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Shmuel O, Rasti A, Zaknoun M, Astman N, Golan-Goldhirsh A, Sagi O, Gopas J. Anti- Leishmania major Properties of Nuphar lutea (Yellow Water Lily) Leaf Extracts and Purified 6,6' Dihydroxythiobinupharidine (DTBN). Pathogens 2024; 13:384. [PMID: 38787236 PMCID: PMC11124111 DOI: 10.3390/pathogens13050384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Revised: 04/30/2024] [Accepted: 05/03/2024] [Indexed: 05/25/2024] Open
Abstract
Cutaneous leishmaniasis (CL) is a zoonotic disease, manifested as chronic ulcers, potentially leaving unattractive scars. There is no preventive vaccination or optimal medication against leishmaniasis. Chemotherapy generally depends upon a small group of compounds, each with its own efficacy, toxicity, and rate of drug resistance. To date, no standardized, simple, safe, and highly effective regimen for treating CL exists. Therefore, there is an urgent need to develop new optimal medication for this disease. Sesquiterpen thio-alkaloids constitute a group of plant secondary metabolites that bear great potential for medicinal uses. The nupharidines found in Nuphar lutea belong to this group of compounds. We have previously published that Nuphar lutea semi-purified extract containing major components of nupharidines has strong anti-leishmanial activity in vitro. Here, we present in vivo data on the therapeutic benefit of the extract against Leishmania major (L. major) in infected mice. We also expanded these observations by establishing the therapeutic effect of the extract-purified nupharidine 6,6'-dihydroxythiobinupharidine (DTBN) in vitro against promastigotes and intracellular amastigotes as well as in vivo in L. major-infected mice. The results suggest that this novel anti-parasitic small molecule has the potential to be further developed against Leishmania.
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Affiliation(s)
- Orit Shmuel
- Shraga Segal Dept. of Microbiology Immunology and Genetics, Faculty of Health Sciences, Ben Gurion University of the Negev, Beer Sheva 8410501, Israel; (O.S.); (A.R.); (O.S.)
| | - Aviv Rasti
- Shraga Segal Dept. of Microbiology Immunology and Genetics, Faculty of Health Sciences, Ben Gurion University of the Negev, Beer Sheva 8410501, Israel; (O.S.); (A.R.); (O.S.)
| | - Melodie Zaknoun
- Department of Clinical Biochemistry & Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva 8410501, Israel;
| | - Nadav Astman
- Department of Dermatology, Sheba Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel-Hashomer, Tel Aviv 39040, Israel;
| | - Avi Golan-Goldhirsh
- The Jacob Blaustein Institutes for Desert Research (BIDR), French Associates Institute for Agriculture and Biotechnology of Drylands, Ben-Gurion University of the Negev, Sede Boqer Campus, Beer Sheva 8410501, Israel;
| | - Orly Sagi
- Shraga Segal Dept. of Microbiology Immunology and Genetics, Faculty of Health Sciences, Ben Gurion University of the Negev, Beer Sheva 8410501, Israel; (O.S.); (A.R.); (O.S.)
- Laboratory of Microbiology, Soroka University Medical Center, Beer Sheva 84101, Israel
| | - Jacob Gopas
- Shraga Segal Dept. of Microbiology Immunology and Genetics, Faculty of Health Sciences, Ben Gurion University of the Negev, Beer Sheva 8410501, Israel; (O.S.); (A.R.); (O.S.)
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Sulaiman M, Jannat K, Nissapatorn V, Rahmatullah M, Paul AK, de Lourdes Pereira M, Rajagopal M, Suleiman M, Butler MS, Break MKB, Weber JF, Wilairatana P, Wiart C. Antibacterial and Antifungal Alkaloids from Asian Angiosperms: Distribution, Mechanisms of Action, Structure-Activity, and Clinical Potentials. Antibiotics (Basel) 2022; 11:antibiotics11091146. [PMID: 36139926 PMCID: PMC9495154 DOI: 10.3390/antibiotics11091146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 08/06/2022] [Accepted: 08/10/2022] [Indexed: 11/16/2022] Open
Abstract
The emergence of multidrug-resistant bacteria and fungi requires the development of antibiotics and antifungal agents. This review identified natural products isolated from Asian angiosperms with antibacterial and/or antifungal activities and analyzed their distribution, molecular weights, solubility, and modes of action. All data in this review were compiled from Google Scholar, PubMed, Science Direct, Web of Science, ChemSpider, PubChem, and a library search from 1979 to 2022. One hundred and forty-one antibacterial and/or antifungal alkaloids were identified during this period, mainly from basal angiosperms. The most active alkaloids are mainly planar, amphiphilic, with a molecular mass between 200 and 400 g/mol, and a polar surface area of about 50 Å2, and target DNA and/or topoisomerase as well as the cytoplasmic membrane. 8-Acetylnorchelerythrine, cryptolepine, 8-hydroxydihydrochelerythrine, 6-methoxydihydrosanguinarine, 2′-nortiliacorinine, pendulamine A and B, rhetsisine, sampangine, tiliacorine, tryptanthrin, tylophorinine, vallesamine, and viroallosecurinine yielded MIC ≤ 1 µg/mL and are candidates for the development of lead molecules.
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Affiliation(s)
- Mazdida Sulaiman
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Khoshnur Jannat
- Department of Biotechnology & Genetic Engineering, University of Development Alternative, Dhaka 1207, Bangladesh
| | - Veeranoot Nissapatorn
- School of Allied Health Sciences and World Union for Herbal Drug Discovery (WUHeDD), Walailak University, Nakhon Si Thammarat 80160, Thailand
| | - Mohammed Rahmatullah
- Department of Biotechnology & Genetic Engineering, University of Development Alternative, Dhaka 1207, Bangladesh
| | - Alok K. Paul
- School of Pharmacy and Pharmacology, University of Tasmania, Hobart, TAS 7001, Australia
| | - Maria de Lourdes Pereira
- CICECO-Aveiro Institute of Materials & Department of Medical Sciences, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Mogana Rajagopal
- Faculty of Pharmaceutical Sciences, UCSI University, Kuala Lumpur 56000, Malaysia
| | - Monica Suleiman
- Institute for Tropical Biology & Conservation, Universiti Malaysia Sabah, Kota Kinabalu 88400, Malaysia
| | | | - Mohammed Khaled Bin Break
- Department of Pharmaceutical Chemistry, College of Pharmacy, University of Hail, Hail 81411, Saudi Arabia
| | - Jean-Frédéric Weber
- UFR Sciences Pharmaceutiques, INRAE, Bordeaux INP, UR ŒNOLOGIE, EA 4577, USC 1366, ISVV, Université de Bordeaux, 210 Chemin de Leysotte, 33882 Villenave d’Ornon, France
| | - Polrat Wilairatana
- Department of Clinical Tropical Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand
| | - Christophe Wiart
- Institute for Tropical Biology & Conservation, Universiti Malaysia Sabah, Kota Kinabalu 88400, Malaysia
- Correspondence:
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Cytotoxicity of Thioalkaloid-Enriched Nuphar lutea Extract and Purified 6,6′-Dihydroxythiobinupharidine in Acute Myeloid Leukemia Cells: The Role of Oxidative Stress and Intracellular Calcium. Pharmaceuticals (Basel) 2022; 15:ph15040410. [PMID: 35455407 PMCID: PMC9032197 DOI: 10.3390/ph15040410] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 03/20/2022] [Accepted: 03/23/2022] [Indexed: 11/17/2022] Open
Abstract
Acute myeloid leukemia (AML) is an aggressive hematological malignancy characterized by uncontrolled proliferation of immature myeloid progenitors. Here, we report the in vitro antileukemic effects of the sesquiterpene thioalkaloid-enriched fraction of the Nuphar lutea leaf extract (NUP) and a purified thioalkaloid 6,6′-dihydroxythiobinupharidine (DTBN). Treatment with 0.3–10 µg/mL NUP caused a dose- and time-dependent reduction in proliferation and viability of human AML cells (KG-1a, HL60 and U937). This was associated with apoptosis induction manifested by annexin-V/propidium iodide binding as well as cleavage of caspases 8, 9, and 3 as well as poly (ADP-ribose) polymerase. Caspase-dependence of the apoptotic effect was confirmed using the pan-caspase inhibitor Q-VD-OPH. NUP induced significant biphasic changes in the cytosolic levels of reactive oxygen species (ROS) compared to untreated cells—a decrease at early time points (2–4 h) and an increase after a longer incubation (24 h). ROS accumulation was accompanied by lowering the cellular glutathione (GSH) levels. In addition, NUP treatment resulted in elevation of the cytosolic Ca2+ (Ca2+cyt) levels. The thiol antioxidant and glutathione precursor N-acetyl cysteine prevented NUP-induced ROS accumulation and markedly inhibited apoptosis. A similar antiapoptotic effect was obtained by Ca2+cyt chelating using BAPTA. These data indicate that NUP-induced cell death is mediated, at least in part, by the induction of oxidative stress and Ca2+cyt accumulation. However, a substantial apoptotic activity of pure DTBN (0.05–0.25 µg/mL), was found to be independent of cytosolic ROS or Ca2+, suggesting that alternative mechanisms are involved in DTBN-induced cytotoxicity. Notably, neither NUP nor DTBN treatment significantly induced cell death of normal human peripheral blood mononuclear cells. Our results provide the basis for further investigation of the antileukemic potential of NUP and its active constituents.
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Inhibition of Cysteine Proteases by 6,6'-Dihydroxythiobinupharidine (DTBN) from Nuphar lutea. Molecules 2021; 26:molecules26164743. [PMID: 34443335 PMCID: PMC8399019 DOI: 10.3390/molecules26164743] [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: 05/21/2021] [Revised: 08/01/2021] [Accepted: 08/03/2021] [Indexed: 11/21/2022] Open
Abstract
The specificity of inhibition by 6,6′-dihydroxythiobinupharidine (DTBN) on cysteine proteases was demonstrated in this work. There were differences in the extent of inhibition, reflecting active site structural-steric and biochemical differences. Cathepsin S (IC50 = 3.2 μM) was most sensitive to inhibition by DTBN compared to Cathepsin B, L and papain (IC50 = 1359.4, 13.2 and 70.4 μM respectively). DTBN is inactive for the inhibition of Mpro of SARS-CoV-2. Docking simulations suggested a mechanism of interaction that was further supported by the biochemical results. In the docking results, it was shown that the cysteine sulphur of Cathepsin S, L and B was in close proximity to the DTBN thiaspirane ring, potentially forming the necessary conditions for a nucleophilic attack to form a disulfide bond. Covalent docking and molecular dynamic simulations were performed to validate disulfide bond formation and to determine the stability of Cathepsins-DTBN complexes, respectively. The lack of reactivity of DTBN against SARS-CoV-2 Mpro was attributed to a mismatch of the binding conformation of DTBN to the catalytic binding site of Mpro. Thus, gradations in reactivity among the tested Cathepsins may be conducive for a mechanism-based search for derivatives of nupharidine against COVID-19. This could be an alternative strategy to the large-scale screening of electrophilic inhibitors.
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Rodrigues L, Tilve SG, Majik MS. Synthetic access to thiolane-based therapeutics and biological activity studies. Eur J Med Chem 2021; 224:113659. [PMID: 34237621 DOI: 10.1016/j.ejmech.2021.113659] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 06/15/2021] [Accepted: 06/16/2021] [Indexed: 12/26/2022]
Abstract
Secondary metabolites isolated from bioactive extracts of natural sources iteratively pioneer the research in drug discovery. Modern medicine is often inspired by bioactive natural products or the bio-functional motifs embedded in them. One of such consequential bio-functional motifs is the thiolane unit. Thiolane-based bioactive organic compounds have manifested a plethora of astonishing biological activities such as anti-viral, anti-cancer, anti-platelet, α-glucosidase inhibition, anti-HIV, immunosuppressive and anti-microbial activities which renders them excellent candidates in drug discovery. Hence, to scale up the accessibility of thiolane-based therapeutics its chemical syntheses is essential and in addition; a sneak peek in its biosynthesis would give a perspective for developing biomimetic syntheses. This review highlights the development of important thiolane-based therapeutics such as (i) Nuphar sesquiterpene thioalkaloids (ii) Thiosugar sulphonium salts from Salacia sp. (iii) Albomycins (iv) Thiolane-based therapeutics from Allium sp. (v) 4'-thionucleosides summarizing various synthetic strategies, biosynthesis and biological activity studies, covering literature till 2021. We anticipate that this review will inspire chemists and biochemists to take up the challenges encountered in the synthesis and development of thiolane-based therapeutics.
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Affiliation(s)
- Lima Rodrigues
- School of Chemical Sciences, Goa University, Taleigao Plateau, Goa, 403 206, India
| | - Santosh G Tilve
- School of Chemical Sciences, Goa University, Taleigao Plateau, Goa, 403 206, India
| | - Mahesh S Majik
- Department of Chemistry, Government College of Arts, Science and Commerce, Khandola Marcela, Goa, 403 107, India; Directorate of Higher Education, Porvorim, Goa 403 521, India.
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Waidha K, Anto NP, Jayaram DR, Golan-Goldhirsh A, Rajendran S, Livneh E, Gopas J. 6,6'-Dihydroxythiobinupharidine (DTBN) Purified from Nuphar lutea Leaves Is an Inhibitor of Protein Kinase C Catalytic Activity. Molecules 2021; 26:molecules26092785. [PMID: 34066895 PMCID: PMC8125885 DOI: 10.3390/molecules26092785] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 05/02/2021] [Accepted: 05/05/2021] [Indexed: 12/28/2022] Open
Abstract
Water lily (Nuphar) bioactive extracts have been widely used in traditional medicine owing to their multiple applications against human ailments. Phyto-active Nuphar extracts and their purified and synthetic derivatives have attracted the attention of ethnobotanists and biochemists. Here, we report that 6,6'-dihydroxythiobinupharidine (DTBN), purified from extracts of Nuphar lutea (L.) Sm. leaves, is an effective inhibitor of the kinase activity of members of the protein kinase C (PKC) family using in vitro and in silico approaches. We demonstrate that members of the conventional subfamily of PKCs, PKCα and PKCγ, were more sensitive to DTBN inhibition as compared to novel or atypical PKCs. Molecular docking analysis demonstrated the interaction of DTBN, with the kinase domain of PKCs depicting the best affinity towards conventional PKCs, in accordance with our in vitro kinase activity data. The current study reveals novel targets for DTBN activity, functioning as an inhibitor for PKCs kinase activity. Thus, this and other data indicate that DTBN modulates key cellular signal transduction pathways relevant to disease biology, including cancer.
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Affiliation(s)
- Kamran Waidha
- Defence Institute of High Altitude Research (DIHAR), Defence Research and Development Organisation (DRDO) Leh, Ladakh UT-194101, India;
| | - Nikhil Ponnoor Anto
- The Shraga Segal Department of Microbiology, Immunology and Genetics Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva 8400501, Israel; (N.P.A.); (D.R.J.)
| | - Divya Ram Jayaram
- The Shraga Segal Department of Microbiology, Immunology and Genetics Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva 8400501, Israel; (N.P.A.); (D.R.J.)
| | - Avi Golan-Goldhirsh
- The Jacob Blaustein Institutes for Desert Research (BIDR), Sede Boqer Campus, French Associates Institute for Agriculture and Biotechnology of Drylands, Ben-Gurion University of the Negev, Beer Sheva 8499000, Israel
- Correspondence: (A.G.-G.); (S.R.); (E.L.); (J.G.)
| | - Saravanakumar Rajendran
- Chemistry Division, Vellore Institute of Technology Chennai Campus, School of Advanced Sciences, Chennai 600127, India
- Correspondence: (A.G.-G.); (S.R.); (E.L.); (J.G.)
| | - Etta Livneh
- The Shraga Segal Department of Microbiology, Immunology and Genetics Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva 8400501, Israel; (N.P.A.); (D.R.J.)
- Correspondence: (A.G.-G.); (S.R.); (E.L.); (J.G.)
| | - Jacob Gopas
- The Shraga Segal Department of Microbiology, Immunology and Genetics Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva 8400501, Israel; (N.P.A.); (D.R.J.)
- Department of Oncology, Soroka University Medical Center, Beer Sheva 8400501, Israel
- Correspondence: (A.G.-G.); (S.R.); (E.L.); (J.G.)
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Nuphar lutea Extracts Exhibit Anti-Viral Activity against the Measles Virus. Molecules 2020; 25:molecules25071657. [PMID: 32260270 PMCID: PMC7180909 DOI: 10.3390/molecules25071657] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Revised: 03/22/2020] [Accepted: 04/02/2020] [Indexed: 02/06/2023] Open
Abstract
Different parts of Nuphar lutea L. (yellow water lily) have been used to treat several inflammatory and pathogen-related diseases. It has shown that Nuphar lutea extracts (NUP) are active against various pathogens including bacteria, fungi, and leishmanial parasites. In an effort to detect novel therapeutic agents against negative-stranded RNA (- RNA) viruses, we have tested the effect of a partially-purified alkaloid mixture of Nuphar lutea leaves on the measles virus (MV). The MV vaccine’s Edmonston strain was used to acutely or persistently infect cells. The levels of several MV proteins were detected by a Western blot and immunocytochemistry. Viral RNAs were quantitated by qRT-PCR. Virus infectivity was monitored by infecting African green monkey kidney VERO cells’ monolayers. We showed that NUP protected cells from acute infection. Decreases in the MV P-, N-, and V-proteins were observed in persistently infected cells and the amount of infective virus released was reduced as compared to untreated cells. By examining viral RNAs, we suggest that NUP acts at the post-transcriptional level. We conclude, as a proof of concept, that NUP has anti-viral therapeutic activity against the MV. Future studies will determine the mechanism of action and the effect of NUP on other related viruses.
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Abstract
This review highlights the progress on the isolation, bioactivity, biogenesis and total synthesis of dimeric sesquiterpenoids since 2010.
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Affiliation(s)
- Lie-Feng Ma
- College of Pharmaceutical Science
- Zhejiang University of Technology
- Hangzhou
- P. R. China
| | - Yi-Li Chen
- College of Pharmaceutical Science
- Zhejiang University of Technology
- Hangzhou
- P. R. China
| | - Wei-Guang Shan
- College of Pharmaceutical Science
- Zhejiang University of Technology
- Hangzhou
- P. R. China
| | - Zha-Jun Zhan
- College of Pharmaceutical Science
- Zhejiang University of Technology
- Hangzhou
- P. R. China
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Matsuda H, Nakamura S, Nakashima S, Fukaya M, Yoshikawa M. Biofunctional Effects of Thiohemiaminal-Type Dimeric Sesquiterpene Alkaloids from Nuphar Plants. Chem Pharm Bull (Tokyo) 2019; 67:666-674. [DOI: 10.1248/cpb.c18-01030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Levy DH, Chapple ILC, Shapira L, Golan-Goldhirsh A, Gopas J, Polak D. Nupharidine enhances Aggregatibacter actinomycetemcomitans clearance by priming neutrophils and augmenting their effector functions. J Clin Periodontol 2018; 46:62-71. [PMID: 30372545 DOI: 10.1111/jcpe.13036] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 09/07/2018] [Accepted: 10/21/2018] [Indexed: 12/26/2022]
Abstract
OBJECTIVES Nupharidine (6,6'-Dihydroxythiobinupharidine), purified from the aquatic plant Nuphar lutea leaves (Water lily) prompts antimicrobial activity of immune cells. The aim of the study was to test the effect of Nupharidine on neutrophil function against Aggregatibacter actinomycetemcomitans, JP2 clone (Aa-JP2). METHODS Neutrophils derived from the human cell line HL60 and human peripheral blood derived from aggressive periodontitis and periodontally healthy subjects were incubated with Nupharidine or vehicle and inoculated with JP2. Bacterial survival was tested using viable counts on blood agar (CFU's). Neutrophils' necrosis/apoptosis, reactive oxygen species (ROS) production, phagocytosis and neutrophil extracellular traps (NET) production following infection were tested, as well as markers of neutrophil priming. RESULTS Nupharidine had no direct bactericidal effect on JP2, but it enhanced Aa-JP2 clearance by neutrophils. Nupharidine enhanced neutrophil phagocytosis, ROS production and NET formation during JP2 infection. Furthermore, Nupharidine enhanced the expression of certain markers of neutrophils priming, specifically iCAM1, DECTIN-2 and intracellular IL-1β. CONCLUSION Nupharidine was shown to promote neutrophil effector bactericidal functions, boosting Aa-JP2 clearance. The results point to the potential of Nupharidine as an adjunctive agent in the treatment of Aa-JP2 periodontitis, but this should be tested initially using pre-clinical and clinical studies.
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Affiliation(s)
- Dan Henry Levy
- Department of Microbiology, Immunology and Genetics, Ben Gurion University of the Negev, Beer Sheva, Israel
| | - Iain L C Chapple
- Periodontal Research Group, Institute of Clinical Sciences, College of Medical and Dental Sciences, School of Dentistry, University of Birmingham, Birmingham Community Health Trust, Birmingham, UK
| | - Lior Shapira
- Department of Periodontology, The Hebrew University-Hadassah Medical Center, Jerusalem, Israel
| | - Avi Golan-Goldhirsh
- The Jacob Blaustein Institutes for Desert Research, Ben Gurion University of the Negev, Beer Sheva, Israel
| | - Jacob Gopas
- Department of Microbiology, Immunology and Genetics, Ben Gurion University of the Negev, Beer Sheva, Israel.,Department of Oncology, Soroka University Medical Center, Beer Sheva, Israel
| | - David Polak
- Department of Periodontology, The Hebrew University-Hadassah Medical Center, Jerusalem, Israel
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Miyachi H, Kuroda T. [Design, Synthesis and Structure-activity Relationship Study of a Series of Bis(bibenzyl)-type Natural Products, Riccardin C Derivatives, as Candidate Anti-MRSA Agents]. YAKUGAKU ZASSHI 2018; 138:1537-1547. [PMID: 30504670 DOI: 10.1248/yakushi.18-00135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We previously showed that a naturally occurring macrocyclic bis(bibenzyl) derivative, riccardin C (RC), exhibits antibacterial activity towards methicillin-resistant Staphylococcus aureus (MRSA), with a potency comparable to that of the clinically used drug vancomycin. Here, we synthesized a series of RC derivatives to explore the structure-activity relationships (SAR). The SAR results clearly indicated that the number and positions of the phenolic hydroxyl groups are primary determinants of the anti-MRSA activity. Pharmacological characterization of the macrocyclic bis(bibenzyl) derivatives, together with fragment compounds and their dimers, indicated that the macrocycles and the fragment compounds elicit anti-MRSA activity with different mechanism(s) of action. The macrocyclic bis(bibenzyl)s are bactericidal, while the fragment compounds are bacteriostatic, showing only weak bactericidal activity. Treatment with a macrocyclic bis(bibenzyl) derivative significantly changed the intracellular Na+ and K+ concentrations of Staphylococcus aureus, and transmission electron microscopy revealed that treated cells developed intracellular lamellar mesosomal-like structures. These results indicated that the macrocyclic compound directly damages the gram-positive bacterial membrane, resulting in increased permeability.
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Affiliation(s)
- Hiroyuki Miyachi
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University
| | - Teruo Kuroda
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University
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Fedotcheva TA, Sheichenko OP, Anufrieva VV, Sheichenko VI, Fedotcheva NI, Shimanovskii NL. Preparation of Nuflein - an Alkaloid from the Yellow Waterlily Nuphar Lutea - and its Cytotoxic Action on Cultures of Normal and Tumorous Human Cells. Pharm Chem J 2017. [DOI: 10.1007/s11094-017-1658-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Lacharity JJ, Fournier J, Lu P, Mailyan AK, Herrmann AT, Zakarian A. Total Synthesis of Unsymmetrically Oxidized Nuphar Thioalkaloids via Copper-Catalyzed Thiolane Assembly. J Am Chem Soc 2017; 139:13272-13275. [PMID: 28911224 PMCID: PMC6309176 DOI: 10.1021/jacs.7b07685] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
An asymmetric total synthesis of (+)-6-hydroxythiobinupharidine (1b) and (-)-6-hydroxythionuphlutine (2b), a set of hemiaminal containing dimeric sesquiterpenes isolated from yellow water lilies of the Nuphar genus, is described. The central bis-spirocyclic tetrahydrothiophene ring was forged through the Stevens rearrangement of a sulfonium ylide, generated in situ from the coupling of a copper-carbene with a spirocyclic thietane. This strategy diverges both from the proposed biosynthesis1 and previous syntheses of this family of alkaloids,2,3 all of which employ dimerization of symmetric monomers to form the aforementioned thiaspirane. The coupling of unsymmetrical monomers allowed access to the unsymmetrically oxidized product 2b for the first time.
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Affiliation(s)
- Jacob J. Lacharity
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | | | | | - Artur K. Mailyan
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | | | - Armen Zakarian
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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Abstract
Drug-resistant bacteria including methicillin-resistant Staphylococcus aureus (MRSA), multidrug-resistant Pseudomonas aeruginosa, and vancomycin-resistant enterococci (VRE) have been spreading; however, the development of new antibacterial drugs has not progressed accordingly. Novel antibacterial drugs or their candidate seeds need to be developed for effective antibiotic therapy. Under these conditions, the search for novel compounds and novel targets is important. In Okayama University, as a part of the Drug Discovery for Intractable Infectious Diseases project, we are proceeding with the development of antibacterial drugs for the treatment of drug-resistant bacterial infections. We found that riccardin C (a natural product of liverwort) and 6,6'-dihydroxythiobinupharidine (from the crude drug Senkotsu) exhibited strong antibacterial activities, particularly against Gram-positive bacteria. We showed that riccardin C induced cell membrane leakage and that 6,6'-dihydroxythiobinupharidine inhibited DNA topoisomerase IV. Moreover, 6,6'-dihydroxythiobinupharidine exerted synergistic effects with already known anti-MRSA drugs as well as with vancomycin for VRE.
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Affiliation(s)
- Teruo Kuroda
- Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University
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Shimozu Y, Kimura Y, Esumi A, Aoyama H, Kuroda T, Sakagami H, Hatano T. Ellagitannins of Davidia involucrata. I. Structure of Davicratinic Acid A and Effects of Davidia Tannins on Drug-Resistant Bacteria and Human Oral Squamous Cell Carcinomas. Molecules 2017; 22:E470. [PMID: 28294988 PMCID: PMC6155176 DOI: 10.3390/molecules22030470] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2017] [Revised: 03/05/2017] [Accepted: 03/12/2017] [Indexed: 11/25/2022] Open
Abstract
We isolated a new ellagitannin, davicratinic acid A (5), together with four known ellagitannins, davidiin (1), granatin A (2), pedunculagin (3), and 3-O-galloylgranatin A (4), from an aqueous acetone extract of dried Davidia involucrata leaves. The known ellagitannins were identified based on spectroscopic data. The structure of davicratinic acid A (5), a monomeric ellagitannin possessing a unique, skew-boat glucopyranose core, was established based on spectroscopic data. Additionally, we examined the effects of several tannins with good yields from this plant on drug-resistant bacteria and human oral squamous cell carcinomas, and found that davidiin (1) exhibited the most potent antibacterial and antitumor properties among the tannins examined.
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Affiliation(s)
- Yuuki Shimozu
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700-8530, Japan.
| | - Yuriko Kimura
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700-8530, Japan.
| | - Akari Esumi
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700-8530, Japan.
| | - Hiroe Aoyama
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700-8530, Japan.
| | - Teruo Kuroda
- Department of Molecular Microbiology and Biotechnology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima 734-8553, Japan.
| | - Hiroshi Sakagami
- Division of Pharmacology, Department of Diagnostic and Therapeutic Sciences, School of Dentistry, Meikai University, Saitama 350-0283, Japan.
| | - Tsutomu Hatano
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700-8530, Japan.
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Li H, Cooke TJ, Korotkov A, Chapman CW, Eastman A, Wu J. Stereoselective Synthesis and Biological Evaluation of C1-Epimeric and Desmethyl Monomeric Nuphar Analogues. J Org Chem 2017; 82:2648-2655. [DOI: 10.1021/acs.joc.6b03052] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Hui Li
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Timothy J. Cooke
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Alexander Korotkov
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Charles W. Chapman
- Molecular
and Systems Biology, Geisel School of Medicine, Lebanon, New Hampshire 03756, United States
| | - Alan Eastman
- Molecular
and Systems Biology, Geisel School of Medicine, Lebanon, New Hampshire 03756, United States
| | - Jimmy Wu
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States
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Tada N, Jansen D, Mower MP, Blewett MM, Umotoy JC, Cravatt B, Wolan DW, Shenvi RA. Synthesis and Sulfur Electrophilicity of the Nuphar Thiaspirane Pharmacophore. ACS CENTRAL SCIENCE 2016; 2:401-408. [PMID: 27413784 PMCID: PMC4919772 DOI: 10.1021/acscentsci.6b00113] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Indexed: 06/06/2023]
Abstract
We describe a general method to synthesize the iminium tetrahydrothiophene embedded in the dimeric Nuphar alkaloids. In contrast to prior studies, the sulfur atom of the thiaspirane pharmacophore is shown to be electrophilic. This α-thioether reacts with thiophenol or glutathione at ambient temperature to cleave the C-S bond and form a disulfide. Rates of conversion are proportional to the corresponding ammonium ion pK a and exhibit half-lives less than 5 h at a 5 mM concentration of thiol. A simple thiophane analogue of the Nuphar dimers causes apoptosis at single-digit micromolar concentration and labels reactive cysteines at similar levels as the unsaturated iminium "warhead". Our experiments combined with prior observations suggest the sulfur of the Nuphar dimers can react as an electrophile in cellular environments and that sulfur-triggered retrodimerization can occur in the cell.
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Li H, Korotkov A, Chapman CW, Eastman A, Wu J. Enantioselective Formal Syntheses of 11 Nuphar Alkaloids and Discovery of Potent Apoptotic Monomeric Analogues. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hui Li
- Department of Chemistry; Dartmouth College; Hanover NH 03755 USA
| | | | - Charles W. Chapman
- Department of Pharmacology and Toxicology; Geisel School of Medicine; Lebanon NH 03756 USA
| | - Alan Eastman
- Department of Pharmacology and Toxicology; Geisel School of Medicine; Lebanon NH 03756 USA
| | - Jimmy Wu
- Department of Chemistry; Dartmouth College; Hanover NH 03755 USA
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Li H, Korotkov A, Chapman CW, Eastman A, Wu J. Enantioselective Formal Syntheses of 11 Nuphar Alkaloids and Discovery of Potent Apoptotic Monomeric Analogues. Angew Chem Int Ed Engl 2016; 55:3509-13. [DOI: 10.1002/anie.201600106] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 01/14/2016] [Indexed: 12/21/2022]
Affiliation(s)
- Hui Li
- Department of Chemistry; Dartmouth College; Hanover NH 03755 USA
| | | | - Charles W. Chapman
- Department of Pharmacology and Toxicology; Geisel School of Medicine; Lebanon NH 03756 USA
| | - Alan Eastman
- Department of Pharmacology and Toxicology; Geisel School of Medicine; Lebanon NH 03756 USA
| | - Jimmy Wu
- Department of Chemistry; Dartmouth College; Hanover NH 03755 USA
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20
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Korotkov A, Li H, Chapman CW, Xue H, MacMillan JB, Eastman A, Wu J. Total Syntheses and Biological Evaluation of Both Enantiomers of Several Hydroxylated Dimeric Nuphar Alkaloids. Angew Chem Int Ed Engl 2015. [PMID: 26205039 DOI: 10.1002/anie.201503934] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Herein, we describe the first total syntheses of five members of the dimeric nuphar alkaloids: (+)-6,6'-dihydroxythiobinupharidine (+)-1 a, (+)-6-hydroxythiobinupharidine (+)-1 b, (-)-6,6'-dihydroxythionuphlutine (-)-2 a, (-)-6,6'-dihydroxyneothiobinupharidine (-)-3 a, and (+)-6,6'-dihydroxyneothionuphlutine (+)-4 a. The latter two have not been found in nature. We have also made each of their enantiomers (-)-1 a-b, (+)-2 a, (+)-3 a, and (-)-4 a. The key step in these syntheses was the dimerization of an α-aminonitrile (a hydrolytically stable surrogate for its corresponding hemiaminal) with chiral Lewis acid complexes. We have also reassigned the literature structures of (+)-1 a-1 b—for those instances in which the NMR spectra were obtained in CD3OD—to their corresponding CD3O-adducts. Our efforts provide for the first time apoptosis data for (-)-3 a, (+)-4 a, and all five non-natural enantiomers prepared. The data indicate high apoptotic activity regardless of the enantiomer or relative stereochemical configuration at C7 and C7'.
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Affiliation(s)
- Alexander Korotkov
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755 (United States)
| | - Hui Li
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755 (United States)
| | - Charles W Chapman
- Department of Pharmacology and Toxicology, Geisel School of Medicine, Lebanon, New Hampshire 03756 (United States)
| | - Haoran Xue
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755 (United States).,Natural Products LINCHPIN Laboratory, Texas A&M University, College Station, Texas, 77840 (United States)
| | - John B MacMillan
- Department of Biochemistry, UT Southwestern Medical Center, Dallas, Texas, 75390 (United States).
| | - Alan Eastman
- Department of Pharmacology and Toxicology, Geisel School of Medicine, Lebanon, New Hampshire 03756 (United States).
| | - Jimmy Wu
- Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755 (United States).
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Korotkov A, Li H, Chapman CW, Xue H, MacMillan JB, Eastman A, Wu J. Total Syntheses and Biological Evaluation of Both Enantiomers of Several Hydroxylated Dimeric Nuphar Alkaloids. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503934] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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