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Zhang G, Sang T, Chen X, Ge C, Li B, Tian Y, Li M, Liu S, Xia Z, Li H, Xiao F, Liu S. Orychophragine D:A new 2-piperazinone fused 5-azacytosine type alkaloid with radioprotective activity from the seeds of Orychophragmus violaceus. Fitoterapia 2023; 168:105544. [PMID: 37182750 DOI: 10.1016/j.fitote.2023.105544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 05/10/2023] [Accepted: 05/11/2023] [Indexed: 05/16/2023]
Abstract
A new alkaloid, Orychophragine D (1), together with three known alkaloids, were isolated from the seeds of Orychophragmus violaceus. Orychophragine D represented the first example of 2-piperazinone fused 5-azacytosine skeleton. Their structures and absolute configurations were determined by spectroscopic analyses and X-ray crystallography. Compared to Ex-RAD, compound 1 exhibited a significant radioprotective activity on cell survival of irradiated HUVEC. In vivo experiments showed that 1 not only remarkably enhanced the survival of irradiated mice in 30 days, but also significantly promoted the recovery of the blood system of irradiated mice. These results suggested that 1 was valuable for further research as promising radioprotectors.
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Affiliation(s)
- Guangjie Zhang
- Beijing Institute of Radiation Medicine, Beijng 100850, China.
| | - Tian Sang
- Beijing Institute of Radiation Medicine, Beijng 100850, China
| | - Xiaolan Chen
- Beijing Institute of Radiation Medicine, Beijng 100850, China; Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Chunbo Ge
- Beijing Institute of Radiation Medicine, Beijng 100850, China; Hebei University, Baoding 071002, China
| | - Bin Li
- Beijing Institute of Radiation Medicine, Beijng 100850, China
| | - Ying Tian
- Beijing Institute of Radiation Medicine, Beijng 100850, China
| | - Min Li
- Beijing Institute of Radiation Medicine, Beijng 100850, China
| | - Sifan Liu
- Beijing Institute of Radiation Medicine, Beijng 100850, China
| | - Ziming Xia
- Beijing Institute of Radiation Medicine, Beijng 100850, China
| | - Haixia Li
- Beijing Institute of Radiation Medicine, Beijng 100850, China
| | - Fengjun Xiao
- Beijing Institute of Radiation Medicine, Beijng 100850, China.
| | - Shuchen Liu
- Beijing Institute of Radiation Medicine, Beijng 100850, China.
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Soliman AM, Mekkawy MH, Karam HM, Higgins M, Dinkova-Kostova AT, Ghorab MM. Novel iodinated quinazolinones bearing sulfonamide as new scaffold targeting radiation induced oxidative stress. Bioorg Med Chem Lett 2021; 42:128002. [PMID: 33811990 DOI: 10.1016/j.bmcl.2021.128002] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 03/23/2021] [Accepted: 03/23/2021] [Indexed: 12/18/2022]
Abstract
Reactive oxygen species (ROS) play an integral role in the pathogenesis of most diseases. This work presents the design and synthesis of fourteen new diiodoquinazolinone derivatives bearing benzenesulfonamide moiety with variable acetamide tail and evaluation of their ability to activate nuclear factor erythroid 2-related factor 2 (Nrf2) using its classical target NAD(P)H: quinone oxidoreductase 1 (NQO1) in Hepa1c1c7 murine hepatoma cells. The N-(2-chloropyridin-3-yl)-2-((6,8-diiodo-4-oxo-3-(4-sulfamoylphenyl)-3,4-dihydroquinazolin-2-yl)thio) acetamide 17 was the most potent NQO1 inducer (CD = 25 µM) with free radical scavenging activity (IC50 = 28 µM) and in vivo median lethal dose (LD50) of 500 mg/Kg. The possible radioprotective activity of compound 17 was evaluated in (7 Gy) irradiated mice. Compound 17 showed a reduction in radiation induced oxidative stress as evidenced by the lower levels of ROS, malondialdehyde (MDA) and NQO1 in liver tissues. Moreover, compound 17 showed improvement in the complete blood count (CBC) of irradiated mice and decreased mortality over 30 days following irradiation. Additionally, docking studies inside the Nrf2-binding site of Kelch-like ECH associated protein 1 (Keap1), the main negative regulator of Nrf2, confirmed that 17 revealed the same interactions with the key amino acids as those of the co-crystallized ligand. This study identifies 17 as a novel antioxidant that protects against the harmful effect of radiation.
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Affiliation(s)
- Aiten M Soliman
- Department of Drug Radiation Research, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Nasr City P.O. Box 29, Cairo 11765, Egypt
| | - Mai H Mekkawy
- Department of Drug Radiation Research, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Nasr City P.O. Box 29, Cairo 11765, Egypt
| | - Heba M Karam
- Department of Drug Radiation Research, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Nasr City P.O. Box 29, Cairo 11765, Egypt
| | - Maureen Higgins
- Jacqui Wood Cancer Centre, Division of Cellular Medicine, School of Medicine, University of Dundee, Dundee DD1 9SY, Scotland, UK
| | - Albena T Dinkova-Kostova
- Jacqui Wood Cancer Centre, Division of Cellular Medicine, School of Medicine, University of Dundee, Dundee DD1 9SY, Scotland, UK; Department of Pharmacology and Molecular Sciences and Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Mostafa M Ghorab
- Department of Drug Radiation Research, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Nasr City P.O. Box 29, Cairo 11765, Egypt.
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Beinke C, Scherthan H, Port M, Popp T, Hermann C, Eder S. Triterpenoid CDDO-Me induces ROS generation and up-regulates cellular levels of antioxidative enzymes without induction of DSBs in human peripheral blood mononuclear cells. Radiat Environ Biophys 2020; 59:461-472. [PMID: 32409897 PMCID: PMC7369132 DOI: 10.1007/s00411-020-00847-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 04/30/2020] [Indexed: 05/11/2023]
Abstract
Ionizing radiation produces reactive oxygen species (ROS) leading to cellular DNA damage. Therefore, patients undergoing radiation therapy or first responders in radiological accident scenarios could both benefit from the identification of specifically acting pharmacological radiomitigators. The synthetic triterpenoid bardoxolone-methyl (CDDO-Me) has previously been shown to exert antioxidant, anti-inflammatory and anticancer activities in several cell lines, in part by enhancing the DNA damage response. In our study, we examined the effect of nanomolar concentrations of CDDO-Me in human peripheral blood mononuclear cells (PBMC). We observed increased cellular levels of the antioxidative enzymes heme oxygenase-1 (HO-1), NAD(P)H dehydrogenase (quinone1) and mitochondrial superoxide dismutase 2 by immunoblotting. Surprisingly, we found increased intracellular ROS-levels using imaging flow-cytometry. However, the radiation-induced DNA double-strand break (DSB) formation using the γ-H2AX + 53BP1 DSB focus assay and the cytokinesis-block micronucleus assay both revealed, that nanomolar CDDO-Me pre-treatment of PBMC for 2 h or 6 h ahead of X irradiation with 2 Gy did neither significantly affect γ-H2AX + 53BP1 DSB foci formation nor the frequency of micronuclei. CDDO-Me treatment also failed to alter the nuclear division index and the frequency of IR-induced PBMC apoptosis as investigated by Annexin V-labeled live-cell imaging. Our results indicate that pharmacologically increased cellular concentrations of antioxidative enzymes might not necessarily exert radiomitigating short-term effects in IR-exposed PBMC. However, the increase of antioxidative enzymes could also be a result of a defensive cellular mechanism towards elevated ROS levels.
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Affiliation(s)
- Christina Beinke
- Bundeswehr Institute of Radiobiology Affiliated to the University Ulm, Neuherbergstr. 11, 80937, Munich, Germany.
| | - Harry Scherthan
- Bundeswehr Institute of Radiobiology Affiliated to the University Ulm, Neuherbergstr. 11, 80937, Munich, Germany
| | - Matthias Port
- Bundeswehr Institute of Radiobiology Affiliated to the University Ulm, Neuherbergstr. 11, 80937, Munich, Germany
| | - Tanja Popp
- Bundeswehr Institute of Radiobiology Affiliated to the University Ulm, Neuherbergstr. 11, 80937, Munich, Germany
| | - Cornelius Hermann
- Bundeswehr Institute of Radiobiology Affiliated to the University Ulm, Neuherbergstr. 11, 80937, Munich, Germany
| | - Stefan Eder
- Bundeswehr Institute of Radiobiology Affiliated to the University Ulm, Neuherbergstr. 11, 80937, Munich, Germany
- Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine, Inner City Clinic, University Hospital of Munich (LMU), Munich, Germany
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Ye B, Shen W, Shi M, Zhang Y, Xu C, Zhao Z. Intein-mediated backbone cyclization of entolimod confers enhanced radioprotective activity in mouse models. PeerJ 2018; 6:e5043. [PMID: 29938138 PMCID: PMC6011820 DOI: 10.7717/peerj.5043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 05/31/2018] [Indexed: 12/03/2022] Open
Abstract
Background Entolimod is a Salmonella enterica flagellin derivate. Previous work has demonstrated that entolimod effectively protects mice and non-human primates from ionizing radiation. However, it caused a “flu-like” syndrome after radioprotective and anticancer clinical application, indicating some type of immunogenicity and toxicity. Cyclization is commonly used to improve the in vivo stability and activity of peptides and proteins. Methods We designed and constructed cyclic entolimod using split Nostoc punctiforme DnaE intein with almost 100% cyclization efficiency. We adopted different strategies to purify the linear and circular entolimod due to their different topologies. Both of linear and circular entolimod were first purified by Ni-chelating affinity chromatography, and then the linear and circular entolimod were purified by size-exclusion and ion-exchange chromatography, respectively. Results The circular entolimod showed significantly increased both the in vitro NF-κB signaling and in vivo radioprotective activity in mice. Conclusion Our data indicates that circular entolimod might be a good candidate for further clinical investigation.
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Affiliation(s)
- Bingyu Ye
- College of Life Science, Henan Normal University, Xinxiang, China.,State Key Laboratory Cultivation Base for Cell Differentiation Regulation, College of Life Science, Henan Normal University, Xinxiang, China.,Beijing Institute of Biotechnology, Beijing, China
| | - Wenlong Shen
- Beijing Institute of Biotechnology, Beijing, China
| | - Minglei Shi
- Beijing Institute of Biotechnology, Beijing, China
| | - Yan Zhang
- Beijing Institute of Biotechnology, Beijing, China
| | - Cunshuan Xu
- College of Life Science, Henan Normal University, Xinxiang, China.,State Key Laboratory Cultivation Base for Cell Differentiation Regulation, College of Life Science, Henan Normal University, Xinxiang, China
| | - Zhihu Zhao
- Beijing Institute of Biotechnology, Beijing, China
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Li X, Wang L, Wang Z. Radioprotective activity of neutral polysaccharides isolated from the fruiting bodies of Hohenbuehelia serotina. Phys Med 2015; 31:352-9. [PMID: 25703009 DOI: 10.1016/j.ejmp.2015.02.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Revised: 01/29/2015] [Accepted: 02/02/2015] [Indexed: 01/14/2023] Open
Abstract
In this study, the radioprotective effect of neutral polysaccharides from Hohenbuehelia serotina (NTHSP) against the damages induced by (60)Co-γ radiation was investigated. The results showed that NTHSP could significantly improve the activity of glutathione peroxidase (GSH-Px) and increase the contents of glutathione (GSH) and ceruloplasmin in plasma after treated with 6 Gy-radiation compared with the radiation controls (p < 0.05). Furthermore, administration with NTHSP could effectively increase the quantity of marrow DNA (p < 0.05) and reduce the rates of chromosome aberration and micronuclei (p < 0.01) in bone marrows of mice. In addition, NTHSP could markedly inhibit the expressions of Bax protein and promote the expressions of Bcl-2 protein, accordingly inhibit the releases of cytochrome c and expressions of activated Caspase-3, and therefore block the mitochondrial apoptotic pathway of splenocytes in mice induced by (60)Co-γ radiation. These results suggested that NTHSP might be a natural radioprotective agent against the injuries induced by radiation.
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Affiliation(s)
- Xiaoyu Li
- School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
| | - Lu Wang
- School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China
| | - Zhenyu Wang
- School of Food Science and Engineering, Harbin Institute of Technology, Harbin 150090, PR China
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