapse
Affiliation(s)
- Jiping Wang
- a Departments of Neurology , University of Alabama , Birmingham , AL
| | - Anita B Hjelmeland
- b Cell, Developmental, and Integrative Biology , University of Alabama , Birmingham , AL
| | - L Burt Nabors
- a Departments of Neurology , University of Alabama , Birmingham , AL
| | - Peter H King
- a Departments of Neurology , University of Alabama , Birmingham , AL.,b Cell, Developmental, and Integrative Biology , University of Alabama , Birmingham , AL.,c Birmingham Veterans Affairs Medical Center , Birmingham , AL
| |
Collapse
|
18
|
Tan Y, Yu L, Zhang C, Chen K, Lu J, Tan L. miRNA-146a attenuates inflammation in an in vitro spinal cord injury model via inhibition of TLR4 signaling. Exp Ther Med 2018; 16:3703-3709. [PMID: 30233729 DOI: 10.3892/etm.2018.6645] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 11/17/2017] [Indexed: 12/27/2022] Open
Abstract
The present study evaluated the anti-inflammatory effect of microRNA (miR)-146a in a spinal cord injury (SCI) rat model and in vitro model, and explored possible underlying mechanisms of this effect. miR-146a expression was analyzed using reverse transcription-quantitative polymerase chain reaction (RT-qPCR). Tumor necrosis factor (TNF)-α, interleukin (IL)-1β and IL-6 content was measured using ELISA kits. Inducible nitric oxide synthase (iNOS), prostaglandin E2 (PGE2), Toll-like receptor 4 (TLR4), myeloid differentiation primary response 88 (MyD88) and phosphorylated (p)-nuclear factor (NF)-κB were measured using western blotting. In the SCI rat model, miR-146a expression was downregulated. In the in vitro model, downregulation of miR-146a increased inflammation, enhanced iNOS and PGE2 protein expression and induced TLR4, MyD88 and NF-κB expression. Overexpression of miR-146a reduced inflammation, iNOS and PGE2 protein expression, and suppressed TLR4, MyD88 and NF-κB expression in the in vitro SCI model. The inhibition of TLR4 attenuated the proinflammatory effects of anti-miR-146a in the in vitro SCI model. The results indicate that miR-146a reduces inflammation in an SCI model through the TLR4-NF-κB signaling pathway. The present study demonstrated that miR-146a may be a promising therapeutic agent for SCI.
Collapse
Affiliation(s)
- Ying Tan
- Department of Spine Surgery, Weifang Traditional Chinese Medicine Hospital, Weifang, Shandong 261041, P.R. China
| | - Longtan Yu
- Department of Spine Surgery, Weifang Traditional Chinese Medicine Hospital, Weifang, Shandong 261041, P.R. China
| | - Chunming Zhang
- School of Medicine, Shandong University, Jinan, Shandong 250012, P.R. China.,Department of Orthopedics, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, Shandong 250014, P.R. China
| | - Kebing Chen
- Department of Spine Surgery, Third Affiliated Hospital of Southern Medical University, Guangzhou, Guangdong 510430, P.R. China
| | - Junfan Lu
- Department of Spine Surgery, Weifang Traditional Chinese Medicine Hospital, Weifang, Shandong 261041, P.R. China
| | - Lei Tan
- Department of Spine Surgery, Weifang Traditional Chinese Medicine Hospital, Weifang, Shandong 261041, P.R. China
| |
Collapse
|
19
|
Zhang D, Wang F, Zhai X, Li XH, He XJ. Lithium promotes recovery of neurological function after spinal cord injury by inducing autophagy. Neural Regen Res 2018; 13:2191-2199. [PMID: 30323152 PMCID: PMC6199946 DOI: 10.4103/1673-5374.241473] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Lithium promotes autophagy and has a neuroprotective effect on spinal cord injury (SCI); however, the underlying mechanisms remain unclear. Therefore, in this study, we investigated the effects of lithium and the autophagy inhibitor 3-methyladenine (3-MA) in a rat model of SCI. The rats were randomly assigned to the SCI, lithium, 3-MA and sham groups. In the 3-MA group, rats were intraperitoneally injected with 3-MA (3 mg/kg) 2 hours before SCI. In the lithium and 3-MA groups, rats were intraperitoneally injected with lithium (LiCl; 30 mg/kg) 6 hours after SCI and thereafter once daily until sacrifice. At 2, 3 and 4 weeks after SCI, neurological function and diffusion tensor imaging indicators were remarkably improved in the lithium group compared with the SCI and 3-MA groups. The Basso, Beattie and Bresnahan locomotor rating scale score and fractional anisotropy values were increased, and the apparent diffusion coefficient value was decreased. Immunohistochemical staining showed that immunoreactivities for Beclin-1 and light-chain 3B peaked 1 day after SCI in the lithium and SCI groups. Immunoreactivities for Beclin-1 and light-chain 3B were weaker in the 3-MA group than in the SCI group, indicating that 3-MA inhibits lithium-induced autophagy. Furthermore, NeuN+ neurons were more numerous in the lithium group than in the SCI and 3-MA groups, with the fewest in the latter. Our findings show that lithium reduces neuronal damage after acute SCI and promotes neurological recovery by inducing autophagy. The neuroprotective mechanism of action may not be entirely dependent on the enhancement of autophagy, and furthermore, 3-MA might not completely inhibit all autophagy pathways.
Collapse
Affiliation(s)
- Duo Zhang
- Department of Orthopedics, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Fang Wang
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, China
| | - Xu Zhai
- Department of Emergency, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, China
| | - Xiao-Hui Li
- Department of Radiology, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, China
| | - Xi-Jing He
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, China
| |
Collapse
|
20
|
Disease of mRNA Regulation: Relevance for Ischemic Brain Injury. Transl Stroke Res 2017; 9:251-257. [DOI: 10.1007/s12975-017-0586-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 11/01/2017] [Accepted: 11/03/2017] [Indexed: 12/25/2022]
|
21
|
Ardelt AA, Carpenter RS, Iwuchukwu I, Zhang A, Lin W, Kosciuczuk E, Hinkson C, Rebeiz T, Reitz S, King PH. Transgenic expression of HuR increases vasogenic edema and impedes functional recovery in rodent ischemic stroke. Neurosci Lett 2017; 661:126-131. [PMID: 28982595 DOI: 10.1016/j.neulet.2017.09.062] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 09/25/2017] [Accepted: 09/29/2017] [Indexed: 10/18/2022]
Abstract
BACKGROUND AND PURPOSE Ischemic stroke produces significant morbidity and mortality, and acute interventions are limited by short therapeutic windows. Novel approaches to neuroprotection and neurorepair are necessary. HuR is an RNA-binding protein (RBP) which modulates RNA stability and translational efficiency of genes linked to ischemic stroke injury. METHODS Using a transgenic (Tg) mouse model, we examined the impact of ectopic HuR expression in astrocytes on acute injury evolution after transient middle cerebral artery occlusion (tMCAO). RESULTS HuR transgene expression was detected in astrocytes in perilesional regions and contralaterally. HuR Tg mice did not improve neurologically 72h after injury, whereas littermate controls did. In Tg mice, increased cerebral vascular permeability and edema were observed. Infarct volume was not affected by the presence of the transgene. CONCLUSIONS Ectopic expression of HuR in astrocytes worsens outcome after transient ischemic stroke in mice in part by increasing vasogenic cerebral edema. These findings suggest that HuR could be a therapeutic target in cerebral ischemia/reperfusion.
Collapse
Affiliation(s)
- Agnieszka A Ardelt
- Department of Neurology, University of Chicago, 5841 S. Maryland Ave, MC2030, Chicago, IL 60637, United States.
| | - Randall S Carpenter
- Department of Neurology, University of Chicago, 5841 S. Maryland Ave, MC2030, Chicago, IL 60637, United States.
| | - Ifeanyi Iwuchukwu
- Department of Neurocritical Care, Ochsner Medical Center, 1514 Jefferson Hwy., New Orleans, LA 70121, United States.
| | - An Zhang
- Department of Neurology, University of Chicago, 5841 S. Maryland Ave, MC2030, Chicago, IL 60637, United States.
| | - William Lin
- Department of Neurology, University of Chicago, 5841 S. Maryland Ave, MC2030, Chicago, IL 60637, United States.
| | - Ewa Kosciuczuk
- Division of Hematology-Oncology, Northwestern University, 675 North St. Clair, Chicago, IL 60611, United States.
| | - Cyrus Hinkson
- Department of Neurology, University of Chicago, 5841 S. Maryland Ave, MC2030, Chicago, IL 60637, United States.
| | - Tania Rebeiz
- Department of Neurology, University of Chicago, 5841 S. Maryland Ave, MC2030, Chicago, IL 60637, United States.
| | - Sydney Reitz
- Department of Neurology, University of Chicago, 5841 S. Maryland Ave, MC2030, Chicago, IL 60637, United States.
| | - Peter H King
- Birmingham Veterans Affairs Medical Center, Birmingham, AL, United States.
| |
Collapse
|
22
|
Xia Y, Xia H, Chen D, Liao Z, Yan Y. Mechanisms of autophagy and apoptosis mediated by JAK2 signaling pathway after spinal cord injury of rats. Exp Ther Med 2017; 14:1589-1593. [PMID: 28781630 PMCID: PMC5526089 DOI: 10.3892/etm.2017.4674] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 05/04/2017] [Indexed: 01/01/2023] Open
Abstract
The aim of this study was to investigate the pathogenesis of autophagy and apoptosis mediated by Janus kinase 2/signal transducer and activator of transcription 3 (JAK2/STAT3) signal pathway after the onset of acute spinal cord injury (ASCI). A total of 45 Sprague-Dawley adult rats of either sex were selected for this study. The age of rats ranged from 8 to 10 weeks, and the average weight was 245 g. These rats were randomly divided into three groups, i.e. sham-operated group, model group, and the AG-490 intervention group (AG-490 is an inhibitor of JAK2). Each group contained 15 rats. Models were prepared using the modified Allen method. Five rats in each group were sacrificed at 6, 12 and 24 h, respectively, and the expression levels of p-JAK2 and p-STAT3 were detected in spinal cord tissue via western blot analysis. The levels of proinflammatory cytokines interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) were detected via ELISA, positive expression of light chain 3 (LC3)-II of microtubule-associated protein 1 via immunofluorescence labeling method, and mRNA expression levels of caspase-3 and Bax/Bcl-2 via RT-PCR. In the model group, the expression levels of p-JAK2, p-STAT3, IL-6, TNF-α and LC3-II, and the mRNA expression levels of caspase-3 and Bax/Bcl-2 at all time-points were significantly higher than those in the AG-490 intervention group, and the levels in the sham-operated group were the lowest (p<0.05). In the model group, peak levels of p-JAK2 and p-STAT3 were attained at 12 h, but a decline was seen at 24 h; while increasing trend was seen in other indicators. In conclusion, JAK2/STAT3 signal pathway can mediate the activity of autophagy and apoptosis in an early stage after the onset of ASCI of rat.
Collapse
Affiliation(s)
- Yongzhi Xia
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Haijian Xia
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Dan Chen
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Zhengbu Liao
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Yi Yan
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| |
Collapse
|
23
|
Astrocytic expression of the RNA regulator HuR accentuates spinal cord injury in the acute phase. Neurosci Lett 2017; 651:140-145. [DOI: 10.1016/j.neulet.2017.05.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 04/30/2017] [Accepted: 05/02/2017] [Indexed: 01/05/2023]
|