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Tchangoue YAN, Tchamgoue J, Lunga PK, Knepper J, Paltinean R, Ibrom K, Crișan G, Kouam SF, Ali MS, Schulz S. Antibacterial phloroglucinols derivatives from the leaves of Mallotus oppositifolius (Geisler) Müll. Arg. (Euphorbiaceae). Fitoterapia 2020; 142:104527. [PMID: 32114036 DOI: 10.1016/j.fitote.2020.104527] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 02/05/2020] [Revised: 02/24/2020] [Accepted: 02/25/2020] [Indexed: 11/25/2022]
Abstract
From the ethno-medicinally used leaves of Mallotus oppositifolius, four acylphloroglucinol derivatives, namely Acronyculatin SU (1-3) and Mallotojaponin D (4) were isolated along with seven known compounds (5-11). Structures were elucidated by comprehensive spectroscopic analyses and HRMS data. Absolute configurations were assigned by careful comparison of their specific optical rotation with those of closely related compounds. Compounds 1, 2, 6 and 11 demonstrated inhibitory activity against the bacterial strains E. coli, S. aureus, S. typhi, P. aeruginosa with minimum inhibitory concentration (MIC) values ranging from 3.125 to 50 μg/ml.
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Affiliation(s)
- Yvan Anderson Ngandjui Tchangoue
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, P.O. Box 47, Yaounde, Cameroon; Institute of Organic Chemistry, TU Braunschweig, Hagenring 30, 38106 Braunschweig, Germany; Faculty of pharmacy, University of Medicine and Pharmacy Iuliu Hațieganu, P.O. Box400349, Cluj-Napoca, Romania; H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Joseph Tchamgoue
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, P.O. Box 47, Yaounde, Cameroon
| | - Paul Keilah Lunga
- Laboratory of Phytobiochemistry and Medicinal Plants Study, Faculty of Science, University of Yaounde 1, P.O. Box 812, Yaounde, Cameroon
| | - Janosch Knepper
- Institute of Organic Chemistry, TU Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Ramona Paltinean
- Faculty of pharmacy, University of Medicine and Pharmacy Iuliu Hațieganu, P.O. Box400349, Cluj-Napoca, Romania
| | - Kerstin Ibrom
- Institute of Organic Chemistry, TU Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Gianina Crișan
- Faculty of pharmacy, University of Medicine and Pharmacy Iuliu Hațieganu, P.O. Box400349, Cluj-Napoca, Romania
| | - Simeon Fogue Kouam
- Department of Chemistry, Higher Teacher Training College, University of Yaounde I, P.O. Box 47, Yaounde, Cameroon.
| | - Muhammad Shaiq Ali
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Stefan Schulz
- Institute of Organic Chemistry, TU Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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Knepper J, Lüddecke T, Preißler K, Vences M, Schulz S. Isolation and Identification of Alkaloids from Poisons of Fire Salamanders ( Salamandra salamandra). J Nat Prod 2019; 82:1319-1324. [PMID: 31074997 DOI: 10.1021/acs.jnatprod.9b00065] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Fire salamanders ( Salamandra salamandra) are conspicuously colored amphibians secreting a skin poison that contains unique steroid alkaloids such as samandarine (1) and samadarone (2), exhibiting toxic as well as antimicrobial activities. Because of their antipredatory and anti-infectious functions, alkaloids from Salamandra poison are of interest with regard to the threat that the lethal fungus Batrachochytrium salamandrivorans ( Bsal) poses to salamanders. Nevertheless, reliable data on the biological activity of Salamandra alkaloids are scarce, in part due to the difficulty to obtain and study those substances. Thus, isolation of pure salamander alkaloids is an important task that might directly contribute to the understanding of Bsal infections. Here we present a noninvasive isolation procedure for samandarine (1) and O-acetylsamandarine (3), as well as for two new alkaloids, O-3-hydroxybutanoylsamandarine (4) and samanone (6), using HPLC. For the first time, high-field NMR data are presented for these alkaloids. Analysis using GC/MS and ESI+-MS, provided important information on the structural variability of these salamander alkaloids.
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Affiliation(s)
- Janosch Knepper
- Institute of Organic Chemistry , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Tim Lüddecke
- Animal Venomics Research Group , Fraunhofer Institute for Molecular Biology and Applied Ecology , Winchesterstraße 2 , 35394 Gießen , Germany
- Zoological Institute , Technische Universität Braunschweig , Mendelssohnstraße 4 , 38106 Braunschweig , Germany
| | - Kathleen Preißler
- Zoological Institute , Technische Universität Braunschweig , Mendelssohnstraße 4 , 38106 Braunschweig , Germany
| | - Miguel Vences
- Zoological Institute , Technische Universität Braunschweig , Mendelssohnstraße 4 , 38106 Braunschweig , Germany
| | - Stefan Schulz
- Institute of Organic Chemistry , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
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Hocke AC, Becher A, Knepper J, Peter A, Holland G, Tönnies M, Bauer T, Schneider P, Neudecker J, Muth D, Wendtner C, Rückert J, Drosten C, Gruber A, Laue M, Wolff T, Suttorp N, Hippenstiel S. Infection of human lung tissue with influenza A and MERS-corona virus. Pneumologie 2014. [DOI: 10.1055/s-0033-1363123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Knepper J, Ramacciotti E, Wakefield TW. Novel anticoagulants: a discussion of clinical use in the treatment and prevention of venous thromboembolism. Phlebology 2011; 26:3-7. [PMID: 21239724 DOI: 10.1258/phleb.2010.010023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Traditional therapeutic oral anticoagulation strategies often require invasive dosing or monitoring. Vitamin K antagonists (VKAs) have a large number of interactions, delayed onset requires frequent dose monitoring, and they have a small margin between therapeutic dose and bleeding complications. Novel oral anticoagulants, such as dabigatran, rivaroxaban and apixaban, are being developed to prevent those VKAs drawbacks. Besides oral bioavailability, those compounds are designed to require minimal to no monitoring and have a favourable safety profile. This review reports efficacy and safety data of these compounds throughout clinical development, as well as new approaches for oral pharmacological management of venous thromboembolism.
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Affiliation(s)
- J Knepper
- Conrad Jobst Vascular Research Laboratories, Section of Vascular Surgery, University of Michigan Medical Center, A570D, MSRB II, 1150 W. Medical Center Dr, Ann Arbor, MI 48109, USA.
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