1
|
Muir G, Paterson I, Lam NYS, Britton R. Synthesis of the Phormidolide A Macrocycle Supports the Proposed Configurational Reassignment. Org Lett 2024; 26:8548-8553. [PMID: 39332025 DOI: 10.1021/acs.orglett.4c03171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/29/2024]
Abstract
We describe the successful synthesis of the phormidolide A macrocycle as a crucial step toward its total synthesis and configurational assignment. Exhaustive exploration of macrocyclization strategies revealed the detrimental effects of a bulky protecting group on the C17 hydroxyl function, leading to the successful use of a C17 p-methoxybenzyloxymethyl (PMBM) ether in the macrolactonization reaction. Further elaboration of the macrocycle with a truncated C18-C23 side chain afforded an advanced C1-C23 fragment of phormidolide A. Detailed comparison of spectroscopic data with those of phormidolide A supports the proposed configurational reassignment.
Collapse
Affiliation(s)
- Garrett Muir
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Ian Paterson
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Nelson Y S Lam
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
- Department of Chemistry, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada
| | - Robert Britton
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| |
Collapse
|
2
|
Chan E, Dirk BS, Honda T, Stathopulos PB, Dikeakos JD, Di Guglielmo GM. Acetylenic tricyclic bis-(cyano enone) interacts with Cys 374 of actin, a residue necessary for stress fiber formation and cell migration. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2024; 1871:119629. [PMID: 37981034 DOI: 10.1016/j.bbamcr.2023.119629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 10/31/2023] [Accepted: 11/07/2023] [Indexed: 11/21/2023]
Abstract
The migratory and invasive potential of tumour cells relies on the actin cytoskeleton. We previously demonstrated that the tricyclic compound, TBE-31, inhibits actin polymerization and here we further examine the precise interaction between TBE-31 and actin. We demonstrate that iodoacetamide, a cysteine (Cys) alkylating agent, interferes with the ability of TBE-31 to interact with actin. In addition, in silico analysis identified Cys 217, Cys 272, Cys 285 and Cys 374 as potential binding sites for TBE-31. Using mass spectrometry analysis, we determined that TBE-31 associates with actin with a stoichiometric ratio of 1:1. We mutated the identified cysteines of actin to alanine and performed a pull-down analysis with a biotin labeled TBE-31 and demonstrated that by mutating Cys 374 to alanine the association between TBE-31 and actin was significantly reduced, suggesting that TBE-31 binds to Cys 374. A characterization of the NIH3T3 cells overexpressing eGFP-actin-C374A showed reduced stress fiber formation, suggesting Cys 374 is necessary for efficient incorporation into filamentous actin. Furthermore, migration of eGFP-Actin-WT expressing cells were observed to be inhibited by TBE-31, however fewer eGFP-Actin-C374A expressing cells were observed to migrate compared to the cells expressing eGFP-Actin-WT in the presence or absence of TBE-31. Taken together, our results suggest that TBE-31 binds to Cys 374 of actin to inhibit actin stress fiber formation and may potentially be a mechanism through which TBE-31 inhibits cell migration.
Collapse
Affiliation(s)
- Eddie Chan
- Western University, Department of Physiology and Pharmacology, London N6A5C1, Canada
| | - Brennan S Dirk
- Western University, Department of Microbiology and Immunology, London N6A5C1, Canada
| | - Tadashi Honda
- Stony Brook University, Department of Chemistry, Institute of Chemical Biology & Drug Discovery, Stony Brook 11790-3400, USA
| | - Peter B Stathopulos
- Western University, Department of Physiology and Pharmacology, London N6A5C1, Canada
| | - Jimmy D Dikeakos
- Western University, Department of Microbiology and Immunology, London N6A5C1, Canada
| | - Gianni M Di Guglielmo
- Western University, Department of Physiology and Pharmacology, London N6A5C1, Canada.
| |
Collapse
|
3
|
Moreno R, Casares L, Higgins M, Ali KX, Honda T, Wiel C, Sayin VI, Dinkova-Kostova AT, de la Vega L. Biotinylation of an acetylenic tricyclic bis(cyanoenone) lowers its potency as an NRF2 activator while creating a novel activity against BACH1. Free Radic Biol Med 2022; 191:203-211. [PMID: 36084789 DOI: 10.1016/j.freeradbiomed.2022.08.041] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 08/18/2022] [Accepted: 08/31/2022] [Indexed: 11/30/2022]
Abstract
The transcription factor BACH1 regulates the expression of a variety of genes including genes involved in oxidative stress responses, inflammation, cell motility, cancer cell invasion and cancer metabolism. Based on this, BACH1 has become a promising therapeutic target in cancer (as anti-metastatic target) and also in chronic conditions linked to oxidative stress and inflammation, where BACH1 inhibitors share a therapeutic space with activators of transcription factor NRF2. However, while there is a growing number of NRF2 activators, there are only a few described BACH1 inhibitors/degraders. The synthetic acetylenic tricyclic bis(cyanoenone),(±)-(4bS,8aR,10aS)-10a-ethynyl-4b,8,8-trimethyl-3,7-dioxo-3.4b,7,8,8a,9,10, 10a-octahydrophenanthrene-2,6-dicarbonitrile, TBE31 is a potent activator of NRF2 without any BACH1 activity. Herein we found that biotinylation of TBE31 greatly reduces its potency as NRF2 activator (50-75-fold less active) while acquiring a novel activity as a BACH1 degrader (100-200-fold more active). We demonstrate that TBE56, the biotinylated TBE31, interacts and promotes the degradation of BACH1 via a mechanism involving the E3 ligase FBXO22. TBE56 is a potent and sustained BACH1 degrader (50-fold more potent than hemin) and accordingly a powerful HMOX1 inducer. TBE56 degrades BACH1 in lung and breast cancer cells, impairing breast cancer cell migration and invasion in a BACH1-dependent manner, while TBE31 has no significant effect. Altogether, our study identifies that the biotinylation of TBE31 provides novel activities with potential therapeutic value, providing a rationale for further characterisation of this and related compounds.
Collapse
Affiliation(s)
- Rita Moreno
- Jacqui Wood Cancer Centre, Division of Cellular Medicine, School of Medicine, University of Dundee, UK
| | - Laura Casares
- Jacqui Wood Cancer Centre, Division of Cellular Medicine, School of Medicine, University of Dundee, UK
| | - Maureen Higgins
- Jacqui Wood Cancer Centre, Division of Cellular Medicine, School of Medicine, University of Dundee, UK
| | - Kevin X Ali
- Institute of Clinical Sciences, Department of Surgery, Sahlgrenska Center for Cancer Research, University of Gothenburg, Gothenburg, Sweden; Wallenberg Centre for Molecular and Translational Medicine, University of Gothenburg, Gothenburg, Sweden
| | - Tadashi Honda
- Department of Chemistry and Institute of Chemical Biology & Drug Discovery, Stony Brook University, Stony Brook, NY, 11794-3400, USA
| | - Clotilde Wiel
- Institute of Clinical Sciences, Department of Surgery, Sahlgrenska Center for Cancer Research, University of Gothenburg, Gothenburg, Sweden; Wallenberg Centre for Molecular and Translational Medicine, University of Gothenburg, Gothenburg, Sweden
| | - Volkan I Sayin
- Institute of Clinical Sciences, Department of Surgery, Sahlgrenska Center for Cancer Research, University of Gothenburg, Gothenburg, Sweden; Wallenberg Centre for Molecular and Translational Medicine, University of Gothenburg, Gothenburg, Sweden
| | - Albena T Dinkova-Kostova
- Jacqui Wood Cancer Centre, Division of Cellular Medicine, School of Medicine, University of Dundee, UK; Department of Medicine and Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Laureano de la Vega
- Jacqui Wood Cancer Centre, Division of Cellular Medicine, School of Medicine, University of Dundee, UK.
| |
Collapse
|
4
|
Liu ZY, Zhang HY, Bi Y, Liu XX, Lu J, Zhang XC, Xu JY, Wang CZ, Yuan CS. Design and synthesis of 28-hydroxy protopanaxadiol as a novel probe template. Nat Prod Res 2017; 31:1523-1528. [PMID: 28107791 DOI: 10.1080/14786419.2017.1280488] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
To explore the antitumour mechanism of 20(S)-protopanaxadiol (PPD) while maintaining its uncovered pharmacological active site 3-hydroxyl, 28-hydroxy protopanaxadiol (17), a small molecular probe template of PPD was first designed and synthesised based on the Baldwin's reaction. Thus, 28-hydroxyl of 17 was built successfully as a derivatized site of molecular probe's functional and report groups. The important intermediates and final product were confirmed by ESI-MS and nuclear magnetic resonance spectra with good yield. These studies provided a valuable basis for probe research of PPD.
Collapse
Affiliation(s)
- Ze-Yun Liu
- a School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong , Yantai University , Yantai , China
| | - Heng-Yuan Zhang
- b State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing , China
| | - Yi Bi
- a School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong , Yantai University , Yantai , China
| | - Xian-Xuan Liu
- a School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong , Yantai University , Yantai , China
| | - Jing Lu
- a School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong , Yantai University , Yantai , China
| | - Xiao-Chen Zhang
- a School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong , Yantai University , Yantai , China
| | - Jin-Yi Xu
- b State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing , China
| | - Chong-Zhi Wang
- c Tang Center for Herbal Medicine Research , University of Chicago , Chicago , IL , USA.,d Department of Anesthesia and Critical Care , University of Chicago , Chicago , IL , USA
| | - Chun-Su Yuan
- c Tang Center for Herbal Medicine Research , University of Chicago , Chicago , IL , USA.,d Department of Anesthesia and Critical Care , University of Chicago , Chicago , IL , USA
| |
Collapse
|
5
|
Chan E, Saito A, Honda T, Di Guglielmo GM. The acetylenic tricyclic bis(cyano enone), TBE-31 inhibits non-small cell lung cancer cell migration through direct binding with actin. Cancer Prev Res (Phila) 2014; 7:727-37. [PMID: 24806663 DOI: 10.1158/1940-6207.capr-13-0403] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The migratory and invasive potential of the epithelial-derived tumor cells depends on epithelial-to-mesenchymal transition (EMT) as well as the reorganization of the cell cytoskeleton. Here, we show that the tricyclic compound acetylenic tricyclic bis(cyano enone), TBE-31, directly binds to actin and inhibits linear and branched actin polymerization in vitro. Furthermore, we observed that TBE-31 inhibits stress fiber formation in fibroblasts as well as in non-small cell lung cancer cells during TGFβ-dependent EMT. Interestingly, TBE-31 does not interfere with TGFβ-dependent signaling or changes in E-cadherin and N-cadherin protein levels during EMT. Finally, we observed that TBE-31 inhibits fibroblast and non-small cell lung tumor cell migration with an IC50 of 1.0 and 2.5 μmol/L, respectively. Taken together, our results suggest that TBE-31 targets linear actin polymerization to alter cell morphology and inhibit cell migration.
Collapse
Affiliation(s)
- Eddie Chan
- Authors' Affiliations: Department of Physiology and Pharmacology, University of Western Ontario, London, Ontario, Canada
| | - Akira Saito
- Institute of Chemical Biology and Drug Discovery; and
| | - Tadashi Honda
- Institute of Chemical Biology and Drug Discovery; and Department of Chemistry, Stony Brook University, Stony Brook, New York
| | - Gianni M Di Guglielmo
- Authors' Affiliations: Department of Physiology and Pharmacology, University of Western Ontario, London, Ontario, Canada;
| |
Collapse
|