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Saville KM, Al-Rahahleh RQ, Siddiqui AH, Andrews ME, Roos WP, Koczor CA, Andrews JF, Hayat F, Migaud ME, Sobol RW. Oncometabolite 2-hydroxyglutarate suppresses basal protein levels of DNA polymerase beta that enhances alkylating agent and PARG inhibition induced cytotoxicity. DNA Repair (Amst) 2024; 140:103700. [PMID: 38897003 PMCID: PMC11239280 DOI: 10.1016/j.dnarep.2024.103700] [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: 03/10/2023] [Revised: 05/10/2024] [Accepted: 05/29/2024] [Indexed: 06/21/2024]
Abstract
Mutations in isocitrate dehydrogenase isoform 1 (IDH1) are primarily found in secondary glioblastoma (GBM) and low-grade glioma but are rare in primary GBM. The standard treatment for GBM includes radiation combined with temozolomide, an alkylating agent. Fortunately, IDH1 mutant gliomas are sensitive to this treatment, resulting in a more favorable prognosis. However, it's estimated that up to 75 % of IDH1 mutant gliomas will progress to WHO grade IV over time and develop resistance to alkylating agents. Therefore, understanding the mechanism(s) by which IDH1 mutant gliomas confer sensitivity to alkylating agents is crucial for developing targeted chemotherapeutic approaches. The base excision repair (BER) pathway is responsible for repairing most base damage induced by alkylating agents. Defects in this pathway can lead to hypersensitivity to these agents due to unresolved DNA damage. The coordinated assembly and disassembly of BER protein complexes are essential for cell survival and for maintaining genomic integrity following alkylating agent exposure. These complexes rely on poly-ADP-ribose formation, an NAD+-dependent post-translational modification synthesized by PARP1 and PARP2 during the BER process. At the lesion site, poly-ADP-ribose facilitates the recruitment of XRCC1. This scaffold protein helps assemble BER proteins like DNA polymerase beta (Polβ), a bifunctional DNA polymerase containing both DNA synthesis and 5'-deoxyribose-phosphate lyase (5'dRP lyase) activity. Here, we confirm that IDH1 mutant glioma cells have defective NAD+ metabolism, but still produce sufficient nuclear NAD+ for robust PARP1 activation and BER complex formation in response to DNA damage. However, the overproduction of 2-hydroxyglutarate, an oncometabolite produced by the IDH1 R132H mutant protein, suppresses BER capacity by reducing Polβ protein levels. This defines a novel mechanism by which the IDH1 mutation in gliomas confers cellular sensitivity to alkylating agents and to inhibitors of the poly-ADP-ribose glycohydrolase, PARG.
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Affiliation(s)
- Kate M Saville
- Department of Pharmacology & Mitchell Cancer Institute, University of South Alabama, Mobile, AL 36604, United States
| | - Rasha Q Al-Rahahleh
- Department of Pharmacology & Mitchell Cancer Institute, University of South Alabama, Mobile, AL 36604, United States; Department of Pathology and Laboratory Medicine, Warren Alpert Medical School & Legorreta Cancer Center, Brown University, Providence, RI 02912, United States
| | - Aisha H Siddiqui
- Department of Pathology and Laboratory Medicine, Warren Alpert Medical School & Legorreta Cancer Center, Brown University, Providence, RI 02912, United States
| | - Morgan E Andrews
- Department of Pathology and Laboratory Medicine, Warren Alpert Medical School & Legorreta Cancer Center, Brown University, Providence, RI 02912, United States
| | - Wynand P Roos
- Department of Pathology and Laboratory Medicine, Warren Alpert Medical School & Legorreta Cancer Center, Brown University, Providence, RI 02912, United States
| | - Christopher A Koczor
- Department of Pharmacology & Mitchell Cancer Institute, University of South Alabama, Mobile, AL 36604, United States
| | - Joel F Andrews
- Department Biochemistry and Molecular Biology & Mitchell Cancer Institute, University of South Alabama, Mobile, AL 36604, United States
| | - Faisal Hayat
- Department of Pharmacology & Mitchell Cancer Institute, University of South Alabama, Mobile, AL 36604, United States
| | - Marie E Migaud
- Department of Pharmacology & Mitchell Cancer Institute, University of South Alabama, Mobile, AL 36604, United States
| | - Robert W Sobol
- Department of Pharmacology & Mitchell Cancer Institute, University of South Alabama, Mobile, AL 36604, United States; Department of Pathology and Laboratory Medicine, Warren Alpert Medical School & Legorreta Cancer Center, Brown University, Providence, RI 02912, United States.
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Kim HY, Park JS, Jeon BH, Choi HS, Kim CS, Ma SK, Kim SW, Bae EH. Role of APE1/Ref-1 in hydrogen peroxide-induced apoptosis in human renal HK-2 cells. Kidney Res Clin Pract 2024; 43:186-201. [PMID: 37448293 PMCID: PMC11016666 DOI: 10.23876/j.krcp.22.171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 11/02/2022] [Accepted: 11/11/2022] [Indexed: 07/15/2023] Open
Abstract
BACKGROUND Apurinic/apyrimidinic endonuclease 1/redox factor-1 (APE1/Ref-1) is a multipotent protein that plays essential roles in cellular responses to oxidative stress. METHODS To examine the role of APE1/Ref-1 in ischemia-reperfusion (I/R) injuries and hydrogen peroxide (H2O2)-induced renal tubular apoptosis, we studied male C57BL6 mice and human proximal tubular epithelial (HK-2) cells treated with H2O2 at different concentrations. The colocalization of APE1/Ref-1 in the proximal tubule, distal tubule, thick ascending limb, and collecting duct was observed with confocal microscopy. The overexpression of APE1/Ref-1 with knockdown cell lines using an APE1/Ref-1-specific DNA or small interfering RNA (siRNA) was used for the apoptosis assay. The promotor activity of nuclear factor kappa B (NF-κB) was assessed and electrophoretic mobility shift assay was conducted. RESULTS APE1/Ref-1 was predominantly localized to the renal tubule nucleus. In renal I/R injuries, the levels of APE1/Ref-1 protein were increased compared with those in kidneys subjected to sham operations. The overexpression of APE1/Ref-1 in HK-2 cells enhanced the Bax/Bcl-2 ratio as a marker of apoptosis. Conversely, the suppression of APE1/Ref-1 expression by siRNA in 1-mM H2O2-treated HK-2 cells decreased the Bax/Bcl-2 ratio, the phosphorylation of extracellular signal-regulated kinase (ERK) 1/2, p38, c-Jun N-terminal kinase (JNK) 1/2, and NF-κB. In HK-2 cells, the promoter activity of NF-κB increased following H2O2 exposure, and this effect was further enhanced by APE1/Ref-1 transfection. CONCLUSION The inhibition of APE1/Ref-1 with siRNA attenuated H2O2-induced apoptosis through the modulation of mitogen-activated protein kinase pathways mediated by ERK, JNK, and p38 and the nuclear activation of NF-κB and proapoptotic factors.
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Affiliation(s)
- Ha Yeon Kim
- Department of Internal Medicine, Gwangju Veterans Hospital, Gwangju, Republic of Korea
| | - Jung Sun Park
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Byeong Hwa Jeon
- Research Institute of Medical Sciences and Department of Physiology, Chungnam National University College of Medicine, Daejeon, Republic of Korea
| | - Hong Sang Choi
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Chang Seong Kim
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Seong Kwon Ma
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Soo Wan Kim
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Eun Hui Bae
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
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Kim DV, Diatlova EA, Zharkov TD, Melentyev VS, Yudkina AV, Endutkin AV, Zharkov DO. Back-Up Base Excision DNA Repair in Human Cells Deficient in the Major AP Endonuclease, APE1. Int J Mol Sci 2023; 25:64. [PMID: 38203235 PMCID: PMC10778768 DOI: 10.3390/ijms25010064] [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: 11/15/2023] [Revised: 12/15/2023] [Accepted: 12/18/2023] [Indexed: 01/12/2024] Open
Abstract
Apurinic/apyrimidinic (AP) sites are abundant DNA lesions generated both by spontaneous base loss and as intermediates of base excision DNA repair. In human cells, they are normally repaired by an essential AP endonuclease, APE1, encoded by the APEX1 gene. Other enzymes can cleave AP sites by either hydrolysis or β-elimination in vitro, but it is not clear whether they provide the second line of defense in living cells. Here, we studied AP site repairs in APEX1 knockout derivatives of HEK293FT cells using a reporter system based on transcriptional mutagenesis in the enhanced green fluorescent protein gene. Despite an apparent lack of AP site-processing activity in vitro, the cells efficiently repaired the tetrahydrofuran AP site analog resistant to β-elimination. This ability persisted even when the second AP endonuclease homolog, APE2, was also knocked out. Moreover, APEX1 null cells were able to repair uracil, a DNA lesion that is removed via the formation of an AP site. If AP site hydrolysis was chemically blocked, the uracil repair required the presence of NTHL1, an enzyme that catalyzes β-elimination. Our results suggest that human cells possess at least two back-up AP site repair pathways, one of which is NTHL1-dependent.
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Affiliation(s)
- Daria V. Kim
- Siberian Branch of the Russian Academy of Sciences Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentieva Ave., 630090 Novosibirsk, Russia; (D.V.K.); (E.A.D.); (T.D.Z.); (V.S.M.); (A.V.Y.); (A.V.E.)
- Department of Natural Sciences, Novosibirsk State University, 2 Pirogova St., 630090 Novosibirsk, Russia
| | - Evgeniia A. Diatlova
- Siberian Branch of the Russian Academy of Sciences Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentieva Ave., 630090 Novosibirsk, Russia; (D.V.K.); (E.A.D.); (T.D.Z.); (V.S.M.); (A.V.Y.); (A.V.E.)
| | - Timofey D. Zharkov
- Siberian Branch of the Russian Academy of Sciences Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentieva Ave., 630090 Novosibirsk, Russia; (D.V.K.); (E.A.D.); (T.D.Z.); (V.S.M.); (A.V.Y.); (A.V.E.)
| | - Vasily S. Melentyev
- Siberian Branch of the Russian Academy of Sciences Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentieva Ave., 630090 Novosibirsk, Russia; (D.V.K.); (E.A.D.); (T.D.Z.); (V.S.M.); (A.V.Y.); (A.V.E.)
- Department of Natural Sciences, Novosibirsk State University, 2 Pirogova St., 630090 Novosibirsk, Russia
| | - Anna V. Yudkina
- Siberian Branch of the Russian Academy of Sciences Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentieva Ave., 630090 Novosibirsk, Russia; (D.V.K.); (E.A.D.); (T.D.Z.); (V.S.M.); (A.V.Y.); (A.V.E.)
- Department of Natural Sciences, Novosibirsk State University, 2 Pirogova St., 630090 Novosibirsk, Russia
| | - Anton V. Endutkin
- Siberian Branch of the Russian Academy of Sciences Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentieva Ave., 630090 Novosibirsk, Russia; (D.V.K.); (E.A.D.); (T.D.Z.); (V.S.M.); (A.V.Y.); (A.V.E.)
| | - Dmitry O. Zharkov
- Siberian Branch of the Russian Academy of Sciences Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentieva Ave., 630090 Novosibirsk, Russia; (D.V.K.); (E.A.D.); (T.D.Z.); (V.S.M.); (A.V.Y.); (A.V.E.)
- Department of Natural Sciences, Novosibirsk State University, 2 Pirogova St., 630090 Novosibirsk, Russia
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Hsieh MJ, Lin JT, Chuang YC, Lin CC, Lo YS, Ho HY, Chen MK. Limocitrin increases cytotoxicity of KHYG-1 cells against K562 cells by modulating MAPK pathway. ENVIRONMENTAL TOXICOLOGY 2023; 38:2939-2951. [PMID: 37584500 DOI: 10.1002/tox.23929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 07/21/2023] [Accepted: 07/29/2023] [Indexed: 08/17/2023]
Abstract
Natural killer (NK) cells are gaining popularity in the field of cancer immunotherapy. The present study was designed to investigate the effect of a natural flavonol compound limocitrin in increasing cytotoxicity of a permanent NK leukemia cell line KHYG-1 against an aggressive leukemia cell line K562. The findings revealed that limocitrin increased the expressions of cytolytic molecules perforin, granzymes A and B, and granulysin in KHYG-1 cells by inducing phosphorylation of transcription factor CREB, leading to increased lysis of K562 cells. Mechanistically, limocitrin was found to increase the expressions of t-Bid, cleaved caspase 3, and cleaved PARP to induce K562 cell apoptosis. Moreover, limocitrin reduced the expressions of SET and Ape1 to inhibit DNA repair mechanism, leading to caspase-independent K562 cell death. At the molecular level, limocitrin was found to increase the phosphorylation of ERK, p38, and JNK to increase granzyme B expression in KHYG-1 cells. Taken together, the study indicates that limocitrin increases cytotoxicity of NK cells against a range of cancer cells.
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Affiliation(s)
- Ming-Ju Hsieh
- Oral Cancer Research Center, Changhua Christian Hospital, Changhua, Taiwan
- Doctoral Program in Tissue Engineering and Regenerative Medicine, College of Medicine, National Chung Hsing University, Taichung, Taiwan
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan
| | - Jen-Tsun Lin
- Division of Hematology and Oncology, Department of Medicine, Changhua Christian Hospital, Changhua, Taiwan
| | - Yi-Ching Chuang
- Oral Cancer Research Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Chia-Chieh Lin
- Oral Cancer Research Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Yu-Sheng Lo
- Oral Cancer Research Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Hsin-Yu Ho
- Oral Cancer Research Center, Changhua Christian Hospital, Changhua, Taiwan
| | - Mu-Kuan Chen
- Department of Otorhinolaryngology, Head and Neck Surgery, Changhua Christian Hospital, Changhua, Taiwan
- Department of Post-Baccalaureate Medicine, College of Medicine, National Chung Hsing University, Taichung, Taiwan
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Fan C, Gao Y, Sun Y. Integrated multiple-microarray analysis and mendelian randomization to identify novel targets involved in diabetic nephropathy. Front Endocrinol (Lausanne) 2023; 14:1191768. [PMID: 37492198 PMCID: PMC10363738 DOI: 10.3389/fendo.2023.1191768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 06/26/2023] [Indexed: 07/27/2023] Open
Abstract
Background Diabetic nephropathy (DN), which is the main cause of renal failure in end-stage renal disease, is becoming a common chronic renal disease worldwide. Mendelian randomization (MR) is a genetic tool that is widely used to minimize confounding and reverse causation when identifying the causal effects of complex traits. In this study, we conducted an integrated multiple microarray analysis and large-scale plasma proteome MR analysis to identify candidate biomarkers and evaluate the causal effects of prospective therapeutic targets in DN. Methods Five DN gene expression datasets were selected from the Gene Expression Omnibus. The robust rank aggregation (RRA) method was used to integrate differentially expressed genes (DEGs) of glomerular samples between patients with DN and controls, followed by functional enrichment analysis. Protein quantitative trait loci were incorporated from seven different proteomic genome-wide association studies, and genetic association data on DN were obtained from FinnGen (3676 cases and 283,456 controls) for two-sample MR analysis. External validation and clinical correlation were also conducted. Results A total of 82 DEGs (53 upregulated and 29 downregulated) were identified through RRA integrated analysis. The enriched Gene Ontology annotations and Kyoto Encyclopedia of Genes and Genomes pathways of the DEGs were significantly enriched in neutrophil degranulation, neutrophil activation, proteoglycan binding, collagen binding, secretory granule lumen, gluconeogenesis, tricarboxylic acid cycle, and pentose phosphate pathways. MR analysis revealed that the genetically predicted levels of MHC class I polypeptide-related sequence B (MICB), granzyme A (GZMA), cathepsin S (CTSS), chloride intracellular channel protein 5, and ficolin-1 (FCN1) were causally associated with DN risk. Expression validation and clinical correlation analysis showed that MICB, GZMA, FCN1, and insulin-like growth factor 1 may participate in the development of DN, and carbonic anhydrase 2 and lipoprotein lipase may play protective roles in patients with DN. Conclusion Our integrated analysis identified novel biomarkers, including MICB and GZMA, which may help further understand the complicated mechanisms of DN and identify new target pathways for intervention.
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Affiliation(s)
- Chenyu Fan
- Department of Cardiology and Institute of Vascular Medicine, Peking University Third Hospital, Beijing, China
| | - Yuye Gao
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Gastrointestinal Surgery III, Peking University Cancer Hospital & Institute, Beijing, China
| | - Ying Sun
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, Jiangsu, China
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Miner KM, Jamenis AS, Bhatia TN, Clark RN, Rajasundaram D, Sauvaigo S, Mason DM, Posimo JM, Abraham N, DeMarco BA, Hu X, Stetler RA, Chen J, Sanders LH, Luk KC, Leak RK. α-synucleinopathy exerts sex-dimorphic effects on the multipurpose DNA repair/redox protein APE1 in mice and humans. Prog Neurobiol 2022; 216:102307. [PMID: 35710046 PMCID: PMC9514220 DOI: 10.1016/j.pneurobio.2022.102307] [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: 11/03/2021] [Revised: 04/05/2022] [Accepted: 06/10/2022] [Indexed: 11/16/2022]
Abstract
Lewy body disorders are characterized by oxidative damage to DNA and inclusions rich in aggregated forms of α-synuclein. Among other roles, apurinic/apyrimidinic endonuclease 1 (APE1) repairs oxidative DNA damage, and APE1 polymorphisms have been linked to cases of Lewy body disorders. However, the link between APE1 and α-synuclein is unexplored. We report that knockdown or inhibition of APE1 amplified inclusion formation in primary hippocampal cultures challenged with preformed α-synuclein fibrils. Fibril infusions into the mouse olfactory bulb/anterior olfactory nucleus (OB/AON) elicited a modest decrease in APE1 expression in the brains of male mice but an increase in females. Similarly, men with Lewy body disorders displayed lower APE1 expression in the OB and amygdala compared to women. Preformed fibril infusions of the mouse OB/AON induced more robust base excision repair of DNA lesions in females than males. No fibril-mediated loss of APE1 expression was observed in male mice when the antioxidant N-acetylcysteine was added to their diet. These findings reveal a potential sex-biased link between α-synucleinopathy and APE1 in mice and humans. Further studies are warranted to determine how this multifunctional protein modifies α-synuclein inclusions and, conversely, how α-synucleinopathy and biological sex interact to modify APE1.
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Affiliation(s)
- Kristin M Miner
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Anuj S Jamenis
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Tarun N Bhatia
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Rachel N Clark
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Dhivyaa Rajasundaram
- Department of Pediatrics, Rangos Research Center, UPMC Children's Hospital of Pittsburgh, PA 15224, USA
| | | | - Daniel M Mason
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Jessica M Posimo
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Nevil Abraham
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Brett A DeMarco
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Xiaoming Hu
- Department of Neurology, University of Pittsburgh, PA 15213, USA
| | - R Anne Stetler
- Department of Neurology, University of Pittsburgh, PA 15213, USA
| | - Jun Chen
- Department of Neurology, University of Pittsburgh, PA 15213, USA
| | - Laurie H Sanders
- Department of Neurology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Kelvin C Luk
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19147, USA
| | - Rehana K Leak
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA.
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Antonyan L, Ernst C. Putative Roles of SETBP1 Dosage on the SET Oncogene to Affect Brain Development. Front Neurosci 2022; 16:813430. [PMID: 35685777 PMCID: PMC9173722 DOI: 10.3389/fnins.2022.813430] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 04/19/2022] [Indexed: 12/24/2022] Open
Abstract
Mutations in SET BINDING PROTEIN 1 (SETBP1) cause two different clinically distinguishable diseases called Schinzel–Giedion syndrome (SGS) or SETBP1 deficiency syndrome (SDD). Both disorders are disorders of protein dosage, where SGS is caused by decreased rate of protein breakdown due to mutations in a proteosome targeting domain, and SDD is caused by heterozygous loss-of-function mutations leading to haploinsufficiency. While phenotypes of affected individuals support a role for SETBP1 in brain development, little is known about the mechanisms that might underlie this. The binding partner which gave SETBP1 its name is SET and there is extensive literature on this important oncogene in non-neural tissues. Here we describe different molecular complexes in which SET is involved as well as the role of these complexes in brain development. Based on this information, we postulate how SETBP1 protein dosage might influence these SET-containing molecular pathways and affect brain development. We examine the roles of SET and SETBP1 in acetylation inhibition, phosphatase activity, DNA repair, and cell cycle control. This work provides testable hypotheses for how altered SETBP1 protein dosage affects brain development.
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Kim SY, Barnes MA, Sureshchandra S, Menicucci AR, Patel JJ, Messaoudi I, Nair MG. CX3CR1-Expressing Myeloid Cells Regulate Host-Helminth Interaction and Lung Inflammation. Adv Biol (Weinh) 2022; 6:e2101078. [PMID: 35119218 PMCID: PMC8934291 DOI: 10.1002/adbi.202101078] [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: 07/12/2021] [Revised: 12/31/2021] [Indexed: 11/06/2022]
Abstract
Many helminth life cycles, including hookworm, involve a mandatory lung phase, where myeloid and granulocyte subsets interact with the helminth and respond to infection-induced lung injury. To evaluate these innate subsets in Nippostrongylus brasiliensis infection, reporter mice for myeloid cells (CX3CR1GFP ) and granulocytes (PGRPdsRED ) are employed. Nippostrongylus infection induces lung infiltration of reporter cells, including CX3CR1+ myeloid cells and PGRP+ eosinophils. Strikingly, CX3CR1GFP/GFP mice, which are deficient in CX3CR1, are protected from Nippostrongylus infection with reduced weight loss, lung leukocyte infiltration, and worm burden compared to CX3CR1+/+ mice. This protective effect is specific for CX3CR1 as CCR2-deficient mice do not exhibit reduced worm burdens. Nippostrongylus co-culture with lung Ly6C+ monocytes or CD11c+ cells demonstrates that CX3CR1GFP/GFP monocytes secrete more pro-inflammatory cytokines and actively bind the parasites causing reduced motility. RNA sequencing of Ly6C+ or CD11c+ cells shows Nippostrongylus-induced gene expression changes, particularly in monocytes, associated with inflammation, chemotaxis, and extracellular matrix remodeling pathways. Analysis reveals cytotoxic and adhesion molecules as potential effectors against the parasite, such as Gzma and Gzmb, which are elevated in CX3CR1GFP/GFP monocytes. These studies validate a dual innate cell reporter for lung helminth infection and demonstrate that CX3CR1 impairs monocyte-helminth interaction.
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Affiliation(s)
| | | | | | - Andrea R. Menicucci
- Department of Molecular Biology and Biochemistry, School of Biological Sciences, University of California, Irvine, California 92697-3900, United States
| | - Jay J. Patel
- Division of Biomedical Sciences, School of Medicine, University of California Riverside, Riverside, California 92521, United States
| | - Ilhem Messaoudi
- Department of Molecular Biology and Biochemistry, School of Biological Sciences, University of California, Irvine, California 92697-3900, United States
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Oliveira TT, Coutinho LG, de Oliveira LOA, Timoteo ARDS, Farias GC, Agnez-Lima LF. APE1/Ref-1 Role in Inflammation and Immune Response. Front Immunol 2022; 13:793096. [PMID: 35296074 PMCID: PMC8918667 DOI: 10.3389/fimmu.2022.793096] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 02/07/2022] [Indexed: 12/12/2022] Open
Abstract
Apurinic/apyrimidinic endonuclease 1/redox effector factor 1 (APE1/Ref-1) is a multifunctional enzyme that is essential for maintaining cellular homeostasis. APE1 is the major apurinic/apyrimidinic endonuclease in the base excision repair pathway and acts as a redox-dependent regulator of several transcription factors, including NF-κB, AP-1, HIF-1α, and STAT3. These functions render APE1 vital to regulating cell signaling, senescence, and inflammatory pathways. In addition to regulating cytokine and chemokine expression through activation of redox sensitive transcription factors, APE1 participates in other critical processes in the immune response, including production of reactive oxygen species and class switch recombination. Furthermore, through participation in active chromatin demethylation, the repair function of APE1 also regulates transcription of some genes, including cytokines such as TNFα. The multiple functions of APE1 make it an essential regulator of the pathogenesis of several diseases, including cancer and neurological disorders. Therefore, APE1 inhibitors have therapeutic potential. APE1 is highly expressed in the central nervous system (CNS) and participates in tissue homeostasis, and its roles in neurodegenerative and neuroinflammatory diseases have been elucidated. This review discusses known roles of APE1 in innate and adaptive immunity, especially in the CNS, recent evidence of a role in the extracellular environment, and the therapeutic potential of APE1 inhibitors in infectious/immune diseases.
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Affiliation(s)
- Thais Teixeira Oliveira
- Departamento de Biologia Celular e Genética, Universidade Federal do Rio Grande do Norte (UFRN), Natal, Brazil
| | - Leonam Gomes Coutinho
- Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte (IFRN), São Paulo do Potengi, Brazil
| | | | | | - Guilherme Cavalcanti Farias
- Departamento de Biologia Celular e Genética, Universidade Federal do Rio Grande do Norte (UFRN), Natal, Brazil
| | - Lucymara Fassarella Agnez-Lima
- Departamento de Biologia Celular e Genética, Universidade Federal do Rio Grande do Norte (UFRN), Natal, Brazil
- *Correspondence: Lucymara Fassarella Agnez-Lima,
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de Jong LC, Crnko S, ten Broeke T, Bovenschen N. Noncytotoxic functions of killer cell granzymes in viral infections. PLoS Pathog 2021; 17:e1009818. [PMID: 34529743 PMCID: PMC8445437 DOI: 10.1371/journal.ppat.1009818] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Cytotoxic lymphocytes produce granules armed with a set of 5 serine proteases (granzymes (Gzms)), which, together with the pore-forming protein (perforin), serve as a major defense against viral infections in humans. This granule-exocytosis pathway subsumes a well-established mechanism in which target cell death is induced upon perforin-mediated entry of Gzms and subsequent activation of various (apoptosis) pathways. In the past decade, however, a growing body of evidence demonstrated that Gzms also inhibit viral replication and potential reactivation in cell death–independent manners. For example, Gzms can induce proteolysis of viral or host cell proteins necessary for the viral entry, release, or intracellular trafficking, as well as augment pro-inflammatory antiviral cytokine response. In this review, we summarize current evidence for the noncytotoxic mechanisms and roles by which killer cells can use Gzms to combat viral infections, and we discuss the potential thereof for the development of novel therapies.
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Affiliation(s)
- Lisanne C. de Jong
- Radboud University, Nijmegen, the Netherlands
- Department of Pathology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Sandra Crnko
- Department of Pathology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Toine ten Broeke
- Department of Pathology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Niels Bovenschen
- Department of Pathology, University Medical Center Utrecht, Utrecht, the Netherlands
- Center for Translational Immunology, University Medical Center Utrecht, Utrecht, the Netherlands
- * E-mail:
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11
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Kim DV, Kulishova LM, Torgasheva NA, Melentyev VS, Dianov GL, Medvedev SP, Zakian SM, Zharkov DO. Mild phenotype of knockouts of the major apurinic/apyrimidinic endonuclease APEX1 in a non-cancer human cell line. PLoS One 2021; 16:e0257473. [PMID: 34529719 PMCID: PMC8445474 DOI: 10.1371/journal.pone.0257473] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 09/01/2021] [Indexed: 12/26/2022] Open
Abstract
The major human apurinic/apyrimidinic (AP) site endonuclease, APEX1, is a central player in the base excision DNA repair (BER) pathway and has a role in the regulation of DNA binding by transcription factors. In vertebrates, APEX1 knockouts are embryonic lethal, and only a handful of knockout cell lines are known. To facilitate studies of multiple functions of this protein in human cells, we have used the CRISPR/Cas9 system to knock out the APEX1 gene in a widely used non-cancer hypotriploid HEK 293FT cell line. Two stable knockout lines were obtained, one carrying two single-base deletion alleles and one single-base insertion allele in exon 3, another homozygous in the single-base insertion allele. Both mutations cause a frameshift that leads to premature translation termination before the start of the protein's catalytic domain. Both cell lines totally lacked the APEX1 protein and AP site-cleaving activity, and showed significantly lower levels of the APEX1 transcript. The APEX1-null cells were unable to support BER on uracil- or AP site-containing substrates. Phenotypically, they showed a moderately increased sensitivity to methyl methanesulfonate (MMS; ~2-fold lower EC50 compared with wild-type cells), and their background level of natural AP sites detected by the aldehyde-reactive probe was elevated ~1.5-2-fold. However, the knockout lines retained a nearly wild-type sensitivity to oxidizing agents hydrogen peroxide and potassium bromate. Interestingly, despite the increased MMS cytotoxicity, we observed no additional increase in AP sites in knockout cells upon MMS treatment, which could indicate their conversion into more toxic products in the absence of repair. Overall, the relatively mild cell phenotype in the absence of APEX1-dependent BER suggests that mammalian cells possess mechanisms of tolerance or alternative repair of AP sites. The knockout derivatives of the extensively characterized HEK 293FT cell line may provide a valuable tool for studies of APEX1 in DNA repair and beyond.
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Affiliation(s)
- Daria V. Kim
- Department of Natural Sciences, Novosibirsk State University, Novosibirsk, Russia
- SB RAS Institute of Chemical Biology and Fundamental Medicine, Novosibirsk, Russia
| | - Liliya M. Kulishova
- SB RAS Institute of Chemical Biology and Fundamental Medicine, Novosibirsk, Russia
| | | | - Vasily S. Melentyev
- Department of Natural Sciences, Novosibirsk State University, Novosibirsk, Russia
- SB RAS Institute of Cytology and Genetics, Novosibirsk, Russia
| | - Grigory L. Dianov
- Department of Natural Sciences, Novosibirsk State University, Novosibirsk, Russia
- SB RAS Institute of Cytology and Genetics, Novosibirsk, Russia
- Department of Oncology, MRC Oxford Institute for Radiation Oncology, University of Oxford, Oxford, United Kingdom
| | | | - Suren M. Zakian
- SB RAS Institute of Cytology and Genetics, Novosibirsk, Russia
| | - Dmitry O. Zharkov
- Department of Natural Sciences, Novosibirsk State University, Novosibirsk, Russia
- SB RAS Institute of Chemical Biology and Fundamental Medicine, Novosibirsk, Russia
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12
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Gampala S, Shah F, Lu X, Moon HR, Babb O, Umesh Ganesh N, Sandusky G, Hulsey E, Armstrong L, Mosely AL, Han B, Ivan M, Yeh JRJ, Kelley MR, Zhang C, Fishel ML. Ref-1 redox activity alters cancer cell metabolism in pancreatic cancer: exploiting this novel finding as a potential target. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2021; 40:251. [PMID: 34376225 PMCID: PMC8353735 DOI: 10.1186/s13046-021-02046-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Accepted: 07/18/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND Pancreatic cancer is a complex disease with a desmoplastic stroma, extreme hypoxia, and inherent resistance to therapy. Understanding the signaling and adaptive response of such an aggressive cancer is key to making advances in therapeutic efficacy. Redox factor-1 (Ref-1), a redox signaling protein, regulates the conversion of several transcription factors (TFs), including HIF-1α, STAT3 and NFκB from an oxidized to reduced state leading to enhancement of their DNA binding. In our previously published work, knockdown of Ref-1 under normoxia resulted in altered gene expression patterns on pathways including EIF2, protein kinase A, and mTOR. In this study, single cell RNA sequencing (scRNA-seq) and proteomics were used to explore the effects of Ref-1 on metabolic pathways under hypoxia. METHODS scRNA-seq comparing pancreatic cancer cells expressing less than 20% of the Ref-1 protein was analyzed using left truncated mixture Gaussian model and validated using proteomics and qRT-PCR. The identified Ref-1's role in mitochondrial function was confirmed using mitochondrial function assays, qRT-PCR, western blotting and NADP assay. Further, the effect of Ref-1 redox function inhibition against pancreatic cancer metabolism was assayed using 3D co-culture in vitro and xenograft studies in vivo. RESULTS Distinct transcriptional variation in central metabolism, cell cycle, apoptosis, immune response, and genes downstream of a series of signaling pathways and transcriptional regulatory factors were identified in Ref-1 knockdown vs Scrambled control from the scRNA-seq data. Mitochondrial DEG subsets downregulated with Ref-1 knockdown were significantly reduced following Ref-1 redox inhibition and more dramatically in combination with Devimistat in vitro. Mitochondrial function assays demonstrated that Ref-1 knockdown and Ref-1 redox signaling inhibition decreased utilization of TCA cycle substrates and slowed the growth of pancreatic cancer co-culture spheroids. In Ref-1 knockdown cells, a higher flux rate of NADP + consuming reactions was observed suggesting the less availability of NADP + and a higher level of oxidative stress in these cells. In vivo xenograft studies demonstrated that tumor reduction was potent with Ref-1 redox inhibitor similar to Devimistat. CONCLUSION Ref-1 redox signaling inhibition conclusively alters cancer cell metabolism by causing TCA cycle dysfunction while also reducing the pancreatic tumor growth in vitro as well as in vivo.
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Affiliation(s)
- Silpa Gampala
- Department of Pediatrics and Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Fenil Shah
- Department of Pediatrics and Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Xiaoyu Lu
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,Department of Biohealth Informatics, IUPUI, Indianapolis, IN, 46202, USA
| | - Hye-Ran Moon
- School of Mechanical Engineering, Purdue University, West Lafayette, IN, 47906, USA
| | - Olivia Babb
- Department of Pediatrics and Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Nikkitha Umesh Ganesh
- Cardiovascular Research Center, Massachusetts General Hospital, Charlestown, MA, 02115, USA.,Department of Medicine, Harvard Medical School, Boston, MA, 02115, USA
| | - George Sandusky
- Department of Pathology and Laboratory Medicine, Indiana University School of Medicine , Indianapolis, IN, 46202, USA.,Indiana University Simon Comprehensive Cancer Center, Indiana University School of Medicine, 1044 W Walnut St. R4-321, Indianapolis, IN, 46202, USA
| | - Emily Hulsey
- Department of Pathology and Laboratory Medicine, Indiana University School of Medicine , Indianapolis, IN, 46202, USA
| | - Lee Armstrong
- Department of Pediatrics and Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Amber L Mosely
- Indiana University Simon Comprehensive Cancer Center, Indiana University School of Medicine, 1044 W Walnut St. R4-321, Indianapolis, IN, 46202, USA.,Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Bumsoo Han
- School of Mechanical Engineering, Purdue University, West Lafayette, IN, 47906, USA.,Purdue Center for Cancer Research, Purdue University, West Lafayette, IN, 47906, USA
| | - Mircea Ivan
- Indiana University Simon Comprehensive Cancer Center, Indiana University School of Medicine, 1044 W Walnut St. R4-321, Indianapolis, IN, 46202, USA.,Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Jing-Ruey Joanna Yeh
- Cardiovascular Research Center, Massachusetts General Hospital, Charlestown, MA, 02115, USA.,Department of Medicine, Harvard Medical School, Boston, MA, 02115, USA
| | - Mark R Kelley
- Department of Pediatrics and Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,Indiana University Simon Comprehensive Cancer Center, Indiana University School of Medicine, 1044 W Walnut St. R4-321, Indianapolis, IN, 46202, USA.,Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Chi Zhang
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, 46202, USA. .,Department of Biohealth Informatics, IUPUI, Indianapolis, IN, 46202, USA. .,Indiana University Simon Comprehensive Cancer Center, Indiana University School of Medicine, 1044 W Walnut St. R4-321, Indianapolis, IN, 46202, USA.
| | - Melissa L Fishel
- Department of Pediatrics and Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, 46202, USA. .,Indiana University Simon Comprehensive Cancer Center, Indiana University School of Medicine, 1044 W Walnut St. R4-321, Indianapolis, IN, 46202, USA. .,Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
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13
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Liu TC, Guo KW, Chu JW, Hsiao YY. Understanding APE1 cellular functions by the structural preference of exonuclease activities. Comput Struct Biotechnol J 2021; 19:3682-3691. [PMID: 34285771 PMCID: PMC8258793 DOI: 10.1016/j.csbj.2021.06.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Revised: 06/21/2021] [Accepted: 06/22/2021] [Indexed: 12/17/2022] Open
Abstract
Mammalian apurinic/apyrimidinic (AP) endonuclease 1 (APE1) has versatile enzymatic functions, including redox, endonuclease, and exonuclease activities. APE1 is thus broadly associated with pathways in DNA repair, cancer cell growth, and drug resistance. Unlike its AP site-specific endonuclease activity in Base excision repair (BER), the 3′-5′ exonucleolytic cleavage of APE1 using the same active site exhibits complex substrate selection patterns, which are key to the biological functions. This work aims to integrate molecular structural information and biocatalytic properties to deduce the substrate recognition mechanism of APE1 as an exonuclease and make connection to its diverse functionalities in the cell. In particular, an induced space-filling model emerges in which a bridge-like structure is formed by Arg177 and Met270 (RM bridge) upon substrate binding, causing the active site to adopt a long and narrow product pocket for hosting the leaving group of an AP site or the 3′-end nucleotide. Rather than distinguishing bases as other exonucleases, the hydrophobicity and steric hindrance due to the APE1 product pocket provides selectivity for substrate structures, such as matched or mismatched blunt-ended dsDNA, recessed dsDNA, gapped dsDNA, and nicked dsDNA with 3′-end overhang shorter than 2 nucleotides. These dsDNAs are similar to the native substrates in BER proofreading, BER for trinucleotide repeats (TNR), Nucleotide incision repair (NIR), DNA single-strand breaks (SSB), SSB with damaged bases, and apoptosis. Integration of in vivo studies, in vitro biochemical assays, and structural analysis is thus essential for linking the APE1 exonuclease activity to the specific roles in cellular functions.
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Affiliation(s)
- Tung-Chang Liu
- Institute of Molecular Medicine and Bioengineering, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan.,Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu, Taiwan 30068, Taiwan
| | - Kai-Wei Guo
- Institute of Molecular Medicine and Bioengineering, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan.,Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu, Taiwan 30068, Taiwan
| | - Jhih-Wei Chu
- Institute of Molecular Medicine and Bioengineering, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan.,Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu, Taiwan 30068, Taiwan.,Institute of Bioinformatics and Systems Biology, National Yang Ming Chiao Tung University, Hsinchu, 30068, Taiwan.,Center For Intelligent Drug Systems and Smart Bio-devices (IDSB), National Yang Ming Chiao Tung University, Hsinchu, Taiwan
| | - Yu-Yuan Hsiao
- Institute of Molecular Medicine and Bioengineering, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan.,Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu, Taiwan 30068, Taiwan.,Institute of Bioinformatics and Systems Biology, National Yang Ming Chiao Tung University, Hsinchu, 30068, Taiwan.,Center For Intelligent Drug Systems and Smart Bio-devices (IDSB), National Yang Ming Chiao Tung University, Hsinchu, Taiwan.,Drug Development and Value Creation Research Center, Center for Cancer Research, Kaohsiung Medical University, Kaohsiung, Taiwan
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14
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Molecular Mechanisms Regulating the DNA Repair Protein APE1: A Focus on Its Flexible N-Terminal Tail Domain. Int J Mol Sci 2021; 22:ijms22126308. [PMID: 34208390 PMCID: PMC8231204 DOI: 10.3390/ijms22126308] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 06/08/2021] [Accepted: 06/09/2021] [Indexed: 02/06/2023] Open
Abstract
APE1 (DNA (apurinic/apyrimidinic site) endonuclease 1) is a key enzyme of one of the major DNA repair routes, the BER (base excision repair) pathway. APE1 fulfils additional functions, acting as a redox regulator of transcription factors and taking part in RNA metabolism. The mechanisms regulating APE1 are still being deciphered. Structurally, human APE1 consists of a well-characterized globular catalytic domain responsible for its endonuclease activity, preceded by a conformationally flexible N-terminal extension, acquired along evolution. This N-terminal tail appears to play a prominent role in the modulation of APE1 and probably in BER coordination. Thus, it is primarily involved in mediating APE1 localization, post-translational modifications, and protein–protein interactions, with all three factors jointly contributing to regulate the enzyme. In this review, recent insights on the regulatory role of the N-terminal region in several aspects of APE1 function are covered. In particular, interaction of this region with nucleophosmin (NPM1) might modulate certain APE1 activities, representing a paradigmatic example of the interconnection between various regulatory factors.
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15
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Mohr L, Toufektchan E, von Morgen P, Chu K, Kapoor A, Maciejowski J. ER-directed TREX1 limits cGAS activation at micronuclei. Mol Cell 2021; 81:724-738.e9. [PMID: 33476576 PMCID: PMC7897315 DOI: 10.1016/j.molcel.2020.12.037] [Citation(s) in RCA: 94] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 11/18/2020] [Accepted: 12/18/2020] [Indexed: 02/06/2023]
Abstract
Micronuclei are aberrant nuclear compartments that can form as a result of chromosome mis-segregation. Frequent loss of micronuclear envelope integrity exposes DNA to the cytoplasm, leading to chromosome fragmentation and immune activation. Here, we use micronuclei purification to show that the endoplasmic reticulum (ER)-associated nuclease TREX1 inhibits cGAS activation at micronuclei by degrading micronuclear DNA upon micronuclear envelope rupture. We demonstrate that the ER accesses ruptured micronuclei and plays a critical role in enabling TREX1 nucleolytic attack. TREX1 mutations, previously implicated in immune disease, untether TREX1 from the ER, disrupt TREX1 localization to micronuclei, diminish micronuclear DNA damage, and enhance cGAS activation. These results establish ER-directed resection of micronuclear DNA by TREX1 as a critical regulator of cytosolic DNA sensing in chromosomally unstable cells and provide a mechanistic basis for the importance of TREX1 ER tethering in preventing autoimmunity.
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Affiliation(s)
- Lisa Mohr
- Molecular Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Eléonore Toufektchan
- Molecular Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Patrick von Morgen
- Molecular Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Kevan Chu
- Molecular Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Aakanksha Kapoor
- Molecular Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - John Maciejowski
- Molecular Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
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16
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Liu TC, Lin CT, Chang KC, Guo KW, Wang S, Chu JW, Hsiao YY. APE1 distinguishes DNA substrates in exonucleolytic cleavage by induced space-filling. Nat Commun 2021; 12:601. [PMID: 33504804 PMCID: PMC7841161 DOI: 10.1038/s41467-020-20853-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 12/22/2020] [Indexed: 11/09/2022] Open
Abstract
The exonuclease activity of Apurinic/apyrimidinic endonuclease 1 (APE1) is responsible for processing matched/mismatched terminus in various DNA repair pathways and for removing nucleoside analogs associated with drug resistance. To fill in the gap of structural basis for exonucleolytic cleavage, we determine the APE1-dsDNA complex structures displaying end-binding. As an exonuclease, APE1 does not show base preference but can distinguish dsDNAs with different structural features. Integration with assaying enzyme activity and binding affinity for a variety of substrates reveals for the first time that both endonucleolytic and exonucleolytic cleavage can be understood by an induced space-filling model. Binding dsDNA induces RM (Arg176 and Met269) bridge that defines a long and narrow product pocket for exquisite machinery of substrate selection. Our study paves the way to comprehend end-processing of dsDNA in the cell and the drug resistance relating to APE1.
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Affiliation(s)
- Tung-Chang Liu
- Institute of Molecular Medicine and Bioengineering, National Chiao Tung University, Hsinchu, 30068, Taiwan.,Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, 30068, Taiwan
| | - Chun-Ting Lin
- Master's and Doctoral Degree Program for Science and Technology of Accelerator Light Sources, National Chiao Tung University, Hsinchu, 30068, Taiwan
| | - Kai-Cheng Chang
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, 30068, Taiwan
| | - Kai-Wei Guo
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, 30068, Taiwan
| | - Shuying Wang
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan, Taiwan.,Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Department of Biotechnology and Bioindustry Sciences, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan, Taiwan
| | - Jhih-Wei Chu
- Institute of Molecular Medicine and Bioengineering, National Chiao Tung University, Hsinchu, 30068, Taiwan.,Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, 30068, Taiwan.,Institute of Bioinformatics and Systems Biology, National Chiao Tung University, Hsinchu, 30068, Taiwan.,Center For Intelligent Drug Systems and Smart Bio-devices (IDS2B), National Chiao Tung University, Hsinchu, Taiwan
| | - Yu-Yuan Hsiao
- Institute of Molecular Medicine and Bioengineering, National Chiao Tung University, Hsinchu, 30068, Taiwan. .,Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, 30068, Taiwan. .,Master's and Doctoral Degree Program for Science and Technology of Accelerator Light Sources, National Chiao Tung University, Hsinchu, 30068, Taiwan. .,Institute of Bioinformatics and Systems Biology, National Chiao Tung University, Hsinchu, 30068, Taiwan. .,Center For Intelligent Drug Systems and Smart Bio-devices (IDS2B), National Chiao Tung University, Hsinchu, Taiwan. .,Drug Development and Value Creation Research Center, Center for Cancer Research, Kaohsiung Medical University, Kaohsiung, Taiwan.
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17
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Tsuchiya K. Switching from Apoptosis to Pyroptosis: Gasdermin-Elicited Inflammation and Antitumor Immunity. Int J Mol Sci 2021; 22:E426. [PMID: 33406603 PMCID: PMC7794676 DOI: 10.3390/ijms22010426] [Citation(s) in RCA: 147] [Impact Index Per Article: 49.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/27/2020] [Accepted: 12/28/2020] [Indexed: 12/16/2022] Open
Abstract
Pyroptosis is a necrotic form of regulated cell death. Gasdermines (GSDMs) are a family of intracellular proteins that execute pyroptosis. While GSDMs are expressed as inactive forms, certain proteases proteolytically activate them. The N-terminal fragments of GSDMs form pores in the plasma membrane, leading to osmotic cell lysis. Pyroptotic cells release pro-inflammatory molecules into the extracellular milieu, thereby eliciting inflammation and immune responses. Recent studies have significantly advanced our knowledge of the mechanisms and physiological roles of pyroptosis. GSDMs are activated by caspases and granzymes, most of which can also induce apoptosis in different situations, for example where the expression of GSDMs is too low to cause pyroptosis; that is, caspase/granzyme-induced apoptosis can be switched to pyroptosis by the expression of GSDMs. Pyroptosis appears to facilitate the killing of tumor cells by cytotoxic lymphocytes, and it may also reprogram the tumor microenvironment to an immunostimulatory state. Understanding pyroptosis may help the development of cancer immunotherapy. In this review article, recent findings on the mechanisms and roles of pyroptosis are introduced. The effectiveness and limitations of pyroptosis in inducing antitumor immunity are also discussed.
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Affiliation(s)
- Kohsuke Tsuchiya
- Division of Immunology and Molecular Biology, Cancer Research Institute, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan; ; Tel.: +81-76-264-6721
- Institute for Frontier Science Initiative (InFiniti), Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
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18
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Rchiad Z, Haidar M, Ansari HR, Tajeri S, Mfarrej S, Ben Rached F, Kaushik A, Langsley G, Pain A. Novel tumour suppressor roles for GZMA and RASGRP1 in Theileria annulata-transformed macrophages and human B lymphoma cells. Cell Microbiol 2020; 22:e13255. [PMID: 32830401 PMCID: PMC7685166 DOI: 10.1111/cmi.13255] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 08/03/2020] [Accepted: 08/07/2020] [Indexed: 12/22/2022]
Abstract
Theileria annulata is a tick-transmitted apicomplexan parasite that infects and transforms bovine leukocytes into disseminating tumours that cause a disease called tropical theileriosis. Using comparative transcriptomics we identified genes transcriptionally perturbed during Theileria-induced leukocyte transformation. Dataset comparisons highlighted a small set of genes associated with Theileria-transformed leukocyte dissemination. The roles of Granzyme A (GZMA) and RAS guanyl-releasing protein 1 (RASGRP1) were verified by CRISPR/Cas9-mediated knockdown. Knocking down expression of GZMA and RASGRP1 in attenuated macrophages led to a regain in their dissemination in Rag2/γC mice confirming their role as dissemination suppressors in vivo. We further evaluated the roles of GZMA and RASGRP1 in human B lymphomas by comparing the transcriptome of 934 human cancer cell lines to that of Theileria-transformed bovine host cells. We confirmed dampened dissemination potential of human B lymphomas that overexpress GZMA and RASGRP1. Our results provide evidence that GZMA and RASGRP1 have a novel tumour suppressor function in both T. annulata-infected bovine host leukocytes and in human B lymphomas.
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Affiliation(s)
- Zineb Rchiad
- Pathogen Genomics Laboratory, BESE Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.,Laboratoire de Biologie Comparative des Apicomplexes, Faculté de Médecine, Université Paris Descartes - Sorbonne Paris Cité, Paris, France.,INSERM U1016, CNRS UMR8104, Cochin Institute, Paris, France.,Centre de Coalition, Innovation, et de prévention des Epidémies au Maroc (CIPEM), Mohammed VI Polytechnic University (UM6P), Ben Guerir, Morocco
| | - Malak Haidar
- Pathogen Genomics Laboratory, BESE Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.,Laboratoire de Biologie Comparative des Apicomplexes, Faculté de Médecine, Université Paris Descartes - Sorbonne Paris Cité, Paris, France.,INSERM U1016, CNRS UMR8104, Cochin Institute, Paris, France
| | - Hifzur Rahman Ansari
- Pathogen Genomics Laboratory, BESE Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.,King Abdullah International Medical Research Center (KAIMRC), King Abdulaziz Medical City, Ministry of National Guard Health Affairs, Jeddah, Saudi Arabia
| | - Shahin Tajeri
- Laboratoire de Biologie Comparative des Apicomplexes, Faculté de Médecine, Université Paris Descartes - Sorbonne Paris Cité, Paris, France.,INSERM U1016, CNRS UMR8104, Cochin Institute, Paris, France
| | - Sara Mfarrej
- Pathogen Genomics Laboratory, BESE Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Fathia Ben Rached
- Pathogen Genomics Laboratory, BESE Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Abhinav Kaushik
- Pathogen Genomics Laboratory, BESE Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Gordon Langsley
- Laboratoire de Biologie Comparative des Apicomplexes, Faculté de Médecine, Université Paris Descartes - Sorbonne Paris Cité, Paris, France.,INSERM U1016, CNRS UMR8104, Cochin Institute, Paris, France
| | - Arnab Pain
- Pathogen Genomics Laboratory, BESE Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.,Global Station for Zoonosis Control, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo, Japan
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19
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SAM50, a side door to the mitochondria: The case of cytotoxic proteases. Pharmacol Res 2020; 160:105196. [PMID: 32919042 DOI: 10.1016/j.phrs.2020.105196] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Revised: 08/26/2020] [Accepted: 09/03/2020] [Indexed: 12/21/2022]
Abstract
SAM50, a 7-8 nm diameter β-barrel channel of the mitochondrial outer membrane, is the central channel of the sorting and assembly machinery (SAM) complex involved in the biogenesis of β-barrel proteins. Interestingly, SAM50 is not known to have channel translocase activity; however, we have recently found that this channel is necessary and sufficient for mitochondrial entry of cytotoxic proteases. Cytotoxic lymphocytes eliminate cells that pose potential hazards, such as virus- and bacteria-infected cells as well as cancer cells. They induce cell death following the delivery of granzyme cytotoxic proteases into the cytosol of the target cell. Although granzyme A and granzyme B (GA and GB), the best characterized of the five human granzymes, trigger very distinct apoptotic cascades, they share the ability to directly target the mitochondria. GA and GB do not have a mitochondrial targeting signal, yet they enter the target cell mitochondria to disrupt respiratory chain complex I and induce mitochondrial reactive oxygen species (ROS)-dependent cell death. We found that granzyme mitochondrial entry requires SAM50 and the translocase of the inner membrane 22 (TIM22). Preventing granzymes' mitochondrial entry compromises their cytotoxicity, indicating that this event is unexpectedly an important step for cell death. Although mitochondria are best known for their roles in cell metabolism and energy conversion, these double-membrane organelles are also involved in Ca2+ homeostasis, metabolite transport, cell cycle regulation, cell signaling, differentiation, stress response, redox homeostasis, aging, and cell death. This multiplicity of functions is matched with the complexity and plasticity of the mitochondrial proteome as well as the organelle's morphological and structural versatility. Indeed, mitochondria are extremely dynamic and undergo fusion and fission events in response to diverse cellular cues. In humans, there are 1500 different mitochondrial proteins, the vast majority of which are encoded in the nuclear genome and translated by cytosolic ribosomes, after which they must be imported and properly addressed to the right mitochondrial compartment. To this end, mitochondria are equipped with a very sophisticated and highly specific protein import machinery. The latter is centered on translocase complexes embedded in the outer and inner mitochondrial membranes working along five different import pathways. We will briefly describe these import pathways to put into perspective our finding regarding the ability of granzymes to enter the mitochondria.
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20
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van Daalen KR, Reijneveld JF, Bovenschen N. Modulation of Inflammation by Extracellular Granzyme A. Front Immunol 2020; 11:931. [PMID: 32508827 PMCID: PMC7248576 DOI: 10.3389/fimmu.2020.00931] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 04/21/2020] [Indexed: 12/21/2022] Open
Abstract
Granzyme A (GrA) has long been recognized as one of the key players in the induction of cell death of neoplastic, foreign or infected cells after granule delivery by cytotoxic cells. While the cytotoxic potential of GrA is controversial in current literature, accumulating evidence now indicates roles for extracellular GrA in modulating inflammation and inflammatory diseases. This paper aims to explore the literature presenting current knowledge on GrA as an extracellular modulator of inflammation by summarizing (i) the presence and role of extracellular GrA in several inflammatory diseases, and (ii) the potential molecular mechanisms of extracellular GrA in augmenting inflammation.
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Affiliation(s)
- Kim R. van Daalen
- Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, Cambridge, United Kingdom
| | | | - Niels Bovenschen
- Department of Pathology, University Medical Center Utrecht, Utrecht, Netherlands
- Center for Translational Immunology, University Medical Center Utrecht, Utrecht, Netherlands
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21
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Cleavage of the APE1 N-Terminal Domain in Acute Myeloid Leukemia Cells Is Associated with Proteasomal Activity. Biomolecules 2020; 10:biom10040531. [PMID: 32244430 PMCID: PMC7226146 DOI: 10.3390/biom10040531] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 03/27/2020] [Accepted: 03/30/2020] [Indexed: 02/02/2023] Open
Abstract
Apurinic/apyrimidinic endonuclease 1 (APE1), the main mammalian AP-endonuclease for the resolution of DNA damages through the base excision repair (BER) pathway, acts as a multifunctional protein in different key cellular processes. The signals to ensure temporo-spatial regulation of APE1 towards a specific function are still a matter of debate. Several studies have suggested that post-translational modifications (PTMs) act as dynamic molecular mechanisms for controlling APE1 functionality. Interestingly, the N-terminal region of APE1 is a disordered portion functioning as an interface for protein binding, as an acceptor site for PTMs and as a target of proteolytic cleavage. We previously demonstrated a cytoplasmic accumulation of truncated APE1 in acute myeloid leukemia (AML) cells in association with a mutated form of nucleophosmin having aberrant cytoplasmic localization (NPM1c+). Here, we mapped the proteolytic sites of APE1 in AML cells at Lys31 and Lys32 and showed that substitution of Lys27, 31, 32 and 35 with alanine impairs proteolysis. We found that the loss of the APE1 N-terminal domain in AML cells is dependent on the proteasome, but not on granzyme A/K as described previously. The present work identified the proteasome as a contributing machinery involved in APE1 cleavage in AML cells, suggesting that acetylation can modulate this process.
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22
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Kołt S, Janiszewski T, Kaiserman D, Modrzycka S, Snipas SJ, Salvesen G, Dra G M, Bird PI, Kasperkiewicz P. Detection of Active Granzyme A in NK92 Cells with Fluorescent Activity-Based Probe. J Med Chem 2020; 63:3359-3369. [PMID: 32142286 PMCID: PMC7590976 DOI: 10.1021/acs.jmedchem.9b02042] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
![]()
Cytotoxic
T-lymphocytes (CTLs) and natural killer cells (NKs) kill
compromised cells to defend against tumor and viral infections. Both
effector cell types use multiple strategies to induce target cell
death including Fas/CD95 activation and the release of perforin and
a group of lymphocyte granule serine proteases called granzymes. Granzymes
have relatively broad and overlapping substrate specificities and
may hydrolyze a wide range of peptidic epitopes; it is therefore challenging
to identify their natural and synthetic substrates and to distinguish
their localization and functions. Here, we present a specific and
potent substrate, an inhibitor, and an activity-based probe of Granzyme
A (GrA) that can be used to follow functional GrA in cells.
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Affiliation(s)
- Sonia Kołt
- Wrocław University of Science and Technology, Department of Chemical Biology and Bioimaging, Wyb. Wyspiańskiego 29, 50-370 Wroclaw, Poland
| | - Tomasz Janiszewski
- Wrocław University of Science and Technology, Department of Chemical Biology and Bioimaging, Wyb. Wyspiańskiego 29, 50-370 Wroclaw, Poland
| | - Dion Kaiserman
- Monash University, Monash Biomedicine Discovery Institute, Department of Biochemistry and Molecular Biology, 23 Innovation Walk, Clayton, VIC 3800, Australia
| | - Sylwia Modrzycka
- Wrocław University of Science and Technology, Department of Chemical Biology and Bioimaging, Wyb. Wyspiańskiego 29, 50-370 Wroclaw, Poland
| | - Scott J Snipas
- NCI-designated Cancer Center, Sanford-Burnham Prebys Medical Discovery Institute, La Jolla, California 92037, United States
| | - Guy Salvesen
- NCI-designated Cancer Center, Sanford-Burnham Prebys Medical Discovery Institute, La Jolla, California 92037, United States
| | - Marcin Dra G
- Wrocław University of Science and Technology, Department of Chemical Biology and Bioimaging, Wyb. Wyspiańskiego 29, 50-370 Wroclaw, Poland.,NCI-designated Cancer Center, Sanford-Burnham Prebys Medical Discovery Institute, La Jolla, California 92037, United States
| | - Phillip I Bird
- Monash University, Monash Biomedicine Discovery Institute, Department of Biochemistry and Molecular Biology, 23 Innovation Walk, Clayton, VIC 3800, Australia
| | - Paulina Kasperkiewicz
- Wrocław University of Science and Technology, Department of Chemical Biology and Bioimaging, Wyb. Wyspiańskiego 29, 50-370 Wroclaw, Poland
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23
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Reading Targeted DNA Damage in the Active Demethylation Pathway: Role of Accessory Domains of Eukaryotic AP Endonucleases and Thymine-DNA Glycosylases. J Mol Biol 2020:S0022-2836(19)30720-X. [DOI: 10.1016/j.jmb.2019.12.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 11/24/2019] [Accepted: 12/05/2019] [Indexed: 01/07/2023]
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24
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Soh JE, Abu N, Sagap I, Mazlan L, Yahaya A, Mustangin M, Khoo TS, Saidin S, Ishak M, Ab Mutalib NS, Jamal R. Validation of immunogenic PASD1 peptides against HLA-A*24:02 colorectal cancer. Immunotherapy 2019; 11:1205-1219. [PMID: 31478431 DOI: 10.2217/imt-2019-0073] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Colorectal cancer is the third commonest malignancy in Asia including Malaysia. The immunogenic cancer-testis antigens, which are expressed in a variety of cancers but with limited expression in normal tissues except the testis, represent an attractive approach to improve treatment options for colorectal cancer. We aimed to validate four PASD1 peptides as the immunotherapeutic targets in colorectal cancer. First, PASD1 mRNA and protein expression were determined via real-time polymerase chain reaction (RT-PCR) and immunohistochemistry. The PASD1 peptides specific to HLA-A*24:02 were investigated using IFN-y-ELISpot assay, followed by the cytolytic and granzyme-B-ELISpot assays to analyze the cytolytic effects of CD8+ T cells. Gene and protein expressions of PASD1 were detected in 20% and 17.3% of colorectal cancer samples, respectively. PASD1(4) peptide was shown to be immunogenic in colorectal cancer samples. CD8+ T cells raised against PASD1(4) peptide were able to lyze HLA-A*24:02+ PASD1+ cells. Our results reveal that PASD1(4) peptide represents a potential target for colorectal cancer.
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Affiliation(s)
- Joanne Ec Soh
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Nadiah Abu
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Ismail Sagap
- Department of Surgery, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Luqman Mazlan
- Department of Surgery, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Azyani Yahaya
- Department of Pathology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Muaatamarulain Mustangin
- Department of Pathology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Tze S Khoo
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Sazuita Saidin
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Muhiddin Ishak
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Nurul S Ab Mutalib
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Rahman Jamal
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
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25
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Hu X, Zhong Y, Lambers TT, Jiang W. Anti-inflammatory activity of extensively hydrolyzed casein is mediated by granzyme B. Inflamm Res 2019; 68:715-722. [PMID: 31168680 DOI: 10.1007/s00011-019-01254-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 05/23/2019] [Accepted: 05/28/2019] [Indexed: 11/28/2022] Open
Abstract
OBJECTIVE Nutritional factors such as extensively hydrolyzed casein (eHC) have been proposed to exert anti-inflammatory activity and affect clinical outcomes such as tolerance development in cow's milk allergy. Granzyme B (GrB) induces apoptosis in target cells and also controls the inflammatory response. Whether eHC could affect the activity of granzyme B and play a role in GrB-mediated inflammatory responses in vitro was unknown. METHODS The activity of GrB was measured using the substrate Ac-IEPD-pNA. Inflammatory responses were induced with GrB in HCT-8 and THP-1 cells, and pro-inflammatory cytokines were determined at the transcriptional and protein level. RESULTS GrB could induce the expression of IL-1β in HCT-8 cells, and IL-8 and MCP-1 in THP-1 cells, respectively. Interestingly, GrB acted synergistically on LPS-induced inflammation in HCT-8 cells and eHC reduced pro-inflammatory responses in both GrB and LPS-mediated inflammation. Further analyses revealed that eHC could inhibit the biological activities and cytotoxic activities of GrB and then could reduce GrB-mediated inflammatory response. CONCLUSION The results from the current study suggest that anti-inflammatory activity of extensively hydrolyzed casein is, to a certain extent, mediated through modulation of granzyme B activity and responses.
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Affiliation(s)
- Xuefei Hu
- Shanghai Key Laboratory of Regulatory Biology, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Yan Zhong
- Global Discovery Department, Mead Johnson Pediatric Nutrition Institute, Middenkampweg 2, 6545 CJ, Nijmegen, The Netherlands
| | - Tim T Lambers
- Global Discovery Department, Mead Johnson Pediatric Nutrition Institute, Middenkampweg 2, 6545 CJ, Nijmegen, The Netherlands
| | - Wenzheng Jiang
- Shanghai Key Laboratory of Regulatory Biology, School of Life Sciences, East China Normal University, Shanghai, 200241, China.
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26
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SET protein accumulation prevents cell death in head and neck squamous cell carcinoma through regulation of redox state and autophagy. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2019; 1866:623-637. [DOI: 10.1016/j.bbamcr.2019.01.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 01/06/2019] [Accepted: 01/08/2019] [Indexed: 12/29/2022]
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27
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Chai GS, Feng Q, Ma RH, Qian XH, Luo DJ, Wang ZH, Hu Y, Sun DS, Zhang JF, Li X, Li XG, Ke D, Wang JZ, Yang XF, Liu GP. Inhibition of Histone Acetylation by ANP32A Induces Memory Deficits. J Alzheimers Dis 2018; 63:1537-1546. [DOI: 10.3233/jad-180090] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Gao-Shang Chai
- Department of Basic Medicine, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu, P. R. China
- Department of Pathophysiology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Key Laboratory of Ministry of Education of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
| | - Qiong Feng
- Department of Pathology, Wuhan Children’s Hospital, Wuhan, P. R. China
- Department of Pathophysiology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Key Laboratory of Ministry of Education of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
| | - Rong-Hong Ma
- Department of Laboratory Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
| | - Xiao-Hang Qian
- Department of Basic Medicine, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu, P. R. China
| | - Dan-Ju Luo
- Department of Pathology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
| | - Zhi-Hao Wang
- Department of Pathophysiology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Key Laboratory of Ministry of Education of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
| | - Yu Hu
- Department of Pathophysiology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Key Laboratory of Ministry of Education of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
| | - Dong-Sheng Sun
- Department of Pathophysiology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Key Laboratory of Ministry of Education of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
| | - Jun-Fei Zhang
- Department of Pathophysiology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Key Laboratory of Ministry of Education of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
| | - Xiao Li
- Department of Pathophysiology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Key Laboratory of Ministry of Education of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
| | - Xiao-Guang Li
- Department of Pathophysiology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Key Laboratory of Ministry of Education of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
| | - Dan Ke
- Department of Pathophysiology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Key Laboratory of Ministry of Education of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
| | - Jian-Zhi Wang
- Department of Pathophysiology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Key Laboratory of Ministry of Education of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
- Co-innovation Center of Neuroregeneration, Nantong University, Nantong, JS, China
| | - Xi-Fei Yang
- Key Laboratory of Modern Toxicology of Shenzhen, Shenzhen Center for Disease Control and Prevention, Longyuan Road, Nanshan District, Shenzhen, China
| | - Gong-Ping Liu
- Department of Pathophysiology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Key Laboratory of Ministry of Education of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P. R. China
- Co-innovation Center of Neuroregeneration, Nantong University, Nantong, JS, China
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28
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Coutinho LG, de Oliveira AHS, Witwer M, Leib SL, Agnez-Lima LF. DNA repair protein APE1 is involved in host response during pneumococcal meningitis and its expression can be modulated by vitamin B6. J Neuroinflammation 2017; 14:243. [PMID: 29233148 PMCID: PMC5727666 DOI: 10.1186/s12974-017-1020-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 12/04/2017] [Indexed: 01/01/2023] Open
Abstract
Background The production of reactive oxygen species (ROS) during pneumococcal meningitis (PM) leads to severe DNA damage in the neurons and is the major cause of cell death during infection. Hence, the use of antioxidants as adjuvant therapy has been investigated. Previous studies have demonstrated the possible participation of apurinic/apyrimidinic endonuclease (APE1) during PM. The aims of this study were to investigate the APE1 expression in the cortical and hippocampal tissues of infant Wistar rats infected with Streptococcus pneumoniae and its association with cell death and understand the role of vitamin B6 (vitB6) as a protective factor against cell death. Methods APE1 expression and oxidative stress markers were analyzed at two-time points, 20 and 24 h post infection (p.i.), in the cortex (CX) and hippocampus (HC) of rats supplemented with vitB6. Statistical analyses were performed by the nonparametric Kruskal–Wallis test using Dunn’s post test. Results Our results showed high protein levels of APE1 in CX and HC of infected rats. In the CX, at 20 h p.i., vitB6 supplementation led to the reduction of expression of APE1 and apoptosis-inducing factor, while no significant changes in the transcript levels of caspase-3 were observed. Furthermore, levels of carbonyl content and glutamate in the CX were reduced by vitB6 supplementation at the same time point of 20 h p.i.. Since our data showed a significant effect of vitB6 on the CX at 20 h p.i. rather than that at 24 h p.i., we evaluated the effect of administering a second dose of vitB6 at 18 h p.i. and sacrifice at 24 h p.i.. Reduction in the oxidative stress and APE1 levels were observed, although the latter was not significant. Although the levels of APE1 was not significantly changed in the HC with vitB6 adjuvant therapy, vitB6 supplementation prevented the formation of the truncated form of APE1 (34 kDa) that is associated with apoptosis. Conclusions Our data suggest that PM affects APE1 expression, which can be modulated by vitB6. Additionally, vitB6 contributes to the reduction of glutamate and ROS levels. Besides the potential to reduce cell death and oxidative stress during neuroinflammation, vitB6 showed enhanced effect on the CX than on the HC during PM.
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Affiliation(s)
- Leonam G Coutinho
- Departamento de Biologia Celular e Genética, Centro de Biociências, Universidade Federal do Rio Grande do Norte, UFRN, Campus Universitário, Lagoa Nova, Natal, RN, 59078-900, Brazil.,Instituto Federal de Educação Tecnológica do Rio Grande do Norte, IFRN, Natal, Brazil
| | | | - Matthias Witwer
- Institute for Infectious Diseases, University of Bern, Friedbuehlstrasse 51, CH-3010, Bern, Switzerland
| | - Stephen L Leib
- Institute for Infectious Diseases, University of Bern, Friedbuehlstrasse 51, CH-3010, Bern, Switzerland
| | - Lucymara F Agnez-Lima
- Departamento de Biologia Celular e Genética, Centro de Biociências, Universidade Federal do Rio Grande do Norte, UFRN, Campus Universitário, Lagoa Nova, Natal, RN, 59078-900, Brazil.
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29
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Regulation of limited N-terminal proteolysis of APE1 in tumor via acetylation and its role in cell proliferation. Oncotarget 2017; 7:22590-604. [PMID: 26981776 PMCID: PMC5008384 DOI: 10.18632/oncotarget.8026] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 02/25/2016] [Indexed: 11/25/2022] Open
Abstract
Mammalian apurinic/apyrimidinic (AP) endonuclease 1 (APE1), a ubiquitous and multifunctional protein, plays an essential role in the repair of both endogenous and drug-induced DNA damages in the genome. Unlike its E.coli counterpart Xth, mammalian APE1 has a unique N-terminal domain and possesses both DNA damage repair and transcriptional regulatory functions. Although the overexpression of APE1 in diverse cancer types and the association of APE1 expression with chemotherapy resistance and poor prognosis are well documented, the cellular and molecular mechanisms that alter APE1 functions during tumorigenesis are largely unknown. Here, we show the presence of full-length APE1 and N-terminal truncated isoforms of APE1 in tumor tissue samples of various cancer types. However, primary tumor tissue has higher levels of acetylated APE1 (AcAPE1) as well as full-length APE1 compared to adjacent non-tumor tissue. We found that APE1 is proteolytically cleaved by an unknown serine protease at its N-terminus following residue lysine (Lys) Lys6 and/or Lys7 and after Lys27 and Lys31 or Lys32. Acetylation of these Lys residues in APE1 prevents this proteolysis. The N-terminal domain of APE1 and its acetylation are required for modulation of the expression of hundreds of genes. Importantly, we found that AcAPE1 is essential for sustained cell proliferation. Together, our study demonstrates that increased acetylation levels of APE1 in tumor cells inhibit the limited N-terminal proteolysis of APE1 and thereby maintain the functions of APE1 to promote tumor cells' sustained proliferation and survival.
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30
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Shah F, Goossens E, Atallah NM, Grimard M, Kelley MR, Fishel ML. APE1/Ref-1 knockdown in pancreatic ductal adenocarcinoma - characterizing gene expression changes and identifying novel pathways using single-cell RNA sequencing. Mol Oncol 2017; 11:1711-1732. [PMID: 28922540 PMCID: PMC5709621 DOI: 10.1002/1878-0261.12138] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 08/24/2017] [Accepted: 09/02/2017] [Indexed: 12/18/2022] Open
Abstract
Apurinic/apyrimidinic endonuclease 1/redox factor-1 (APE1/Ref-1 or APE1) is a multifunctional protein that regulates numerous transcription factors associated with cancer-related pathways. Because APE1 is essential for cell viability, generation of APE1-knockout cell lines and determining a comprehensive list of genes regulated by APE1 has not been possible. To circumvent this challenge, we utilized single-cell RNA sequencing to identify differentially expressed genes (DEGs) in relation to APE1 protein levels within the cell. Using a straightforward yet novel statistical design, we identified 2837 genes whose expression is significantly changed following APE1 knockdown. Using this gene expression profile, we identified multiple new pathways not previously linked to APE1, including the EIF2 signaling and mechanistic target of Rapamycin pathways and a number of mitochondrial-related pathways. We demonstrate that APE1 has an effect on modifying gene expression up to a threshold of APE1 expression, demonstrating that it is not necessary to completely knockout APE1 in cells to accurately study APE1 function. We validated the findings using a selection of the DEGs along with siRNA knockdown and qRT-PCR. Testing additional patient-derived pancreatic cancer cells reveals particular genes (ITGA1, TNFAIP2, COMMD7, RAB3D) that respond to APE1 knockdown similarly across all the cell lines. Furthermore, we verified that the redox function of APE1 was responsible for driving gene expression of mitochondrial genes such as PRDX5 and genes that are important for proliferation such as SIPA1 and RAB3D by treating with APE1 redox-specific inhibitor, APX3330. Our study identifies several novel genes and pathways affected by APE1, as well as tumor subtype specificity. These findings will allow for hypothesis-driven approaches to generate combination therapies using, for example, APE1 inhibitor APX3330 with other approved FDA drugs in an innovative manner for pancreatic and other cancer treatments.
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Affiliation(s)
- Fenil Shah
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Emery Goossens
- Department of Statistics, Purdue University, West Lafayette, IN, USA
| | - Nadia M Atallah
- Purdue University Center for Cancer Research, Purdue University, West Lafayette, IN, USA
| | - Michelle Grimard
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Mark R Kelley
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA.,Department of Pharmacology & Toxicology, Indiana University School of Medicine, Indianapolis, IN, USA.,Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Melissa L Fishel
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA.,Department of Pharmacology & Toxicology, Indiana University School of Medicine, Indianapolis, IN, USA
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31
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DNA repair enzyme APE1 from evolutionarily ancient Hydra reveals redox activity exclusively found in mammalian APE1. DNA Repair (Amst) 2017; 59:44-56. [PMID: 28946035 DOI: 10.1016/j.dnarep.2017.09.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 09/10/2017] [Accepted: 09/15/2017] [Indexed: 01/12/2023]
Abstract
Only mammalian apurinic/apyrimidinic endonuclease1 (APE1) has been reported to possess both DNA repair and redox activities. C terminal of the protein is required for base excision repair, while the redox activity resides in the N terminal due to cysteine residues at specific positions. APE1s from other organisms studied so far lack the redox activity in spite of having the N terminal domain. We find that APE1 from the Cnidarian Hydra exhibits both endonuclease and redox activities similar to mammalian APE1. We further show the presence of the three indispensable cysteines in Hydra APE1 for redox activity by site directed mutagenesis. Importance of redox domain but not the repair domain of APE1 in regeneration has been demonstrated by using domain-specific inhibitors. Our findings clearly demonstrate that the redox function of APE1 evolved very early in metazoan evolution and is not a recent acquisition in mammalian APE1 as believed so far.
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The extracellular role of DNA damage repair protein APE1 in regulation of IL-6 expression. Cell Signal 2017; 39:18-31. [PMID: 28751279 DOI: 10.1016/j.cellsig.2017.07.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 07/21/2017] [Accepted: 07/23/2017] [Indexed: 11/20/2022]
Abstract
The human apurinic/apyrimidinic endonuclease 1 (APE1) is a pleiotropic nuclear protein with roles in DNA base excision repair pathway as well as in regulation of transcription. Recently, the presence of extracellular plasma APE1 was reported in endotoxemic rats. However, the biological significance and the extracellular function of APE1 remain unclear. In this study, we found that monocytes secrete APE1 upon inflammatory challenges. Challenging the monocytic cells with extracellular APE1 resulted in the increased expression and secretion of the pro-inflammatory cytokine IL-6. Additionally, the extracellular APE1 treatment activated the transcription factor NF-κB, followed by its increased occupancy at the IL-6 promoter, resulting in the induction of IL-6 expression. APE1-induced IL-6 further served to elicit autocrine and paracrine cellular responses. Moreover, the extracellular IL-6 promoted the secretion of APE1, thus indicating a functional feedforward loop in this pathway. Furthermore, we show that APE1 is secreted through extracellular vesicles formation via endosomal sorting complex required for transport (ESCRT)-dependent pathway. Together, our study demonstrates a novel role of extracellular APE1 in IL-6-dependent cellular responses.
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Lee PY, Park BC, Chi SW, Bae KH, Kim S, Cho S, Kang S, Kim JH, Park SG. Histone H4 is cleaved by granzyme A during staurosporine-induced cell death in B-lymphoid Raji cells. BMB Rep 2017; 49:560-565. [PMID: 27439606 PMCID: PMC5227298 DOI: 10.5483/bmbrep.2016.49.10.105] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Indexed: 01/06/2023] Open
Abstract
Granzyme A (GzmA) was first identified as a cytotoxic T lymphocyte protease protein with limited tissue expression. A number of cellular proteins are known to be cleaved by GzmA, and its function is to induce apoptosis. Histones H1, H2B, and H3 were identified as GzmA substrates during apoptotic cell death. Here, we demonstrated that histone H4 was cleaved by GzmA during staurosporine-induced cell death; however, in the presence of caspase inhibitors, staurosporine-treated Raji cells underwent necroptosis instead of apoptosis. Furthermore, histone H4 cleavage was blocked by the GzmA inhibitor nafamostat mesylate and by GzmA knockdown using siRNA. These results suggest that histone H4 is a novel substrate for GzmA in staurosporine-induced cells. [BMB Reports 2016; 49(10): 560-565]
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Affiliation(s)
- Phil Young Lee
- Disease Target Structure Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon 34141; Division of Life Sciences, Korea University, Seoul 02841, Korea
| | - Byoung Chul Park
- Disease Target Structure Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon 34141, Korea
| | - Seung Wook Chi
- Disease Target Structure Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon 34141, Korea
| | - Kwang-Hee Bae
- Metabolic Regulation Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon 34141, Korea
| | - Sunhong Kim
- Disease Target Structure Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon 34141, Korea
| | - Sayeon Cho
- College of Pharmacy, Chung-Ang University, Seoul 06974, Korea University, Seoul 02841, Korea
| | - Seongman Kang
- Division of Life Sciences, Korea University, Seoul 02841, Korea
| | - Jeong-Hoon Kim
- Personalized Genomic Medicine Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon 34141, Korea
| | - Sung Goo Park
- Disease Target Structure Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon 34141, Korea
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Kumar M, Kaur V, Kumar S, Kaur S. Phytoconstituents as apoptosis inducing agents: strategy to combat cancer. Cytotechnology 2016; 68:531-63. [PMID: 26239338 PMCID: PMC4960184 DOI: 10.1007/s10616-015-9897-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 06/15/2015] [Indexed: 12/20/2022] Open
Abstract
Advancement in the field of cancer molecular biology has aided researchers to develop various new chemopreventive agents which can target cancer cells exclusively. Cancer chemopreventive agents have proficiency to inhibit, reverse and delay process of carcinogenesis during its early and later course. Chemopreventive agents can act as antioxidative, antimutagenic/antigenotoxic, anti-inflammatory agents or via aiming various molecular targets in a cell to induce cell death. Apoptosis is a kind of cell death which shows various cellular morphological alterations such as cell shrinkage, blebbing of membrane, chromatin condensation, DNA fragmentation, formation of apoptotic bodies etc. Nowadays, apoptosis is being one of the new approaches for the identification and development of novel anticancer therapies. For centuries, plants are known to play part in daily routine from providing food to management of human health. In the last two decades, diverse phytochemicals and various botanical formulations have been characterized as agents that possess potential to execute cancer cells via inducing apoptosis. Data obtained from the research carried out globally pointed out that natural products are the potential candidates which have capability to combat cancer. In the present review, we surveyed literature on natural products which throws light on the mechanism through which these phytochemicals induce apoptosis in cancer cells.
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Affiliation(s)
- Manish Kumar
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, 143005, Punjab, India
| | - Varinder Kaur
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, 143005, Punjab, India
| | - Subodh Kumar
- Department of Chemistry, UGC Centre for Advanced Studies, Guru Nanak Dev University, Amritsar, 143005, Punjab, India
| | - Satwinderjeet Kaur
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, 143005, Punjab, India.
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Peroxiredoxin 1 interacts with and blocks the redox factor APE1 from activating interleukin-8 expression. Sci Rep 2016; 6:29389. [PMID: 27388124 PMCID: PMC4937415 DOI: 10.1038/srep29389] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 06/20/2016] [Indexed: 01/18/2023] Open
Abstract
APE1 is an essential DNA repair protein that also possesses the ability to regulate transcription. It has a unique cysteine residue C65, which maintains the reduce state of several transcriptional activators such as NF-κB. How APE1 is being recruited to execute the various biological functions remains unknown. Herein, we show that APE1 interacts with a novel partner PRDX1, a peroxidase that can also prevent oxidative damage to proteins by serving as a chaperone. PRDX1 knockdown did not interfere with APE1 expression level or its DNA repair activities. However, PRDX1 knockdown greatly facilitates APE1 detection within the nucleus by indirect immunofluorescence analysis, even though APE1 level was unchanged. The loss of APE1 interaction with PRDX1 promotes APE1 redox function to activate binding of the transcription factor NF-κB onto the promoter of a target gene, the proinflammatory chemokine IL-8 involved in cancer invasion and metastasis, resulting in its upregulation. Depletion of APE1 blocked the upregulation of IL-8 in the PRDX1 knockdown cells. Our findings suggest that the interaction of PRDX1 with APE1 represents a novel anti-inflammatory function of PRDX1, whereby the association safeguards APE1 from reducing transcription factors and activating superfluous gene expression, which otherwise could trigger cancer invasion and metastasis.
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Abstract
SET is elevated and mislocalized in the neuronal cytoplasm in brains of Alzheimer's disease (AD) and Down syndrome (DS) patients. Cytoplasm SET leads to inhibition of protein phosphatase 2A and is involved in the tau pathology. However, the regulation of SET gene expression remains elusive. In the present study, we cloned a 1399-bp segment of the 5' flanking region of the human SET gene and identified that the transcription start site (TSS) of SET transcript 1 is located at 123 bp upstream of the translation start site ATG in exon 1. Sequence analysis reveals several putative regulatory elements including NFkB, Sp1, and HSE. Luciferase assay and electrophoretic mobility shift assay (EMSA) identified a functional cis-acting NFkB-responsive element in the SET gene promoter. Overexpression and activation of NFkB upregulate transcription of SET isoform 1 but not isoform 2, indicating that the expression of these two isoforms is differentially regulated. The results demonstrate that NFkB plays an important role in regulation of the human SET gene expression. Our findings suggest that oxidative stress and inflammatory responses could result in abnormal SET gene expression, contributing to the tauopathy in AD pathogenesis.
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Balasubramanian PK, Balupuri A, Cho SJ. Structural insights into the ligand-binding hot spots of APEX1: an in silico analysis. Med Chem Res 2015. [DOI: 10.1007/s00044-015-1379-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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38
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Thakur S, Dhiman M, Tell G, Mantha AK. A review on protein-protein interaction network of APE1/Ref-1 and its associated biological functions. Cell Biochem Funct 2015; 33:101-12. [DOI: 10.1002/cbf.3100] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Revised: 02/10/2015] [Accepted: 02/24/2015] [Indexed: 12/17/2022]
Affiliation(s)
- S. Thakur
- Center for Biosciences, School of Basic and Applied Sciences; Central University of Punjab; Bathinda Punjab India
| | - M. Dhiman
- Center for Genetic Diseases and Molecular Medicine, School of Emerging Life Science Technologies; Central University of Punjab; Bathinda Punjab India
| | - G. Tell
- Department of Medical and Biological Sciences; University of Udine; Udine Italy
| | - A. K. Mantha
- Center for Biosciences, School of Basic and Applied Sciences; Central University of Punjab; Bathinda Punjab India
- Department of Biochemistry and Molecular Biology; University of Texas Medical Branch; Galveston TX USA
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Azad GK, Tomar RS. Proteolytic clipping of histone tails: the emerging role of histone proteases in regulation of various biological processes. Mol Biol Rep 2015; 41:2717-30. [PMID: 24469733 DOI: 10.1007/s11033-014-3181-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Chromatin is a dynamic DNA scaffold structure that responds to a variety of external and internal stimuli to regulate the fundamental biological processes. Majority of the cases chromatin dynamicity is exhibited through chemical modifications and physical changes between DNA and histones. These modifications are reversible and complex signaling pathways involving chromatin-modifying enzymes regulate the fluidity of chromatin. Fluidity of chromatin can also be impacted through irreversible change, proteolytic processing of histones which is a poorly understood phenomenon. In recent studies, histone proteolysis has been implicated as a regulatory process involved in the permanent removal of epigenetic marks from histones. Activities responsible for clipping of histone tails and their significance in various biological processes have been observed in several organisms. Here, we have reviewed the properties of some of the known histone proteases, analyzed their significance in biological processes and have provided future directions.
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Affiliation(s)
- Gajendra Kumar Azad
- Laboratory of Chromatin Biology, Department of Biological Sciences, Indian Institute of Science Education and Research, Bhopal, 462023, India
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40
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Andres SN, Schellenberg MJ, Wallace BD, Tumbale P, Williams RS. Recognition and repair of chemically heterogeneous structures at DNA ends. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2015; 56:1-21. [PMID: 25111769 PMCID: PMC4303525 DOI: 10.1002/em.21892] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2014] [Accepted: 07/28/2014] [Indexed: 05/13/2023]
Abstract
Exposure to environmental toxicants and stressors, radiation, pharmaceutical drugs, inflammation, cellular respiration, and routine DNA metabolism all lead to the production of cytotoxic DNA strand breaks. Akin to splintered wood, DNA breaks are not "clean." Rather, DNA breaks typically lack DNA 5'-phosphate and 3'-hydroxyl moieties required for DNA synthesis and DNA ligation. Failure to resolve damage at DNA ends can lead to abnormal DNA replication and repair, and is associated with genomic instability, mutagenesis, neurological disease, ageing and carcinogenesis. An array of chemically heterogeneous DNA termini arises from spontaneously generated DNA single-strand and double-strand breaks (SSBs and DSBs), and also from normal and/or inappropriate DNA metabolism by DNA polymerases, DNA ligases and topoisomerases. As a front line of defense to these genotoxic insults, eukaryotic cells have accrued an arsenal of enzymatic first responders that bind and protect damaged DNA termini, and enzymatically tailor DNA ends for DNA repair synthesis and ligation. These nucleic acid transactions employ direct damage reversal enzymes including Aprataxin (APTX), Polynucleotide kinase phosphatase (PNK), the tyrosyl DNA phosphodiesterases (TDP1 and TDP2), the Ku70/80 complex and DNA polymerase β (POLβ). Nucleolytic processing enzymes such as the MRE11/RAD50/NBS1/CtIP complex, Flap endonuclease (FEN1) and the apurinic endonucleases (APE1 and APE2) also act in the chemical "cleansing" of DNA breaks to prevent genomic instability and disease, and promote progression of DNA- and RNA-DNA damage response (DDR and RDDR) pathways. Here, we provide an overview of cellular first responders dedicated to the detection and repair of abnormal DNA termini.
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Affiliation(s)
- Sara N Andres
- Laboratory of Structural Biology, National Institute of Environmental Health Sciences, NIH, DHHS, North Carolina
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41
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Fishel ML, Wu X, Devlin CM, Logsdon DP, Jiang Y, Luo M, He Y, Yu Z, Tong Y, Lipking KP, Maitra A, Rajeshkumar NV, Scandura G, Kelley MR, Ivan M. Apurinic/apyrimidinic endonuclease/redox factor-1 (APE1/Ref-1) redox function negatively regulates NRF2. J Biol Chem 2014; 290:3057-68. [PMID: 25492865 DOI: 10.1074/jbc.m114.621995] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Apurinic/apyrimidinic endonuclease/redox factor-1 (APE1/Ref-1) (henceforth referred to as Ref-1) is a multifunctional protein that in addition to its base excision DNA repair activity exerts redox control of multiple transcription factors, including nuclear factor κ-light chain enhancer of activated B cells (NF-κB), STAT3, activator protein-1 (AP-1), hypoxia-inducible factor-1 (HIF-1), and tumor protein 53 (p53). In recent years, Ref-1 has emerged as a promising therapeutic target in cancer, particularly in pancreatic ductal carcinoma. Although a significant amount of research has centered on Ref-1, no wide-ranging approach had been performed on the effects of Ref-1 inhibition and transcription factor activity perturbation. Starting with a broader approach, we identified a previously unsuspected effect on the nuclear factor erythroid-related factor 2 (NRF2), a critical regulator of cellular defenses against oxidative stress. Based on genetic and small molecule inhibitor-based methodologies, we demonstrated that repression of Ref-1 potently activates NRF2 and its downstream targets in a dose-dependent fashion, and that the redox, rather than the DNA repair function of Ref-1 is critical for this effect. Intriguingly, our results also indicate that this pathway does not involve reactive oxygen species. The link between Ref-1 and NRF2 appears to be present in all cells tested in vitro, noncancerous and cancerous, including patient-derived tumor samples. In particular, we focused on understanding the implications of the novel interaction between these two pathways in primary pancreatic ductal adenocarcinoma tumor cells and provide the first evidence that this mechanism has implications for overcoming the resistance against experimental drugs targeting Ref-1 activity, with clear translational implications.
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Affiliation(s)
- Melissa L Fishel
- From the Departments of Pediatrics, Wells Center for Pediatric Research, Pharmacology and Toxicology,
| | - Xue Wu
- Microbiology and Immunology
| | | | | | - Yanlin Jiang
- From the Departments of Pediatrics, Wells Center for Pediatric Research
| | - Meihua Luo
- From the Departments of Pediatrics, Wells Center for Pediatric Research, Pharmacology and Toxicology
| | - Ying He
- From the Departments of Pediatrics, Wells Center for Pediatric Research
| | | | | | - Kelsey P Lipking
- Pathology, Indiana University School of Medicine, Indianapolis, Indiana 46202 and
| | - Anirban Maitra
- the Departments of Oncology and Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | - N V Rajeshkumar
- the Departments of Oncology and Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | | | - Mark R Kelley
- From the Departments of Pediatrics, Wells Center for Pediatric Research, Pharmacology and Toxicology
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42
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Jobert L, Nilsen H. Regulatory mechanisms of RNA function: emerging roles of DNA repair enzymes. Cell Mol Life Sci 2014; 71:2451-65. [PMID: 24496644 PMCID: PMC4055861 DOI: 10.1007/s00018-014-1562-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 01/05/2014] [Accepted: 01/10/2014] [Indexed: 12/13/2022]
Abstract
The acquisition of an appropriate set of chemical modifications is required in order to establish correct structure of RNA molecules, and essential for their function. Modification of RNA bases affects RNA maturation, RNA processing, RNA quality control, and protein translation. Some RNA modifications are directly involved in the regulation of these processes. RNA epigenetics is emerging as a mechanism to achieve dynamic regulation of RNA function. Other modifications may prevent or be a signal for degradation. All types of RNA species are subject to processing or degradation, and numerous cellular mechanisms are involved. Unexpectedly, several studies during the last decade have established a connection between DNA and RNA surveillance mechanisms in eukaryotes. Several proteins that respond to DNA damage, either to process or to signal the presence of damaged DNA, have been shown to participate in RNA quality control, turnover or processing. Some enzymes that repair DNA damage may also process modified RNA substrates. In this review, we give an overview of the DNA repair proteins that function in RNA metabolism. We also discuss the roles of two base excision repair enzymes, SMUG1 and APE1, in RNA quality control.
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Affiliation(s)
- Laure Jobert
- Division of Medicine, Department of Clinical Molecular Biology, Akershus University Hospital, Nordbyhagen, 1478 Lørenskog, Norway
| | - Hilde Nilsen
- Division of Medicine, Department of Clinical Molecular Biology, Akershus University Hospital, Nordbyhagen, 1478 Lørenskog, Norway
- Department of Clinical Molecular Biology, Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Blindern, P.O.Box 1171, 0318 Oslo, Norway
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43
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Abstract
SIGNIFICANCE Human apurinic/apyrimidinic endonuclease 1 (APE1, also known as REF-1) was isolated based on its ability to cleave at AP sites in DNA or activate the DNA binding activity of certain transcription factors. We review herein topics related to this multi-functional DNA repair and stress-response protein. RECENT ADVANCES APE1 displays homology to Escherichia coli exonuclease III and is a member of the divalent metal-dependent α/β fold-containing phosphoesterase superfamily of enzymes. APE1 has acquired distinct active site and loop elements that dictate substrate selectivity, and a unique N-terminus which at minimum imparts nuclear targeting and interaction specificity. Additional activities ascribed to APE1 include 3'-5' exonuclease, 3'-repair diesterase, nucleotide incision repair, damaged or site-specific RNA cleavage, and multiple transcription regulatory roles. CRITICAL ISSUES APE1 is essential for mouse embryogenesis and contributes to cell viability in a genetic background-dependent manner. Haploinsufficient APE1(+/-) mice exhibit reduced survival, increased cancer formation, and cellular/tissue hyper-sensitivity to oxidative stress, supporting the notion that impaired APE1 function associates with disease susceptibility. Although abnormal APE1 expression/localization has been seen in cancer and neuropathologies, and impaired-function variants have been described, a causal link between an APE1 defect and human disease remains elusive. FUTURE DIRECTIONS Ongoing efforts aim at delineating the biological role(s) of the different APE1 activities, as well as the regulatory mechanisms for its intra-cellular distribution and participation in diverse molecular pathways. The determination of whether APE1 defects contribute to human disease, particularly pathologies that involve oxidative stress, and whether APE1 small-molecule regulators have clinical utility, is central to future investigations.
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Affiliation(s)
- Mengxia Li
- Intramural Research Program, Laboratory of Molecular Gerontology, National Institute on Aging, National Institutes of Health , Baltimore, Maryland
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44
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Joeckel LT, Bird PI. Are all granzymes cytotoxic in vivo? Biol Chem 2014; 395:181-202. [DOI: 10.1515/hsz-2013-0238] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2013] [Accepted: 08/30/2013] [Indexed: 01/01/2023]
Abstract
Abstract
Granzymes are serine proteases mainly found in cytotoxic lymphocytes. The most-studied member of this group is granzyme B, which is a potent cytotoxin that has set the paradigm that all granzymes are cyototoxic. In the last 5 years, this paradigm has become controversial. On one hand, there is a plethora of sometimes contradictory publications showing mainly caspase-independent cytotoxic effects of granzyme A and the so-called orphan granzymes in vitro. On the other hand, there are increasing numbers of reports of granzymes failing to induce cell death in vitro unless very high (potentially supra-physiological) concentrations are used. Furthermore, experiments with granzyme A or granzyme M knock-out mice reveal little or no deficit in their cytotoxic lymphocytes’ killing ability ex vivo, but indicate impairment in the inflammatory response. These findings of non-cytotoxic effects of granzymes challenge dogma, and thus require alternative or additional explanations to be developed of the role of granzymes in defeating pathogens. Here we review evidence for granzyme cytotoxicity, give an overview of their non-cytotoxic functions, and suggest technical improvements for future investigations.
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45
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Scott TL, Rangaswamy S, Wicker CA, Izumi T. Repair of oxidative DNA damage and cancer: recent progress in DNA base excision repair. Antioxid Redox Signal 2014; 20:708-26. [PMID: 23901781 PMCID: PMC3960848 DOI: 10.1089/ars.2013.5529] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
SIGNIFICANCE Reactive oxygen species (ROS) are generated by exogenous and environmental genotoxins, but also arise from mitochondria as byproducts of respiration in the body. ROS generate DNA damage of which pathological consequence, including cancer is well established. Research efforts are intense to understand the mechanism of DNA base excision repair, the primary mechanism to protect cells from genotoxicity caused by ROS. RECENT ADVANCES In addition to the notion that oxidative DNA damage causes transformation of cells, recent studies have revealed how the mitochondrial deficiencies and ROS generation alter cell growth during the cancer transformation. CRITICAL ISSUES The emphasis of this review is to highlight the importance of the cellular response to oxidative DNA damage during carcinogenesis. Oxidative DNA damage, including 7,8-dihydro-8-oxoguanine, play an important role during the cellular transformation. It is also becoming apparent that the unusual activity and subcellular distribution of apurinic/apyrimidinic endonuclease 1, an essential DNA repair factor/redox sensor, affect cancer malignancy by increasing cellular resistance to oxidative stress and by positively influencing cell proliferation. FUTURE DIRECTIONS Technological advancement in cancer cell biology and genetics has enabled us to monitor the detailed DNA repair activities in the microenvironment. Precise understanding of the intracellular activities of DNA repair proteins for oxidative DNA damage should provide help in understanding how mitochondria, ROS, DNA damage, and repair influence cancer transformation.
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Affiliation(s)
- Timothy L Scott
- Graduate Center for Toxicology, University of Kentucky , Lexington, Kentucky
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46
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van Domselaar R, de Poot SAH, Bovenschen N. Proteomic profiling of proteases: tools for granzyme degradomics. Expert Rev Proteomics 2014; 7:347-59. [DOI: 10.1586/epr.10.24] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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47
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Thomas MP, Lieberman J. Live or let die: posttranscriptional gene regulation in cell stress and cell death. Immunol Rev 2013; 253:237-52. [PMID: 23550650 DOI: 10.1111/imr.12052] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Studies of the regulation of gene expression historically focused on transcription. However, during stress and apoptosis, profound gene expression changes occur more rapidly and globally than is possible by regulating transcription. Posttranscriptional changes in mRNA processing and translation in response to diverse stresses shut down most protein translation to conserve energy and lead to rapid remodeling of the proteome to promote repair. Pre-mRNA splicing and mRNA stability are fundamentally altered under some stress conditions. Stress pathways coordinate a cytoprotective repair response, while simultaneously initiating signaling that can ultimately trigger cell death. How the cell mediates the decision between repair and apoptosis is largely not understood. In some stresses, microRNAs may tip the balance. Here, we review what is known about posttranscriptional gene regulation during stress, focusing on what is still unknown and how new technologies might be used to understand what changes are most physiologically important in different forms of stress and death.
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Affiliation(s)
- Marshall P Thomas
- Program in Cellular and Molecular Medicine, Boston Children's Hospital and Department of Pediatrics, Harvard Medical School, Boston, MA, USA
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48
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Role of the unstructured N-terminal domain of the hAPE1 (human apurinic/apyrimidinic endonuclease 1) in the modulation of its interaction with nucleic acids and NPM1 (nucleophosmin). Biochem J 2013; 452:545-57. [PMID: 23544830 DOI: 10.1042/bj20121277] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The hAPE1 (human apurinic/apyrimidinic endonuclease 1) is an essential enzyme, being the main abasic endonuclease in higher eukaryotes. However, there is strong evidence to show that hAPE1 can directly bind specific gene promoters, thus modulating their transcriptional activity, even in the absence of specific DNA damage. Recent findings, moreover, suggest a role for hAPE1 in RNA processing, which is modulated by the interaction with NPM1 (nucleophosmin). Independent domains account for many activities of hAPE1; however, whereas the endonuclease and the redox-active portions of the protein are well characterized, a better understanding of the role of the unstructured N-terminal region is needed. In the present study, we characterized the requirements for the interaction of hAPE1 with NPM1 and undamaged nucleic acids. We show that DNA/RNA secondary structure has an impact on hAPE1 binding in the absence of damage. Biochemical studies, using the isolated N-terminal region of the protein, reveal that the hAPE1 N-terminal domain represents an evolutionary gain of function, since its composition affects the protein's stability and ability to interact with both nucleic acids and NPM1. Although required, however, this region is not sufficient itself to stably interact with DNA or NPM1.
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49
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Vascotto C, Lirussi L, Poletto M, Tiribelli M, Damiani D, Fabbro D, Damante G, Demple B, Colombo E, Tell G. Functional regulation of the apurinic/apyrimidinic endonuclease 1 by nucleophosmin: impact on tumor biology. Oncogene 2013; 33:2876-87. [PMID: 23831574 DOI: 10.1038/onc.2013.251] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Revised: 04/24/2013] [Accepted: 05/19/2013] [Indexed: 12/17/2022]
Abstract
Nucleophosmin 1 (NPM1) is a nucleolar protein involved in ribosome biogenesis, stress responses and maintaining genome stability. One-third of acute myeloid leukemias (AMLs) are associated with aberrant localization of NPM1 to the cytoplasm (NPM1c+). This mutation is critical during leukemogenesis and constitutes a good prognostic factor for chemotherapy. At present, there is no clear molecular basis for the role of NPM1 in DNA repair and the tumorigenic process. We found that the nuclear apurinic/apyrimidinic endonuclease 1 (APE1), a core enzyme in base excision DNA repair (BER) of DNA lesions, specifically interacts with NPM1 within nucleoli and the nucleoplasm. Cytoplasmic accumulation of APE1 is associated with cancers including, as we show, NPM1c+ AML. Here we show that NPM1 stimulates APE1 BER activity in cells. We provide evidence that expression of the NPM1c+ variant causes cytoplasmic accumulation of APE1 in: (i) a heterologous cell system (HeLa cells); (ii) the myeloid cell line OCI/AML3 stably expressing NPM1c+; and (iii) primary lymphoblasts of NPM1c+ AML patients. Consistent with impaired APE1 localization, OCI/AML3 cells and blasts of AML patients have impaired BER activity. Cytoplasmic APE1 in NPM1c+ myeloid cells is truncated due to proteolysis. Thus, the good prognostic response of NPM1c+ AML to chemotherapy may result from the cytoplasmic relocalization of APE1 and the consequent BER deficiency. NPM1 thus has an indirect but significant role in BER in vivo that may also be important for NPM1c+ tumorigenesis.
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Affiliation(s)
- C Vascotto
- Department of Medical and Biological Sciences, University of Udine, Udine, Italy
| | - L Lirussi
- Department of Medical and Biological Sciences, University of Udine, Udine, Italy
| | - M Poletto
- Department of Medical and Biological Sciences, University of Udine, Udine, Italy
| | - M Tiribelli
- Department of Experimental and Clinical Medical Sciences, University of Udine, Udine, Italy
| | - D Damiani
- Department of Experimental and Clinical Medical Sciences, University of Udine, Udine, Italy
| | - D Fabbro
- Department of Medical and Biological Sciences, University of Udine, Udine, Italy
| | - G Damante
- Department of Medical and Biological Sciences, University of Udine, Udine, Italy
| | - B Demple
- Department of Pharmacological Sciences, Stony Brook University School of Medicine, Stony Brook, NY, USA
| | - E Colombo
- Department of Medicine, Surgery and Dentistry, University of Milan, Milan, Italy
| | - G Tell
- Department of Medical and Biological Sciences, University of Udine, Udine, Italy
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50
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Susanto O, Stewart SE, Voskoboinik I, Brasacchio D, Hagn M, Ellis S, Asquith S, Sedelies KA, Bird PI, Waterhouse NJ, Trapani JA. Mouse granzyme A induces a novel death with writhing morphology that is mechanistically distinct from granzyme B-induced apoptosis. Cell Death Differ 2013; 20:1183-93. [PMID: 23744295 DOI: 10.1038/cdd.2013.59] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Revised: 03/28/2013] [Accepted: 04/30/2013] [Indexed: 02/01/2023] Open
Abstract
Human and mouse granzyme (Gzm)B both induce target cell apoptosis in concert with pore-forming perforin (Pfp); however the mechanisms by which other Gzms induce non-apoptotic death remain controversial and poorly characterised. We used timelapse microscopy to document, quantitatively and in real time, the death of target cells exposed to primary natural killer (NK) cells from mice deficient in key Gzms. We found that in the vast majority of cases, NK cells from wild-type mice induced classic apoptosis. However, NK cells from syngeneic Gzm B-deficient mice induced a novel form of cell death characterised by slower kinetics and a pronounced, writhing, 'worm-like' morphology. Dying cells initially contracted but did not undergo membrane blebbing, and annexin-V staining was delayed until the onset of secondary necrosis. As it is different from any cell death process previously reported, we tentatively termed this cell death 'athetosis'. Two independent lines of evidence showed this alternate form of death was due to Gzm A: first, cell death was revealed in the absence of Gzm B, but was completely lost when the NK cells were deficient in both Gzm A and B; second, the athetotic morphology was precisely reproduced when recombinant mouse Gzm A was delivered by an otherwise innocuous dose of recombinant Pfp. Gzm A-mediated athetosis did not require caspase activation, early mitochondrial disruption or generation of reactive oxygen species, but did require an intact actin cytoskeleton and was abolished by latrunculin B and mycalolide B. This work defines an authentic role for mouse Gzm A in granule-induced cell death by cytotoxic lymphocytes.
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Affiliation(s)
- O Susanto
- Cancer Cell Death Laboratory, Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia
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