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Kalamuddin M, Shakri AR, Wang C, Min H, Li X, Cui L, Miao J. MYST regulates DNA repair and forms a NuA4-like complex in the malaria parasite Plasmodium falciparum. mSphere 2024; 9:e0014024. [PMID: 38564734 PMCID: PMC11036802 DOI: 10.1128/msphere.00140-24] [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: 02/21/2024] [Accepted: 03/13/2024] [Indexed: 04/04/2024] Open
Abstract
Histone lysine acetyltransferase MYST-associated NuA4 complex is conserved from yeast to humans and plays key roles in cell cycle regulation, gene transcription, and DNA replication/repair. Here, we identified a Plasmodium falciparum MYST-associated complex, PfNuA4, which contains 11 of the 13 conserved NuA4 subunits. Reciprocal pulldowns using PfEAF2, a shared component between the NuA4 and SWR1 complexes, not only confirmed the PfNuA4 complex but also identified the PfSWR1 complex, a histone remodeling complex, although their identities are low compared to the homologs in yeast or humans. Notably, both H2A.Z/H2B.Z were associated with the PfSWR1 complex, indicating that this complex is involved in the deposition of H2A.Z/H2B.Z, the variant histone pair that is enriched in the activated promoters. Overexpression of PfMYST resulted in earlier expression of genes involved in cell cycle regulation, DNA replication, and merozoite invasion, and upregulation of the genes related to antigenic variation and DNA repair. Consistently, PfMYST overexpression led to high basal phosphorylated PfH2A (γ-PfH2A), the mark of DNA double-strand breaks, and conferred protection against genotoxic agent methyl methanesulfonate (MMS), X-rays, and artemisinin, the first-line antimalarial drug. In contrast, the knockdown of PfMYST caused a delayed parasite recovery upon MMS treatment. MMS induced the gradual disappearance of PfMYST in the cytoplasm and concomitant accumulation of PfMYST in the nucleus, suggesting cytoplasm-nucleus shuttling of PfMYST. Meanwhile, PfMYST colocalized with the γ-PfH2A, indicating PfMYST was recruited to the DNA damage sites. Collectively, PfMYST plays critical roles in cell cycle regulation, gene transcription, and DNA replication/DNA repair in this low-branching parasitic protist.IMPORTANCEUnderstanding gene regulation and DNA repair in malaria parasites is critical for identifying targets for antimalarials. This study found PfNuA4, a PfMYST-associated, histone modifier complex, and PfSWR1, a chromatin remodeling complex in malaria parasite Plasmodium falciparum. These complexes are divergent due to the low identities compared to their homologs from yeast and humans. Furthermore, overexpression of PfMYST resulted in substantial transcriptomic changes, indicating that PfMYST is involved in regulating the cell cycle, antigenic variation, and DNA replication/repair. Consistently, PfMYST was found to protect against DNA damage caused by the genotoxic agent methyl methanesulfonate, X-rays, and artemisinin, the first-line antimalarial drug. Additionally, DNA damage led to the relocation of cytoplasmic PfMYST to the nucleus and colocalization of PfMYST with γ-PfH2A, the mark of DNA damage. In summary, this study demonstrated that the PfMYST complex has critical functions in regulating cell cycle, antigenic variation, and DNA replication/DNA repair in P. falciparum.
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Affiliation(s)
- Mohammad Kalamuddin
- Department of Internal Medicine, University of South Florida, Morsani College of Medicine, Tampa, Florida, USA
| | - Ahmad Rushdi Shakri
- Department of Internal Medicine, University of South Florida, Morsani College of Medicine, Tampa, Florida, USA
| | - Chengqi Wang
- Center for Global Health and Infectious Diseases Research, College of Public Health, University of South Florida, Tampa, Florida, USA
| | - Hui Min
- Department of Internal Medicine, University of South Florida, Morsani College of Medicine, Tampa, Florida, USA
| | - Xiaolian Li
- Department of Internal Medicine, University of South Florida, Morsani College of Medicine, Tampa, Florida, USA
| | - Liwang Cui
- Department of Internal Medicine, University of South Florida, Morsani College of Medicine, Tampa, Florida, USA
- Center for Global Health and Infectious Diseases Research, College of Public Health, University of South Florida, Tampa, Florida, USA
| | - Jun Miao
- Department of Internal Medicine, University of South Florida, Morsani College of Medicine, Tampa, Florida, USA
- Center for Global Health and Infectious Diseases Research, College of Public Health, University of South Florida, Tampa, Florida, USA
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Yang B, Lin Y, Huang Y, Shen YQ, Chen Q. Thioredoxin (Trx): A redox target and modulator of cellular senescence and aging-related diseases. Redox Biol 2024; 70:103032. [PMID: 38232457 PMCID: PMC10827563 DOI: 10.1016/j.redox.2024.103032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 12/03/2023] [Accepted: 01/04/2024] [Indexed: 01/19/2024] Open
Abstract
Thioredoxin (Trx) is a compact redox-regulatory protein that modulates cellular redox state by reducing oxidized proteins. Trx exhibits dual functionality as an antioxidant and a cofactor for diverse enzymes and transcription factors, thereby exerting influence over their activity and function. Trx has emerged as a pivotal biomarker for various diseases, particularly those associated with oxidative stress, inflammation, and aging. Recent clinical investigations have underscored the significance of Trx in disease diagnosis, treatment, and mechanistic elucidation. Despite its paramount importance, the intricate interplay between Trx and cellular senescence-a condition characterized by irreversible growth arrest induced by multiple aging stimuli-remains inadequately understood. In this review, our objective is to present a comprehensive and up-to-date overview of the structure and function of Trx, its involvement in redox signaling pathways and cellular senescence, its association with aging and age-related diseases, as well as its potential as a therapeutic target. Our review aims to elucidate the novel and extensive role of Trx in senescence while highlighting its implications for aging and age-related diseases.
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Affiliation(s)
- Bowen Yang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Chinese Academy of Medical Sciences Research Unit of Oral Carcinogenesis and Management, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China.
| | - Yumeng Lin
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Chinese Academy of Medical Sciences Research Unit of Oral Carcinogenesis and Management, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China.
| | - Yibo Huang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Chinese Academy of Medical Sciences Research Unit of Oral Carcinogenesis and Management, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China.
| | - Ying-Qiang Shen
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Chinese Academy of Medical Sciences Research Unit of Oral Carcinogenesis and Management, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China.
| | - Qianming Chen
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Chinese Academy of Medical Sciences Research Unit of Oral Carcinogenesis and Management, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China
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3
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Mavroeidi D, Georganta A, Panagiotou E, Syrigos K, Souliotis VL. Targeting ATR Pathway in Solid Tumors: Evidence of Improving Therapeutic Outcomes. Int J Mol Sci 2024; 25:2767. [PMID: 38474014 DOI: 10.3390/ijms25052767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 02/23/2024] [Accepted: 02/26/2024] [Indexed: 03/14/2024] Open
Abstract
The DNA damage response (DDR) system is a complicated network of signaling pathways that detects and repairs DNA damage or induces apoptosis. Critical regulators of the DDR network include the DNA damage kinases ataxia telangiectasia mutated Rad3-related kinase (ATR) and ataxia-telangiectasia mutated (ATM). The ATR pathway coordinates processes such as replication stress response, stabilization of replication forks, cell cycle arrest, and DNA repair. ATR inhibition disrupts these functions, causing a reduction of DNA repair, accumulation of DNA damage, replication fork collapse, inappropriate mitotic entry, and mitotic catastrophe. Recent data have shown that the inhibition of ATR can lead to synthetic lethality in ATM-deficient malignancies. In addition, ATR inhibition plays a significant role in the activation of the immune system by increasing the tumor mutational burden and neoantigen load as well as by triggering the accumulation of cytosolic DNA and subsequently inducing the cGAS-STING pathway and the type I IFN response. Taken together, we review stimulating data showing that ATR kinase inhibition can alter the DDR network, the immune system, and their interplay and, therefore, potentially provide a novel strategy to improve the efficacy of antitumor therapy, using ATR inhibitors as monotherapy or in combination with genotoxic drugs and/or immunomodulators.
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Affiliation(s)
- Dimitra Mavroeidi
- Institute of Chemical Biology, National Hellenic Research Foundation, 116 35 Athens, Greece
- Third Department of Medicine, Sotiria General Hospital for Chest Diseases, National and Kapodistrian University of Athens, 115 27 Athens, Greece
| | - Anastasia Georganta
- Third Department of Medicine, Sotiria General Hospital for Chest Diseases, National and Kapodistrian University of Athens, 115 27 Athens, Greece
| | - Emmanouil Panagiotou
- Third Department of Medicine, Sotiria General Hospital for Chest Diseases, National and Kapodistrian University of Athens, 115 27 Athens, Greece
| | - Konstantinos Syrigos
- Third Department of Medicine, Sotiria General Hospital for Chest Diseases, National and Kapodistrian University of Athens, 115 27 Athens, Greece
| | - Vassilis L Souliotis
- Institute of Chemical Biology, National Hellenic Research Foundation, 116 35 Athens, Greece
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Yap TA, Fontana E, Lee EK, Spigel DR, Højgaard M, Lheureux S, Mettu NB, Carneiro BA, Carter L, Plummer R, Cote GM, Meric-Bernstam F, O'Connell J, Schonhoft JD, Wainszelbaum M, Fretland AJ, Manley P, Xu Y, Ulanet D, Rimkunas V, Zinda M, Koehler M, Silverman IM, Reis-Filho JS, Rosen E. Camonsertib in DNA damage response-deficient advanced solid tumors: phase 1 trial results. Nat Med 2023; 29:1400-1411. [PMID: 37277454 PMCID: PMC10287555 DOI: 10.1038/s41591-023-02399-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 05/12/2023] [Indexed: 06/07/2023]
Abstract
Predictive biomarkers of response are essential to effectively guide targeted cancer treatment. Ataxia telangiectasia and Rad3-related kinase inhibitors (ATRi) have been shown to be synthetic lethal with loss of function (LOF) of ataxia telangiectasia-mutated (ATM) kinase, and preclinical studies have identified ATRi-sensitizing alterations in other DNA damage response (DDR) genes. Here we report the results from module 1 of an ongoing phase 1 trial of the ATRi camonsertib (RP-3500) in 120 patients with advanced solid tumors harboring LOF alterations in DDR genes, predicted by chemogenomic CRISPR screens to sensitize tumors to ATRi. Primary objectives were to determine safety and propose a recommended phase 2 dose (RP2D). Secondary objectives were to assess preliminary anti-tumor activity, to characterize camonsertib pharmacokinetics and relationship with pharmacodynamic biomarkers and to evaluate methods for detecting ATRi-sensitizing biomarkers. Camonsertib was well tolerated; anemia was the most common drug-related toxicity (32% grade 3). Preliminary RP2D was 160 mg weekly on days 1-3. Overall clinical response, clinical benefit and molecular response rates across tumor and molecular subtypes in patients who received biologically effective doses of camonsertib (>100 mg d-1) were 13% (13/99), 43% (43/99) and 43% (27/63), respectively. Clinical benefit was highest in ovarian cancer, in tumors with biallelic LOF alterations and in patients with molecular responses. ClinicalTrials.gov registration: NCT04497116 .
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Affiliation(s)
- Timothy A Yap
- Department of Investigational Cancer Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
| | | | - Elizabeth K Lee
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - David R Spigel
- Sarah Cannon Research Institute/Tennessee Oncology, Nashville, TN, USA
| | | | | | - Niharika B Mettu
- Department of Medical Oncology, Duke University, Durham, NC, USA
| | - Benedito A Carneiro
- Legorreta Cancer Center at Brown University and Lifespan Cancer Institute, Division of Hematology/Oncology, Department of Medicine, Warren Alpert Medical School, Brown University, Providence, RI, USA
| | - Louise Carter
- Division of Cancer Sciences, University of Manchester and the Christie NHS Foundation Trust, Manchester, UK
| | - Ruth Plummer
- Newcastle University and Newcastle Hospitals NHS Foundation Trust, Northern Centre for Cancer Care, Newcastle-upon-Tyne, UK
| | - Gregory M Cote
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | - Funda Meric-Bernstam
- Department of Investigational Cancer Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | | | | | | | | | | | - Yi Xu
- Repare Therapeutics, Cambridge, MA, USA
| | | | | | | | | | | | - Jorge S Reis-Filho
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Ezra Rosen
- Department of Medical Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
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DNA Damage and Its Role in Cancer Therapeutics. Int J Mol Sci 2023; 24:ijms24054741. [PMID: 36902170 PMCID: PMC10003233 DOI: 10.3390/ijms24054741] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 02/22/2023] [Accepted: 02/23/2023] [Indexed: 03/05/2023] Open
Abstract
DNA damage is a double-edged sword in cancer cells. On the one hand, DNA damage exacerbates gene mutation frequency and cancer risk. Mutations in key DNA repair genes, such as breast cancer 1 (BRCA1) and/or breast cancer 2 (BRCA2), induce genomic instability and promote tumorigenesis. On the other hand, the induction of DNA damage using chemical reagents or radiation kills cancer cells effectively. Cancer-burdening mutations in key DNA repair-related genes imply relatively high sensitivity to chemotherapy or radiotherapy because of reduced DNA repair efficiency. Therefore, designing specific inhibitors targeting key enzymes in the DNA repair pathway is an effective way to induce synthetic lethality with chemotherapy or radiotherapy in cancer therapeutics. This study reviews the general pathways involved in DNA repair in cancer cells and the potential proteins that could be targeted for cancer therapeutics.
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Tong J, Hu C, Wu Y, Liu Q, Sun D. Radiation-induced NF-κB activation is involved in cochlear damage in mice via promotion of a local inflammatory response. JOURNAL OF RADIATION RESEARCH 2023; 64:63-72. [PMID: 36253086 PMCID: PMC9855318 DOI: 10.1093/jrr/rrac068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 09/08/2022] [Indexed: 06/16/2023]
Abstract
The radiation-induced inflammatory response is involved in radiation damage to the cochlea and causes sensorineural hearing loss (SNHL). NF-κB, as the master switch of the inflammatory response, regulates the expression of many inflammation-related genes and thus the inflammatory response. Therefore, in this study we used a mouse model to determine whether radiation-induced NF-κB activation is involved in damage to the cochlea and to investigate the underlying mechanism. Eventually, we found that NF-κB was activated after radiation of the cochleae and the activation reached a maximum at 2-6 h after radiation. And morphological analysis showed severe damage to the cochleae after radiation, but this damage was significantly ameliorated by JSH-23 (an inhibitor of NF-κB) pretreatment. Along with these morphological changes, the expression levels of proinflammatory molecules (including proinflammatory cytokines IL-6, TNF-α, COX-2 and inflammation-related proteins VCAM-1, MIP-1β) in the cochlear tissues were significantly increased after radiation, but were significantly decreased by JSH-23 pretreatment compared to radiation alone. Therefore, these results indicated that radiation-induced NF-κB activation was involved in damage to the cochleae and resultant SNHL via its promotion of the inflammatory response mediated by overexpression of some proinflammatory molecules in cochlear tissues, and inhibition of radiation-induced NF-κB was conducive to preventing such damage.
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Affiliation(s)
- Jiaojiao Tong
- Cancer Center, the Second Hospital of Shandong University, Jinan, Shandong Province 250033, China
| | - Chunhui Hu
- Cancer Center, the Second Hospital of Shandong University, Jinan, Shandong Province 250033, China
| | - Yuqian Wu
- Cancer Center, the Second Hospital of Shandong University, Jinan, Shandong Province 250033, China
| | - Qin Liu
- Cancer Center, the Second Hospital of Shandong University, Jinan, Shandong Province 250033, China
| | - Dianshui Sun
- Corresponding author. Cancer Center, the Second Hospital of Shandong University, No.247 Beiyuan Road, Jinan, Shandong Province, 250033, China. Tel: +86 13583111990;
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Factors to Consider for the Correct Use of γH2AX in the Evaluation of DNA Double-Strand Breaks Damage Caused by Ionizing Radiation. Cancers (Basel) 2022; 14:cancers14246204. [PMID: 36551689 PMCID: PMC9776434 DOI: 10.3390/cancers14246204] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/07/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022] Open
Abstract
People exposed to ionizing radiation (IR) both for diagnostic and therapeutic purposes is constantly increasing. Since the use of IR involves a risk of harmful effects, such as the DNA DSB induction, an accurate determination of this induced DNA damage and a correct evaluation of the risk-benefit ratio in the clinical field are of key relevance. γH2AX (the phosphorylated form of the histone variant H2AX) is a very early marker of DSBs that can be induced both in physiological conditions, such as in the absence of specific external agents, and by external factors such as smoking, heat, background environmental radiation, and drugs. All these internal and external conditions result in a basal level of γH2AX which must be considered for the correct assessment of the DSBs after IR exposure. In this review we analyze the most common conditions that induce H2AX phosphorylation, including specific exogenous stimuli, cellular states, basic environmental factors, and lifestyles. Moreover, we discuss the most widely used methods for γH2AX determination and describe the principal applications of γH2AX scoring, paying particular attention to clinical studies. This knowledge will help us optimize the use of available methods in order to discern the specific γH2AX following IR-induced DSBs from the basal level of γH2AX in the cells.
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Erickson JR, Kalejta RF, Friesen PD. Ataxia Telangiectasia-Mutated Is Activated but Not Required for Productive Autographa californica Multiple Nucleopolyhedrovirus Infection. J Virol 2022; 96:e0126922. [PMID: 36314821 PMCID: PMC9682986 DOI: 10.1128/jvi.01269-22] [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: 08/12/2022] [Accepted: 10/07/2022] [Indexed: 11/05/2022] Open
Abstract
Multiplication of the invertebrate DNA baculoviruses activates the host DNA damage response (DDR), which promotes virus DNA replication. DDR signaling is initiated by the host insect's phosphatidylinositol-3 kinase-related kinases (PIKKs), including ataxia telangiectasia-mutated kinase (ATM). Like other PIKKs, ATM phosphorylates an array of host DDR proteins at serine/threonine glutamine (S/TQ) motifs, the result of which leads to cell cycle arrest, DNA repair, or apoptosis. To define the role of host PIKKs in baculovirus replication, we compared replication levels of the baculovirus prototype species Autographa californica multiple nucleopolyhedrovirus in permissive Spodoptera frugiperda (SF21) cells with and without ATM function. Caffeine, which inhibits multiple DDR kinases, and the ATM-specific inhibitors KU-55933 and KU-60019 each prevented phosphorylation of Spodoptera histone H2AX (SfH2AX), a recognized indicator of ATM activity. However, only caffeine reduced autographa californica multiple nucleopolyhedrovirus (AcMNPV)-induced bulk phosphorylation of S/TQ protein motifs. Furthermore, only caffeine, not KU-55933 or KU-60019, reduced AcMNPV yields, suggesting a limited role for ATM. To investigate further, we identified and edited the Spodoptera ATM gene (sfatm). Consistent with ATM's known functions, CRISPR/Cas9-mediated knockout of sfatm eliminated DNA damage-induced phosphorylation of DDR marker SfH2AX in SF21 cells. However, loss of sfatm failed to affect the levels of AcMNPV multiplication. These findings suggested that in the absence of the kinase SfATM, another caffeine-sensitive host DDR kinase promotes S/TQ phosphorylation and baculovirus multiplication. Thus, baculoviruses activate and utilize the host insect DDR in an ATM-independent manner. IMPORTANCE The DDR, while necessary for the maintenance and fidelity of the host genome, represents an important cellular response to viral infection. The prolific DNA baculoviruses activate and manipulate the invertebrate DDR by using mechanisms that positively impact virus multiplication, including virus DNA replication. As the key DDR initiator kinase, ATM was suspected to play a critical role in this host response. However, we show here that baculovirus AcMNPV activates an ATM-independent DDR. By identifying the insect host ATM ortholog (Spodoptera frugiperda SfATM) and evaluating genetic knockouts, we show that SfATM is dispensable for AcMNPV activation of the DDR and for virus replication. Thus, another PIKK, possibly the closely related kinase ATR (ATM- and Rad3-related kinase), is responsible for efficient baculovirus multiplication. These findings better define the host pathways used by invertebrates to engage viral pathogens, including DNA viruses.
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Affiliation(s)
- Jared R. Erickson
- Institute for Molecular Virology, University of Wisconsin-Madison, Madison, Wisconsin, USA
- Microbiology Doctoral Training Program, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Robert F. Kalejta
- Institute for Molecular Virology, University of Wisconsin-Madison, Madison, Wisconsin, USA
- Microbiology Doctoral Training Program, University of Wisconsin-Madison, Madison, Wisconsin, USA
- McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Paul D. Friesen
- Institute for Molecular Virology, University of Wisconsin-Madison, Madison, Wisconsin, USA
- Microbiology Doctoral Training Program, University of Wisconsin-Madison, Madison, Wisconsin, USA
- Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin, USA
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9
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Islam MZ, Shen X, Pardue S, Kevil CG, Shackelford RE. The ataxia-telangiectasia mutated gene product regulates the cellular acid-labile sulfide fraction. DNA Repair (Amst) 2022; 116:103344. [PMID: 35696854 PMCID: PMC11118069 DOI: 10.1016/j.dnarep.2022.103344] [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: 03/08/2022] [Revised: 04/30/2022] [Accepted: 05/11/2022] [Indexed: 11/03/2022]
Abstract
The ataxia-telangiectasia mutated (ATM) protein regulates cell cycle checkpoints, the cellular redox state, and double-stranded DNA break repair. ATM loss causes the disorder ataxia-telangiectasia (A-T), distinguished by ataxia, telangiectasias, dysregulated cellular redox and iron responses, and an increased cancer risk. We examined the sulfur pool in A-T cells, with and without an ATM expression vector. While free and bound sulfide levels were not changed with ATM expression, the acid-labile sulfide faction was significantly increased. ATM expression also increased cysteine desulfurase (NFS1), NFU1 iron-sulfur cluster scaffold homolog protein, and several mitochondrial complex I proteins' expression. Additionally, ATM expression suppressed cystathionine β-synthase and cystathionine γ-synthase protein expression, cystathionine γ-synthase enzymatic activity, and increased the reduced to oxidized glutathione ratio. This last observation is interesting, as dysregulated glutathione is implicated in A-T pathology. As ATM expression increases the expression of proteins central in initiating 2Fe-2S and 4Fe-4S cluster formation (NFS1 and NFU1, respectively), and the acid-labile sulfide faction is composed of sulfur incorporated into Fe-S clusters, our data indicates that ATM regulates aspects of Fe-S cluster biosynthesis, the transsulfuration pathway, and glutathione redox cycling. Thus, our data may explain some of the redox- and iron-related pathologies seen in A-T.
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Affiliation(s)
- Mohammad Z Islam
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, LA 71130, United States
| | - Xinggui Shen
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, LA 71130, United States
| | - Sibile Pardue
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, LA 71130, United States
| | - Christopher G Kevil
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, LA 71130, United States
| | - Rodney E Shackelford
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, LA 71130, United States.
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10
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Maksoud S. The DNA Double-Strand Break Repair in Glioma: Molecular Players and Therapeutic Strategies. Mol Neurobiol 2022; 59:5326-5365. [PMID: 35696013 DOI: 10.1007/s12035-022-02915-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 06/05/2022] [Indexed: 12/12/2022]
Abstract
Gliomas are the most frequent type of tumor in the central nervous system, which exhibit properties that make their treatment difficult, such as cellular infiltration, heterogeneity, and the presence of stem-like cells responsible for tumor recurrence. The response of this type of tumor to chemoradiotherapy is poor, possibly due to a higher repair activity of the genetic material, among other causes. The DNA double-strand breaks are an important type of lesion to the genetic material, which have the potential to trigger processes of cell death or cause gene aberrations that could promote tumorigenesis. This review describes how the different cellular elements regulate the formation of DNA double-strand breaks and their repair in gliomas, discussing the therapeutic potential of the induction of this type of lesion and the suppression of its repair as a control mechanism of brain tumorigenesis.
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Affiliation(s)
- Semer Maksoud
- Experimental Therapeutics and Molecular Imaging Unit, Department of Neurology, Neuro-Oncology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA.
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11
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Ndembe G, Intini I, Perin E, Marabese M, Caiola E, Mendogni P, Rosso L, Broggini M, Colombo M. LKB1: Can We Target an Hidden Target? Focus on NSCLC. Front Oncol 2022; 12:889826. [PMID: 35646638 PMCID: PMC9131655 DOI: 10.3389/fonc.2022.889826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 04/14/2022] [Indexed: 11/13/2022] Open
Abstract
LKB1 (liver kinase B1) is a master regulator of several processes such as metabolism, proliferation, cell polarity and immunity. About one third of non-small cell lung cancers (NSCLCs) present LKB1 alterations, which almost invariably lead to protein loss, resulting in the absence of a potential druggable target. In addition, LKB1-null tumors are very aggressive and resistant to chemotherapy, targeted therapies and immune checkpoint inhibitors (ICIs). In this review, we report and comment strategies that exploit peculiar co-vulnerabilities to effectively treat this subgroup of NSCLCs. LKB1 loss leads to an enhanced metabolic avidity, and treatments inducing metabolic stress were successful in inhibiting tumor growth in several preclinical models. Biguanides, by compromising mitochondria and reducing systemic glucose availability, and the glutaminase inhibitor telaglenastat (CB-839), inhibiting glutamate production and reducing carbon intermediates essential for TCA cycle progression, have provided the most interesting results and entered different clinical trials enrolling also LKB1-null NSCLC patients. Nutrient deprivation has been investigated as an alternative therapeutic intervention, giving rise to interesting results exploitable to design specific dietetic regimens able to counteract cancer progression. Other strategies aimed at targeting LKB1-null NSCLCs exploit its pivotal role in modulating cell proliferation and cell invasion. Several inhibitors of LKB1 downstream proteins, such as mTOR, MEK, ERK and SRK/FAK, resulted specifically active on LKB1-mutated preclinical models and, being molecules already in clinical experimentation, could be soon proposed as a specific therapy for these patients. In particular, the rational use in combination of these inhibitors represents a very promising strategy to prevent the activation of collateral pathways and possibly avoid the potential emergence of resistance to these drugs. LKB1-null phenotype has been correlated to ICIs resistance but several studies have already proposed the mechanisms involved and potential interventions. Interestingly, emerging data highlighted that LKB1 alterations represent positive determinants to the new KRAS specific inhibitors response in KRAS co-mutated NSCLCs. In conclusion, the absence of the target did not block the development of treatments able to hit LKB1-mutated NSCLCs acting on several fronts. This will give patients a concrete chance to finally benefit from an effective therapy.
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Affiliation(s)
- Gloriana Ndembe
- Laboratory of Molecular Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - Ilenia Intini
- Laboratory of Molecular Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - Elisa Perin
- Laboratory of Molecular Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - Mirko Marabese
- Laboratory of Molecular Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - Elisa Caiola
- Laboratory of Molecular Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - Paolo Mendogni
- Thoracic Surgery and Lung Transplantation Unit, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Lorenzo Rosso
- Thoracic Surgery and Lung Transplantation Unit, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.,Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Massimo Broggini
- Laboratory of Molecular Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - Marika Colombo
- Laboratory of Molecular Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
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12
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Aengenvoort J, Sekeres M, Proksch P, Fritz G. Targeting Mechanisms of the DNA Damage Response (DDR) and DNA Repair by Natural Compounds to Improve cAT-Triggered Tumor Cell Death. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27113567. [PMID: 35684504 PMCID: PMC9182506 DOI: 10.3390/molecules27113567] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 05/11/2022] [Accepted: 05/26/2022] [Indexed: 12/20/2022]
Abstract
Recently, we identified secalonic acid F (SA), 5-epi-nakijiquinone Q (NQ) and 5-epi-ilimaquinone (IQ) as natural compounds (NC) affecting mechanisms of the DNA damage response (DDR). Here, we further characterized their effects on DDR, DNA repair and cytotoxicity if used in mono- and co-treatment with conventional anticancer therapeutics (cAT) (cisplatin (Cis), doxorubicin (Doxo)) in vitro. All three NC influence the phosphorylation level of selected DDR-related factors (i.e., pCHK1, pKAP1, pP53, pRPA32) in mono- and/or co-treatment. Both SA and NQ attenuate the Cis- and Doxo-induced G2/M-phase arrest and effectively stimulate caspase-mediated apoptosis. Notably, SA impacts DNA repair as reflected by enhanced steady-state levels of Cis-(1,2-GpG)-DNA adducts and Doxo-induced DNA double-strand breaks (DSB). Moreover, SA decreased the mRNA and protein expression of the homologous recombination (HR)-related DSB repair factors RAD51 and BRCA1. Both SA and NQ promote Cis- and Doxo-induced cytotoxicity in an additive to synergistic manner (CI ≤ 1.0). Summarizing, we conclude that SA promotes cAT-driven caspase-dependent cell death by interfering with DSB repair and DDR-related checkpoint control mechanisms. Hence, SA is considered as the most promising lead compound to evaluate its therapeutic window in forthcoming pre-clinical in vivo studies.
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Affiliation(s)
- Jana Aengenvoort
- Institute of Toxicology, Medical Faculty, Heinrich-Heine University Düsseldorf, Moorenstrasse 5, 40225 Düsseldorf, Germany; (J.A.); (M.S.)
| | - Marlena Sekeres
- Institute of Toxicology, Medical Faculty, Heinrich-Heine University Düsseldorf, Moorenstrasse 5, 40225 Düsseldorf, Germany; (J.A.); (M.S.)
| | - Peter Proksch
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich-Heine University Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany;
| | - Gerhard Fritz
- Institute of Toxicology, Medical Faculty, Heinrich-Heine University Düsseldorf, Moorenstrasse 5, 40225 Düsseldorf, Germany; (J.A.); (M.S.)
- Correspondence: ; Tel.: +49-211-8113022
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13
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Wang H, Yang L, Liu M, Luo J. Protein post-translational modifications in the regulation of cancer hallmarks. Cancer Gene Ther 2022; 30:529-547. [PMID: 35393571 DOI: 10.1038/s41417-022-00464-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 02/28/2022] [Accepted: 03/18/2022] [Indexed: 12/12/2022]
Abstract
Posttranslational modifications (PTMs) of proteins, the major mechanism of protein function regulation, play important roles in regulating a variety of cellular physiological and pathological processes. Although the classical PTMs, such as phosphorylation, acetylation, ubiquitination and methylation, have been well studied, the emergence of many new modifications, such as succinylation, hydroxybutyrylation, and lactylation, introduces a new layer to protein regulation, leaving much more to be explored and wide application prospects. In this review, we will provide a broad overview of the significant roles of PTMs in regulating human cancer hallmarks through selecting a diverse set of examples, and update the current advances in the therapeutic implications of these PTMs in human cancer.
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Affiliation(s)
- Haiying Wang
- Beijing Key Laboratory of Protein Posttranslational Modifications and Cell Function, Department of Biochemistry and Biophysics, School of Basic Medical Sciences, Peking University Health Science Center, 100191, Beijing, China.
| | - Liqian Yang
- Beijing Key Laboratory of Protein Posttranslational Modifications and Cell Function, Department of Biochemistry and Biophysics, School of Basic Medical Sciences, Peking University Health Science Center, 100191, Beijing, China
| | - Minghui Liu
- Department of Medical Genetics, Center for Medical Genetics, Peking University Health Science Center, 100191, Beijing, China
| | - Jianyuan Luo
- Beijing Key Laboratory of Protein Posttranslational Modifications and Cell Function, Department of Biochemistry and Biophysics, School of Basic Medical Sciences, Peking University Health Science Center, 100191, Beijing, China. .,Department of Medical Genetics, Center for Medical Genetics, Peking University Health Science Center, 100191, Beijing, China.
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14
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The large nonstructural protein (NS1) of the human bocavirus 1 (HBoV1) directly interacts with Ku70, which plays an important role in virus replication in human airway epithelia. J Virol 2021; 96:e0184021. [PMID: 34878919 PMCID: PMC8865542 DOI: 10.1128/jvi.01840-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Human bocavirus 1 (HBoV1), an autonomous human parvovirus, causes acute respiratory tract infections in young children. HBoV1 infects well-differentiated (polarized) human airway epithelium cultured at an air-liquid interface (HAE-ALI). HBoV1 expresses a large nonstructural protein, NS1, that is essential for viral DNA replication. HBoV1 infection of polarized human airway epithelial cells induces a DNA damage response (DDR) that is critical to viral DNA replication involving DNA repair with error-free Y-family DNA polymerases. HBoV1 NS1 or the isoform NS1-70 per se induces a DDR. In this study, using the second-generation proximity-dependent biotin identification (BioID2) approach, we identified that Ku70 is associated with the NS1-BioID2 pulldown complex through a direct interaction with NS1. Biolayer interferometry (BLI) assay determined a high binding affinity of NS1 with Ku70, which has an equilibrium dissociation constant (KD) value of 0.16 μM and processes the strongest interaction at the C-terminal domain. The association of Ku70 with NS1 was also revealed during HBoV1 infection of HAE-ALI. Knockdown of Ku70 and overexpression of the C-terminal domain of Ku70 significantly decreased HBoV1 replication in HAE-ALI. Thus, our study provides, for the first time, a direct interaction of parvovirus large nonstructural protein NS1 with Ku70. IMPORTANCE Parvovirus infection induces a DNA damage response (DDR) that plays a pivotal role in viral DNA replication. The DDR includes activation of ATM (ataxia telangiectasia mutated), ATR (ATM- and RAD3-related), and DNA-PKcs (DNA-dependent protein kinase catalytic subunit). The large nonstructural protein (NS1) often plays a role in the induction of DDR; however, how the DDR is induced during parvovirus infection or simply by the NS1 is not well studied. Activation of DNA-PKcs has been shown as one of the key DDR pathways in DNA replication of HBoV1. We identified that HBoV1 NS1 directly interacts with Ku70, but not Ku80, of the Ku70/Ku80 heterodimer at high affinity. This interaction is also important for HBoV1 replication in HAE-ALI. We propose that the interaction of NS1 with Ku70 recruits the Ku70/Ku80 complex to the viral DNA replication center, which activates DNA-PKcs and facilitates viral DNA replication.
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15
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Targeting the DNA damage response: PARP inhibitors and new perspectives in the landscape of cancer treatment. Crit Rev Oncol Hematol 2021; 168:103539. [PMID: 34800653 DOI: 10.1016/j.critrevonc.2021.103539] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 09/26/2021] [Accepted: 11/15/2021] [Indexed: 12/27/2022] Open
Abstract
Cancer derives from alterations of pathways responsible for cell survival, differentiation and proliferation. Dysfunctions of mechanisms protecting genome integrity can promote oncogenesis but can also be exploited as therapeutic target. Poly-ADP-Ribose-Polymerase (PARP)-inhibitors, the first approved targeted agents able to tackle DNA damage response (DDR), have demonstrated antitumor activity, particularly when homologous recombination impairment is present. Despite the relevant results achieved, a large proportion of patients fail to obtain durable responses. The development of innovative treatments, able to overcome resistance and ensure long-lasting benefit for a wider population is still an unmet need. Moreover, improvement in biomarker assays is necessary to properly identify patients who can benefit from DDR targeting agents. Here we summarize the main DDR pathways, explain the current role of PARP inhibitors in cancer therapy and illustrate new therapeutic strategies targeting the DDR, focusing on the combinations of PARP inhibitors with other agents and on cell-cycle checkpoint inhibitors.
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16
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Kizhedathu A, Chhajed P, Yeramala L, Sain Basu D, Mukherjee T, Vinothkumar KR, Guha A. Duox-generated reactive oxygen species activate ATR/Chk1 to induce G2 arrest in Drosophila tracheoblasts. eLife 2021; 10:68636. [PMID: 34622778 PMCID: PMC8594940 DOI: 10.7554/elife.68636] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 10/07/2021] [Indexed: 12/31/2022] Open
Abstract
Progenitors of the thoracic tracheal system of adult Drosophila (tracheoblasts) arrest in G2 during larval life and rekindle a mitotic program subsequently. G2 arrest is dependent on ataxia telangiectasia mutated and rad3-related kinase (ATR)-dependent phosphorylation of checkpoint kinase 1 (Chk1) that is actuated in the absence of detectable DNA damage. We are interested in the mechanisms that activate ATR/Chk1 (Kizhedathu et al., 2018; Kizhedathu et al., 2020). Here we report that levels of reactive oxygen species (ROS) are high in arrested tracheoblasts and decrease upon mitotic re-entry. High ROS is dependent on expression of Duox, an H2O2 generating dual oxidase. ROS quenching by overexpression of superoxide dismutase 1, or by knockdown of Duox, abolishes Chk1 phosphorylation and results in precocious proliferation. Tracheae deficient in Duox, or deficient in both Duox and regulators of DNA damage-dependent ATR/Chk1 activation (ATRIP/TOPBP1/claspin), can induce phosphorylation of Chk1 in response to micromolar concentrations of H2O2 in minutes. The findings presented reveal that H2O2 activates ATR/Chk1 in tracheoblasts by a non-canonical, potentially direct, mechanism.
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Affiliation(s)
- Amrutha Kizhedathu
- Regulation of Cell Fate, Institute for Stem Cell Science and Regenerative Medicine (inStem), Bangalore, India
| | - Piyush Chhajed
- Regulation of Cell Fate, Institute for Stem Cell Science and Regenerative Medicine (inStem), Bangalore, India
| | - Lahari Yeramala
- National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bangalore, India
| | - Deblina Sain Basu
- Regulation of Cell Fate, Institute for Stem Cell Science and Regenerative Medicine (inStem), Bangalore, India.,Trans Disciplinary University, Bangalore, India
| | - Tina Mukherjee
- Regulation of Cell Fate, Institute for Stem Cell Science and Regenerative Medicine (inStem), Bangalore, India
| | - Kutti R Vinothkumar
- National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bangalore, India
| | - Arjun Guha
- Regulation of Cell Fate, Institute for Stem Cell Science and Regenerative Medicine (inStem), Bangalore, India
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17
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Inhibition of the DSB repair protein RAD51 potentiates the cytotoxic efficacy of doxorubicin via promoting apoptosis-related death pathways. Cancer Lett 2021; 520:361-373. [PMID: 34389435 DOI: 10.1016/j.canlet.2021.08.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 07/29/2021] [Accepted: 08/03/2021] [Indexed: 01/04/2023]
Abstract
The anthracycline derivative doxorubicin (Doxo) induces DNA double-strand breaks (DSBs) by inhibition of DNA topoisomerase type II. Defective mismatch repair (MMR) contributes to Doxo resistance and has been reported for colon and mammary carcinomas. Here, we investigated the outcome of pharmacological inhibition of various DNA repair-related mechanisms on Doxo-induced cytotoxicity employing MMR-deficient HCT-116 colon carcinoma cells. Out of different inhibitors tested (i.e. HDACi, PARPi, MRE11i, RAD52i, RAD51i), we identified the RAD51-inhibitor B02 as the most powerful compound to synergistically increase Doxo-induced cytotoxicity. B02-mediated synergism rests on pleiotropic mechanisms, including pronounced G2/M arrest, damage to mitochondria and caspase-driven apoptosis. Of note, B02 also promotes the cytotoxicity of oxaliplatin and 5-fluoruracil (5-FU) in HCT-116 cells and, furthermore, also increases Doxo-induced cytotoxicity in MMR-proficient colon and mammary carcinoma cells. Summarizing, pharmacological inhibition of RAD51 is suggested to synergistically increase the cytotoxic efficacy of various types of conventional anticancer drugs in different tumor entities. Hence, pre-clinical in vivo studies are preferable to determine the therapeutic window of B02 in a clinically oriented therapeutic regimen.
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18
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Wang C, Tang M, Chen Z, Nie L, Li S, Xiong Y, Szymonowicz KA, Park JM, Zhang H, Feng X, Huang M, Su D, Hart T, Chen J. Genetic vulnerabilities upon inhibition of DNA damage response. Nucleic Acids Res 2021; 49:8214-8231. [PMID: 34320214 PMCID: PMC8373146 DOI: 10.1093/nar/gkab643] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 07/06/2021] [Accepted: 07/16/2021] [Indexed: 12/12/2022] Open
Abstract
Because of essential roles of DNA damage response (DDR) in the maintenance of genomic integrity, cellular homeostasis, and tumor suppression, targeting DDR has become a promising therapeutic strategy for cancer treatment. However, the benefits of cancer therapy targeting DDR are limited mainly due to the lack of predictive biomarkers. To address this challenge, we performed CRISPR screens to search for genetic vulnerabilities that affect cells’ response to DDR inhibition. By undertaking CRISPR screens with inhibitors targeting key DDR mediators, i.e. ATR, ATM, DNAPK and CHK1, we obtained a global and unbiased view of genetic interactions with DDR inhibition. Specifically, we identified YWHAE loss as a key determinant of sensitivity to CHK1 inhibition. We showed that KLHL15 loss protects cells from DNA damage induced by ATM inhibition. Moreover, we validated that APEX1 loss sensitizes cells to DNAPK inhibition. Additionally, we compared the synergistic effects of combining different DDR inhibitors and found that an ATM inhibitor plus a PARP inhibitor induced dramatic levels of cell death, probably through promoting apoptosis. Our results enhance the understanding of DDR pathways and will facilitate the use of DDR-targeting agents in cancer therapy.
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Affiliation(s)
- Chao Wang
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Mengfan Tang
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Zhen Chen
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Litong Nie
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Siting Li
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Yun Xiong
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Klaudia Anna Szymonowicz
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Jeong-Min Park
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Huimin Zhang
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Xu Feng
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Min Huang
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Dan Su
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Traver Hart
- Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Junjie Chen
- Departments of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
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19
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Palomino GJQ, Sá NARD, Guerreiro DD, Gomes FDR, da Silva RF, Lopes EPF, Paes VM, Gataí PHS, Alves BG, Pessoa ODL, Figueiredo JR, Rocha RMP, Rodrigues APR. Induced-damages on preantral follicles by withanolide D, a potent chemotherapy candidate are not attenuated by melatonin. Reprod Toxicol 2021; 104:125-133. [PMID: 34274432 DOI: 10.1016/j.reprotox.2021.07.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 07/11/2021] [Accepted: 07/13/2021] [Indexed: 12/14/2022]
Abstract
Withanolide D (WD) has been investigated as an antineoplastic drug. This study aimed to evaluate whether melatonin (MT) could attenuate toxic effects on preantral follicles enclosed in the ovarian cortex (experiment 1 - E1) or on isolated secondary follicles (experiment 2 - E2) exposed to WD. For E1, ovarian cortex was incubated for 48 h to: (1) α-MEM+; (2) α-MEM+ plus 6 μM WD; (3) α-MEM+ plus 3 mmol/L MT or (4) α-MEM+ plus WD and MT. For E2, secondary follicles were exposed for until 96 h in. (1) only to basic medium (α-MEM++/α-MEM++); (2) α-MEM++ plus 3 mmol/L MT (MT/MT); (3) α-MEM++ until 48 h, followed by more 48 h in 6 μM WD (α-MEM++/WD) or (4) a pre-exposure to MT for until 48 h, followed by more 48 h of exposure to WD plus MT (MT/MT + WD). The main results obtained showed that exposure to drugs caused damage to follicular morphology (WD or WD + MT) and diameter (WD) in the ovarian cortex or in isolated follicles. In pre-antral follicles in situ, ATM expression increased in the presence of WD, MT or association. As for the secondary follicles, ATM and γH2AX were immunostained in the granulosa and theca cells and oocytes in all treatments. TAp63α was immunostained in follicles included in the ovarian cortex and in isolated follicles. We conclude that melatonin did not provide protection and could have enhanced the toxic effect of WD to follicles surrounded or not by the ovarian cortex.
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Affiliation(s)
- Gaby Judith Quispe Palomino
- Faculty of Veterinary Medicine, Laboratory of Manipulation of Oocyte and Preantral Follicles (LAMOFOPA), State University of Ceará, Av. Dr. Silas Munguba, 1700, Fortaleza, CE, CEP: 60714-903, Brazil
| | - Naíza Arcângela Ribeiro de Sá
- Faculty of Veterinary Medicine, Laboratory of Manipulation of Oocyte and Preantral Follicles (LAMOFOPA), State University of Ceará, Av. Dr. Silas Munguba, 1700, Fortaleza, CE, CEP: 60714-903, Brazil
| | - Denise Damasceno Guerreiro
- Faculty of Veterinary Medicine, Laboratory of Manipulation of Oocyte and Preantral Follicles (LAMOFOPA), State University of Ceará, Av. Dr. Silas Munguba, 1700, Fortaleza, CE, CEP: 60714-903, Brazil
| | - Francisco Denilson Rodrigues Gomes
- Faculty of Veterinary Medicine, Laboratory of Manipulation of Oocyte and Preantral Follicles (LAMOFOPA), State University of Ceará, Av. Dr. Silas Munguba, 1700, Fortaleza, CE, CEP: 60714-903, Brazil
| | - Renato Félix da Silva
- Faculty of Veterinary Medicine, Laboratory of Manipulation of Oocyte and Preantral Follicles (LAMOFOPA), State University of Ceará, Av. Dr. Silas Munguba, 1700, Fortaleza, CE, CEP: 60714-903, Brazil
| | - Everton Pimentel Ferreira Lopes
- Faculty of Veterinary Medicine, Laboratory of Manipulation of Oocyte and Preantral Follicles (LAMOFOPA), State University of Ceará, Av. Dr. Silas Munguba, 1700, Fortaleza, CE, CEP: 60714-903, Brazil
| | - Victor Macedo Paes
- Faculty of Veterinary Medicine, Laboratory of Manipulation of Oocyte and Preantral Follicles (LAMOFOPA), State University of Ceará, Av. Dr. Silas Munguba, 1700, Fortaleza, CE, CEP: 60714-903, Brazil
| | | | - Benner Geraldo Alves
- Postgraduate Program in Animal Bioscience, Federal University of Goias, Jatai, GO, Brazil
| | | | - José Ricardo Figueiredo
- Faculty of Veterinary Medicine, Laboratory of Manipulation of Oocyte and Preantral Follicles (LAMOFOPA), State University of Ceará, Av. Dr. Silas Munguba, 1700, Fortaleza, CE, CEP: 60714-903, Brazil
| | | | - Ana Paula Ribeiro Rodrigues
- Faculty of Veterinary Medicine, Laboratory of Manipulation of Oocyte and Preantral Follicles (LAMOFOPA), State University of Ceará, Av. Dr. Silas Munguba, 1700, Fortaleza, CE, CEP: 60714-903, Brazil.
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20
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Abstract
In this issue of Cancer Discovery, Yap and colleagues demonstrate in a phase I trial enrolling 22 patients diagnosed with advanced solid tumors that BAY 1895344, a new potent and specific ATR inhibitor, is safe and able to induce durable responses in ATM-deficient tumors. This compelling clinical activity paves the way for innovative combination regimens that rely on exploitation of DNA damage response defects in cancer.See related article by Yap et al., p. 80.
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Affiliation(s)
- Antoine Italiano
- Early Phase Trials Unit, Institut Bergonié, Bordeaux, France. DITEP, Gustave Roussy, Villejuif, France. University of Bordeaux, Bordeaux, France.
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21
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Teroerde M, Nientiedt C, Duensing A, Hohenfellner M, Stenzinger A, Duensing S. Revisiting the Role of p53 in Prostate Cancer. Prostate Cancer 2021. [DOI: 10.36255/exonpublications.prostatecancer.p53.2021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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22
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Koike M, Yutoku Y, Koike A. Inhibition of Crandell-Rees Feline Kidney cell proliferation by X-ray-induced senescence. J Vet Med Sci 2021; 83:798-804. [PMID: 33731502 PMCID: PMC8182323 DOI: 10.1292/jvms.20-0679] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Radioresistance and radiotoxicity have been reported following cancer treatments in felines. Optimizing radiation doses to induce cytotoxic effects to only cancer cells and not normal cells is critical in achieving effective radiation therapy; however, the mechanisms of radiation resistance, radiotoxicity, and DNA damage response (DDR) in feline cells have not yet been elucidated. A DNA double-strand break (DSB) is the most toxic type of DNA damage induced by X-rays and heavy ion beams used in treating cancers. Crandell-Rees Feline Kidney (CRFK) cells is one of the most widely used cat cells in life science research. Here, we report that DSB-triggered senescence induced by X-rays is important in inhibiting the proliferation of CRFK cells. We demonstrated through cell proliferation assay that X-rays at doses 2 Gy and 10 Gy are toxic to CRFK cells that irradiating CRFK cells inhibits their proliferation. In X-irradiated CRFK cells, a dose-dependent increase in DSB-triggered senescence was detected according to morphological changes and using senescence-associated β galactosidase staining assay. Moreover, our data indicated that in CRFK cells, the major DDR pathway, which involves the phosphorylation of H2AX at Ser139, was normally activated by ATM kinases. Our findings are useful in the understanding of X-rays-induced cellular senescence and in elucidating biological effects of radiation, e.g., toxicity, in feline cells. Furthermore, our findings suggest that the CRFK cell line is an excellent matrix for elucidating radioresistance and radiotoxicity in cat cells.
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Affiliation(s)
- Manabu Koike
- National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan.,Department of Regulatory Biology, Faculty of Science, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama-shi, Saitama 338-8570, Japan
| | - Yasutomo Yutoku
- National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Aki Koike
- National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
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23
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El-Far AH, Darwish NHE, Mousa SA. Senescent Colon and Breast Cancer Cells Induced by Doxorubicin Exhibit Enhanced Sensitivity to Curcumin, Caffeine, and Thymoquinone. Integr Cancer Ther 2021; 19:1534735419901160. [PMID: 32054357 PMCID: PMC7025418 DOI: 10.1177/1534735419901160] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Cellular senescence is a process of physiological growth arrest that can be induced by intrinsic or extrinsic stress signals. Some cancer therapies are associated with senescence of cancer cells with a typical cell cycle arrest. Doxorubicin (Dox) induces senescence by a p53-dependent pathway and telomere dysfunction of numerous cancers. However, cellular senescence induces suppression in proliferation activity, and these cells will remain metabolically active and play an important role in tumor relapse and development of drug resistance. In the current study, we investigated the apoptotic effect of curcumin (Cur), caffeine (Caff), and thymoquinone (TQ) on senescent colon cancer HCT116 and breast cancer MCF7 cell lines treated with Dox. Results showed typical senescence markers including decreased bromodeoxyuridine incorporation, increased accumulation of senescence-associated β-galactosidase (SA-β-gal), cell cycle arrest, and upregulation of p53, P-p53, and p21 proteins. Annexin-V analysis by flow cytometry revealed 2- to 6-fold increases in annexin-V–positive cells in Dox-treated MCF7 and HCT116 cells by Cur (15 µM), Caff (10 mM), and TQ (50 µM; P < .001). In comparison between proliferative and senescent of either HCT116 or MCF7 cells, Caff at 15 mM and TQ at 25 µM induced significant increases in apoptosis of Dox-treated cells compared with proliferative cells (P < .001). Data revealed that Cur, Caff, and TQ potentially induced apoptosis of both proliferative and senescent HCT116 and MCF7 cells. In vivo and clinical trials are of great importance to validate this result.
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Affiliation(s)
- Ali H El-Far
- Damanhour University, Damanhour, El-Beheira, Egypt
| | - Noureldien H E Darwish
- Mansoura University, Mansoura, Egypt.,Albany College of Pharmacy and Health Sciences, Rensselaer, NY, USA
| | - Shaker A Mousa
- Albany College of Pharmacy and Health Sciences, Rensselaer, NY, USA
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24
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Li Y, Yuan J. Role of deubiquitinating enzymes in DNA double-strand break repair. J Zhejiang Univ Sci B 2021; 22:63-72. [PMID: 33448188 DOI: 10.1631/jzus.b2000309] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
DNA is the hereditary material in humans and almost all other organisms. It is essential for maintaining accurate transmission of genetic information. In the life cycle, DNA replication, cell division, or genome damage, including that caused by endogenous and exogenous agents, may cause DNA aberrations. Of all forms of DNA damage, DNA double-strand breaks (DSBs) are the most serious. If the repair function is defective, DNA damage may cause gene mutation, genome instability, and cell chromosome loss, which in turn can even lead to tumorigenesis. DNA damage can be repaired through multiple mechanisms. Homologous recombination (HR) and non-homologous end joining (NHEJ) are the two main repair mechanisms for DNA DSBs. Increasing amounts of evidence reveal that protein modifications play an essential role in DNA damage repair. Protein deubiquitination is a vital post-translational modification which removes ubiquitin molecules or polyubiquitinated chains from substrates in order to reverse the ubiquitination reaction. This review discusses the role of deubiquitinating enzymes (DUBs) in repairing DNA DSBs. Exploring the molecular mechanisms of DUB regulation in DSB repair will provide new insights to combat human diseases and develop novel therapeutic approaches.
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Affiliation(s)
- Yunhui Li
- The Key Laboratory of Arrhythmias of the Ministry of Education of China, Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China
| | - Jian Yuan
- The Key Laboratory of Arrhythmias of the Ministry of Education of China, Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, Shanghai 200120, China. .,Department of Biochemistry and Molecular Biology, Tongji University School of Medicine, Shanghai 200092, China.
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25
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Genotoxic stress-activated DNA-PK-p53 cascade and autophagy cooperatively induce ciliogenesis to maintain the DNA damage response. Cell Death Differ 2021; 28:1865-1879. [PMID: 33462409 PMCID: PMC8184926 DOI: 10.1038/s41418-020-00713-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 12/03/2020] [Accepted: 12/16/2020] [Indexed: 11/16/2022] Open
Abstract
The DNA-PK maintains cell survival when DNA damage occurs. In addition, aberrant activation of the DNA-PK induces centrosome amplification, suggesting additional roles for this kinase. Here, we showed that the DNA-PK-p53 cascade induced primary cilia formation (ciliogenesis), thus maintaining the DNA damage response under genotoxic stress. Treatment with genotoxic drugs (etoposide, neocarzinostatin, hydroxyurea, or cisplatin) led to ciliogenesis in human retina (RPE1), trophoblast (HTR8), lung (A459), and mouse Leydig progenitor (TM3) cell lines. Upon genotoxic stress, several DNA damage signaling were activated, but only the DNA-PK-p53 cascade contributed to ciliogenesis, as pharmacological inhibition or genetic depletion of this pathway decreased genotoxic stress-induced ciliogenesis. Interestingly, in addition to localizing to the nucleus, activated DNA-PK localized to the base of the primary cilium (mother centriole) and daughter centriole. Genotoxic stress also induced autophagy. Inhibition of autophagy initiation or lysosomal degradation or depletion of ATG7 decreased genotoxic stress-induced ciliogenesis. Besides, inhibition of ciliogenesis by depletion of IFT88 or CEP164 attenuated the genotoxic stress-induced DNA damage response. Thus, our study uncovered the interplay among genotoxic stress, the primary cilium, and the DNA damage response.
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26
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Nizovoy P, Bellora N, Haridas S, Sun H, Daum C, Barry K, Grigoriev IV, Libkind D, Connell LB, Moliné M. Unique genomic traits for cold adaptation in Naganishia vishniacii, a polyextremophile yeast isolated from Antarctica. FEMS Yeast Res 2020; 21:6000217. [PMID: 33232451 DOI: 10.1093/femsyr/foaa056] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 10/15/2020] [Indexed: 12/15/2022] Open
Abstract
Cold environments impose challenges to organisms. Polyextremophile microorganisms can survive in these conditions thanks to an array of counteracting mechanisms. Naganishia vishniacii, a yeast species hitherto only isolated from McMurdo Dry Valleys, Antarctica, is an example of a polyextremophile. Here we present the first draft genomic sequence of N. vishniacii. Using comparative genomics, we unraveled unique characteristics of cold associated adaptations. 336 putative genes (total: 6183) encoding solute transfers and chaperones, among others, were absent in sister species. Among genes shared by N. vishniacii and its closest related species we found orthologs encompassing possible evidence of positive selection (dN/dS > 1). Genes associated with photoprotection were found in agreement with high solar irradiation exposure. Also genes coding for desaturases and genomic features associated with cold tolerance (i.e. trehalose synthesis and lipid metabolism) were explored. Finally, biases in amino acid usage (namely an enrichment of glutamine and a trend in proline reduction) were observed, possibly conferring increased protein flexibility. To the best of our knowledge, such a combination of mechanisms for cold tolerance has not been previously reported in fungi, making N. vishniacii a unique model for the study of the genetic basis and evolution of cold adaptation strategies.
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Affiliation(s)
- Paula Nizovoy
- Centro de Referencia en Levaduras y Tecnologı́a Cervecera (CRELTEC), Instituto Andino Patagónico de Tecnologı́as Biológicas y Geoambientales (IPATEC) - CONICET / Universidad Nacional del Comahue, San Carlos de Bariloche, Rı́o Negro 8400, Argentina
| | - Nicolás Bellora
- Centro de Referencia en Levaduras y Tecnologı́a Cervecera (CRELTEC), Instituto Andino Patagónico de Tecnologı́as Biológicas y Geoambientales (IPATEC) - CONICET / Universidad Nacional del Comahue, San Carlos de Bariloche, Rı́o Negro 8400, Argentina
| | - Sajeet Haridas
- U.S. Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94598, USA
| | - Hui Sun
- U.S. Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94598, USA
| | - Chris Daum
- U.S. Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94598, USA
| | - Kerrie Barry
- U.S. Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94598, USA
| | - Igor V Grigoriev
- U.S. Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94598, USA.,Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720, USA
| | - Diego Libkind
- Centro de Referencia en Levaduras y Tecnologı́a Cervecera (CRELTEC), Instituto Andino Patagónico de Tecnologı́as Biológicas y Geoambientales (IPATEC) - CONICET / Universidad Nacional del Comahue, San Carlos de Bariloche, Rı́o Negro 8400, Argentina
| | - Laurie B Connell
- School of Marine Sciences, University of Maine, Orono, ME 04469, USA
| | - Martín Moliné
- Centro de Referencia en Levaduras y Tecnologı́a Cervecera (CRELTEC), Instituto Andino Patagónico de Tecnologı́as Biológicas y Geoambientales (IPATEC) - CONICET / Universidad Nacional del Comahue, San Carlos de Bariloche, Rı́o Negro 8400, Argentina
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27
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Yu S, Zhang C, Xie KP. Therapeutic resistance of pancreatic cancer: Roadmap to its reversal. Biochim Biophys Acta Rev Cancer 2020; 1875:188461. [PMID: 33157162 DOI: 10.1016/j.bbcan.2020.188461] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 10/20/2020] [Accepted: 10/24/2020] [Indexed: 02/07/2023]
Abstract
Pancreatic cancer is a lethal disease with limited opportunity for resectable surgery as the first choice for cure due to its late diagnosis and early metastasis. The desmoplastic stroma and cellular genetic or epigenetic alterations of pancreatic cancer impose physical and biological barriers to effective therapies, including chemotherapy, radiotherapy, targeted therapy, and immunotherapy. Here, we review the current therapeutic options for pancreatic cancer, and underlying mechanisms and potential reversal of therapeutic resistance, a hallmark of this deadly disease.
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Affiliation(s)
- Sen Yu
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital Affiliated to the South China University of Technology, School of Medicine, Guangzhou, Guangdong, People's Republic of China
| | - Chunyu Zhang
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital Affiliated to the South China University of Technology, School of Medicine, Guangzhou, Guangdong, People's Republic of China
| | - Ke-Ping Xie
- Department of Gastroenterology and Hepatology, Guangzhou First People's Hospital Affiliated to the South China University of Technology, School of Medicine, Guangzhou, Guangdong, People's Republic of China.
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28
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Shackelford R, Ozluk E, Islam MZ, Hopper B, Meram A, Ghali G, Kevil CG. Hydrogen sulfide and DNA repair. Redox Biol 2020; 38:101675. [PMID: 33202302 PMCID: PMC7677119 DOI: 10.1016/j.redox.2020.101675] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 07/12/2020] [Accepted: 08/02/2020] [Indexed: 12/28/2022] Open
Abstract
Recent evidence has revealed that exposing cells to exogenous H 2 S or inhibiting cellular H 2 S synthesis can modulate cell cycle checkpoints, DNA damage and repair, and the expression of proteins involved in the maintenance of genomic stability, all suggesting that H 2 S plays an important role in the DNA damage response (DDR). Here we review the role of H 2 S in the DRR and maintenance of genomic stability. Treatment of various cell types with pharmacologic H 2 S donors or cellular H 2 S synthesis inhibitors modulate the G 1 checkpoint, inhibition of DNA synthesis, and cause p21, and p53 induction. Moreover, in some cell models H 2 S exposure induces PARP-1 and g-H2AX foci formation, increases PCNA, CHK2, Ku70, Ku80, and DNA polymerase-d protein expression, and maintains mitochondrial genomic stability. Our group has also revealed that H 2 S bioavailability and the ATR kinase regulate each other with ATR inhibition lowering cellular H 2 S concentrations, whereas intracellular H 2 S concentrations regulate ATR kinase activity via ATR serine 435 phosphorylation. In summary, these findings have many implications for the DDR, for cancer chemotherapy, and fundamental biochemical metabolic pathways involving H 2 S. Inhibition of the ATR kinase lowers intracellular H2S concentrations. Inhibition of H2S synthesis activates the ATR kinase and increases its kinase activity. Inhibition of H2S synthesis combined with low-level oxidative stress increases genomic instability. These findings may have applications the cancer chemotherapeutics.
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Affiliation(s)
- Rodney Shackelford
- LSU Health Shreveport, Department of Pathology, Shreveport, LA, United States.
| | - Ekin Ozluk
- Department of Pathology & Translational Pathobiology, Louisiana State University Health Sciences Center, Shreveport, LA, 71130, United States
| | - Mohammad Z Islam
- Department of Pathology & Translational Pathobiology, Louisiana State University Health Sciences Center, Shreveport, LA, 71130, United States
| | - Brian Hopper
- Department of Pathology & Translational Pathobiology, Louisiana State University Health Sciences Center, Shreveport, LA, 71130, United States
| | - Andrew Meram
- Head & Neck Oncologic/Microvascular Reconstructive Surgery Department of Oral & Maxillofacial/Head & Neck Surgery, Louisiana State University Health Sciences Center, Shreveport, LA, 71130, United States
| | - Ghali Ghali
- Head & Neck Oncologic/Microvascular Reconstructive Surgery Department of Oral & Maxillofacial/Head & Neck Surgery, Louisiana State University Health Sciences Center, Shreveport, LA, 71130, United States
| | - Christopher G Kevil
- Department of Pathology & Translational Pathobiology, Louisiana State University Health Sciences Center, Shreveport, LA, 71130, United States
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29
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Yap TA, Tan DSP, Terbuch A, Caldwell R, Guo C, Goh BC, Heong V, Haris NRM, Bashir S, Drew Y, Hong DS, Meric-Bernstam F, Wilkinson G, Hreiki J, Wengner AM, Bladt F, Schlicker A, Ludwig M, Zhou Y, Liu L, Bordia S, Plummer R, Lagkadinou E, de Bono JS. First-in-Human Trial of the Oral Ataxia Telangiectasia and RAD3-Related (ATR) Inhibitor BAY 1895344 in Patients with Advanced Solid Tumors. Cancer Discov 2020; 11:80-91. [PMID: 32988960 DOI: 10.1158/2159-8290.cd-20-0868] [Citation(s) in RCA: 132] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 07/31/2020] [Accepted: 08/21/2020] [Indexed: 11/16/2022]
Abstract
Targeting the ataxia telangiectasia and RAD3-related (ATR) enzyme represents a promising anticancer strategy for tumors with DNA damage response (DDR) defects and replication stress, including inactivation of ataxia telangiectasia mutated (ATM) signaling. We report the dose-escalation portion of the phase I first-in-human trial of oral ATR inhibitor BAY 1895344 intermittently dosed 5 to 80 mg twice daily in 21 patients with advanced solid tumors. The MTD was 40 mg twice daily 3 days on/4 days off. Most common adverse events were manageable and reversible hematologic toxicities. Partial responses were achieved in 4 patients and stable disease in 8 patients. Median duration of response was 315.5 days. Responders had ATM protein loss and/or deleterious ATM mutations and received doses ≥40 mg twice daily. Overall, BAY 1895344 is well tolerated, with antitumor activity against cancers with certain DDR defects, including ATM loss. An expansion phase continues in patients with DDR deficiency. SIGNIFICANCE: Oral BAY 1895344 was tolerable, with antitumor activity in heavily pretreated patients with various advanced solid tumors, particularly those with ATM deleterious mutations and/or loss of ATM protein; pharmacodynamic results supported a mechanism of action of increased DNA damage. Further study is warranted in this patient population.See related commentary by Italiano, p. 14.This article is highlighted in the In This Issue feature, p. 1.
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Affiliation(s)
- Timothy A Yap
- The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - David S P Tan
- National University Cancer Institute and National University Hospital and Cancer Science Institute, National University of Singapore, Singapore
| | - Angelika Terbuch
- The Royal Marsden NHS Foundation Trust and The Institute of Cancer Research, Sutton, United Kingdom.,Division of Oncology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Reece Caldwell
- The Royal Marsden NHS Foundation Trust and The Institute of Cancer Research, Sutton, United Kingdom
| | - Christina Guo
- The Royal Marsden NHS Foundation Trust and The Institute of Cancer Research, Sutton, United Kingdom
| | - Boon Cher Goh
- National University Cancer Institute and National University Hospital and Cancer Science Institute, National University of Singapore, Singapore
| | - Valerie Heong
- National University Cancer Institute and National University Hospital and Cancer Science Institute, National University of Singapore, Singapore
| | - Noor R Md Haris
- Translational and Clinical Research Institute, Newcastle University and Northern Centre for Cancer Care, Newcastle, United Kingdom
| | - Saira Bashir
- Translational and Clinical Research Institute, Newcastle University and Northern Centre for Cancer Care, Newcastle, United Kingdom
| | - Yvette Drew
- Translational and Clinical Research Institute, Newcastle University and Northern Centre for Cancer Care, Newcastle, United Kingdom
| | - David S Hong
- The University of Texas MD Anderson Cancer Center, Houston, Texas
| | | | | | - Joseph Hreiki
- Bayer HealthCare Pharmaceuticals, Inc., Whippany, New Jersey
| | | | | | | | | | - Yinghui Zhou
- Bayer HealthCare Pharmaceuticals, Inc., Whippany, New Jersey
| | - Li Liu
- Bayer HealthCare Pharmaceuticals, Inc., Whippany, New Jersey
| | - Sonal Bordia
- Bayer HealthCare Pharmaceuticals, Inc., Whippany, New Jersey
| | - Ruth Plummer
- Translational and Clinical Research Institute, Newcastle University and Northern Centre for Cancer Care, Newcastle, United Kingdom
| | | | - Johann S de Bono
- The Royal Marsden NHS Foundation Trust and The Institute of Cancer Research, Sutton, United Kingdom.
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30
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Lei Y, Gan H, Huang Y, Chen Y, Chen L, Shan A, Zhao H, Wu M, Li X, Ma Q, Wang J, Zhang E, Zhang J, Li Y, Xue F, Deng L. Digitoxin inhibits proliferation of multidrug-resistant HepG2 cells through G 2/M cell cycle arrest and apoptosis. Oncol Lett 2020; 20:71. [PMID: 32863904 PMCID: PMC7436926 DOI: 10.3892/ol.2020.11932] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 06/30/2020] [Indexed: 12/20/2022] Open
Abstract
Hepatocellular carcinoma (HCC) remains a challenge in the medical field due to its high malignancy and mortality rates particularly for HCC, which has developed multidrug resistance. Therefore, the identification of efficient chemotherapeutic drugs for multidrug resistant HCC has become an urgent issue. Natural products have always been of significance in drug discovery. In the present study, a cell-based method was used to screen a natural compound library, which consisted of 78 compounds, and the doxorubicin-resistant cancer cell line, HepG2/ADM, as screening tools. The findings of the present study led to the shortlisting of one of the compounds, digitoxin, which displayed an inhibitory effect on HepG2/ADM cells, with 50% inhibitory concentration values of 132.65±3.83, 52.29±6.26, and 9.13±3.67 nM for 24, 48, and 72 h, respectively. Immunofluorescence, western blotting and cell cycle analyses revealed that digitoxin induced G2/M cell cycle arrest via the serine/threonine-protein kinase ATR (ATR)-serine/threonine-protein kinase Chk2 (CHK2)-M-phase inducer phosphatase 3 (CDC25C) signaling pathway in HepG2/ADM cells, which may have resulted from a DNA double-stranded break. Digitoxin also induced mitochondrial apoptosis, which was characterized by changes in the interaction between Bcl-2 and Bax, the release of cytochrome c, as well as the activation of the caspase-3 and −9. To the best of our knowledge, the present study is the first report that digitoxin displays an anti-HCC effect on HepG2/ADM cells through G2/M cell cycle arrest, which was mediated by the ATR-CHK2-CDC25C signaling pathway and mitochondrial apoptosis. Therefore, digitoxin could be a promising chemotherapeutic agent for the treatment of patients with HCC.
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Affiliation(s)
- Yuhe Lei
- Department of Pharmacy, Shenzhen Hospital of Guangzhou University of Chinese Medicine, Shenzhen, Guangdong 518034, P.R. China
| | - Hua Gan
- Formula Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Yuqing Huang
- Formula Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Yueyue Chen
- Formula Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Lei Chen
- Department of Pharmacy, Shenzhen Hospital of Guangzhou University of Chinese Medicine, Shenzhen, Guangdong 518034, P.R. China
| | - Aiyun Shan
- Department of Pharmacy, Shenzhen Hospital of Guangzhou University of Chinese Medicine, Shenzhen, Guangdong 518034, P.R. China
| | - Huan Zhao
- Formula Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Mansi Wu
- Formula Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Xiaojuan Li
- Formula Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Qingyu Ma
- Formula Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Jing Wang
- Formula Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Enxin Zhang
- Department of Oncology, Shenzhen Hospital of Guangzhou University of Chinese Medicine, Shenzhen, Guangdong 518034, P.R. China
| | - Jiayan Zhang
- College of Chemistry and Materials Engineering, Huaihua University, Huaihua, Hunan 418000, P.R. China
| | - Yuanxiang Li
- College of Chemistry and Materials Engineering, Huaihua University, Huaihua, Hunan 418000, P.R. China
| | - Feifei Xue
- Formula Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Lijuan Deng
- Formula Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
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31
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Wang CY, Tsai SW, Chien HH, Chen TY, Sheu SY, So EC, Huang BM. Cordycepin Inhibits Human Gestational Choriocarcinoma Cell Growth by Disrupting Centrosome Homeostasis. DRUG DESIGN DEVELOPMENT AND THERAPY 2020; 14:2987-3000. [PMID: 32801639 PMCID: PMC7394508 DOI: 10.2147/dddt.s252401] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 07/06/2020] [Indexed: 12/19/2022]
Abstract
Introduction Human gestational choriocarcinoma, a type of gestational trophoblastic disease, occurs after miscarriage, abortion, ectopic pregnancy, or molar pregnancy. Despite recent advances in the mechanism of anticancer drugs that induce human gestational choriocarcinoma apoptosis or block its growth, new therapeutic approaches are needed to be established. Cordycepin is an active anti-cancer component extracted from Cordyceps sinensis. It prevents cell proliferation both in vitro and in vivo. Materials and Methods Here, we examined cell growth by counting cell numbers, and performing a flow cytometry assay and EdU incorporation assay. Centrosome and cytoskeleton-related structures were observed by immunofluorescence assay. The DNA damage-related signaling was examined by Western blot assay. Results Here, we showed that cordycepin inhibited human gestational choriocarcinoma cell proliferation and induced cell death. In addition, treatment with cordycepin activated DNA-PK and ERK, thus inducing centrosome amplification and aberrant mitosis. These amplified centrosomes also disrupted microtubule arrays and actin networks, thus leading to defective cell adhesion. Furthermore, cordycepin induced autophagy for triggering cell death. Conclusion Thus, our study demonstrates that cordycepin inhibits cell proliferation and disrupts the cytoskeleton by triggering centrosome amplification.
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Affiliation(s)
- Chia-Yih Wang
- Department of Cell Biology and Anatomy, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Shih-Wei Tsai
- Department of Obstetrics and Gynecology, An Nan Hospital, China Medical University, Tainan, Taiwan
| | - Han-Hsiang Chien
- Department of Cell Biology and Anatomy, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Ting-Yu Chen
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Shi-Yuan Sheu
- School of Chinese Medicine for Post-Baccalaureate, I-Shou University, Kaohsiung, Taiwan.,Department of Chinese Medicine, E-Da Cancer Hospital, Kaohsiung, Taiwan
| | - Edmund Cheung So
- Department of Anesthesia & Medical Research, An Nan Hospital, China Medical University, Tainan, Taiwan.,Graduate Institute of Medical Sciences, Chang Jung Christian University Tainan, Tainan, Taiwan
| | - Bu-Miin Huang
- Department of Cell Biology and Anatomy, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Institute of Medical Research, China Medical University, Taichung, Taiwan
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32
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Lücking U, Wortmann L, Wengner AM, Lefranc J, Lienau P, Briem H, Siemeister G, Bömer U, Denner K, Schäfer M, Koppitz M, Eis K, Bartels F, Bader B, Bone W, Moosmayer D, Holton SJ, Eberspächer U, Grudzinska-Goebel J, Schatz C, Deeg G, Mumberg D, von Nussbaum F. Damage Incorporated: Discovery of the Potent, Highly Selective, Orally Available ATR Inhibitor BAY 1895344 with Favorable Pharmacokinetic Properties and Promising Efficacy in Monotherapy and in Combination Treatments in Preclinical Tumor Models. J Med Chem 2020; 63:7293-7325. [PMID: 32502336 DOI: 10.1021/acs.jmedchem.0c00369] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The ATR kinase plays a key role in the DNA damage response by activating essential signaling pathways of DNA damage repair, especially in response to replication stress. Because DNA damage and replication stress are major sources of genomic instability, selective ATR inhibition has been recognized as a promising new approach in cancer therapy. We now report the identification and preclinical evaluation of the novel, clinical ATR inhibitor BAY 1895344. Starting from quinoline 2 with weak ATR inhibitory activity, lead optimization efforts focusing on potency, selectivity, and oral bioavailability led to the discovery of the potent, highly selective, orally available ATR inhibitor BAY 1895344, which exhibited strong monotherapy efficacy in cancer xenograft models that carry certain DNA damage repair deficiencies. Moreover, combination treatment of BAY 1895344 with certain DNA damage inducing chemotherapy resulted in synergistic antitumor activity. BAY 1895344 is currently under clinical investigation in patients with advanced solid tumors and lymphomas (NCT03188965).
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Affiliation(s)
- Ulrich Lücking
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Lars Wortmann
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Antje M Wengner
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Julien Lefranc
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Philip Lienau
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Hans Briem
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Gerhard Siemeister
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Ulf Bömer
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Karsten Denner
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Martina Schäfer
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Marcus Koppitz
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Knut Eis
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Florian Bartels
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Benjamin Bader
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Wilhelm Bone
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Dieter Moosmayer
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Simon J Holton
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Uwe Eberspächer
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | | | - Christoph Schatz
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Gesa Deeg
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Dominik Mumberg
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
| | - Franz von Nussbaum
- Research & Development, Pharmaceuticals, Bayer AG, 13353 Berlin, Germany
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33
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Ren S, Ur Rehman Z, Gao B, Yang Z, Zhou J, Meng C, Song C, Nair V, Sun Y, Ding C. ATM-mediated DNA double-strand break response facilitated oncolytic Newcastle disease virus replication and promoted syncytium formation in tumor cells. PLoS Pathog 2020; 16:e1008514. [PMID: 32479542 PMCID: PMC7263568 DOI: 10.1371/journal.ppat.1008514] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Accepted: 04/03/2020] [Indexed: 12/25/2022] Open
Abstract
Deoxyribonucleic acid (DNA) damage response (DDR) is the fundamental cellular response for maintaining genomic integrity and suppressing tumorigenesis. The activation of ataxia telangiectasia-mutated (ATM) kinase is central to DNA double-strand break (DSB) for maintaining host-genome integrity in mammalian cells. Oncolytic Newcastle disease virus (NDV) can selectively replicate in tumor cells; however, its influence on the genome integrity of tumor cells is not well-elucidated. Here, we found that membrane fusion and NDV infection triggered DSBs in tumor cells. The late replication and membrane fusion of NDV mechanistically activated the ATM-mediated DSB pathway via the ATM-Chk2 axis, as evidenced by the hallmarks of DSBs, i.e., auto-phosphorylated ATM and phosphorylated H2AX and Chk2. Immunofluorescence data showed that multifaceted ATM-controlled phosphorylation markedly induced the formation of pan-nuclear punctum foci in response to NDV infection and F-HN co-expression. Specific drug-inhibitory experiments on ATM kinase activity further suggested that ATM-mediated DSBs facilitated NDV replication and membrane fusion. We confirmed that the Mre11-RAD50-NBS1 (MRN) complex sensed the DSB signal activation triggered by NDV infection and membrane fusion. The pharmacological inhibition of MRN activity also significantly inhibited intracellular and extracellular NDV replication and syncytia formation. Collectively, these data identified for the first time a direct link between the membrane fusion induced by virus infection and DDR pathways, thereby providing new insights into the efficient replication of oncolytic NDV in tumor cells.
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Affiliation(s)
- Shanhui Ren
- Department of Avian Infectious Diseases, Shanghai Veterinary Research Institute. Chinese Academy of Agricultural Science, Shanghai, P.R. China
| | - Zaib Ur Rehman
- Department of Avian Infectious Diseases, Shanghai Veterinary Research Institute. Chinese Academy of Agricultural Science, Shanghai, P.R. China
| | - Bo Gao
- Department of Avian Infectious Diseases, Shanghai Veterinary Research Institute. Chinese Academy of Agricultural Science, Shanghai, P.R. China
| | - Zengqi Yang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, P.R. China
| | - Jiyong Zhou
- Key Laboratory of Animal Virology of Ministry of Agriculture, Department of Veterinary Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Chunchun Meng
- Department of Avian Infectious Diseases, Shanghai Veterinary Research Institute. Chinese Academy of Agricultural Science, Shanghai, P.R. China
| | - Cuiping Song
- Department of Avian Infectious Diseases, Shanghai Veterinary Research Institute. Chinese Academy of Agricultural Science, Shanghai, P.R. China
| | - Venugopal Nair
- Avian Oncogenic viruses group, UK-China Centre of Excellence on Avian Disease Research, The Pirbright Institute, Pirbright, Guildford, Surrey, United Kingdom
| | - Yingjie Sun
- Department of Avian Infectious Diseases, Shanghai Veterinary Research Institute. Chinese Academy of Agricultural Science, Shanghai, P.R. China
| | - Chan Ding
- Department of Avian Infectious Diseases, Shanghai Veterinary Research Institute. Chinese Academy of Agricultural Science, Shanghai, P.R. China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou University, Yangzhou, Jiangsu, P.R. China
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Gan H, Qi M, Chan C, Leung P, Ye G, Lei Y, Liu A, Xue F, Liu D, Ye W, Zhang D, Deng L, Chen J. Digitoxin inhibits HeLa cell growth through the induction of G2/M cell cycle arrest and apoptosis in vitro and in vivo. Int J Oncol 2020; 57:562-573. [PMID: 32468057 DOI: 10.3892/ijo.2020.5070] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Accepted: 05/12/2020] [Indexed: 11/05/2022] Open
Abstract
Cervical cancer is the fourth most common gynecological malignancy affecting the health of women worldwide and the second most common cause of cancer‑related mortality among women in developing regions. Thus, the development of effective chemotherapeutic drugs for the treatment of cervical cancer has become an important issue in the medical field. The application of natural products for the prevention and treatment of various diseases, particularly cancer, has always attracted widespread attention. In the present study, a library of natural products composed of 78 single compounds was screened and it was found that digitoxin exhibited the highest cytotoxicity against HeLa cervical cancer cells with an IC50 value of 28 nM at 48 h. Furthermore, digitoxin exhibited extensive antitumor activities in a variety of malignant cell lines, including the lung cancer cell line, A549, the hepatoma cell line, MHCC97H, and the colon cancer cell line, HCT116. Mechanistically, digitoxin caused DNA double‑stranded breaks (DSBs), inhibited the cell cycle at the G2/M phase via the ataxia telangiectasia mutated serine/threonine kinase (ATM)/ATM and Rad3‑related serine/threonine kinase (ATR)‑checkpoint kinase (CHK1)/checkpoint kinase 2 (CHK2)‑Cdc25C pathway and ultimately triggered mitochondrial apoptosis, which was characterized by the disruption of Bax/Bcl‑2, the release of cytochrome c and the sequential activation of caspases and poly(ADP‑ribose) polymerase (PARP). In addition, the in vivo anticancer effect of digitoxin was confirmed in HeLa cell xenotransplantation models. On the whole, the findings of the present study demonstrate the efficacy of digitoxin against cervical cancer in vivo and elucidate its molecular mechanisms, including DSBs, cell cycle arrest and mitochondrial apoptosis. These results will contribute to the development of digitoxin as a chemotherapeutic agent in the treatment of cervical cancer.
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Affiliation(s)
- Hua Gan
- Formula‑pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Ming Qi
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of Traditional Chinese Medicine and New Drugs Research, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Chakpiu Chan
- Formula‑pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Pan Leung
- Formula‑pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Geni Ye
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of Traditional Chinese Medicine and New Drugs Research, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Yuhe Lei
- Department of Pharmacy, Shenzhen Hospital of Guangzhou University of Chinese Medicine, Shenzhen, Guangdong 518034, P.R. China
| | - Aiai Liu
- Formula‑pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Feifei Xue
- Formula‑pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Dongdong Liu
- Formula‑pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Wencai Ye
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of Traditional Chinese Medicine and New Drugs Research, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Dongmei Zhang
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of Traditional Chinese Medicine and New Drugs Research, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Lijuan Deng
- Formula‑pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Jiaxu Chen
- Formula‑pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
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Villoria MT, Gutiérrez-Escribano P, Alonso-Rodríguez E, Ramos F, Merino E, Campos A, Montoya A, Kramer H, Aragón L, Clemente-Blanco A. PP4 phosphatase cooperates in recombinational DNA repair by enhancing double-strand break end resection. Nucleic Acids Res 2020; 47:10706-10727. [PMID: 31544936 PMCID: PMC6846210 DOI: 10.1093/nar/gkz794] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 08/30/2019] [Accepted: 09/11/2019] [Indexed: 12/30/2022] Open
Abstract
The role of Rad53 in response to a DNA lesion is central for the accurate orchestration of the DNA damage response. Rad53 activation relies on its phosphorylation by Mec1 and its own autophosphorylation in a manner dependent on the adaptor Rad9. While the mechanism behind Rad53 activation has been well documented, less is known about the processes that counteract its activity along the repair of a DNA adduct. Here, we describe that PP4 phosphatase is required to avoid Rad53 hyper-phosphorylation during the repair of a double-strand break, a process that impacts on the phosphorylation status of multiple factors involved in the DNA damage response. PP4-dependent Rad53 dephosphorylation stimulates DNA end resection by relieving the negative effect that Rad9 exerts over the Sgs1/Dna2 exonuclease complex. Consequently, elimination of PP4 activity affects resection and repair by single-strand annealing, defects that are bypassed by reducing Rad53 hyperphosphorylation. These results confirm that Rad53 phosphorylation is controlled by PP4 during the repair of a DNA lesion and demonstrate that the attenuation of its kinase activity during the initial steps of the repair process is essential to efficiently enhance recombinational DNA repair pathways that depend on long-range resection for their success.
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Affiliation(s)
- María Teresa Villoria
- Cell Cycle and Genome Stability Group, Institute of Functional Biology and Genomics (IBFG), Spanish National Research Council (CSIC). University of Salamanca (USAL), C/ Zacarías González 2, Salamanca 37007, Spain
| | - Pilar Gutiérrez-Escribano
- Cell Cycle Group. Medical Research Council, London Institute of Medical Science, Du Cane Road, London W12 0NN, UK
| | - Esmeralda Alonso-Rodríguez
- Cell Cycle and Genome Stability Group, Institute of Functional Biology and Genomics (IBFG), Spanish National Research Council (CSIC). University of Salamanca (USAL), C/ Zacarías González 2, Salamanca 37007, Spain
| | - Facundo Ramos
- Cell Cycle and Genome Stability Group, Institute of Functional Biology and Genomics (IBFG), Spanish National Research Council (CSIC). University of Salamanca (USAL), C/ Zacarías González 2, Salamanca 37007, Spain
| | - Eva Merino
- Cell Cycle and Genome Stability Group, Institute of Functional Biology and Genomics (IBFG), Spanish National Research Council (CSIC). University of Salamanca (USAL), C/ Zacarías González 2, Salamanca 37007, Spain
| | - Adrián Campos
- Cell Cycle and Genome Stability Group, Institute of Functional Biology and Genomics (IBFG), Spanish National Research Council (CSIC). University of Salamanca (USAL), C/ Zacarías González 2, Salamanca 37007, Spain
| | - Alex Montoya
- Biological Mass Spectrometry and Proteomics Laboratory, Medical Research Council, London Institute of Medical Science, Du Cane Road, London W12 0NN, UK
| | - Holger Kramer
- Biological Mass Spectrometry and Proteomics Laboratory, Medical Research Council, London Institute of Medical Science, Du Cane Road, London W12 0NN, UK
| | - Luis Aragón
- Cell Cycle Group. Medical Research Council, London Institute of Medical Science, Du Cane Road, London W12 0NN, UK
| | - Andrés Clemente-Blanco
- Cell Cycle and Genome Stability Group, Institute of Functional Biology and Genomics (IBFG), Spanish National Research Council (CSIC). University of Salamanca (USAL), C/ Zacarías González 2, Salamanca 37007, Spain
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Cell Cycle and DNA Repair Regulation in the Damage Response: Protein Phosphatases Take Over the Reins. Int J Mol Sci 2020; 21:ijms21020446. [PMID: 31936707 PMCID: PMC7014277 DOI: 10.3390/ijms21020446] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 12/29/2019] [Accepted: 01/02/2020] [Indexed: 12/14/2022] Open
Abstract
Cells are constantly suffering genotoxic stresses that affect the integrity of our genetic material. Genotoxic insults must be repaired to avoid the loss or inappropriate transmission of the genetic information, a situation that could lead to the appearance of developmental abnormalities and tumorigenesis. To combat this threat, eukaryotic cells have evolved a set of sophisticated molecular mechanisms that are collectively known as the DNA damage response (DDR). This surveillance system controls several aspects of the cellular response, including the detection of lesions, a temporary cell cycle arrest, and the repair of the broken DNA. While the regulation of the DDR by numerous kinases has been well documented over the last decade, the complex roles of protein dephosphorylation have only recently begun to be investigated. Here, we review recent progress in the characterization of DDR-related protein phosphatases during the response to a DNA lesion, focusing mainly on their ability to modulate the DNA damage checkpoint and the repair of the damaged DNA. We also discuss their protein composition and structure, target specificity, and biochemical regulation along the different stages encompassed in the DDR. The compilation of this information will allow us to better comprehend the physiological significance of protein dephosphorylation in the maintenance of genome integrity and cell viability in response to genotoxic stress.
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van Stuijvenberg J, Proksch P, Fritz G. Targeting the DNA damage response (DDR) by natural compounds. Bioorg Med Chem 2020; 28:115279. [PMID: 31980363 DOI: 10.1016/j.bmc.2019.115279] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 12/09/2019] [Accepted: 12/15/2019] [Indexed: 12/31/2022]
Abstract
Natural compounds (NC) are an important source of anticancer drugs. The genomic DNA of tumor cells is a major target of conventional anticancer therapeutics (cAT). DNA damage elicits a complex stress response programme termed DNA damage response (DDR), with the PI3-like kinase ATM and ATR being the key regulators. Since the DDR coordinates mechanisms of DNA repair and apoptosis, hence regulating the balance between death and survival, it is an attractive target of novel anticancer strategies. The aim of the study was to identify natural compounds derived from endophytic fungi, lichens, marine sponges or plants that interfere with mechanisms of the DDR. To this end, the cytotoxic and DDR modulating potency of 296 natural compounds, used alone or in combination with the cAT cisplatin (Cis) and doxorubicin (Doxo) was investigated by fluorescence-based analysis of the ATM/ATR-catalyzed S139 phosphorylation of histone 2AX (γH2AX), a surrogate marker of DNA damage-triggered DDR. After initial screening, a total of ten natural compounds were identified that were toxic in pancreatic carcinoma cells and activated the DDR on their own and/or promoted the DDR if used in combination with cAT. Their mode of action was shown to be independent of drug transport mechanisms. Based on their chemical structures, DDR modulatory activity and published data we suggest the marine NC 5-epi-nakijiquinone Q and 5-epi-ilimaquinone as well as the fungal compound secalonic acid F as most promising NC-based drug candidates for future synthesis of DDR-modulating chemical derivatives and their preclinical in vitro and in vivo testing.
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Affiliation(s)
- Jana van Stuijvenberg
- Institute of Toxicology, Medical Faculty, Heinrich-Heine University Düsseldorf, Moorenstrasse 5, 40225 Düsseldorf, Germany
| | - Peter Proksch
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich-Heine University Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany
| | - Gerhard Fritz
- Institute of Toxicology, Medical Faculty, Heinrich-Heine University Düsseldorf, Moorenstrasse 5, 40225 Düsseldorf, Germany.
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Kang T, Ge M, Wang R, Tan Z, Zhang X, Zhu C, Liu H, Chen S. Arsenic sulfide induces RAG1-dependent DNA damage for cell killing by inhibiting NFATc3 in gastric cancer cells. J Exp Clin Cancer Res 2019; 38:487. [PMID: 31822296 PMCID: PMC6902349 DOI: 10.1186/s13046-019-1471-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 11/04/2019] [Indexed: 12/26/2022] Open
Abstract
Background Arsenic sulfide was found to have potential anti-cancer activities, especially in gastric cancer. However, the underlying mechanism need to be further explored. This study was aimed to investigate the mechanism of arsenic compounds on gastric cancer. Methods Gastric cancer cell lines were infected with lentiviral vector carrying shNFATc3 and/or treated with arsenic sulfide. MTT assay were performed to assess cell growth. Flow cytometer assays were used to detect cell cycle and reactive oxygen species (ROS) level of gastric cancer cells. Western blot was carried out to detect nuclear factor of activated T-cells, cytoplasmic 3 (NFATc3), cell cycle markers, DNA damage pathway protein expression as well as other protein expression in gastric cancer cell lines. The expression of recombination activating gene 1 (RAG1) in gastric cancer cell lines was determined by RNA-sequencing analyses and Real-Time qPCR. The effect of NFATc3 on RAG1 were determined by CHIP-qPCR assay. The effect of arsenic sulfide on AGS cells was evaluated in vivo. Results We show that arsenic sulfide as well as knockdown of NFATc3 resulted in increased double-strand DNA damage in gastric cancer cells by increasing the expression of RAG1, an endonuclease essential for immunoglobulin V(D) J recombination. Overexpression of NFATc3 blocked the expression of RAG1 expression and DNA damage induced by arsenic sulfide. Arsenic sulfide induced cellular oxidative stress to redistribute NFATc3, thereby inhibiting its transcriptional function, which can be reversed by N-acetyl-L-cysteine (NAC). We show that NFATc3 targets the promoter of RAG1 for transcriptional inhibition. We further showed that NFATc3 upregulation and RAG1 downregulation significantly associated with poor prognosis in patients with gastric cancer. Our in vivo experiments further confirmed that arsenic sulfide exerted cytotoxic activity against gastric cancer cells through inhibiting NFATc3 to activate RAG1 pathway. Conclusion These results demonstrate that arsenic sulfide targets NFATc3 to induce double strand DNA break (DSB) for cell killing through activating RAG1 expression. Our results link arsenic compound to the regulation of DNA damage control and RAG1 expression as a mechanism for its cytotoxic effect.
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Paul S, Patra D, Kundu R. Lignan enriched fraction (LRF) of Phyllanthus amarus promotes apoptotic cell death in human cervical cancer cells in vitro. Sci Rep 2019; 9:14950. [PMID: 31628385 PMCID: PMC6802087 DOI: 10.1038/s41598-019-51480-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Accepted: 09/27/2019] [Indexed: 12/17/2022] Open
Abstract
Phyllanthus amarus is widely grown in this sub-continent and used traditionally to treat many common ailments. In the present study, lignan rich fraction of P. amarus extract was used on cervical cancer cell lines (HeLa, SiHa and C33A) to study it’s mechanism of cell death induction. As the cells were treated with IC50 doses of LRF, characteristic apoptotic features were observed. Increased sub G0 population were observed both in Hela and C33 cells, while G1/S arrest was observed in SiHa cells than their untreated counterparts. Increased production of ROS and change in MMP were also detected in the treated cells. Presence of γH2AX, was observed by immunofluorescence. Reduced expression of HPV (16/18) as well as ET-1, an autocrine growth substance, were observed in the treated cells. Immunoblotting as well as ICFC studies showed enhanced expressions of BAX, Caspase 3 and PARP (cleaved) in the treated cells. A major lignan, phyllanthin was isolated from the chloroform fraction and showed strong irreversible affinities for viral E6 and MDM2 in in silico analysis. The study conclusively indicates that LRF has the potential to induce apoptotic cell death in cervical cancer cells by activation of p53 and p21 against DNA damage.
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Affiliation(s)
- Subhabrata Paul
- Bioprospecting Laboratory, School of Biotechnology, Department of Life Sciences, Presidency University, Kolkata, India
| | - Debashis Patra
- Chemistry Laboratory, Department of Science & Humanities, Acharya Jagadish Chandra Bose Polytechnic, Berachampa, West Bengal, India
| | - Rita Kundu
- Cell Biology Laboratory, Department of Botany, Centre of Advanced Studies, University of Calcutta, Kolkata, India.
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Wengner AM, Siemeister G, Lücking U, Lefranc J, Wortmann L, Lienau P, Bader B, Bömer U, Moosmayer D, Eberspächer U, Golfier S, Schatz CA, Baumgart SJ, Haendler B, Lejeune P, Schlicker A, von Nussbaum F, Brands M, Ziegelbauer K, Mumberg D. The Novel ATR Inhibitor BAY 1895344 Is Efficacious as Monotherapy and Combined with DNA Damage-Inducing or Repair-Compromising Therapies in Preclinical Cancer Models. Mol Cancer Ther 2019; 19:26-38. [PMID: 31582533 DOI: 10.1158/1535-7163.mct-19-0019] [Citation(s) in RCA: 111] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 07/05/2019] [Accepted: 09/27/2019] [Indexed: 11/16/2022]
Abstract
The DNA damage response (DDR) secures the integrity of the genome of eukaryotic cells. DDR deficiencies can promote tumorigenesis but concurrently may increase dependence on alternative repair pathways. The ataxia telangiectasia and Rad3-related (ATR) kinase plays a central role in the DDR by activating essential signaling pathways of DNA damage repair. Here, we studied the effect of the novel selective ATR kinase inhibitor BAY 1895344 on tumor cell growth and viability. Potent antiproliferative activity was demonstrated in a broad spectrum of human tumor cell lines. BAY 1895344 exhibited strong monotherapy efficacy in cancer xenograft models that carry DNA damage repair deficiencies. The combination of BAY 1895344 with DNA damage-inducing chemotherapy or external beam radiotherapy (EBRT) showed synergistic antitumor activity. Combination treatment with BAY 1895344 and DDR inhibitors achieved strong synergistic antiproliferative activity in vitro, and combined inhibition of ATR and PARP signaling using olaparib demonstrated synergistic antitumor activity in vivo Furthermore, the combination of BAY 1895344 with the novel, nonsteroidal androgen receptor antagonist darolutamide resulted in significantly improved antitumor efficacy compared with respective single-agent treatments in hormone-dependent prostate cancer, and addition of EBRT resulted in even further enhanced antitumor efficacy. Thus, the ATR inhibitor BAY 1895344 may provide new therapeutic options for the treatment of cancers with certain DDR deficiencies in monotherapy and in combination with DNA damage-inducing or DNA repair-compromising cancer therapies by improving their efficacy.
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Affiliation(s)
- Antje M Wengner
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany.
| | | | - Ulrich Lücking
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Julien Lefranc
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Lars Wortmann
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Philip Lienau
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Benjamin Bader
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Ulf Bömer
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Dieter Moosmayer
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Uwe Eberspächer
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Sven Golfier
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | | | - Simon J Baumgart
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Bernard Haendler
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Pascale Lejeune
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Andreas Schlicker
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | | | - Michael Brands
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Karl Ziegelbauer
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
| | - Dominik Mumberg
- Bayer AG, Pharmaceuticals, Research and Development, Berlin, Germany
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Han Y, Jin F, Xie Y, Liu Y, Hu S, Liu XD, Guan H, Gu Y, Ma T, Zhou PK. DNA‑PKcs PARylation regulates DNA‑PK kinase activity in the DNA damage response. Mol Med Rep 2019; 20:3609-3616. [PMID: 31485633 PMCID: PMC6755157 DOI: 10.3892/mmr.2019.10640] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 07/05/2019] [Indexed: 11/29/2022] Open
Abstract
DNA-dependent protein kinase catalytic subunit (-PKcs) is the core protein involved in the non-homologous end-joining repair of double-strand breaks. In addition, it can form a complex with poly(ADP-ribose) polymerase 1 (PARP1), which catalyzes protein PARylation. However, it is unclear how DNA-PKcs interacts with PARP1 in the DNA damage response and how PARylation affects DNA-PK kinase activity. Using immunoprecipitation, immunofluorescence and flow cytometry the present study found that DNA-PKcs was PARylated after DNA damage, and the PARP1/2 inhibitor olaparib completely abolished DNA-PKcs PARylation. Olaparib treatment prevented DNA-PKcs protein detachment from chromatin after DNA damage and maintained DNA-PK activation, as evidenced by DNA-PKcs Ser2056 phosphorylation. Furthermore, olaparib treatment synergized with DNA-PK inhibition to suppress cell survival. All of the above results are suggestive of the important role of DNA-PKcs PARylation in regulating DNA-PK activity.
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Affiliation(s)
- Yang Han
- Institute for Environmental Medicine and Radiation Hygiene, School of Public Health, University of South China, Hengyang, Hunan 421001, P.R. China
| | - Feng Jin
- Department of Radiation Biology, Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, Beijing 100850, P.R. China
| | - Ying Xie
- Department of Radiation Biology, Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, Beijing 100850, P.R. China
| | - Yike Liu
- Department of Radiation Biology, Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, Beijing 100850, P.R. China
| | - Sai Hu
- Institute for Environmental Medicine and Radiation Hygiene, School of Public Health, University of South China, Hengyang, Hunan 421001, P.R. China
| | - Xiao-Dan Liu
- Department of Radiation Biology, Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, Beijing 100850, P.R. China
| | - Hua Guan
- Department of Radiation Biology, Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, Beijing 100850, P.R. China
| | - Yongqing Gu
- Department of Radiation Biology, Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, Beijing 100850, P.R. China
| | - Teng Ma
- Department of Radiation Biology, Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, Beijing 100850, P.R. China
| | - Ping-Kun Zhou
- Department of Radiation Biology, Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, Beijing 100850, P.R. China
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43
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Amirifar P, Ranjouri MR, Yazdani R, Abolhassani H, Aghamohammadi A. Ataxia-telangiectasia: A review of clinical features and molecular pathology. Pediatr Allergy Immunol 2019; 30:277-288. [PMID: 30685876 DOI: 10.1111/pai.13020] [Citation(s) in RCA: 98] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2018] [Revised: 12/29/2018] [Accepted: 12/30/2018] [Indexed: 01/09/2023]
Abstract
Ataxia-telangiectasia (A-T) is an autosomal recessive primary immunodeficiency (PID) disease that is caused by mutations in ataxia-telangiectasia mutated (ATM) gene encoding a serine/threonine protein kinase. A-T patients represent a broad range of clinical manifestations including progressive cerebellar ataxia, oculocutaneous telangiectasia, variable immunodeficiency, radiosensitivity, susceptibility to malignancies, and increased metabolic diseases. This congenital disorder has phenotypic heterogeneity, and the severity of symptoms varies in different patients based on severity of mutations and disease progression. The principal role of nuclear ATM is the coordination of cellular signaling pathways in response to DNA double-strand breaks, oxidative stress, and cell cycle checkpoint. The pathogenesis of A-T is not limited to the role of ATM in the DNA damage response (DDR) pathway, and it has other functions mainly in the hematopoietic cells and neurons. ATM adjusts the functions of organelles such as mitochondria and peroxisomes and also regulates angiogenesis and glucose metabolisms. However, ATM has other functions in the cells (especially cell viability) that need further investigations. In this review, we described functions of ATM in the nucleus and cytoplasm, and also its association with some disorder formation such as neurologic, immunologic, vascular, pulmonary, metabolic, and dermatologic complications.
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Affiliation(s)
- Parisa Amirifar
- Medical Genetics Department, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Reza Ranjouri
- Molecular Medicine and Genetics Department, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Reza Yazdani
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran, Iran
- University of Medical Science, Tehran, Iran
| | - Hassan Abolhassani
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran, Iran
- University of Medical Science, Tehran, Iran
- Division of Clinical Immunology, Department of Laboratory Medicine, Karolinska Institute at Karolinska University Hospital Huddinge, Stockholm, Sweden
| | - Asghar Aghamohammadi
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran, Iran
- University of Medical Science, Tehran, Iran
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Ha GH, Ji JH, Chae S, Park J, Kim S, Lee JK, Kim Y, Min S, Park JM, Kang TH, Lee H, Cho H, Lee CW. Pellino1 regulates reversible ATM activation via NBS1 ubiquitination at DNA double-strand breaks. Nat Commun 2019; 10:1577. [PMID: 30952868 PMCID: PMC6450972 DOI: 10.1038/s41467-019-09641-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 03/20/2019] [Indexed: 01/10/2023] Open
Abstract
DNA double-strand break (DSB) signaling and repair are critical for genome integrity. They rely on highly coordinated processes including posttranslational modifications of proteins. Here we show that Pellino1 (Peli1) is a DSB-responsive ubiquitin ligase required for the accumulation of DNA damage response proteins and efficient homologous recombination (HR) repair. Peli1 is activated by ATM-mediated phosphorylation. It is recruited to DSB sites in ATM- and γH2AX-dependent manners. Interaction of Peli1 with phosphorylated histone H2AX enables it to bind to and mediate the formation of K63-linked ubiquitination of NBS1, which subsequently results in feedback activation of ATM and promotes HR repair. Collectively, these results provide a DSB-responsive factor underlying the connection between ATM kinase and DSB-induced ubiquitination. Occurrence of DNA double-strand break (DSB) repair is important for genome integrity. Here, the authors reveal that Pellino1 is a DSB-responsive ubiquitin ligase required for promoting the accumulation of ATM and MRN complex at DSB sites via NBS1 ubiquitination.
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Affiliation(s)
- Geun-Hyoung Ha
- Department of Molecular Cell Biology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon, 16419, Republic of Korea
| | - Jae-Hoon Ji
- Genomic Instability Research Center, Ajou University School of Medicine, Suwon, 16499, Republic of Korea.
| | - Sunyoung Chae
- Institute of Medical Science, Ajou University School of Medicine, Suwon, 16499, Republic of Korea
| | - Jihyun Park
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, 06351, Republic of Korea
| | - Suhyeon Kim
- Department of Molecular Cell Biology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon, 16419, Republic of Korea
| | - Jin-Kwan Lee
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, 06351, Republic of Korea
| | - Yonghyeon Kim
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, 16499, Republic of Korea
| | - Sunwoo Min
- Genomic Instability Research Center, Ajou University School of Medicine, Suwon, 16499, Republic of Korea.,Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, 16499, Republic of Korea
| | - Jeong-Min Park
- Department of Biological Science, Dong-A University, Pusan, 49201, Republic of Korea
| | - Tae-Hong Kang
- Department of Biological Science, Dong-A University, Pusan, 49201, Republic of Korea
| | - Ho Lee
- Graduate School of Cancer Science and Policy, Research Institute, National Cancer Center, Goyang, 10408, Republic of Korea
| | - Hyeseong Cho
- Genomic Instability Research Center, Ajou University School of Medicine, Suwon, 16499, Republic of Korea. .,Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, 16499, Republic of Korea.
| | - Chang-Woo Lee
- Department of Molecular Cell Biology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon, 16419, Republic of Korea. .,Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, 06351, Republic of Korea.
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45
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Transition from a meiotic to a somatic-like DNA damage response during the pachytene stage in mouse meiosis. PLoS Genet 2019; 15:e1007439. [PMID: 30668564 PMCID: PMC6358097 DOI: 10.1371/journal.pgen.1007439] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 02/01/2019] [Accepted: 11/28/2018] [Indexed: 11/24/2022] Open
Abstract
Homologous recombination (HR) is the principal mechanism of DNA repair acting during meiosis and is fundamental for the segregation of chromosomes and the increase of genetic diversity. Nevertheless, non-homologous end joining (NHEJ) mechanisms can also act during meiosis, mainly in response to exogenously-induced DNA damage in late stages of first meiotic prophase. In order to better understand the relationship between these two repair pathways, we studied the response to DNA damage during male mouse meiosis after gamma radiation. We clearly discerned two types of responses immediately after treatment. From leptotene to early pachytene, exogenous damage triggered the massive presence of γH2AX throughout the nucleus, which was associated with DNA repair mediated by HR components (DMC1 and RAD51). This early pathway finished with the sequential removal of DMC1 and RAD51 and was no longer inducible at mid pachytene. However, from mid-pachytene to diplotene, γH2AX appeared as large discrete foci. This late repair pattern was mediated initially by NHEJ, involving Ku70 and XRCC4, which were constitutively present, and 53BP1, which appeared at sites of damage soon after irradiation. Nevertheless, 24 hours after irradiation, a HR pathway involving RAD51 but not DMC1 mostly replaced NHEJ. Additionally, we observed the occurrence of synaptonemal complex bridges between bivalents, most likely representing chromosome translocation events that may involve DMC1, RAD51 or 53BP1. Our results reinforce the idea that the early “meiotic” repair pathway that acts by default at the beginning of meiosis is replaced from mid-pachytene onwards by a “somatic-like” repair pattern. This shift might be important to resolve DNA damage (either endogenous or exogenous) that could not be repaired by the early meiotic mechanisms, for instance those in the sex chromosomes, which lack a homologous chromosome to repair with. This transition represents another layer of functional changes that occur in meiotic cells during mid pachytene, in addition to epigenetic reprograming, reactivation of transcription, changes in the gene expression profile and acquisition of competence to proceed to metaphase. DNA repair is critical for both somatic and meiotic cells. During meiosis, hundreds of DNA double strand breaks (DSBs) are introduced endogenously. To repair this damage, meiotic cells use a specialized version of the homologous recombination (HR) pathway that uses specific meiotic recombinases, such as DMC1, to promote repair with the homologous chromosome instead of the sister chromatid. This process is important to ensure chromosome segregation during meiosis and, as a side consequence, increases the genetic diversity of offspring. Nevertheless, under specific circumstances, meiotic cells can use other DNA repair mechanisms such as non-homologous end joining (NHEJ), which is error-prone. We investigated the response of mouse spermatocytes to increased DNA damage caused by gamma radiation, which is commonly used in cancer therapy. We found that the excess of DSBs produced by irradiation is processed by the meiotic HR recombination pathway in spermatocytes at the early stages of first meiotic prophase. However, this response is not inducible from the mid-pachytene stage onwards. From this point on, spermatocytes rely on a response that shares many features with that of somatic cells. In this response, the NHEJ pathway is first used to repair DNA damage but is subsequently replaced by a HR mechanism that does not use DMC1. Instead, it relies only on RAD51, which is known to function in both somatic and meiosis cells and, contrary to DMC1, has a preference for the sister chromatid. This switch from a meiotic to a somatic-like response is accompanied by a conspicuous change in the epigenetic response to DNA damage, reinforcing the idea that a functional transition occurs in meiotic cells during the mid-pachytene stage.
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Chen J, Shen X, Pardue S, Meram AT, Rajendran S, Ghali GE, Kevil CG, Shackelford RE. The Ataxia telangiectasia-mutated and Rad3-related protein kinase regulates cellular hydrogen sulfide concentrations. DNA Repair (Amst) 2018; 73:55-63. [PMID: 30470507 DOI: 10.1016/j.dnarep.2018.11.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 11/07/2018] [Accepted: 11/08/2018] [Indexed: 12/16/2022]
Abstract
The ataxia telangiectasia-mutated and Rad3-related (ATR) serine/threonine kinase plays a central role in the repair of replication-associated DNA damage, the maintenance of S and G2/M-phase genomic stability, and the promotion of faithful mitotic chromosomal segregation. A number of stimuli activate ATR, including persistent single-stranded DNA at stalled replication folks, R loop formation, hypoxia, ultraviolet light, and oxidative stress, leading to ATR-mediated protein phosphorylation. Recently, hydrogen sulfide (H2S), an endogenous gasotransmitter, has been found to regulate multiple cellular processes through complex redox reactions under similar cell stress environments. Three enzymes synthesize H2S: cystathionine-β-synthase, cystathionine γ-lyase, and 3-mercaptopyruvate sulfurtransferase. Since H2S can under some conditions cause DNA damage, we hypothesized that ATR activity may regulate cellular H2S concentrations and H2S-syntheszing enzymes. Here we show that human colorectal cancer cells carrying biallelic knock-in hypomorphic ATR mutations have lower cellular H2S concentrations than do syngeneic ATR wild-type cells, and all three H2S-synthesizing enzymes show lower protein expression in the ATR hypomorphic mutant cells. Additionally, ATR serine 428 phosphorylation is altered by H2S donor and H2S synthesis enzyme inhibition, while the oxidative-stress induced phosphorylation of the ATR-regulated protein CHK1 on serine 345 is increased by H2S synthesis enzyme inhibition. Lastly, inhibition of H2S production potentiated oxidative stress-induced double-stranded DNA breaks in the ATR hypomorphic mutant compared to ATR wild-type cells. Our findings demonstrate that the ATR kinase regulates and is regulated by H2S.
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Affiliation(s)
- Jie Chen
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, Louisiana, 71130, United States
| | - Xinggui Shen
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, Louisiana, 71130, United States
| | - Sibile Pardue
- Department of Cell Biology & Anatomy, LSU Health Sciences Center Shreveport, Shreveport, Louisiana, 71130, United States
| | - Andrew T Meram
- Head & Neck Oncologic/Microvascular Reconstructive Surgery Department of Oral & Maxillofacial/Head & Neck Surgery, Louisiana State University Health Sciences Center, Shreveport, LA, United States
| | - Saranya Rajendran
- Department of Cell Biology & Anatomy, LSU Health Sciences Center Shreveport, Shreveport, Louisiana, 71130, United States
| | - Ghali E Ghali
- Head & Neck Oncologic/Microvascular Reconstructive Surgery Department of Oral & Maxillofacial/Head & Neck Surgery, Louisiana State University Health Sciences Center, Shreveport, LA, United States
| | - Christopher G Kevil
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, Louisiana, 71130, United States; Department of Cell Biology & Anatomy, LSU Health Sciences Center Shreveport, Shreveport, Louisiana, 71130, United States.
| | - Rodney E Shackelford
- Department of Pathology & Translational Pathobiology, LSU Health Sciences Center Shreveport, Shreveport, Louisiana, 71130, United States.
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Rada M, Barlev N, Macip S. BTK: a two-faced effector in cancer and tumour suppression. Cell Death Dis 2018; 9:1064. [PMID: 30337526 PMCID: PMC6193937 DOI: 10.1038/s41419-018-1122-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 10/01/2018] [Indexed: 12/15/2022]
Abstract
Many genes of the human genome display pleiotropic activity, playing an important role in two or more unrelated pathways. Surprisingly, some of these functions can even be antagonistic, often letting to divergent functional outcomes depending on microenviromental cues and tissue/cell type-dependent parameters. Lately, the Bruton’s tyrosine kinase (BTK) has emerged as one of such pleiotropic genes, with opposing effects in cancer pathways. While it has long been considered oncogenic in the context of B cell malignancies, recent data shows that BTK can also act as a tumour suppressor in other cells, as an essential member of the p53 and p73 responses to damage. Since BTK inhibitors are already being used clinically, it is important to carefully review these new findings in order to fully understand the consequences of blocking BTK activity in all the cells of the organism.
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Affiliation(s)
- Miran Rada
- Department of Surgery, McGill University Health Center Research Institute, Cancer Research Program, Montreal, Quebec, Canada.,Department of Biology, School of Science, Faculty of Science and Education Sciences, University of Sulaimani, Sulaimaniyah, Kurdistan Region, Iraq
| | - Nickolai Barlev
- Institute of Cytology, RAS, Saint-Petersburg, Russia. .,Cell Signaling Laboratory, Moscow Institute of Physics and Technology, Dolgoprudnoye, Moscow Region, Russia.
| | - Salvador Macip
- Mechanisms of Cancer and Aging Laboratory, Department of Molecular and Cell Biology, University of Leicester, Leicester, UK
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48
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Muoio D, Berardinelli F, Leone S, Coluzzi E, di Masi A, Doria F, Freccero M, Sgura A, Folini M, Antoccia A. Naphthalene diimide-derivatives G-quadruplex ligands induce cell proliferation inhibition, mild telomeric dysfunction and cell cycle perturbation in U251MG glioma cells. FEBS J 2018; 285:3769-3785. [PMID: 30095224 DOI: 10.1111/febs.14628] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 04/30/2018] [Accepted: 08/07/2018] [Indexed: 12/17/2022]
Abstract
In the present paper, the biological effects of three different naphthalene diimides (NDIs) G-quadruplex (G4) ligands (H-NDI-Tyr, H-NDI-NMe2, and tetra-NDI-NMe2) were comparatively evaluated to those exerted by RHPS4, a well-characterized telomeric G4-ligand, in an in vitro model of glioblastoma. Data indicated that NDIs were very effective in blocking cell proliferation at nanomolar concentrations, although displaying a lower specificity for telomere targeting compared to RHPS4. In addition, differently from RHPS4, NDIs failed to enhance the effect of ionizing radiation, thus suggesting that additional targets other than telomeres could be involved in the strong NDI-mediated anti-proliferative effects. In order to test telomeric off-target action of NDIs, a panel of genes involved in tumor progression, DNA repair, telomere maintenance, and cell-cycle regulation were evaluated at transcriptional and translational level. Specifically, the compounds were able to cause a marked reduction of TERT and BCL2 amounts as well as to favor the accumulation of proteins involved in cell cycle control. A detailed cytofluorimetric analysis of cell cycle progression by means of bromodeoxyuridine (BrdU) incorporation and staining of phospho-histone H3 indicated that NDIs greatly reduce the progression through S-phase and lead to G1 accumulation of BrdU-positive cells. Taken together, these data indicated that, besides effects on telomeres and oncogenes such as Tert and Bcl2, nanomolar concentrations of NDIs determined a sustained block of cell proliferation by slowing down cell cycle progression during S-phase. In conclusion, our data indicate that NDIs G4-ligands are powerful antiproliferative agents, which act through mechanisms that ultimately lead to altered cell-cycle control.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Marco Folini
- Dipartimento di Ricerca Applicata e Sviluppo Tecnologico, Fondazione IRCCS Istituto Nazionale dei Tumori di MIlano, Milano, Italy
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49
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Yang L, Yang X, Tang Y, Zhang D, Zhu L, Wang S, Wang B, Ma T. Inhibition of DNA‑PK activity sensitizes A549 cells to X‑ray irradiation by inducing the ATM‑dependent DNA damage response. Mol Med Rep 2018; 17:7545-7552. [PMID: 29620203 PMCID: PMC5983948 DOI: 10.3892/mmr.2018.8828] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Accepted: 02/16/2018] [Indexed: 12/12/2022] Open
Abstract
Non‑small cell lung cancer (NSCLC) is radioresistant to X‑rays due to powerful cellular DNA damage repair mechanisms. DNA‑dependent protein kinase (DNA‑PK) is a key enzyme involved in DNA damage repair and the phenomenon and molecular mechanism of NSCLC radionsensitivity were investigated following inhibition of DNA‑PK activity. In the present study A549 cells were treated with the DNA‑PK inhibitor NU7026 and/or siRNA directed against ataxia telangiectasia mutated (ATM), followed by exposure to 4 Gy X‑ray irradiation. Radiosensitivity, DNA damage, apoptosis and protein expression were measured by colony formation assay, γH2AX foci immunofluorescence, Annexin V/PI staining and western blotting, respectively. A Balb/c‑nu/nu xenograft mouse model was established by subcutaneous injection of A549 cells and was used to examine the effect of administering NU7026 via intraperitoneal injection prior to 4 Gy X‑ray exposure. The xenograft tumors were weighed and observed by hematoxylin and eosin staining after irradiation. NU7026 treatment followed by X‑ray irradiation significantly decreased the colony formation ratio of A549 cells, and increased γH2AX foci and cell apoptosis. Furthermore, the combined treatment of NU7026 and X‑rays resulted in growth inhibition and cell apoptosis in A549 xenograft tumors. Consequently, apoptosis regulators full‑length transactivating (TA) p73 and an N‑terminally truncated (DN) p73 were upregulated and downregulated respectively, leading to activation of glucosyltransferases and Rab‑like GTPase activators and myotubularins domain‑containing 4 (GRAMD4) protein to reduce the Bcl‑2/Bax protein ratio. In addition, ATM siRNA efficiently prevented γH2AX foci formation, and enhanced NU7026‑induced inhibition of survival and promoted apoptosis. In conclusion, inhibition of DNA‑PK activity increased the radiosensitivity of A549 cells to X‑ray irradiation. NU7026 treatment activated the ATM‑dependent DNA damage response and induced p73 apoptosis pathway. DNA‑PK inhibitor may be an effective constituent of radiosensitization products. DNA damage repair pathway could be a potential target for radiosensitization.
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Affiliation(s)
- Lina Yang
- College of Food Science and Technology, Bohai University, Jinzhou, Liaoning 121013, P.R. China
| | - Xinrui Yang
- Center for Therapeutic Research of Hepatocarcinoma, Beijing 302 Hospital, Beijing 100039, P.R. China
| | - Yiwei Tang
- College of Food Science and Technology, Bohai University, Jinzhou, Liaoning 121013, P.R. China
| | - Defu Zhang
- College of Food Science and Technology, Bohai University, Jinzhou, Liaoning 121013, P.R. China
| | - Lijie Zhu
- College of Food Science and Technology, Bohai University, Jinzhou, Liaoning 121013, P.R. China
| | - Shengnan Wang
- College of Food Science and Technology, Bohai University, Jinzhou, Liaoning 121013, P.R. China
| | - Bo Wang
- College of Food Science and Technology, Bohai University, Jinzhou, Liaoning 121013, P.R. China
| | - Tao Ma
- College of Food Science and Technology, Bohai University, Jinzhou, Liaoning 121013, P.R. China
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50
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Krüger K, Geist K, Stuhldreier F, Schumacher L, Blümel L, Remke M, Wesselborg S, Stork B, Klöcker N, Bormann S, Roos WP, Honnen S, Fritz G. Multiple DNA damage-dependent and DNA damage-independent stress responses define the outcome of ATR/Chk1 targeting in medulloblastoma cells. Cancer Lett 2018; 430:34-46. [PMID: 29753759 DOI: 10.1016/j.canlet.2018.05.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 05/03/2018] [Accepted: 05/08/2018] [Indexed: 01/04/2023]
Abstract
Targeting of oncogene-driven replicative stress as therapeutic option for high-risk medullobastoma was assessed using a panel of medulloblastoma cells differing in their c-Myc expression [i.e. group SHH (c-Myc low) vs. group 3 (c-Myc high)]. High c-Myc levels were associated with hypersensitivity to pharmacological Chk1 and ATR inhibition but not to CDK inhibition nor to conventional (genotoxic) anticancer therapeutics. The enhanced sensitivity of group 3 medulloblastoma cells to Chk1 inhibitors likely results from enhanced damage to intracellular organelles, elevated replicative stress and DNA damage and activation of apoptosis/necrosis. Furthermore, Chk1 inhibition differentially affected c-Myc expression and functions. In c-Myc high cells, Chk1 blockage decreased c-Myc and p-GSK3α protein and increased p21 and GADD45A mRNA expression. By contrast, c-Myc low cells revealed increased p-GSK3β protein and CHOP and DUSP1 mRNA levels. Inhibition of Chk1 sensitized medulloblastoma cells to additional replication stress evoked by cisplatin independent of c-Myc. Importantly, Chk1 inhibition only caused minor toxicity in primary rat neurons in vitro. Collectively, targeting of ATR/Chk1 effectively triggers death in high-risk medulloblastoma, potentiates the anticancer efficacy of cisplatin and is well tolerated in non-cancerous neuronal cells.
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Affiliation(s)
- Katharina Krüger
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Katharina Geist
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Fabian Stuhldreier
- Institute of Molecular Medicine I, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Lena Schumacher
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Lena Blümel
- Clinic of Pediatric Oncology/Neuro-Oncology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Marc Remke
- Clinic of Pediatric Oncology/Neuro-Oncology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Sebastian Wesselborg
- Institute of Molecular Medicine I, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Björn Stork
- Institute of Molecular Medicine I, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Nicolaj Klöcker
- Institute of Neurophysiology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Stefanie Bormann
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Wynand P Roos
- Institute of Toxicology, University Medical Center, Obere Zahlbacher Str. 67, 55131, Mainz, Germany
| | - Sebastian Honnen
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Gerhard Fritz
- Institute of Toxicology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstrasse 5, 40225, Düsseldorf, Germany.
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