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Ren EC, Zhuo NZ, Goh ZY, Bonne I, Malleret B, Ko HL. cccDNA-Targeted Drug Screen Reveals a Class of Antihistamines as Suppressors of HBV Genome Levels. Biomolecules 2023; 13:1438. [PMID: 37892121 PMCID: PMC10604930 DOI: 10.3390/biom13101438] [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: 07/19/2023] [Revised: 09/08/2023] [Accepted: 09/22/2023] [Indexed: 10/29/2023] Open
Abstract
Chronic infection with hepatitis B virus (HBV) is incurable, as the current therapeutics cannot eliminate its persistent genomic material, cccDNA. Screening systems for cccDNA-targeting therapeutics are unavailable, as low copies of cccDNA in vitro complicate detection. To address this, cccDNA copies were massively increased to levels detectable via automated plate readers. This was achieved via continuous infection in a contact-free co-culture of an HBV generator (clone F881), which stably produced clinically relevant amounts of HBV, and HBV acceptors selected to carry high cccDNA loads. cccDNA-targeted therapeutics were then identified via reduced cccDNA-specific fluorescence, taking differences in the cell numbers and viability into account. Amongst the drugs tested, the H1 antihistamine Bilastine, HBVCP inhibitors and, surprisingly, current HBV therapeutics downregulated the cccDNA significantly, reflecting the assay's accuracy and sensitivity in identifying drugs that induce subtle changes in cccDNA levels, which take years to manifest in vivo. Bilastine was the only therapeutic that did not reduce HBV production from F881, indicating it to be a novel direct suppressor of cccDNA levels. When further assessed, only the structurally similar antihistamines Pitolisant and Nizatidine suppressed cccDNA levels when other H1 antihistamines could not. Taken together, our rapid fluorescence cccDNA-targeted drug screen successfully identified a class of molecules with the potential to treat hepatitis B.
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Affiliation(s)
- Ee Chee Ren
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), 8A Biomedical Grove, Immunos, #03-06, Singapore 138648, Singapore; (N.Z.Z.); (Z.Y.G.); (B.M.)
- Immunology Translational Research Programme, Department of Microbiology & Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Block MD4, Level 3, Singapore 117545, Singapore;
| | - Nicole Ziyi Zhuo
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), 8A Biomedical Grove, Immunos, #03-06, Singapore 138648, Singapore; (N.Z.Z.); (Z.Y.G.); (B.M.)
| | - Zhi Yi Goh
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), 8A Biomedical Grove, Immunos, #03-06, Singapore 138648, Singapore; (N.Z.Z.); (Z.Y.G.); (B.M.)
- Immunology Translational Research Programme, Department of Microbiology & Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Block MD4, Level 3, Singapore 117545, Singapore;
| | - Isabelle Bonne
- Immunology Translational Research Programme, Department of Microbiology & Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Block MD4, Level 3, Singapore 117545, Singapore;
- Electron Microscopy Unit, Yong Loo Lin School of Medicine, National University of Singapore, MD1, Tahir Foundation Building, #B1-01, 12 Science Drive 2, Singapore 117549, Singapore
- Immunology Programme, Life Sciences Institute, Center for Life Sciences, National University of Singapore, #05-02, 28 Medical Drive, Singapore 117456, Singapore
| | - Benoît Malleret
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), 8A Biomedical Grove, Immunos, #03-06, Singapore 138648, Singapore; (N.Z.Z.); (Z.Y.G.); (B.M.)
- Immunology Translational Research Programme, Department of Microbiology & Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Block MD4, Level 3, Singapore 117545, Singapore;
- Electron Microscopy Unit, Yong Loo Lin School of Medicine, National University of Singapore, MD1, Tahir Foundation Building, #B1-01, 12 Science Drive 2, Singapore 117549, Singapore
| | - Hui Ling Ko
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A*STAR), 8A Biomedical Grove, Immunos, #03-06, Singapore 138648, Singapore; (N.Z.Z.); (Z.Y.G.); (B.M.)
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Tan A, Doig CL. NAD + Degrading Enzymes, Evidence for Roles During Infection. Front Mol Biosci 2021; 8:697359. [PMID: 34485381 PMCID: PMC8415550 DOI: 10.3389/fmolb.2021.697359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 08/06/2021] [Indexed: 12/13/2022] Open
Abstract
Declines in cellular nicotinamide adenine dinucleotide (NAD) contribute to metabolic dysfunction, increase susceptibility to disease, and occur as a result of pathogenic infection. The enzymatic cleavage of NAD+ transfers ADP-ribose (ADPr) to substrate proteins generating mono-ADP-ribose (MAR), poly-ADP-ribose (PAR) or O-acetyl-ADP-ribose (OAADPr). These important post-translational modifications have roles in both immune response activation and the advancement of infection. In particular, emergent data show viral infection stimulates activation of poly (ADP-ribose) polymerase (PARP) mediated NAD+ depletion and stimulates hydrolysis of existing ADP-ribosylation modifications. These studies are important for us to better understand the value of NAD+ maintenance upon the biology of infection. This review focuses specifically upon the NAD+ utilising enzymes, discusses existing knowledge surrounding their roles in infection, their NAD+ depletion capability and their influence within pathogenic infection.
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Affiliation(s)
- Arnold Tan
- Interdisciplinary Science and Technology Centre, Department of Biosciences, School of Science and Technology, Nottingham Trent University, Nottingham, United Kingdom
| | - Craig L Doig
- Interdisciplinary Science and Technology Centre, Department of Biosciences, School of Science and Technology, Nottingham Trent University, Nottingham, United Kingdom
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Poly-ADP Ribosyl Polymerase 1 (PARP1) Regulates Influenza A Virus Polymerase. Adv Virol 2019; 2019:8512363. [PMID: 31015836 PMCID: PMC6444269 DOI: 10.1155/2019/8512363] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 01/16/2019] [Accepted: 02/11/2019] [Indexed: 11/17/2022] Open
Abstract
Influenza A viruses (IAV) are evolutionarily successful pathogens, capable of infecting a number of avian and mammalian species and responsible for pandemic and seasonal epidemic disease in humans. To infect new species, IAV typically must overcome a number of species barriers to entry, replication, and egress, even while virus replication is counteracted by antiviral host factors and innate immune mechanisms. A number of host factors have been found to regulate the replication of IAV by interacting with the viral RNA-dependent RNA polymerase (RdRP). The host factor PARP1, a poly-ADP ribosyl polymerase, was required for optimal functions of human, swine, and avian influenza RdRP in human 293T cells. In IAV infection, PARP1 was required for efficient synthesis of viral nucleoprotein (NP) in human lung A549 cells. Intriguingly, pharmacological inhibition of PARP1 enzymatic activity (PARylation) by 4-amino-1,8-naphthalimide led to a 4-fold increase in RdRP activity, and a 2.3-fold increase in virus titer. Exogenous expression of the natural PARylation inhibitor PARG also enhanced RdRP activity. These data suggest a virus-host interaction dynamic where PARP1 protein itself is required, but cellular PARylation has a distinct suppressive modality, on influenza A viral polymerase activity in human cells.
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Ruan Q, Ruan J, Zhang W, Qian F, Yu Z. Targeting NAD + degradation: The therapeutic potential of flavonoids for Alzheimer's disease and cognitive frailty. Pharmacol Res 2017; 128:345-358. [PMID: 28847709 DOI: 10.1016/j.phrs.2017.08.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 08/02/2017] [Accepted: 08/20/2017] [Indexed: 01/04/2023]
Abstract
Flavonoids are efficacious candidates as pharmaceuticals or nutraceuticals in the treatment of Alzheimer's disease (AD), aging and other age-related chronic inflammatory diseases. Natural flavonoids reduce pathological hallmarks, extracellular amyloid deposits and neurofibrillary tangles by mediating amyloid precursor protein (APP) processing, Aβ accumulation and tau pathology. The antioxidant and anti-inflammatory actions as well as modulation of sirtuins and telomeres are also involved in the amelioration of aging, neurodegeneration and other age-related diseases. Recently, some flavonoids were shown to inhibit poly (ADP-ribose) polymerases (PARPs) and cyclic ADP-ribose (cADP) synthases (CD38 and CD157), elevate intracellular nicotinamide adenine dinucleotide+ (NAD+) levels and activate NAD+ dependent sirtuin -mediated signaling pathways. We summarized how flavonoids reduce the degradation of NAD+ with an emphasis on the mechanisms through which flavonoids affect the NAD+-sirtuin axis to protect against AD. Aging and age-related diseases as well as a decline in the physiological reserve are the risk factors for cognitive frailty. Flavonoids with multiple therapeutic targets may also be potential candidates for the prevention and treatment of cognitive frailty.
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Affiliation(s)
- Qingwei Ruan
- Shanghai Institute of Geriatrics and Gerontology, Shanghai Key Laboratory of Clinical Geriatrics, Huadong Hospital, and Research Center of Aging and Medicine, Shanghai Medical College, Fudan University, Shanghai 200040, China
| | - Jian Ruan
- Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Weibin Zhang
- Shanghai Institute of Geriatrics and Gerontology, Shanghai Key Laboratory of Clinical Geriatrics, Huadong Hospital, and Research Center of Aging and Medicine, Shanghai Medical College, Fudan University, Shanghai 200040, China
| | - Feng Qian
- Ministry of Education Key Laboratory of Contemporary Anthropology, School of Life Sciences, Fudan University, Shanghai 200438, China
| | - Zhuowei Yu
- Shanghai Institute of Geriatrics and Gerontology, Shanghai Key Laboratory of Clinical Geriatrics, Huadong Hospital, and Research Center of Aging and Medicine, Shanghai Medical College, Fudan University, Shanghai 200040, China.
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Gutierrez DA, Valdes L, Serguera C, Llano M. Poly(ADP-ribose) polymerase-1 silences retroviruses independently of viral DNA integration or heterochromatin formation. J Gen Virol 2016; 97:1686-1692. [PMID: 27028089 DOI: 10.1099/jgv.0.000466] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
PARP-1 silences retrotransposons in Drosophila, through heterochromatin maintenance, and integrated retroviruses in chicken. Here, we determined the role of viral DNA integration and cellular heterochromatin in PARP-1-mediated retroviral silencing using HIV-1-derived lentiviral vectors and Rous-associated virus type 1 (RAV-1) as models. Analysis of the infection of PARP-1 knockout and control cells with HIV-1 harbouring WT integrase, in the presence or absence of an integrase inhibitor, or catalytic-dead mutant integrase indicated that silencing does not require viral DNA integration. The mechanism involves the catalytic activity of histone deacetylases but not that of PARP-1. In contrast to Drosophila, lack of PARP-1 in avian cells did not affect chromatin compaction globally or at the RAV-1 provirus, or the cellular levels of histone H3 N-terminal acetylated or Lys27 trimethylated, as indicated by micrococcal nuclease accessibility and immunoblot assays. Therefore, PARP-1 represses retroviruses prior to viral DNA integration by mechanisms involving histone deacetylases but not heterochromatin formation.
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Affiliation(s)
- Denisse A Gutierrez
- Department of Biological Sciences, University of Texas at El Paso, 500 West University Ave., El Paso, TX 79968, USA
| | - Luis Valdes
- Department of Biological Sciences, University of Texas at El Paso, 500 West University Ave., El Paso, TX 79968, USA
| | | | - Manuel Llano
- Department of Biological Sciences, University of Texas at El Paso, 500 West University Ave., El Paso, TX 79968, USA
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Guillot C, Favaudon V, Herceg Z, Sagne C, Sauvaigo S, Merle P, Hall J, Chemin I. PARP inhibition and the radiosensitizing effects of the PARP inhibitor ABT-888 in in vitro hepatocellular carcinoma models. BMC Cancer 2014; 14:603. [PMID: 25139788 PMCID: PMC4153905 DOI: 10.1186/1471-2407-14-603] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 08/06/2014] [Indexed: 12/17/2022] Open
Abstract
Background Hepatocellular carcinoma is the third cause of cancer related death for which new treatment strategies are needed. Targeting DNA repair pathways to sensitize tumor cells to chemo- or radiotherapy is under investigation for the treatment of several cancers with poly(ADP-ribose) polymerase (PARP) inhibitors showing great potential. The aim of this preclinical study was to evaluate the expression of PARP and PARG genes in a panel of liver cancer cell lines and primary human hepatocytes, their DNA repair capacity and assess the impact on cell survival of PARP inhibitors alone and in combination with radiotherapy. Methods Quantitative PCR was used to measure PARP-1, -2, -3 and PARG mRNA levels and western blotting for PARP-1 protein expression and ADP-ribose polymer formation after exposure of cells to doxorubicin, a topoisomerase II poison. DNA repair capacity was assessed using an in vitro DNA lesion excision/synthesis assay and the effects on cell killing of the PARP inhibitor ABT-888 alone and in combination with ionizing radiation using clonogenic survival. Results Although a wide range in expression of the PARPs and PARG was found correlations between PARP-1 and PARP-2 mRNA levels and PARP-1 mRNA and protein levels were noted. However these expression profiles were not predictive of PARP activity in the different cell lines that also showed variability in excision/synthesis repair capacity. 4 of the 7 lines were sensitive to ABT-888 alone and the two lines tested showed enhanced radiosensitivity in the presence of ABT-888. Conclusions PARP inhibitors combined with radiotherapy show potential as a therapeutic option for hepatocellular carcinoma.
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Affiliation(s)
| | | | | | | | | | | | | | - Isabelle Chemin
- UMR INSERM U1052 CNRS 5286, CRCL, 151 Cours A Thomas, Lyon F-69008, France.
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