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Karan D, Dubey S, Gunewardena S, Iczkowski KA, Singh M, Liu P, Poletti A, Choo YM, Chen HZ, Hamann MT. Manzamine A reduces androgen receptor transcription and synthesis by blocking E2F8-DNA interactions and effectively inhibits prostate tumor growth in mice. Mol Oncol 2024. [PMID: 38605607 DOI: 10.1002/1878-0261.13637] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 02/14/2024] [Accepted: 03/12/2024] [Indexed: 04/13/2024] Open
Abstract
The androgen receptor (AR) is the main driver in the development of castration-resistant prostate cancer, where the emergence of AR splice variants leads to treatment-resistant disease. Through detailed molecular studies of the marine alkaloid manzamine A (MA), we identified transcription factor E2F8 as a previously unknown regulator of AR transcription that prevents AR synthesis in prostate cancer cells. MA significantly inhibited the growth of various prostate cancer cell lines and was highly effective in inhibiting xenograft tumor growth in mice without any pathophysiological perturbations in major organs. MA suppressed the full-length AR (AR-FL), its spliced variant AR-V7, and the AR-regulated prostate-specific antigen (PSA; also known as KLK3) and human kallikrein 2 (hK2; also known as KLK2) genes. RNA sequencing (RNA-seq) analysis and protein modeling studies revealed E2F8 interactions with DNA as a potential novel target of MA, suppressing AR transcription and its synthesis. This novel mechanism of blocking AR biogenesis via E2F8 may provide an opportunity to control therapy-resistant prostate cancer over the currently used AR antagonists designed to target different parts of the AR gene.
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Affiliation(s)
- Dev Karan
- Department of Pathology, and MCW Cancer Center, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Seema Dubey
- Department of Pathology, and MCW Cancer Center, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Sumedha Gunewardena
- Department of Cell Biology and Physiology, University of Kansas Medical Center, KS, USA
| | - Kenneth A Iczkowski
- Department of Pathology, and MCW Cancer Center, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Manohar Singh
- Department of Pathology, and MCW Cancer Center, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Pengyuan Liu
- Department of Physiology and Center of Systems Molecular Medicine, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Angelo Poletti
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Italy
| | - Yeun-Mun Choo
- Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | - Hui-Zi Chen
- Department of Medicine, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine, Hollings Cancer Center, Medical University of South Carolina, Charleston, SC, USA
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Place AR, Ramos-Franco J, Waters AL, Hamann MT. A Toxic Sterolysin From a 1950s Culture of Gymnodinium Veneficum Ballantine. Res Sq 2024:rs.3.rs-3970188. [PMID: 38585775 PMCID: PMC10996815 DOI: 10.21203/rs.3.rs-3970188/v1] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
In 1957 Abbott and Ballentine described a highly toxic activity from a dinoflagellate isolated from the English Channel. in 1949 by Mary Park. From a culture maintained at Plymouth Laboratory since 1950, we have been able to isolate two toxic molecules (Abbotoxin and 59-E-Chloro-Abbotoxin), determine the planar structures by analysis of HRMS and 1D and 2D NMR spectra and found them to be karlotoxin (KmTx) congeners. Both toxins kill larval zebrafish with symptoms identical to that described by Abbot and Ballantine for gobies (Gobius virescens). Using surface plasma resonance the sterol binding specificity of karlotoxins is shown to require desmethyl sterols. Our results with black lipid membranes indicate that karlotoxin forms large-conductance channels in the lipid membrane, which are characterized by large ionic conductance, poor ionic selectivity, and a complex gating behavior that exhibits strong voltage dependence and multiple gating patterns. In addition, we show that KmTx 2 pore formation is a highly targeted mechanism involving sterol-specificity. This is the first report of the functional properties of the membrane pores formed by karlotoxins and are consistent with the intial observations of Abbott and Ballentine from 1957.
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Affiliation(s)
- Allen R Place
- University of Maryland Center for Environmental Sciences
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3
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Maykovich T, Hardy S, Hamann MT, Cray J. Manzamine-A Alters In Vitro Calvarial Osteoclast Function. J Nat Prod 2024; 87:560-566. [PMID: 38383319 DOI: 10.1021/acs.jnatprod.3c01097] [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] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Manzamine-A is a marine-derived alkaloid that has demonstrated antimalarial and antiproliferative properties and is an emerging drug lead compound as a possible intervention in certain cancers. This compound has been found to modulate SIX1 gene expression, a target that is critical for the proliferation and survival of cells via various developmental pathways. As yet, little research has focused on manzamine-A and how its use may affect tissue systems including bone. Here we hypothesized that manzamine-A, through its interaction with SIX1, would alter precursor cells that give rise to the bone cell responsible for remodeling: the osteoclast. We further hypothesized reduced effects in differentiated osteoclasts, as these cells are generally not mitotic. We interrogated the effects of manzamine-A on preosteoclasts and osteoclasts. qrtPCR, MTS cell viability, Caspase 3/7, and TRAP staining were used as a functional assay. Preosteoclasts show responsiveness to manzamine-A treatment exhibited by decreases in cell viability and an increase in apoptosis. Osteoclasts also proved to be affected by manzamine-A but only at higher concentrations where apoptosis was increased and activation was reduced. In summary, our presented results suggest manzamine-A may have significant effects on bone development and health through multiple cell targets, previously shown in the osteoblast cell lineage, the cell responsible for mineralized tissue formation, and here in the osteoclast, the cell responsible for the removal of mineralized tissue and renewal via precipitation of bone remodeling.
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Affiliation(s)
- Tyler Maykovich
- Department of Biomedical Education and Anatomy, The Ohio State University College of Medicine, Columbus, Ohio 43210, United States
| | - Samantha Hardy
- Department of Biomedical Education and Anatomy, The Ohio State University College of Medicine, Columbus, Ohio 43210, United States
| | - Mark T Hamann
- Departments of Drug Discovery and Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston, South Carolina 29425-1410, United States
| | - James Cray
- Department of Biomedical Education and Anatomy, The Ohio State University College of Medicine, Columbus, Ohio 43210, United States
- Division of Biosciences, The Ohio State College of Dentistry, Columbus, Ohio 43210, United States
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Hanna G, Benjamin MM, Choo YM, De R, Schinazi RF, Nielson SE, Hevel JM, Hamann MT. Informatics and Computational Approaches for the Discovery and Optimization of Natural Product-Inspired Inhibitors of the SARS-CoV-2 2'- O-Methyltransferase. J Nat Prod 2024; 87:217-227. [PMID: 38242544 PMCID: PMC10898454 DOI: 10.1021/acs.jnatprod.3c00875] [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] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 11/17/2023] [Accepted: 11/21/2023] [Indexed: 01/21/2024]
Abstract
The urgent need for new classes of orally available, safe, and effective antivirals─covering a breadth of emerging viruses─is evidenced by the loss of life and economic challenges created by the HIV-1 and SARS-CoV-2 pandemics. As frontline interventions, small-molecule antivirals can be deployed prophylactically or postinfection to control the initial spread of outbreaks by reducing transmissibility and symptom severity. Natural products have an impressive track record of success as prototypic antivirals and continue to provide new drugs through synthesis, medicinal chemistry, and optimization decades after discovery. Here, we demonstrate an approach using computational analysis typically used for rational drug design to identify and develop natural product-inspired antivirals. This was done with the goal of identifying natural product prototypes to aid the effort of progressing toward safe, effective, and affordable broad-spectrum inhibitors of Betacoronavirus replication by targeting the highly conserved RNA 2'-O-methyltransferase (2'-O-MTase). Machaeriols RS-1 (7) and RS-2 (8) were identified using a previously outlined informatics approach to first screen for natural product prototypes, followed by in silico-guided synthesis. Both molecules are based on a rare natural product group. The machaeriols (3-6), isolated from the genus Machaerium, endemic to Amazonia, inhibited the SARS-CoV-2 2'-O-MTase more potently than the positive control, Sinefungin (2), and in silico modeling suggests distinct molecular interactions. This report highlights the potential of computationally driven screening to leverage natural product libraries and improve the efficiency of isolation or synthetic analog development.
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Affiliation(s)
- George
S. Hanna
- Department
of Drug Discovery, Biomedical Sciences and Public Health, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Menny M. Benjamin
- Department
of Drug Discovery, Biomedical Sciences and Public Health, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Yeun-Mun Choo
- Department
of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Ramyani De
- Center
for ViroScience and Cure, Laboratory of Biochemical Pharmacology,
Department of Pediatrics, Emory University
School of Medicine, 1760 Haygood Drive, NE Atlanta, Georgia 30322, United States
| | - Raymond F. Schinazi
- Center
for ViroScience and Cure, Laboratory of Biochemical Pharmacology,
Department of Pediatrics, Emory University
School of Medicine, 1760 Haygood Drive, NE Atlanta, Georgia 30322, United States
| | - Sarah E. Nielson
- Department
of Chemistry & Biochemistry, Utah State
University, Logan, Utah 84322, United States
| | - Joan M. Hevel
- Department
of Chemistry & Biochemistry, Utah State
University, Logan, Utah 84322, United States
| | - Mark T. Hamann
- Department
of Drug Discovery, Biomedical Sciences and Public Health, Medical University of South Carolina, Charleston, South Carolina 29425, United States
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Wu XY, Zhao ZY, Osman EEA, Wang XJ, Choo YM, Benjamin MM, Xiong J, Hamann MT, Luo C, Hu JF. Platanosides from Platanus × acerifolia: New molecules, SAR, and target validation of a strong lead for drug-resistant bacterial infections and the associated sepsis. Bioorg Chem 2024; 143:107103. [PMID: 38211549 DOI: 10.1016/j.bioorg.2024.107103] [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] [Received: 11/30/2023] [Revised: 12/29/2023] [Accepted: 01/03/2024] [Indexed: 01/13/2024]
Abstract
Three undescribed (1-3) and nine known (4-12) platanosides were isolated and characterized from a bioactive extract of the May leaves of Platanus × acerifolia that initially showed inhibition against Staphylococcus aureus. Targeted compound mining was guided by an LC-MS/MS-based molecular ion networking (MoIN) strategy combined with conventional isolation procedures from a unique geographic location. The novel structures were mainly determined by 2D NMR and computational (NMR/ECD calculations) methods. Compound 1 is a rare acylated kaempferol rhamnoside possessing a truxinate unit. 6 (Z,E-platanoside) and 7 (E,E-platanoside) were confirmed to have remarkable inhibitory effects against both methicillin-resistant S. aureus (MIC: ≤ 16 μg/mL) and glycopeptide-resistant Enterococcus faecium (MIC: ≤ 1 μg/mL). These platanosides were subjected to docking analyses against FabI (enoyl-ACP reductase) and PBP1/2 (penicillin binding protein), both of which are pivotal enzymes governing bacterial growth but not found in the human host. The results showed that 6 and 7 displayed superior binding affinities towards FabI and PBP2. Moreover, surface plasmon resonance studies on the interaction of 1/7 and FabI revealed that 7 has a higher affinity (KD = 1.72 μM), which further supports the above in vitro data and is thus expected to be a novel anti-antibacterial drug lead.
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Affiliation(s)
- Xi-Ying Wu
- Institute of Natural Medicine and Health Products, School of Pharmaceutical Sciences, Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Zhejiang 318000, PR China; School of Pharmacy, Fudan University, Shanghai 201203, PR China; Shanghai Skin Disease Hospital, Tongji University School of Medicine, Shanghai 200443, PR China
| | - Ze-Yu Zhao
- Institute of Natural Medicine and Health Products, School of Pharmaceutical Sciences, Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Zhejiang 318000, PR China; School of Pharmacy, Fudan University, Shanghai 201203, PR China
| | - Ezzat E A Osman
- Department of Medicinal Chemistry, Theodor Bilharz Research Institute, Kornaish El-Nile St., Giza 12411, Egypt
| | - Xiao-Juan Wang
- School of Pharmacy, Lanzhou University, Lanzhou 730000, Gansu, PR China; Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston 29425-5700, USA
| | - Yeun-Mun Choo
- Chemistry Department, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia.
| | - Menny M Benjamin
- Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston 29425-5700, USA
| | - Juan Xiong
- School of Pharmacy, Fudan University, Shanghai 201203, PR China
| | - Mark T Hamann
- Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston 29425-5700, USA.
| | - Cheng Luo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Science, Shanghai 201203, PR China
| | - Jin-Feng Hu
- Institute of Natural Medicine and Health Products, School of Pharmaceutical Sciences, Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Zhejiang 318000, PR China; School of Pharmacy, Fudan University, Shanghai 201203, PR China; Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston 29425-5700, USA.
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Cahyani NKD, Kasanah N, Kurnia DS, Hamann MT. Profiling Prokaryotic Communities and Aaptamines of Sponge Aaptos suberitoides from Tulamben, Bali. Mar Biotechnol (NY) 2023; 25:1158-1175. [PMID: 38008858 DOI: 10.1007/s10126-023-10268-7] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Accepted: 11/04/2023] [Indexed: 11/28/2023]
Abstract
Sponges (Porifera) harbor a diversity of microorganisms that contribute largely to the production a vast array of bioactive compounds. The microorganisms associated with sponge have an important impact on the chemical diversity of the natural products. Herein, our study focuses on an Aaptos suberitoides commonly found in Indonesia. The objective of this study was to investigate the profile of prokaryotic community and the presence of aaptamine metabolites in sponge Aaptos suberitoides. Sponges were collected from two site locations (Liberty Wreck and Drop Off) in Tulamben, Bali. The sponges were identified by barcoding DNA cytochrome oxidase subunit I (COI) gene. The profile of prokaryotic composition was investigated by amplifying the 16S rRNA gene using primers 515f and 806r to target the V4 region. The metabolites were analyzed using LC-MS, and dereplication was done to identify the aaptamines and its derivates. The barcoding DNA of the sponges confirmed the identity of samples as Aaptos suberitoides. The prokaryotic communities of samples A. suberitoides were enriched and dominated by taxa Proteobacteria, Chloroflexi, Actinobacteria, and Acidobacteria. The chemical analysis showed that all sponges produce aaptamine and isoaaptamine except A. suberitoides S2421 produce analog of aaptamines. This is the first report on the profile of prokaryotic community and the aaptamine of tropical marine sponges, A. suberitoides, from Tulamben, Bali.
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Affiliation(s)
- Ni Kadek Dita Cahyani
- Biology Department, Faculty of Science and Mathematics, Diponegoro University, Semarang, Central Java, Indonesia
| | - Noer Kasanah
- Department of Fisheries, Faculty of Agriculture, Universitas Gadjah Mada, Yogyakarta, Indonesia.
| | - Dewi Sri Kurnia
- Department of Biotechnology, Graduate School, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC, USA
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Liu Y, Gao P, Liang X, Zhang Y, Yu X, Xue X, Kockaya L, Pandey P, Doerksen RJ, Wang X, Yao G, Chu W, Chen X, Song S, Hamann MT, Li L. Prenylated flavonoids with significant anti-hepatoma activity from Daphne giraldii and effects on Fibroblast Growth Factor Receptor 1 (FGFR1). Eur J Med Chem 2023; 247:115006. [PMID: 36549116 DOI: 10.1016/j.ejmech.2022.115006] [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: 09/29/2022] [Revised: 11/23/2022] [Accepted: 12/03/2022] [Indexed: 12/14/2022]
Abstract
We report here the orchestration of molecular ion networking (MoIN) and a set of computational and informatics assisted structural elucidation approaches in the discovery of 23 new prenyl-flavonoids and 13 known molecules from Daphne giraldii Nitsche (Thymelaeaceae), some of which possess significant bioactivity against hepatoma carcinoma. Daphnegiratriprenylone A (DPTP-A) represents the class of polyprenyl-flavonoids possessing a triprenyl substitution, and was identified with the guidance of mass spectrometry and nuclear magnetic resonance combined with computational approaches. This approach illustrates a paradigm shift in the application of computational tools for the direct assignment of new natural product structures and it was demonstrated to be reliable compared to conventional 2D-NMR techniques. Seventeen compounds exhibited potent and selective activity against Hep3B cells (IC50 ranging from 0.42 to 7.08 μM). Tyrosine kinase FGFR1 has emerged as a potential target of polyprenyl-flavonoids by a reverse pharmacophore mapping approach. We validated that the prenyl-flavonoids effectively inhibit FGFR1 using the Mobility Shift Assay, Western blot and molecular dynamics simulations, and the results suggest significant potency of the compounds towards FGFR1. These findings provide a new chemical class with strong links to traditional medicines, possessing reasonable safety for developing potential therapeutic agents for FGFR1-related diseases.
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Affiliation(s)
- Ying Liu
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Pinyi Gao
- College of Pharmaceutical and Biotechnology Engineering, Shenyang University of Chemical Technology, Shenyang, 110142, PR China
| | - Xiao Liang
- College of Pharmacy, Liaoning University, 66 Chongshan Road, Shenyang, 110036, Liaoning, PR China
| | - Yangyang Zhang
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Xiaoqi Yu
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Xiaobian Xue
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Lara Kockaya
- Division of Medicinal Chemistry, Department of BioMolecular Sciences, University of Mississippi, Mississippi, 38677, USA
| | - Pankaj Pandey
- National Center for Natural Products Research, School of Pharmacy, University of Mississippi, Mississippi, 38677, USA
| | - Robert J Doerksen
- Division of Medicinal Chemistry, Department of BioMolecular Sciences, University of Mississippi, Mississippi, 38677, USA
| | - Xiaojuan Wang
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, Gansu, PR China
| | - Guodong Yao
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Wanchun Chu
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Xin Chen
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Shaojiang Song
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China
| | - Mark T Hamann
- College of Pharmacy & Medicine, Medical University of South Carolina, Charleston, SC, 29425-5700, USA.
| | - Lingzhi Li
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, PR China.
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Boswell Z, Verga JU, Mackle J, Guerrero-Vazquez K, Thomas OP, Cray J, Wolf BJ, Choo YM, Croot P, Hamann MT, Hardiman G. In-Silico Approaches for the Screening and Discovery of Broad-Spectrum Marine Natural Product Antiviral Agents Against Coronaviruses. Infect Drug Resist 2023; 16:2321-2338. [PMID: 37155475 PMCID: PMC10122865 DOI: 10.2147/idr.s395203] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Accepted: 03/16/2023] [Indexed: 05/10/2023] Open
Abstract
The urgent need for SARS-CoV-2 controls has led to a reassessment of approaches to identify and develop natural product inhibitors of zoonotic, highly virulent, and rapidly emerging viruses. There are yet no clinically approved broad-spectrum antivirals available for beta-coronaviruses. Discovery pipelines for pan-virus medications against a broad range of betacoronaviruses are therefore a priority. A variety of marine natural product (MNP) small molecules have shown inhibitory activity against viral species. Access to large data caches of small molecule structural information is vital to finding new pharmaceuticals. Increasingly, molecular docking simulations are being used to narrow the space of possibilities and generate drug leads. Combining in-silico methods, augmented by metaheuristic optimization and machine learning (ML) allows the generation of hits from within a virtual MNP library to narrow screens for novel targets against coronaviruses. In this review article, we explore current insights and techniques that can be leveraged to generate broad-spectrum antivirals against betacoronaviruses using in-silico optimization and ML. ML approaches are capable of simultaneously evaluating different features for predicting inhibitory activity. Many also provide a semi-quantitative measure of feature relevance and can guide in selecting a subset of features relevant for inhibition of SARS-CoV-2.
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Affiliation(s)
- Zachary Boswell
- School of Biological Sciences and Institute for Global Security, Queen's University, Belfast, Northern Ireland, UK
| | - Jacopo Umberto Verga
- School of Biological Sciences and Institute for Global Security, Queen's University, Belfast, Northern Ireland, UK
- Genomic Data Science, University of Galway, Galway, Ireland
| | - James Mackle
- School of Biological Sciences and Institute for Global Security, Queen's University, Belfast, Northern Ireland, UK
| | | | - Olivier P Thomas
- School of Biological and Chemical Sciences, Ryan Institute, University of Galway, Galway, H91TK33Ireland
| | - James Cray
- Department of Biomedical Education and Anatomy, College of Medicine and Division of Biosciences, College of Dentistry, Ohio State University, Columbus, OH, USA
| | - Bethany J Wolf
- Department of Public Health Sciences, Medical University of South Carolina, Charleston, SC, USA
| | - Yeun-Mun Choo
- Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | - Peter Croot
- Irish Centre for Research in Applied Geoscience, Earth and Ocean Sciences and Ryan Institute, School of Natural Sciences, University of Galway, Galway, Ireland
| | - Mark T Hamann
- Departments of Drug Discovery and Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston, SC, USA
| | - Gary Hardiman
- School of Biological Sciences and Institute for Global Security, Queen's University, Belfast, Northern Ireland, UK
- Department of Public Health Sciences, Medical University of South Carolina, Charleston, SC, USA
- Department of Medicine, Medical University of South Carolina, Charleston, SC, USA
- Correspondence: Gary Hardiman, School of Biological Sciences and Institute for Global Food Security, Faculty of Medicine, Health, and Life Sciences, Queen’s University Belfast, 19 Chlorine Gardens, Belfast, BT9 5DL, Northern Ireland, UK, Email
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Baker BJ, Hamann MT, Nakao Y. Commemorative Issue in Honor of Professor Paul J. Scheuer. Mar Drugs 2022; 20:md20110678. [PMID: 36355002 PMCID: PMC9697032 DOI: 10.3390/md20110678] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 10/21/2022] [Indexed: 11/29/2022] Open
Abstract
This Special Issue is dedicated to the memory of Professor Paul J [...].
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Affiliation(s)
- Bill J. Baker
- Department of Chemistry, University of South Florida, 4202 E. Fowler Avenue, CHE 205, Tampa, FL 33620, USA
- Correspondence:
| | - Mark T. Hamann
- Departments of Drug Discovery and Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Yoichi Nakao
- Department of Chemistry and Biochemistry, Graduate School of Advanced Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan
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Samuvel DJ, Nguyen NT, Jaeschke H, Lemasters JJ, Wang X, Choo YM, Hamann MT, Zhong Z. Platanosides, a Potential Botanical Drug Combination, Decrease Liver Injury Caused by Acetaminophen Overdose in Mice. J Nat Prod 2022; 85:1779-1788. [PMID: 35815804 PMCID: PMC9788857 DOI: 10.1021/acs.jnatprod.2c00324] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Oxidative stress plays an important role in acetaminophen (APAP)-induced hepatotoxicity. Platanosides (PTSs) isolated from the American sycamore tree (Platanus occidentalis) represent a potential new four-molecule botanical drug class of antibiotics active against drug-resistant infectious disease. Preliminary studies have suggested that PTSs are safe and well tolerated and have antioxidant properties. The potential utility of PTSs in decreasing APAP hepatotoxicity in mice in addition to an assessment of their potential with APAP for the control of infectious diseases along with pain and pyrexia associated with a bacterial infection was investigated. On PTS treatment in mice, serum alanine aminotransferase (ALT) release, hepatic centrilobular necrosis, and 4-hydroxynonenal (4-HNE) were markedly decreased. In addition, inducible nitric oxide synthase (iNOS) expression and c-Jun-N-terminal kinase (JNK) activation decreased when mice overdosed with APAP were treated with PTSs. Computational studies suggested that PTSs may act as JNK-1/2 and Keap1-Nrf2 inhibitors and that the isomeric mixture could provide greater efficacy than the individual molecules. Overall, PTSs represent promising botanical drugs for hepatoprotection and drug-resistant bacterial infections and are effective in protecting against APAP-related hepatotoxicity, which decreases liver necrosis and inflammation, iNOS expression, and oxidative and nitrative stresses, possibly by preventing persistent JNK activation.
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Affiliation(s)
- Devadoss J. Samuvel
- Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC, United States
| | - Nga T. Nguyen
- Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - Hartmut Jaeschke
- Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States
| | - John J. Lemasters
- Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC, United States
- Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC, United States
| | - Xiaojuan Wang
- School of Pharmacy, Lanzhou University, Lanzhou, Gansu, People Republic of China
| | - Yeun-Mun Choo
- Chemistry Department, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Mark T. Hamann
- Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC, United States
| | - Zhi Zhong
- Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC, United States
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11
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Schumacher RW, Waters AL, Peng J, Schumacher RA, Bateman A, Thiele J, Mitchell AJ, Miller SG, Goldberg A, Tripathi SK, Agarwal AK, Zou Y, Choo YM, Hamann MT. Structure and Antimicrobial Activity of Rare Lactone Lipids from the Sooty Mold ( Scorias spongiosa). J Nat Prod 2022; 85:1436-1441. [PMID: 35473311 PMCID: PMC10243206 DOI: 10.1021/acs.jnatprod.1c01012] [Citation(s) in RCA: 2] [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: 06/08/2023]
Abstract
Two new lactone lipids, scoriosin (1) and its methyl ester (2), with a rare furylidene ring joined to a tetrahydrofurandione ring, were isolated from Scorias spongiosa, commonly referred to as sooty mold. The planar structure of these compounds was assigned by 1D and 2D NMR. The conformational analysis of these molecules was undertaken to evaluate the relative and absolute configuration through GIAO NMR chemical shift analysis and ECD calculation. In addition to the potent antimicrobial activities, compound 2 strongly potentiated the activity of amphotericin B against Cryptococcus neoformans, suggesting the potential utility of this compound in combination therapies for treating cryptococcal infections.
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Affiliation(s)
- Robert W Schumacher
- Department of Science, Pierson High School, Sag Harbor, New York 11963, United States
| | | | - Jiangnan Peng
- Department of Chemistry, Morgan State University, Baltimore, Maryland 21251, United States
| | - Richard A Schumacher
- Department of Science, Pierson High School, Sag Harbor, New York 11963, United States
| | - Ailish Bateman
- Department of Science, Pierson High School, Sag Harbor, New York 11963, United States
| | - Josie Thiele
- Department of Science, Pierson High School, Sag Harbor, New York 11963, United States
| | - Andrew J Mitchell
- Department of Science, Pierson High School, Sag Harbor, New York 11963, United States
| | - Samuel G Miller
- Department of Science, Pierson High School, Sag Harbor, New York 11963, United States
| | - Arthur Goldberg
- Department of Science, Pierson High School, Sag Harbor, New York 11963, United States
| | | | | | | | | | - Mark T Hamann
- Department of Chemistry, Morgan State University, Baltimore, Maryland 21251, United States
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, South Carolina 29425, United States
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12
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Krisanits BA, Woods P, Nogueira LM, Woolfork DD, Lloyd CE, Baldwin A, Frye CC, Peterson KD, Cosh SD, Guo QJ, Spruill LS, Lilly MB, Helke K, Li H, Hanna GS, Hamann MT, Thomas C, Ahmed M, Gooz MB, Findlay VJ, Turner DP. Non-enzymatic glycoxidation linked with nutrition enhances the tumorigenic capacity of prostate cancer epithelia through AGE mediated activation of RAGE in cancer associated fibroblasts. Transl Oncol 2022; 17:101350. [PMID: 35091340 PMCID: PMC8802052 DOI: 10.1016/j.tranon.2022.101350] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Accepted: 01/18/2022] [Indexed: 12/18/2022] Open
Abstract
The molecular implications of food consumption on cancer etiology are poorly defined. The rate of nutrition associated non-enzymatic glycoxidation, a reaction that occurs between reactive carbonyl groups on linear sugars and nucleophilic amino, lysyl and arginyl groups on fats and proteins, is rapidly increased by food cooking and manufacturing processes. In this study, we assign nutrition-associated glycoxidation with significant oncogenic potential, promoting prostate tumor growth, progression, and metastasis in vivo. Advanced glycation end products (AGEs) are the final irreversible product of non-enzymatic glycoxidation. Exogenous treatment of prostate tumor cells with a single AGE peptide replicated glycoxidation induced tumor growth in vivo. Mechanistically, receptor for AGE (RAGE) deficiency in the stroma inhibited AGE mediated tumor growth. Functionally, AGE treatment induced RAGE dimerization in activated fibroblasts which sustained and increased the migratory potential of tumor epithelial cells. These data identify a novel nutrition associated pathway that can promote a tissue microenvironment conducive for aggressive tumor growth. Targeted and/or interventional strategies aimed at reducing AGE bioavailability as a consequence of nutrition may be viewed as novel chemoprevention initiatives.
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Affiliation(s)
- Bradley A Krisanits
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States
| | - Pamela Woods
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States
| | - Lourdes M Nogueira
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States
| | - Demarcus D Woolfork
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States
| | - Courtney E Lloyd
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States
| | - Andrew Baldwin
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States
| | - Callan C Frye
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States
| | - Kendell D Peterson
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States
| | - Sean D Cosh
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States
| | - Qi-Jin Guo
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States
| | - Laura S Spruill
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States; Hollings Cancer Center, MUSC, United States
| | - Michael B Lilly
- Hollings Cancer Center, MUSC, United States; Department of Hematology/Oncology, MUSC, United States
| | - Kristi Helke
- Department of Comparative Medicine, MUSC, United States
| | - Hong Li
- Hollings Cancer Center, MUSC, United States; Department of Public Health Sciences, MUSC, United States
| | - George S Hanna
- Department of Drug Discovery and Biomedical Sciences, MUSC, United States
| | - Mark T Hamann
- Department of Public Health Sciences, MUSC, United States; Department of Drug Discovery and Biomedical Sciences, MUSC, United States
| | - Courtney Thomas
- Department of Biological & Physical Sciences, South Carolina State University, United States
| | - Mahtabuddin Ahmed
- Department of Biological & Physical Sciences, South Carolina State University, United States
| | - Monika B Gooz
- Department of Drug Discovery and Biomedical Sciences, MUSC, United States
| | - Victoria J Findlay
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States; Hollings Cancer Center, MUSC, United States
| | - David P Turner
- Department of Pathology & Laboratory Medicine, Medical University of South Carolina (MUSC), BEB407, Charleston, SC 29425, United States; Hollings Cancer Center, MUSC, United States.
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13
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Mayasari D, Murti YB, Pratiwi SUT, Sudarsono S, Hanna G, Hamann MT. TLC-Based Fingerprinting Analysis of the Geographical Variation of Melastoma malabathricum in Inland and Archipelago Regions: A Rapid and Easy-to-Use Tool for Field Metabolomics Studies. J Nat Prod 2022; 85:292-300. [PMID: 34965131 PMCID: PMC9359466 DOI: 10.1021/acs.jnatprod.1c00622] [Citation(s) in RCA: 2] [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: 06/14/2023]
Abstract
Melastoma malabathricum is an Indo-Pacific herb that has been used traditionally to treat numerous ailments such as wounds, dysentery, diarrhea, toothache, and diabetes. The objective of this study was to evaluate the variability of the metabolic profiles of M. malabathricum across its geographic distribution. By employing thin layer chromatography (TLC), specimens collected from six terrestrial and archipelago regions of Indonesia were analyzed by densitometry for metabolomic fingerprinting analysis combined with chemometric tools: principal component analysis (PCA) and hierarchical cluster analysis (HCA). Two PCAs were identified as PC1 and PC2 with 41.90% and 20.36%, respectively. Our results indicate the importance of considering geographic distribution during field-collection efforts since they demonstrate regional metabolic variation in secondary metabolites of M. malabathricum, as illustrated by TLC and their biological activities.
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Affiliation(s)
- Dian Mayasari
- Department of Pharmaceutical Biology, Faculty of Pharmacy, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
| | - Yosi Bayu Murti
- Department of Pharmaceutical Biology, Faculty of Pharmacy, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
| | | | - Sudarsono Sudarsono
- Department of Pharmaceutical Biology, Faculty of Pharmacy, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
| | - George Hanna
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, South Carolina 29425, United States
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14
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Hanna GS, Choo YM, Harbit R, Paeth H, Wilde S, Mackle J, Verga JU, Wolf BJ, Thomas OP, Croot P, Cray J, Thomas C, Li LZ, Hardiman G, Hu JF, Wang X, Patel D, Schinazi RF, O’Keefe BR, Hamann MT. Contemporary Approaches to the Discovery and Development of Broad-Spectrum Natural Product Prototypes for the Control of Coronaviruses. J Nat Prod 2021; 84:3001-3007. [PMID: 34677966 PMCID: PMC8547502 DOI: 10.1021/acs.jnatprod.1c00625] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Indexed: 05/25/2023]
Abstract
The pressing need for SARS-CoV-2 controls has led to a reassessment of strategies to identify and develop natural product inhibitors of zoonotic, highly virulent, and rapidly emerging viruses. This review article addresses how contemporary approaches involving computational chemistry, natural product (NP) and protein databases, and mass spectrometry (MS) derived target-ligand interaction analysis can be utilized to expedite the interrogation of NP structures while minimizing the time and expense of extraction, purification, and screening in BioSafety Laboratories (BSL)3 laboratories. The unparalleled structural diversity and complexity of NPs is an extraordinary resource for the discovery and development of broad-spectrum inhibitors of viral genera, including Betacoronavirus, which contains MERS, SARS, SARS-CoV-2, and the common cold. There are two key technological advances that have created unique opportunities for the identification of NP prototypes with greater efficiency: (1) the application of structural databases for NPs and target proteins and (2) the application of modern MS techniques to assess protein-ligand interactions directly from NP extracts. These approaches, developed over years, now allow for the identification and isolation of unique antiviral ligands without the immediate need for BSL3 facilities. Overall, the goal is to improve the success rate of NP-based screening by focusing resources on source materials with a higher likelihood of success, while simultaneously providing opportunities for the discovery of novel ligands to selectively target proteins involved in viral infection.
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Affiliation(s)
- George S. Hanna
- Departments of Drug Discovery and Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Yeun-Mun Choo
- Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | - Ryan Harbit
- College of Charleston, Charleston, South Carolina 29425, United States
| | - Heather Paeth
- Departments of Drug Discovery and Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Sarah Wilde
- Department of Biology, Clemson University, Clemson, South Carolina 29631, United States
| | - James Mackle
- School of Biological Sciences & Institute for Global Food Security, Queens University, Belfast, Northern Ireland, United Kingdom
| | - Jacopo-Umberto Verga
- School of Biological Sciences & Institute for Global Food Security, Queens University, Belfast, Northern Ireland, United Kingdom
| | - Bethany J. Wolf
- Department of Public Health Sciences, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Olivier P. Thomas
- Marine Biodiscovery, School of Chemistry and Ryan Institute, National University of Ireland Galway, Galway H91Tk33, Ireland
| | - Peter Croot
- Irish Centre for Research in Applied Geoscience, Earth and Ocean Sciences and Ryan Institute, School of Natural Sciences, National University of Ireland, Galway, Galway, Ireland
| | - James Cray
- Department of Biomedical Education and Anatomy, College of Medicine and Division of Biosciences, College of Dentistry, Ohio State University, Columbus, Ohio 43210, United States
| | - Courtney Thomas
- Department of Chemistry, South Carolina State University, Orangeburg, South Carolina, United States
| | - Ling-Zhi Li
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University/SPU, Shenyang, China
| | - Gary Hardiman
- School of Biological Sciences & Institute for Global Food Security, Queens University, Belfast, Northern Ireland, United Kingdom
| | - Jin-Feng Hu
- School of Advanced Study, Zhejiang Provincial Key Laboratory of Plant Ecology and Conservation, Taizhou University, Zhejiang 318000, China
| | - Xiaojuan Wang
- School of Pharmacy, Lanzhou University, Lanzhou, China
| | - Dharmeshkhumar Patel
- Department of Pediatrics, Laboratory of Biochemical Pharmacology, Emory University School of Medicine, and Children’s Healthcare of Atlanta, Atlanta, GA 30322, USA
| | - Raymond F. Schinazi
- Department of Pediatrics, Laboratory of Biochemical Pharmacology, Emory University School of Medicine, and Children’s Healthcare of Atlanta, Atlanta, GA 30322, USA
| | - Barry R. O’Keefe
- Molecular Targets Program, Center for Cancer Research, Natural Products Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Frederick, Maryland 21702, United States
| | - Mark T. Hamann
- Departments of Drug Discovery and Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston, South Carolina 29425, United States
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15
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Xiong J, Zhou PJ, Jiang HW, Huang T, He YH, Zhao ZY, Zang Y, Choo YM, Wang X, Chittiboyina AG, Pandey P, Hamann MT, Li J, Hu JF. Forrestiacids A and B, Pentaterpene Inhibitors of ACL and Lipogenesis: Extending the Limits of Computational NMR Methods in the Structure Assignment of Complex Natural Products. Angew Chem Int Ed Engl 2021; 60:22270-22275. [PMID: 34374477 DOI: 10.1002/anie.202109082] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [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: 07/08/2021] [Indexed: 12/30/2022]
Abstract
Forrestiacids A (1) and B (2) are a novel class of [4+2] type pentaterpenoids derived from a rearranged lanostane moiety (dienophile) and an abietane unit (diene). These unprecedented molecules were isolated using guidance by molecular ion networking (MoIN) from Pseudotsuga forrestii, an endangered member of the Asian Douglas Fir Family. The intermolecular hetero-Diels-Alder adducts feature an unusual bicyclo[2.2.2]octene ring system. Their structures were elucidated by spectroscopic analysis, GIAO NMR calculations and DP4+ probability analyses, electronic circular dichroism calculations, and X-ray diffraction analysis. This unique addition to the pentaterpene family represents the largest and the most complex molecule successfully assigned using computational approaches to predict accurately chemical shift values. Compounds 1 and 2 exhibited potent inhibitory activities (IC50 s <5 μM) of ATP-citrate lyase (ACL), a new drug target for the treatment of glycolipid metabolic disorders including hyperlipidemia. Validating this activity 1 effectively attenuated the de novo lipogenesis in HepG2 cells. These findings provide a new chemical class for developing potential therapeutic agents for ACL-related diseases with strong links to traditional medicines.
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Affiliation(s)
- Juan Xiong
- School of Pharmacy, Fudan University, Shanghai, 201203, P. R. China
| | - Peng-Jun Zhou
- School of Pharmacy, Fudan University, Shanghai, 201203, P. R. China
| | - Hao-Wen Jiang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, P. R. China
| | - Ting Huang
- School of Pharmacy, Fudan University, Shanghai, 201203, P. R. China
| | - Yu-Hang He
- School of Pharmacy, Fudan University, Shanghai, 201203, P. R. China
| | - Ze-Yu Zhao
- School of Pharmacy, Fudan University, Shanghai, 201203, P. R. China
| | - Yi Zang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, P. R. China
| | - Yeun-Mun Choo
- Chemistry Department, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia
| | - Xiaojuan Wang
- School of Pharmacy, Lanzhou University, Lanzhou, 730000, Gansu, P. R. China
| | - Amar G Chittiboyina
- National Center for Natural Products Research, University of Mississippi, Oxford, MS, 38677, USA
| | - Pankaj Pandey
- National Center for Natural Products Research, University of Mississippi, Oxford, MS, 38677, USA
| | - Mark T Hamann
- Colleges of Pharmacy and Medicine, Medical University of South Carolina, Charleston, SC, 29425-5700, USA
| | - Jia Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, P. R. China
| | - Jin-Feng Hu
- School of Pharmacy, Fudan University, Shanghai, 201203, P. R. China.,School of Advanced Study, Taizhou University, Taizhou, 318000, Zhejiang, P. R. China
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16
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Han SW, Wang XJ, Cui BS, Sun H, Chen H, Ferreira D, Li S, Hamann MT. Hepatoprotective Glucosyloxybenzyl 2-Hydroxy-2-isobutylsuccinates from Pleione yunnanensis. J Nat Prod 2021; 84:738-749. [PMID: 33606538 DOI: 10.1021/acs.jnatprod.0c01117] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Nine new glucosyloxybenzyl 2-hydroxy-2-isobutylsuccinates, pleionosides M-U (1-9), and 12 known compounds (10-21) were isolated from the pseudobulbs of Pleione yunnanensis. Their structures and absolute configurations were established through a combination of HRESIMS and NMR data and supported by physical and chemical methods. Compounds 5, 6, 10, and 15 showed significant in vitro hepatoprotective activity against d-galactosamine (d-GalN)-induced toxicity in HL-7702 cells with increasing cell viability by 27%, 22%, 19%, and 31% compared to the model group (cf. bicyclol, 14%) at 10 μM, respectively. Compounds 4, 9, and 11 exhibited moderate hepatoprotective activity against N-acetyl-p-aminophenol (APAP)-induced toxicity in HepG2 cells with increasing cell viability by 9%, 16%, and 12% compared to the model group (cf. bicyclol, 9%) at 10 μM, respectively.
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Affiliation(s)
- Shao-Wei Han
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Xiao-Juan Wang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, South Carolina 29425, United States
| | - Bao-Song Cui
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Hua Sun
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Hui Chen
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Daneel Ferreira
- Department of BioMolecular Sciences, Division of Pharmacognosy, Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, Mississippi 38677-1848, United States
| | - Shuai Li
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, South Carolina 29425, United States
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17
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Krisanits B, Fry C, Nogueira LM, Schuster R, El Ford M, Hamann MT, Lilly MB, Ahmed M, Findlay VJ, Turner DP. Abstract C083: Consumption of lifestyle-associated advanced glycation end products promotes prostate tumor growth by creating a tumor-enhancing stromal microenvironment. Cancer Epidemiol Biomarkers Prev 2020. [DOI: 10.1158/1538-7755.disp19-c083] [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] [Indexed: 11/16/2022] Open
Abstract
Abstract
Our research has demonstrated that advanced glycation end products (AGEs) derived from the diet can directly impact neoplastic growth by creating a tumor-enhancing micro-environment. Most people are unaware of what AGEs are or the damage they can cause, but we are exposed to them every day through the lives we lead and the foods that we eat. The Western diet together with more sedentary habits means that lifestyle-associated AGEs are accumulating in our bodies at a faster rate than ever before. Changes in the AGE equilibrium due to lifestyle cause protein dysfunction, reduced genetic fidelity, and aberrant cell signaling activation which we believe contribute to cancer disparity outcomes. Disparity populations defined by AGE-associated risk factors such as diet, smoking, drinking and physical inactivity often bear a greater cancer burden when compared to the general population (reviewed by the PI, Cancer Research 2015). Lifestyle associated AGEs therefore may represent a unifying biological consequence of the social, demographic and environmental risk factors that contribute to the increased cancer incidence and mortality associated with cancer disparity. An important discovery from our work is that consumption of a diet high in AGEs accelerates prostate tumor growth in syngeneic xenograft prostate cancer (PCa) models as well as disease progression in spontaneous PCa models. Critically, dietary-AGE mediated effects on prostate tumor growth were dependent upon the stromal activation of RAGE. An activated stroma is a critical pathway impacting prostate cancer outcomes in African American men. Our studies show that dietary-AGE alters cytokine profiles, increases the activation of cancer associated fibroblasts (CAFs) and increases immune cell recruitment to the tumor microenvironment. Tumor associated immune cells adopt distinct metabolic patterns which function to maintain the energy requirements needed for cell differentiation and functionality. Pathway analysis of expression data from excised tumors shows that AGE consumption significantly impacts energy metabolism through the aberrant expression of MYC regulated transcriptional targets. Our studies also show that AGEs are highest in African American men with prostate cancer. Dietary-AGE mediated activation of tumor stroma therefore may align with the ancestry specific stromal and immune profiles observed in African American men with prostate cancer. Due to their links with lifestyle, both pharmacological and/or interventional strategies aimed at reducing the AGE accumulation pool may be viewed as universal cancer preventive and/or therapeutic initiatives. This may be an attractive option for populations where lifestyle change is not feasible due to poverty, inability, illness, treatment side effects, time, apathy and depression.
Citation Format: Bradley Krisanits, Callen Fry, Lourdes M Nogueira, Reid Schuster, Marvella El Ford, Mark T Hamann, Michaell B Lilly, Mahtabuddin Ahmed, Victoria J Findlay, David P Turner. Consumption of lifestyle-associated advanced glycation end products promotes prostate tumor growth by creating a tumor-enhancing stromal microenvironment [abstract]. In: Proceedings of the Twelfth AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2019 Sep 20-23; San Francisco, CA. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2020;29(6 Suppl_2):Abstract nr C083.
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18
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Kochanowska-Karamyan AJ, Araujo HC, Zhang X, El-Alfy A, Carvalho P, Avery MA, Holmbo SD, Magolan J, Hamann MT. Isolation and Synthesis of Veranamine, an Antidepressant Lead from the Marine Sponge Verongula rigida. J Nat Prod 2020; 83:1092-1098. [PMID: 32227883 DOI: 10.1021/acs.jnatprod.9b01107] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The natural product veranamine was isolated from the marine sponge Verongula rigida. It contains a unique heterocyclic scaffold and demonstrates in vivo antidepressant activity and selective affinity for 5HT2B and sigma-1 receptors. The first total synthesis of veranamine is reported. Our scalable synthesis offers veranamine in six steps and 25% yield via an unprecedented vinylogous Pictet-Gams pyridine formation strategy. Veranamine is a promising new lead compound for antidepressant drug development.
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Affiliation(s)
- Anna J Kochanowska-Karamyan
- Departments of Pharmacognosy and Pharmacology, National Center for Natural Products Research, University of Mississippi, University Park, Mississippi 38677, United States
- Department of Pharmaceutical Sciences, School of Pharmacy, Texas Tech University HSC, Amarillo, Texas 79106, United States
| | - Hugo C Araujo
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844, United States
| | - Xiong Zhang
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8N 3Z5, Canada
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844, United States
| | - Abir El-Alfy
- Departments of Pharmacognosy and Pharmacology, National Center for Natural Products Research, University of Mississippi, University Park, Mississippi 38677, United States
- Department of Biopharmaceutical Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, United States
| | - Paulo Carvalho
- Departments of Pharmacognosy and Pharmacology, National Center for Natural Products Research, University of Mississippi, University Park, Mississippi 38677, United States
- Feik School of Pharmacy, University of the Incarnate Word, San Antonio, Texas 78209, United States
| | - Mitchell A Avery
- Departments of Pharmacognosy and Pharmacology, National Center for Natural Products Research, University of Mississippi, University Park, Mississippi 38677, United States
| | - Stephen D Holmbo
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844, United States
| | - Jakob Magolan
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON L8N 3Z5, Canada
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844, United States
| | - Mark T Hamann
- Departments of Pharmacognosy and Pharmacology, National Center for Natural Products Research, University of Mississippi, University Park, Mississippi 38677, United States
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, South Carolina 29425, United States
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19
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Karan D, Dubey S, Pirisi L, Nagel A, Pina I, Choo YM, Hamann MT. The Marine Natural Product Manzamine A Inhibits Cervical Cancer by Targeting the SIX1 Protein. J Nat Prod 2020; 83:286-295. [PMID: 32022559 PMCID: PMC7161578 DOI: 10.1021/acs.jnatprod.9b00577] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Indexed: 06/10/2023]
Abstract
Natural products remain an important source of drug leads covering unique chemical space and providing significant therapeutic value for the control of cancer and infectious diseases resistant to current drugs. Here, we determined the antiproliferative activity of a natural product manzamine A (1) from an Indo-Pacific sponge following various in vitro cellular assays targeting cervical cancer (C33A, HeLa, SiHa, and CaSki). Our data demonstrated the antiproliferative effects of 1 at relatively low and non-cytotoxic concentrations (up to 4 μM). Mechanistic investigations confirmed that 1 blocked cell cycle progression in SiHa and CaSki cells at G1/S phase and regulated cell cycle-related genes, including restoration of p21 and p53 expression. In apoptotic assays, HeLa cells showed the highest sensitivity to 1 as compared to other cell types (C33A, SiHa, and CaSki). Interestingly, 1 decreased the levels of the oncoprotein SIX1, which is associated with oncogenesis in cervical cancer. To further investigate the structure-activity relationship among manzamine A (1) class with potential antiproliferative activity, molecular networking facilitated the efficient identification, dereplication, and assignment of structures from the manzamine class and revealed the significant potential in the design of optimized molecules for the treatment of cervical cancer. These data suggest that this sponge-derived natural product class warrants further attention regarding the design and development of novel manzamine analogues, which may be efficacious for preventive and therapeutic treatment of cancer. Additionally, this study reveals the significance of protecting fragile marine ecosystems from climate change-induced loss of species diversity.
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Affiliation(s)
- Dev Karan
- Department
of Pathology, MCW Cancer Center and Prostate Cancer Center of Excellence, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, Wisconsin, United States
| | - Seema Dubey
- Department
of Pathology, MCW Cancer Center and Prostate Cancer Center of Excellence, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, Wisconsin, United States
| | - Lucia Pirisi
- Department
of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, South Carolina, United States
| | - Alexis Nagel
- Department
of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, South Carolina, United States
| | - Ivett Pina
- Department
of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, South Carolina, United States
| | - Yeun-Mun Choo
- Department
of Chemistry, University of Malaya, Kuala Lumpur, Malaysia
| | - Mark T Hamann
- Department
of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, South Carolina, United States
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20
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Liu J, Pandey P, Wang X, Adams K, Qi X, Chen J, Sun H, Hou Q, Ferreira D, Doerksen RJ, Hamann MT, Li S. Hepatoprotective Tetrahydrobenzocyclooctabenzofuranone Lignans from Kadsura longipedunculata. J Nat Prod 2019; 82:2842-2851. [PMID: 31556297 DOI: 10.1021/acs.jnatprod.9b00576] [Citation(s) in RCA: 5] [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: 06/10/2023]
Abstract
Three new tetrahydrobenzocyclooctabenzofuranone lignan glucosides, longipedunculatins A-C (1-3), a new dibenzocyclooctadiene lignan glucoside, longipedunculatin D (4), a new dibenzocyclooctadiene lignan (5), five new tetrahydrobenzocyclooctabenzofuranone lignans (6-10), and two new simple lignans (11, 12) were isolated from the roots of Kadsura longipedunculata. Their structures and absolute configurations were established using a combination of MS, NMR, and experimental and calculated electronic circular dichroism data. Compound 7 showed moderate hepatoprotective activity against N-acetyl-p-aminophenol-induced toxicity in HepG2 cells with a cell survival rate at 10 μM of 50.8%. Compounds 2, 7, and 12 showed significant in vitro inhibitory effects with an inhibition rate of 55.1%, 74.9%, and 89.8% on nitric oxide production assays at 10 μM.
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Affiliation(s)
- Jiabao Liu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing 100050 , People's Republic of China
| | | | - Xiaojuan Wang
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy , Medical University of South Carolina , Charleston , South Carolina 29425 , United States
| | | | - Xinzhu Qi
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Jiabao Chen
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Hua Sun
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Qi Hou
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing 100050 , People's Republic of China
| | | | | | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy , Medical University of South Carolina , Charleston , South Carolina 29425 , United States
| | - Shuai Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences & Peking Union Medical College , Beijing 100050 , People's Republic of China
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21
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Carruthers NJ, Stemmer PM, Media J, Swartz K, Wang X, Aube N, Hamann MT, Valeriote F, Shaw J. The anti-MRSA compound 3-O-alpha-L-(2″,3″-di-p-coumaroyl)rhamnoside (KCR) inhibits protein synthesis in Staphylococcus aureus. J Proteomics 2019; 210:103539. [PMID: 31629958 DOI: 10.1016/j.jprot.2019.103539] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 05/07/2019] [Revised: 09/05/2019] [Accepted: 09/27/2019] [Indexed: 11/16/2022]
Abstract
Methicillin-resistant S aureus (MRSA) contributes to patient mortality and extended hospital stays. 3-O-alpha-L-(2″,3″-di-p-coumaroyl)rhamnoside (KCR) is a natural product antibiotic that is effective against MRSA but has no known mechanism of action (MOA). We used proteomics to identify the MOA for KCR. Methicillin sensitive S aureus and a mixture of four KCR stereoisomers were tested. A time-kill assay was used to choose a 4 h treatment using KCR at 5× its MIC for proteomic analysis. S aureus was treated in triplicate with KCR, oxacillin or vehicle and quantitative proteomic analysis was carried out using isobaric tags and mass spectrometry. 1190 proteins were identified and 552 were affected by KCR (q < 0.01). Ontology analysis identified 6 distinct translation-related categories that were affected by KCR (PIANO, 10% false-discovery rate) including structural constituent of ribosome, translation, rRNA binding, tRNA binding, tRNA processing and aminoacyl-tRNA ligase activity. Median fold changes (KCR vs Control) for small and large ribosomal components were 1.46 and 1.43 respectively. KCR inhibited the production of luciferase protein in an in vitro assay (IC50 39.6 μg/ml). Upregulation of translation-related proteins in response to KCR indicates that KCR acts to disrupt S aureus protein synthesis. This was confirmed with an in vitro transcription/translation assay. SIGNIFICANCE: Methicillin-resistant S aureus (MRSA) contributes to patient mortality and extended hospital stays. 3-O-alpha-L-(2″,3″-di-p-coumaroyl)rhamnoside (KCR) is a natural product antibiotic that is effective against MRSA but has no known mechanism of action (MOA). Using proteomic analysis we determined that KCR acts by inhibiting protein synthesis. KCR is an exciting novel antibiotic and this work represents an important step in its development towards clinical use.
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Affiliation(s)
- Nicholas J Carruthers
- Institute of Environmental Health Sciences, Wayne State University, Detroit, MI 48201, USA; Wayne State University, Institute of Environmental Health Sciences, 2309 Scott Hall, 540 E Canfield Ave, Detroit, MI 48202, United States of America.
| | - Paul M Stemmer
- Institute of Environmental Health Sciences, Wayne State University, Detroit, MI 48201, USA.
| | - Joe Media
- Department of Internal Medicine, Henry Ford Hospital, Detroit, MI 48201, USA.
| | - Ken Swartz
- Department of Internal Medicine, Henry Ford Hospital, Detroit, MI 48201, USA.
| | - Xiaojuan Wang
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Nicholas Aube
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425, USA.
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425, USA.
| | - Frederick Valeriote
- Department of Internal Medicine, Henry Ford Hospital, Detroit, MI 48201, USA.
| | - Jiajiu Shaw
- Henry Ford Health System, Detroit, MI, USA; 21st Century Therapeutics, Detroit, MI 48201, USA
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22
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Abstract
Highly oxygenated nortriterpenoids are the principle bioactive chemical constituents isolated from plants of the genera Schisandra and Kadsura. The stereochemistry of these molecules remains a highly challenging problem to solve. To establish the stereochemistry and develop a general nuclear magnetic resonance-electric circular dichroism-computational approach to solve these complex metabolites, we reviewed the published methods to solve the stereochemistry of these triterpenoids. A key goal of this review is to provide a protocol to solve the problems hampering the assignment of the relative absolute configurations of other members of this natural product class.
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Affiliation(s)
- Xiaojuan Wang
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, USA
| | - Mark T. Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, USA
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23
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Westemeier E, Pina I, Hamann MT, Hamann MJ. Purification of Recombinant Zika Virus NS3 Helicase for the Identification of an Antiviral Drug. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.782.21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Ivett Pina
- SCCP Drug Discovery and Biomedical SciencesMedical University of South CarolinaCharlestonSC
| | - Mark T Hamann
- SCCP Drug Discovery and Biomedical SciencesMedical University of South CarolinaCharlestonSC
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24
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Zou Y, Wang X, Sims J, Wang B, Pandey P, Welsh CL, Stone RP, Avery MA, Doerksen RJ, Ferreira D, Anklin C, Valeriote FA, Kelly M, Hamann MT. Computationally Assisted Discovery and Assignment of a Highly Strained and PANC-1 Selective Alkaloid from Alaska's Deep Ocean. J Am Chem Soc 2019; 141:4338-4344. [PMID: 30758203 DOI: 10.1021/jacs.8b11403] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We report here the orchestration of molecular ion networking and a set of computationally assisted structural elucidation approaches in the discovery of a new class of pyrroloiminoquinone alkaloids that possess selective bioactivity against pancreatic cancer cell lines. Aleutianamine represents the first in a new class of pyrroloiminoquinone alkaloids possessing a highly strained multibridged ring system, discovered from Latrunculia ( Latrunculia) austini Samaai, Kelly & Gibbons, 2006 (class Demospongiae, order Poecilosclerida, family Latrunculiidae) recovered during a NOAA deep-water exploration of the Aleutian Islands. The molecule was identified with the guidance of mass spectrometry, nuclear magnetic resonance, and molecular ion networking (MoIN) analysis. The structure of aleutianamine was determined using extensive spectroscopic analysis in conjunction with computationally assisted quantifiable structure elucidation tools. Aleutianamine exhibited potent and selective cytotoxicity toward solid tumor cell lines including pancreatic cancer (PANC-1) with an IC50 of 25 nM and colon cancer (HCT-116) with an IC50 of 1 μM, and represents a potent and selective candidate for advanced preclinical studies.
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Affiliation(s)
| | - Xiaojuan Wang
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy , Medical University of South Carolina , Charleston , South Carolina 29425 , United States
| | | | | | | | | | - Robert P Stone
- NOAA Fisheries, Alaska Fisheries Science Center , Auke Bay Laboratories , 17109 Point Lena Loop Road , Juneau , Alaska 99801 , United States
| | | | | | | | - Clemens Anklin
- Bruker BioSpin, 15 Fortune Drive , Billerica , Massachusetts 01821 , United States
| | - Frederick A Valeriote
- Henry Ford Hospital , Department of Internal Medicine, Division of Hematology and Oncology , Detroit , Michigan 48202 , United States
| | - Michelle Kelly
- National Institute of Water and Atmospheric Research (NIWA) Ltd., 41 Market Place, Viaduct Harbour , Auckland 1010 , New Zealand
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy , Medical University of South Carolina , Charleston , South Carolina 29425 , United States
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25
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Abstract
Three bromopyrrole alkaloids (1–3) were isolated from the acetone extracts of Didiscus oxeata during chemical and biological investigation of Caribbean and Indo-Pacific marine sponges. The structures were established by spectroscopic methods. Mukanadin D (3) was obtained for the first time as a naturally-occurring C11 bromopyrrole alkaloid.
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Affiliation(s)
- Jin-Feng Hu
- Department of Pharmacognosy and National Center for Natural Products Research (NCNPR), School of Pharmacy, The University of Mississippi, University, MS 38677, USA
| | - Jiangnan Peng
- Department of Pharmacognosy and National Center for Natural Products Research (NCNPR), School of Pharmacy, The University of Mississippi, University, MS 38677, USA
| | - Abul B. Kazi
- Department of Pharmacognosy and National Center for Natural Products Research (NCNPR), School of Pharmacy, The University of Mississippi, University, MS 38677, USA
| | - Michelle Kelly
- National Center for Aquatic Biodiversity and Biosecurity, National Institute of Water & Atmospheric Research (NIWA) Ltd, Newmarket, Auckland, New Zealand
| | - Mark T. Hamann
- Department of Pharmacognosy and National Center for Natural Products Research (NCNPR), School of Pharmacy, The University of Mississippi, University, MS 38677, USA
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26
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Bashyal B, Desai P, Rao KV, Hamann MT, Avery BA, Reed JK, Avery MA. Terpenes from Eunicea Laciniata and Plexaurella Nutans. Journal of Chemical Research 2019. [DOI: 10.3184/030823406776330729] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A new 7,8–epoxydolabella–3(E)–12(18)–diene (1), diterpenoid together with three known compounds were isolated from a Honduras gorgonian Eunicea laciniata. The relative stereochemistry of 1 was established by spectroscopic studies and the antiprotozoal and antimicrobial activities of dolabellane diterpenoids 2–4 are reported. Three known cadinane type sesquiterpenes were also isolated from Honduras gorgonian Plexaurella nutans.
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Affiliation(s)
- Bharat Bashyal
- Department of Medicinal Chemistry, University of Mississippi, MS 38677, USA
| | - Prashant Desai
- Department of Medicinal Chemistry, University of Mississippi, MS 38677, USA
| | - Karumanchi V. Rao
- Department of Pharmacognosy and National Center for Natural Product Research, University of Mississippi, MS 38677, USA
| | - Mark T. Hamann
- Department of Pharmacognosy and National Center for Natural Product Research, University of Mississippi, MS 38677, USA
| | - Bonnie A. Avery
- Department pf Pharmaceutics, School of Pharmacy, University of Mississippi, MS 38677, USA
| | - John K. Reed
- Harbor Branch Oceanographic Institution, Fort Pierce, Florida, USA
| | - Mitchell A. Avery
- Department of Medicinal Chemistry, University of Mississippi, MS 38677, USA
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27
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Chen X, Ding Y, Forrest B, Oh J, Boussert SM, Hamann MT. Lemon yellow #15 a new highly stable, water soluble food colorant from the peel of Citrus limon. Food Chem 2019; 270:251-256. [PMID: 30174043 DOI: 10.1016/j.foodchem.2018.07.055] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 03/25/2018] [Revised: 07/06/2018] [Accepted: 07/09/2018] [Indexed: 12/26/2022]
Abstract
To provide stable and low-cost naturally derived yellow pigments, a variety of food byproducts were evaluated and the constituents of lemon peel have emerged yielding a highly promising natural product with applications as a food dye. Here we report a new, highly stable and water soluble food dye called yellow #15 from the ethanol extract of the zest of Citrus limon. The structure of lemon yellow #15 was carefully assigned on the basis of spectroscopic data, including 1D and 2D NMR spectroscopy, and the absolute configuration was established by comparison of the experimental CD with calculated electronic circular dichroism (ECD) spectral data. CIELAB values and Delta CIELAB were measured and revealed this new water-soluble pigment has superior light stability relative to other natural products used as food dyes.
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Affiliation(s)
- Xiaoyan Chen
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Yuanqing Ding
- National Center for Natural Products Research, Department of BioMolecular Sciences, Division of Pharmacognosy, and Research Institute of Pharmaceutical Sciences, School of Pharmacy, The University of Mississippi, Oxford, MS 38677, USA
| | - Billy Forrest
- Division of Pharmacognosy, School of Pharmacy, The University of Mississippi, Oxford, MS 38677, USA
| | - Joonseok Oh
- Division of Pharmacognosy, School of Pharmacy, The University of Mississippi, Oxford, MS 38677, USA
| | - Stephanie M Boussert
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, SC 29401, USA
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, USA.
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28
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Abstract
Pancreatic cancer one of the most deadly cancers and is an increasingly significant concern for global health. The death rates for pancreatic cancer have changed little over time, even with recent expansions of first-line drugs to treat pancreatic cancer there has been little improvement in patient prognosis. Any improvements in treatment strategies will come as a much-needed reprieve to patients diagnosed with this uniquely-challenging disease. Greater attention is needed regarding the identification and development of novel chemotherapeutic strategies with unique mechanisms of action. The marine environment with its particularity has provided a diverse source of novel structural compounds with interesting activities. The marine natural products reported from 2006 to 2018 with compelling activity and potential for the control of pancreatic cancer based on in vitro and in vivo results will be summarized. A key goal of this review is to draw attention to those molecules that warrant additional preclinical development studies.
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Affiliation(s)
- Xiaojuan Wang
- Departments of Drug Discovery, Biomedical Sciences, and Public Health Sciences, Hollings Cancer Center, College of Pharmacy, Medical University of South Carolina, Charleston, SC, United States
| | - Mark T Hamann
- Departments of Drug Discovery, Biomedical Sciences, and Public Health Sciences, Hollings Cancer Center, College of Pharmacy, Medical University of South Carolina, Charleston, SC, United States.
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29
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Wang X, Liu J, Pandey P, Fronczek FR, Doerksen RJ, Chen J, Qi X, Zhang P, Ferreira D, Valeriote FA, Sun H, Li S, Hamann MT. Computationally Assisted Assignment of the Kadsuraols, a Class of Chemopreventive Agents for the Control of Liver Cancer. Org Lett 2018; 20:5559-5563. [PMID: 30192555 DOI: 10.1021/acs.orglett.8b02207] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Kadsuraols A-C (1-3), which are tetrahydrocyclobutaphenanthrofuranone-type lignans with a new carbon skeleton comprising a four-membered ring across C-1'-C-8, have been isolated from the roots of Kadsura longipedunculata. Their structures and absolute configurations were unambiguously determined using nuclear magnetic resonance, X-ray diffraction crystallography, DP4+ calculations, and computed and experimental electronic circular dichroism spectra. Kadsuraol C (3) exhibited hepatoprotective activity against N-acetyl- p-aminophenol (APAP)-induced toxicity. The compounds showed no cytotoxicity at 10 μM in a zone assay.
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Affiliation(s)
- Xiaojuan Wang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China.,Department of Drug Discovery and Biomedical Sciences, College of Pharmacy , Medical University of South Carolina , Charleston , South Carolina 29425 , United States
| | - Jiabao Liu
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | | | - Frank R Fronczek
- Department of Chemistry , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
| | | | - Jiabao Chen
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Xinzhu Qi
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Peicheng Zhang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | | | - Frederick A Valeriote
- Department of Internal Medicine, Division of Hematology and Oncology , Henry Ford Health System , Detroit , Michigan 48202 , United States
| | - Hua Sun
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Shuai Li
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy , Medical University of South Carolina , Charleston , South Carolina 29425 , United States
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30
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Simithy J, Fuanta NR, Alturki M, Hobrath JV, Wahba AE, Pina I, Rath J, Hamann MT, DeRuiter J, Goodwin DC, Calderón AI. Slow-Binding Inhibition of Mycobacterium tuberculosis Shikimate Kinase by Manzamine Alkaloids. Biochemistry 2018; 57:4923-4933. [PMID: 30063132 DOI: 10.1021/acs.biochem.8b00231] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tuberculosis represents a significant public health crisis. There is an urgent need for novel molecular scaffolds against this pathogen. We screened a small library of marine-derived compounds against shikimate kinase from Mycobacterium tuberculosis ( MtSK), a promising target for antitubercular drug development. Six manzamines previously shown to be active against M. tuberculosis were characterized as MtSK inhibitors: manzamine A (1), 8-hydroxymanzamine A (2), manzamine E (3), manzamine F (4), 6-deoxymanzamine X (5), and 6-cyclohexamidomanzamine A (6). All six showed mixed noncompetitive inhibition of MtSK. The lowest KI values were obtained for 6 across all MtSK-substrate complexes. Time-dependent analyses revealed two-step, slow-binding inhibition. The behavior of 1 was typical; initial formation of an enzyme-inhibitor complex (EI) obeyed an apparent KI of ∼30 μM with forward ( k5) and reverse ( k6) rate constants for isomerization to an EI* complex of 0.18 and 0.08 min-1, respectively. In contrast, 6 showed a lower KI for the initial encounter complex (∼1.5 μM), substantially faster isomerization to EI* ( k5 = 0.91 min-1), and slower back conversion of EI* to EI ( k6 = 0.04 min-1). Thus, the overall inhibition constants, KI*, for 1 and 6 were 10 and 0.06 μM, respectively. These findings were consistent with docking predictions of a favorable binding mode and a second, less tightly bound pose for 6 at MtSK. Our results suggest that manzamines, in particular 6, constitute a new scaffold from which drug candidates with novel mechanisms of action could be designed for the treatment of tuberculosis by targeting MtSK.
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Affiliation(s)
- Johayra Simithy
- Department of Drug Discovery and Development, Harrison School of Pharmacy , Auburn University , 4306 Walker Building , Auburn , Alabama 36849 , United States
| | - Ngolui Rene Fuanta
- Department of Chemistry and Biochemistry , Auburn University , 179 Chemistry Building , Auburn , Alabama 36849 , United States
| | - Mansour Alturki
- Department of Drug Discovery and Development, Harrison School of Pharmacy , Auburn University , 4306 Walker Building , Auburn , Alabama 36849 , United States
| | - Judith V Hobrath
- Department of Chemistry , University of Alabama at Birmingham , Birmingham , Alabama 35294 , United States
| | - Amir E Wahba
- Chemistry Department, Faculty of Science , Damietta University , Damietta , Egypt
| | - Ivett Pina
- Departments of Drug Discovery & Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine , The Medical University of South Carolina , 70 President Street, MSP 139 , Charleston , South Carolina 29425 , United States
| | - Jnanendra Rath
- Department of Botany , Visva-Bharati University , Santiniketan , West Bengal 731235 , India
| | - Mark T Hamann
- Departments of Drug Discovery & Biomedical Sciences and Public Health, Colleges of Pharmacy and Medicine , The Medical University of South Carolina , 70 President Street, MSP 139 , Charleston , South Carolina 29425 , United States
| | - Jack DeRuiter
- Department of Drug Discovery and Development, Harrison School of Pharmacy , Auburn University , 4306 Walker Building , Auburn , Alabama 36849 , United States
| | - Douglas C Goodwin
- Department of Chemistry and Biochemistry , Auburn University , 179 Chemistry Building , Auburn , Alabama 36849 , United States
| | - Angela I Calderón
- Department of Drug Discovery and Development, Harrison School of Pharmacy , Auburn University , 4306 Walker Building , Auburn , Alabama 36849 , United States
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31
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Simithy J, Fuanta NR, Hobrath JV, Kochanowska-Karamyan A, Hamann MT, Goodwin DC, Calderón AI. Mechanism of irreversible inhibition of Mycobacterium tuberculosis shikimate kinase by ilimaquinone. Biochim Biophys Acta Proteins Proteom 2018; 1866:731-739. [PMID: 29654976 DOI: 10.1016/j.bbapap.2018.04.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 04/01/2018] [Accepted: 04/10/2018] [Indexed: 01/03/2023]
Abstract
Ilimaquinone (IQ), a marine sponge metabolite, has been considered as a potential therapeutic agent for various diseases due to its broad range of biological activities. We show that IQ irreversibly inactivates Mycobacterium tuberculosis shikimate kinase (MtSK) through covalent modification of the protein. Inactivation occurred with an apparent second-order rate constant of about 60 M-1 s-1. Following reaction with IQ, LC-MS analyses of intact MtSK revealed covalent modification of MtSK by IQ, with the concomitant loss of a methoxy group, suggesting a Michael-addition mechanism. Evaluation of tryptic fragments of IQ-derivatized MtSK by MS/MS demonstrated that Ser and Thr residues were most frequently modified with lesser involvement of Lys and Tyr. In or near the MtSK active site, three residues of the P-loop (K15, S16, and T17) as well as S77, T111, and S44 showed evidence of IQ-dependent derivatization. Accordingly, inclusion of ATP in IQ reactions with MtSK partially protected the enzyme from inactivation and limited IQ-based derivatization of K15 and S16. Additionally, molecular docking models for MtSK-IQ were generated for IQ-derivatized S77 and T111. In the latter, ATP was observed to sterically clash with the IQ moiety. Out of three other enzymes evaluated, lactate dehydrogenase was derivatized and inactivated by IQ, but pyruvate kinase and catalase-peroxidase (KatG) were unaffected. Together, these data suggest that IQ is promiscuous (though not entirely indiscriminant) in its reactivity. As such, the potential of IQ as a lead in the development of antitubercular agents directed against MtSK or other targets is questionable.
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Affiliation(s)
- Johayra Simithy
- Department of Drug Discovery and Development, Harrison School of Pharmacy, 3306 Walker Building, Auburn University, Auburn, AL 36849, USA
| | - Ngolui Rene Fuanta
- Department of Chemistry and Biochemistry, 179 Chemistry Building, Auburn University, Auburn, AL 36849, USA
| | - Judith V Hobrath
- Drug Discovery Unit, College of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom
| | - Anna Kochanowska-Karamyan
- Department of Pharmaceutical Sciences, Texas Tech University HSC, 1300 S. Coulter, Amarillo, TX 79106, USA
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Douglas C Goodwin
- Department of Chemistry and Biochemistry, 179 Chemistry Building, Auburn University, Auburn, AL 36849, USA
| | - Angela I Calderón
- Department of Drug Discovery and Development, Harrison School of Pharmacy, 3306 Walker Building, Auburn University, Auburn, AL 36849, USA.
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Liu J, Pandey P, Wang X, Qi X, Chen J, Sun H, Zhang P, Ding Y, Ferreira D, Doerksen RJ, Hamann MT, Li S. Hepatoprotective Dibenzocyclooctadiene and Tetrahydrobenzocyclooctabenzofuranone Lignans from Kadsura longipedunculata. J Nat Prod 2018; 81:846-857. [PMID: 29595972 DOI: 10.1021/acs.jnatprod.7b00934] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Five new dibenzocyclooctadiene lignans, longipedlignans A-E (1-5), five new tetrahydrobenzocyclooctabenzofuranones (6-10), and 18 known analogues (11-28) were isolated from the roots of Kadsura longipedunculata. Compounds 6-10 are new spirobenzofuranoid-dibenzocyclooctadiene-type lignans. Their structures and absolute configurations were established using a combination of MS, NMR, and electronic circular dichroism data. Spirobenzofuranoids 6 and 15 showed moderate hepatoprotective activity against N-acetyl- p-aminophenol-induced toxicity in HepG2 cells with cell survival rates at 10 μM of 52.2% and 50.2%, respectively.
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Affiliation(s)
- Jiabao Liu
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | | | - Xiaojuan Wang
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy , Medical University of South Carolina , Charleston , South Carolina 29425 , United States
| | - Xinzhu Qi
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Jiabao Chen
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Hua Sun
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | - Peicheng Zhang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
| | | | | | | | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy , Medical University of South Carolina , Charleston , South Carolina 29425 , United States
| | - Shuai Li
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica , Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing 100050 , People's Republic of China
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Chen XY, Zhang T, Wang X, Hamann MT, Kang J, Yu DQ, Chen RY. A Chemical Investigation of the Leaves of Morus alba L. Molecules 2018; 23:molecules23051018. [PMID: 29701695 PMCID: PMC6102566 DOI: 10.3390/molecules23051018] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Revised: 04/21/2018] [Accepted: 04/24/2018] [Indexed: 02/07/2023] Open
Abstract
The leaves of Morus alba L. are an important herbal medicine in Asia. The systematic isolation of the metabolites of the leaves of Morus alba L. was achieved using a combination of liquid chromatography techniques. The structures were elucidated by spectroscopic data analysis and the absolute configuration was determined based on electronic circular dichroism (ECD) spectroscopic data and hydrolysis experiments. Their biological activity was evaluated using different biological assays, such as the assessment of their capacity to inhibit the aldose reductase enzyme; the determination of their cytotoxic activity and the evaluation of their neuroprotective effects against the deprivation of serum or against the presence of nicouline. Chemical investigation of the leaves of Morus alba L. resulted in four new structures 1⁻4 and a known molecule 5. Compounds 2 and 5 inhibited aldose reductase with IC50 values of 4.33 μM and 6.0 μM compared with the potent AR inhibitor epalrestat (IC50 1.88 × 10−3 μM). Pretreatment with compound 3 decreased PC12 cell apoptosis subsequent serum deprivation condition and pretreatment with compound 5 decreased nicouline-induced PC12 cell apoptosis as compared with control cells (p < 0.001).
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Affiliation(s)
- Xiao-Yan Chen
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, USA.
| | - Ting Zhang
- Institute of Medical Information & Library, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100020, China.
| | - Xin Wang
- Beijing Key Laboratory of Bioactive Substances and Function Foods, Beijing Union University, Beijing 100191, China.
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, USA.
| | - Jie Kang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
| | - De-Quan Yu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
| | - Ruo-Yun Chen
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
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Shaw J, Swartz K, Valeriote F, Media J, Chen B, Hamann MT, Wang X. Identification of the Metabolites of a Novel Anti-MRSA Compound, Kaempferol-3- O-Alpha-L-(2″,3″-di- p-coumaroyl)rhamnoside (KCR), Extracted from American Sycamore. Nat Prod Commun 2018. [DOI: 10.1177/1934578x1801300321] [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] [Indexed: 11/16/2022] Open
Abstract
Fractionation of an extract from American sycamore leaves produced the small molecule, kaempferol-3- O-alpha-L-(2″,3″-di- p-coumaroyl)rhamnoside (KCR), which exists in four stereoisomeric forms ( EE, EZ, ZE, and ZZ) at the olefin in the p-coumaroyl; all four isomers exhibit potent anti-MRSA activity in vitro. As part of the preclinical development of KCR, we set out to investigate the metabolites of KCR in mouse plasma as a prelude of ADME studies and therapeutic assessment. When KCR was added to mouse plasma at 37 °C, two new HPLC peaks appeared with increasing intensity as the incubation time increased; their retention times were shorter than that of KCR indicating that KCR was metabolized to produce two compounds that were more polar. HPLC results indicated that the two metabolites mainly came from the ZE and EE isomers and that the ZZ isomer was the most stable. Based on their respective HPLC retention times and UV spectra, these two metabolites were tentatively identified as p-coumaric acid and afzelin; both of which are more polar than KCR. The molecular weights of both metabolites were then confirmed by a Waters Acquity UPLC system with a QDa mass detector. UPLC chromatograms and molecular ions of metabolites 1 and 2 match well with those of reference materials, p-coumaric acid and afzelin, thus confirming the identities of the two major metabolites of KCR. In summary, KCR was metabolized in mouse plasma and two major metabolites ( p-coumaric acid and afzelin) were identified; the metabolites were mainly converted from the ZE and EE isomers.
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Affiliation(s)
- Jiajiu Shaw
- 21st Century Therapeutics, 440 Burroughs St., Suite 447, Detroit, Michigan 48202, USA
- Henry Ford Health System, Department of Internal Medicine, 440 Burroughs St., Rm 415, Detroit, Michigan 48202, USA
| | - Kenneth Swartz
- 21st Century Therapeutics, 440 Burroughs St., Suite 447, Detroit, Michigan 48202, USA
| | - Frederick Valeriote
- Henry Ford Health System, Department of Internal Medicine, 440 Burroughs St., Rm 415, Detroit, Michigan 48202, USA
| | - Joseph Media
- Henry Ford Health System, Department of Internal Medicine, 440 Burroughs St., Rm 415, Detroit, Michigan 48202, USA
| | - Ben Chen
- 21st Century Therapeutics, 440 Burroughs St., Suite 447, Detroit, Michigan 48202, USA
| | - Mark T. Hamann
- Oxford Laboratories, 213 Timber Lane, Oxford, MS 38655, USA
| | - Xiaojuan Wang
- Medical University of South Carolina, Drug Discovery Building, 70 President Street, MSC 139, Charleston, SC 29425, USA
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Gogineni V, Hamann MT. Marine natural product peptides with therapeutic potential: Chemistry, biosynthesis, and pharmacology. Biochim Biophys Acta Gen Subj 2018; 1862:81-196. [PMID: 28844981 PMCID: PMC5918664 DOI: 10.1016/j.bbagen.2017.08.014] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 08/07/2017] [Accepted: 08/09/2017] [Indexed: 12/21/2022]
Abstract
The oceans are a uniquely rich source of bioactive metabolites, of which sponges have been shown to be among the most prolific producers of diverse bioactive secondary metabolites with valuable therapeutic potential. Much attention has been focused on marine bioactive peptides due to their novel chemistry and diverse biological properties. As summarized in this review, marine peptides are known to exhibit various biological activities such as antiviral, anti-proliferative, antioxidant, anti-coagulant, anti-hypertensive, anti-cancer, antidiabetic, antiobesity, and calcium-binding activities. This review focuses on the chemistry and biology of peptides isolated from sponges, bacteria, cyanobacteria, fungi, ascidians, and other marine sources. The role of marine invertebrate microbiomes in natural products biosynthesis is discussed in this review along with the biosynthesis of modified peptides from different marine sources. The status of peptides in various phases of clinical trials is presented, as well as the development of modified peptides including optimization of PK and bioavailability.
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Affiliation(s)
- Vedanjali Gogineni
- Department of BioMolecular Sciences, Division of Medicinal Chemistry, School of Pharmacy, The University of Mississippi, University, MS, United States.
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy and Public Health Sciences, Medical University of South Carolina, Charleston, SC, United States.
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Wang X, Liu J, Pandey P, Chen J, Fronczek FR, Parnham S, Qi X, Doerksen RJ, Ferreira D, Sun H, Li S, Hamann MT. Assignment of the absolute configuration of hepatoprotective highly oxygenated triterpenoids using X-ray, ECD, NMR J-based configurational analysis and HSQC overlay experiments. Biochim Biophys Acta Gen Subj 2017; 1861:3089-3095. [PMID: 28919469 DOI: 10.1016/j.bbagen.2017.09.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 08/24/2017] [Accepted: 09/01/2017] [Indexed: 10/18/2022]
Abstract
BACKGROUND The plants of the genus Kadsura are widely distributed in China, South Korea, and Japan. Their roots and stems are traditionally used to treat blood diseases and pain. The main bioactive constituents of Kadsura longipedunculata comprise highly oxygenated triterpenoids. Schiartane-type nortriterpenoids showed anti-HIV, anti-HBV, and cytotoxic bioactivities. For such compounds, the absolute configuration influences the bioactivities, and hence its unambiguous determination is essential. In this work, the absolute configurations of three highly oxygenated schiartane-type nortriterpenoids were unequivocally assigned using X-ray, ECD, and J-based configuration analysis and HSQC overlay data. METHODS The ethanol extract of Kadsura longipedunculata Finet et Gagnep was purified by column chromatography using silica, Sephadex LH-20, and ODS as substrates. To help assign the absolute configuration of schiartane-type nortriterpenoids, X-ray diffraction analysis, ECD experiment compared to ab initio computed data, DP4+ analysis, HSQC overlay, NOESY, and J-based configuration analysis were carried out. Hetero- and homo-nuclear coupling constants were extracted from HETLOC experiments. RESULTS Three new highly oxygenated triterpenoids, micrandilactone I (1), micrandilactone J (2), and 22,23-di-epi-micrandilactone J (3) were isolated. Their 2D structures were solved using NMR and HRESIMS data and their absolute configurations were elucidated using X-ray diffraction analysis, ECD experimental results compared to ab initio computed spectra, HSQC overlay, DP4+, NOESY, and J-based configuration analysis. Micrandilactone I (1) and 22,23-di-epi-micrandilactone J (3) showed moderate hepatoprotective activity against APAP-induced toxicity in HepG2 cells with cell survival rates of 53.0 and 50.2%, respectively, at 10μM (bicyclol, 49.0%), while micrandilactone J (2) was inactive. GENERAL SIGNIFICANCE This is the first comprehensive stereochemical assignment of a non-crystalline schiartane-type nortriterpenoid like 3. This general protocol may contribute towards solving the problems hampering the assignment of the absolute configurations of other members of this class of nortriterpenoids.
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Affiliation(s)
- Xiaojuan Wang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China; Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, United States
| | - Jiabao Liu
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Pankaj Pandey
- Department of BioMolecular Sciences, Division of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, MS 38677-1848, United States
| | - Jiabao Chen
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Frank R Fronczek
- Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, United States
| | - Stuart Parnham
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, United States
| | - Xinzhu Qi
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Robert J Doerksen
- Department of BioMolecular Sciences, Division of Medicinal Chemistry, Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, MS 38677-1848, United States
| | - Daneel Ferreira
- Department of BioMolecular Sciences, Division of Pharmacognosy, Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, MS 38677-1848, United States
| | - Hua Sun
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China
| | - Shuai Li
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China.
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, United States.
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Ibrahim MA, El-Alfy AT, Ezel K, Radwan MO, Shilabin AG, Kochanowska-Karamyan AJ, Abd-Alla HI, Otsuka M, Hamann MT. Marine Inspired 2-(5-Halo-1H-indol-3-yl)-N,N-dimethylethanamines as Modulators of Serotonin Receptors: An Example Illustrating the Power of Bromine as Part of the Uniquely Marine Chemical Space. Mar Drugs 2017; 15:md15080248. [PMID: 28792478 PMCID: PMC5577603 DOI: 10.3390/md15080248] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 07/28/2017] [Accepted: 07/31/2017] [Indexed: 12/18/2022] Open
Abstract
In previous studies, we have isolated several marine indole alkaloids and evaluated them in the forced swim test (FST) and locomotor activity test, revealing their potential as antidepressant and sedative drug leads. Amongst the reported metabolites to display such activities was 5-bromo-N,N-dimethyltryptamine. Owing to the importance of the judicious introduction of halogens into drug candidates, we synthesized two series built on a 2-(1H-indol-3-yl)-N,N-dimethylethanamine scaffold with different halogen substitutions. The synthesized compounds were evaluated for their in vitro and in vivo antidepressant and sedative activities using the mouse forced swim and locomotor activity tests. Receptor binding studies of these compounds to serotonin (5-HT) receptors were conducted. Amongst the prepared compounds, 2-(1H-indol-3-yl)-N,N-dimethyl-2-oxoacetamide (1a), 2-(5-bromo-1H-indol-3-yl)-N,N-dimethyl-2-oxoacetamide (1d), 2-(1H-indol-3-yl)-N,N-dimethylethanamine (2a), 2-(5-chloro-1H-indol-3-yl)-N,N-dimethylethanamine (2c), 2-(5-bromo-1H-indol-3-yl)-N,N-dimethylethanamine (2d), and 2-(5-iodo-1H-indol-3-yl)-N,N-dimethylethanamine (2e) have been shown to possess significant antidepressant-like action, while compounds 2c, 2d, and 2e exhibited potent sedative activity. Compounds 2a, 2c, 2d, and 2e showed nanomolar affinities to serotonin receptors 5-HT1A and 5-HT₇. The in vitro data indicates that the antidepressant action exerted by these compounds in vivo is mediated, at least in part, via interaction with serotonin receptors. The data presented here shows the valuable role that bromine plays in providing novel chemical space and electrostatic interactions. Bromine is ubiquitous in the marine environment and a common element of marine natural products.
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Affiliation(s)
- Mohamed A Ibrahim
- Department of Pharmacognosy, The University of Mississippi, University, MS 38677, USA.
- National Center for Natural Products Research, the University of Mississippi, University, MS 38677, USA.
- Department of Chemistry of Natural Compounds, National Research Center, Dokki 12622, Cairo, Egypt.
| | - Abir T El-Alfy
- Biopharmaceutical Sciences Department, Medical College of Wisconsin Pharmacy School, Milwaukee, WI 53226, USA.
- Department of Pharmacology, The University of Mississippi, University, MS 38677, USA.
| | - Kelly Ezel
- Department of Pharmacology, The University of Mississippi, University, MS 38677, USA.
| | - Mohamed O Radwan
- Department of Chemistry of Natural Compounds, National Research Center, Dokki 12622, Cairo, Egypt.
- Department of Bioorganic Medicinal Chemistry, Faculty of Life Sciences, Kumamoto University, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Abbas G Shilabin
- Department of Pharmacognosy, The University of Mississippi, University, MS 38677, USA.
- Department of Chemistry, East Tennessee State University, Johnson City, TN 37614, USA.
| | - Anna J Kochanowska-Karamyan
- Department of Pharmacognosy, The University of Mississippi, University, MS 38677, USA.
- Department of Pharmaceutical Sciences, School of Pharmacy, Texas Tech University HSC, Amarillo, TX 79106, USA.
| | - Howaida I Abd-Alla
- Department of Chemistry of Natural Compounds, National Research Center, Dokki 12622, Cairo, Egypt.
| | - Masami Otsuka
- Department of Bioorganic Medicinal Chemistry, Faculty of Life Sciences, Kumamoto University, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Mark T Hamann
- Department of Pharmacognosy, The University of Mississippi, University, MS 38677, USA.
- National Center for Natural Products Research, the University of Mississippi, University, MS 38677, USA.
- Department of Pharmacology, The University of Mississippi, University, MS 38677, USA.
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425, USA.
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Wang X, Fronczek FR, Chen J, Liu J, Ferreira D, Li S, Hamann MT. Assignment of Absolute Configuration of a New Hepatoprotective Schiartane-Type Nortriterpenoid Using X-Ray Diffraction. Molecules 2017; 22:molecules22010065. [PMID: 28045449 PMCID: PMC6155901 DOI: 10.3390/molecules22010065] [Citation(s) in RCA: 7] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 12/28/2016] [Accepted: 12/29/2016] [Indexed: 11/16/2022] Open
Abstract
A new schiartane-type nortriterpenoid, micrandilactone H was isolated from Kadsuralongipedunculata Finet et Gagnep. Its 2D (two dimension) structure was elucidated by NMR spectroscopic analysis, and it is similar to that of Kadnanolactones H and the absolute configuration was established through X-ray diffraction and ECD data analysis. This represents the first complete assignment of the absolute configuration of a schiartane-type nortriterpenoid by X-ray diffraction and the ECD method. Micrandilactone H showed moderate hepatoprotective activity against N-acetyl-p-aminophenol (APAP)-induced toxicity in HepG2 cells with cell survival rates of 56.84% at 10 μM.
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Affiliation(s)
- Xiaojuan Wang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, USA.
| | - Frank R Fronczek
- Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Jiabao Chen
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
| | - Jiabao Liu
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
| | - Daneel Ferreira
- Department of BioMolecular Sciences, Division of Pharmacognosy, and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, Mississippi 38677-1848, USA.
| | - Shuai Li
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
| | - Mark T Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, USA.
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Schrader KK, Hamann MT, McChesney JD, Rodenburg DL, Ibrahim MA. Antibacterial Activities of Metabolites from Platanus occidentalis (American sycamore) against Fish Pathogenic Bacteria. J Aquac Res Dev 2016; 6. [PMID: 27790379 PMCID: PMC5079432 DOI: 10.4172/2155-9546.1000364] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
One approach to the management of common fish diseases in aquaculture is the use of antibiotic-laden feed. However, there are public concerns about the use of antibiotics in agriculture and the potential development of antibiotic resistant bacteria. Therefore, the discovery of other environmentally safe natural compounds as alternatives to antibiotics would benefit the aquaculture industries. Four natural compounds, commonly called platanosides, [kaempferol 3-O-α-L-(2″,3″-di-E-p-coumaroyl)rhamnoside (1), kaempferol 3-O-α-L-(2″-E-p-coumaroyl-3″-Z-p-coumaroyl)rhamnoside (2), kaempferol 3-O-α-L-(2″-Z-p-coumaroyl-3″-E-p-coumaroyl)rhamnoside (3), and kaempferol 3-O-α-L-(2″,3″-di-Z-p-coumaroyl)rhamnoside (4)] isolated from the leaves of the American sycamore (Platanus occidentalis) tree were evaluated using a rapid bioassay for their antibacterial activities against common fish pathogenic bacteria including Flavobacterium columnare, Edwardsiella ictaluri, Aeromonas hydrophila, and Streptococcus iniae. The four isomers and a mixture of all four isomers were strongly antibacterial against isolates of F. columnare and S. iniae. Against F. columnare ALM-00-173, 3 and 4 showed the strongest antibacterial activities, with 24-h 50% inhibition concentration (IC50) values of 2.13 ± 0.11 and 2.62 ± 0.23 mg/L, respectively. Against S. iniae LA94-426, 4 had the strongest antibacterial activity, with 24-h IC50 of 1.87 ± 0.23 mg/L. Neither a mixture of the isomers nor any of the individual isomers were antibacterial against isolates of E. ictaluri and A. hydrophila at the test concentrations used in the study. Several of the isomers appear promising for the potential management of columnaris disease and streptococcosis in fish.
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Affiliation(s)
- Kevin K Schrader
- United States Department of Agriculture, Agricultural Research Service, Natural Products Utilization Research Unit, National Center for Natural Products Research, Post Office Box 1848, Mississippi 38677, USA
| | - Mark T Hamann
- Departments of Pharmacognosy, School of Pharmacy, University of Mississippi, University, Mississippi 38677, USA; Pharmacology, Chemistry and Biochemistry Department, School of Pharmacy, University of Mississippi, University, Mississippi 38677, USA
| | - James D McChesney
- Ironstone Separations, Inc., 147 County Road 245, Etta, Mississippi 38627, USA
| | - Douglas L Rodenburg
- Ironstone Separations, Inc., 147 County Road 245, Etta, Mississippi 38627, USA
| | - Mohamed A Ibrahim
- United States Department of Agriculture, Agricultural Research Service, Natural Products Utilization Research Unit, National Center for Natural Products Research, Post Office Box 1848, Mississippi 38677, USA; Departments of Pharmacognosy, School of Pharmacy, University of Mississippi, University, Mississippi 38677, USA; Department of Chemistry of Natural Compounds, National Research Center, Dokki 12622, Cairo, Egypt
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Cassilly CD, Maddox MM, Cherian PT, Bowling JJ, Hamann MT, Lee RE, Reynolds TB. SB-224289 Antagonizes the Antifungal Mechanism of the Marine Depsipeptide Papuamide A. PLoS One 2016; 11:e0154932. [PMID: 27183222 PMCID: PMC4868317 DOI: 10.1371/journal.pone.0154932] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [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: 02/25/2016] [Accepted: 04/21/2016] [Indexed: 12/20/2022] Open
Abstract
In order to expand the repertoire of antifungal compounds a novel, high-throughput phenotypic drug screen targeting fungal phosphatidylserine (PS) synthase (Cho1p) was developed based on antagonism of the toxin papuamide A (Pap-A). Pap-A is a cyclic depsipeptide that binds to PS in the membrane of wild-type Candida albicans, and permeabilizes its plasma membrane, ultimately causing cell death. Organisms with a homozygous deletion of the CHO1 gene (cho1ΔΔ) do not produce PS and are able to survive in the presence of Pap-A. Using this phenotype (i.e. resistance to Pap-A) as an indicator of Cho1p inhibition, we screened over 5,600 small molecules for Pap-A resistance and identified SB-224289 as a positive hit. SB-224289, previously reported as a selective human 5-HT1B receptor antagonist, also confers resistance to the similar toxin theopapuamide (TPap-A), but not to other cytotoxic depsipeptides tested. Structurally similar molecules and truncated variants of SB-224289 do not confer resistance to Pap-A, suggesting that the toxin-blocking ability of SB-224289 is very specific. Further biochemical characterization revealed that SB-224289 does not inhibit Cho1p, indicating that Pap-A resistance is conferred by another undetermined mechanism. Although the mode of resistance is unclear, interaction between SB-224289 and Pap-A or TPap-A suggests this screening assay could be adapted for discovering other compounds which could antagonize the effects of other environmentally- or medically-relevant depsipeptide toxins.
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Affiliation(s)
- Chelsi D. Cassilly
- Department of Microbiology, University of Tennessee, Knoxville, Tennessee, United States of America
| | - Marcus M. Maddox
- Department of Chemical Biology and Therapeutics, St. Jude Children’s Research Hospital, Memphis, Tennessee, 38105, United States of America
| | - Philip T. Cherian
- Department of Chemical Biology and Therapeutics, St. Jude Children’s Research Hospital, Memphis, Tennessee, 38105, United States of America
| | - John J. Bowling
- Department of Chemical Biology and Therapeutics, St. Jude Children’s Research Hospital, Memphis, Tennessee, 38105, United States of America
| | - Mark T. Hamann
- Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Medical University of South Carolina, Charleston, South Carolina, United States of America
| | - Richard E. Lee
- Department of Chemical Biology and Therapeutics, St. Jude Children’s Research Hospital, Memphis, Tennessee, 38105, United States of America
| | - Todd B. Reynolds
- Department of Microbiology, University of Tennessee, Knoxville, Tennessee, United States of America
- * E-mail:
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Waters AL, Oh J, Place AR, Hamann MT. Stereochemical Studies of the Karlotoxin Class Using NMR Spectroscopy and DP4 Chemical‐Shift Analysis: Insights into their Mechanism of Action. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507418] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Amanda L. Waters
- Department of Pharmacognosy, Pharmacology, School of Pharmacy, and Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677 (USA)
| | - Joonseok Oh
- Department of Pharmacognosy, Pharmacology, School of Pharmacy, and Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677 (USA)
| | - Allen R. Place
- Institute of Marine and Environmental Technology, University of Maryland Center for Environmental Sciences, Suite 236 Columbus Center, Baltimore, MD 21202 (USA)
| | - Mark T. Hamann
- Department of Pharmacognosy, Pharmacology, School of Pharmacy, and Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677 (USA)
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425 (USA)
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Waters AL, Oh J, Place AR, Hamann MT. Stereochemical Studies of the Karlotoxin Class Using NMR Spectroscopy and DP4 Chemical-Shift Analysis: Insights into their Mechanism of Action. Angew Chem Int Ed Engl 2015; 54:15705-10. [PMID: 26568046 DOI: 10.1002/anie.201507418] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [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: 08/09/2015] [Revised: 09/22/2015] [Indexed: 12/13/2022]
Abstract
After publication of karlotoxin 2 (KmTx2; 1), the harmful algal bloom dinoflagellate Karlodinium sp. was collected and scrutinized to identify additional biologically active complex polyketides. The structure of 1 was validated and revised at C49 using computational NMR tools including J-based configurational analysis and chemical-shift calculations. The characterization of two new compounds [KmTx8 (2) and KmTx9 (3)] was achieved through overlaid 2D HSQC NMR techniques, while the relative configurations were determined by comparison to 1 and computational chemical-shift calculations. The detailed evaluation of 2 using the NCI-60 cell lines, NMR binding studies, and an assessment of the literature supports a mode of action (MoA) for targeting cancer-cell membranes, especially of cytostatic tumors. This MoA is uniquely different from that of current agents employed in the control of cancers for which 2 shows sensitivity.
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Affiliation(s)
- Amanda L Waters
- Department of Pharmacognosy, Pharmacology, School of Pharmacy, and Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677 (USA)
| | - Joonseok Oh
- Department of Pharmacognosy, Pharmacology, School of Pharmacy, and Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677 (USA)
| | - Allen R Place
- Institute of Marine and Environmental Technology, University of Maryland Center for Environmental Sciences, Suite 236 Columbus Center, Baltimore, MD 21202 (USA)
| | - Mark T Hamann
- Department of Pharmacognosy, Pharmacology, School of Pharmacy, and Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677 (USA). , .,Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425 (USA). ,
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Affiliation(s)
- Vedanjali Gogineni
- Department of Pharmacognosy, Pharmacology, Chemistry & Biochemistry, University of Mississippi, School of Pharmacy, University, Mississippi 38677, United States
| | - Raymond F. Schinazi
- Center for AIDS Research, Department of Pediatrics, Emory University/Veterans Affairs Medical Center, 1760 Haygood Drive NE, Atlanta, Georgia 30322, United States
| | - Mark T. Hamann
- Department of Pharmacognosy, Pharmacology, Chemistry & Biochemistry, University of Mississippi, School of Pharmacy, University, Mississippi 38677, United States
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Zhang Y, Valeriote F, Swartz K, Chen B, Hamann MT, Rodenburg DL, McChesney JD, Shaw J. HPLC Plasma Assay of a Novel Anti-MRSA Compound, Kaempferol-3- O-Alpha-L-(2″,3″-di- p-coumaroyl)rhamnoside, from Sycamore Leaves. Nat Prod Commun 2015. [DOI: 10.1177/1934578x1501000818] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is a serious pathogen that is resistant to current antibiotic therapy. Thus, there is an urgent need for novel antimicrobial agents that can effectively combat these new strains of drug-resistant “superbugs”. Recently, fractionation of an extract from Platanus occidentalis (American sycamore) leaves produced an active kaempferol molecule, 3- O-alpha-L-(2″,3″-di- p-coumaroyl)rhamnoside (KCR), in four isomeric forms; all four isomers exhibit potent anti-MRSA activity. In order to further the preclinical development of KCR as a new antibiotic class, we developed and validated a simple analytical method for assaying KCR plasma concentration. Because KCR will be developed as a new drug, although comprising four stereoisomers, the analytical method was devised to assay the total amount of all four isomers. In the present work, both a plasma processing procedure and an HPLC method have been developed and validated. Mouse plasma containing KCR was first treated with ethanol and then centrifuged. The supernatant was dried, suspended in ethanol, centrifuged, and the supernatant was injected into an HPLC system comprising a Waters C18, a mobile phase composing methanol, acetonitrile, and trifluoroacetic acid and monitored at 313 nm. The method was validated by parameters including a good linear correlation, a limit of quantification of 0.27 μg/mL, and high accuracy. In summary, this method allows a rapid analysis of KCR in the plasma samples for pharmacokinetics studies.
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Affiliation(s)
- Yiguan Zhang
- Henry Ford Health System, 440 Burroughs St, Detroit, MI 48202, USA
| | | | - Kenneth Swartz
- Henry Ford Health System, 440 Burroughs St, Detroit, MI 48202, USA
| | - Ben Chen
- 21st Century Therapeutics, 1366 Hilton Rd, Ferndale, MI 48220, USA
| | - Mark T. Hamann
- Oxford Pharmaceutical Development, Oxford, MS 38655, USA
| | | | | | - Jiajiu Shaw
- Henry Ford Health System, 440 Burroughs St, Detroit, MI 48202, USA
- 21st Century Therapeutics, 1366 Hilton Rd, Ferndale, MI 48220, USA
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Zhang Y, Valeriote F, Swartz K, Chen B, Hamann MT, Rodenburg DL, McChesney JD, Shaw J. HPLC Plasma Assay of a Novel Anti-MRSA Compound, Kaempferol-3-O-Alpha-L-(2",3"-di-p-coumaroyl)rhamnoside, from Sycamore Leaves. Nat Prod Commun 2015; 10:1383-1386. [PMID: 26434123 PMCID: PMC4895204] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is a serious pathogen that is resistant to current antibiotic therapy. Thus, there is an urgent need for novel antimicrobial agents that can effectively combat these new strains of drug-resistant "superbugs". Recently, fractionation of an extract from Platanus occidentalis (American sycamore) leaves produced an active kaempferol molecule, 3-O-alpha-L-(2",3"-di-p-coumaroyl)rhamnoside (KCR), in four isomeric forms; all four isomers exhibit potent anti-MRSA activity. In order to further the preclinical development of KCR as a new antibiotic class, we developed and validated a simple analytical method for assaying KCR plasma concentration. Because KCR will be developed as a new drug, although comprising four stereoisomers, the analytical method was devised to assay the total amount of all four isomers. In the present work, both a plasma processing procedure and an HPLC method have been developed and validated. Mouse plasma containing KCR was first treated with ethanol and then centrifuged. The supernatant was dried, suspended in ethanol, centrifuged, and the supernatant was injected into an HPLC system comprising a Waters C18, a mobile phase composing methanol, acetonitrile, and trifluoroacetic acid and monitored at 313 nm. The method was validated by parameters including a good linear correlation, a limit of quantification of 0.27 microg/mL, and high accuracy. In summary, this method allows a rapid analysis of KCR in the plasma samples for pharmacokinetics studies.
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Affiliation(s)
- Yiguan Zhang
- Henry Ford Health System, 440 Burroughs St, Detroit, MI 48202, USA
| | | | - Kenneth Swartz
- Henry Ford Health System, 440 Burroughs St, Detroit, MI 48202, USA
| | - Ben Chen
- 21st Century Therapeutics, 1366 Hilton Rd, Ferndale, MI 48220, USA
| | - Mark T. Hamann
- Oxford Pharmaceutical Development, Oxford, MS 38655, USA
| | | | | | - Jiajiu Shaw
- Henry Ford Health System, 440 Burroughs St, Detroit, MI 48202, USA
- 21st Century Therapeutics, 1366 Hilton Rd, Ferndale, MI 48220, USA
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Chatwichien J, Basu S, Murphy ME, Hamann MT, Winkler JD. Design, Synthesis and Biological Evaluation of β-Carboline Dimers Based on the Structure of Neokauluamine. Tetrahedron Lett 2015; 56:3515-3517. [PMID: 26257442 DOI: 10.1016/j.tetlet.2015.01.142] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The design, synthesis and biological evaluation (anticancer and antimalarial activity) of bis-β-carbolines, based on the structure of the naturally occurring alkaloid neokauluamine, is described.
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Affiliation(s)
| | | | | | - Mark T Hamann
- Department of BioMolecular Sciences, University of Mississippi, University, MS 38677
| | - Jeffrey D Winkler
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104
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Wang B, Waters AL, Valeriote FA, Hamann MT. An efficient and cost-effective approach to kahalalide F N-terminal modifications using a nuisance algal bloom of Bryopsis pennata. Biochim Biophys Acta Gen Subj 2015; 1850:1849-54. [PMID: 25964068 DOI: 10.1016/j.bbagen.2015.05.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [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: 01/25/2015] [Revised: 04/27/2015] [Accepted: 05/04/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND Kahalalide F (KF) and its isomer iso-kahalalide F (isoKF), both of which can be isolated from the mollusk Elysia rufescens and its diet alga Bryopsis pennata, are potent cytotoxic agents that have advanced through five clinical trials. Due to a short half-life, narrow spectrum of activity, and a modest response in patients, further efforts to modify the molecule are required to address its limitations. In addition, due to the high cost in producing KF analogues using solid phase peptide synthesis (SPPS), a degradation and reconstruction approach was employed using natural KF from a seasonal algal bloom to generate KF analogues. METHODS N-protected KF was carefully hydrolyzed at the amide linkage between l-Thr12 and d-Val13 using dilute HCl. The synthesis of the C-terminal fragment began with the formation of hexanoic succinimide ester, followed by a reaction with dipeptides. The final coupling reaction was performed between the semisynthesized Fmoc-KF hydrolysis product and the C-terminal fragment, followed by the deprotection of the Fmoc group. RESULTS Six KF analogues with an addition of an amino acid residue on the N-terminal chain, d-Val14-isoKF (2), Val13-Val14-isoKF (3), d-Leu14-isoKF (4), d-Pro14-isoKF (5), d-Phe14-isoKF (6), and 3,4-2F-d-Phe14-isoKF (7) were prepared using semisynthesis at the exposed N-terminal chain. CONCLUSIONS The overall yield of the medication was 45%. This approach is economical, efficient and amendable to large-scale production while eliminated a nuisance algal bloom. GENERAL SIGNIFICANCE B. pennata blooms are capable of producing KF in good yields. The semisynthesis from the natural product produced N-terminal modifications for the construction of inexpensive semisynthetic KF libraries.
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Affiliation(s)
- Bin Wang
- Division of Pharmacognosy, Department of BioMolecular Sciences, The University of Mississippi, University, MS 38677, USA
| | - Amanda L Waters
- Division of Pharmacognosy, Department of BioMolecular Sciences, The University of Mississippi, University, MS 38677, USA
| | - Frederick A Valeriote
- Henry Ford Health System, Department of Internal Medicine, Division of Hematology and Oncology, Detroit, MI 48202, USA
| | - Mark T Hamann
- Division of Pharmacognosy, Department of BioMolecular Sciences, The University of Mississippi, University, MS 38677, USA; Division of Pharmacology, Department of BioMolecular Sciences, The University of Mississippi, University, MS 38677, USA; Department of Chemistry and Biochemistry and National Center for Natural Products Research, The University of Mississippi, University, MS 38677, USA.
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Abstract
Bioassay-guided fractionation of the extract of Jamaican marine sponge Plakortis sp. followed by preparative TLC and HPLC yielded several known methyl ester cyclic peroxides (1a, 2a, 3a, 4, 5), known plakortides (6,7), known bicyclic lactone (8) and new cyclic peroxide acids (1b, 2b, 3b). The chemical structures were elucidated by extensive interpretation of their spectroscopic data. These natural products showed remarkable in vitro cytotoxicity against several cancer cell lines.
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Affiliation(s)
- Thomas R. Hoye
- Chemistry Department, Univeristy of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Walied M. Alarif
- Marine Chemistry Department, Faculty of Marine Sciences, King Abdulaziz University, P. O. Box 80207, Jeddah 21589, Saudi Arabia
| | - Salim S. Basaif
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
| | - Mohamed Abo-Elkarm
- Medicinal Chemistry, Univeristy of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Mark T. Hamann
- Department of Pharmacognosy, School of Pharmacy Mississippi Univeristy, Mississippi 38677, USA
| | - Amir E. Wahba
- Department of Pharmacognosy, School of Pharmacy Mississippi Univeristy, Mississippi 38677, USA
| | - Seif-Eldin N. Ayyad
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
- Department of Chemistry, Faculty of Science, Damietta University, Damietta, Egypt
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Hwang IH, Oh J, Zhou W, Park S, Kim JH, Chittiboyina AG, Ferreira D, Song GY, Oh S, Na M, Hamann MT. Cytotoxic activity of rearranged drimane meroterpenoids against colon cancer cells via down-regulation of β-catenin expression. J Nat Prod 2015; 78:453-61. [PMID: 25590830 PMCID: PMC4380199 DOI: 10.1021/np500843m] [Citation(s) in RCA: 34] [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] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Colorectal cancer has emerged as a major cause of death in Western countries. Down-regulation of β-catenin expression has been considered a promising approach for cytotoxic drug formulation. Eight 4,9-friedodrimane-type sesquiterpenoids (1-8) were acquired using the oxidative potential of Verongula rigida on bioactive metabolites from two Smenospongia sponges. Compounds 3 and 4 contain a 2,2-dimethylbenzo[d]oxazol-6(2H)-one moiety as their substituted heterocyclic residues, which is unprecedented in such types of meroterpenoids. Gauge-invariant atomic orbital NMR chemical shift calculations were employed to investigate stereochemical details with support of the application of advanced statistics such as CP3 and DP4. Compounds 2 and 8 and the mixture of 3 and 4 suppressed β-catenin response transcription (CRT) via degrading β-catenin and exhibited cytotoxic activity on colon cancer cells, implying that their anti-CRT potential is, at least in part, one of their underlying antineoplastic mechanisms.
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Affiliation(s)
- In Hyun Hwang
- Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Joonseok Oh
- Division of Pharmacognosy, Department of BioMolecular
Sciences, and
Research Institute of Pharmaceutical Sciences, School of Pharmacy, and National Center
for Natural Products Research, The University
of Mississippi, University, Mississippi 38677, United States
| | - Wei Zhou
- College
of Pharmacy, Chungnam National University, Yuseong-gu, Daejeon 305-764, Republic of Korea
| | - Seoyoung Park
- Department
of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 136-702, Republic of Korea
| | - Joo-Hyun Kim
- Department
of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 136-702, Republic of Korea
| | - Amar G. Chittiboyina
- Division of Pharmacognosy, Department of BioMolecular
Sciences, and
Research Institute of Pharmaceutical Sciences, School of Pharmacy, and National Center
for Natural Products Research, The University
of Mississippi, University, Mississippi 38677, United States
| | - Daneel Ferreira
- Division of Pharmacognosy, Department of BioMolecular
Sciences, and
Research Institute of Pharmaceutical Sciences, School of Pharmacy, and National Center
for Natural Products Research, The University
of Mississippi, University, Mississippi 38677, United States
| | - Gyu Yong Song
- College
of Pharmacy, Chungnam National University, Yuseong-gu, Daejeon 305-764, Republic of Korea
| | - Sangtaek Oh
- Department
of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 136-702, Republic of Korea
- Tel: +82 2 910 5732. Fax: +82-2-910-5739. E-mail: (S. Oh)
| | - MinKyun Na
- College
of Pharmacy, Chungnam National University, Yuseong-gu, Daejeon 305-764, Republic of Korea
- Tel: +82 42 821 5925. Fax: +82 42 823 6566. E-mail: (M.
Na)
| | - Mark T. Hamann
- Division of Pharmacognosy, Department of BioMolecular
Sciences, and
Research Institute of Pharmaceutical Sciences, School of Pharmacy, and National Center
for Natural Products Research, The University
of Mississippi, University, Mississippi 38677, United States
- Tel: +1 662
915 5730. Fax: +1 662 915 6975. E-mail: (M. T. Hamann)
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Waters AL, Peraud O, Kasanah N, Sims JW, Kothalawala N, Anderson MA, Abbas SH, Rao KV, Jupally VR, Kelly M, Dass A, Hill RT, Hamann MT. An analysis of the sponge Acanthostrongylophora igens' microbiome yields an actinomycete that produces the natural product manzamine A. Front Mar Sci 2014; 1:54. [PMID: 27785452 PMCID: PMC5076551 DOI: 10.3389/fmars.2014.00054] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Sponges have generated significant interest as a source of bioactive and elaborate secondary metabolites that hold promise for the development of novel therapeutics for the control of an array of human diseases. However, research and development of marine natural products can often be hampered by the difficulty associated with obtaining a stable and sustainable production source. Herein we report the first successful characterization and utilization of the microbiome of a marine invertebrate to identify a sustainable production source for an important natural product scaffold. Through molecular-microbial community analysis, optimization of fermentation conditions and MALDI-MS imaging, we provide the first report of a sponge-associated bacterium (Micromonospora sp.) that produces the manzamine class of antimalarials from the Indo-Pacific sponge Acanthostrongylophora ingens (Thiele, 1899) (Class Demospongiae, Order Haplosclerida, Family Petrosiidae). These findings suggest that a general strategy of analysis of the macroorganism's microbiome could significantly transform the field of natural products drug discovery by gaining access to not only novel drug leads, but the potential for sustainable production sources and biosynthetic genes at the same time.
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Affiliation(s)
- Amanda L. Waters
- Division of Pharmacognosy, Department of BioMolecular Sciences, School of Pharmacy, University of Mississippi, University, MS, USA
| | - Olivier Peraud
- Institute of Marine and Environmental Technology, University of Maryland Center for Environmental Sciences, Baltimore, MD, USA
| | - Noer Kasanah
- Division of Pharmacognosy, Department of BioMolecular Sciences, School of Pharmacy, University of Mississippi, University, MS, USA
- Faculty of Pharmacy, Gadjah Mada University, Yogyakarta, Indonesia
| | - James W. Sims
- Division of Pharmacognosy, Department of BioMolecular Sciences, School of Pharmacy, University of Mississippi, University, MS, USA
| | - Nuwan Kothalawala
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS, USA
| | - Matthew A. Anderson
- Institute of Marine and Environmental Technology, University of Maryland Center for Environmental Sciences, Baltimore, MD, USA
| | - Samuel H. Abbas
- Division of Pharmacognosy, Department of BioMolecular Sciences, School of Pharmacy, University of Mississippi, University, MS, USA
| | - Karumanchi V. Rao
- Division of Pharmacognosy, Department of BioMolecular Sciences, School of Pharmacy, University of Mississippi, University, MS, USA
| | - Vijay R. Jupally
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS, USA
| | - Michelle Kelly
- National Center for Coasts and Oceans, National Institute of Water and Atmospheric Research, Auckland, New Zealand
| | - Amala Dass
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS, USA
| | - Russell T. Hill
- Institute of Marine and Environmental Technology, University of Maryland Center for Environmental Sciences, Baltimore, MD, USA
- Correspondence: Russell T. Hill, Institute of Marine and Environmental Technology, University of Maryland Center for Environmental Sciences, 701 East Pratt Street, Baltimore, MD 21202, USA, ; Mark T. Hamann, Division of Pharmacognosy/Pharmacology, University of Mississippi Medical Center, Cancer Center, School of Pharmacy, University of Mississippi, 407 Faser Hall, University, MS 38677, USA,
| | - Mark T. Hamann
- Division of Pharmacognosy, Department of BioMolecular Sciences, School of Pharmacy, University of Mississippi, University, MS, USA
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS, USA
- Division of Pharmacology, Department of BioMolecular Sciences, School of Pharmacy, University of Mississippi, University, MS, USA
- National Center for Natural Product Research, University of Mississippi, University, MS, USA
- Correspondence: Russell T. Hill, Institute of Marine and Environmental Technology, University of Maryland Center for Environmental Sciences, 701 East Pratt Street, Baltimore, MD 21202, USA, ; Mark T. Hamann, Division of Pharmacognosy/Pharmacology, University of Mississippi Medical Center, Cancer Center, School of Pharmacy, University of Mississippi, 407 Faser Hall, University, MS 38677, USA,
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