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Magny R, Beauxis Y, Genta-Jouve G, Bourgogne E. Application of a molecular networking approach using LC-HRMS combined with the MetWork webserver for clinical and forensic toxicology. Heliyon 2024; 10:e36735. [PMID: 39286100 PMCID: PMC11402778 DOI: 10.1016/j.heliyon.2024.e36735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 08/16/2024] [Accepted: 08/21/2024] [Indexed: 09/19/2024] Open
Abstract
Backgrounds and aims In toxicology, LC-HRMS for untargeted screening yields a great deal of high quality spectral data. However, there we lack tools to visualize/organize the MS data. We applied molecular networking (MN) to untargeted screening interpretation. Our aims were to compare theoretical MS libraries obtained in silico with our experimental dataset in patients to broaden its application, and to use the MetWork web application for metabolite identification. Methods Samples were analyzed using an LC-HRMS system. For MN, data was generated using MZmine, and analyzed and visualized using MetGem. MetWork annotations were filtered and this file was used for annotation of the previously obtained MN. Results 155 compounds including drugs found in patients were recorded. Using this dataset, we confirmed in 60 patients intake of tramadol, amitriptyline bromazepam, and cocaine. The results obtained by the reference methods were confirmed by MN approaches. Eighty percent of the compounds were common to both conventional and MN approaches. Using MetWork, metabolites and parent drugs such as amitriptyline, its metabolite nortriptyline and amitriptyline glucuronide phase 2 metabolites were anticipated and proposed as putative annotations. Conclusion The workflow increases confidence in toxicological screening by highlighting putative structures in biological matrices in combination with CFM-ID (Competitive Fragmentation Modeling for Metabolite Identification) and MetWork to extend the annotation of potential drugs even without a reference standard.
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Affiliation(s)
- Romain Magny
- Laboratoire de Toxicologie, Fédération de Toxicologie, AP-HP, Hôpital Lariboisière, 75006, Paris, France
- Université Paris Cité, CNRS, CiTCoM, 75006, Paris, France
| | - Yann Beauxis
- Université Paris Cité, Faculté de santé, Laboratoire de toxicologie, 75006, Paris, France
| | | | - Emmanuel Bourgogne
- Université Paris Cité, Faculté de santé, Laboratoire de toxicologie, 75006, Paris, France
- Laboratoire de Pharmacologie, AP-HP, Hôpital Bichat, 75018, Paris, France
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Nunes CDJ, Santos CC, Soares EN, Lima IS, Alves UV, Lanna E, Batista R, do Nascimento RP, Costa SL. Methanolic Extract and Brominated Compound from the Brazilian Marine Sponge Aplysina fulva Are Neuroprotective and Modulate Inflammatory Profile of Microglia. Mar Drugs 2024; 22:235. [PMID: 38921546 PMCID: PMC11204514 DOI: 10.3390/md22060235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Revised: 05/13/2024] [Accepted: 05/14/2024] [Indexed: 06/27/2024] Open
Abstract
Neurodegenerative diseases involve neuroinflammation and a loss of neurons, leading to disability and death. Hence, the research into new therapies has been focused on the modulation of the inflammatory response mainly by microglia/macrophages. The extracts and metabolites of marine sponges have been presented as anti-inflammatory. This study evaluated the toxicity of an extract and purified compound from the Brazilian marine sponge Aplysina fulva as well as its neuroprotection against inflammatory damage associated with the modulation of microglia response. PC12 neuronal cells and neonatal rat microglia were treated with the methanolic extract of A. fulva (AF-MeOH, 0.1-200 μg/mL) or with its purified dimethyl ketal of 3,5-dibromoverongiaquinol (AF-H1, 0.1-100 μM). Cytotoxicity was determined by MTT tetrazolium, Trypan blue, and propidium iodide; microglia were also treated with the conditioned medium (CM) from PC12 cells in different conditions. The microglia phenotype was determined by the expression of Iba-1 and CD68. AF-MeOH and AF-H1 were not toxic to PC12 or the microglia. Inflammatory damage with Escherichia coli lipopolysaccharide (LPS, 5 μg/mL) was not observed in the PC12 cells treated with AF-MeOH (1-10 μg/mL) or AF-H1 (1-10 μM). Microglia subjected to the CM from PC12 cells treated with LPS and AF-MeOH or AF-H1 showed the control phenotype-like (multipolar, low-CD68), highlighting the anti-neuroinflammatory and neuroprotective effect of components of this marine sponge.
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Affiliation(s)
- Catarina de Jesus Nunes
- Laboratory of Neurochemistry and Cell Biology (LabNq), Department of Biochemistry and Biophysics, Institute of Science and Health, Federal University of Bahia, Salvador 40231-300, Bahia, Brazil; (C.d.J.N.); (C.C.S.); (E.N.S.); (I.S.L.); (R.P.d.N.)
| | - Cinthia Cristina Santos
- Laboratory of Neurochemistry and Cell Biology (LabNq), Department of Biochemistry and Biophysics, Institute of Science and Health, Federal University of Bahia, Salvador 40231-300, Bahia, Brazil; (C.d.J.N.); (C.C.S.); (E.N.S.); (I.S.L.); (R.P.d.N.)
| | - Erica Novaes Soares
- Laboratory of Neurochemistry and Cell Biology (LabNq), Department of Biochemistry and Biophysics, Institute of Science and Health, Federal University of Bahia, Salvador 40231-300, Bahia, Brazil; (C.d.J.N.); (C.C.S.); (E.N.S.); (I.S.L.); (R.P.d.N.)
| | - Irlã Santos Lima
- Laboratory of Neurochemistry and Cell Biology (LabNq), Department of Biochemistry and Biophysics, Institute of Science and Health, Federal University of Bahia, Salvador 40231-300, Bahia, Brazil; (C.d.J.N.); (C.C.S.); (E.N.S.); (I.S.L.); (R.P.d.N.)
| | - Uesley Vieira Alves
- Laboratory of Research in Bioactive Substances (LAPESBI), Department of Organic Chemistry, Institute of Chemistry, Federal University of Bahia, Salvador 40170-115, Bahia, Brazil; (U.V.A.); (R.B.)
| | - Emílio Lanna
- Biology Institute, Federal University of Bahia, Salvador 40170-115, Bahia, Brazil;
| | - Ronan Batista
- Laboratory of Research in Bioactive Substances (LAPESBI), Department of Organic Chemistry, Institute of Chemistry, Federal University of Bahia, Salvador 40170-115, Bahia, Brazil; (U.V.A.); (R.B.)
| | - Ravena Pereira do Nascimento
- Laboratory of Neurochemistry and Cell Biology (LabNq), Department of Biochemistry and Biophysics, Institute of Science and Health, Federal University of Bahia, Salvador 40231-300, Bahia, Brazil; (C.d.J.N.); (C.C.S.); (E.N.S.); (I.S.L.); (R.P.d.N.)
| | - Silvia Lima Costa
- Laboratory of Neurochemistry and Cell Biology (LabNq), Department of Biochemistry and Biophysics, Institute of Science and Health, Federal University of Bahia, Salvador 40231-300, Bahia, Brazil; (C.d.J.N.); (C.C.S.); (E.N.S.); (I.S.L.); (R.P.d.N.)
- National Institute of Translational Neuroscience, Rio de Janeiro 21941-902, Rio de Janeiro, Brazil
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3
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Rivai B, Umar AK. Neuroprotective compounds from marine invertebrates. BENI-SUEF UNIVERSITY JOURNAL OF BASIC AND APPLIED SCIENCES 2023; 12:71. [DOI: 10.1186/s43088-023-00407-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 07/22/2023] [Indexed: 09/01/2023] Open
Abstract
Abstract
Background
Neuroinflammation is a key pathological feature of a wide variety of neurological disorders, including Parkinson’s, multiple sclerosis, Alzheimer’s, and Huntington’s disease. While current treatments for these disorders are primarily symptomatic, there is a growing interest in developing new therapeutics that target the underlying neuroinflammatory processes.
Main body
Marine invertebrates, such as coral, sea urchins, starfish, sponges, and sea cucumbers, have been found to contain a wide variety of biologically active compounds that have demonstrated potential therapeutic properties. These compounds are known to target various key proteins and pathways in neuroinflammation, including 6-hydroxydopamine (OHDH), caspase-3 and caspase-9, p-Akt, p-ERK, p-P38, acetylcholinesterase (AChE), amyloid-β (Aβ), HSF-1, α-synuclein, cellular prion protein, advanced glycation end products (AGEs), paraquat (PQ), and mitochondria DJ-1.
Short conclusion
This review focuses on the current state of research on the neuroprotective effects of compounds found in marine invertebrates and the potential therapeutic implications of these findings for treating neuroinflammatory disorders. We also discussed the challenges and limitations of using marine-based compounds as therapeutics, such as sourcing and sustainability concerns, and the need for more preclinical and clinical studies to establish their efficacy and safety.
Graphical abstract
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4
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Hu D, Jin Y, Hou X, Zhu Y, Chen D, Tai J, Chen Q, Shi C, Ye J, Wu M, Zhang H, Lu Y. Application of Marine Natural Products against Alzheimer's Disease: Past, Present and Future. Mar Drugs 2023; 21:md21010043. [PMID: 36662216 PMCID: PMC9867307 DOI: 10.3390/md21010043] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 12/12/2022] [Accepted: 12/30/2022] [Indexed: 01/08/2023] Open
Abstract
Alzheimer's disease (AD), a neurodegenerative disease, is one of the most intractable illnesses which affects the elderly. Clinically manifested as various impairments in memory, language, cognition, visuospatial skills, executive function, etc., the symptoms gradually aggravated over time. The drugs currently used clinically can slow down the deterioration of AD and relieve symptoms but cannot completely cure them. The drugs are mainly acetylcholinesterase inhibitors (AChEI) and non-competitive N-methyl-D-aspartate receptor (NDMAR) antagonists. The pathogenesis of AD is inconclusive, but it is often associated with the expression of beta-amyloid. Abnormal deposition of amyloid and hyperphosphorylation of tau protein in the brain have been key targets for past, current, and future drug development for the disease. At present, researchers are paying more and more attention to excavate natural compounds which can be effective against Alzheimer's disease and other neurodegenerative pathologies. Marine natural products have been demonstrated to be the most prospective candidates of these compounds, and some have presented significant neuroprotection functions. Consequently, we intend to describe the potential effect of bioactive compounds derived from marine organisms, including polysaccharides, carotenoids, polyphenols, sterols and alkaloids as drug candidates, to further discover novel and efficacious drug compounds which are effective against AD.
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Affiliation(s)
- Di Hu
- Collaborative Innovation Center of Seafood Deep Processing, Key Laboratory of Aquatic Products Processing of Zhejiang Province, Institute of Seafood, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Yating Jin
- Collaborative Innovation Center of Seafood Deep Processing, Key Laboratory of Aquatic Products Processing of Zhejiang Province, Institute of Seafood, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Xiangqi Hou
- Hangzhou WeChampion Biotech. Inc., Hangzhou 310030, China
| | - Yinlong Zhu
- Zhejiang Chiral Medicine Chemicals Co., Ltd., Hangzhou 311227, China
| | - Danting Chen
- Collaborative Innovation Center of Seafood Deep Processing, Key Laboratory of Aquatic Products Processing of Zhejiang Province, Institute of Seafood, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Jingjing Tai
- Collaborative Innovation Center of Seafood Deep Processing, Key Laboratory of Aquatic Products Processing of Zhejiang Province, Institute of Seafood, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Qianqian Chen
- Collaborative Innovation Center of Seafood Deep Processing, Key Laboratory of Aquatic Products Processing of Zhejiang Province, Institute of Seafood, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Cui Shi
- Collaborative Innovation Center of Seafood Deep Processing, Key Laboratory of Aquatic Products Processing of Zhejiang Province, Institute of Seafood, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Jing Ye
- Collaborative Innovation Center of Seafood Deep Processing, Key Laboratory of Aquatic Products Processing of Zhejiang Province, Institute of Seafood, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Mengxu Wu
- Hangzhou WeChampion Biotech. Inc., Hangzhou 310030, China
| | - Hong Zhang
- Hangzhou WeChampion Biotech. Inc., Hangzhou 310030, China
| | - Yanbin Lu
- Collaborative Innovation Center of Seafood Deep Processing, Key Laboratory of Aquatic Products Processing of Zhejiang Province, Institute of Seafood, Zhejiang Gongshang University, Hangzhou 310012, China
- Correspondence: ; Tel.: +86-571-87103135
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Gribble GW. Naturally Occurring Organohalogen Compounds-A Comprehensive Review. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 2023; 121:1-546. [PMID: 37488466 DOI: 10.1007/978-3-031-26629-4_1] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
Abstract
The present volume is the third in a trilogy that documents naturally occurring organohalogen compounds, bringing the total number-from fewer than 25 in 1968-to approximately 8000 compounds to date. Nearly all of these natural products contain chlorine or bromine, with a few containing iodine and, fewer still, fluorine. Produced by ubiquitous marine (algae, sponges, corals, bryozoa, nudibranchs, fungi, bacteria) and terrestrial organisms (plants, fungi, bacteria, insects, higher animals) and universal abiotic processes (volcanos, forest fires, geothermal events), organohalogens pervade the global ecosystem. Newly identified extraterrestrial sources are also documented. In addition to chemical structures, biological activity, biohalogenation, biodegradation, natural function, and future outlook are presented.
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Affiliation(s)
- Gordon W Gribble
- Department of Chemistry, Dartmouth College, Hanover, NH, 03755, USA.
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Kerbs A, Burgardt A, Veldmann KH, Schäffer T, Lee JH, Wendisch VF. Fermentative production of halogenated tryptophan derivatives with Corynebacterium glutamicum overexpressing tryptophanase or decarboxylase genes. Chembiochem 2022; 23:e202200007. [PMID: 35224830 PMCID: PMC9315010 DOI: 10.1002/cbic.202200007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 02/25/2022] [Indexed: 11/24/2022]
Abstract
The aromatic amino acid l‐tryptophan serves as a precursor for many valuable compounds such as neuromodulators, indoleamines and indole alkaloids. In this work, tryptophan biosynthesis was extended by halogenation followed by decarboxylation to the respective tryptamines or cleavage to the respective indoles. Either the tryptophanase genes tnaAs from E. coli and Proteus vulgaris or the aromatic amino acid decarboxylase genes AADCs from Bacillus atrophaeus, Clostridium sporogenes, and Ruminococcus gnavus were expressed in Corynebacterium glutamicum strains producing (halogenated) tryptophan. Regarding indoles, final titers of 16 mg L−1 7‐Cl‐indole and 23 mg L−1 7‐Br‐indole were attained. Tryptamine production led to a much higher titer of 2.26 g L−1 upon expression of AADC from B. atrophaeus. AADC enzymes were shown to be active with halogenated tryptophan in vitro and in vivo and supported production of 0.36 g L−1 7‐Br‐tryptamine with a volumetric productivity of 8.3 mg L−1 h−1 in a fed‐batch fermentation.
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Affiliation(s)
- Anastasia Kerbs
- Bielefeld University: Universitat Bielefeld, Genetics of Prokaryotes, GERMANY
| | - Arthur Burgardt
- Bielefeld University: Universitat Bielefeld, Genetics of Prokaryotes, GERMANY
| | - Kareen H Veldmann
- Bielefeld University: Universitat Bielefeld, Genetisc of Prokaryotes, GERMANY
| | - Thomas Schäffer
- Bielefeld University: Universitat Bielefeld, Fermentation Technology, GERMANY
| | - Jin-Ho Lee
- Kyungsung University, Food Science and Biotechnology, KOREA, REPUBLIC OF
| | - Volker F Wendisch
- Bielefeld University: Universitat Bielefeld, Genetics of Prokaryotes, Universitätsstr. 25, 33615, Bielefeld, GERMANY
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7
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Hu Y, Chen S, Yang F, Dong S. Marine Indole Alkaloids-Isolation, Structure and Bioactivities. Mar Drugs 2021; 19:658. [PMID: 34940657 PMCID: PMC8708922 DOI: 10.3390/md19120658] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 11/19/2021] [Accepted: 11/22/2021] [Indexed: 11/30/2022] Open
Abstract
Indole alkaloids are heterocyclic natural products with extensive pharmacological activities. As an important source of lead compounds, many clinical drugs have been derived from natural indole compounds. Marine indole alkaloids, from unique marine environments with high pressure, high salt and low temperature, exhibit structural diversity with various bioactivities, which attracts the attention of drug researchers. This article is a continuation of the previous two comprehensive reviews and covers the literature on marine indole alkaloids published from 2015 to 2021, with 472 new or structure-revised compounds categorized by sources into marine microorganisms, invertebrates, and plant-derived. The structures and bioactivities demonstrated in this article will benefit the synthesis and pharmacological activity study for marine indole alkaloids on their way to clinical drugs.
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Affiliation(s)
| | | | | | - Shuai Dong
- Key Laboratory of Tropical Biological Resources of Ministry of Education, School of Pharmaceutical Sciences, Hainan University, Haikou 570228, China; (Y.H.); (S.C.); (F.Y.)
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Muzychka L, Voronkina A, Kovalchuk V, Smolii OB, Wysokowski M, Petrenko I, Youssef DTA, Ehrlich I, Ehrlich H. Marine biomimetics: bromotyrosines loaded chitinous skeleton as source of antibacterial agents. APPLIED PHYSICS. A, MATERIALS SCIENCE & PROCESSING 2021; 127:15. [PMID: 33424135 PMCID: PMC7776313 DOI: 10.1007/s00339-020-04167-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 11/23/2020] [Indexed: 05/10/2023]
Abstract
UNLABELLED The marine sponges of the order Verongiida (Demospongiae: Porifera) have survived on our planet for more than 500 million years due to the presence of a unique strategy of chemical protection by biosynthesis of more than 300 derivatives of biologically active bromotyrosines as secondary metabolites. These compounds are synthesized within spherulocytes, highly specialized cells located within chitinous skeletal fibers of these sponges from where they can be extruded in the sea water and form protective space against pathogenic viruses, bacteria and other predators. This chitin is an example of unique biomaterial as source of substances with antibiotic properties. Traditionally, the attention of researchers was exclusively drawn to lipophilic bromotyrosines, the extraction methods of which were based on the use of organic solvents only. Alternatively, we have used in this work a biomimetic water-based approach, because in natural conditions, sponges actively extrude bromotyrosines that are miscible with the watery environment. This allowed us to isolate 3,5-dibromoquinolacetic acid from an aqueous extract of the dried demosponge Aplysina aerophoba and compare its antimicrobial activity with the same compound obtained by the chemical synthesis. Both synthetic and natural compounds have shown antimicrobial properties against clinical strains of Staphylococcus aureus, Enterococcus faecalis and Propionibacterium acnes. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s00339-020-04167-0.
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Affiliation(s)
- Liubov Muzychka
- V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry, National Academy of Science of Ukraine, Murmanska Str. 1, Kiev, 02094 Ukraine
| | - Alona Voronkina
- Department of Pharmacy, National Pirogov Memorial Medical University, Vinnytsya, Vinnytsia 21018 Ukraine
| | - Valentine Kovalchuk
- Department of Microbiology, National Pirogov Memorial Medical University, Vinnytsya, Vinnytsia 21018 Ukraine
| | - Oleg B. Smolii
- V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry, National Academy of Science of Ukraine, Murmanska Str. 1, Kiev, 02094 Ukraine
| | - Marcin Wysokowski
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, 60965 Poznan, Poland
- Institute of Electronic and Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner Str. 3, 09599 Freiberg, Germany
| | - Iaroslav Petrenko
- Institute of Electronic and Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner Str. 3, 09599 Freiberg, Germany
| | - Diaa T. A. Youssef
- Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah, 21589 Saudi Arabia
- Department of Pharmacognosy, Faculty of Pharmacy, Suez Canal University, Ismailia, 41522 Egypt
| | | | - Hermann Ehrlich
- Institute of Electronic and Sensor Materials, TU Bergakademie Freiberg, Gustav-Zeuner Str. 3, 09599 Freiberg, Germany
- Center for Advanced Technology, Adam Mickiewicz University, 61614 Poznan, Poland
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Carroll AR, Copp BR, Davis RA, Keyzers RA, Prinsep MR. Marine natural products. Nat Prod Rep 2021; 38:362-413. [PMID: 33570537 DOI: 10.1039/d0np00089b] [Citation(s) in RCA: 220] [Impact Index Per Article: 73.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This review covers the literature published in 2019 for marine natural products (MNPs), with 719 citations (701 for the period January to December 2019) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1490 in 440 papers for 2019), together with the relevant biological activities, source organisms and country of origin. Pertinent reviews, biosynthetic studies, first syntheses, and syntheses that led to the revision of structures or stereochemistries, have been included. Methods used to study marine fungi and their chemical diversity have also been discussed.
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Affiliation(s)
- Anthony R Carroll
- School of Environment and Science, Griffith University, Gold Coast, Australia. and Griffith Institute for Drug Discovery, Griffith University, Brisbane, Australia
| | - Brent R Copp
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Rohan A Davis
- Griffith Institute for Drug Discovery, Griffith University, Brisbane, Australia and School of Enivironment and Science, Griffith University, Brisbane, Australia
| | - Robert A Keyzers
- Centre for Biodiscovery, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Michèle R Prinsep
- Chemistry, School of Science, University of Waikato, Hamilton, New Zealand
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