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Liang F, Jin J, Li Q, Duan J, Jiang A, Chen X, Geng H, Wu K, Yu F, Zhao X, Zhou Y, Hu D, Chen L. DOT1L/H3K79me2 represses HIV-1 reactivation via recruiting DCAF1. Cell Rep 2024; 43:114368. [PMID: 38905100 DOI: 10.1016/j.celrep.2024.114368] [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: 01/03/2024] [Revised: 05/06/2024] [Accepted: 05/31/2024] [Indexed: 06/23/2024] Open
Abstract
DOT1L mediates the methylation of histone H3 at lysine 79 and, in turn, the transcriptional activation or repression in a context-dependent manner, yet the regulatory mechanisms and functions of DOT1L/H3K79me remain to be fully explored. Following peptide affinity purification and proteomic analysis, we identified that DCAF1-a component of the E3 ligase complex involved in HIV regulation-is associated with H3K79me2 and DOT1L. Interestingly, blocking the expression or catalytic activity of DOT1L or repressing the expression of DCAF1 significantly enhances the tumor necrosis factor alpha (TNF-α)/nuclear factor κB (NF-κB)-induced reactivation of the latent HIV-1 genome. Mechanistically, upon TNF-α/NF-κB activation, DCAF1 is recruited to the HIV-1 long terminal repeat (LTR) by DOT1L and H3K79me2. Recruited DCAF1 subsequently induces the ubiquitination of NF-κB and restricts its accumulation at the HIV-1 LTR. Altogether, our findings reveal a feedback modulation of HIV reactivation by DOT1L-mediated histone modification regulation and highlight the potential of targeting the DOT1L/DCAF1 axis as a therapeutic strategy for HIV treatment.
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Affiliation(s)
- Fenfei Liang
- RNA Institute, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Jiaxing Jin
- State Key Laboratory of Experimental Hematology, Tianjin Key Laboratory of Medical Epigenetics, Tianjin Key Laboratory of Cellular Homeostasis and Human Diseases, Department of Cell Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China
| | - Qiming Li
- RNA Institute, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Jiangkai Duan
- RNA Institute, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Ao Jiang
- RNA Institute, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Xiaoqing Chen
- RNA Institute, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Huichao Geng
- RNA Institute, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Kai Wu
- RNA Institute, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Fei Yu
- RNA Institute, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Xiaolu Zhao
- RNA Institute, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Yu Zhou
- RNA Institute, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Deqing Hu
- State Key Laboratory of Experimental Hematology, Tianjin Key Laboratory of Medical Epigenetics, Tianjin Key Laboratory of Cellular Homeostasis and Human Diseases, Department of Cell Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China; Key Laboratory of Breast Cancer Prevention and Therapy, Ministry of Education, Cancer Institute and Hospital of Tianjin Medical University, Tianjin 300060, China.
| | - Liang Chen
- RNA Institute, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan 430072, China.
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2
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Grossmann J, Kratz AS, Kordonsky A, Prag G, Hoffmann I. CRL4 DCAF1 ubiquitin ligase regulates PLK4 protein levels to prevent premature centriole duplication. Life Sci Alliance 2024; 7:e202402668. [PMID: 38490717 PMCID: PMC10942865 DOI: 10.26508/lsa.202402668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Revised: 03/07/2024] [Accepted: 03/07/2024] [Indexed: 03/17/2024] Open
Abstract
Centrioles play important roles in the assembly of centrosomes and cilia. Centriole duplication occurs once per cell cycle and is dependent on polo-like kinase 4 (PLK4). To prevent centriole amplification, which is a hallmark of cancer, PLK4 protein levels need to be tightly regulated. Here, we show that the Cullin4A/B-DDB1-DCAF1, CRL4DCAF1, E3 ligase targets PLK4 for degradation in human cells. DCAF1 binds and ubiquitylates PLK4 in the G2 phase to prevent premature centriole duplication in mitosis. In contrast to the regulation of PLK4 by SCFβ-TrCP, the interaction between PLK4 and DCAF1 is independent of PLK4 kinase activity and mediated by polo-boxes 1 and 2 of PLK4, suggesting that DCAF1 promotes PLK4 ubiquitylation independently of β-TrCP. Thus, the SCFSlimb/β-TrCP pathway, targeting PLK4 for ubiquitylation based on its phosphorylation state and CRL4DCAF1, which ubiquitylates PLK4 by binding to the conserved PB1-PB2 domain, appear to be complementary ways to control PLK4 abundance to prevent centriole overduplication.
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Affiliation(s)
- Josina Grossmann
- Cell Cycle Control and Carcinogenesis, German Cancer Research Center, DKFZ, Heidelberg, Germany
- Faculty of Biosciences, Heidelberg University, Heidelberg, Germany
| | - Anne-Sophie Kratz
- Cell Cycle Control and Carcinogenesis, German Cancer Research Center, DKFZ, Heidelberg, Germany
- Faculty of Biosciences, Heidelberg University, Heidelberg, Germany
| | - Alina Kordonsky
- School of Neurobiology, Biochemistry and Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Gali Prag
- School of Neurobiology, Biochemistry and Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Ingrid Hoffmann
- Cell Cycle Control and Carcinogenesis, German Cancer Research Center, DKFZ, Heidelberg, Germany
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3
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Wang Y, Li J, Wang F, Cui Y, Song L, Ruan B, Yu Y. Analysis of ceRNA Regulatory Mechanism of Rape Pollen Allergy Based on Whole-Transcriptome Sequencing of Peripheral Blood Mononuclear Cells. J Asthma Allergy 2023; 16:775-788. [PMID: 37534326 PMCID: PMC10390718 DOI: 10.2147/jaa.s416772] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 07/12/2023] [Indexed: 08/04/2023] Open
Abstract
Background Rape pollen allergy is a common allergic reaction disorder that affects the health and life of patients seriously. The research on ceRNA regulatory network in rape pollen allergy is poor. Methods High throughput whole-transcriptome sequencing was conducted on rape pollen allergic samples and non-allergic samples. Differentially expressed microRNAs (DEmiRNAs), circRNAs (DEcircRNAs), long non-coding RNA (DElncRNAs), mRNA (DEmRNAs) were identified and a ceRNA regulatory network was constructed by Cytoscape. Functional enrichment analyses were performed on DEmRNAs in the ceRNA network. Then, the least absolute shrinkage and selection operator (LASSO) regression model was used to identify characteristic genes for rape pollen allergy. The receiver operating characteristic (ROC) curve was used to evaluate the diagnostic ability of characteristic genes. Results A total of 25 DEmiRNAs, 258 DEcircRNAs, 304 DElncRNAs, and 383 DEmRNAs in the allergic group compared with the non-allergic group were uncovered, respectively. A ceRNA network containing 21 miRNAs, 57 circRNAs, 28 lncRNAs, and 33 mRNAs was generated with 139 nodes and 160 edges. The signal transduction-related processes, immune-related processes, the ion, inorganic substance, and hormone regulation processes were associated with mRNAs in the ceRNA network. The results of pathway enrichment illustrated that mRNAs in the ceRNA were significantly linked to IL-17 signaling pathway, inflammatory mediator regulation of trp channels, GMP-PKG signaling pathway, signaling by GPCR, and GPCR downstream signaling pathway. Then, five characteristic genes (KCNQ3, CCR5, FOSB, CFAP43, and PRKG1) were defined by the LASSO algorithm. The AUC values of these genes indicated that these genes had a powerful discrimination ability in discriminating allergic samples from non-allergic samples. Conclusion Taken together, we revealed the ceRNA regulatory network in rape pollen allergy and excavated five characteristic genes (KCNQ3, CCR5, FOSB, CFAP43, and PRKG1) with the diagnostic value that may be a potential target in diagnosis and treatment.
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Affiliation(s)
- Ya Wang
- Department of Otolaryngology, the First Affiliated Hospital of Kunming Medical University, Kunming, People’s Republic of China
| | - Jianhua Li
- Department of Otolaryngology, the Sixth Affiliated Hospital of Kunming Medical University, Yuxi, People’s Republic of China
| | - Fang Wang
- Department of Otolaryngology, the First Affiliated Hospital of Kunming Medical University, Kunming, People’s Republic of China
| | - Yunhua Cui
- Department of Otolaryngology, the First Affiliated Hospital of Kunming Medical University, Kunming, People’s Republic of China
| | - Li Song
- Department of Otolaryngology, the First Affiliated Hospital of Kunming Medical University, Kunming, People’s Republic of China
| | - Biao Ruan
- Department of Otolaryngology, the First Affiliated Hospital of Kunming Medical University, Kunming, People’s Republic of China
| | - Yongmei Yu
- Department of Otolaryngology, the First Affiliated Hospital of Kunming Medical University, Kunming, People’s Republic of China
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4
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Kimani S, Owen J, Green SR, Li F, Li Y, Dong A, Brown PJ, Ackloo S, Kuter D, Yang C, MacAskill M, MacKinnon SS, Arrowsmith CH, Schapira M, Shahani V, Halabelian L. Discovery of a Novel DCAF1 Ligand Using a Drug-Target Interaction Prediction Model: Generalizing Machine Learning to New Drug Targets. J Chem Inf Model 2023; 63:4070-4078. [PMID: 37350740 PMCID: PMC10337664 DOI: 10.1021/acs.jcim.3c00082] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Indexed: 06/24/2023]
Abstract
DCAF1 functions as a substrate recruitment subunit for the RING-type CRL4DCAF1 and the HECT family EDVPDCAF1 E3 ubiquitin ligases. The WDR domain of DCAF1 serves as a binding platform for substrate proteins and is also targeted by HIV and SIV lentiviral adaptors to induce the ubiquitination and proteasomal degradation of antiviral host factors. It is therefore attractive both as a potential therapeutic target for the development of chemical inhibitors and as an E3 ligase that could be recruited by novel PROTACs for targeted protein degradation. In this study, we used a proteome-scale drug-target interaction prediction model, MatchMaker, combined with cheminformatics filtering and docking to identify ligands for the DCAF1 WDR domain. Biophysical screening and X-ray crystallographic studies of the predicted binders confirmed a selective ligand occupying the central cavity of the WDR domain. This study shows that artificial intelligence-enabled virtual screening methods can successfully be applied in the absence of previously known ligands.
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Affiliation(s)
- Serah
W. Kimani
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
- Princess
Margaret Cancer Center, University Health
Network, Toronto, Ontario M5G 2C4, Canada
| | - Julie Owen
- Recursion
Pharmaceuticals Inc., Toronto, Ontario M5V 2A2, Canada
| | - Stuart R. Green
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Fengling Li
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Yanjun Li
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Aiping Dong
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Peter J. Brown
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Suzanne Ackloo
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - David Kuter
- Recursion
Pharmaceuticals Inc., Toronto, Ontario M5V 2A2, Canada
| | - Cindy Yang
- Recursion
Pharmaceuticals Inc., Toronto, Ontario M5V 2A2, Canada
| | | | | | - Cheryl H. Arrowsmith
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
- Princess
Margaret Cancer Center, University Health
Network, Toronto, Ontario M5G 2C4, Canada
- Department
of Medical Biophysics, University of Toronto, Toronto, Ontario M5S 1A1, Canada
| | - Matthieu Schapira
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
- Department
of Pharmacology and Toxicology, University
of Toronto, Toronto, Ontario M5S 1A1, Canada
| | - Vijay Shahani
- Recursion
Pharmaceuticals Inc., Toronto, Ontario M5V 2A2, Canada
| | - Levon Halabelian
- Structural
Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
- Department
of Pharmacology and Toxicology, University
of Toronto, Toronto, Ontario M5S 1A1, Canada
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5
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Yi J, Tavana O, Li H, Wang D, Baer RJ, Gu W. Targeting USP2 regulation of VPRBP-mediated degradation of p53 and PD-L1 for cancer therapy. Nat Commun 2023; 14:1941. [PMID: 37024504 PMCID: PMC10079682 DOI: 10.1038/s41467-023-37617-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 03/24/2023] [Indexed: 04/08/2023] Open
Abstract
Since Mdm2 (Mouse double minute 2) inhibitors show serious toxicity in clinic studies, different approaches to achieve therapeutic reactivation of p53-mediated tumor suppression in cancers need to be explored. Here, we identify the USP2 (ubiquitin specific peptidase 2)-VPRBP (viral protein R binding protein) axis as an important pathway for p53 regulation. Like Mdm2, VPRBP is a potent repressor of p53 but VPRBP stability is controlled by USP2. Interestingly, the USP2-VPRBP axis also regulates PD-L1 (programmed death-ligand 1) expression. Strikingly, the combination of a small-molecule USP2 inhibitor and anti-PD1 monoclonal antibody leads to complete regression of the tumors expressing wild-type p53. In contrast to Mdm2, knockout of Usp2 in mice has no obvious effect in normal tissues. Moreover, no obvious toxicity is observed upon the USP2 inhibitor treatment in vivo as Mdm2-mediated regulation of p53 remains intact. Our study reveals a promising strategy for p53-based therapy by circumventing the toxicity issue.
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Affiliation(s)
- Jingjie Yi
- Institute for Cancer Genetics, and Herbert Irving Comprehensive Cancer Center, Vagelos College of Physicians & Surgeons, Columbia University, 1130 Nicholas Ave, New York, NY, 10032, USA
| | - Omid Tavana
- Institute for Cancer Genetics, and Herbert Irving Comprehensive Cancer Center, Vagelos College of Physicians & Surgeons, Columbia University, 1130 Nicholas Ave, New York, NY, 10032, USA
| | - Huan Li
- Institute for Cancer Genetics, and Herbert Irving Comprehensive Cancer Center, Vagelos College of Physicians & Surgeons, Columbia University, 1130 Nicholas Ave, New York, NY, 10032, USA
| | - Donglai Wang
- Institute for Cancer Genetics, and Herbert Irving Comprehensive Cancer Center, Vagelos College of Physicians & Surgeons, Columbia University, 1130 Nicholas Ave, New York, NY, 10032, USA
| | - Richard J Baer
- Institute for Cancer Genetics, and Herbert Irving Comprehensive Cancer Center, Vagelos College of Physicians & Surgeons, Columbia University, 1130 Nicholas Ave, New York, NY, 10032, USA
- Department of Pathology and Cell Biology, Vagelos College of Physicians & Surgeons, Columbia University, 1130 Nicholas Ave, New York, NY, 10032, USA
| | - Wei Gu
- Institute for Cancer Genetics, and Herbert Irving Comprehensive Cancer Center, Vagelos College of Physicians & Surgeons, Columbia University, 1130 Nicholas Ave, New York, NY, 10032, USA.
- Department of Pathology and Cell Biology, Vagelos College of Physicians & Surgeons, Columbia University, 1130 Nicholas Ave, New York, NY, 10032, USA.
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6
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Jevitt AM, Rankin BD, Chen J, Rankin S. The cohesin modifier ESCO2 is stable during DNA replication. Chromosome Res 2023; 31:6. [PMID: 36708487 PMCID: PMC9884251 DOI: 10.1007/s10577-023-09711-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 11/01/2022] [Accepted: 12/13/2022] [Indexed: 01/29/2023]
Abstract
Cohesion between sister chromatids by the cohesin protein complex ensures accurate chromosome segregation and enables recombinational DNA repair. Sister chromatid cohesion is promoted by acetylation of the SMC3 subunit of cohesin by the ESCO2 acetyltransferase, inhibiting cohesin release from chromatin. The interaction of ESCO2 with the DNA replication machinery, in part through PCNA-interacting protein (PIP) motifs in ESCO2, is required for full cohesion establishment. Recent reports have suggested that Cul4-dependent degradation regulates the level of ESCO2 protein following replication. To follow up on these observations, we have characterized ESCO2 stability in Xenopus egg extracts, a cell-free system that recapitulates cohesion establishment in vitro. We found that ESCO2 was stable during DNA replication in this system. Indeed, further challenging the system by inducing DNA damage signaling or increasing the number of nuclei undergoing DNA replication had no significant impact on the stability of ESCO2. In transgenic somatic cell lines, we also did not see evidence of GFP-ESCO2 degradation during S phase of the cell cycle using both flow cytometry and live-cell imaging. We conclude that ESCO2 is stable during DNA replication in both embryonic and somatic cells.
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Affiliation(s)
- Allison M Jevitt
- Cell Cycle and Cancer Biology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA
| | - Brooke D Rankin
- Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA
| | - Jingrong Chen
- Cell Cycle and Cancer Biology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA
| | - Susannah Rankin
- Cell Cycle and Cancer Biology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA.
- Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA.
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7
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Wang C, Mei X, Wu Y, Yang Y, Zeng Z. Cinobufagin alleviates lipopolysaccharide-induced acute lung injury by regulating autophagy through activation of the p53/mTOR pathway. Front Pharmacol 2022; 13:994625. [PMID: 36518680 PMCID: PMC9742439 DOI: 10.3389/fphar.2022.994625] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 11/15/2022] [Indexed: 11/09/2023] Open
Abstract
Acute lung injury (ALI) is a severe clinical disorder characterized by dysregulated inflammatory responses, leading to high rates of morbidity and mortality. Cinobufagin, a primary component isolated from cinobufotalin, exerts strong anticancer effects. However, there are few reports on its role in ALI, and it is unclear whether cinobufagin affects lipopolysaccharide (LPS)-induced ALI. Therefore, the present study aimed to investigate the effect of cinobufagin on LPS-induced ALI and to assess its potential mechanism of action. The results showed that cinobufagin alleviated lung histopathological changes and protected the permeability of lung tissues in LPS-induced ALI. In addition, cinobufagin effectively suppressed inflammatory responses through the induction of autophagy in LPS-induced ALI cells and in a mouse model. Moreover, cinobufagin enhanced autophagy through the p53/mTOR pathway in LPS-induced ALI. Herein, it was reported for the first time that cinobufagin inhibited the inflammatory response of LPS-induced ALI, which laid the foundation for further understanding and development of cinobufagin as a potential new drug for ALI.
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Affiliation(s)
- Cheng Wang
- Department of Critical Care Medicine, Medical Center of Anesthesiology and Pain, The First Affiliated Hospital of Nanchang University, Nanchang, China
- Jiangxi Institute of Respiratory Disease, Nanchang, China
| | - Xianghuang Mei
- Department of Gastrointestinal Surgery, Heji Hospital Affiliated to Changzhi Medical College, Changzhi, China
| | - Yanrong Wu
- Department of Ophthalmology, Affiliated Hospital of Jiangxi University of Traditional Chinese Medicine, Nanchang, China
| | - Yuting Yang
- Department of Critical Care Medicine, Medical Center of Anesthesiology and Pain, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Zhenguo Zeng
- Department of Critical Care Medicine, Medical Center of Anesthesiology and Pain, The First Affiliated Hospital of Nanchang University, Nanchang, China
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8
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Kumar A, Baker NE. The CRL4 E3 ligase Mahjong/DCAF1 controls cell competition through the transcription factor Xrp1, independently of polarity genes. Development 2022; 149:dev200795. [PMID: 36278853 PMCID: PMC9845748 DOI: 10.1242/dev.200795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 10/10/2022] [Indexed: 11/17/2022]
Abstract
Cell competition, the elimination of cells surrounded by more fit neighbors, is proposed to suppress tumorigenesis. Mahjong (Mahj), a ubiquitin E3 ligase substrate receptor, has been thought to mediate competition of cells mutated for lethal giant larvae (lgl), a neoplastic tumor suppressor that defines apical-basal polarity of epithelial cells. Here, we show that Drosophila cells mutated for mahjong, but not for lgl [l(2)gl], are competed because they express the bZip-domain transcription factor Xrp1, already known to eliminate cells heterozygous for ribosomal protein gene mutations (Rp/+ cells). Xrp1 expression in mahj mutant cells results in activation of JNK signaling, autophagosome accumulation, eIF2α phosphorylation and lower translation, just as in Rp/+ cells. Cells mutated for damage DNA binding-protein 1 (ddb1; pic) or cullin 4 (cul4), which encode E3 ligase partners of Mahj, also display Xrp1-dependent phenotypes, as does knockdown of proteasome subunits. Our data suggest a new model of mahj-mediated cell competition that is independent of apical-basal polarity and couples Xrp1 to protein turnover.
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Affiliation(s)
- Amit Kumar
- Department of Genetics, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
| | - Nicholas E. Baker
- Department of Genetics, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA
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9
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Poulose N, Forsythe N, Polonski A, Gregg G, Maguire S, Fuchs M, Minner S, Sauter G, McDade SS, Mills IG. VPRBP Functions Downstream of the Androgen Receptor and OGT to Restrict p53 Activation in Prostate Cancer. Mol Cancer Res 2022; 20:1047-1060. [PMID: 35348747 PMCID: PMC9381113 DOI: 10.1158/1541-7786.mcr-21-0477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 02/13/2022] [Accepted: 03/23/2022] [Indexed: 01/07/2023]
Abstract
Androgen receptor (AR) is a major driver of prostate cancer initiation and progression. O-GlcNAc transferase (OGT), the enzyme that catalyzes the covalent addition of UDP-N-acetylglucosamine (UDP-GlcNAc) to serine and threonine residues of proteins, is often highly expressed in prostate cancer with its expression correlated with high Gleason score. In this study, we have identified an AR and OGT coregulated factor, Vpr (HIV-1) binding protein (VPRBP) also known as DDB1 and CUL4 Associated Factor 1 (DCAF1). We show that VPRBP is regulated by the AR at the transcript level, and stabilized by OGT at the protein level. VPRBP knockdown in prostate cancer cells led to a significant decrease in cell proliferation, p53 stabilization, nucleolar fragmentation, and increased p53 recruitment to the chromatin. In human prostate tumor samples, VPRBP protein overexpression correlated with AR amplification, OGT overexpression, a shorter time to postoperative biochemical progression and poor clinical outcome. In clinical transcriptomic data, VPRBP expression was positively correlated with the AR and also with AR activity gene signatures. IMPLICATIONS In conclusion, we have shown that VPRBP/DCAF1 promotes prostate cancer cell proliferation by restraining p53 activation under the influence of the AR and OGT.
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Affiliation(s)
- Ninu Poulose
- Patrick G Johnston Centre for Cancer Research, Queen's University, Belfast, United Kingdom.,Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom.,Corresponding Authors: Ian G. Mills, Nuffield Department of Surgical Sciences, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, United Kingdom. E-mail: ; and Ninu Poulose,
| | - Nicholas Forsythe
- Patrick G Johnston Centre for Cancer Research, Queen's University, Belfast, United Kingdom
| | - Adam Polonski
- University Medical Center Hamburg-Eppendorf Department of Pathology, Hamburg, Germany
| | - Gemma Gregg
- Patrick G Johnston Centre for Cancer Research, Queen's University, Belfast, United Kingdom
| | - Sarah Maguire
- Patrick G Johnston Centre for Cancer Research, Queen's University, Belfast, United Kingdom
| | - Marc Fuchs
- Patrick G Johnston Centre for Cancer Research, Queen's University, Belfast, United Kingdom
| | - Sarah Minner
- University Medical Center Hamburg-Eppendorf Department of Pathology, Hamburg, Germany
| | - Guido Sauter
- University Medical Center Hamburg-Eppendorf Department of Pathology, Hamburg, Germany
| | - Simon S. McDade
- Patrick G Johnston Centre for Cancer Research, Queen's University, Belfast, United Kingdom
| | - Ian G. Mills
- Patrick G Johnston Centre for Cancer Research, Queen's University, Belfast, United Kingdom.,Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom.,Corresponding Authors: Ian G. Mills, Nuffield Department of Surgical Sciences, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, United Kingdom. E-mail: ; and Ninu Poulose,
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10
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Mohamed WI, Schenk AD, Kempf G, Cavadini S, Basters A, Potenza A, Abdul Rahman W, Rabl J, Reichermeier K, Thomä NH. The CRL4 DCAF1 cullin-RING ubiquitin ligase is activated following a switch in oligomerization state. EMBO J 2021; 40:e108008. [PMID: 34595758 PMCID: PMC8591539 DOI: 10.15252/embj.2021108008] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 09/07/2021] [Accepted: 09/10/2021] [Indexed: 11/09/2022] Open
Abstract
The cullin‐4‐based RING‐type (CRL4) family of E3 ubiquitin ligases functions together with dedicated substrate receptors. Out of the ˜29 CRL4 substrate receptors reported, the DDB1‐ and CUL4‐associated factor 1 (DCAF1) is essential for cellular survival and growth, and its deregulation has been implicated in tumorigenesis. We carried out biochemical and structural studies to examine the structure and mechanism of the CRL4DCAF1 ligase. In the 8.4 Å cryo‐EM map of CRL4DCAF1, four CUL4‐RBX1‐DDB1‐DCAF1 protomers are organized into two dimeric sub‐assemblies. In this arrangement, the WD40 domain of DCAF1 mediates binding with the cullin C‐terminal domain (CTD) and the RBX1 subunit of a neighboring CRL4DCAF1 protomer. This renders RBX1, the catalytic subunit of the ligase, inaccessible to the E2 ubiquitin‐conjugating enzymes. Upon CRL4DCAF1 activation by neddylation, the interaction between the cullin CTD and the neighboring DCAF1 protomer is broken, and the complex assumes an active dimeric conformation. Accordingly, a tetramerization‐deficient CRL4DCAF1 mutant has higher ubiquitin ligase activity compared to the wild‐type. This study identifies a novel mechanism by which unneddylated and substrate‐free CUL4 ligases can be maintained in an inactive state.
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Affiliation(s)
- Weaam I Mohamed
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland.,University of Basel, Basel, Switzerland
| | - Andreas D Schenk
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Georg Kempf
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Simone Cavadini
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Anja Basters
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Alessandro Potenza
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland.,University of Basel, Basel, Switzerland
| | | | - Julius Rabl
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Kurt Reichermeier
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA.,Genentech, South San Francisco, CA, USA
| | - Nicolas H Thomä
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
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11
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Yang L, Chen W, Li L, Xiao Y, Fan S, Zhang Q, Xia T, Li M, Hong Y, Zhao T, Li Q, Liu WH, Xiao N. Ddb1 Is Essential for the Expansion of CD4 + Helper T Cells by Regulating Cell Cycle Progression and Cell Death. Front Immunol 2021; 12:722273. [PMID: 34526995 PMCID: PMC8435776 DOI: 10.3389/fimmu.2021.722273] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Accepted: 08/06/2021] [Indexed: 11/13/2022] Open
Abstract
Follicular helper T (TFH) cells are specialized CD4+ helper T cells that provide help to B cells in humoral immunity. However, the molecular mechanism underlying generation of TFH cells is incompletely understood. Here, we reported that Damage-specific DNA binding protein 1 (Ddb1) was required for expansion of CD4+ helper T cells including TFH and Th1 cells, germinal center response, and antibody response to acute viral infection. Ddb1 deficiency in activated CD4+ T cells resulted in cell cycle arrest at G2-M phase and increased cell death, due to accumulation of DNA damage and hyperactivation of ATM/ATR-Chk1 signaling. Moreover, mice with deletion of both Cul4a and Cul4b in activated CD4+ T cells phenocopied Ddb1-deficient mice, suggesting that E3 ligase-dependent function of Ddb1 was crucial for genome maintenance and helper T-cell generation. Therefore, our results indicate that Ddb1 is an essential positive regulator in the expansion of CD4+ helper T cells.
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Affiliation(s)
- Lingtao Yang
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, China
| | - Wei Chen
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, China
| | - Li Li
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, China
| | - Yueyue Xiao
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, China
| | - Shilin Fan
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, China
| | - Quan Zhang
- School of Medicine, Xiamen University, Xiamen, China
| | - Tian Xia
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, China
| | - Mengjie Li
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, China
| | - Yazhen Hong
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, China
| | - Tongjin Zhao
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, China
| | - Qiyuan Li
- School of Medicine, Xiamen University, Xiamen, China
| | - Wen-Hsien Liu
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, China
| | - Nengming Xiao
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, China
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12
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Zong Y, Shan H, Yin F, Ma X, Jiang C, Wang N, Zhou L, Lin Y, Zhou Z, Yu X. Ddb1-Cullin4-Associated-Factor 1 in Macrophages Restricts the Staphylococcus aureus-Induced Osteomyelitis. J Inflamm Res 2021; 14:1667-1676. [PMID: 33953594 PMCID: PMC8091595 DOI: 10.2147/jir.s307316] [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: 02/18/2021] [Accepted: 04/12/2021] [Indexed: 11/23/2022] Open
Abstract
Introduction Ddb1-cullin4-associated-factor 1 (DCAF1) is known to regulate protein ubiquitination, while the roles of DCAF1 in osteomyelitis remain unknown. This study aims to investigate the effects of DCAF1 deficiency in macrophages on osteomyelitis and elucidate the molecular mechanism. Methods Staphylococcus aureus-induced mouse model of osteomyelitis was established on the DCAF1fl/flLyz2cre/+ and DCAF1fl/flLyz2+/+ (control) mice. Flow cytometry was conducted to analyze the populations of adaptive and innate immune cells. Lipopolysaccharides (LPS)-induced bone marrow-derived macrophages (BMDMs) were established. qRT-PCR and immunoblot analysis were used to determine the levels of inflammation-related biomarkers. ELISA was used to determine the release of inflammatory cytokines including IL-1β, IL-6, and TNF. Results The populations of immune cells in the bone marrow and spleen were not affected due to DCAF1 deficiency in macrophages. DCAF1 suppressed inflammatory cytokines in LPS-induced BMDMs. Additionally, DCAF1 deficiency in macrophages induced severe symptoms including less bacterial load in the femur, cortical bone loss, and reactive bone formation. Mechanistic study revealed that DCAF1 deficiency induced p38 hyperactivation. Discussion DCAF1 in macrophages suppressed the Staphylococcus aureus-induced mouse model of osteomyelitis.
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Affiliation(s)
- Yang Zong
- Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, 200233, People's Republic of China
| | - Haojie Shan
- Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, 200233, People's Republic of China
| | - Fuli Yin
- Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, 200233, People's Republic of China
| | - Xin Ma
- Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, 200233, People's Republic of China
| | - Chaolai Jiang
- Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, 200233, People's Republic of China
| | - Nan Wang
- Department of Emergency, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, People's Republic of China
| | - Lihui Zhou
- Department of Orthopaedic Surgery, Xiangshan First People's Hospital, Ningbo, Zhejiang, 315700, People's Republic of China
| | - Yiwei Lin
- Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, 200233, People's Republic of China
| | - Zubin Zhou
- Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, 200233, People's Republic of China
| | - Xiaowei Yu
- Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, 200233, People's Republic of China
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13
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Guo Z, Wang G, Wu B, Chou WC, Cheng L, Zhou C, Lou J, Wu D, Su L, Zheng J, Ting JPY, Wan YY. DCAF1 regulates Treg senescence via the ROS axis during immunological aging. J Clin Invest 2021; 130:5893-5908. [PMID: 32730228 DOI: 10.1172/jci136466] [Citation(s) in RCA: 71] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 07/29/2020] [Indexed: 12/12/2022] Open
Abstract
As a hallmark of immunological aging, low-grade, chronic inflammation with accumulation of effector memory T cells contributes to increased susceptibility to many aging-related diseases. While the proinflammatory state of aged T cells indicates a dysregulation of immune homeostasis, whether and how aging drives regulatory T cell (Treg) aging and alters Treg function are not fully understood owing to a lack of specific aging markers. Here, by a combination of cellular, molecular, and bioinformatic approaches, we discovered that Tregs senesce more severely than conventional T (Tconv) cells during aging. We found that Tregs from aged mice were less efficient than young Tregs in suppressing Tconv cell function in an inflammatory bowel disease model and in preventing Tconv cell aging in an irradiation-induced aging model. Furthermore, we revealed that DDB1- and CUL4-associated factor 1 (DCAF1) was downregulated in aged Tregs and was critical to restrain Treg aging via reactive oxygen species (ROS) regulated by glutathione-S-transferase P (GSTP1). Importantly, interfering with GSTP1 and ROS pathways reinvigorated the proliferation and function of aged Tregs. Therefore, our studies uncover an important role of the DCAF1/GSTP1/ROS axis in Treg senescence, which leads to uncontrolled inflammation and immunological aging.
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Affiliation(s)
- Zengli Guo
- Lineberger Comprehensive Cancer Center and.,Department of Microbiology and Immunology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Gang Wang
- Lineberger Comprehensive Cancer Center and.,Department of Microbiology and Immunology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.,Jiangsu Center for the Collaboration and Innovation of Cancer Biotherapy, Cancer Institute, Xuzhou Medical University, Xuzhou, China
| | - Bing Wu
- Lineberger Comprehensive Cancer Center and.,Department of Microbiology and Immunology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Wei-Chun Chou
- Lineberger Comprehensive Cancer Center and.,Department of Genetics
| | - Liang Cheng
- Lineberger Comprehensive Cancer Center and.,Department of Microbiology and Immunology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | | | - Jitong Lou
- Department of Biostatistics, Gillings School of Global Public Health, and
| | - Di Wu
- Department of Biostatistics, Gillings School of Global Public Health, and.,Department of Periodontology, School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Lishan Su
- Lineberger Comprehensive Cancer Center and.,Department of Microbiology and Immunology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Junnian Zheng
- Jiangsu Center for the Collaboration and Innovation of Cancer Biotherapy, Cancer Institute, Xuzhou Medical University, Xuzhou, China
| | - Jenny P-Y Ting
- Lineberger Comprehensive Cancer Center and.,Department of Microbiology and Immunology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.,Department of Genetics
| | - Yisong Y Wan
- Lineberger Comprehensive Cancer Center and.,Department of Microbiology and Immunology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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14
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Dar AA, Sawada K, Dybas JM, Moser EK, Lewis EL, Park E, Fazelinia H, Spruce LA, Ding H, Seeholzer SH, Oliver PM. The E3 ubiquitin ligase Cul4b promotes CD4+ T cell expansion by aiding the repair of damaged DNA. PLoS Biol 2021; 19:e3001041. [PMID: 33524014 PMCID: PMC7888682 DOI: 10.1371/journal.pbio.3001041] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 02/17/2021] [Accepted: 01/15/2021] [Indexed: 12/26/2022] Open
Abstract
The capacity for T cells to become activated and clonally expand during pathogen invasion is pivotal for protective immunity. Our understanding of how T cell receptor (TCR) signaling prepares cells for this rapid expansion remains limited. Here we provide evidence that the E3 ubiquitin ligase Cullin-4b (Cul4b) regulates this process. The abundance of total and neddylated Cul4b increased following TCR stimulation. Disruption of Cul4b resulted in impaired proliferation and survival of activated T cells. Additionally, Cul4b-deficient CD4+ T cells accumulated DNA damage. In T cells, Cul4b preferentially associated with the substrate receptor DCAF1, and Cul4b and DCAF1 were found to interact with proteins that promote the sensing or repair of damaged DNA. While Cul4b-deficient CD4+ T cells showed evidence of DNA damage sensing, downstream phosphorylation of SMC1A did not occur. These findings reveal an essential role for Cul4b in promoting the repair of damaged DNA to allow survival and expansion of activated T cells.
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Affiliation(s)
- Asif A. Dar
- Division of Protective Immunity, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Keisuke Sawada
- Division of Protective Immunity, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Joseph M. Dybas
- Division of Protective Immunity, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
- Department of Biomedical Health and Informatics, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Emily K. Moser
- Division of Protective Immunity, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Emma L. Lewis
- Medical Scientist Training Program, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Eddie Park
- Center for Computational and Genomic Medicine, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Hossein Fazelinia
- Division of Cell Pathology, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Lynn A. Spruce
- Division of Cell Pathology, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Hua Ding
- Division of Cell Pathology, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Steven H. Seeholzer
- Division of Cell Pathology, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Paula M. Oliver
- Division of Protective Immunity, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
- Department of Pathology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
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15
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Han XR, Sasaki N, Jackson SC, Wang P, Li Z, Smith MD, Xie L, Chen X, Zhang Y, Marzluff WF, Xiong Y. CRL4 DCAF1/VprBP E3 ubiquitin ligase controls ribosome biogenesis, cell proliferation, and development. SCIENCE ADVANCES 2020; 6:eabd6078. [PMID: 33355139 PMCID: PMC11206221 DOI: 10.1126/sciadv.abd6078] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 10/27/2020] [Indexed: 06/12/2023]
Abstract
Evolutionarily conserved DCAF1 is a major substrate receptor for the DDB1-CUL4-ROC1 E3 ubiquitin ligase (CRL4) and controls cell proliferation and development. The molecular basis for these functions is unclear. We show here that DCAF1 loss in multiple tissues and organs selectively eliminates proliferating cells and causes perinatal lethality, thymic atrophy, and bone marrow defect. Inducible DCAF1 loss eliminates proliferating, but not quiescent, T cells and MEFs. We identify the ribosome assembly factor PWP1 as a substrate of the CRL4DCAF1 ligase. DCAF1 loss results in PWP1 accumulation, impairing rRNA processing and ribosome biogenesis. Knockdown or overexpression of PWP1 can rescue defects or cause similar defects as DCAF1 loss, respectively, in ribosome biogenesis. DCAF1 loss increases free RPL11, resulting in L11-MDM2 association and p53 activation. Cumulatively, these results reveal a critical function for DCAF1 in ribosome biogenesis and define a molecular basis of DCAF1 function in cell proliferation and development.
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Affiliation(s)
- Xiao-Ran Han
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Naoya Sasaki
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Sarah C Jackson
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Pu Wang
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Zhijun Li
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Matthew D Smith
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Ling Xie
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Xian Chen
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Yanping Zhang
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Department of Radiation Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - William F Marzluff
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Integrative Program for Biological and Genome Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Yue Xiong
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Integrative Program for Biological and Genome Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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16
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Schabla NM, Mondal K, Swanson PC. DCAF1 (VprBP): emerging physiological roles for a unique dual-service E3 ubiquitin ligase substrate receptor. J Mol Cell Biol 2020; 11:725-735. [PMID: 30590706 PMCID: PMC6821201 DOI: 10.1093/jmcb/mjy085] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 10/01/2018] [Accepted: 12/21/2018] [Indexed: 12/12/2022] Open
Abstract
Cullin-RING ligases (CRLs) comprise a large group of modular eukaryotic E3 ubiquitin ligases. Within this family, the CRL4 ligase (consisting of the Cullin4 [CUL4] scaffold protein, the Rbx1 RING finger domain protein, the DNA damage-binding protein 1 [DDB1], and one of many DDB1-associated substrate receptor proteins) has been intensively studied in recent years due to its involvement in regulating various cellular processes, its role in cancer development and progression, and its subversion by viral accessory proteins. Initially discovered as a target for hijacking by the human immunodeficiency virus accessory protein r, the normal targets and function of the CRL4 substrate receptor protein DDB1–Cul4-associated factor 1 (DCAF1; also known as VprBP) had remained elusive, but newer studies have begun to shed light on these questions. Here, we review recent progress in understanding the diverse physiological roles of this DCAF1 in supporting various general and cell type-specific cellular processes in its context with the CRL4 E3 ligase, as well as another HECT-type E3 ligase with which DCAF1 also associates, called EDD/UBR5. We also discuss emerging questions and areas of future study to uncover the dynamic roles of DCAF1 in normal physiology.
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Affiliation(s)
- N Max Schabla
- Department of Medical Microbiology and Immunology, Creighton University, 2500 California Plaza, Omaha, NE, USA
| | - Koushik Mondal
- Department of Medical Microbiology and Immunology, Creighton University, 2500 California Plaza, Omaha, NE, USA
| | - Patrick C Swanson
- Department of Medical Microbiology and Immunology, Creighton University, 2500 California Plaza, Omaha, NE, USA
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17
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Greenwood EJD, Williamson JC, Sienkiewicz A, Naamati A, Matheson NJ, Lehner PJ. Promiscuous Targeting of Cellular Proteins by Vpr Drives Systems-Level Proteomic Remodeling in HIV-1 Infection. Cell Rep 2020; 27:1579-1596.e7. [PMID: 31042482 PMCID: PMC6506760 DOI: 10.1016/j.celrep.2019.04.025] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 03/19/2019] [Accepted: 04/02/2019] [Indexed: 12/26/2022] Open
Abstract
HIV-1 encodes four “accessory proteins” (Vif, Vpr, Vpu, and Nef), dispensable for viral replication in vitro but essential for viral pathogenesis in vivo. Well characterized cellular targets have been associated with Vif, Vpu, and Nef, which counteract host restriction and promote viral replication. Conversely, although several substrates of Vpr have been described, their biological significance remains unclear. Here, we use complementary unbiased mass spectrometry-based approaches to demonstrate that Vpr is both necessary and sufficient for the DCAF1/DDB1/CUL4 E3 ubiquitin ligase-mediated degradation of at least 38 cellular proteins, causing systems-level changes to the cellular proteome. We therefore propose that promiscuous targeting of multiple host factors underpins complex Vpr-dependent cellular phenotypes and validate this in the case of G2/M cell cycle arrest. Our model explains how Vpr modulates so many cell biological processes and why the functional consequences of previously described Vpr targets, identified and studied in isolation, have proved elusive. HIV-1 Vpr is responsible for almost all proteomic changes in HIV-1-infected cells Vpr directly targets multiple nuclear proteins for degradation Vpr cellular phenotypes (e.g., cell cycle arrest) stem from broad substrate targeting Targeting of a few proteins is conserved across diverse primate lentiviral species
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Affiliation(s)
- Edward J D Greenwood
- Department of Medicine, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0QQ, UK; Cambridge Institute for Medical Research, Keith Peters Building, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0XY, UK; Cambridge Institute of Therapeutic Immunology and Infectious Disease, Jeffrey Cheah Biomedical Centre, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0AW, UK.
| | - James C Williamson
- Department of Medicine, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0QQ, UK; Cambridge Institute for Medical Research, Keith Peters Building, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0XY, UK; Cambridge Institute of Therapeutic Immunology and Infectious Disease, Jeffrey Cheah Biomedical Centre, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0AW, UK.
| | - Agata Sienkiewicz
- Department of Medicine, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0QQ, UK; Cambridge Institute for Medical Research, Keith Peters Building, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0XY, UK; Cambridge Institute of Therapeutic Immunology and Infectious Disease, Jeffrey Cheah Biomedical Centre, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0AW, UK
| | - Adi Naamati
- Department of Medicine, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0QQ, UK; Cambridge Institute of Therapeutic Immunology and Infectious Disease, Jeffrey Cheah Biomedical Centre, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0AW, UK
| | - Nicholas J Matheson
- Department of Medicine, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0QQ, UK; Cambridge Institute of Therapeutic Immunology and Infectious Disease, Jeffrey Cheah Biomedical Centre, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0AW, UK
| | - Paul J Lehner
- Department of Medicine, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0QQ, UK; Cambridge Institute for Medical Research, Keith Peters Building, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0XY, UK; Cambridge Institute of Therapeutic Immunology and Infectious Disease, Jeffrey Cheah Biomedical Centre, Cambridge Biomedical Campus, University of Cambridge, Cambridge CB2 0AW, UK.
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18
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Sun Y, Zhang Y, Ren S, Li X, Yang P, Zhu J, Lin L, Wang Z, Jia Y. Low expression of RGL4 is associated with a poor prognosis and immune infiltration in lung adenocarcinoma patients. Int Immunopharmacol 2020; 83:106454. [PMID: 32259700 DOI: 10.1016/j.intimp.2020.106454] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 03/25/2020] [Accepted: 03/27/2020] [Indexed: 01/22/2023]
Abstract
Lung adenocarcinoma (LUAD) is a frequently diagnosed histologic subtype with increasing morbidity and mortality. RalGDS-Like 4 (RGL4) has not been reported to be associated with cancer risk, prognosis, immunotherapy or any other treatments. We perform a bioinformatics analysis on data downloaded from the Cancer Genome Atlas (TCGA)-LUAD, and we find that low expression of RGL4 is accompanied by worse outcomes and prognosis in LUAD patients. As a promising predictor, the potential influence and mechanisms of RGL4 on overall survival are worth exploring. Moreover, RGL4 expression is significantly associated with a variety of tumor-infiltrating immune cells (TIICs), particularly memory B cells, CD8+T cells and neutrophils. Subsequently, we evaluated the most notable KEGG pathways, including glycolysis gluconeogenesis, the P53 signaling pathway, RNA degradation, and the B cell receptor signaling pathway, among others. Our findings provide evidence that the decreased expression of RGL4 is significantly associated with poor prognosis and immune cell infiltration in patients with LUAD and highlight the use of RGL4 as a novel predictive biomarker for the prognosis of LUAD and other cancers. RGL4 may also be used in combination with immune checkpoints to identify the benefits of immunotherapy. Subjects: Bioinformatics, Genomics, Oncology, Thoracic surgery.
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Affiliation(s)
- Yidan Sun
- Department of Oncology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, PR China; Department of Oncology, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, PR China
| | - Ying Zhang
- Department of Oncology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, PR China
| | - Shiqi Ren
- Department of Clinical Biobank, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226000, PR China; Department of Medicine, Nantong University Xinling College, Nantong, Jiangsu 226001, PR China
| | - Xiaojiang Li
- Department of Oncology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, PR China
| | - Peiying Yang
- Department of Oncology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, PR China
| | - Jinli Zhu
- Department of Oncology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, PR China
| | - Lisen Lin
- Department of Oncology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, PR China
| | - Ziheng Wang
- Department of Clinical Biobank, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226000, PR China.
| | - Yingjie Jia
- Department of Oncology, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, PR China.
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19
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20
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Ferreira MAR, Vonk JM, Baurecht H, Marenholz I, Tian C, Hoffman JD, Helmer Q, Tillander A, Ullemar V, Lu Y, Rüschendorf F, Hinds DA, Hübner N, Weidinger S, Magnusson PKE, Jorgenson E, Lee YA, Boomsma DI, Karlsson R, Almqvist C, Koppelman GH, Paternoster L. Eleven loci with new reproducible genetic associations with allergic disease risk. J Allergy Clin Immunol 2019; 143:691-699. [PMID: 29679657 PMCID: PMC7189804 DOI: 10.1016/j.jaci.2018.03.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Revised: 02/01/2018] [Accepted: 03/19/2018] [Indexed: 12/18/2022]
Abstract
BACKGROUND A recent genome-wide association study (GWAS) identified 99 loci that contain genetic risk variants shared between asthma, hay fever, and eczema. Many more risk loci shared between these common allergic diseases remain to be discovered, which could point to new therapeutic opportunities. OBJECTIVE We sought to identify novel risk loci shared between asthma, hay fever, and eczema by applying a gene-based test of association to results from a published GWAS that included data from 360,838 subjects. METHODS We used approximate conditional analysis to adjust the results from the published GWAS for the effects of the top risk variants identified in that study. We then analyzed the adjusted GWAS results with the EUGENE gene-based approach, which combines evidence for association with disease risk across regulatory variants identified in different tissues. Novel gene-based associations were followed up in an independent sample of 233,898 subjects from the UK Biobank study. RESULTS Of the 19,432 genes tested, 30 had a significant gene-based association at a Bonferroni-corrected P value of 2.5 × 10-6. Of these, 20 were also significantly associated (P < .05/30 = .0016) with disease risk in the replication sample, including 19 that were located in 11 loci not reported to contain allergy risk variants in previous GWASs. Among these were 9 genes with a known function that is directly relevant to allergic disease: FOSL2, VPRBP, IPCEF1, PRR5L, NCF4, APOBR, IL27, ATXN2L, and LAT. For 4 genes (eg, ATXN2L), a genetically determined decrease in gene expression was associated with decreased allergy risk, and therefore drugs that inhibit gene expression or function are predicted to ameliorate disease symptoms. The opposite directional effect was observed for 14 genes, including IL27, a cytokine known to suppress TH2 responses. CONCLUSION Using a gene-based approach, we identified 11 risk loci for allergic disease that were not reported in previous GWASs. Functional studies that investigate the contribution of the 19 associated genes to the pathophysiology of allergic disease and assess their therapeutic potential are warranted.
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Affiliation(s)
- Manuel A R Ferreira
- Genetics and Computational Biology, QIMR Berghofer Medical Research Institute, Brisbane, Australia.
| | - Judith M Vonk
- Epidemiology, University of Groningen, University Medical Center Groningen, Groningen Research Institute for Asthma and COPD, Groningen, The Netherlands
| | - Hansjörg Baurecht
- Department of Dermatology, Allergology and Venereology, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany
| | - Ingo Marenholz
- Max Delbrück Center (MDC) for Molecular Medicine, Berlin, Germany; Clinic for Pediatric Allergy, Experimental and Clinical Research Center of Charité Universitätsmedizin Berlin and Max Delbrück Center, Berlin, Germany
| | | | - Joshua D Hoffman
- Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, Calif
| | - Quinta Helmer
- Department Biological Psychology, Netherlands Twin Register, Vrije University, Amsterdam, The Netherlands
| | - Annika Tillander
- Department of Medical Epidemiology and Biostatistics and the Swedish Twin Registry, Karolinska Institutet, Stockholm, Sweden
| | - Vilhelmina Ullemar
- Department of Medical Epidemiology and Biostatistics and the Swedish Twin Registry, Karolinska Institutet, Stockholm, Sweden
| | - Yi Lu
- Department of Medical Epidemiology and Biostatistics and the Swedish Twin Registry, Karolinska Institutet, Stockholm, Sweden
| | | | | | - Norbert Hübner
- Max Delbrück Center (MDC) for Molecular Medicine, Berlin, Germany
| | - Stephan Weidinger
- Department of Dermatology, Allergology and Venereology, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany
| | - Patrik K E Magnusson
- Department of Medical Epidemiology and Biostatistics and the Swedish Twin Registry, Karolinska Institutet, Stockholm, Sweden
| | - Eric Jorgenson
- Division of Research, Kaiser Permanente Northern California, Oakland, Calif
| | - Young-Ae Lee
- Max Delbrück Center (MDC) for Molecular Medicine, Berlin, Germany; Clinic for Pediatric Allergy, Experimental and Clinical Research Center of Charité Universitätsmedizin Berlin and Max Delbrück Center, Berlin, Germany
| | - Dorret I Boomsma
- Department Biological Psychology, Netherlands Twin Register, Vrije University, Amsterdam, The Netherlands
| | - Robert Karlsson
- Department of Medical Epidemiology and Biostatistics and the Swedish Twin Registry, Karolinska Institutet, Stockholm, Sweden
| | - Catarina Almqvist
- Department of Medical Epidemiology and Biostatistics and the Swedish Twin Registry, Karolinska Institutet, Stockholm, Sweden; Pediatric Allergy and Pulmonology Unit at Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden
| | - Gerard H Koppelman
- University of Groningen, University Medical Center Groningen, Beatrix Children's Hospital, Pediatric Pulmonology and Pediatric Allergology, and University of Groningen, University Medical Center Groningen, Groningen Research Institute for Asthma and COPD, Groningen, The Netherlands
| | - Lavinia Paternoster
- MRC Integrative Epidemiology Unit, School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
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21
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Cheng J, Guo J, North BJ, Tao K, Zhou P, Wei W. The emerging role for Cullin 4 family of E3 ligases in tumorigenesis. Biochim Biophys Acta Rev Cancer 2018; 1871:138-159. [PMID: 30602127 DOI: 10.1016/j.bbcan.2018.11.007] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Revised: 11/28/2018] [Accepted: 11/29/2018] [Indexed: 02/06/2023]
Abstract
As a member of the Cullin-RING ligase family, Cullin-RING ligase 4 (CRL4) has drawn much attention due to its broad regulatory roles under physiological and pathological conditions, especially in neoplastic events. Based on evidence from knockout and transgenic mouse models, human clinical data, and biochemical interactions, we summarize the distinct roles of the CRL4 E3 ligase complexes in tumorigenesis, which appears to be tissue- and context-dependent. Notably, targeting CRL4 has recently emerged as a noval anti-cancer strategy, including thalidomide and its derivatives that bind to the substrate recognition receptor cereblon (CRBN), and anticancer sulfonamides that target DCAF15 to suppress the neoplastic proliferation of multiple myeloma and colorectal cancers, respectively. To this end, PROTACs have been developed as a group of engineered bi-functional chemical glues that induce the ubiquitination-mediated degradation of substrates via recruiting E3 ligases, such as CRL4 (CRBN) and CRL2 (pVHL). We summarize the recent major advances in the CRL4 research field towards understanding its involvement in tumorigenesis and further discuss its clinical implications. The anti-tumor effects using the PROTAC approach to target the degradation of undruggable targets are also highlighted.
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Affiliation(s)
- Ji Cheng
- Department of Gastrointestinal Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China; Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Jianping Guo
- Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Brian J North
- Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Kaixiong Tao
- Department of Gastrointestinal Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Pengbo Zhou
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, 1300 York Ave., New York, NY 10065, USA.
| | - Wenyi Wei
- Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.
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22
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Fan K, Wang F, Li Y, Chen L, Gao Z, Zhang Y, Duan JY, Huang T, Zhong J, Liu RB, Mao X, Fan H, Guo X, Jin J. CRL4 DCAF2 is required for mature T-cell expansion via Aurora B-regulated proteasome activity. J Autoimmun 2018; 96:74-85. [PMID: 30245026 DOI: 10.1016/j.jaut.2018.08.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 08/18/2018] [Accepted: 08/21/2018] [Indexed: 12/14/2022]
Abstract
The proliferation of T cells in peripheral lymphoid tissues requires T cell receptor (TCR)-mediated cell cycle entry. However, the underlying mechanism regulating cell cycle progression in mature T cells is incompletely understood. Here, we have identified an E3 ubiquitin ligase, CRL4DCAF2, as a critical mediator controlling M phase exit in activated T cells. DCAF2 expression is induced upon TCR stimulation and its deficiency attenuates T cell expansion. Additionally, DCAF2 T cell-specific knockout mice display impaired peripheral T cell maintenance and reduced severity of various autoimmune diseases. Continuous H4K20me1 modification caused by DCAF2 deficiency inhibits the induction of Aurkb expression, which regulates 26S proteasome activity during G2/M phase. CRL4DCAF2 deficiency causes M phase arrest through proteasome-dependent mechanisms in peripheral T cells. Our findings establish DCAF2 as a novel target for T cell-mediated autoimmunity or inflammatory diseases.
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Affiliation(s)
- Keqi Fan
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, China
| | - Fei Wang
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, China
| | - Yiyuan Li
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, China
| | - Lu Chen
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, China
| | - Zhengjun Gao
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, China
| | - Yu Zhang
- Sir Run Run Shaw Hospital, College of Medicine Zhejiang University, Hangzhou, 310016, China
| | - Jin-Yuan Duan
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, China
| | - Tao Huang
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, China
| | - Jiangyan Zhong
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, China
| | - Rong-Bei Liu
- Sir Run Run Shaw Hospital, College of Medicine Zhejiang University, Hangzhou, 310016, China
| | - Xintao Mao
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, China
| | - Hengyu Fan
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, China
| | - Xing Guo
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, China.
| | - Jin Jin
- Life Sciences Institute, Zhejiang University, Hangzhou, 310058, China; Key Laboratory of Animal Virology of Ministry of Agriculture, Zhejiang University, Hangzhou, 310058, PR China.
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23
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DCAF1 is involved in HCV replication through regulation of miR-122. Arch Virol 2018; 163:977-985. [PMID: 29327233 DOI: 10.1007/s00705-017-3691-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 11/01/2017] [Indexed: 12/12/2022]
Abstract
Hepatitis C virus (HCV) is a worldwide threaten to human health with a high ratio of chronic infections. Recently, we found that Vpr-mediated regulation of HCV replication depends on the host protein DDB1-Cul4 associate factor 1 (DCAF1), implying that DCAF1 might be involved in the replication of HCV. In this study, we demonstrated that DCAF1 knockdown reduced HCV replication both in the infectious (JFH1) and replicon (Con1) systems. Further investigation showed a negative regulation of HCV internal ribosome entry site (IRES)-mediated translation by DCAF1. Considering the positive effects on the replication of the HCV replicon, we speculated that DCAF1 affected the balance between HCV RNA replication and protein translation. Since miR-122 is involved in the regulation of this balance, we investigated the influence of DCAF1 on miR-122 expression. By measuring the expression of miR-122, pre-miR-122 and its target CAT-1 mRNA, we found that miR-122 was downregulated following DCAF1 knockdown. Furthermore, overexpression of miR-122 rescued HCV replication impairment induced by DCAF1 knockdown. In conclusion, our study suggests that DCAF1 is involved in HCV replication through regulation of miR-122 and thus provides new insights into the interaction between HCV and the host cell.
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24
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Zhao AQ, Xie H, Lin SY, Lei Q, Ren WX, Gao F, Guo H, Guo AY, Chen ZC, Wang HX. Interferon-γ alters the immune-related miRNA expression of microvesicles derived from mesenchymal stem cells. ACTA ACUST UNITED AC 2017; 37:179-184. [PMID: 28397044 DOI: 10.1007/s11596-017-1712-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 01/09/2017] [Indexed: 12/13/2022]
Abstract
Increasing studies have demonstrated that interferon gamma (IFN-γ), which serves as a critical inflammatory cytokine, is essential to induce the immunosuppressive effects of mesenchymal stem cells (MSCs). However, the mechanisms underlying the enhanced immunosuppressive effects of IFN-γ-stimulated MSCs (γMSCs) are not fully understood. MSC-derived microvesicles (MSC-MVs) have been viewed as potential pivotal mediators of the immunosuppressive effects of MSCs. Moreover, microRNAs (miRNAs) are important regulators of immunological processes and can be shuttled from cell to cell by MVs. The aim of our study was to analyze the the miRNA expression signature of MVs derived from γMSCs (γMSC-MVs), which may provide better understanding of the immunosuppressive property of their parent cells. Through miRNA microarray and bioinformatics analysis, we found 62 significantly differentially expressed miRNAs (DEMs) in γMSC-MVs compared with MSC-MVs. And the potential target genes and signaling pathways regulated by DEMs were predicted and analyzed. Interestingly, many DEMs and predicted signaling pathways had been demonstrated to be involved in immunoregulation. Furthermore, the network between immunoregulation-related pathways and relevant DEMs was constructed. Collectively, our research on the miRNA repertoires of γMSC-MVs not only provides new perspectives into the mechanisms underlying the enhanced immunosuppressive property of γMSCs, but also paves the way to clinical application of these potent organelles in the future.
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Affiliation(s)
- Ai-Qi Zhao
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Hui Xie
- Department of Geriatrics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Sheng-Yan Lin
- Hubei Bioinformatics & Molecular Imaging Key Laboratory, Department of Bioinformatics and Systems Biology, Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Qian Lei
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Wen-Xiang Ren
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Fei Gao
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Hao Guo
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - An-Yuan Guo
- Hubei Bioinformatics & Molecular Imaging Key Laboratory, Department of Bioinformatics and Systems Biology, Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Zhi-Chao Chen
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
| | - Hong-Xiang Wang
- Department of Hematology, Wuhan Central Hospital, Wuhan, 430022, China.
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