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Otsuka H, Nakai K, Shimizu E, Yamaguchi T, Yamano M, Sasaki H, Koyama K, Kinoshita K. Photoreaction products of extract from the fruiting bodies of Polyozellus multiplex. J Nat Med 2024; 78:547-557. [PMID: 38509426 DOI: 10.1007/s11418-024-01790-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Accepted: 02/12/2024] [Indexed: 03/22/2024]
Abstract
Photochemical reactions are powerful tools for synthesizing organic molecules. The input of energy provided by light offers a means to produce strained and unique molecules that cannot be assembled using thermal protocols, allowing for the production of immense molecular complexity in a single chemical step. Furthermore, unlike thermal reactions, photochemical reactions do not require active reagents such as acids, bases, metals, or enzymes. Photochemical reactions play a central role in green chemistry. This article reports the isolation and structure determination of four new compounds (1-4) from the photoreaction products of the Polyozellus multiplex MeOH ext. The structures of the new compounds were elucidated using MS, IR, comprehensive NMR measurements and microED. The four compounds were formed by deacetylation of polyozellin, the main secondary metabolite of P. multiplex, and addition of singlet oxygen generated by sunlight. To develop drugs for treating Alzheimer's disease (AD) on the basis of the amyloid cascade hypothesis, the compounds (1-4) obtained by photoreaction were evaluated for BACE1 inhibitory activity. The hydrolysates (5 and 6) of polyozellin, the main secondary metabolites of P. multiplex, were also evaluated. The photoreaction products (3 and 4) and hydrolysates (5 and 6) of polyozellin showed BACE1 inhibitory activity (IC50: 2.2, 16.4, 23.3, and 5.3 μM, respectively).
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Affiliation(s)
- Hayato Otsuka
- Department of Pharmacognosy and Phytochemistry, Meiji Pharmaceutical University, Noshio 2-522-1, Kiyose-Shi, Tokyo, 204-8588, Japan
| | - Keiyo Nakai
- Department of Chemistry, Chemical R&D Laboratory, SPERA PHARMA, Inc, 17-85, Jusohonmachi 2-Chome, Yodogawa-Ku, Osaka, 532-0024, Japan
| | - Emi Shimizu
- Department of Pharmacognosy and Phytochemistry, Meiji Pharmaceutical University, Noshio 2-522-1, Kiyose-Shi, Tokyo, 204-8588, Japan
| | - Takamasa Yamaguchi
- Department of Pharmacognosy and Phytochemistry, Meiji Pharmaceutical University, Noshio 2-522-1, Kiyose-Shi, Tokyo, 204-8588, Japan
| | - Mitsuhisa Yamano
- Department of Chemistry, Chemical R&D Laboratory, SPERA PHARMA, Inc, 17-85, Jusohonmachi 2-Chome, Yodogawa-Ku, Osaka, 532-0024, Japan
| | - Hiroaki Sasaki
- Department of Pharmacognosy and Phytochemistry, Meiji Pharmaceutical University, Noshio 2-522-1, Kiyose-Shi, Tokyo, 204-8588, Japan
| | - Kiyotaka Koyama
- Department of Pharmacognosy and Phytochemistry, Meiji Pharmaceutical University, Noshio 2-522-1, Kiyose-Shi, Tokyo, 204-8588, Japan
| | - Kaoru Kinoshita
- Department of Pharmacognosy and Phytochemistry, Meiji Pharmaceutical University, Noshio 2-522-1, Kiyose-Shi, Tokyo, 204-8588, Japan.
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Tan YS, Wong SK, Yong KT, Lim KH, Lim SH, Low YY. Eugeniifoline, a Pentacyclic Indole Alkaloid from Leuconotis eugeniifolia, and Configurational Revision of Synthetic Eugeniifoline Isolated from a Diversity-Enhanced Extract. JOURNAL OF NATURAL PRODUCTS 2023; 86:232-236. [PMID: 36651825 DOI: 10.1021/acs.jnatprod.2c00731] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Eugeniifoline (1), a pentacyclic indole alkaloid with a five-membered ring E, was isolated for the first time as a natural product from the stem-bark extract of Leuconotis eugeniifolia. Eugeniifoline (1) was previously reported as a synthetic product from a diversity-enhanced extract, but with the configuration at C-21 reported as S (1a). The configuration at C-21 was revised to R as shown in 1, based on the NOE data, GIAO NMR calculations, and DP4+ probability analysis, as well as the TDDFT-ECD method.
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Affiliation(s)
- Yi-Sheng Tan
- Department of Chemistry, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
| | - Soon-Kit Wong
- Department of Chemistry, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
| | - Kien-Thai Yong
- Institute of Biological Sciences, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
| | - Kuan-Hon Lim
- School of Pharmacy, University of Nottingham Malaysia, Jalan Broga, 43500 Semenyih, Selangor, Malaysia
| | - Siew-Huah Lim
- Department of Chemistry, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
| | - Yun-Yee Low
- Department of Chemistry, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
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3
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Suzuki Y, Ichinohe K, Sugawara A, Kida S, Murase S, Zhang J, Yamada O, Hattori T, Oshima Y, Kikuchi H. Development of Indole Alkaloid-Type Dual Immune Checkpoint Inhibitors Against CTLA-4 and PD-L1 Based on Diversity-Enhanced Extracts. Front Chem 2021; 9:766107. [PMID: 34858943 PMCID: PMC8630621 DOI: 10.3389/fchem.2021.766107] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Accepted: 10/04/2021] [Indexed: 11/13/2022] Open
Abstract
Cancer immunotherapy involves the use of the immune system for cancer treatment. Recently, immune checkpoint-blocking antibodies have become integral for the treatment of some cancers. However, small molecules exhibit advantages over monoclonal antibody drugs, such as cell penetration, long half-life, and low manufacturing costs, and the possibility of oral administration. Thus, it is imperative to develop small-molecule immune checkpoint inhibitors. Previously, we have screened a library of synthetic indole-alkaloid-type compounds, which are produced by diversity-enhanced extracts of Japanese cornelian cherry, and reported that an unnatural pentacyclic compound inhibits CTLA-4 gene expression. In this study, immune checkpoint inhibitors with increased potency were developed by introducing substituents and conversion of functional groups based on the unnatural pentacyclic compound. The developed compounds suppressed not only CTLA-4 and PD-L1 gene expression but also protein expression on the cell surface. Their efficacy was not as potent as that of the existing small-molecule immune checkpoint inhibitors, but, to the best of our knowledge, the developed compounds are the first reported dual small-molecule inhibitors of CTLA-4 and PD-L1.
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Affiliation(s)
- Yoshihide Suzuki
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Keisuke Ichinohe
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Akihiro Sugawara
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Shinya Kida
- Research and Development Center, FUSO Pharmaceutical Industries, Ltd., Osaka, Japan
| | - Shinya Murase
- Research and Development Center, FUSO Pharmaceutical Industries, Ltd., Osaka, Japan
| | - Jing Zhang
- Research and Development Center, FUSO Pharmaceutical Industries, Ltd., Osaka, Japan
| | - Osamu Yamada
- Research and Development Center, FUSO Pharmaceutical Industries, Ltd., Osaka, Japan
| | - Toshio Hattori
- Research Institute of Health and Welfare, Kibi International University, Takahashi, Japan
| | - Yoshiteru Oshima
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Haruhisa Kikuchi
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan.,Division of Natural Medicines, Faculty of Pharmacy, Keio University, Tokyo, Japan
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4
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A Phenylfurocoumarin Derivative Reverses ABCG2-Mediated Multidrug Resistance In Vitro and In Vivo. Int J Mol Sci 2021; 22:ijms222212502. [PMID: 34830383 PMCID: PMC8618058 DOI: 10.3390/ijms222212502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 11/11/2021] [Accepted: 11/16/2021] [Indexed: 11/17/2022] Open
Abstract
The ATP-binding cassette subfamily G member 2 (ABCG2) transporter is involved in the development of multidrug resistance in cancer patients. Many inhibitors of ABCG2 have been reported to enhance the chemosensitivity of cancer cells. However, none of these inhibitors are being used clinically. The aim of this study was to identify novel ABCG2 inhibitors by high-throughput screening of a chemical library. Among the 5812 compounds in the library, 23 compounds were selected in the first screening, using a fluorescent plate reader-based pheophorbide a (PhA) efflux assay. Thereafter, to validate these compounds, a flow cytometry-based PhA efflux assay was performed and 16 compounds were identified as potential inhibitors. A cytotoxic assay was then performed to assess the effect these 16 compounds had on ABCG2-mediated chemosensitivity. We found that the phenylfurocoumarin derivative (R)-9-(3,4-dimethoxyphenyl)-4-((3,3-dimethyloxiran-2-yl)methoxy)-7H-furo [3,2-g]chromen-7-one (PFC) significantly decreased the IC50 of SN-38 in HCT-116/BCRP colon cancer cells. In addition, PFC stimulated ABCG2-mediated ATP hydrolysis, suggesting that this compound interacts with the substrate-binding site of ABCG2. Furthermore, PFC reversed the resistance to irinotecan without causing toxicity in the ABCG2-overexpressing HCT-116/BCRP cell xenograft mouse model. In conclusion, PFC is a novel inhibitor of ABCG2 and has promise as a therapeutic to overcome ABCG2-mediated MDR, to improve the efficiency of cancer chemotherapy.
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Biji M, Prabha B, Lankalapalli RS, Radhakrishnan KV. Transition Metal/Lewis Acid Catalyzed Reactions of Zerumbone for Diverse Molecular Motifs. CHEM REC 2021; 21:3943-3953. [PMID: 34708494 DOI: 10.1002/tcr.202100206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 09/12/2021] [Accepted: 09/13/2021] [Indexed: 11/09/2022]
Abstract
Zerumbone is a naturally occurring humulene type sesquiterpene, isolated from the rhizomes of Zingiber zerumbet (L.) Smith with excellent therapeutic potential and is recognized as a valuable synthon for the construction of diverse array of natural product motifs. In this review, we intended to highlight our achievements in utilizing abundant natural product zerumbone and its derivatives for the development of pharmacologically relevant molecular scaffolds. We provided an account of the transition-metal catalyzed 1,4-conjugate addition reactions of zerumbone and its derivatives along with palladium-catalyzed cross-couplings, transition metal-based Lewis acid promoted interrupted Nazarov cyclisation reaction with substituted indoles and transannular cyclizations, photo-induced transformations of zerumbone and its epoxide.
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Affiliation(s)
- Mohanan Biji
- Organic Chemistry Section, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, India-, 695019.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Bernard Prabha
- Organic Chemistry Section, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, India-, 695019
| | - Ravi S Lankalapalli
- Organic Chemistry Section, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, India-, 695019.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Kokkuvayil Vasu Radhakrishnan
- Organic Chemistry Section, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, India-, 695019.,Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, 201002, India
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Pourghasemi Lati M, Ståhle J, Meyer M, Verho O. A Study of an 8-Aminoquinoline-Directed C(sp 2)-H Arylation Reaction on the Route to Chiral Cyclobutane Keto Acids from Myrtenal. J Org Chem 2021; 86:8527-8537. [PMID: 34042431 PMCID: PMC8279478 DOI: 10.1021/acs.joc.1c00774] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
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This work outlines
a synthetic route that can be used to access
chiral cyclobutane keto acids with two stereocenters in five steps
from the inexpensive terpene myrtenal. Furthermore, the developed
route includes an 8-aminoquinoline-directed C(sp2)–H
arylation as one of its key steps, which allows a wide range of aryl
and heteroaryl groups to be incorporated into the bicyclic myrtenal
scaffold prior to the ozonolysis-based ring-opening step that furnishes
the target cyclobutane keto acids. This synthetic route is expected
to find many applications connected to the synthesis of natural product-like
compounds and small molecule libraries.
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Affiliation(s)
- Monireh Pourghasemi Lati
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Jonas Ståhle
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Michael Meyer
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Oscar Verho
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden.,Department of Medicinal Chemistry, Uppsala Biomedical Centre, Uppsala University, SE-751 23 Uppsala, Sweden
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