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Molecular biological mechanism of action in cancer therapies: Juglone and its derivatives, the future of development. Biomed Pharmacother 2022; 148:112785. [PMID: 35272138 DOI: 10.1016/j.biopha.2022.112785] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Revised: 02/20/2022] [Accepted: 03/02/2022] [Indexed: 11/20/2022] Open
Abstract
Juglone (5 - hydroxy - 1, 4 - naphthalene diketone) is a kind of natural naphthoquinone, present in the roots, leaves, nut-hulls, bark and wood of walnut trees. Recent studies have found that Juglone has special significance in the treatment of cancer, which plays a significant role in the resistance of cancer cell proliferation, induction of cancer cell apoptosis, induction of autophagy, anti-angiogenesis and inhibition of cancer cell migration and invasion, etc. Additionally, its derivatives also play a tumor suppressive effect. In conclusion, Juglone and its derivatives have been identified as effective anticancer drugs. This paper reviews action mechanisms of Juglone and its derivatives in cancer treatment.
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Induction of Oxidative Stress and Mitochondrial Dysfunction by Juglone Affects the Development of Bovine Oocytes. Int J Mol Sci 2020; 22:ijms22010168. [PMID: 33375280 PMCID: PMC7794829 DOI: 10.3390/ijms22010168] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 12/22/2020] [Indexed: 12/22/2022] Open
Abstract
Juglone, a major naphthalenedione component of walnut trees, has long been used in traditional medicine as an antimicrobial and antitumor agent. Nonetheless, its impact on oocyte and preimplantation embryo development has not been entirely clarified. Using the bovine model, we sought to elucidate the impact of juglone treatment during the in vitro maturation (IVM) of oocytes on their maturation and development of embryos. Results showed a severe reduction in oocyte nuclear maturation and cumulus expansion and a significant increase in mitochondrial dysfunction and reactive oxygen species (ROS) levels in cumulus-oocyte complexes (COCs) treated with juglone (12.5, 25.0, and 50.0 µM). In addition, RT-qPCR showed downregulation of the expansion-related (HAS2, TNFAIP6, PTX3, and PTGS2) and mitochondrial (ATPase6 and ATP5F1E) genes in juglone-treated COCs. Moreover, the development rates of day 4 total cleavage and 8-16 cell stage embryos, as well as day 8 blastocysts, were significantly reduced following exposure to juglone. Using immunofluorescence, the apoptotic marker caspase-9 was overexpressed in oocytes exposed to juglone (25.0 µM) compared to the untreated control. In conclusion, our study reports that exposing bovine oocytes to 12.5-50.0 µM of juglone can reduce their development through the direct induction of ROS accumulation, apoptosis, and mitochondrial dysfunction.
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Zhang X, Zhou C, Cheng W, Tao R, Xu H, Liu H. Vitamin C protects early mouse embryos against juglone toxicity. Reprod Toxicol 2020; 98:200-208. [PMID: 33010468 DOI: 10.1016/j.reprotox.2020.09.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 09/16/2020] [Accepted: 09/27/2020] [Indexed: 01/13/2023]
Abstract
Juglone, a naphthoquinone isolated from many species of the Juglandaceae (walnut) family, has been used in traditional Chinese medicine for centuries for its various pharmacological effects. Our previous research found its toxic effects on oocytes maturation. But we still know a little about its toxic effects on embryo development. Here, we used mouse embryo as a model to explore the effects of juglone on early mammalian embryo development. Exposure to juglone significantly decreased the development rate in early mouse embryos in vitro. Moreover, juglone exposure led to developmental arrest by disturbing mitochondrial function, producing abnormal epigenetic modifications, inducing high levels of oxidative stress and DNA damage, and increasing the rate of embryonic cell apoptosis. However, vitamin C (VC) ameliorated the toxic effects of juglone to a certain extent. Overall, juglone has a toxic effect on early embryo development through the generation of ROS and apoptosis. But VC was able to protect against these juglone-induced defects. These results not only give a new perspective on juglone's pharmacological effects on early mammalian embryo development, but also provide ideas for the better application of this agent in traditional Chinese medicine.
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Affiliation(s)
- Xue Zhang
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Changyin Zhou
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Wenxiu Cheng
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Ruixin Tao
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Hongxia Xu
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Honglin Liu
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China.
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Zhang X, Li W, Sun X, Li J, Wu W, Liu H. Vitamin C protects against defects induced by juglone during porcine oocyte maturation. J Cell Physiol 2019; 234:19574-19581. [PMID: 30980384 DOI: 10.1002/jcp.28555] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 03/04/2019] [Accepted: 03/06/2019] [Indexed: 12/12/2022]
Abstract
Juglone, a naphthoquinone isolated from many species of the Juglandaceae family, has been used in traditional Chinese medicine for centuries because of its antiviral, antibacterial, and antitumor activities. However, the toxicity of juglone has also been demonstrated. Here, we used porcine oocytes as a model to explore the effects of juglone on oocyte maturation and studied the impact of vitamin C (VC) administration on juglone exposure-induced meiosis defects. Exposure to juglone significantly restricted cumulus cell expansion and decreased the first polar body extrusion. In addition, juglone exposure disturbed spindle organization, actin assembly, and the distribution of mitochondria during oocyte meiosis, while the acetylation level of α-tubulin was also reduced. These defects were all ameliorated by VC administration. Our findings indicate that juglone exposure induced meiotic failure in porcine oocytes, while VC protected against these defects during porcine oocyte maturation by ameliorating the organization of the cytoskeleton and mitochondrial distribution.
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Affiliation(s)
- Xue Zhang
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Weijian Li
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Xiaofan Sun
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Juan Li
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Wangjun Wu
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Honglin Liu
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China
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5
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Potential immunomodulatory effect of allelochemical juglone in mice vaccinated with BCG. Toxicon 2019; 157:43-52. [DOI: 10.1016/j.toxicon.2018.11.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 10/17/2018] [Accepted: 11/01/2018] [Indexed: 12/24/2022]
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Tirant M, Lotti T, Gianfaldoni S, Tchernev G, Wollina U, Bayer P. Integrative Dermatology - The Use of Herbals and Nutritional Supplements to Treat Dermatological Conditions. Open Access Maced J Med Sci 2018; 6:185-202. [PMID: 29484023 PMCID: PMC5816298 DOI: 10.3889/oamjms.2018.041] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 11/27/2017] [Accepted: 10/29/2017] [Indexed: 01/15/2023] Open
Abstract
From humble beginnings at the dawn of time to it's advanced and successful status today, this essay traces the history of natural medicine and the development of integrated dermatology to what it is today. Some of the most well-known natural (international and Australian) products with an application in dermatology are discussed. The history and functions of the Psoriasis Eczema Clinic and the products developed by its founder, Prof. Michael Tirant, are explained.
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Affiliation(s)
- Michael Tirant
- Psoriasis & Skin Clinic, 374 Nepean Highway Frankston Victoria, Melbourne 3199, Australia
| | - Torello Lotti
- University G. Marconi of Rome - Dermatology and Venereology, Rome, Italy
| | - Serena Gianfaldoni
- University G. Marconi of Rome - Dermatology and Venereology, Rome, Italy
| | - Georgi Tchernev
- Medical Institute of Ministry of Interior (MVR), Department of Dermatology, Venereology and Dermatologic Surgery, Sofia, Bulgaria
- ”Onkoderma”- Policlinic for Dermatology and Dermatologic Surgery, Sofia, Bulgaria
| | - Uwe Wollina
- Städtisches Klinikum Dresden - Department of Dermatology and Allergology, Dresden, Sachsen, Germany
| | - Philip Bayer
- Psoriasis & Skin Clinic, 374 Nepean Highway Frankston Victoria, Melbourne 3199, Australia
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Zhai JH, Wu Y, Wang XY, Cao Y, Xu K, Xu L, Guo Y. Antioxidation of Cerium Oxide Nanoparticles to Several Series of Oxidative Damage Related to Type II Diabetes Mellitus In Vitro. Med Sci Monit 2016; 22:3792-3797. [PMID: 27752033 PMCID: PMC5081232 DOI: 10.12659/msm.901068] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Background It is well known that cerium oxide nanoparticles (CeNPs) have intense antioxidant activity. The antioxidant property of CeNPs are widely used in different areas of research, but little is known about the oxidative damage of Cu2+ associated with Type II diabetes mellitus (T2DM). Material/Methods In our research, the function of CeNPs was tested for its protection of β-cells from the damage of Cu2+ or H2O2. We detected hydroxyl radicals using terephthalic acid assay, hydrogen peroxide using Amplex Ultra Red assay, and cell viability using MTT reduction. Results We found that CeNPs can persistently inhibit Cu2+/H2O2 evoked hydroxyl radicals and hydrogen peroxide in oxidative stress of β-cells. Conclusions CeNPs will be useful in developing strategies for the prevention of T2DM.
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Affiliation(s)
- Jing-Hui Zhai
- College of Pharmacy, Jilin University, Changchun, Jilin, China (mainland)
| | - Yi Wu
- College of Pharmacy, Jilin University, Changchun, Jilin, China (mainland)
| | - Xiao-Ying Wang
- Jilin Province People's Hospital, Jilin Province People's Hospital, Changchun, Jilin, China (mainland)
| | - Yue Cao
- Key Laboratory for Molecular Enzymology and Engineering, The Ministry of Education, School of Life Sciences, Jilin University, Changchun, Jilin, China (mainland)
| | - Kan Xu
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, Jilin, China (mainland)
| | - Li Xu
- Key Laboratory for Molecular Enzymology and Engineering, The Ministry of Education, School of Life Sciences, Jilin University, Changchun, Jilin, China (mainland)
| | - Yi Guo
- Key Laboratory for Molecular Enzymology and Engineering, The Ministry of Education, School of Life Sciences, Jilin University, Changchun, Jilin, China (mainland)
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Modulatory Effect of 2-(4-Hydroxyphenyl)amino-1,4-naphthoquinone on Endothelial Vasodilation in Rat Aorta. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:3939540. [PMID: 27672420 PMCID: PMC5031853 DOI: 10.1155/2016/3939540] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 08/09/2016] [Accepted: 08/22/2016] [Indexed: 12/03/2022]
Abstract
The vascular endothelium plays an essential role in the control of the blood flow. Pharmacological agents like quinone (menadione) at various doses modulate this process in a variety of ways. In this study, Q7, a 2-phenylamino-1,4-naphthoquinone derivative, significantly increased oxidative stress and induced vascular dysfunction at concentrations that were not cytotoxic to endothelial or vascular smooth muscle cells. Q7 reduced nitric oxide (NO) levels and endothelial vasodilation to acetylcholine in rat aorta. It also blunted the calcium release from intracellular stores by increasing the phenylephrine-induced vasoconstriction when CaCl2 was added to a calcium-free medium but did not affect the influx of calcium from extracellular space. Q7 increased the vasoconstriction to BaCl2 (10−3 M), an inward rectifying K+ channels blocker, and blocked the vasodilation to KCl (10−2 M) in aortic rings precontracted with BaCl2. This was recovered with sodium nitroprusside (10−8 M), a NO donor. In conclusion, Q7 induced vasoconstriction was through a modulation of cellular mechanisms involving calcium fluxes through K+ channels, and oxidative stress induced endothelium damage. These findings contribute to the characterization of new quinone derivatives with low cytotoxicity able to pharmacologically modulate vasodilation.
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Newmaster SG, Grguric M, Shanmughanandhan D, Ramalingam S, Ragupathy S. DNA barcoding detects contamination and substitution in North American herbal products. BMC Med 2013; 11:222. [PMID: 24120035 PMCID: PMC3851815 DOI: 10.1186/1741-7015-11-222] [Citation(s) in RCA: 275] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Accepted: 09/12/2013] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Herbal products available to consumers in the marketplace may be contaminated or substituted with alternative plant species and fillers that are not listed on the labels. According to the World Health Organization, the adulteration of herbal products is a threat to consumer safety. Our research aimed to investigate herbal product integrity and authenticity with the goal of protecting consumers from health risks associated with product substitution and contamination. METHODS We used DNA barcoding to conduct a blind test of the authenticity for (i) 44 herbal products representing 12 companies and 30 different species of herbs, and (ii) 50 leaf samples collected from 42 herbal species. Our laboratory also assembled the first standard reference material (SRM) herbal barcode library from 100 herbal species of known provenance that were used to identify the unknown herbal products and leaf samples. RESULTS We recovered DNA barcodes from most herbal products (91%) and all leaf samples (100%), with 95% species resolution using a tiered approach (rbcL + ITS2). Most (59%) of the products tested contained DNA barcodes from plant species not listed on the labels. Although we were able to authenticate almost half (48%) of the products, one-third of these also contained contaminants and or fillers not listed on the label. Product substitution occurred in 30/44 of the products tested and only 2/12 companies had products without any substitution, contamination or fillers. Some of the contaminants we found pose serious health risks to consumers. CONCLUSIONS Most of the herbal products tested were of poor quality, including considerable product substitution, contamination and use of fillers. These activities dilute the effectiveness of otherwise useful remedies, lowering the perceived value of all related products because of a lack of consumer confidence in them. We suggest that the herbal industry should embrace DNA barcoding for authenticating herbal products through testing of raw materials used in manufacturing products. The use of an SRM DNA herbal barcode library for testing bulk materials could provide a method for 'best practices? in the manufacturing of herbal products. This would provide consumers with safe, high quality herbal products.
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Affiliation(s)
- Steven G Newmaster
- Centre for Biodiversity Genomics, Biodiversity Institute of Ontario (BIO), University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Meghan Grguric
- Bachelor of Arts and Science Program, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Dhivya Shanmughanandhan
- Plant Genetic Engineering Laboratory, Department of Biotechnology, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India
| | - Sathishkumar Ramalingam
- Plant Genetic Engineering Laboratory, Department of Biotechnology, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India
| | - Subramanyam Ragupathy
- Centre for Biodiversity Genomics, Biodiversity Institute of Ontario (BIO), University of Guelph, Guelph, Ontario N1G 2W1, Canada
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Saling SC, Comar JF, Mito MS, Peralta RM, Bracht A. Actions of juglone on energy metabolism in the rat liver. Toxicol Appl Pharmacol 2011; 257:319-27. [PMID: 21945490 DOI: 10.1016/j.taap.2011.09.004] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 08/31/2011] [Accepted: 09/06/2011] [Indexed: 12/20/2022]
Abstract
Juglone is a phenolic compound used in popular medicine as a phytotherapic to treat inflammatory and infectious diseases. However, it also acts as an uncoupler of oxidative phosphorylation in isolated liver mitochondria and, thus, may interfere with the hepatic energy metabolism. The purpose of this work was to evaluate the effect of juglone on several metabolic parameters in the isolated perfused rat liver. Juglone, in the concentration range of 5 to 50μM, stimulated glycogenolysis, glycolysis and oxygen uptake. Gluconeogenesis from both lactate and alanine was inhibited with half-maximal effects at the concentrations of 14.9 and 15.7μM, respectively. The overall alanine transformation was increased by juglone, as indicated by the stimulated release of ammonia, urea, l-glutamate, lactate and pyruvate. A great increase (9-fold) in the tissue content of α-ketoglutarate was found, without a similar change in the l-glutamate content. The tissue contents of ATP were decreased, but those of ADP and AMP were increased. Experiments with isolated mitochondria fully confirmed previous notions about the uncoupling action of juglone. It can be concluded that juglone is active on metabolism at relatively low concentrations. In this particular it resembles more closely the classical uncoupler 2,4-dinitrophenol. Ingestion of high doses of juglone, thus, presents the same risks as the ingestion of 2,4-dinitrophenol which comprise excessive compromising of ATP production, hyperthermia and even death. Low doses, i.e., moderate consumption of natural products containing juglone, however, could be beneficial to health if one considers recent reports about the consequences of chronic mild uncoupling.
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Affiliation(s)
- Simoni Cristina Saling
- Department of Biochemistry, Laboratory of Liver Metabolism, University of Maringá, 87020900 Maringá, Brazil
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A theoretical study of the intramolecular proton transfer and calculation of the nucleus independent chemical shift in juglone and some of its derivatives. JOURNAL OF THE SERBIAN CHEMICAL SOCIETY 2011. [DOI: 10.2298/jsc100930080v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
In the present study, first, the intramolecular proton transfer (IPT) process
of juglone and its derivatives were theoretically investigated in the gas
phase and the effect of electron-withdrawing and electronreleasing
substituents in different positions of the phenyl and benzoquinone rings of
juglone on the IPT process was studied in which the geometries, energies and
thermodynamic functions of the compounds were obtained using DFT calculations
at the B3LYP/6-31+G(2d,p) level. Next, the influence of IPT on changing the
aromaticity of the phenyl and benzoquinone rings was investigated. To
determine the aromaticity of the rings, nuclear independent chemical shift
(NICS) values were calculated for the ground state and transition state
structures (GS1,TS,GS2) using the continues set of gauge transformations
(CSGT) procedure at the B3LYP/6-311+G(2d,p) level.
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Klapperstück T, Glanz D, Klapperstück M, Wohlrab J. Methodological aspects of measuring absolute values of membrane potential in human cells by flow cytometry. Cytometry A 2009; 75:593-608. [PMID: 19504578 DOI: 10.1002/cyto.a.20735] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The bis-barbituric acid oxonol, DiBAC(4)(3) is used as a standard potentiometric probe in human cells. However, its fluorescence depends not only on membrane potential but also varies with nonpotential related changes in the amount of intracellular free and bound dye. This study demonstrates the influence of different experimental conditions on this nonspecific fluorescence proportion. IGR1 melanoma cells as a model were specifically altered in cell volume and protein content by depolarizing treatments or cell cycle synchronization. Flow cytometry was performed over a wide range of extracellular DiBAC(4)(3) concentrations. Fixation and increase in protein content led to a nonspecifically enhanced fluorescence, while changes in the amount of free intracellular dye as a result of altered cell volume proved to be negligible. To establish a calibration curve using totally depolarized cells, the pore-forming action of gramicidin should be preferred to fixation. Below 100 nM DiBAC(4)(3), the logarithmic relation between cell fluorescence and dye concentration turned into a virtually linear function intersecting with zero. Consequently, calibration can then be confined to determination of the fluorescence of depolarized cells stained with the same concentration as used for the actual measurement of membrane potential. Unexpectedly, quenching of fluorescence occurred in totally depolarized cells at concentrations higher than 6,250 nM. Linearity and quenching could be confirmed by additional experiments on Chinese hamster ovary CHO-K1 and B lymphoblastoid LCL-HO cells.
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Affiliation(s)
- Thomas Klapperstück
- Department of Dermatology and Venereology, Martin Luther University of Halle-Wittenberg, Saale, Germany.
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Fila C, Metz C, van der Sluijs P. Juglone inactivates cysteine-rich proteins required for progression through mitosis. J Biol Chem 2008; 283:21714-24. [PMID: 18539601 DOI: 10.1074/jbc.m710264200] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The parvulin peptidyl-prolyl isomerase Pin1 catalyzes cis-trans isomerization of p(S/T)-P bonds and might alter conformation and function of client proteins. Since the trans conformation of p(S/T)-P bonds is preferred by protein phosphatase 2A (PP2A), Pin1 may facilitate PP2A-mediated dephosphorylation. Juglone irreversibly inhibits parvulins and is often used to study the function of Pin1 in vivo. The drug prevents dephosphorylation of mitotic phosphoproteins, perhaps because they bind Pin1 and are dephosphorylated by PP2A. We show here however that juglone inhibited post-mitotic dephosphorylation and the exit of mitosis, independent of Pin1. This effect involved covalent modification of sulfhydryl groups in proteins essential for metaphase/anaphase transition. Particularly cytoplasmic proteins with a high cysteine content were vulnerable to the drug. Alkylation of sulfhydryl groups altered the conformation of such proteins, as evidenced by the disappearance of antibody epitopes on tubulin and the mitotic checkpoint component BubR1. The latter activates the anaphase-promoting complex/cyclosome, which degrades regulatory proteins, such as cyclin B1 and securins, and is required for mitotic exit. Indeed, juglone-treated cells failed to assemble a mitotic spindle, which correlated with perturbed microtubule dynamics, loss of immunodetectable tubulin, and formation of tubulin aggregates. Juglone also prevented degradation of cyclin B1, independently of the Mps1-controlled mitotic spindle checkpoint. Since juglone affected cell cycle progression at several levels, more specific drugs need to be developed for studies of Pin1 function in vivo.
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Affiliation(s)
- Claudia Fila
- Department of Cell Biology, University Medical Center Utrecht, Heidelberglaan 100, Utrecht, The Netherlands
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14
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Kong YH, Zhang L, Yang ZY, Han C, Hu LH, Jiang HL, Shen X. Natural product juglone targets three key enzymes from Helicobacter pylori: inhibition assay with crystal structure characterization. Acta Pharmacol Sin 2008; 29:870-6. [PMID: 18565285 PMCID: PMC7091819 DOI: 10.1111/j.1745-7254.2008.00808.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Aim: To investigate the inhibition features of the natural product juglone (5-hydroxy-1,4-naphthoquinone) against the three key enzymes from Helicobacter pylori (cystathionine γ-synthase [HpCGS], malonyl-CoA:acyl carrier protein transacylase [HpFabD], and β-hydroxyacyl-ACP dehydratase [HpFabZ]). Methods: An enzyme inhibition assay against HpCGS was carried out by using a continuous coupled spectrophotometric assay approach. The inhibition assay of HpFabD was performed based on the α-ketoglutarate dehydrogenase-coupled system, while the inhibition assay for HpFabZ was monitored by detecting the decrease in absorbance at 260 nm with crotonoyl-CoA conversion to β-hydroxybutyryl-CoA. The juglone/FabZ complex crystal was obtained by soaking juglone into the HpFabZ crystal, and the X-ray crystal structure of the complex was analyzed by molecular replacement approach. Results: Juglone was shown to potently inhibit HpCGS, HpFabD, and HpFabZ with the half maximal inhibitory concentration IC50 values of 7.0±0.7, 20±1, and 30±4 μmol/L, respectively. An inhibition-type study indicated that juglone was a non-competitive inhibitor of HpCGS against O-succinyl-L-homoserine (Ki=αKi=24 μmol/L), an uncompetitive inhibitor of HpFabD against malonyl-CoA (αKi=7.4 μmol/L), and a competitive inhibitor of HpFabZ against crotonoyl-CoA (Ki=6.8 μmol/L). Moreover, the crystal structure of the HpFabZ/juglone complex further revealed the essential binding pattern of juglone against HpFabZ at the atomic level. Conclusion: HpCGS, HpFabD, and HpFabZ are potential targets of juglone.
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Affiliation(s)
- Yun-hua Kong
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203 China
| | - Liang Zhang
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203 China
| | - Zheng-yi Yang
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203 China
| | - Cong Han
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203 China
| | - Li-hong Hu
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203 China
| | - Hua-liang Jiang
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203 China
| | - Xu Shen
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203 China
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Valla V, Bakola‐Christianopoulou M, Akrivos P, Kojic V, Bogdanovic G. Synthesis, Structure and In vitro Biological Activity of New Hydroxy‐Naphthoquinonato Triorganotin Compounds. ACTA ACUST UNITED AC 2007. [DOI: 10.1080/15533170601028298] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Vasiliki Valla
- a Department of Chemical Engineering , Aristotle University of Thessaloniki , Thessaloniki, Greece
| | | | - Pericles Akrivos
- b Department of Chemistry , Aristotle University of Thessaloniki , Thessaloniki, Greece
| | - Vesna Kojic
- c Experimental Oncology Department , Institute of Oncology , Serbia and Montenegro
| | - Gordana Bogdanovic
- c Experimental Oncology Department , Institute of Oncology , Serbia and Montenegro
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Paulsen MT, Ljungman M. The natural toxin juglone causes degradation of p53 and induces rapid H2AX phosphorylation and cell death in human fibroblasts. Toxicol Appl Pharmacol 2005; 209:1-9. [PMID: 16271620 DOI: 10.1016/j.taap.2005.03.005] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2004] [Revised: 03/04/2005] [Accepted: 03/15/2005] [Indexed: 12/01/2022]
Abstract
Juglone (5-hydroxy-1,4-naphtoquinone) is a natural toxin produced by walnut trees. In this study we show that juglone differentially reduces viability of human cells in culture. Normal fibroblast were found to be especially sensitive to juglone and lost viability primarily through a rapid apoptotic and necrotic response. This response may have been triggered by DNA damage since juglone induced a rapid and strong phosphorylation of H2AX in all phases of the cell cycle. Furthermore, juglone inhibits mRNA synthesis in human fibroblasts in a dose-dependent manner. Surprisingly, juglone caused a drastic reduction of the basal level of p53 in human fibroblasts and this loss could not be fully rescued by proteasome and calpain I inhibitors. However, when cells were pretreated with UV light or ionizing radiation, juglone was not able to reduce the cellular levels of activated p53. Our results show that juglone has multiple effects on cells such as the induction of DNA damage, inhibition of transcription, reduction of p53 protein levels and the induction of cell death.
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Affiliation(s)
- Michelle T Paulsen
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan Medical School, Ann Arbor, MI 48109-0936, USA
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Bazzi MD. Interaction of camel lens zeta-crystallin with quinones: portrait of a substrate by fluorescence spectroscopy. Arch Biochem Biophys 2001; 395:185-90. [PMID: 11697855 DOI: 10.1006/abbi.2001.2538] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Interaction of camel lens zeta-crystallin, an NADPH:quinone oxidoreductase, with several quinone derivatives was examined by fluorescence spectroscopy and activity measurements. Fluorescence of zeta-crystallin was quenched to different levels by the different quinones:juglone (5-OH, 1,4 naphthoquinone), 1,4 naphthoquinone (1,4-NQ), and 1,2 naphthoquinone (1,2-NQ) considerably quenched the fluorescence of zeta-crystallin, where as the commonly used substrate, 9,10-phenanthrenequinone (PQ) did not induce significant quenching. Activity measurements showed only PQ served as a substrate for camel lens zeta-crystallin, while juglone, 1,4-NQ, and 1,2-NQ were inhibitors. Thus quinones that interacted with zeta-crystallin directly inhibited the enzyme, whereas the substrate had very low affinity for the enzyme in the absence of NADPH. Another substrate, dichlorophenol indophenol (DCIP), conformed to the same pattern; DCIP did not quench the fluorescence of the enzyme significantly, but served as a substrate. This pattern is consistent with an ordered mechanism of catalysis with quinone being the second substrate. All three naphthoquinones were uncompetitive inhibitors with respect to NADPH and noncompetitive with respect to PQ. These kinetics are similar to those exhibited by cysteine- and/or lysine-modifying agents. Juglone, 1,4-NQ, and 1,2-NQ interacted with and quenched the fluorescence of camel lens alpha-crystallin, but to lesser extent than that of zeta-crystallin.
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Affiliation(s)
- M D Bazzi
- Department of Biochemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
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Péter M, Hajdu P, Varga Z, Damjanovich S, Possani LD, Panyi G, Gáspár R. Blockage of human T lymphocyte Kv1.3 channels by Pi1, a novel class of scorpion toxin. Biochem Biophys Res Commun 2000; 278:34-7. [PMID: 11071851 DOI: 10.1006/bbrc.2000.3756] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Using the patch-clamp technique we determined that Pandinus imperator toxin Pi1, a recently described peptide toxin having four disulfide bridges instead of the usual three in scorpion toxins, blocked Kv1.3 channels of human T lymphocytes from the extracellular side with a 1:1 stoichiometry. Kv1.3 block was instantaneous and removable with toxin-free extracellular solution. The toxin did not influence activation or inactivation of the channels. We found that Pi1 blocked Kv1.3 with less affinity (K(d) = 11.4 nM) than the structurally related three disulfide bridge containing toxins Pi2 (50 pM) and Pi3 (0.5 nM). The fourth disulfide bridge in Pi1 had no influence on the channel binding ability of the toxin; the less effective block was due to differences in amino acid side chain properties at positions 11 and 35.
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Affiliation(s)
- M Péter
- Department of Biophysics and Cell Biology, Medical and Health Science Center, University of Debrecen, Debrecen, 4012, Hungary
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Duroux L, Delmotte FM, Lancelin JM, Kéravis G, Jay-Allemand C. Insight into naphthoquinone metabolism: beta-glucosidase-catalysed hydrolysis of hydrojuglone beta-D-glucopyranoside. Biochem J 1998; 333 ( Pt 2):275-83. [PMID: 9657966 PMCID: PMC1219583 DOI: 10.1042/bj3330275] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
In plants, the naphthoquinone juglone is known to be involved in pathogenic defence mechanisms, but it may also take part in plant developmental processes. This naphthoquinone can accumulate in a glycosylated form, namely hydrojuglone beta-d-glucopyranoside. The structural configuration of this compound was shown to be 1, 5-dihydroxy-4-naphthalenyl-beta-d-glucopyranoside by means of MS, NMR and nuclear Overhauser effect spectroscopy analyses. A hydrojuglone beta-d-glucopyranoside beta-glucosidase (EC 3.2.1.21) was purified to homogeneity from Juglans regia L. The enzyme catalysed the release of juglone from hydrojuglone beta-d-glucopyranoside with high specificity and showed Michaelis-Menten kinetics with Km=0.62 mM and Vmax=14.5 microkat/mg of protein. This enzyme also showed a higher activity towards beta-d-fucosyl than beta-d-glucosyl bonds. The purified enzyme had an apparent Mr of 64000 by SDS/PAGE and a pI 8.9 by isoelectrofocusing PAGE. The purified enzyme was inhibited by several bivalent cations, such as Cu2+, Fe2+, Hg2+, and by d-glucono-1,5-lactone, showing non-competitive inhibition of the mixed type.
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Affiliation(s)
- L Duroux
- Station d'Amélioration des Arbres Forestiers, I.N.R.A.-Orléans, 45160 Ardon, France
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Péter M, Varga Z, Panyi G, Bene L, Damjanovich S, Pieri C, Possani LD, Gáspár R. Pandinus imperator scorpion venom blocks voltage-gated K+ channels in human lymphocytes. Biochem Biophys Res Commun 1998; 242:621-5. [PMID: 9464266 DOI: 10.1006/bbrc.1997.8018] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Using the patch-clamp technique, we determined that Pandinus imperator scorpion venom blocked whole-cell n-type K+ currents in human peripheral blood lymphocytes in a dose-dependent manner with Kd = 0.02 microgram/ml. K+ channel block was instantaneous and removable by washing with venom-free extracellular solution. The venom-induced block was independent of membrane potential. The venom did not influence activation and inactivation kinetics of the K+ channels, however, accelerated recovery from inactivation. Purified peptides Pi1, Pi2, and Pi3 from the P. imperator venom powerfully blocked Kv1.3 channels in human lymphocytes with Kd values of 9.7 nM, 50 pM, and 0.5 nM, respectively. Flow cytometric membrane potential measurements with the oxonol dye showed that Pi2, the most effective peptide toxin of the P. imperator venom, depolarizes human lymphocytes in accordance with its K+ channel blocking effect.
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Affiliation(s)
- M Péter
- Department of Biophysics and Cell Biology, University Medical School, Debrecen, Hungary
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Chapter 18. T Lymphocyte Potassium Channel Blockers. ANNUAL REPORTS IN MEDICINAL CHEMISTRY 1997. [DOI: 10.1016/s0065-7743(08)61476-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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