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Kempthorne CJ, St Pierre M, Le A, Livingstone S, McNulty J, Cadotte MW, Liscombe DK. Mass spectrometry-based metabolomics for the elucidation of alkaloid biosynthesis and function in invasive Vincetoxicum rossicum populations. Phytochemistry 2024; 221:114051. [PMID: 38452878 DOI: 10.1016/j.phytochem.2024.114051] [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] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 02/23/2024] [Accepted: 03/02/2024] [Indexed: 03/09/2024]
Abstract
The genus Vincetoxicum includes a couple of highly invasive vines in North America that threaten biodiversity and challenge land management strategies. Vincetoxicum species are known to produce bioactive phenanthroindolizidine alkaloids that might play a role in the invasiveness of these plants via chemical interactions with other organisms. Untargeted, high-resolution mass spectrometry-based metabolomics approaches were used to explore specialized metabolism in Vincetoxicum plants collected from invaded sites in Ontario, Canada. All metabolites corresponding to alkaloids in lab and field samples of V. rossicum and V. nigrum were identified, which collectively contained 25 different alkaloidal features. The biosynthesis of these alkaloids was investigated by the incorporation of the stable isotope-labelled phenylalanine precursor providing a basis for an updated biosynthetic pathway accounting for the rapid generation of chemical diversity in invasive Vincetoxicum. Aqueous extracts of aerial Vincetoxicum rossicum foliage had phytotoxic activity against seedlings of several species, resulting in identification of tylophorine as a phytotoxin; tylophorine and 14 other alkaloids from Vincetoxicum accumulated in soils associated with full-sun and a high-density of V. rossicum. Using desorption-electrospray ionization mass spectrometry, 15 alkaloids were found to accumulate at wounded sites of V. rossicum leaves, a chemical cocktail that would be encountered by feeding herbivores. Understanding the specialized metabolism of V. rossicum provides insight into the roles and influences of phenanthroindolizidine alkaloids in ecological systems and enables potential, natural product-based approaches for the control of invasive Vincetoxicum and other weedy species.
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Affiliation(s)
- Christine J Kempthorne
- Vineland Research and Innovation Centre, 4890 Victoria Ave North, Box 4000, Vineland Station, Ontario, L0R 2E0, Canada; Centre for Biotechnology, Brock University, 1812 Sir Isaac Brock Way, St Catharines, Ontario, L2S 3A1, Canada
| | - Max St Pierre
- Department of Chemistry and Chemical Biology, McMaster University, 1280 Main St W, Hamilton, Ontario, L8S 4L8, Canada
| | - Andrew Le
- Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
| | - Stuart Livingstone
- Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
| | - James McNulty
- Department of Chemistry and Chemical Biology, McMaster University, 1280 Main St W, Hamilton, Ontario, L8S 4L8, Canada
| | - Marc W Cadotte
- Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
| | - David K Liscombe
- Vineland Research and Innovation Centre, 4890 Victoria Ave North, Box 4000, Vineland Station, Ontario, L0R 2E0, Canada; Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St Catharines, Ontario, L2S 3A1, Canada.
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2
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Gammatantrawet N, Nguyễn CT, Susawaengsup C, Ramli ANM, Tongkoom K, Chatsungnoen T, Dangtungee R, Bhuyar P. Phytochemistry of Medicinal Herbs Belongs to Asclepiadaceae Family for Therapeutic Applications: A Critical Review. Mol Biotechnol 2024:10.1007/s12033-024-01122-9. [PMID: 38507018 DOI: 10.1007/s12033-024-01122-9] [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: 12/18/2023] [Accepted: 02/13/2024] [Indexed: 03/22/2024]
Abstract
The world of pharmaceutical research has been increasingly turning its gaze toward the treasure trove of natural products in search of novel drugs and therapeutic agents. Amidst the vast array of medicinal plants that dot our planet, the Asclepiadaceae family unexplored species have piqued the interest of researchers. Both medicinal plants are indigenous to specific regions and have been integral to traditional medicine systems for centuries. This systematic review aims to provide a comprehensive summary of the current knowledge regarding the phytochemical profile of these plants and their potential implications in the pharmaceutical industry. These plants are rich in phytochemical constituents such as alkaloids, flavonoids, terpenoids, phenolic compounds, glycosides, and saponins. These constituents have been found to exhibit a range of pharmacological activities. They have antimicrobial properties, providing a defense against various microorganisms. They also show anti-inflammatory properties, helping to reduce inflammation in the body. In addition, these plants have antioxidant properties, which help protect cells from damage by harmful free radicals. They have shown anticancer activity, offering potential for cancer treatment. Their neuroprotective properties could be beneficial in treating neurological disorders. The analgesic properties of these plants could be harnessed for pain relief. Furthermore, they have antidiabetic properties, offering potential for diabetes management. The hope is that this review will stimulate further research into these fascinating plants and contribute to discovering new drugs from natural herbs.
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Affiliation(s)
| | - Chuyên Thuận Nguyễn
- Organic Agriculture Management, International College, Maejo University, Chiang Mai, 50290, Thailand
| | - Chanthana Susawaengsup
- Maejo University Phrae Campus, Mae Sai, Rong Kwang District, Phrae, 54140, Thailand
- International Industry and Agriculture Innovation Research Center (IIAR), International College, Maejo University, Chiang Mai, 50290, Thailand
| | - Aizi Nor Mazila Ramli
- Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang Al-Sultan Abdullah (UMPSA), Lebuhraya Tun Abdul Razak, Gambang, 26300, Pahang, Malaysia
| | - Krittiya Tongkoom
- Organic Agriculture Management, International College, Maejo University, Chiang Mai, 50290, Thailand
- International Industry and Agriculture Innovation Research Center (IIAR), International College, Maejo University, Chiang Mai, 50290, Thailand
| | - Tawan Chatsungnoen
- Maejo University Phrae Campus, Mae Sai, Rong Kwang District, Phrae, 54140, Thailand
- International Industry and Agriculture Innovation Research Center (IIAR), International College, Maejo University, Chiang Mai, 50290, Thailand
| | - Rapeephun Dangtungee
- Organic Agriculture Management, International College, Maejo University, Chiang Mai, 50290, Thailand
- International Industry and Agriculture Innovation Research Center (IIAR), International College, Maejo University, Chiang Mai, 50290, Thailand
| | - Prakash Bhuyar
- Organic Agriculture Management, International College, Maejo University, Chiang Mai, 50290, Thailand.
- International Industry and Agriculture Innovation Research Center (IIAR), International College, Maejo University, Chiang Mai, 50290, Thailand.
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Lu CY, Huang ZY, Chen MC, Liu HK, Lee SS, Chang CC. Isolation of GLP-1 enhancing indolizidine alkaloids from Boehmeria formosana. J Food Drug Anal 2023; 31:739-771. [PMID: 38526826 PMCID: PMC10962671 DOI: 10.38212/2224-6614.3483] [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: 06/07/2023] [Accepted: 11/07/2023] [Indexed: 03/27/2024] Open
Abstract
Boehmeria formosana, with its related species, demonstrates anti-glycemic effect, inhibition of HBV production, anti-cancer activities, etc. Some indolizidine alkaloids from the same genus are bioactive but sensitive to light. To overcome this problem and obtain more phenanthroindolizidine alkaloids, isolation was performed in darkness, yielding 10 new indolizidine alkaloids and 17 known compounds. Among them, seven enhanced glucagon-like receptor 1 (GLP-1) activity at 50 mM, especially 14 and 6 (3.5- and 2.3-fold than the negative control). This procedure yielded bioactive indolizidine alkaloids with novel structures.
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Affiliation(s)
- Ching-Yi Lu
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei 10050,
Taiwan
| | - Zheng-Ying Huang
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei 10050,
Taiwan
| | - Meng-Chin Chen
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei 10050,
Taiwan
| | - Hui-Kang Liu
- National Research Institute of Chinese Medicine, Taipei 11221,
Taiwan
| | - Shoei-Sheng Lee
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei 10050,
Taiwan
| | - Chia-Chuan Chang
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei 10050,
Taiwan
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St Pierre M, Kempthorne CJ, Liscombe DK, McNulty J. Rapid entry to phenanthroindolizidine alkaloids via an acid-catalysed acyliminium ion-electrocyclization cascade. Org Biomol Chem 2023; 21:8075-8078. [PMID: 37665044 DOI: 10.1039/d3ob01359f] [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: 09/05/2023]
Abstract
A rapid total synthesis of seco-phenanthroindolizidine alkaloids was achieved involving a one-pot acid catalyzed deprotection- condensation-electrocyclization strategy. This synthetic route provided a concise synthesis of (±)-seco-antofine and (±)-septicine in only 4 steps with an overall yield of 22% and 17%, respectively.
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Affiliation(s)
- Max St Pierre
- Department of Chemistry & Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada.
| | - Christine J Kempthorne
- Vineland Research and Innovation Centre, 4890 Victoria Ave North, Box 4000, Vineland Station, Ontario L0R 2E0, Canada
| | - David K Liscombe
- Vineland Research and Innovation Centre, 4890 Victoria Ave North, Box 4000, Vineland Station, Ontario L0R 2E0, Canada
| | - James McNulty
- Department of Chemistry & Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada.
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5
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Di Sotto A, Valipour M, Azari A, Di Giacomo S, Irannejad H. Benzoindolizidine Alkaloids Tylophorine and Lycorine and Their Analogues with Antiviral, Anti-Inflammatory, and Anticancer Properties: Promises and Challenges. Biomedicines 2023; 11:2619. [PMID: 37892993 PMCID: PMC10603990 DOI: 10.3390/biomedicines11102619] [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: 08/09/2023] [Revised: 09/20/2023] [Accepted: 09/21/2023] [Indexed: 10/29/2023] Open
Abstract
Ongoing viral research, essential for public health due to evolving viruses, gains significance owing to emerging viral infections such as the SARS-CoV-2 pandemic. Marine and plant alkaloids show promise as novel potential pharmacological strategies. In this narrative review, we elucidated the potential of tylophorine and lycorine, two naturally occurring plant-derived alkaloids with a shared benzoindolizidine scaffold, as antiviral agents to be potentially harnessed against respiratory viral infections. Possible structure-activity relationships have also been highlighted. The substances and their derivatives were found to be endowed with powerful and broad-spectrum antiviral properties; moreover, they were able to counteract inflammation, which often underpins the complications of viral diseases. At last, their anticancer properties hold promise not only for advancing cancer research but also for mitigating the oncogenic effects of viruses. This evidence suggests that tylophorine and lycorine could effectively counteract the pathogenesis of respiratory viral disease and its harmful effects. Although common issues about the pharmacologic development of natural substances remain to be addressed, the collected evidence highlights a possible interest in tylophorine and lycorine as antiviral and/or adjuvant strategies and encourages future more in-depth pre-clinical and clinical investigations to overcome their drawbacks and harness their power for therapeutic purposes.
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Affiliation(s)
- Antonella Di Sotto
- Department of Physiology and Pharmacology “V. Erspamer”, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy;
| | - Mehdi Valipour
- Razi Drug Research Center, Iran University of Medical Sciences, Tehran 14496-14535, Iran
| | - Aala Azari
- Environment and Health, Department of Public Health and Primary Care, KU Leuven, Herestraat 49, 3000 Leuven, Belgium;
| | - Silvia Di Giacomo
- Department of Physiology and Pharmacology “V. Erspamer”, Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy;
- Department of Food Safety, Nutrition and Veterinary Public Health, National Institute of Health, 00161 Rome, Italy
| | - Hamid Irannejad
- Department of Medicinal Chemistry, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari 48471-93698, Iran;
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Lee S, Shin JE, Yoon R, Yoo H, Kim S. Annulation of O-silyl N, O-ketene acetals with alkynes for the synthesis of dihydropyridinones and its application in concise total synthesis of phenanthroindolizidine alkaloids. Front Chem 2023; 11:1267422. [PMID: 37810583 PMCID: PMC10551152 DOI: 10.3389/fchem.2023.1267422] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 08/28/2023] [Indexed: 10/10/2023] Open
Abstract
The formation of N-heterocycles with multiple substituents is important in organic synthesis. Herein, we report a novel method for the construction of functionalized dihydropyridinone rings through the annulation of an amide α-carbon with a tethered alkyne moiety. The reaction of the amide with the alkyne was achieved via O-silyl N,O-ketene acetal formation and silver-mediated addition. Furthermore, the developed method was applied for the total synthesis of phenanthroindolizidine and phenanthroquinolizidine alkaloids. By varying the coupling partners, a concise and collective total synthesis of these alkaloids was achieved.
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Affiliation(s)
- Seokwoo Lee
- College of Pharmacy, Seoul National University, Seoul, Republic of Korea
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Jae Eui Shin
- College of Pharmacy, Seoul National University, Seoul, Republic of Korea
| | - Ran Yoon
- College of Pharmacy, Seoul National University, Seoul, Republic of Korea
| | - Hanbin Yoo
- College of Pharmacy, Seoul National University, Seoul, Republic of Korea
| | - Sanghee Kim
- College of Pharmacy, Seoul National University, Seoul, Republic of Korea
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7
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Sa Y, Lv X, Yao JY, Lu XY, Wu AB, Shu WM, Yu WC. Tandem Ene/[4 + 2] Cycloaddition Reaction for the Synthesis of 9-Benzylphenanthrenes from Arynes and α-(Bromomethyl)styrenes. J Org Chem 2023. [PMID: 37319302 DOI: 10.1021/acs.joc.3c00051] [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: 06/17/2023]
Abstract
A tandem reaction for the synthesis of phenanthrenes from arynes and α-(bromomethyl)styrenes is reported. The transformation proceeds via an ene reaction of α-(bromomethyl)styrenes with arynes, followed by a [4 + 2] cycloaddition reaction. The reaction generates 9-benzylphenanthrene derivatives in moderate to excellent yields.
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Affiliation(s)
- Yun Sa
- Hubei Engineering Research Centers for Clean Production and Pollution Control of Oil and Gas Fields, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, P. R. China
| | - Xin Lv
- Hubei Engineering Research Centers for Clean Production and Pollution Control of Oil and Gas Fields, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, P. R. China
| | - Jia-Yu Yao
- Hubei Engineering Research Centers for Clean Production and Pollution Control of Oil and Gas Fields, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, P. R. China
| | - Xu-Yang Lu
- Hubei Engineering Research Centers for Clean Production and Pollution Control of Oil and Gas Fields, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, P. R. China
| | - Ai-Bin Wu
- Hubei Engineering Research Centers for Clean Production and Pollution Control of Oil and Gas Fields, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, P. R. China
| | - Wen-Ming Shu
- Hubei Engineering Research Centers for Clean Production and Pollution Control of Oil and Gas Fields, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, P. R. China
| | - Wei-Chu Yu
- Hubei Engineering Research Centers for Clean Production and Pollution Control of Oil and Gas Fields, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, P. R. China
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8
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Wan Othman WNN, Salim F, Abdullah NN, Abu Bakar SI, Awang K, Jayasinghe L, Ismail NH. ( R)-13a α-Densiindolizidine, A New Phenanthroindolizidine Alkaloid From Cryptocarya densiflora Blume (Lauraceae) and Molecular Docking Against SARS-CoV-2. Nat Prod Commun 2022. [DOI: 10.1177/1934578x221114227] [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
Cryptocarya densiflora Blume (Lauraceae) is an evergreen tree widely distributed throughout the hills and mountain forests up to 1500 m in Malaysia and Indonesia. The plant has been reported to contain phenanthroindolizidine-type of alkaloids. In the present work, a new phenanthroindolizidine alkaloid named ( R)-13a α-densiindolizidine, was isolated from the dichloromethane (DCM) extract of the leaves. The structure of the alkaloid was established based on 1D and 2D nuclear magnetic resonance (NMR) and liquid chromatography mass spectrometry-ion trap-time of flight (LCMS-IT-TOF) analysis. ( R)-13a α-densiindolizidine displayed binding interactions with crucial amino acid residues in the active sites ofsevere acute respiratory syndrome coronavirus 2 Mpro (SARS-CoV-2 Mpro) and RNA-dependent protease (RdRp) in silico, whilst fulfilling theabsorption, distribution, metabolism, excretion, and toxicity (ADMET) criteria and Lipinsky's rule, thus revealing its potential as a lead compound.
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Affiliation(s)
- Wan N Nazneem Wan Othman
- Atta-ur-Rahman Institute for Natural Products Discovery, Universiti Teknologi MARA, Bandar Puncak Alam, Selangor, Malaysia
| | - Fatimah Salim
- Atta-ur-Rahman Institute for Natural Products Discovery, Universiti Teknologi MARA, Bandar Puncak Alam, Selangor, Malaysia
- Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia
| | - Nor N Abdullah
- Atta-ur-Rahman Institute for Natural Products Discovery, Universiti Teknologi MARA, Bandar Puncak Alam, Selangor, Malaysia
- Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia
| | - Syahrul I Abu Bakar
- Atta-ur-Rahman Institute for Natural Products Discovery, Universiti Teknologi MARA, Bandar Puncak Alam, Selangor, Malaysia
- Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia
| | - Khalijah Awang
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | | | - Nor H Ismail
- Atta-ur-Rahman Institute for Natural Products Discovery, Universiti Teknologi MARA, Bandar Puncak Alam, Selangor, Malaysia
- Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia
- National Institute of Fundamental Studies, Kandy, Sri Lanka
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9
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Bajalia EM, Azzouz FB, Chism DA, Giansiracusa DM, Wong CG, Plaskett KN, Bishayee A. Phytochemicals for the Prevention and Treatment of Renal Cell Carcinoma: Preclinical and Clinical Evidence and Molecular Mechanisms. Cancers (Basel) 2022; 14:3278. [PMID: 35805049 PMCID: PMC9265746 DOI: 10.3390/cancers14133278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 06/26/2022] [Accepted: 06/30/2022] [Indexed: 11/18/2022] Open
Abstract
Simple Summary Renal cell carcinoma (RCC) is the most frequently diagnosed kidney cancer. Once RCC metastasizes, successful treatment is difficult to achieve. There is an apparent need for novel approaches to prevent and treat RCC. Phytochemicals are naturally derived compounds gaining increasing scientific interest due to their cancer preventive and chemotherapeutic properties. These phytochemicals have been shown to exhibit a multitude of anticancer effects against RCC. In this systematic review, we critically evaluate the potential these natural compounds possess for the prevention and treatment of RCC and discuss the future implications this may have in the fight against kidney cancer. Abstract Renal cell carcinoma (RCC) is associated with about 90% of renal malignancies, and its incidence is increasing globally. Plant-derived compounds have gained significant attention in the scientific community for their preventative and therapeutic effects on cancer. To evaluate the anticancer potential of phytocompounds for RCC, we compiled a comprehensive and systematic review of the available literature. Our work was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses criteria. The literature search was performed using scholarly databases such as PubMed, Scopus, and ScienceDirect and keywords such as renal cell carcinoma, phytochemicals, cancer, tumor, proliferation, apoptosis, prevention, treatment, in vitro, in vivo, and clinical studies. Based on in vitro results, various phytochemicals, such as phenolics, terpenoids, alkaloids, and sulfur-containing compounds, suppressed cell viability, proliferation and growth, showed cytotoxic activity, inhibited invasion and migration, and enhanced the efficacy of chemotherapeutic drugs in RCC. In various animal tumor models, phytochemicals suppressed renal tumor growth, reduced tumor size, and hindered angiogenesis and metastasis. The relevant antineoplastic mechanisms involved upregulation of caspases, reduction in cyclin activity, induction of cell cycle arrest and apoptosis via modulation of a plethora of cell signaling pathways. Clinical studies demonstrated a reduced risk for the development of kidney cancer and enhancement of the efficacy of chemotherapeutic drugs. Both preclinical and clinical studies displayed significant promise of utilizing phytochemicals for the prevention and treatment of RCC. Further research, confirming the mechanisms and regulatory pathways, along with randomized controlled trials, are needed to establish the use of phytochemicals in clinical practice.
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Liu JH, Wen W, Liao J, Shen QW, Lin Y, Wu ZL, Cai T, Guo QX. Catalytic asymmetric Tsuji-Trost α-benzylation reaction of N-unprotected amino acids and benzyl alcohol derivatives. Nat Commun 2022; 13:2509. [PMID: 35523802 DOI: 10.1038/s41467-022-30277-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 04/20/2022] [Indexed: 01/07/2023] Open
Abstract
Catalytic asymmetric Tsuji–Trost benzylation is a promising strategy for the preparation of chiral benzylic compounds. However, only a few such transformations with both good yields and enantioselectivities have been achieved since this reaction was first reported in 1992, and its use in current organic synthesis is restricted. In this work, we use N-unprotected amino acid esters as nucleophiles in reactions with benzyl alcohol derivatives. A ternary catalyst comprising a chiral aldehyde, a palladium species, and a Lewis acid is used to promote the reaction. Both mono- and polycyclic benzyl alcohols are excellent benzylation reagents. Various unnatural optically active α-benzyl amino acids are produced in good-to-excellent yields and with good-to-excellent enantioselectivities. This catalytic asymmetric method is used for the formal synthesis of two somatostatin mimetics and the proposed structure of natural product hypoestestatin 1. A mechanism that plausibly explains the stereoselective control is proposed. The catalytic asymmetric benzylations of prochiral nucleophiles are very limited. Here, the authors disclose an asymmetric α−benzylation of N-unprotected amino acids with benzyl alcohol derivatives by a chiral aldehyde-involved catalytic system.
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11
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Disadee W, Ruchirawat S. Oxazaborolidine-catalyzed reductive parallel kinetic resolution of ketones from β-nitro-azabicycles for the synthesis of chiral hypoestestatins 1, 2. Org Biomol Chem 2021; 19:8794-8805. [PMID: 34586134 DOI: 10.1039/d1ob01608c] [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: 11/21/2022]
Abstract
A novel approach for the synthesis of 13a-methyl tylophora alkaloids has been reported. The key features included two different synthetic pathways targeted at transforming the β-nitro-azabicycle to the phenanthrene core. The successful steps involved the oxidation of the nitro-piperidine moiety to the corresponding α,β-unsaturated ketone, and an oxidative biaryl coupling reaction for phenanthrene ring formation. Finally, the desired product was obtained via a formal reductive removal of the hydroxyl group. This methodology has been applied for the synthesis of 13a-methyl tylophora alkaloids in up to 65% yield over six steps from β-nitro-azabicycles. Both natural and unnatural enantioenriched hypoestestatins 1 and 2, and related compounds were synthesized using parallel kinetic resolution of the CBS-oxazaborolidine-catalyzed reduction of racemic ketones to provide two separable diastereomeric alcohols in combined yields up to 91% and with high enantioselectvity (up to 89% ee). In addition, the catalytic asymmetric reduction to seco-hypoestestatins 1 and 2 has been reported for the first time. Thus, the ability to develop the racemic mixtures to both enatioenriched forms offers benefit for various biological assays in the future.
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Affiliation(s)
- Wannaporn Disadee
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, Lak Si, Bangkok 10210, Thailand.
| | - Somsak Ruchirawat
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, Lak Si, Bangkok 10210, Thailand. .,Program in Chemical Biology, Chulabhorn Graduate Institute, Laksi, Bangkok 10210, Thailand.,The Center of Excellence on Environmental Health and Toxicology (EHT), Bangkok 10400, Thailand
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12
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Torres J, Escolano M, Alzuet-Piña G, Sánchez-Roselló M, Del Pozo C. Double asymmetric intramolecular aza-Michael reaction: a convenient strategy for the synthesis of quinolizidine alkaloids. Org Biomol Chem 2021; 19:8740-8745. [PMID: 34581390 DOI: 10.1039/d1ob01488a] [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: 11/21/2022]
Abstract
A new methodology to access the quinolizidine skeleton in an asymmetric fashion was devised. It involves two consecutive intramolecular aza-Michael reactions of sulfinyl amines bearing a bis-enone moiety, in turn generated by a monodirectional cross metathesis reaction. The sequence, which takes place with excellent yields and diastereocontrol, was applied to the total synthesis of alkaloids lasubine I and myrtine.
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Affiliation(s)
- Javier Torres
- Department of Organic Chemistry, University of Valencia, Vicente Andrés Estellés s/n, 46100-Burjassot-Valencia, Spain.
| | - Marcos Escolano
- Department of Organic Chemistry, University of Valencia, Vicente Andrés Estellés s/n, 46100-Burjassot-Valencia, Spain.
| | - Gloria Alzuet-Piña
- Department of Inorganic Chemistry, University of Valencia, Vicente Andrés Estellés s/n, 46100-Burjassot-Valencia, Spain
| | - María Sánchez-Roselló
- Department of Organic Chemistry, University of Valencia, Vicente Andrés Estellés s/n, 46100-Burjassot-Valencia, Spain.
| | - Carlos Del Pozo
- Department of Organic Chemistry, University of Valencia, Vicente Andrés Estellés s/n, 46100-Burjassot-Valencia, Spain.
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