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Mehjabin JJ, Phan CS, Okino T. Noducyclamides A1-A4, B1, and B2 from the Cyanobacterium Nodularia sp. NIES-3585. J Nat Prod 2024. [PMID: 38587271 DOI: 10.1021/acs.jnatprod.3c01272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
A chemical investigation of the hydrophilic fraction of a cultured Nodularia sp. (NIES-3585) afforded six new cyclic lipopeptides, noducyclamides A1-A4 (1-4) containing 10 amino acid residues and dodecapeptides noducyclamides B1 and B2 (5 and 6). The planar structures of these lipopeptides were elucidated based on the combination of HRMS and 1D and 2D NMR spectroscopic data analyses. These peptides are structurally analogous to laxaphycins and contain the nonproteinogenic amino acids 3-hydroxyvaline and 3-hydroxyleucine and a β-amino decanoic acid residue. The absolute configurations of the noducyclamides (1-6) were determined by acid hydrolysis, followed by advanced Marfey's analysis. Noducyclamide B1 (5) showed cytotoxic activities against MCF7 breast cancer cell lines with an IC50 value of 3.0 μg/mL (2.2 μM).
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Hossain MS, Okino T. Cyanoremediation of heavy metals (As(v), Cd(ii), Cr(vi), Pb(ii)) by live cyanobacteria ( Anabaena variabilis, and Synechocystis sp.): an eco-sustainable technology. RSC Adv 2024; 14:10452-10463. [PMID: 38567320 PMCID: PMC10986677 DOI: 10.1039/d4ra00409d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 03/16/2024] [Indexed: 04/04/2024] Open
Abstract
The cyanoremediation technique for heavy metal (HM) removal from wastewater using live cyanobacteria is promising to reduce the pollution risk both for the environment and human health. In this study, two widely recognized freshwater cyanobacteria, Anabaena variabilis and Synechocystis sp., were used to explore their efficacy in HM (As(v), Cd(ii), Cr(vi), Pb(ii)) removal. The different optimum adsorption conditions were pH 8 and 7.5 for A. variabilis and Synechocystis sp., respectively, but the temperature (25 °C) and contact time (48 hours) were the same for both strains. Under these specified conditions, A. variabilis exhibited the capability to remove 25% of As(v), 78% of Cd(ii), 54% of Cr(vi), and 17% of Pb(ii), whereas Synechocystis sp. removed 77% of As(v), 57% of Cd(ii), 91% of Cr(vi), and 77% of Pb(ii) at different initial concentrations. Metal diversity interfered negatively with cyanobacterial growth, especially Cd(ii) and As(v), as measured by OD730, dry biomass, chlorophyll a, and carotenoid production for both strains. Fourier transform infrared spectrum (FT-IR) analysis revealed the existence of diverse surface binding sites for HM adsorption, stemming from proteins and polysaccharides. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) confirmed the presence of HMs on the surface of the cyanobacterial cells. Finally, the zeta potential results indicating alterations in the surface negative charges elucidated the adsorption mechanisms involved in the HM removal by both cyanobacteria. These results provided a comprehensive understanding of the HM adsorption mechanism by cyanobacteria, offering valuable theoretical insights that can be extrapolated to enhance our comprehension of the cyanoremediation mechanisms by various other cyanobacterial strains.
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Affiliation(s)
- Md Sabbir Hossain
- Graduate School of Environmental Science, Hokkaido University Sapporo 060-0810 Japan
- Department of Environmental Science and Technology, Jashore University of Science and Technology Jashore-7408 Bangladesh
| | - Tatsufumi Okino
- Graduate School of Environmental Science, Hokkaido University Sapporo 060-0810 Japan
- Faculty of Environmental Earth Science, Hokkaido University Sapporo 060-0810 Japan
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Okino T. [Up to Date of Cyanobacterial Natural Products]. YAKUGAKU ZASSHI 2024; 144:27-32. [PMID: 38171790 DOI: 10.1248/yakushi.23-00161-2] [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] [Indexed: 01/05/2024]
Abstract
More than 2000 compounds have been reported from cyanobacteria. The most successful example is dolastatin 10, of which a related compound monomethylauristatin E is used as antibody-drug conjugate (ADC) for Hodgkin lymphoma and systemic anaplastic large cell lymphoma. Recently genome-based analyses by Piel led to the discovery of novel compounds from cyanobacteria. W. H. Gerwick found a potential as anti-SARS-CoV-2 agent in gallinamide A, which was reported as a cathepsin L inhibitor. In our group columbamides were isolated from the marine cyanobacterium Moorena bouillonii. The geometry of the double bond was determined by the coupling constant obtained using non-decoupled heteronuclear single quantum coherence (HSQC). The configuration of chloromethine in a long-chain acyl moiety was determined by the Ohrui method at room temperature using a chiral HPLC column. Columbamide D showed biosurfactant activity. One strain many compounds (OSMAC) is a method to discover new compounds by changing culture conditions. Prior to our experiments, attempts to apply OSMAC in cyanobacteria resulted in the induction or up-regulation of only known compounds. The heat shock culture of the freshwater cyanobacterium Microcystis aeruginosa up-regulated a ribosomal peptide argicyclamide C. At the same time, we discovered bis-prenylated and monoprenylated argicyclamides A and B. More recently iron-limited culture produced hydroxylated argicyclamide A. OSMAC and genome-based screening could lead the discovery of unique biologically active compounds from cyanobacteria.
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Umezawa T, Maeda T, Akiyama T, Prakoso NI, Mehjabin JJ, Okino T, Matsuda F. Syntheses and Biological Activities of Danicalipin A Derivatives. Chem Biodivers 2023:e202300400. [PMID: 37073090 DOI: 10.1002/cbdv.202300400] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 04/18/2023] [Accepted: 04/18/2023] [Indexed: 04/20/2023]
Abstract
Synthesis of three derivatives of danicalipin A, tetrachloride, trisulfate and a fluorescent probe was achieved through Wittig reaction strategy. Toxicity of the derivatives against brine shrimp (Artemia salina) as also investigated to provide useful information for the biological activity; i) less chloride derivative showed similar toxicity to danicalipin A, ii) the amphiphilic property, a characteristic feature of danicalipin A, was crucial because trisulfate considerably decreased the toxicity and iii) fluorescent derivative kept brine shrimp toxicity of danicalipin A.
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Affiliation(s)
- Taiki Umezawa
- Hokkaido University, Faculty of Environmental Earth Science, N10W5, 060-0810, Sapporo, JAPAN
| | - Takeshi Maeda
- Hokkaido University: Hokkaido Daigaku, Graduate School of Environmental Science, N10W5, Sapporo kita-ku, JAPAN
| | - Takuya Akiyama
- Hokkaido University: Hokkaido Daigaku, Graduate School of Environmental Science, N10W5, Sapporo kita-ku, JAPAN
| | - Nurcahyo Iman Prakoso
- Islamic University of Indonesia: Universitas Islam Indonesia, Faculty of Mathematics and Natural Sciences, Jl. Kaliurang KM 14,5, Sleman, INDONESIA
| | - Jakia Jerin Mehjabin
- Hokkaido University: Hokkaido Daigaku, Graduate School of Environmental Science, N10W5, Sapporo kita-ku, JAPAN
| | - Tatsufumi Okino
- Hokkaido University: Hokkaido Daigaku, Graduate School of Environmental Science, N10W5, Sapporo kita-ku, JAPAN
| | - Fuyuhiko Matsuda
- Hokkaido University: Hokkaido Daigaku, Graduate School of Environmental Science, N10W5, Sapporo kita-ku, JAPAN
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Phan CS, Mehjabin JJ, Anas ARJ, Hayasaka M, Onoki R, Wang J, Umezawa T, Washio K, Morikawa M, Okino T. Nostosin G and Spiroidesin B from the Cyanobacterium Dolichospermum sp. NIES-1697. J Nat Prod 2022; 85:2000-2005. [PMID: 35948062 DOI: 10.1021/acs.jnatprod.2c00382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Chemical investigation of the cyanobacterium Dolichospermum sp. NIES-1697 afforded nostosin G (1), a linear tripeptide, spiroidesin B (2), and two known compounds, anabaenopeptins I (3) and J (4). Planar structures and absolute configurations for 1 and 2 were determined by 2D NMR, HRMS, Marfey's methodology, chiral-phase HPLC, and enzymatic degradation. Nostosin G (1) is a unique example of a linear peptide containing three subunits, 4-hydroxyphenyllactic acid (Hpla), homotyrosine (Hty), and argininal, with potent trypsin inhibitory properties. The biosynthetic gene clusters for nostosin G (1) and spiroidesin B (2) were investigated based on the genome sequence of Dolichospermum sp. NIES-1697.
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Okino T, Ou Y, Ikebe M, Furusaki A, Sagawa A, Kato M, Atsumi T, Kamishima T. AB1330 AUTOMATIC SUBPIXEL MEASUREMENT OF RADIOGRAPHIC FINGER JOINT SPACE NARROWING IN RHEUMATOID ARTHRITIS PATIENTS UNDER TOCILIZUMAB TREATMENT. Ann Rheum Dis 2022. [DOI: 10.1136/annrheumdis-2022-eular.276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BackgroundThe conventional scoring methods of radiographic joint space narrowing (JSN) in rheumatoid arthritis (RA) such as the Genant-modified Sharp score (GSS) are widely accepted but include subjective and time-consuming nature1. Therefore, we have developed an in-house software equipped with partial image phase-only correlation (PIPOC)2 which can automatically quantify joint space width (JSW) change.ObjectivesThe purpose of this study was to investigate whether the in-house software can predict the inhibitory effect of tocilizumab on joint destruction in a short period of time.MethodsThe study included 39 RA patients (35 female) who were treated with tocilizumab (Table 1). Radiological progression of the metacarpophalangeal and the proximal interphalangeal joints was evaluated according to the GSS at 0, 6, and 12 months. Automatic measurement was performed by the in-house software (Figure 1). We then validated in-house software in terms of accuracy in detecting the JSN.Figure 1.The algorithm flow of in-house software equipped with PIPOCTable 1.Clinical characteristics of RA patientsvariablebaseline6 months12 monthsTotal number of patients39Sex, female/male35/4Rheumatoid factor status, positive/negative29/10Age, mean (SD) years61.5 (14.6)Duration of disease, mean (SD) months111.4 (85.0)Swollen joint count, mean (SD)6.0 (4.7)3.5 (3.5)2.9 (4.0)Tender joint count, mean (SD)6.4 (3.5)2.9 (2.2)1.9 (2.0)DAS28-ESR, mean (SD)4.9 (1.2)3.0 (1.1)2.6 (1.0)DAS28-CRP, mean (SD)4.4 (1.1)3.0 (0.9)2.6 (0.8)RA, rheumatoid arthritis; SD, standard deviation; DAS28, disease activity score with 28 joints; ESR, erythrocyte sedimentation rate; CRP, C-reactive proteinResultsTo ensure homogeneity of the subjects, we targeted the joints with GSS = 0 at baseline in the software analysis. The success rate of the in-house software for JSW measurement was 96.8% (449/464). Here, the GSS (+)/PIPOC (+) were defined as joints with JSN progression according to the GSS and the software analysis, respectively. Otherwise, joints were defined as the GSS (-)/PIPOC (-) namely non-progressive JSN. The 0–12-month GSS with the 0–6-month GSS (+) group was significantly more JSN progression than the 0–6-month GSS (-) group (Mann-Whitney U test, p < 0.001). Similarly, the 0–12-month PIPOC with the 0–6-month PIPOC (+) group was significantly more JSN progression than the 0–6-month PIPOC (-) group (p < 0.001). The 0–12-month JSW change of finger joints with the 0–12-month GSS (+) detected by the in-house software was significantly greater than the 0–12-month GSS (-) (p = 0.02).ConclusionOur in-house software equipped with PIPOC might be able to predict the subsequent joint destruction with 6 months observations.References[1]Genant HK, et al: Assessment of rheumatoid arthritis using a modified scoring method on digitized and original radiographs. Arthritis & Rheumatism: Official Journal of the American College of Rheumatology 1998, 41(9):1583-1590.[2]Ou Y, et al: Automatic Radiographic Quantification of Joint Space Narrowing Progression in Rheumatoid Arthritis Using POC. In: 2019 IEEE 16th International Symposium on Biomedical Imaging (ISBI 2019). 2019: 1183-1187.Disclosure of InterestsTaichi Okino: None declared, Yafei Ou: None declared, Masayuki Ikebe: None declared, Akira Furusaki: None declared, Akira Sagawa: None declared, Masaru Kato: None declared, Tatsuya Atsumi: None declared, Tamotsu Kamishima Grant/research support from: Tamotsu Kamishima reports grants from Chugai Pharmaceutical.
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Phan CS, Matsuda K, Balloo N, Fujita K, Wakimoto T, Okino T. Argicyclamides A-C Unveil Enzymatic Basis for Guanidine Bis-prenylation. J Am Chem Soc 2021; 143:10083-10087. [PMID: 34181406 DOI: 10.1021/jacs.1c05732] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Guanidine prenylation is an outstanding modification in alkaloid and peptide biosynthesis, but its enzymatic basis has remained elusive. We report the isolation of argicyclamides, a new class of cyanobactins with unique mono- and bis-prenylations on guanidine moieties, from Microcystis aeruginosa NIES-88. The genetic basis of argicyclamide biosynthesis was established by the heterologous expression and in vitro characterization of biosynthetic enzymes including AgcF, a new guanidine prenyltransferase. This study provides important insight into the biosynthesis of prenylated guanidines and offers a new toolkit for peptide modification.
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Affiliation(s)
| | - Kenichi Matsuda
- Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan.,Global Station for Biosurfaces and Drug Discovery, Hokkaido University, Kita 12, Nishi 6, Sapporo 060-0812, Japan
| | | | - Kei Fujita
- Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
| | - Toshiyuki Wakimoto
- Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan.,Global Station for Biosurfaces and Drug Discovery, Hokkaido University, Kita 12, Nishi 6, Sapporo 060-0812, Japan
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Mehjabin JJ, Wei L, Petitbois JG, Umezawa T, Matsuda F, Vairappan CS, Morikawa M, Okino T. Biosurfactants from Marine Cyanobacteria Collected in Sabah, Malaysia. J Nat Prod 2020; 83:1925-1930. [PMID: 32432877 DOI: 10.1021/acs.jnatprod.0c00164] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Chemical investigation of the organic extract from Moorea bouillonii, collected in Sabah, Malaysia, led to the isolation of three new chlorinated fatty acid amides, columbamides F (1), G (2), and H (3). The planar structures of 1-3 were established by a combination of mass spectrometric and NMR spectroscopic analyses. The absolute configuration of 1 was determined by Marfey's analysis of its hydrolysate and chiral-phase HPLC analysis after conversion and esterification with Ohrui's acid, (1S,2S)-2-(anthracene-2,3-dicarboximido)cyclohexanecarboxylic acid. Compound 1 showed biosurfactant activity by an oil displacement assay. Related known fatty acid amides columbamide D and serinolamide C exhibited biosurfactant activity with critical micelle concentrations of about 0.34 and 0.78 mM, respectively.
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Affiliation(s)
| | | | | | | | | | - Charles S Vairappan
- Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, Kota Kinabalu 88450, Sabah, Malaysia
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Hoshino M, Okino T, Kogame K. Parthenogenetic female populations in the brown alga Scytosiphon lomentaria (Scytosiphonaceae, Ectocarpales): decay of a sexual trait and acquisition of asexual traits. J Phycol 2019; 55:204-213. [PMID: 30411801 DOI: 10.1111/jpy.12812] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2018] [Accepted: 10/20/2018] [Indexed: 06/08/2023]
Abstract
In isogamous brown algae, the sexuality of populations needs to be tested by laboratory crossing experiments, as the sexes of gametophytes are morphologically indistinguishable. In some cases, gamete fusion is not observed and the precise reproductive mode of the populations is unknown. In the isogamous brown alga Scytosiphon lomentaria in Japan, both asexual (gamete fusion is unobservable) and sexual populations (gamete fusion is observable) have been reported. In order to elucidate the reproductive mode of asexual populations in this species, we used PCR-based sex markers to investigate the sex ratio of three asexual and two sexual field populations. The markers indicated that the asexual populations consisted only of female individuals, whereas sexual populations are composed of both males and females. In culture, female gametes of most strains from asexual populations were able to fuse with male gametes; however, they had little to no detectable sexual pheromones, significantly larger cell sizes, and more rapid parthenogenetic development compared to female/male gametes from sexual populations. Investigations of sporophytic stages in the field indicated that alternation of gametophytic and parthenosporophytic stages occur in an asexual population. These results indicate that the S. lomentaria asexual populations are female populations that lack sexual reproduction and reproduce parthenogenetically. It is likely that females in the asexual populations have reduced a sexual trait (pheromone production) and have acquired asexual traits (larger gamete sizes and rapid parthenogenetic development).
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Affiliation(s)
- Masakazu Hoshino
- Department of Natural History Sciences, Graduate School of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Tatsufumi Okino
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Kazuhiro Kogame
- Department of Biological Sciences, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
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Umezawa T, Prakoso NI, Kannaka M, Nogata Y, Yoshimura E, Okino T, Matsuda F. Synthesis and Structure-Activity Relationship of Omaezallene Derivatives. Chem Biodivers 2018; 16:e1800451. [PMID: 30394674 DOI: 10.1002/cbdv.201800451] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 11/05/2018] [Indexed: 11/12/2022]
Abstract
Omaezallene derivatives (nor-bromoallene, nor-bromodiene, and bromoenynes) were successfully synthesized. Their antifouling activity and toxicity to the cypris larvae of the barnacle Amphibalanus amphitrite and ecotoxicity to the marine crustacean Tigriopus japonicus were studied. It was revealed that the two side chains of omaezallene were essential to its antifouling activity because the activities of nor-bromoallene and nor-bromodiene were significantly diminished. The bromoenyne was found to exhibit potent antifouling activities comparable to omaezallene with low toxicity and ecotoxicity. Preparation of bromoenyne framework is much easier than that of bromodiene moiety in omaezallene. Based on the antifouling activities of the bromoenynes, the synthesis of fluorescent probes and evaluation of their biological activities were also carried out.
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Affiliation(s)
- Taiki Umezawa
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, N10 W5, Sapporo, 060-0810, Japan
| | - Nurcahyo Iman Prakoso
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, N10 W5, Sapporo, 060-0810, Japan.,Chemistry Department, Universitas Islam Indonesia, Kaliurang KM 14, 5, Sleman Yogyakarta, Indonesia
| | - Miho Kannaka
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, N10 W5, Sapporo, 060-0810, Japan
| | - Yasuyuki Nogata
- Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba, 270-1194, Japan
| | | | - Tatsufumi Okino
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, N10 W5, Sapporo, 060-0810, Japan
| | - Fuyuhiko Matsuda
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, N10 W5, Sapporo, 060-0810, Japan
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Kumagai M, Nishikawa K, Matsuura H, Umezawa T, Matsuda F, Okino T. Antioxidants from the Brown Alga Dictyopteris undulata. Molecules 2018; 23:E1214. [PMID: 29783698 PMCID: PMC6099395 DOI: 10.3390/molecules23051214] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Revised: 05/15/2018] [Accepted: 05/16/2018] [Indexed: 12/22/2022] Open
Abstract
An investigation of anti-oxidative compounds from the brown alga Dictyopteris undulata has led to the isolation and identification of isozonarol, isozonarone, chromazonarol, zonaroic acid and isozonaroic acid. Their structures were identified by comparison of MS and NMR spectra. Full NMR assignment and absolute configuration of isozonaroic acid are described. Isozonarol showed the most potent 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity among the compounds isolated.
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Affiliation(s)
- Momochika Kumagai
- Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan.
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan.
- Japan Food Research Laboratories, Ibaraki, Osaka 567-0085, Japan.
| | - Keisuke Nishikawa
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan.
| | - Hiroshi Matsuura
- National Institute of Technology, Asahikawa College, Asahikawa 071-8142, Japan.
| | - Taiki Umezawa
- Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan.
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan.
| | - Fuyuhiko Matsuda
- Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan.
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan.
| | - Tatsufumi Okino
- Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan.
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan.
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Casalme LO, Yamauchi A, Sato A, Petitbois JG, Nogata Y, Yoshimura E, Okino T, Umezawa T, Matsuda F. Total synthesis and biological activity of dolastatin 16. Org Biomol Chem 2018; 15:1140-1150. [PMID: 28074955 DOI: 10.1039/c6ob02657e] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The total synthesis of dolastatin 16, a macrocyclic depsipeptide first isolated from the sea hare Dolabella auricularia as a potential antineoplastic metabolite by Pettit et al., was achieved in a convergent manner. Dolastatin 16 was reported by Tan to exhibit strong antifouling activity, and thus shows promise for inhibiting the attachment of marine benthic organisms such as Amphibalanus amphitrite to ships and submerged artificial structures. Therefore, dolastatin 16 is a potential compound for a new, environmentally friendly antifouling material to replace banned tributyltin-based antifouling paints. The synthesis of dolastatin 16 involved the use of prolinol to prevent formation of a diketopiperazine composed of l-proline and N-methyl-d-valine during peptide coupling. This strategy for the elongation of peptide chains allowed the efficient and scalable synthesis of one segment, which was subsequently coupled with a second segment and cyclized to form the macrocyclic framework of dolastatin 16. The synthetic dolastatin 16 exhibited potent antifouling activity similar to that of natural dolastatin 16 toward cypris larvae of Amphibalanus amphitrite.
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Affiliation(s)
- Loida O Casalme
- Graduate School of Environmental Science, Hokkaido University, N10W5 Sapporo 060-0810, Japan.
| | - Arisa Yamauchi
- Graduate School of Environmental Science, Hokkaido University, N10W5 Sapporo 060-0810, Japan.
| | - Akinori Sato
- Graduate School of Environmental Science, Hokkaido University, N10W5 Sapporo 060-0810, Japan.
| | - Julie G Petitbois
- Graduate School of Environmental Science, Hokkaido University, N10W5 Sapporo 060-0810, Japan.
| | - Yasuyuki Nogata
- Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba 270-1194, Japan
| | | | - Tatsufumi Okino
- Graduate School of Environmental Science, Hokkaido University, N10W5 Sapporo 060-0810, Japan.
| | - Taiki Umezawa
- Graduate School of Environmental Science, Hokkaido University, N10W5 Sapporo 060-0810, Japan.
| | - Fuyuhiko Matsuda
- Graduate School of Environmental Science, Hokkaido University, N10W5 Sapporo 060-0810, Japan.
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Petitbois JG, Casalme LO, Lopez JAV, Alarif WM, Abdel-Lateff A, Al-Lihaibi SS, Yoshimura E, Nogata Y, Umezawa T, Matsuda F, Okino T. Serinolamides and Lyngbyabellins from an Okeania sp. Cyanobacterium Collected from the Red Sea. J Nat Prod 2017; 80:2708-2715. [PMID: 29019684 DOI: 10.1021/acs.jnatprod.7b00449] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
NMR- and MS-guided fractionation of an extract of an Okeania sp. marine cyanobacterium, collected from the Red Sea, led to the isolation of four new metabolites, including serinolamides C (1) and D (2) and lyngbyabellins O (3) and P (4), together with the three known substances lyngbyabellins F (5) and G (6) and dolastatin 16 (7). The planar structures of the new compounds were determined using NMR and MS analyses. The absolute configurations of 1 and 2 were determined by Marfey's analysis of their hydrolysates. The absolute configuration of 3 was ascertained by chiral-phase chromatography of degradation products, while that of 4 was determined by comparison to 3 and 5. The cytotoxic and antifouling activities of these compounds were evaluated using MCF7 breast cancer cells and Amphibalanus amphitrite larvae, respectively. Compounds 3, 4, and 7 exhibited strong antifouling activity, and 3 and 7 were not cytotoxic. A structure-activity relationship was observed for the cytotoxicity of the lyngbyabellins with the presence of a side chain (4 is more active than 3) leading to greater activity. For the antifouling activity, the acyclic form without a side chain (3) was the most active.
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Affiliation(s)
| | | | | | - Walied M Alarif
- Department of Marine Chemistry, Faculty of Marine Sciences, King Abdulaziz University , P.O. Box 80207, Jeddah 21589, Saudi Arabia
| | - Ahmed Abdel-Lateff
- Department of Natural Products and Alternative Medicine, Faculty of Pharmacy, King Abdulaziz University , P.O. Box 80260, Jeddah 21589, Saudi Arabia
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University , Minia 61519, Egypt
| | - Sultan S Al-Lihaibi
- Department of Marine Chemistry, Faculty of Marine Sciences, King Abdulaziz University , P.O. Box 80207, Jeddah 21589, Saudi Arabia
| | | | - Yasuyuki Nogata
- Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry , Abiko 270-1194, Japan
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Lopez JAV, Petitbois JG, Vairappan CS, Umezawa T, Matsuda F, Okino T. Columbamides D and E: Chlorinated Fatty Acid Amides from the Marine Cyanobacterium Moorea bouillonii Collected in Malaysia. Org Lett 2017; 19:4231-4234. [DOI: 10.1021/acs.orglett.7b01869] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Charles S. Vairappan
- Institute
for Tropical Biology and Conservation, Universiti Malaysia Sabah, Kota Kinabalu 88450, Sabah, Malaysia
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15
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Lopez JAV, Al-Lihaibi SS, Alarif WM, Abdel-Lateff A, Nogata Y, Washio K, Morikawa M, Okino T. Wewakazole B, a Cytotoxic Cyanobactin from the Cyanobacterium Moorea producens Collected in the Red Sea. J Nat Prod 2016; 79:1213-8. [PMID: 26980238 DOI: 10.1021/acs.jnatprod.6b00051] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A mass spectrometry (MS)-guided isolation has led to the purification of a new cyanobactin, wewakazole B (1), along with the known compound curacin D from a Red Sea Moorea producens. The planar structure of 1 was elucidated using a combination of NMR and MS techniques. After ozonolysis and acid hydrolysis, the absolute configurations of the amino acid components of 1 were determined by chiral-phase LC-MS and HPLC analyses. Notably, compound 1 exhibited cytotoxic activity toward human MCF7 breast cancer cells (IC50 = 0.58 μM) and human H460 lung cancer cells (IC50 = 1.0 μM) and was also found to be inactive in a siderophore assay.
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Affiliation(s)
| | - Sultan S Al-Lihaibi
- Department of Marine Chemistry, Faculty of Marine Sciences, King Abdulaziz University , P.O. Box 80207, Jeddah 21589, Saudi Arabia
| | - Walied M Alarif
- Department of Marine Chemistry, Faculty of Marine Sciences, King Abdulaziz University , P.O. Box 80207, Jeddah 21589, Saudi Arabia
| | - Ahmed Abdel-Lateff
- Department of Natural Products and Alternative Medicine, Faculty of Pharmacy, King Abdulaziz University , P.O. Box 80260, Jeddah 21589, Saudi Arabia
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University , Minia 61519, Egypt
| | - Yasuyuki Nogata
- Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry , Abiko 270-1194, Japan
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16
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Affiliation(s)
- Taiki Umezawa
- Faculty of Environmental Earth Science, Hokkaido University
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17
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Al-Lihaibi SS, Abdel-Lateff A, Alarif WM, Nogata Y, Ayyad SEN, Okino T. Potent Antifouling Metabolites from Red Sea Organisms. ACTA ACUST UNITED AC 2015. [DOI: 10.14233/ajchem.2015.18701] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Affiliation(s)
- Sabrin R.M. Ibrahim
- Department of Pharmacognosy and Pharmaceutical Chemistry, Faculty of Pharmacy, Taibah University, Al Madinah Al Munawwarah, 30078, Saudi Arabia
- Department of Pharmacognosy, Faculty of Pharmacy, Assiut University, Assiut, 71526, Egypt
| | - Mostafa A. Fouad
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University, 61519, Minia, Egypt
| | - Ahmed Abdel-Lateff
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University, 61519, Minia, Egypt
- Department of Natural Products and Alternative Medicine, Faculty of Pharmacy, King Abdulaziz University, Jeddah, 21589, Kingdom of Saudi Arabia
| | - Tatsufumi Okino
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Gamal A. Mohamed
- Department of Natural Products and Alternative Medicine, Faculty of Pharmacy, King Abdulaziz University, Jeddah, 21589, Kingdom of Saudi Arabia
- Department of Pharmacognosy, Faculty of Pharmacy, Al-Azhar University, Assiut Branch, Assiut, 71524, Egypt
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Kaneko K, Washio K, Umezawa T, Matsuda F, Morikawa M, Okino T. cDNA cloning and characterization of vanadium-dependent bromoperoxidases from the red alga Laurencia nipponica. Biosci Biotechnol Biochem 2014; 78:1310-9. [DOI: 10.1080/09168451.2014.918482] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Abstract
The marine red alga genus Laurencia is one of the richest producers of unique brominated compounds in the marine environment. The cDNAs for two Laurencia nipponica vanadium-dependent bromoperoxidases (LnVBPO1 and LnVBPO2) were cloned and expressed in Escherichia coli. Enzyme assays of recombinant LnVBPO1 and LnVBPO2 using monochlorodimedone revealed that they were thermolabile but their Km values for Br− were significantly lower than other red algal VBPOs. The bromination reaction was also assessed using laurediol, the predicted natural precursor of the brominated ether laurencin. Laurediol, protected by trimethylsilyl at the enyne, was converted to deacetyllaurencin by the LnVBPOs, which was confirmed by tandem mass spectrometry. Native LnVBPO partially purified from algal bodies was active, suggesting that LnVBPO is functional in vivo. These results contributed to our knowledge of the biosynthesis of Laurencia brominated metabolites.
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Affiliation(s)
- Kensuke Kaneko
- Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan
| | - Kenji Washio
- Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan
| | - Taiki Umezawa
- Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan
| | - Fuyuhiko Matsuda
- Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan
| | - Masaaki Morikawa
- Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan
| | - Tatsufumi Okino
- Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan
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Umezawa T, Oguri Y, Matsuura H, Yamazaki S, Suzuki M, Yoshimura E, Furuta T, Nogata Y, Serisawa Y, Matsuyama-Serisawa K, Abe T, Matsuda F, Suzuki M, Okino T. Omaezallene from red alga Laurencia sp.: structure elucidation, total synthesis, and antifouling activity. Angew Chem Int Ed Engl 2014; 53:3909-12. [PMID: 24616156 DOI: 10.1002/anie.201311175] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Indexed: 11/10/2022]
Abstract
Natural antifouling products have been the subject of considerable attention. We screened marine algae for antifouling activity and discovered omaezallenes, the new bromoallene-containing natural products isolated from the red alga Laurencia sp. Described is the isolation, structure elucidation, and total syntheses of omaezallenes. The relative and absolute configurations of natural omaezallenes were unambiguously established through total synthesis. The antifouling activities and ecotoxicity of omaezallenes were also evaluated.
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Affiliation(s)
- Taiki Umezawa
- Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810 (Japan)
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Umezawa T, Oguri Y, Matsuura H, Yamazaki S, Suzuki M, Yoshimura E, Furuta T, Nogata Y, Serisawa Y, Matsuyama-Serisawa K, Abe T, Matsuda F, Suzuki M, Okino T. Omaezallene from Red AlgaLaurenciasp.: Structure Elucidation, Total Synthesis, and Antifouling Activity. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201311175] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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22
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Shibata M, Onodera K, Kumagai M, Shah AA, Ogasawara M, Kurihara H, Okino T, Takahashi K. Supercritical Fluid Extraction of “Koku” Enhancing Compounds from Fish and Fishery by-Products. FSTR 2014. [DOI: 10.3136/fstr.20.1199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Munehisa Shibata
- MC Food Specialties Inc
- Division of Marine Life Science, Faculty of Fisheries Sciences, Hokkaido University
| | - Kei Onodera
- Glico Dairy Products Co. Ltd
- Division of Marine Life Science, Faculty of Fisheries Sciences, Hokkaido University
| | - Momochika Kumagai
- Section of Integrated Environmental Science, Faculty of Environmental Earth Science, Hokkaido University
- Japan Food Research Laboratories
| | - A.K.M. Azad Shah
- Department of Fisheries Technology, Faculty of Fisheries, Bangabandhu Sheikh Mujibur Rahman Agricultural University
| | | | - Hideyuki Kurihara
- Division of Marine Life Science, Faculty of Fisheries Sciences, Hokkaido University
| | - Tatsufumi Okino
- Section of Integrated Environmental Science, Faculty of Environmental Earth Science, Hokkaido University
| | - Koretaro Takahashi
- Division of Marine Life Science, Faculty of Fisheries Sciences, Hokkaido University
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Tan LT, Okino T, Gerwick WH. Bouillonamide: a mixed polyketide-peptide cytotoxin from the marine cyanobacterium Moorea bouillonii. Mar Drugs 2013; 11:3015-24. [PMID: 23966034 PMCID: PMC3766879 DOI: 10.3390/md11083015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Revised: 07/10/2013] [Accepted: 07/30/2013] [Indexed: 11/16/2022] Open
Abstract
The tropical marine cyanobacterium, Moorea bouillonii, has gained recent attention as a rich source of bioactive natural products. Continued chemical investigation of this cyanobacterium, collected from New Britain, Papua New Guinea, yielded a novel cytotoxic cyclic depsipeptide, bouillonamide (1), along with previously reported molecules, ulongamide A and apratoxin A. Planar structure of bouillonamide was established by extensive 1D and 2D NMR experiments, including multi-edited HSQC, TOCSY, HBMC, and ROESY experiments. In addition to the presence of α-amino acid residues, compound 1 contained two unique polyketide-derived moieties, namely a 2-methyl-6-methylamino-hex-5-enoic acid (Mmaha) residue and a unit of 3-methyl-5-hydroxy-heptanoic acid (Mhha). Absolute stereochemistry of the α-amino acid units in bouillonamide was determined mainly by Marfey’s analysis. Compound 1 exhibited mild toxicity with IC50’s of 6.0 µM against the neuron 2a mouse neuroblastoma cells.
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Affiliation(s)
- Lik Tong Tan
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, 637616, Singapore
- Authors to whom correspondence should be addressed; E-Mails: (L.T.T.); (W.H.G.); Tel.: +65-679-038-42 (L.T.T.); +1-858-534-0578 (W.H.G.); Fax: +65-689-694-14 (L.T.T.); +1-858-534-0529 (W.H.G.)
| | - Tatsufumi Okino
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan; E-Mail:
| | - William H. Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093, USA
- Authors to whom correspondence should be addressed; E-Mails: (L.T.T.); (W.H.G.); Tel.: +65-679-038-42 (L.T.T.); +1-858-534-0578 (W.H.G.); Fax: +65-689-694-14 (L.T.T.); +1-858-534-0529 (W.H.G.)
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24
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Anas ARJ, Kisugi T, Umezawa T, Matsuda F, Campitelli MR, Quinn RJ, Okino T. Thrombin inhibitors from the freshwater cyanobacterium Anabaena compacta. J Nat Prod 2012; 75:1546-1552. [PMID: 22950366 DOI: 10.1021/np300282a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Bioassay-guided investigation of the cyanobacterium Anabaena compacta extracts afforded spumigin J (1) and the known thrombin inhibitor spumigin A (2). The absolute configuration of 1 was analyzed by advanced Marfey's methodology. Compounds 1 and 2 inhibited thrombin with EC(50) values of 4.9 and 2.1 μM, and 0.7 and 0.2 μM in the cathepsin B inhibitory assay, respectively. The MM-GBSA methodology predicted spumigin A with 2S-4-methylproline as the better thrombin inhibitor.
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Affiliation(s)
- Andrea Roxanne J Anas
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan
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Takahashi K, Sun Y, Yanagiuchi I, Hosokawa T, Saito T, Komori M, Okino T, Kurasaki M. Stevioside enhances apoptosis induced by serum deprivation in PC12 cells. Toxicol Mech Methods 2012; 22:243-9. [DOI: 10.3109/15376516.2012.658978] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Umezawa T, Sueda M, Kamura T, Kawahara T, Han X, Okino T, Matsuda F. Synthesis and biological activity of kalkitoxin and its analogues. J Org Chem 2011; 77:357-70. [PMID: 22111947 DOI: 10.1021/jo201951s] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Total syntheses of kalkitoxin, isolated from the Caribbean Lyngbya majuscula, and its analogues, 3-epi-, 7-epi-, 8-epi-, 10-epi-, 10-nor-, and 16-nor-kalkitoxin, were achieved via oxazolidinone-based diastereoselective 1,4-addition reaction of a methyl group and efficient TiCl(4)-mediated thiazoline ring formation as the key steps. The biological activities of synthetic kalkitoxin and its analogues were evaluated with brine shrimp.
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Affiliation(s)
- Taiki Umezawa
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan
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27
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Nishikawa K, Nakahara H, Shirokura Y, Nogata Y, Yoshimura E, Umezawa T, Okino T, Matsuda F. Total synthesis of 10-isocyano-4-cadinene and its stereoisomers and evaluations of antifouling activities. J Org Chem 2011; 76:6558-73. [PMID: 21755975 DOI: 10.1021/jo2008109] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first enantioselective total synthesis of 10-isocyano-4-cadinene, a marine sesquiterpene isolated from nudibranchs of the family Phyllidiidae, and determination of its absolute stereochemistry were achieved. 10-Isocyano-4-cadinene is expected to be a novel nontoxic antifouling agent. In the synthesis, intermolecular Diels-Alder reaction and samarium diiodide induced Barbier-type cyclization were employed as key steps. The absolute configuration of 10-isocyano-4-cadinene was determined as (1S,6S,7R,10S) by comparison of the optical rotations between natural and synthetic samples. In addition, the authors successfully synthesized 10-epi- and di-1,6-epi-10-isocyano-4-cadinene through the same synthetic pathway. Antifouling activities against Balanus amphitrite with the cadinenes were also evaluated.
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Affiliation(s)
- Keisuke Nishikawa
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan
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28
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Bernhardt P, Okino T, Winter JM, Miyanaga A, Moore BS. A stereoselective vanadium-dependent chloroperoxidase in bacterial antibiotic biosynthesis. J Am Chem Soc 2011; 133:4268-70. [PMID: 21384874 DOI: 10.1021/ja201088k] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Halogenases catalyze reactions that introduce halogen atoms into electron-rich organic molecules. Vanadium-dependent haloperoxidases are generally considered to be promiscuous halogenating enzymes that have thus far been derived exclusively from eukaryotes, where their cellular function is often disputed. We now report the first biochemical characterization of a bacterial vanadium-dependent chloroperoxidase, NapH1 from Streptomyces sp. CNQ-525, which catalyzes a highly stereoselective chlorination-cyclization reaction in napyradiomycin antibiotic biosynthesis. This finding biochemically links a vanadium chloroperoxidase to microbial natural product biosynthesis.
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Affiliation(s)
- Peter Bernhardt
- Scripps Institution of Oceanography, University of California, San Diego, California 92093, USA
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Abstract
Asymmetric total synthesis of danicalipin A was achieved. The synthesis was characterized by diastereoselective introduction of chlorine atoms. Biological activities with synthetic danicalipin A, its enantiomer, and racemate were also evaluated toward brine shrimp. Both enantiomers of danicalipin A showed almost the same activity.
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Affiliation(s)
- Taiki Umezawa
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan.
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30
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Kawahara T, Kumaki Y, Kamada T, Ishii T, Okino T. Absolute configuration of chlorosulfolipids from the chrysophyta Ochromonas danica. J Org Chem 2010; 74:6016-24. [PMID: 19627129 DOI: 10.1021/jo900860e] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We isolated eight chlorosulfolipids (1-8) from the chrysophyta Ochromonas danica (IAM CS-2), including five new chlorosulfolipids (2-5, 8). The planar structures of all the compounds were elucidated by 1D and 2D NMR and ESI-MS/MS analyses. We determined the relative configuration of seven chlorosulfolipids (1-7), including the most commonly known chlorosulfolipid, 2,2,11,13,15,16-hexachlorodocosane-1,14-disulfate (1), by J-based configuration analysis (JBCA). The absolute configuration of each compound was determined using a modified Mosher's method after chemical degradation. 2,2,11,13,15,16-Hexachloro-14-docosanol-1-sulfate (2) was the most toxic to brine shrimp (Artemia salina) larvae (LC(50) 0.27 microg/mL). Compounds 1 and 4-8 were less toxic (LC(50) 2.2-6.9 microg/mL). Compound 3 was not toxic at 30 microg/mL.
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Affiliation(s)
- Teppei Kawahara
- Graduate School of Environmental Science, Hokkaido University, North-10, West-5, Kita-ku, Sapporo 060-0810, Japan
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Nishikawa K, Nakahara H, Shirokura Y, Nogata Y, Yoshimura E, Umezawa T, Okino T, Matsuda F. Total Synthesis of 10-Isocyano-4-cadinene and Determination of Its Absolute Configuration. Org Lett 2010; 12:904-7. [DOI: 10.1021/ol9027336] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Keisuke Nishikawa
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba 270-1194, Japan, and CERES, Inc., 1-6-1 Ogawa-cho, Kanda, Chiyoda-ku, Tokyo 101-0052, Japan
| | - Hiroshi Nakahara
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba 270-1194, Japan, and CERES, Inc., 1-6-1 Ogawa-cho, Kanda, Chiyoda-ku, Tokyo 101-0052, Japan
| | - Yousuke Shirokura
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba 270-1194, Japan, and CERES, Inc., 1-6-1 Ogawa-cho, Kanda, Chiyoda-ku, Tokyo 101-0052, Japan
| | - Yasuyuki Nogata
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba 270-1194, Japan, and CERES, Inc., 1-6-1 Ogawa-cho, Kanda, Chiyoda-ku, Tokyo 101-0052, Japan
| | - Erina Yoshimura
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba 270-1194, Japan, and CERES, Inc., 1-6-1 Ogawa-cho, Kanda, Chiyoda-ku, Tokyo 101-0052, Japan
| | - Taiki Umezawa
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba 270-1194, Japan, and CERES, Inc., 1-6-1 Ogawa-cho, Kanda, Chiyoda-ku, Tokyo 101-0052, Japan
| | - Tatsufumi Okino
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba 270-1194, Japan, and CERES, Inc., 1-6-1 Ogawa-cho, Kanda, Chiyoda-ku, Tokyo 101-0052, Japan
| | - Fuyuhiko Matsuda
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba 270-1194, Japan, and CERES, Inc., 1-6-1 Ogawa-cho, Kanda, Chiyoda-ku, Tokyo 101-0052, Japan
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32
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Gamal-Eldeen AM, Abdel-Lateff A, Okino T. Modulation of carcinogen metabolizing enzymes by chromanone A; a new chromone derivative from algicolous marine fungus Penicillium sp. Environ Toxicol Pharmacol 2009; 28:317-322. [PMID: 21784022 DOI: 10.1016/j.etap.2009.05.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2009] [Revised: 04/23/2009] [Accepted: 05/14/2009] [Indexed: 05/31/2023]
Abstract
A marine fungal isolate, Penicillium sp. fungus isolated from seaweed, Ulva sp., led to the isolation of a new chromone derivatives, 2-(hydroxymethyl)-8-methoxy-3-methyl-4H-chromen-4-one (chromanone A). The structure was determined by interpretation of their spectroscopic data (1D and 2D NMR, MS, UV and IR). At the nitiation stage of carcinogenesis, carcinogens is activated by cytochrome P-450 1A (CYP1A) and detoxified by glutathione S-transferases (GST), quinine reductase (QR), and epoxide hydrolase (mEH). We tested the modulatory effect of chromanone A on these carcinogen metabolizing enzymes. The results indicated that chromanone A (4μg/ml) is a promising inhibitor of CYP1A activity up to 60% of the stimulated-CYP1A in murine hepatoma cells (Hepa1c1c7), and it significantly induced GST but not total thiols at low concentrations. Chromanone A had no influence on QR activity, while it resulted in a significant dose-dependant enhancement mEH activity in Hepa1c1c7 cells (P<0.05-0.01). Additionally, chromanone A possessed a potent specific radical scavenging activity against hydroxyl radicals more than peroxyl radicals that may be responsible for the inhibitory effect of chromanone A on the induced-DNA damage in cells. In conclusion, this study proved that chromanone A may act as an active tumor anti-initiating via modulation of carcinogen metabolizing enzymes and protection from DNA damage.
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Affiliation(s)
- Amira M Gamal-Eldeen
- Cancer Biology Laboratory, Center of Excellency for Advanced Science, National Research Center, Dokki 12622, Cairo, Egypt
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33
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Abstract
Micropeptins C (1), D (2), E (3), and F (4) have been isolated from the freshwater cyanobacterium Microcystis aeruginosa (NIES-100). The structures were elucidated by analyses of MS, NMR spectra, and chemical degradation. Micropeptins C, D, E, and F inhibited chymotrypsin with IC(50)'s of 1.1, 1.2, 1.0, and 1.5 microg/mL, respectively.
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Affiliation(s)
- Takaya Kisugi
- Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, Japan
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34
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Abstract
Two antifouling compounds, aureobasidin (1), a new ester with an unusual 4,6-dihydroxydecanoic acid residue, and (3 R,5 S)-3,5-dihydroxydecanoic acid (2), were isolated from the marine-derived fungus Aureobasidium sp., in addition to (5 R,3 Z)-5-hydroxydec-3-enoic acid (3) and ( R)-3-hydroxydecanoic acid (4). The structures were unambiguously established by IR, 1D and 2D NMR spectroscopic and mass spectral data. Compounds 1-3 were found to be active against Bacillus subtilis, Escherichia coli and Staphyllococcus aureus. Compound 3 showed fungistatic activity against Candida albicans.
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Affiliation(s)
- Ahmed Abdel-Lateff
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University, Minia 61519, Egypt
| | - Ehab S. Elkhayat
- Department of Pharmacognosy, Faculty of Pharmacy, Azhar University, Assuit 71524, Egypt
| | - Mostafa A. Fouad
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University, Minia 61519, Egypt
| | - Tatsufumi Okino
- Faculty of earth and environmental science, Hokkaido University, Sapporo, 060-0810, Japan
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Abdel-Lateff A, Elkhayat ES, Fouad MA, Okino T. Aureobasidin, new antifouling metabolite from marine-derived fungus Aureobasidium sp. Nat Prod Commun 2009; 4:389-394. [PMID: 19413119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023] Open
Abstract
Two antifouling compounds, aureobasidin (1), a new ester with an unusual 4,6-dihydroxydecanoic acid residue, and (3R,5S)-3,5-dihydroxydecanoic acid (2), were isolated from the marine-derived fungus Aureobasidium sp., in addition to (5R,3Z)-5-hydroxydec-3-enoic acid (3) and (R)-3-hydroxydecanoic acid (4). The structures were unambiguously established by IR, 1D and 2D NMR spectroscopic and mass spectral data. Compounds 1-3 were found to be active against Bacillus subtilis, Escherichia coli and Staphyllococcus aureus. Compound 3 showed fungistatic activity against Candida albicans.
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Affiliation(s)
- Ahmed Abdel-Lateff
- Department ofPharmacognosy, Faculty of Pharmacy, Minia University, Minia 61519, Egypt
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36
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Vairappan CS, Suzuki M, Ishii T, Okino T, Abe T, Masuda M. Antibacterial activity of halogenated sesquiterpenes from Malaysian Laurencia spp. Phytochemistry 2008; 69:2490-2494. [PMID: 18718619 DOI: 10.1016/j.phytochem.2008.06.015] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2008] [Revised: 05/01/2008] [Accepted: 06/26/2008] [Indexed: 05/26/2023]
Abstract
During our studies on Malaysian Laurencia species, brominated metabolites, tiomanene, acetylmajapolene B, and acetylmajapolene A were isolated from an unrecorded species collected at Pulau Tioman, Pahang along with known majapolene B and majapolene A. Acetylmajapolene A was a mixture of diastereomers as in the case of majapolene A. Tiomanene may be a plausible precursor for acetylmajapolenes B and A. In addition, three known halogenated sesquiterpenes and two known halogenated C(15) acetogenins were found from other two unrecorded species collected at Pulau Karah, Terengganu and Pulau Nyireh, Terengganu, respectively. Some of these halogenated metabolites showed moderate antibacterial activity against some marine bacteria.
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Affiliation(s)
- Charles Santhanaraju Vairappan
- Laboratory of Natural Products Chemistry, Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, Locked Bag 2073, 88999 Kota Kinabalu, Sabah, Malaysia.
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37
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Ishii T, Okino T, Mino Y. A ceramide and cerebroside from the starfish asterias amurensis Lütken and their plant-growth promotion activities. J Nat Prod 2006; 69:1080-2. [PMID: 16872149 DOI: 10.1021/np050530e] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The new phytosphingosine-type ceramide asteriaceramide A (1) and glucocerebroside asteriacerebroside G (2), together with two known cerebrosides, asteriacerebrosides A and B, were isolated from lipophilic fractions of the whole bodies of the Northern Pacific starfish Asterias amurensis Lütken. The water-soluble fraction afforded two known asterosaponins, glycoside B(2) and asterosaponin-1. The structures of 1 and 2 were determined on the basis of chemical and spectroscopic evidence as (2S,3S,4R,13Z)-2-[(2'R)-2-hydroxyhexadecanoylamino]-13-docosene-1,3,4-triol (1) and 1-O-(beta-d-glucopyranosyl)-(2S,3R,4E,13Z)-2-[(2'R)-2-hydroxytetradecanoylamino]-4,13-docosadiene-1,3-diol (2). Compounds 1, 2, and asteriacerebrosides A and B promoted plant growth in sprouts of Brassica campestris.
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Affiliation(s)
- Takahiro Ishii
- Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan
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38
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Ishii T, Okino T, Suzuki M, Machiguchi Y. Tichocarpols A and B, two novel phenylpropanoids with feeding-deterrent activity from the red alga Tichocarpus crinitus. J Nat Prod 2004; 67:1764-1766. [PMID: 15497960 DOI: 10.1021/np0498509] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Two novel phenylpropanoic acid derivatives, tichocarpol A (1) and tichocarpol B (2), were isolated along with floridoside and isethionic acid from the red alga Tichocarpus crinitus. The structures of these novel metabolites were elucidated using a combination of spectral (1D and 2D NMR techniques and ESIMS) and chemical methods. Compounds 1, 2, and floridoside exhibited feeding-deterrent activity against the sea urchin Strongylocentrotus intermedius.
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Affiliation(s)
- Takahiro Ishii
- Division of Material Science, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan
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39
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Yokokawa F, Asano T, Okino T, Gerwick WH, Shioiri T. An expeditious total synthesis of kalkitoxins: determination of the absolute stereostructure of natural kalkitoxin. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.06.014] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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40
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Li WI, Marquez BL, Okino T, Yokokawa F, Shioiri T, Gerwick WH, Murray TF. Characterization of the preferred stereochemistry for the neuropharmacologic actions of antillatoxin. J Nat Prod 2004; 67:559-568. [PMID: 15104484 DOI: 10.1021/np0303409] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Antillatoxin is a potent ichthyotoxin and cytotoxin previously discovered from the marine cyanobacterium Lyngbya majuscula. Ensuing studies of its mechanism of action showed it to activate the mammalian voltage-gated sodium channel at a pharmacological site that is distinct from any previously described. The structure of antillatoxin, initially formulated from spectroscopic information, was subsequently corrected at one stereocenter (C-4) as a result of synthesis of four different antillatoxin stereoisomers (all possible C-4 and C-5 diastereomers). In the current study these four stereoisomers, (4R,5R)-, (4S,5R)-, (4S,5S)-, and (4R,5S)-antillatoxin, were characterized in five different biological assay systems: ichthyotoxicity to goldfish, microphysiometry using cerebellar granule cells (CGCs), lactose dehydrogenase efflux from CGCs, monitoring of intracellular Ca(2+) concentrations in CGCs, and cytotoxicity to Neuro 2a cells. Across these various biological measures there was great consistency in that the natural antillatoxin (the 4R,5R-isomer) was greater than 25-fold more potent than any of the other stereoisomers. Detailed NMR studies provided a number of torsion and distance constraints that were modeled using the MM2 force field to yield predicted solution structures of the four antillatoxin stereoisomers. The macrocycle and side chain of natural (4R,5R)-antillatoxin present an overall "L-shaped" topology with an accumulation of polar substituents on the external surface of the macrocycle and a hydrogen bond between N(H)-7' and the C(O)-1 carbonyl. The decreased potency of the three non-naturally occurring antillatoxin stereoisomers is certainly a result of their dramatically altered overall molecular topologies.
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Affiliation(s)
- W I Li
- Department of Physiology and Pharmacology, College of Veterinary Medicine, University of Georgia, Athens, Georgia 30602-7389, USA
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41
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Fukuta Y, Ohshima T, Gnanadesikan V, Shibuguchi T, Nemoto T, Kisugi T, Okino T, Shibasaki M. Enantioselective syntheses and biological studies of aeruginosin 298-A and its analogs: application of catalytic asymmetric phase-transfer reaction. Proc Natl Acad Sci U S A 2004; 101:5433-8. [PMID: 15004282 PMCID: PMC397400 DOI: 10.1073/pnas.0307154101] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Aeruginosin 298-A was isolated from the freshwater cyanobacterium Microcystis aeruginosa (NIES-298) and is an equipotent thrombin and trypsin inhibitor. A variety of analogs were synthesized to gain insight into the structure-activity relations. We developed a versatile synthetic process for aeruginosin 298-A as well as several attractive analogs, in which all stereocenters were controlled by catalytic asymmetric phase-transfer reaction promoted by two-center asymmetric catalysts and catalytic asymmetric epoxidation promoted by a lanthanide-BINOL complex. Furthermore, serine protease inhibitory activities of aeruginosin 298-A and its analogs were examined.
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Affiliation(s)
- Yuhei Fukuta
- Graduate School of Pharmaceutical Sciences, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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42
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Toda H, Uemura Y, Okino T, Kawanishi T, Kawashima H. Use of nitrogen stable isotope ratio of periphyton for monitoring nitrogen sources in a river system. Water Sci Technol 2002; 46:431-435. [PMID: 12523790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In order to confirm the usefulness of the N stable isotope ratio of periphyton (mainly composed of attached algae) as an indicator for monitoring the N sources in river watersheds, we measured the isotope ratio of periphyton along the Chikuma River. In the river, both the concentrations of dissolved total nitrogen (DTN) and the delta15N values of periphyton increased downstream. Specific nitrogen loading rates (SNLR) calculated from administrative data also showed an increase downstream from 7 to 11 kg N ha(-1) yr(-1), with the increasing contribution by sewage and livestock waste from 6 to 40% to total N loading. There are significant positive relationships between the DTN concentration and the SNLR (r2=0.54, P<0.05), and the delta15N values of periphyton and the SNLR (r2=0.78, P<0.05). The increase in DTN concentration reflected the increase in input of N loading. The increase in delta15N of periphyton might reflect the increase in relative contribution by sewage and livestock waste down the river, especially the increase in sewage. The present study indicates the usefulness of the N stable isotope ratio of periphyton as an indicator for monitoring N sources in a river system.
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Affiliation(s)
- H Toda
- Department of Environmental Science, Faculty of Science, Shinshu University, 3-1-1 Asahi, Matsumoto 390-8621, Japan
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43
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Ohyama F, Okino T, Ushirogawa H. Massaliatrema misgurni n. sp. (Trematoda: Heterophyidae) whose metacercariae encyst in loaches (Misgurnus anguillicaudatus). Parasitol Int 2001; 50:267-71. [PMID: 11719113 DOI: 10.1016/s1383-5769(01)00084-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Hitherto unknown metacercariae were found encysted in loaches (Misgurnus anguillicaudatus) from China. They were experimentally fed to golden hamsters, and gravid adults were recovered 1 week post-infection from their small intestines. A new species, Massaliatrema misgurni n. sp. (Heterophyidae), is described from the adults. This new species is different from M. gyrinicola Dollfus and Timon-David, 1960, in having a smaller acetabulum/oral sucker ratio, less branched vitellaria widely entering the intercecal anteroacetabular area and an almost median seminal receptacle; and from M. yamashitai Kamiya and Ohbayashi, 1975, in having a larger acetabulum/oral sucker ratio, with the seminal vesicle situated in the uterine loop and the vitellaria entering the intercecal anteroacetabular area. This report is the first record of M. anguillicaudatus as a second intermediate host of the genus Massaliatrema Dollfus and Timon-David, 1960.
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Affiliation(s)
- F Ohyama
- Department of Parasitology, Kawasaki Medical School, 577 Matsushima, 701-0192, Kurashiki, Japan.
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44
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Nakoji M, Kanayama T, Okino T, Takemoto Y. Chiral phosphine-free Pd-mediated asymmetric allylation of prochiral enolate with a chiral phase-transfer catalyst. Org Lett 2001; 3:3329-31. [PMID: 11594826 DOI: 10.1021/ol016567h] [Citation(s) in RCA: 159] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text]. A chiral phase-transfer catalyst has been applied to the asymmetric allylation of the tert-butyl glycinate-benzophenone Schiff base with various allylic acetates for the first time to give the allylated products in good yields and with comparable to higher enantioselectivity than for asymmetric alkylation at the same temperature (91-96% ee) without any chiral ligands for coordinating to the palladium.
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Affiliation(s)
- M Nakoji
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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45
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Abstract
Bioassay-guided fractionation of organic extracts from two Lyngbya majuscula collections led to the isolation of a new secondary metabolite, antillatoxin B, an unusual N-methyl homophenylalanine analogue of the potent neurotoxin antillatoxin. Its structure was deduced from 2D NMR and data comparisons with antillatoxin. Antillatoxin B exhibited significant sodium channel-activating (EC(50) = 1.77 microM) and ichthyotoxic (LC(50) = 1 microM) properties.
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Affiliation(s)
- L M Nogle
- College of Pharmacy, Oregon State University, Corvallis, Oregon 97331, USA
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46
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Li WI, Berman FW, Okino T, Yokokawa F, Shioiri T, Gerwick WH, Murray TF. Antillatoxin is a marine cyanobacterial toxin that potently activates voltage-gated sodium channels. Proc Natl Acad Sci U S A 2001; 98:7599-604. [PMID: 11416227 PMCID: PMC34714 DOI: 10.1073/pnas.121085898] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2001] [Indexed: 11/18/2022] Open
Abstract
Antillatoxin (ATX) is a lipopeptide derived from the pantropical marine cyanobacterium Lyngbya majuscula. ATX is neurotoxic in primary cultures of rat cerebellar granule cells, and this neuronal death is prevented by either N-methyl-d-aspartate (NMDA) receptor antagonists or tetrodotoxin. To further explore the potential interaction of ATX with voltage-gated sodium channels, we assessed the influence of tetrodotoxin on ATX-induced Ca2+ influx in cerebellar granule cells. The rapid increase in intracellular Ca2+ produced by ATX (100 nM) was antagonized in a concentration-dependent manner by tetrodotoxin. Additional, more direct, evidence for an interaction with voltage-gated sodium channels was derived from the ATX-induced allosteric enhancement of [3H]batrachotoxin binding to neurotoxin site 2 of the alpha subunit of the sodium channel. ATX, moreover, produced a strong synergistic stimulation of [3H]batrachotoxin binding in combination with brevetoxin, which is a ligand for neurotoxin site 5 on the voltage-gated sodium channel. Positive allosteric interactions were not observed between ATX and either alpha-scorpion toxin or the pyrethroid deltamethrin. That ATX interaction with voltage-gated sodium channels produces a gain of function was demonstrated by the concentration-dependent and tetrodotoxin-sensitive stimulation of 22Na+ influx in cerebellar granule cells exposed to ATX. Together these results demonstrate that the lipopeptide ATX is an activator of voltage-gated sodium channels. The neurotoxic actions of ATX therefore resemble those of brevetoxins that produce neural insult through depolarization-evoked Na+ load, glutamate release, relief of Mg2+ block of NMDA receptors, and Ca2+ influx.
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Affiliation(s)
- W I Li
- Department of Physiology and Pharmacology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602-7389, USA
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47
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Okino T, Onda M, Matsukura N, Inada KI, Tatematsu M, Suzuki S, Shimada T. Sequential histopathological changes in vivo after suicide gene therapy of gastric cancer induced by N-methyl-N'-nitro-N-nitrosoguanidine in rats. Jpn J Cancer Res 2001; 92:673-9. [PMID: 11429057 PMCID: PMC5926760 DOI: 10.1111/j.1349-7006.2001.tb01147.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Gastrointestinal cancer is the most important clinical target of gene therapy. Suicide gene therapy, such as with the herpes simplex virus type 1 thymidine kinase (HSV-TK) gene, has been shown to exert antitumor efficacy in various cancer models in vitro. We previously reported in situ gene transfer and gene therapy for gastric cancer induced by N-ethyl-N'-nitro-N-nitrosoguanidine (ENNG) in dogs. Here, we describe the sequential histopathological changes after suicide gene therapy of N-methyl-N'-nitro-N-nitrosoguanidine (MNNG)-induced gastric cancer in rats. Gastric tumors were induced by MNNG in 38 / 73 (52%) of Wistar strain rats. The suicide gene therapy group (14 rats) was subjected to in situ gene transfer with a recombinant adenovirus vector carrying the HSV-TK gene driven by CAG promoter (Ad.CAGHSV-TK) in gastric tumor, followed by the antiviral drug ganciclovir (GCV). To observe the histopathological changes at various times after HSV-TK / GCV gene therapy, groups of animals were sacrificed at 3, 8, and 30 days after gene transfer. Apoptosis in the gastric tumors was detected by the TUNEL method to assess the efficacy of HSV-TK / GCV gene therapy, and it was marked in the 8- and 30-day treatment groups compared to the sham operation controls (P < 0.001). Various histopathological changes, degeneration of cancer tissue and fibrosis after necrosis and apoptosis were significantly greater in the 30-day treatment group. The HSV-TK gene was detectable in peripheral blood by PCR until 30 days after gene transfer. These results may be useful in devising a method of suicide gene therapy for humans.
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Affiliation(s)
- T Okino
- First Department of Surgery, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8603, Japan.
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48
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Okino T, Takemoto Y. Asymmetric alkylation of tert-butyl glycinate Schiff base with chiral quaternary ammonium salt under micellar conditions. Org Lett 2001; 3:1515-7. [PMID: 11388855 DOI: 10.1021/ol015829c] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] The asymmetric alkylation of the tert-butyl glycinate-benzophenone Schiff base 1 with various arylmethyl bromides catalyzed by O-allyl-N-(9-anthracenylmethyl)cinchonidinium bromide (2) proceeded smoothly under micellar conditions (5 equiv of 1 M KOH and 0.4 equiv of Triton X-100) to give the alkylated products in good yields and with good enantioselectivity (72-85% ee), depending on the electrophiles.
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Affiliation(s)
- T Okino
- Department of Chemistry, Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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49
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Okino T, Egami H, Ohmachi H, Takai E, Tamori Y, Nakagawa A, Nakano S, Sakamoto O, Suda T, Ogawa M. Immunohistochemical analysis of distribution of RON receptor tyrosine kinase in human digestive organs. Dig Dis Sci 2001; 46:424-9. [PMID: 11281194 DOI: 10.1023/a:1005673420464] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
The immunohistochemical distribution of RON receptor tyrosine kinase in digestive organs of both human fetus and adult, including the esophagus, stomach, duodenum, small intestine, colon, rectum, liver, gallbladder, pancreas, and spleen, was investigated semiquantitively using an affinity-purified rabbit polyclonal antibody. RON was observed to be widely distributed throughout various digestive organs and cell types in humans. The immunoreactivity for RON was observed in the epithelium of the esophagus, small intestine, colon, hepatocytes, Kupffer cells, and splenic macrophages both in the adult and the fetus, suggesting that the MSP/RON signaling pathway possesses the proper biological properties to possibly be involved in morphogenesis or differentiation of cells in these organs and cell types. Several organs differed in immunoreactivity between adult and fetus. No immunoreactive cells were found in the pancreas of adults; however, immunoreactivity was observed in acinar cells and in some of the duct or ductular cells and endocrine cells of the islet of the fetus. Similarly, immunoreactivity was not observed in gastric mucosa except in the intestinal metaplastic cells in adults; however, immunoreactivity was found in the foveolar epithelium of the stomach of the fetus. Although the biological significance of RON in malignancy is unclear, the presence of RON immunoreactivity in the fetus and it lack in the adult may indicate that RON is a oncofetal substance in human pancreas and stomach.
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Affiliation(s)
- T Okino
- Department of Surgery II, Kumamoto University School of Medicine, Japan
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50
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Matsukura N, Onda M, Okino T, Shimada T. [Gastric cancer--novel strategy of gene therapy for gastric cancer]. Nihon Rinsho 2001; 59:90-3. [PMID: 11197869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Recently stage-oriented treatment for gastric cancer has been done in Japan. Endoscopic mucosal resection for intramucosal cancer and wedge resection under laparoscopy for minimal invasive cancer in the stomach have been performed. For advanced gastric cancer, extended lymph node dissection(D2) has been applied as standard treatment in Japan. However, new strategy has been required for advanced gastric cancer with distant lymph node metastasis and/or peritoneal dissemination. It is well known that gene therapy for cancer has limitation of efficacy, but we believe the new strategy will be available in post-genome era for gastric cancer treatment using 1. developing novel adenovirus, 2. usage of drug delivery system and 3. effective treatment for adverse effect.
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Affiliation(s)
- N Matsukura
- First Department of Surgery, Nippon Medical School
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