1
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Kosgahakumbura L, Gamage J, Robertson LP, Muhammad T, Hellman B, Göransson U, Jayasinghe P, Hettiarachchi C, Cárdenas P, Gunasekera S. Screening for antibacterial and cytotoxic activities of Sri Lankan marine sponges through microfractionation: Isolation of bromopyrrole alkaloids from Stylissa massa. PLoS One 2024; 19:e0296404. [PMID: 38190387 PMCID: PMC10773956 DOI: 10.1371/journal.pone.0296404] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Accepted: 12/12/2023] [Indexed: 01/10/2024] Open
Abstract
Sri Lanka is a biodiversity hotspot and one of the richest geographical locations of marine sponges in the Indian ocean. However, the most extensive taxonomical study on Sri Lankan sponge biodiversity dates back ~100 years and only a limited number of studies have been conducted on sponge natural products. In the current study, 35 marine sponge specimens (collected from 16 sponge habitats around Sri Lanka) were identified, microfractionated and evaluated for antibacterial and anticancer assays. In total, 30 species were characterized, of which 19 species gave extracts with antibacterial and/or cytotoxic activities. Microfractionated organic extract of Aciculites orientalis gave the most potent antibacterial activity against Staphylococcus aureus and strongest lymphoma cell toxicity was exhibited by the organic extract of Acanthella sp. Guided by the molecular ion peaks in the bioactive fractions, large-scale extraction of Stylissa massa led to the isolation of three bromopyrrole alkaloids, sceptrin, hymenin and manzacidin A/C. Of these, sceptrin exhibited broad spectrum antibacterial activity against both Escherichia coli and S. aureus (MIC of 62.5 μM against both species). Based on natural product literature, seven promising species were identified as understudied. Their further exploration may lead to the discovery of structurally novel compounds.
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Affiliation(s)
- Lakmini Kosgahakumbura
- Department of Chemistry, University of Colombo, Colombo, Sri Lanka
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala, Sweden
| | - Jayani Gamage
- Department of Chemistry, University of Colombo, Colombo, Sri Lanka
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala, Sweden
| | - Luke P. Robertson
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala, Sweden
| | - Taj Muhammad
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala, Sweden
| | - Björn Hellman
- Drug Safety and Toxicology, Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala, Sweden
| | - Ulf Göransson
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala, Sweden
| | - Prabath Jayasinghe
- Marine Biological Resources Division, National Aquatic Resources Research and Development Agency (NARA), Colombo, Sri Lanka
| | | | - Paco Cárdenas
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala, Sweden
| | - Sunithi Gunasekera
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala, Sweden
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2
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Grasset C, Groeneveld M, Tranvik LJ, Robertson LP, Hawkes JA. Hydrophilic Species Are the Most Biodegradable Components of Freshwater Dissolved Organic Matter. Environ Sci Technol 2023; 57:13463-13472. [PMID: 37646447 PMCID: PMC10501193 DOI: 10.1021/acs.est.3c02175] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 07/29/2023] [Accepted: 07/31/2023] [Indexed: 09/01/2023]
Abstract
Aquatic dissolved organic matter (DOM) is a crucial component of the global carbon cycle, and the extent to which DOM escapes mineralization is important for the transport of organic carbon from the continents to the ocean. DOM persistence strongly depends on its molecular properties, but little is known about which specific properties cause the continuum in reactivity among different dissolved molecules. We investigated how DOM fractions, separated according to their hydrophobicity, differ in biodegradability across three different inland water systems. We found a strong negative relationship between hydrophobicity and biodegradability, consistent for the three systems. The most hydrophilic fraction was poorly recovered by solid-phase extraction (SPE) (3-28% DOC recovery) and was thus selectively missed by mass spectrometry analysis during SPE. The change in DOM composition after incubation was very low according to SPE-ESI (electrospray ionization)-mass spectrometry (14% change, while replicates had 11% change), revealing that this method is sub-optimal to assess DOM biodegradability, regardless of fraction hydrophobicity. Our results demonstrate that SPE-ESI mass spectrometry does not detect the most hydrophilic and most biodegradable species. Hence, they question our current understanding of the relationships between DOM biodegradability and its molecular composition, which is built on the use of this method.
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Affiliation(s)
- Charlotte Grasset
- Department
of Ecology and Genetics, Limnology, Uppsala
University, Uppsala 75236, Sweden
| | - Marloes Groeneveld
- Department
of Ecology and Genetics, Limnology, Uppsala
University, Uppsala 75236, Sweden
| | - Lars J. Tranvik
- Department
of Ecology and Genetics, Limnology, Uppsala
University, Uppsala 75236, Sweden
| | - Luke P. Robertson
- Department
of Pharmaceutical Biosciences, Uppsala University, Uppsala 75237, Sweden
| | - Jeffrey A. Hawkes
- Department
of Chemistry, BMC, Uppsala University, Uppsala 75237, Sweden
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3
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Beniddir MA, Göransson U, Robertson LP. On the structures of the penduflorines from Tabernaemontana penduliflora. Fitoterapia 2023; 167:105506. [PMID: 37068714 DOI: 10.1016/j.fitote.2023.105506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 03/30/2023] [Accepted: 04/03/2023] [Indexed: 04/19/2023]
Abstract
The structures of the recently published monoterpene indole alkaloids penduflorines A and B (1a and 1b) isolated from Tabernaemontana penduliflora (Apocynaceae) have been revised. Rather than an inseparable mixture of two compounds, they appear to be the known alkaloid vobasine (2). Although we could not comprehensively revise the structures of penduflorines C-E due to lacking spectral data, since their structural elucidations were based on that of 1a and 1b, their structures should also be treated with caution.
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Affiliation(s)
- Mehdi A Beniddir
- Équipe "Chimie des Substances Naturelles", Université Paris-Saclay, CNRS, BioCIS, 91400 Orsay, France
| | - Ulf Göransson
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala University, 75237 Uppsala, Sweden
| | - Luke P Robertson
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala University, 75237 Uppsala, Sweden.
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4
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Rajendran S, Robertson LP, Kosgahakumbura L, Fernando C, Göransson U, Wang H, Hettiarachchi C, Gunasekera S. Antibacterial eremophilane sesquiterpenoids from Xylaria feejeensis, an endophytic fungi of the medicinal plant Geophila repens. Fitoterapia 2023; 167:105496. [PMID: 36990291 DOI: 10.1016/j.fitote.2023.105496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 03/24/2023] [Accepted: 03/25/2023] [Indexed: 03/30/2023]
Abstract
Geophila repens (L.) I.M. Johnst (Rubiaceae) is a traditional medicinal plant used in Sri Lanka for the treatment of bacterial infections. Due to its rich endophytic fungi content, it was postulated that endophytically-produced specialized metabolites may be responsible for its purported antibacterial effects. To test this hypothesis, eight pure endophytic fungal cultures were isolated from G. repens, then extracted and screened for antibacterial activity in a disc diffusion assay against Staphylococcus aureus, Bacillus cereus, Escherichia coli and Pseudomonas aeruginosa. Large scale culturing, extraction, and purification of the most active fungal extract, obtained from Xylaria feejeensis, led to the isolation of 6',7'-didehydrointegric acid (1), 13-carboxyintegric acid (2), and four known compounds including integric acid (3). Compound (3) was isolated as the key antibacterial component (MIC = 16 μg/mL against Bacillus subtilis, 64 μg/mL against Methicillin-Resistant S. aureus). 3 and its analogues were devoid of hemolytic activity up to the highest tested concentration of 45 μg/mL. This study demonstrates that metabolites produced by endophytic fungi may contribute to the biological activity of some medicinal plants. Endophytic fungi should be evaluated as a potential source of antibiotics, especially from unexplored medicinal plants traditionally used for the treatment of bacterial infections.
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Affiliation(s)
- Sanjeevan Rajendran
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Center, Uppsala University, Sweden; Department of Chemistry, Faculty of Science, University of Colombo, Sri Lanka
| | - Luke P Robertson
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Center, Uppsala University, Sweden
| | - Lakmini Kosgahakumbura
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Center, Uppsala University, Sweden; Department of Chemistry, Faculty of Science, University of Colombo, Sri Lanka
| | - Chathurika Fernando
- Department of Chemistry, Faculty of Science, University of Colombo, Sri Lanka
| | - Ulf Göransson
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Center, Uppsala University, Sweden
| | - Helen Wang
- Department of Medical Biochemistry and Microbiology, Biomedical Centre, Uppsala University, Sweden
| | | | - Sunithi Gunasekera
- Pharmacognosy, Department of Pharmaceutical Biosciences, Biomedical Center, Uppsala University, Sweden.
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5
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Holland DC, Prebble DW, Er S, Hayton JB, Robertson LP, Avery VM, Domanskyi A, Kiefel MJ, Hooper JNA, Carroll AR. α-Synuclein Aggregation Inhibitory Prunolides and a Dibrominated β-Carboline Sulfamate from the Ascidian Synoicum prunum. J Nat Prod 2022; 85:441-452. [PMID: 35050597 DOI: 10.1021/acs.jnatprod.1c01172] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Seven new polyaromatic bis-spiroketal-containing butenolides, the prunolides D-I (4-9) and cis-prunolide C (10), a new dibrominated β-carboline sulfamate named pityriacitrin C (11), alongside the known prunolides A-C (1-3) were isolated from the Australian colonial ascidian Synoicum prunum. The prunolides D-G (4-7) represent the first asymmetrically brominated prunolides, while cis-prunolide C (10) is the first reported with a cis-configuration about the prunolide's bis-spiroketal core. The prunolides displayed binding activities with the Parkinson's disease-implicated amyloid protein α-synuclein in a mass spectrometry binding assay, while the prunolides (1-5 and 10) were found to significantly inhibit the aggregation (>89.0%) of α-synuclein in a ThT amyloid dye assay. The prunolides A-C (1-3) were also tested for inhibition of pSyn aggregate formation in a primary embryonic mouse midbrain dopamine neuron model with prunolide B (2) displaying statistically significant inhibitory activity at 0.5 μM. The antiplasmodial and antibacterial activities of the isolates were also examined with prunolide C (3) displaying only weak activity against the 3D7 parasite strain of Plasmodium falciparum. Our findings reported herein suggest that the prunolides could provide a novel scaffold for the exploration of future therapeutics aimed at inhibiting amyloid protein aggregation and the treatment of numerous neurodegenerative diseases.
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Affiliation(s)
- Darren C Holland
- School of Environment and Science, Griffith University, Southport, Queensland 4222, Australia
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland 4111, Australia
| | - Dale W Prebble
- School of Environment and Science, Griffith University, Southport, Queensland 4222, Australia
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland 4111, Australia
| | - Safak Er
- HiLIFE, Institute of Biotechnology, University of Helsinki, Helsinki 00014, Finland
- Faculty of Pharmacy, University of Helsinki, Helsinki 00014, Finland
| | - Joshua B Hayton
- School of Environment and Science, Griffith University, Southport, Queensland 4222, Australia
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland 4111, Australia
| | - Luke P Robertson
- School of Environment and Science, Griffith University, Southport, Queensland 4222, Australia
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland 4111, Australia
| | - Vicky M Avery
- School of Environment and Science, Griffith University, Southport, Queensland 4222, Australia
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland 4111, Australia
- Discovery Biology, Griffith University, Nathan, Queensland 4111, Australia
| | - Andrii Domanskyi
- HiLIFE, Institute of Biotechnology, University of Helsinki, Helsinki 00014, Finland
| | - Milton J Kiefel
- School of Environment and Science, Griffith University, Southport, Queensland 4222, Australia
- Institute for Glycomics, Griffith University, Southport, Queensland 4221, Australia
| | - John N A Hooper
- Queensland Museum, South Brisbane BC, Queensland 4101, Australia
| | - Anthony R Carroll
- School of Environment and Science, Griffith University, Southport, Queensland 4222, Australia
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland 4111, Australia
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6
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Safa N, Trobec T, Holland DC, Slazak B, Jacobsson E, Hawkes JA, Frangež R, Sepčić K, Göransson U, Moodie LWK, Robertson LP. Spatial Distribution and Stability of Cholinesterase Inhibitory Protoberberine Alkaloids from Papaver setiferum. J Nat Prod 2022; 85:215-224. [PMID: 34910498 PMCID: PMC8805119 DOI: 10.1021/acs.jnatprod.1c00980] [Citation(s) in RCA: 3] [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] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Indexed: 05/27/2023]
Abstract
During a research program to identify new cholinesterase inhibitors of natural origin, two new 7,8-didehydroprotoberberine alkaloids (1 and 2) and nine known compounds (3-11) were isolated from the capsules of the common ornamental poppy, Papaver setiferum (previously P. pseudo-orientale). Despite their reported instability, the 7,8-didehydroprotoberberines isolated herein appeared relatively stable, particularly as their trifluoroacetic acid salts. The spatial distributions of the isolated alkaloids were also analyzed using desorption electrospray ionization imaging mass spectrometry. The alkaloids were localized predominantly within the walls and vascular bundles of the capsules, with the highest relative abundances occurring in the lower half of the capsules toward the peduncle. The relative abundances of the alkaloids were also compared across plant development stages. Although most alkaloids did not show clear patterns in their concentration across development stages, the concentration of suspected oxidation products clearly spiked upon plant death. Finally, all isolated natural products were screened for inhibitory activities against a panel of cholinesterases, from both human and animal sources. These studies identified several competitive inhibitors of cholinesterases with potency in the low micromolar range (1-4, 6, 7), offering new lead compounds for the development of cholinesterase inhibitory drugs.
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Affiliation(s)
- Neda Safa
- Pharmacognosy,
Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala University, 75237 Uppsala, Sweden
- Drug
Design and Discovery, Department of Medicinal Chemistry, Biomedical
Centre, Uppsala University, 75123 Uppsala, Sweden
| | - Tomaž Trobec
- Institute
of Preclinical Sciences, Veterinary Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - Darren C. Holland
- School
of Environment and Science, Griffith University, Southport 4222, Gold Coast, Australia
- Griffith
Institute for Drug Discovery, Griffith University, 4111 Nathan, Australia
| | - Blazej Slazak
- Pharmacognosy,
Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala University, 75237 Uppsala, Sweden
- W.
Szafer Institute of Botany, Polish Academy
of Science, 46 Lubicz
Street, 31-512, Kraków, Poland
| | - Erik Jacobsson
- Pharmacognosy,
Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala University, 75237 Uppsala, Sweden
| | - Jeffrey A. Hawkes
- Analytical
Chemistry, Department of Chemistry, Biomedical Centre, Uppsala University, 75120 Uppsala, Sweden
| | - Robert Frangež
- Institute
of Preclinical Sciences, Veterinary Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - Kristina Sepčić
- Department
of Biology, Biotechnical Faculty, University
of Ljubljana, 1000 Ljubljana, Slovenia
| | - Ulf Göransson
- Pharmacognosy,
Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala University, 75237 Uppsala, Sweden
| | - Lindon W. K. Moodie
- Drug
Design and Discovery, Department of Medicinal Chemistry, Biomedical
Centre, Uppsala University, 75123 Uppsala, Sweden
- Uppsala
Antibiotic Centre, Biomedical Centre, Uppsala
University, 75123 Uppsala, Sweden
| | - Luke P. Robertson
- Pharmacognosy,
Department of Pharmaceutical Biosciences, Biomedical Centre, Uppsala University, 75237 Uppsala, Sweden
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7
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Robertson LP, Makwana V, Voser TM, Holland DC, Carroll AR. Leptanoine D, a New Quinoline Alkaloid from the Australian Tree Pitaviaster haplophyllus (Rutaceae). Aust J Chem 2021. [DOI: 10.1071/ch20125] [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: 11/23/2022]
Abstract
One new furoquinoline alkaloid, leptanoine D (1) and nine known alkaloids 2–10 were isolated from Pitaviaster haplophyllus. Leptanoine D (1) contains a typically unstable vinyl ether moiety and was structurally elucidated based on 2D NMR, (+)-HR-ESI-MS, and ECD data. The structures of the known furoquinoline alkaloids leptanoine A (11) and B (12) have also been revised. Compounds 1–10 were screened against three species of bacteria (Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli), however they showed no activity at the highest dose tested (32µg mL−1). The compounds were also evaluated for anti-proliferative action against PC-3 and WPMY-1 cells, with 7–9 displaying weak activity at 100μM.
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8
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Prebble DW, Holland DC, Robertson LP, Avery VM, Carroll AR. Citronamine A, an Antiplasmodial Isoquinoline Alkaloid from the Australian Marine Sponge Citronia astra. Org Lett 2020; 22:9574-9578. [PMID: 33232166 DOI: 10.1021/acs.orglett.0c03633] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Citronamine A (1), an isoquinoline alkaloid containing an unprecedented pentacyclic ring system, was isolated from the Australian marine sponge Citronia astra. Based on the combination of MS and NMR analyses and comparison of experimental and TDDFT calculated ECD spectra, the absolute structure of 1 was determined. Compound 1 displayed moderate activity against drug sensitive (3D7) and drug resistant (Dd2) strains of the parasite, Plasmodium falciparum, responsible for malaria.
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Affiliation(s)
- Dale W Prebble
- School of Environment and Science, Griffith University, Southport, Queensland 4222, Australia.,Environmental Futures Research Institute, Griffith University, Southport, Queensland 4222, Australia.,Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland 4111, Australia
| | - Darren C Holland
- School of Environment and Science, Griffith University, Southport, Queensland 4222, Australia.,Environmental Futures Research Institute, Griffith University, Southport, Queensland 4222, Australia
| | - Luke P Robertson
- School of Environment and Science, Griffith University, Southport, Queensland 4222, Australia.,Environmental Futures Research Institute, Griffith University, Southport, Queensland 4222, Australia
| | - Vicky M Avery
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland 4111, Australia.,Discovery Biology, Griffith University, Brisbane, Queensland 4111, Australia
| | - Anthony R Carroll
- School of Environment and Science, Griffith University, Southport, Queensland 4222, Australia.,Environmental Futures Research Institute, Griffith University, Southport, Queensland 4222, Australia.,Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland 4111, Australia
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9
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Bracegirdle J, Robertson LP, Hume PA, Page MJ, Sharrock AV, Ackerley DF, Carroll AR, Keyzers RA. Correction to Lamellarin Sulfates from the Pacific Tunicate Didemnum ternerratum. J Nat Prod 2020; 83:3213. [PMID: 32964710 DOI: 10.1021/acs.jnatprod.0c00997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
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10
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Robertson LP, Moodie LWK, Holland DC, Jandér KC, Göransson U. Sulfadiazine Masquerading as a Natural Product from Scilla madeirensis (Scilloideae). J Nat Prod 2020; 83:1305-1308. [PMID: 32208615 PMCID: PMC7307949 DOI: 10.1021/acs.jnatprod.0c00163] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Indexed: 06/10/2023]
Abstract
The structure of 2,4-(4'-aminobenzenamine)pyrimidine (1), a pyrimidine alkaloid previously isolated from the bulbs of Scilla madeirensis (Asparagaceae, synonym Autonoë madeirensis), has been revised. These conclusions were met via comparison of reported NMR and EIMS data with those obtained from synthetic standards. The corrected structure is the antibiotic sulfadiazine (2), which has likely been isolated as a contaminant from the site of collection. The reported bioactivity of 1 as an α1-adrenoceptor antagonist should instead be ascribed to sulfadiazine. Our findings appear to show another example of an anthropogenic contaminant being identified as a natural product and emphasize the importance of considering the biosynthetic origins of isolated compounds within a phylogenetic context.
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Affiliation(s)
- Luke P. Robertson
- Plant
Ecology and Evolution, Department of Ecology and Genetics, Evolutionary
Biology Centre, Uppsala University, 75236 Uppsala, Sweden
- Pharmacognosy,
Department of Medicinal Chemistry, Biomedical Centre, Uppsala University, 75123 Uppsala, Sweden
| | - Lindon W. K. Moodie
- Drug
Design and Discovery, Department of Medicinal Chemistry, Biomedical
Centre, Uppsala University, 75123 Uppsala, Sweden
- Uppsala
Antibiotic Centre, Uppsala University, 75123 Uppsala, Sweden
| | - Darren C. Holland
- Environmental
Futures Research Institute, Griffith University, Southport 4222, Gold Coast, Australia
| | - K. Charlotte Jandér
- Plant
Ecology and Evolution, Department of Ecology and Genetics, Evolutionary
Biology Centre, Uppsala University, 75236 Uppsala, Sweden
| | - Ulf Göransson
- Pharmacognosy,
Department of Medicinal Chemistry, Biomedical Centre, Uppsala University, 75123 Uppsala, Sweden
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11
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Abstract
Three new (1: -3: ) and 2 known (4: -5: ) bis-indole alkaloids were identified from the bark of Flindersia pimenteliana (Rutaceae). The structures of 1: -3: were elucidated on the basis of their (+)-HRESESIMS and 2D NMR spectroscopic data. Antiplasmodial activity for 1: -3: against chloroquine sensitive (3D7) and chloroquine-resistant (Dd2) Plasmodium falciparum is also reported, with IC50 values ranging from 0.96 to 2.41 µg/mL. These results expand our knowledge of the structure-activity relationships of potently antiplasmodial isoborreverine-type alkaloids, the bioactivity of which have recently attracted significant attention in the literature.
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Affiliation(s)
- Luke P Robertson
- Environmental Futures Research Institute, Griffith University, Southport, Gold Coast, Australia
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Australia
| | - Leonardo Lucantoni
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Australia
| | - Vicky M Avery
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Australia
| | - Anthony R Carroll
- Environmental Futures Research Institute, Griffith University, Southport, Gold Coast, Australia
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Australia
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12
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Jennings LK, Robertson LP, Rudolph KE, Munn AL, Carroll AR. Anti-prion Butenolides and Diphenylpropanones from the Australian Ascidian Polycarpa procera. J Nat Prod 2019; 82:2620-2626. [PMID: 31436981 DOI: 10.1021/acs.jnatprod.9b00551] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A library of 500 Australian marine invertebrate extracts was screened for anti-prion activity using a yeast-based assay, and this resulted in an extract from the ascidian Polycarpa procera showing potent activity. Purification of this extract led to the isolation of six new butenolide metabolites, the procerolides 1-4 and two related diphenylpropanones, the procerones 5 and 6, as the bioactive components. The structures of 1-6 were elucidated from the analysis of 1D/2D NMR and MS data, and their absolute configurations determined from comparison of experimental and computed ECD data. Compounds 1-6 were tested for anti-prion activity in a yeast-based assay, and 1 and 5 displayed potent bioactivity (EC50 of 23 and 29 μM, respectively) comparable to the potently active anti-prion compound guanabenz. The procerolides and procerones are the first anti-prion compounds to be reported from ascidians, indicating that ascidians may be an untapped source of new lead anti-prion compounds.
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Affiliation(s)
- Laurence K Jennings
- Environmental Futures Research Institute , Griffith University (Gold Coast campus) , Parklands Drive , Southport , QLD 4222 , Australia
- School of Environment and Science , Griffith University (Gold Coast campus) , Parklands Drive , Southport , QLD 4222 , Australia
| | - Luke P Robertson
- Environmental Futures Research Institute , Griffith University (Gold Coast campus) , Parklands Drive , Southport , QLD 4222 , Australia
- School of Environment and Science , Griffith University (Gold Coast campus) , Parklands Drive , Southport , QLD 4222 , Australia
| | - Kathryn E Rudolph
- School of Environment and Science , Griffith University (Gold Coast campus) , Parklands Drive , Southport , QLD 4222 , Australia
| | - Alan L Munn
- Menzies Health Institute Queensland , Griffith University (Gold Coast campus) , Parklands Drive , Southport , QLD 4222 , Australia
| | - Anthony R Carroll
- Environmental Futures Research Institute , Griffith University (Gold Coast campus) , Parklands Drive , Southport , QLD 4222 , Australia
- School of Environment and Science , Griffith University (Gold Coast campus) , Parklands Drive , Southport , QLD 4222 , Australia
- Griffith Institute for Drug Discovery , Griffith University (Brisbane Innovation Park) , Don Young Road , Nathan , QLD 4111 , Australia
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13
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Bracegirdle J, Robertson LP, Hume PA, Page MJ, Sharrock AV, Ackerley DF, Carroll AR, Keyzers RA. Lamellarin Sulfates from the Pacific Tunicate Didemnum ternerratum. J Nat Prod 2019; 82:2000-2008. [PMID: 31306000 DOI: 10.1021/acs.jnatprod.9b00493] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Six new lamellarin sulfates (1-6) were isolated from the methanolic extract of the Pacific tunicate Didemnum ternerratum, collected from the Kingdom of Tonga. Mass spectrometric molecular networking through the GNPS platform was used to target the isolation of 1-6. Planar structures were elucidated through a combination of NMR and MS experiments. Through comparison of experimental and calculated ECD spectra, the absolute configurations of atropisomers 2-5 were determined, with their energetic barriers to racemization also determined computationally. The cytotoxicity of the compounds was tested against the human colon carcinoma cell line HCT-116, where lamellarin D-8-sulfate (5) exhibited moderate activity with an IC50 of 9.7 μM.
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Affiliation(s)
| | - Luke P Robertson
- Environmental Futures Research Institute , Griffith University , Southport 4222 , Gold Coast , Australia
- Griffith Institute for Drug Discovery , Griffith University , Nathan 4111 , Brisbane , Australia
| | | | - Michael J Page
- National Institute of Water & Atmospheric Research (NIWA) , P.O. Box 893, Nelson , New Zealand
| | | | | | - Anthony R Carroll
- Environmental Futures Research Institute , Griffith University , Southport 4222 , Gold Coast , Australia
- Griffith Institute for Drug Discovery , Griffith University , Nathan 4111 , Brisbane , Australia
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Abstract
A new oxidized xanthene, acrotrione (1), and two known acetophenones (2 and 3) were isolated from a methanol extract of the roots of Acronychia pubescens. The structure of 1 was elucidated on the basis of its (+)-HRESIMS, 2D NMR, and ECD data. Acritrione (1) contains an unusual oxidized furo[2,3- c]xanthene moiety that has not been previously reported. Moderate antiplasmodial activity for these natural products against chloroquine-sensitive (3D7) and chloroquine-resistant (Dd2) Plasmodium falciparum was determined with IC50 values ranging from 1.7 to 4.7 μM.
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Affiliation(s)
- Luke P Robertson
- Environmental Futures Research Institute , Griffith University , Gold Coast Campus , Southport 4222 , Australia
- Griffith Institute for Drug Discovery , Griffith University , Nathan Campus , Brisbane 4111 , Australia
| | - Leonardo Lucantoni
- Griffith Institute for Drug Discovery , Griffith University , Nathan Campus , Brisbane 4111 , Australia
| | - Sandra Duffy
- Griffith Institute for Drug Discovery , Griffith University , Nathan Campus , Brisbane 4111 , Australia
| | - Vicky M Avery
- Griffith Institute for Drug Discovery , Griffith University , Nathan Campus , Brisbane 4111 , Australia
| | - Anthony R Carroll
- Environmental Futures Research Institute , Griffith University , Gold Coast Campus , Southport 4222 , Australia
- Griffith Institute for Drug Discovery , Griffith University , Nathan Campus , Brisbane 4111 , Australia
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15
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Senadeera SPD, Robertson LP, Duffy S, Wang Y, Avery VM, Carroll AR. β-Triketone-Monoterpene Hybrids from the Flowers of the Australian Tree Corymbia intermedia. J Nat Prod 2018; 81:2455-2461. [PMID: 30398871 DOI: 10.1021/acs.jnatprod.8b00494] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Four new β-triketone monoterpene hybrids, intermediones A-D (1-4), have been identified from the flowers of the Australian eucalypt tree Corymbia intermedia. Intermediones A-D are β-triketones that incorporate a pinene moiety attached via a benzyl group to a syncarpic acid. The structures of 1-4, including relative configurations, were elucidated from the analysis of 1D/2D NMR and MS data. The absolute configurations of intermediones A and B were determined by comparison of experimental and predicted ECD spectra. Intermedione D possesses a tetracyclic ring system that is related to that found in the meroterpenes, guadials B and C. Low to moderate antiplasmodial activity toward the chloroquine-sensitive (3D7) strain of Plasmodium falciparum, with IC50 values ranging from 9.9 to 20.8 μM, was observed for intermediones A, B, and D.
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Affiliation(s)
- Sarath P D Senadeera
- Environmental Futures Research Institute , Griffith University , Gold Coast , QLD 4222 , Australia
- Griffith Institute for Drug Discovery , Griffith University , Brisbane , QLD 4111 , Australia
| | - Luke P Robertson
- Environmental Futures Research Institute , Griffith University , Gold Coast , QLD 4222 , Australia
- Griffith Institute for Drug Discovery , Griffith University , Brisbane , QLD 4111 , Australia
| | - Sandra Duffy
- Griffith Institute for Drug Discovery , Griffith University , Brisbane , QLD 4111 , Australia
| | - Yun Wang
- Environmental Futures Research Institute , Griffith University , Gold Coast , QLD 4222 , Australia
| | - Vicky M Avery
- Griffith Institute for Drug Discovery , Griffith University , Brisbane , QLD 4111 , Australia
| | - Anthony R Carroll
- Environmental Futures Research Institute , Griffith University , Gold Coast , QLD 4222 , Australia
- Griffith Institute for Drug Discovery , Griffith University , Brisbane , QLD 4111 , Australia
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16
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Robertson LP, Hall CR, Forster PI, Carroll AR. Alkaloid diversity in the leaves of Australian Flindersia (Rutaceae) species driven by adaptation to aridity. Phytochemistry 2018; 152:71-81. [PMID: 29734038 DOI: 10.1016/j.phytochem.2018.04.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 04/06/2018] [Accepted: 04/22/2018] [Indexed: 06/08/2023]
Abstract
The genus Flindersia (Rutaceae) comprises 17 species of mostly Australian endemic trees. Although most species are restricted to rainforests, four have evolved to grow in semi-arid and arid environments. In this study, the leaf alkaloid diversity of rainforest and semi-arid/arid zone adapted Australian Flindersia were compared by LC/MS-MS and NMR spectroscopy. Contrary to expectations, Flindersia alkaloid diversity was strongly correlated with environmental aridity, where species predominating in drier regions produced more alkaloids than their wet rainforest congenerics. Rainforest species were also more chemically similar to each other than were the four semi-arid/arid zone species. There was a significant relationship between the presence of alkaloid structural classes and phylogenetic distance, suggesting that alkaloid profiles are influenced by both genetic and environmental factors. The results suggest that the radiation of Flindersia species out of the rainforest and into drier environments has promoted the evolution of unique alkaloid diversity. Plants growing in arid and semi-arid regions of Australia may represent an untapped source of undescribed specialised metabolites.
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Affiliation(s)
- Luke P Robertson
- Environmental Futures Research Institute, Griffith University, Southport 4222, Gold Coast, Australia; Griffith Institute for Drug Discovery, Griffith University, Nathan 4111, Brisbane, Australia
| | - Casey R Hall
- Hawkesbury Institute for the Environment, Western Sydney University, Richmond 2753, Australia
| | - Paul I Forster
- Queensland Herbarium, Department of Science, Information Technology, Innovation and the Arts, Brisbane Botanic Gardens, Toowong 4066, Queensland, Australia
| | - Anthony R Carroll
- Environmental Futures Research Institute, Griffith University, Southport 4222, Gold Coast, Australia; Griffith Institute for Drug Discovery, Griffith University, Nathan 4111, Brisbane, Australia.
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17
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Buedenbender L, Robertson LP, Lucantoni L, Avery VM, Kurtböke Dİ, Carroll AR. HSQC-TOCSY Fingerprinting-Directed Discovery of Antiplasmodial Polyketides from the Marine Ascidian-Derived Streptomyces sp. (USC-16018). Mar Drugs 2018; 16:md16060189. [PMID: 29849004 PMCID: PMC6025042 DOI: 10.3390/md16060189] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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: 05/08/2018] [Revised: 05/18/2018] [Accepted: 05/22/2018] [Indexed: 12/17/2022] Open
Abstract
Chemical investigations on the fermentation extract obtained from an ascidian-derived Streptomyces sp. (USC-16018) yielded a new ansamycin polyketide, herbimycin G (1), as well as a known macrocyclic polyketide, elaiophylin (2), and four known diketopiperazines (3–6). The structures of the compounds were elucidated based on 1D/2D NMR and MS data. The absolute configuration of 1 was established by comparison of experimental and predicted electronic circular dichroism (ECD) data. Antiplasmodial activities were tested for the natural products against chloroquine sensitive (3D7) and chloroquine resistant (Dd2) Plasmodium falciparum strains; the two polyketides (1–2) demonstrated an inhibition of >75% against both parasite strains and while 2 was highly cytotoxic, herbimycin G (1) showed no cytotoxicity and good predicted water solubility.
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Affiliation(s)
- Larissa Buedenbender
- Environmental Futures Research Institute, School of Environment and Science, Griffith University, Gold Coast Campus, QLD 4222, Australia.
| | - Luke P Robertson
- Environmental Futures Research Institute, School of Environment and Science, Griffith University, Gold Coast Campus, QLD 4222, Australia.
- Griffith Institute for Drug Discovery, Griffith University, Brisbane, QLD 4111, Australia.
| | - Leonardo Lucantoni
- Griffith Institute for Drug Discovery, Griffith University, Brisbane, QLD 4111, Australia.
| | - Vicky M Avery
- Griffith Institute for Drug Discovery, Griffith University, Brisbane, QLD 4111, Australia.
| | - D İpek Kurtböke
- GeneCology Research Centre, Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Maroochydore, QLD 4558, Australia.
| | - Anthony R Carroll
- Environmental Futures Research Institute, School of Environment and Science, Griffith University, Gold Coast Campus, QLD 4222, Australia.
- Griffith Institute for Drug Discovery, Griffith University, Brisbane, QLD 4111, Australia.
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18
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Robertson LP, Duffy S, Wang Y, Wang D, Avery VM, Carroll AR. Pimentelamines A-C, Indole Alkaloids Isolated from the Leaves of the Australian Tree Flindersia pimenteliana. J Nat Prod 2017; 80:3211-3217. [PMID: 29236492 DOI: 10.1021/acs.jnatprod.7b00587] [Citation(s) in RCA: 15] [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: 06/07/2023]
Abstract
Three members of a new class of ascorbic acid-adduct indole alkaloids (1-3), a new prenylated indole alkaloid (4), and five known compounds (5-9) were isolated from the leaves of Flindersia pimenteliana. The structures of 1-4 were elucidated on the basis of their (+)-HRESIMS and 2D NMR spectroscopic data. Antiplasmodial activity was also reported for the natural products against chloroquine-sensitive (3D7) and chloroquine-resistant (Dd2) Plasmodium falciparum with IC50 values ranging from 0.19 to 3.6 μM.
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Affiliation(s)
- Luke P Robertson
- Environmental Futures Research Institute, Griffith University , Southport 4222, Gold Coast, Australia
- Griffith Institute for Drug Discovery, Griffith University , Nathan 4111, Brisbane, Australia
| | - Sandra Duffy
- Griffith Institute for Drug Discovery, Griffith University , Nathan 4111, Brisbane, Australia
| | - Yun Wang
- Centre for Clean Environment and Energy, Griffith University , Southport 4222, Gold Coast, Australia
| | - Dongdong Wang
- Griffith Institute for Drug Discovery, Griffith University , Nathan 4111, Brisbane, Australia
| | - Vicky M Avery
- Griffith Institute for Drug Discovery, Griffith University , Nathan 4111, Brisbane, Australia
| | - Anthony R Carroll
- Environmental Futures Research Institute, Griffith University , Southport 4222, Gold Coast, Australia
- Griffith Institute for Drug Discovery, Griffith University , Nathan 4111, Brisbane, Australia
- Centre for Clean Environment and Energy, Griffith University , Southport 4222, Gold Coast, Australia
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19
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Robertson LP, McDonagh JE, Southwood TR, Shaw KL. Growing up and moving on. A multicentre UK audit of the transfer of adolescents with juvenile idiopathic arthritis from paediatric to adult centred care. Ann Rheum Dis 2006; 65:74-80. [PMID: 15994281 PMCID: PMC1797966 DOI: 10.1136/ard.2004.032292] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [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] [Accepted: 06/14/2005] [Indexed: 12/17/2022]
Abstract
OBJECTIVE To assess the provisions made for the transfer of adolescents with juvenile idiopathic arthritis to adult rheumatology clinics in the UK and the impact of a transitional care programme. METHODS An audit of the documentation of the provisions made for transfer in 10 centres participating in a controlled trial of transitional care. Each centre conducted a retrospective case note audit of the recent patients transferred to adult care before and 12-24 months after the start of the trial. Demographic details, age when transition was first discussed, age at transfer, transitional issues, multidisciplinary team involvement, adolescent self advocacy, and readiness were documented. RESULTS There were improvements at follow up in documentation of transitional issues, disease specific educational needs, adolescent readiness, and parental needs with the exception of dental care, dietary calcium, and home exercise programmes. The age at which the concept of an independent clinic visit was introduced was lower (mean (SD): 16.8 (1.06) v 15.8 (1.46) years, p = 0.01) but there were no other changes in age related transitional milestones. Significantly more participants had preparatory visits to the adult clinic, had a transition plan, and had joint injections while awake at follow up. CONCLUSIONS The improvement in documentation suggests that involvement in the research project increased awareness of transitional issues. The difficulty of changing policy into practice was highlighted, with room for improvement, particularly at the paediatric/adult interface. The reasons for this are likely to be multiple, including resources and lack of specific training.
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Robertson LP, Davis MJ. A longitudinal study of disease activity and functional status in a hospital cohort of patients with ankylosing spondylitis. Rheumatology (Oxford) 2004; 43:1565-8. [PMID: 15353608 DOI: 10.1093/rheumatology/keh386] [Citation(s) in RCA: 50] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE To evaluate changes in functional status and disease activity and their determinants in patients with ankylosing spondylitis (AS) attending hospital, using the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) and the Bath Ankylosing Spondylitis Functional Index (BASFI). METHODS Patients completed BASDAI and BASFI questionnaires annually from 1996 to 2001. Demographic and clinical data were collected. The mean first and last recorded scores were compared. The change per year and area under the curve per year for the BASDAI and BASFI were calculated. Relationships between demographic, clinical and longitudinal BASDAI/BASFI data were examined. Subgroup analyses were performed using the cross-sectional and longitudinal data. RESULTS Two hundred and seventy-nine BASDAI and 322 BASFI questionnaires were analysed. The BASFI increased [mean change 6.15, 95% confidence interval (CI) 1.9, 10.3, P = 0.005] but the BASDAI did not (mean change 0.87, 95% CI -3.96, 5.7, P = 0.71). First recorded scores were the best predictors of the cumulative scores per year. Patients with peripheral joint (P = 0.01) and hip (P<0.001) disease had higher mean BASFI scores. Males (P<0.001) and patients with spinal disease alone (P = 0.0014), iritis (P = 0.005) and late-onset AS (P = 0.002) became more functionally impaired over time. CONCLUSIONS Disease activity in this AS cohort remained relatively constant but there was functional decline. Initial BASDAI/FI can predict a severe disease course. PJD patients with peripheral joint disease were more functionally impaired, but deteriorated less than spinal disease alone patients. Iritis and late onset disease may be severity markers for functional impairment.
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Abstract
OBJECTIVES To evaluate the effect of minocycline as treatment for cutaneous calcinosis in limited cutaneous systemic sclerosis (lcSSc). METHODS Patients with lcSSc who had cutaneous calcinosis causing pain or ulceration, or both, were prescribed minocycline 50 or 100 mg daily regularly in an open label manner between November 1994 and April 2000. At routine clinical follow up the appearance of the calcinosis deposits was assessed clinically and radiographically, and the patients' assessment of the degree of discomfort, size, and frequency of ulceration was recorded. Demographic data, including disease duration, clinical features, and antinuclear antibody (ANA) titres, were also recorded. RESULTS Nine patients have been treated to date. Eight of the nine patients were ANA positive, five of whom were positive for anticentromere antibodies. Eight patients have shown definite improvement and seven patients continue to receive treatment. The frequency of ulceration and inflammation associated with the calcinosis deposits decreased with treatment. The size of the calcinosis deposits also decreased but was less dramatic than expected. Improvement occurred at the earliest after one month of treatment with a mean (SD) of 4.8 (3.8) months. The mean (SD) length of treatment was 3.5 (1.9) years. An unexpected effect was the darkening of the calcinosis deposits to a blue/black colour. CONCLUSIONS Minocycline may be effective in the control of calcinosis in systemic sclerosis. A low dose only is required and appears to be generally well tolerated. The mechanism of action may be mainly through inhibition of matrix metalloproteinases and anti-inflammatory effects. Calcium binding properties and antibacterial actions may also have a role.
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Affiliation(s)
- L P Robertson
- Department of Rheumatology, Royal Cornwall Hospital, Truro, UK.
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22
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Robertson LP, Hickling P. Chronic recurrent multifocal osteomyelitis is a differential diagnosis of juvenile idiopathic arthritis. Ann Rheum Dis 2001; 60:828-31. [PMID: 11502607 PMCID: PMC1753836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Affiliation(s)
- L P Robertson
- Department of Rheumatology, Derriford Hospital, Derriford Road, Plymouth PL6 8DH, Devon, UK.
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Affiliation(s)
- L P Robertson
- Department of Rheumatology, Derriford Hospital, Plymouth, United Kingdom.
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25
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Abstract
We describe a 54-year-old woman with long-standing rheumatoid arthritis complicated by Felty's syndrome and lung involvement who developed generalized morphoea with no features of systemic sclerosis. To our knowledge this is the first description of such a case.
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Affiliation(s)
- L P Robertson
- Department of Rheumatology, Derriford Hospital, Plymouth, UK.
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Amsler C, Bugg DV, Axen D, Beveridge J, Clough AS, Dubois R, Edgington JA, Gibson D, Keeler R, Ludgate GA, Oram CJ, Richardson JR, Robertson LP, Stewart NM. The normalisation of pp polarisation between 200 and 520 MeV. ACTA ACUST UNITED AC 1999. [DOI: 10.1088/0305-4616/4/7/012] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [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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Riedlberger J, Amsler C, Doser M, Straumann U, Truöl P, Bailey D, Barlag S, Gastaldi U, Landua R, Sabev C, Duch KD, Heel M, Kalinowsky H, Kayser F, Klempt E, May B, Schreiber O, Weidenauer P, Ziegler M, Dahme W, Feld-Dahme F, Schaefer U, Wodrich WR, Ahmad S, Bizot JC, Delcourt B, Jeanjean J, Nguyen H, Prevot N, Auld EG, Axen DA, Erdman KL, Howard B, Howard R, White BL, Comyn M, Beer G, Marshall GM, Robertson LP, Botlo M, Laa C, Vonach H. Antiproton annihilation at rest in nitrogen and deuterium gas. Phys Rev C Nucl Phys 1989; 40:2717-2731. [PMID: 9966282 DOI: 10.1103/physrevc.40.2717] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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