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Chen C, Lin HG, Yao Z, Jiang YL, Yu HJ, Fang J, Li WN. Transcription factor glucocorticoid modulatory element-binding protein 1 promotes hepatocellular carcinoma progression by activating Yes-associate protein 1. World J Gastrointest Oncol 2023; 15:988-1004. [PMID: 37389116 PMCID: PMC10302989 DOI: 10.4251/wjgo.v15.i6.988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 03/18/2023] [Accepted: 04/12/2023] [Indexed: 06/14/2023] Open
Abstract
BACKGROUND Glucocorticoid modulatory element-binding protein 1 (GMEB1), which has been identified as a transcription factor, is a protein widely expressed in various tissues. Reportedly, the dysregulation of GMEB1 is linked to the genesis and development of multiple cancers.
AIM To explore GMEB1’s biological functions in hepatocellular carcinoma (HCC) and figuring out the molecular mechanism.
METHODS GMEB1 expression in HCC tissues was analyzed employing the StarBase database. Immunohistochemical staining, Western blotting and quantitative real-time PCR were conducted to examine GMEB1 and Yes-associate protein 1 (YAP1) expression in HCC cells and tissues. Cell counting kit-8 assay, Transwell assay and flow cytometry were utilized to examine HCC cell proliferation, migration, invasion and apoptosis, respectively. The JASPAR database was employed for predicting the binding site of GMEB1 with YAP1 promoter. Dual-luciferase reporter gene assay and chromatin immunoprecipitation-qPCR were conducted to verify the binding relationship of GMEB1 with YAP1 promoter region.
RESULTS GMEB1 was up-regulated in HCC cells and tissues, and GMEB1 expression was correlated to the tumor size and TNM stage of HCC patients. GMEB1 overexpression facilitated HCC cell multiplication, migration, and invasion, and suppressed the apoptosis, whereas GMEB1 knockdown had the opposite effects. GMEB1 bound to YAP1 promoter region and positively regulated YAP1 expression in HCC cells.
CONCLUSION GMEB1 facilitates HCC malignant proliferation and metastasis by promoting the transcription of the YAP1 promoter region.
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Affiliation(s)
- Cheng Chen
- Department of Medical Oncology, Zhejiang Xiaoshan Hospital, Hangzhou 311202, Zhejiang Province, China
| | - Hai-Guan Lin
- Department of General Surgery, People’s Liberation Army Strategic Support Force Characteristic Medical Center, Beijing 100101, China
| | - Zheng Yao
- Department of Radiation Oncology, Cancer Hospital of The University of Chinese Academy of Sciences, Hangzhou 310022, Zhejiang Province, China
| | - Yi-Ling Jiang
- Department of Medical Oncology, Zhejiang Xiaoshan Hospital, Hangzhou 311202, Zhejiang Province, China
| | - Hong-Jin Yu
- Department of Medical Oncology, Zhejiang Xiaoshan Hospital, Hangzhou 311202, Zhejiang Province, China
| | - Jing Fang
- Department of Medical Oncology, Zhejiang Xiaoshan Hospital, Hangzhou 311202, Zhejiang Province, China
| | - Wei-Na Li
- Department of Medical Oncology, Zhejiang Xiaoshan Hospital, Hangzhou 311202, Zhejiang Province, China
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GMEB2 Promotes the Growth of Colorectal Cancer by Activating ADRM1 Transcription and NF-κB Signalling and Is Positively Regulated by the m 6A Reader YTHDF1. Cancers (Basel) 2022; 14:cancers14246046. [PMID: 36551532 PMCID: PMC9776391 DOI: 10.3390/cancers14246046] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 11/29/2022] [Accepted: 12/05/2022] [Indexed: 12/14/2022] Open
Abstract
Transcription factors are frequently aberrantly reactivated in various cancers, including colorectal cancer (CRC). However, as a transcription factor, the role of GMEB2 in cancer is still unclear, and further studies are needed. Here, we aimed to identify the function and mechanism of GMEB2 in regulating the malignant progression of CRC. GMEB2 was found to be highly expressed in online data analyses. We demonstrated that GMEB2 was markedly upregulated at both the mRNA and protein levels in CRC cells and tissues. GMEB2 knockdown inhibited CRC cell growth in vitro and in vivo. Mechanistically, as a transcription factor, GMEB2 transactivated the ADRM1 promoter to increase its transcription. Rescue experiments showed that ADRM1 downregulation partially reversed the promoting effects of GMEB2 on CRC growth in vitro. Moreover, the GMEB2/ADRM1 axis induced nuclear translocation of NF-κB, thus activating NF-κB signalling. Finally, we further revealed that YTHDF1 recognized and bound to the m6A site on GMEB2 mRNA, which enhanced its stability. Taken together, our findings reveal the crucial role and regulatory mechanism of GMEB2 in CRC for the first time and provide a novel potential therapeutic target for CRC therapy.
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Xiong L, Chen L, Wu L, He W, Chen D, Peng Z, Li J, Zhu X, Su L, Li Y, Gong Y, Xiao H. Lipotoxicity-induced circGlis3 impairs beta cell function and is transmitted by exosomes to promote islet endothelial cell dysfunction. Diabetologia 2022; 65:188-205. [PMID: 34751796 DOI: 10.1007/s00125-021-05591-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Accepted: 07/30/2021] [Indexed: 11/26/2022]
Abstract
AIMS/HYPOTHESIS Lipotoxicity constitutes the major driving force for type 2 diabetes. Circular RNAs (circRNAs) play important roles in regulating beta cell function and exosomes are essential mediators of intercellular communication. The role of exosomal circRNAs in type 2 diabetes remains largely unknown. We aimed to examine whether lipotoxicity induces dysregulation of circRNAs in beta cell-derived exosomes and to determine the contribution of exosomal circRNAs to the development of type 2 diabetes. METHODS Exosomes were extracted from MIN6 cells treated with palmitate or BSA, and RNA sequencing was performed. CircGlis3 (Gli-similar 3) expression level was validated by qPCR. The impact of circGlis3 on beta cell function and the deleterious effects of exosomal circGlis3 on islet endothelial cells (islet ECs) were investigated in vitro and in vivo in human and mouse models by gain or loss of function assays. The molecular mechanism of circGlis3 was explored by RNA pull-down and immunoprecipitation assays. RESULTS Beta cell-derived exosomal circGlis3 was significantly upregulated under lipotoxic conditions, and exosomal circGlis3 levels were also elevated in the serum of mouse models of diabetes and participants with type 2 diabetes. CircGlis3 participated in lipotoxicity-induced beta cell dysfunction in vitro and in vivo. Moreover, beta cell-derived exosomal circGlis3 could be transferred to islet ECs and reduce the cell viability, cell migration and angiogenesis of islet ECs. Mechanistically, circGlis3 promoted the degradation of glucocorticoid modulatory element-binding protein 1 (GMEB1) by facilitating the interaction between GMEB1 and mindbomb E3 ubiquitin protein ligase 2 (MIB2), thus suppressing the phosphorylation of heat shock protein 27 (HSP27). CONCLUSIONS/INTERPRETATION Our study points to the involvement of circGlis3 in diabetes development, and exosomal circGlis3 transfer as a communication mode between beta cells and islet ECs, suggesting that circGlis3 might be a potential biomarker and therapeutic target for type 2 diabetes. DATA AVAILABILITY The RNA-sequencing data have been deposited in the NCBI Sequence Read Archive (SRA) database, with accession number PRJNA689673. Mass spectrometry data are available via ProteomeXchange with identifier PXD024693.
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Affiliation(s)
- Li Xiong
- Department of Endocrinology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Li Chen
- Department of Endocrinology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Liting Wu
- Department of Endocrinology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Weiman He
- Department of Endocrinology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Dubo Chen
- Department of Clinical Laboratory, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Zishan Peng
- Department of Endocrinology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Jin Li
- Department of Endocrinology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
- Department of Geriatrics, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Xiaonan Zhu
- Department of Pharmacology, Zhong‑Shan School of Medicine, Sun Yat‑sen University, Guangzhou, Guangdong, China
| | - Lei Su
- Department of Endocrinology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
- Department of Geriatrics, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Yanbing Li
- Department of Endocrinology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Yingying Gong
- Department of Endocrinology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
- Department of Geriatrics, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
| | - Haipeng Xiao
- Department of Endocrinology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China.
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Kotsaris G, Kerselidou D, Koutsoubaris D, Constantinou E, Malamas G, Garyfallos DA, Ηatzivassiliou EG. TRAF3 can interact with GMEB1 and modulate its anti-apoptotic function. ACTA ACUST UNITED AC 2020; 27:7. [PMID: 32514408 PMCID: PMC7257233 DOI: 10.1186/s40709-020-00117-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 05/16/2020] [Indexed: 11/17/2022]
Abstract
Background Members of Tumor Necrosis Factor (TNF) Receptor-Associated Factors (TRAFs) family interact with the cytoplasmic tails of TNF receptor family members to mediate signal transduction processes. TRAF3 has a major immunomodulatory function and TRAF3 deficiency has been linked to malignancies, such as multiple myeloma and lymphoid defects. In order to characterize the molecular mechanisms of TRAF3 signaling, the yeast two-hybrid system was used to identify proteins that interact with TRAF3. Results The yeast two-hybrid screen of a human B cell cDNA library with TRAF3 as bait, identified Glucocorticoid Modulatory Element-Binding Protein 1 (GMEB1) as a TRAF3-interacting protein. Previous studies indicated that GMEB1 functions as a potent inhibitor of caspase activation and apoptosis. The interaction of TRAF3 and GMEB1 proteins was confirmed in mammalian cells lines, using immunoprecipitation assays. The RING and TRAF-C domains of TRAF3 were not essential for this interaction. The overexpression of TRAF3 protein enhanced the anti-apoptotic function of GMEB1 in HeLa cells. On the other hand, downregulation of TRAF3 by RNA interference decreased significantly the ability of GMEB1 to inhibit apoptosis. In addition, LMP1(1–231), a truncated form of the EBV oncoprotein LMP1, that can interact and oligomerize with TRAF3, was also able to cooperate with GMEB1, in order to inhibit apoptosis. Conclusions Our protein-interaction experiments demonstrated that TRAF3 can interact with GMEB1, which is an inhibitor of apoptosis. In addition, cell viability assays showed that overexpression of TRAF3 enhanced the anti-apoptotic activity of GMEB1, supporting a regulatory role of TRAF3 in GMEB1-mediated inhibition of apoptosis. Better understanding of the molecular mechanism of TRAF3 function will improve diagnostics and targeted therapeutic approaches for TRAF3-associated disorders.
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Affiliation(s)
- George Kotsaris
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Macedonia Greece.,Present Address: Institute for Chemistry and Biochemistry, Freie Universität Berlin, Thielallee 63, 14195 Berlin, Germany
| | - Despoina Kerselidou
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Macedonia Greece.,Present Address: Université de Liège, Place du 20-Août, 7 B, 4000 Liège, Belgium
| | - Dimitrios Koutsoubaris
- Department of Medicine, School of Health Sciences, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Macedonia Greece
| | - Elena Constantinou
- Department of Medicine, School of Health Sciences, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Macedonia Greece
| | - George Malamas
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Macedonia Greece
| | - Dimitrios A Garyfallos
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Macedonia Greece.,Present Address: Wellcome Trust Sanger Institute, Genome Campus, Hinxton, Cambridgeshire, CB10 1SA UK
| | - Eudoxia G Ηatzivassiliou
- Department of Medicine, School of Health Sciences, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Macedonia Greece
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In vivo nuclear capture and molecular profiling identifies Gmeb1 as a transcriptional regulator essential for dopamine neuron function. Nat Commun 2019; 10:2508. [PMID: 31175277 PMCID: PMC6555850 DOI: 10.1038/s41467-019-10267-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 04/26/2019] [Indexed: 11/08/2022] Open
Abstract
Midbrain dopamine (mDA) neurons play a central role in reward signaling and are widely implicated in psychiatric and neurodegenerative disorders. To understand how mDA neurons perform these functions, it is important to understand how mDA-specific genes are regulated. However, cellular heterogeneity in the mammalian brain presents a major challenge to obtaining this understanding. To this end, we developed a virus-based approach to label and capture mDA nuclei for transcriptome (RNA-Seq), and low-input chromatin accessibility (liDNase-Seq) profiling, followed by predictive modeling to identify putative transcriptional regulators of mDA neurons. Using this method, we identified Gmeb1, a transcription factor predicted to regulate expression of Th and Dat, genes critical for dopamine synthesis and reuptake, respectively. Gmeb1 knockdown in mDA neurons resulted in downregulation of Th and Dat, as well as in severe motor deficits. This study thus identifies Gmeb1 as a master regulator of mDA gene expression and function, and provides a general method for identifying cell type-specific transcriptional regulators.
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Glucocorticoid modulatory element-binding protein 1 (GMEB1) interacts with the de-ubiquitinase USP40 to stabilize CFLAR L and inhibit apoptosis in human non-small cell lung cancer cells. J Exp Clin Cancer Res 2019; 38:181. [PMID: 31046799 PMCID: PMC6498657 DOI: 10.1186/s13046-019-1182-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 04/17/2019] [Indexed: 02/05/2023] Open
Abstract
Background GMEB1 was originally identified via its interaction with GMEB2, which binds to the promoter region of the tyrosine aminotransferase (TAT) gene and modulates transactivation of the glucocorticoid receptor gene. In the cytosol, GMEB1 interacts with and inhibits CASP8, but the molecular mechanism is currently unknown. Methods Human non-small cell lung cancer cells and 293FT cells were used to investigate the function of GMEB1/USP40/CFLARL complex by WB, GST Pull-Down Assay, Immunoprecipitation, Immunofluorescence and Flow cytometry analysis. A549 cells overexpressing green fluorescent protein and GMEB1 shRNA were used for tumor xenograft using female athymic nu/nu 4-week-old mice. Results We found GMEB1 interacted with CFLARL (also known as c-FLIPL) in the cytosol and promoted its stability. USP40 targeted CFLARL for K48-linked de-ubiquitination. GMEB1 promoted the binding of USP40 to CFLARL. USP40 knockdown did not increase CFLARL protein level despite GMEB1 overexpression, suggesting GMEB1 promotes CFLARL stability via USP40. Additionally, GMEB1 inhibited the activation of pro-caspase 8 and apoptosis in non-small cell lung cancer (NSCLC) cell via CFLARL stabilization. Also, GMEB1 inhibited the formation of DISC upon TRAIL activation. CFLARL enhanced the binding of GMEB1 and CASP8. Downregulation of GMEB1 inhibited A549 xenograft tumor growth in vivo. Conclusions Our findings show the de-ubiquitinase USP40 regulates the ubiquitination and degradation of CFLARL; and GMEB1 acts as a bridge protein for USP40 and CFLARL. Mechanistically, we found GMEB1 inhibits the activation of CASP8 by modulating ubiquitination and degradation of CFLARL. These findings suggest a novel strategy to induce apoptosis through CFLARL targeting in human NSCLC cells. Electronic supplementary material The online version of this article (10.1186/s13046-019-1182-3) contains supplementary material, which is available to authorized users.
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Liu Y, Eaton ED, Wills TE, McCann SK, Antonic A, Howells DW. Human Ischaemic Cascade Studies Using SH-SY5Y Cells: a Systematic Review and Meta-Analysis. Transl Stroke Res 2018; 9:564-574. [PMID: 29572690 PMCID: PMC6208743 DOI: 10.1007/s12975-018-0620-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/03/2018] [Accepted: 03/06/2018] [Indexed: 01/21/2023]
Abstract
Low translational yield for stroke may reflect the focus of discovery science on rodents rather than humans. Just how little is known about human neuronal ischaemic responses is confirmed by systematic review and meta-analysis revealing that data for the most commonly used SH-SY5Y human cells comprises only 84 papers. Oxygen-glucose deprivation, H2O2, hypoxia, glucose-deprivation and glutamate excitotoxicity yielded - 58, - 61, - 29, - 45 and - 49% injury, respectively, with a dose-response relationship found only for H2O2 injury (R2 = 29.29%, p < 0.002). Heterogeneity (I2 = 99.36%, df = 132, p < 0.0001) was largely attributable to the methods used to detect injury (R2 = 44.77%, p < 0.000) with cell death assays detecting greater injury than survival assays (- 71 vs - 47%, R2 = 28.64%, p < 0.000). Seventy-four percent of publications provided no description of differentiation status, but in the 26% that did, undifferentiated cells were susceptible to greater injury (R2 = 4.13%, p < 0.047). One hundred and sixty-nine interventions improved average survival by 34.67% (p < 0.0001). Eighty-eight comparisons using oxygen-glucose deprivation found both benefit and harm, but studies using glutamate and H2O2 injury reported only improvement. In studies using glucose deprivation, intervention generally worsened outcome. There was insufficient data to rank individual interventions, but of the studies reporting greatest improvement (> 90% effect size), 7/13 were of herbal medicine constituents (24.85% of the intervention dataset). We conclude that surprisingly little is known of the human neuronal response to ischaemic injury, and that the large impact of methodology on outcome indicates that further model validation is required. Lack of evidence for randomisation, blinding or power analysis suggests that the intervention data is at substantial risk of bias.
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Affiliation(s)
- Ye Liu
- The Florey Institute of Neuroscience and Mental Health, 30 Royal Parade, The University of Melbourne, Melbourne, VIC, 3052, Australia
| | - Emma D Eaton
- School of Medicine, Faculty of Health, University of Tasmania, Medical Sciences Precinct, 17 Liverpool Street, Hobart, TAS, 7000, Australia
| | - Taryn E Wills
- Melbourne Brain Centre, Florey Institute of Neuroscience and Mental Health, 245 Burgundy St, Heidelberg, VIC, 3084, Australia
| | - Sarah K McCann
- Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, EH16 4SB, UK
| | - Ana Antonic
- Department of Neuroscience, Monash University, Melbourne, VIC, 3004, Australia
| | - David W Howells
- School of Medicine, Faculty of Health, University of Tasmania, Medical Sciences Precinct, 17 Liverpool Street, Hobart, TAS, 7000, Australia.
- School of Medicine, Faculty of Health, University of Tasmania, Medical Sciences Precinct, 17 Liverpool Street, Hobart, TAS, 7000, Australia.
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Hiraoka H, Nakahara K, Kaneko Y, Akiyama S, Okuda K, Iwawaki T, Fujimura M, Kumagai Y, Takasugi N, Uehara T. Modulation of Unfolded Protein Response by Methylmercury. Biol Pharm Bull 2018; 40:1595-1598. [PMID: 28867746 DOI: 10.1248/bpb.b17-00359] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Methylmercury (MeHg) results in cell death through endoplasmic reticulum (ER) stress. Previously, we reported that MeHg induces S-mercuration at cysteine 383 or 386 in protein disulfide isomerase (PDI), and this modification induces the loss of enzymatic activity. Because PDI is a key enzyme for the maturation of nascent protein harboring a disulfide bond, the disruption in PDI function by MeHg results in ER stress via the accumulation of misfolded proteins. However, the effects of MeHg on unfolded protein response (UPR) sensors and their signaling remain unclear. In the present study, we show that UPR is regulated by MeHg. We found that MeHg specifically attenuated inositol-requiring enzyme 1α (IRE1α)-x-box binding protein 1 (XBP1) branch, but not the protein kinase RNA-like endoplasmic reticulum kinase (PERK) and activating transcriptional factor 6 (ATF6) branches. Treatment with GSK2606414, a specific PERK inhibitor, significantly inhibited MeHg-induced cell death. These findings suggest that MeHg exquisitely regulates UPR signaling involved in cell death.
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Affiliation(s)
- Hideki Hiraoka
- Department of Medicinal Pharmacology, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University
| | - Kengo Nakahara
- Department of Medicinal Pharmacology, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University
| | - Yuki Kaneko
- Department of Medicinal Pharmacology, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University
| | - Shiori Akiyama
- Department of Medicinal Pharmacology, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University
| | - Kosaku Okuda
- Department of Medicinal Pharmacology, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University
| | - Takao Iwawaki
- Division of Cell Medicine, Department of Life Science, Medical Research Institute, Kanazawa Medical University
| | - Masatake Fujimura
- Department of Basic Medical Sciences, National Institute for Minamata Disease
| | | | - Nobumasa Takasugi
- Department of Medicinal Pharmacology, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University
| | - Takashi Uehara
- Department of Medicinal Pharmacology, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University
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Wang CF, Zhao CC, Weng WJ, Lei J, Lin Y, Mao Q, Gao GY, Feng JF, Jiang JY. Alteration in Long Non-Coding RNA Expression after Traumatic Brain Injury in Rats. J Neurotrauma 2017; 34:2100-2108. [PMID: 28145813 DOI: 10.1089/neu.2016.4642] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- Chuan-fang Wang
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People's Republic of China
- Shanghai Institute of Head Trauma, Shanghai, People's Republic of China
| | - Cheng-cheng Zhao
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People's Republic of China
- Shanghai Institute of Head Trauma, Shanghai, People's Republic of China
| | - Wei-ji Weng
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Jin Lei
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Yong Lin
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People's Republic of China
- Shanghai Institute of Head Trauma, Shanghai, People's Republic of China
| | - Qing Mao
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Guo-yi Gao
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People's Republic of China
- Shanghai Institute of Head Trauma, Shanghai, People's Republic of China
| | - Jun-feng Feng
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People's Republic of China
- Shanghai Institute of Head Trauma, Shanghai, People's Republic of China
| | - Ji-yao Jiang
- Department of Neurosurgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People's Republic of China
- Shanghai Institute of Head Trauma, Shanghai, People's Republic of China
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Wei L, Lv S, Huang Q, Wei J, Zhang S, Huang R, Lu Z, Lin X. Pratensein attenuates Aβ-induced cognitive deficits in rats: Enhancement of synaptic plasticity and cholinergic function. Fitoterapia 2015; 101:208-17. [DOI: 10.1016/j.fitote.2015.01.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Revised: 01/24/2015] [Accepted: 01/30/2015] [Indexed: 12/11/2022]
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Endogenous S-sulfhydration of PTEN helps protect against modification by nitric oxide. Biochem Biophys Res Commun 2014; 456:245-9. [PMID: 25446078 DOI: 10.1016/j.bbrc.2014.11.066] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 11/17/2014] [Indexed: 01/09/2023]
Abstract
Hydrogen sulfide (H2S) is a gaseous regulatory factor produced by several enzymes, and plays a pivotal role in processes such as proliferation or vasodilation. Recent reports demonstrated the physiological and pathophysiological functions of H2S in neurons. PTEN is a target of nitric oxide (NO) or hydrogen peroxide, and the oxidative modification of cysteine (Cys) residue(s) attenuates its enzymatic activity. In the present study, we assessed the effect of H2S on the direct modification of PTEN and the resulting downstream signaling. A modified biotin switch assay in SH-SY5Y human neuroblastoma cells revealed that PTEN is S-sulfhydrated endogenously. Subsequently, site-directed mutagenesis demonstrated that both Cys71 and Cys124 in PTEN are targets for S-sulfhydration. Further, the knockdown of cystathionine β-synthetase (CBS) using siRNA decreased this modification in a manner that was correlated to amount of H2S. PTEN was more sensitive to NO under these conditions. These results suggest that the endogenous S-sulfhydration of PTEN via CBS/H2S plays a role in preventing the S-nitrosylation that would inhibition its enzymatic activity under physiological conditions.
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CHEN FANGYUAN, CAO LANFANG, WAN HAIXIA, ZHANG MINYUE, CAI JIAYI, SHEN LIJING, ZHONG JIHUA, ZHONG HUA. Quercetin enhances adriamycin cytotoxicity through induction of apoptosis and regulation of mitogen-activated protein kinase/extracellular signal-regulated kinase/c-Jun N-terminal kinase signaling in multidrug-resistant leukemia K562 cells. Mol Med Rep 2014; 11:341-8. [DOI: 10.3892/mmr.2014.2734] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Accepted: 09/29/2014] [Indexed: 11/05/2022] Open
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Makino K, Okuda K, Sugino E, Nishiya T, Toyama T, Iwawaki T, Fujimura M, Kumagai Y, Uehara T. Correlation Between Attenuation of Protein Disulfide Isomerase Activity Through S-Mercuration and Neurotoxicity Induced by Methylmercury. Neurotox Res 2014; 27:99-105. [DOI: 10.1007/s12640-014-9494-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Revised: 09/22/2014] [Accepted: 09/29/2014] [Indexed: 10/24/2022]
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Tang Y, Wang J, Lin X, Wang L, Shao B, Jin K, Wang Y, Yang GY. Neural stem cell protects aged rat brain from ischemia-reperfusion injury through neurogenesis and angiogenesis. J Cereb Blood Flow Metab 2014; 34:1138-47. [PMID: 24714034 PMCID: PMC4083376 DOI: 10.1038/jcbfm.2014.61] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 03/04/2014] [Accepted: 03/05/2014] [Indexed: 12/28/2022]
Abstract
Neural stem cells (NSCs) show therapeutic potential for ischemia in young-adult animals. However, the effect of aging on NSC therapy is largely unknown. In this work, NSCs were transplanted into aged (24-month-old) and young-adult (3-month-old) rats at 1 day after stroke. Infarct volume and neurobehavioral outcomes were examined. The number of differentiated NSCs was compared in aged and young-adult ischemic rats and angiogenesis and neurogenesis were also determined. We found that aged rats developed larger infarcts than young-adult rats after ischemia (P<0.05). The neurobehavioral outcome was also worse for aged rats comparing with young-adult rats. Brain infarction and neurologic deficits were attenuated after NSC transplantation in both aged and young-adult rats. The number of survived NSCs in aged rats was similar to that of the young-adult rats (P>0.05) and most of them were differentiated into glial fibrillary acidic protein(+) (GFAP(+)) cells. More importantly, angiogenesis and neurogenesis were greatly enhanced in both aged and young-adult rats after transplantation compared with phosphate-buffered saline (PBS) control (P<0.05), accompanied by increased expression of vascular endothelial growth factor (VEGF). Our results showed that NSC therapy reduced ischemic brain injury, along with increased angiogenesis and neurogenesis in aged rats, suggesting that aging-related microenvironment does not preclude a beneficial response to NSCs transplantation during cerebral ischemia.
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Affiliation(s)
- Yaohui Tang
- Neuroscience and Neuroengineering Center, Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, China
| | - Jixian Wang
- Department of Neurology, Shanghai Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Xiaojie Lin
- Neuroscience and Neuroengineering Center, Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, China
| | - Liuqing Wang
- Zhejiang Provincial Key Laboratory of Aging and Neurological Disorder Research the First Affiliated Hospital, Department of Neurology, Wenzhou Medical College, Zhejiang, China
| | - Bei Shao
- Zhejiang Provincial Key Laboratory of Aging and Neurological Disorder Research the First Affiliated Hospital, Department of Neurology, Wenzhou Medical College, Zhejiang, China
| | - Kunlin Jin
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, Texas, USA
| | - Yongting Wang
- Neuroscience and Neuroengineering Center, Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, China
| | - Guo-Yuan Yang
- 1] Neuroscience and Neuroengineering Center, Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, China [2] Department of Neurology, Shanghai Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
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Yin Y, Ren Y, Wu W, Wang Y, Cao M, Zhu Z, Wang M, Li W. Protective effects of bilobalide on Aβ25–35 induced learning and memory impairments in male rats. Pharmacol Biochem Behav 2013; 106:77-84. [DOI: 10.1016/j.pbb.2013.03.005] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 02/26/2013] [Accepted: 03/14/2013] [Indexed: 01/02/2023]
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Kominami K, Nakabayashi J, Nagai T, Tsujimura Y, Chiba K, Kimura H, Miyawaki A, Sawasaki T, Yokota H, Manabe N, Sakamaki K. The molecular mechanism of apoptosis upon caspase-8 activation: quantitative experimental validation of a mathematical model. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2012; 1823:1825-40. [PMID: 22801217 DOI: 10.1016/j.bbamcr.2012.07.003] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Revised: 06/29/2012] [Accepted: 07/06/2012] [Indexed: 12/22/2022]
Abstract
Caspase-8 (CASP8) is a cysteine protease that plays a pivotal role in the extrinsic apoptotic signaling pathway via death receptors. The kinetics, dynamics, and selectivity with which the pathway transmits apoptotic signals to downstream molecules upon CASP8 activation are not fully understood. We have developed a system for using high-sensitivity FRET-based biosensors to monitor the protease activity of CASP8 and its downstream effector, caspase-3, in living single cells. Using this system, we systematically investigated the caspase cascade by regulating the magnitude of extrinsic signals received by the cell. Furthermore, we determined the molar concentration of five caspases and Bid required for hierarchical transmission of apoptotic signals in a HeLa cell. Based on these quantitative experimental data, we validated a mathematical model suitable for estimation of the kinetics and dynamics of caspases, which predicts the minimal concentration of CASP8 required to act as an initiator. Consequently, we found that less than 1% of the total CASP8 proteins are sufficient to set the apoptotic program in motion if activated. Taken together, our findings demonstrate the precise cascade of CASP8-mediated apoptotic signals through the extrinsic pathway.
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Affiliation(s)
- Katsuya Kominami
- Department of Animal Development and Physiology, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
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Donnenfeld ED, Holland EJ, Solomon KD, Fiore J, Gobbo A, Prince J, Sandoval HP, Shull ER, Perry HD. A multicenter randomized controlled fellow eye trial of pulse-dosed difluprednate 0.05% versus prednisolone acetate 1% in cataract surgery. Am J Ophthalmol 2011; 152:609-617.e1. [PMID: 21704965 DOI: 10.1016/j.ajo.2011.03.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2011] [Revised: 03/09/2011] [Accepted: 03/10/2011] [Indexed: 10/18/2022]
Abstract
PURPOSE To compare the effects of 2 corticosteroids on corneal thickness and visual acuity after cataract surgery. DESIGN Multicenter, randomized, contralateral-eye, double-masked trial. METHODS Fifty-two patients (104 eyes) underwent bilateral phacoemulsification. The first eye randomly received difluprednate 0.05% or prednisolone acetate 1%; the fellow eye received the alternative. Before surgery, 7 doses were administered over 2 hours; 3 additional doses were given after surgery, before discharge. For the remainder of the day, corticosteroids were administered every 2 hours, then 4 times daily during week 1 and twice daily during week 2. Corneal pachymetry, visual acuity, and corneal edema were evaluated before surgery and at days 1, 15, and 30 after surgery. Endothelial cell counts were evaluated before surgery and at 30 days after surgery. Retinal thickness was evaluated before surgery and at 15 and 30 days after surgery. RESULTS Corneal thickness at day 1 was 33 μm less in difluprednate-treated eyes (P = .026). More eyes were without corneal edema in the difluprednate group than in the prednisolone group at day 1 (62% vs 38%, respectively; P = .019). Uncorrected and best-corrected visual acuity at day 1 were significantly better with difluprednate than prednisolone by 0.093 logMAR lines (P = .041) and 0.134 logMAR lines (P < .001), respectively. Endothelial cell density was 195.52 cells/mm(2) higher in difluprednate-treated eyes at day 30 (P < .001). Retinal thickness at day 15 was 7.74 μm less in difluprednate-treated eyes (P = .011). CONCLUSIONS In this high-dose pulsed-therapy regimen, difluprednate reduced inflammation more effectively than prednisolone acetate, resulting in more rapid return of vision. Difluprednate was superior at protecting the cornea and reducing macular thickening after cataract surgery.
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Uchibayashi R, Tsuruma K, Inokuchi Y, Shimazawa M, Hara H. Involvement of Bid and caspase-2 in endoplasmic reticulum stress- and oxidative stress-induced retinal ganglion cell death. J Neurosci Res 2011; 89:1783-94. [DOI: 10.1002/jnr.22691] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Revised: 04/12/2011] [Accepted: 04/14/2011] [Indexed: 12/22/2022]
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Kawabe K, Lindsay D, Braitch M, Fahey AJ, Showe L, Constantinescu CS. IL-12 inhibits glucocorticoid-induced T cell apoptosis by inducing GMEB1 and activating PI3K/Akt pathway. Immunobiology 2011; 217:118-23. [PMID: 21840619 DOI: 10.1016/j.imbio.2011.07.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Accepted: 07/16/2011] [Indexed: 12/26/2022]
Abstract
Interleukin (IL)-12 is an important pro-inflammatory cytokine that has been shown to play a role in T cell survival, at least in part by activating the PI3K/Akt pathway. Glucocorticoid modulatory element binding protein (GMEB)1 and 2 are closely related proteins that modify the glucocorticoid receptor binding locus and thus modulate glucocorticoid-mediated gene induction effects, including apoptosis. GMEB1 associates with caspases and prevents apoptosis of cells in the nervous system. We have observed, in preliminary studies, that IL-12 up-regulates GMEB mRNA in human T cells, and postulated that this may contribute to the anti-apoptotic effect of IL-12 on T cells, in particular with regard to glucocorticoid induced apoptosis. Here, we confirm that IL-12 rescue of dexamethasone induced T cell apoptosis involves the PI3K/Akt pathway and that IL-12 induces GMEB1 and GMEB2. A siRNA knockdown of GMEB1 reverses the protective effect of IL-12 on dexamethasone induced T cell apoptosis. Thus, IL-12 protects T cells from glucocorticoid induced apoptosis via PI3K/Akt pathway and via induction of GMEB1, which is likely to reduce transactivation of the glucocorticoid receptor and induction of apoptotic genes. As glucocorticoid induced apoptosis occurs both in physiological and pathological/therapeutic situations, and IL-12 is actively involved in a variety of inflammatory and immune responses, the ability of IL-12 to inhibit steroid responses and increase T cell survival through GMEB1 has wide ranging implications. Manipulating GMEB may be used therapeutically to enhance the resistance or the sensitivity to steroids.
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Affiliation(s)
- Kiyokazu Kawabe
- Division of Clinical Neurology, University of Nottingham, United Kingdom
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Yamauchi M, Tsuruma K, Imai S, Nakanishi T, Umigai N, Shimazawa M, Hara H. Crocetin prevents retinal degeneration induced by oxidative and endoplasmic reticulum stresses via inhibition of caspase activity. Eur J Pharmacol 2010; 650:110-9. [PMID: 20951131 DOI: 10.1016/j.ejphar.2010.09.081] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2010] [Revised: 09/17/2010] [Accepted: 09/30/2010] [Indexed: 02/01/2023]
Abstract
Crocetin is a carotenoid that is the aglicone of crocin, which are found in saffron stigmas (Crocus sativus L.) and gardenia fruit (Gardenia jasminoides Ellis). In this study, we investigated the effects of crocetin on retinal damage. To examine whether crocetin affects stress pathways, we investigated intracellular oxidation induced by reactive oxygen species, expression of endoplasmic reticulum (ER) stress-related proteins, disruption of the mitochondrial membrane potential (ΔΨ(m)), and caspases activation. In vitro, we employed cultured retinal ganglion cells (RGC-5, a mouse ganglion cell-line transformed using E1A virus). Cell damage was induced by tunicamycin or hydrogen peroxide (H(2)O(2)) exposure. Crocetin at a concentration of 3μM showed the inhibitory effect of 50-60% against tunicamycin- and H(2)O(2)-induced cell death and inhibited increase in caspase-3 and -9 activity. Moreover, crocetin inhibited the enzymatic activity of caspase-9 in a cell-free system. In vivo, retinal damage in mice was induced by exposure to white light at 8000lx for 3h after dark adaptation. Photoreceptor damage was evaluated by measuring the outer nuclear layer thickness at 5days after light exposure and recording the electroretinogram (ERG). Retinal cell damage was also detected with Terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) staining at 48h after light exposure. Crocetin at 100mg/kg, p.o. significantly inhibited photoreceptor degeneration and retinal dysfunction and halved the expression of TUNEL-positive cells. These results indicate that crocetin has protective effects against retinal damage in vitro and in vivo, suggesting that the mechanism may inhibit increase in caspase-3 and -9 activities after retinal damage.
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Affiliation(s)
- Mika Yamauchi
- Department of Biofunctional Evaluation, Molecular Pharmacology, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
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D'Inca R, Kloareg M, Gras-Le Guen C, Le Huërou-Luron I. Intrauterine growth restriction modifies the developmental pattern of intestinal structure, transcriptomic profile, and bacterial colonization in neonatal pigs. J Nutr 2010; 140:925-31. [PMID: 20335628 DOI: 10.3945/jn.109.116822] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Neonates with intrauterine growth restriction (IUGR) are prone to suffer from digestive diseases. Using neonatal pigs with IUGR, we tested the hypothesis that IUGR may induce alterations in the developmental pattern of intestinal barrier and thereby may be responsible for IUGR-associated increased morbidity. Piglets with a birth weight near the mean birth weight (+/-0.5 SD) were identified as normal birth weight (control) and piglets with a mean -2 SD lower birth weight (-30%) were defined as piglets with IUGR. The developmental pattern of intestinal structure, transcriptomic profile, and bacterial colonization was investigated from birth to d 5 postnatal. At birth, intestinal weight and length, ileal and colonic weight per unit of length, and villous sizes were lower (P < 0.05) in piglets with IUGR than in same-age control piglets. These IUGR-induced intestinal alterations further persisted, although they were less marked at d 5. Counts of adherent bacteria to ileal and colonic mucosa were greater (P < 0.05) in 2-d-old piglets with IUGR than in same-age control piglets. Dynamic analyses of the transcriptomic profile of the intestine revealed molecular evidence of IUGR-induced intestinal growth impairment that may result from a change in the cell proliferation-apoptosis balance during the first days of life, while a protective process would occur later on. In addition, changes in the expression of several genes suggest a pivotal role of both glucocorticoids and microbiota in driving IUGR intestinal development during the neonatal period.
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Pasikowski P, Cydzik M, Kluczyk A, Stefanowicz P, Szewczuk Z. Ubiquitin fragments: their known biological activities and putative roles. Biomol Concepts 2010; 1:67-83. [PMID: 25961987 DOI: 10.1515/bmc.2010.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Ubiquitin (Ub) is involved in many key processes of cell biology. Identification of compounds that could interfere in the ubiquitination process is of importance. It could be expected that peptides derived from the Ub-binding regions might be able to interact with Ub receptors themselves and modify an ability of the Ub receptors interactions. This review summarizes current knowledge about known Ub-derived peptides and discusses putative activity of unexplored Ub fragments. Among identified biologically active Ub-derived peptides, its decapeptide fragment of the LEDGRTLSDY sequence was found to exhibit strong immunosuppressive effects on the cellular and humoral immune responses, comparable to that of cyclosporine. Some of the Ub fragments possess strong antibacterial and antifungal potency. In the search for new peptides that could interfere in the interaction of Ub with other proteins, we investigated the pentapeptide Ub sequences present in non-ubiquitin proteins. Based on examination of the Swiss-Prot database, we postulated that sequences of some Ub fragments often exist in other protein molecules. However, some of those motives are represented more frequently than others and could be involved in regulation of cellular processes related to Ub.
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Haase G, Pettmann B, Raoul C, Henderson CE. Signaling by death receptors in the nervous system. Curr Opin Neurobiol 2009; 18:284-91. [PMID: 18725296 DOI: 10.1016/j.conb.2008.07.013] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2008] [Accepted: 07/21/2008] [Indexed: 12/12/2022]
Abstract
Cell death plays an important role both in shaping the developing nervous system and in neurological disease and traumatic injury. In spite of their name, death receptors can trigger either cell death or survival and growth. Recent studies implicate five death receptors--Fas/CD95, TNFR1 (tumor necrosis factor receptor-1), p75NTR (p75 neurotrophin receptor), DR4, and DR5 (death receptors-4 and -5)--in different aspects of neural development or degeneration. Their roles may be neuroprotective in models of Parkinson's disease, or pro-apoptotic in ALS and stroke. Such different outcomes probably reflect the diversity of transcriptional and posttranslational signaling pathways downstream of death receptors in neurons and glia.
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Affiliation(s)
- Georg Haase
- Developmental Biology Institute of Marseille-Luminy, IBDML, CNRS UMR 6216, Marseille Cedex 09, France
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Wang YQ, Puntenney SB, Burton JL, Forsberg NE. Use of gene profiling to evaluate the effects of a feed additive on immune function in periparturient dairy cattle. J Anim Physiol Anim Nutr (Berl) 2009; 93:66-75. [DOI: 10.1111/j.1439-0396.2007.00780.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Nakagawa T, Tsuruma K, Uehara T, Nomura Y. GMEB1, a novel endogenous caspase inhibitor, prevents hypoxia- and oxidative stress-induced neuronal apoptosis. Neurosci Lett 2008; 438:34-7. [PMID: 18455874 DOI: 10.1016/j.neulet.2008.04.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2008] [Revised: 04/07/2008] [Accepted: 04/08/2008] [Indexed: 11/29/2022]
Abstract
The interaction of glucocorticoid modulatory element-binding protein 1 (GMEB1) with procaspase-2, -8, or -9 prevents caspase oligomerization and maturation. In the present study, we examined the effect of GMEB1 on neuronal apoptosis induced by hypoxia and oxidative stress. GMEB1 effectively attenuated caspase activation and apoptosis caused by these stresses in human neuroblastoma SK-N-MC cells, indicating that it functions as a potent inhibitor of caspase activation and apoptosis in response to oxidative stress. We propose that GMEB1 blocks pro-apoptosis signals induced by a variety of stresses.
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Affiliation(s)
- Tadashi Nakagawa
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
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