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Dutta D, Al Hoque A, Paul B, Park JH, Chowdhury C, Quadir M, Banerjee S, Choudhury A, Laha S, Sepay N, Boro P, Kaipparettu BA, Mukherjee B. EpCAM-targeted betulinic acid analogue nanotherapy improves therapeutic efficacy and induces anti-tumorigenic immune response in colorectal cancer tumor microenvironment. J Biomed Sci 2024; 31:81. [PMID: 39164686 PMCID: PMC11334571 DOI: 10.1186/s12929-024-01069-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 07/09/2024] [Indexed: 08/22/2024] Open
Abstract
BACKGROUND Betulinic acid (BA) has been well investigated for its antiproliferative and mitochondrial pathway-mediated apoptosis-inducing effects on various cancers. However, its poor solubility and off-target activity have limited its utility in clinical trials. Additionally, the immune modulatory role of betulinic acid analogue in the tumor microenvironment (TME) is largely unknown. Here, we designed a potential nanotherapy for colorectal cancer (CRC) with a lead betulinic acid analogue, named as 2c, carrying a 1,2,3-triazole-moiety attached to BA through a linker, found more effective than BA for inhibiting CRC cell lines, and was chosen here for this investigation. Epithelial cell adhesion molecule (EpCAM) is highly overexpressed on the CRC cell membrane. A single-stranded short oligonucleotide sequence, aptamer (Apt), that folds into a 3D-defined architecture can be used as a targeting ligand for its specific binding to a target protein. EpCAM targeting aptamer was designed for site-specific homing of aptamer-conjugated-2c-loaded nanoparticles (Apt-2cNP) at the CRC tumor site to enhance therapeutic potential and reduce off-target toxicity in normal cells. We investigated the in vitro and in vivo therapeutic efficacy and anti-tumorigenic immune response of aptamer conjugated nanotherapy in CRC-TME. METHODS After the characterization of nanoengineered aptamer conjugated betulinic acid nanotherapy, we evaluated therapeutic efficacy, tumor targeting efficiency, and anti-tumorigenic immune response using cell-based assays and mouse and rat models. RESULTS We found that Apt-2cNP improved drug bioavailability, enhanced its biological half-life, improved antiproliferative activity, and minimized off-target cytotoxicity. Importantly, in an in vivo TME, Apt-2cNP showed promising signs of anti-tumorigenic immune response (increased mDC/pDC ratio, enhanced M1 macrophage population, and CD8 T-cells). Furthermore, in vivo upregulation of pro-apoptotic while downregulation of anti-apoptotic genes and significant healing efficacy on cancer tissue histopathology suggest that Apt-2cNP had predominantly greater therapeutic potential than the non-aptamer-conjugated nanoparticles and free drug. Moreover, we observed greater tumor accumulation of the radiolabeled Apt-2cNP by live imaging in the CRC rat model. CONCLUSIONS Enhanced therapeutic efficacy and robust anti-tumorigenic immune response of Apt-2cNP in the CRC-TME are promising indicators of its potential as a prospective therapeutic agent for managing CRC. However, further studies are warranted.
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Affiliation(s)
- Debasmita Dutta
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA.
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, ND, USA.
- Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India.
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA, USA.
- Harvard Medical School, Boston, MA, USA.
| | - Ashique Al Hoque
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, ND, USA
- Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India
| | - Brahamacharry Paul
- Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India
| | - Jun Hyoung Park
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | | | - Mohiuddin Quadir
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, ND, USA
| | - Soumyabrata Banerjee
- Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India
- Department of Psychology and Neuroscience Program, Central Michigan University, Mount Pleasant, MI, 48859, USA
- Department of Human Physiology, Vidyasagar University, Midnapore, 721102, West Bengal, India
| | | | - Soumik Laha
- CSIR- Indian Institute of Chemical Biology, Kolkata, India
| | - Nayim Sepay
- Department of Chemistry, Jadavpur University, Kolkata, India
| | - Priyanka Boro
- CSIR- Indian Institute of Chemical Biology, Kolkata, India
| | | | - Biswajit Mukherjee
- Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India.
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Sol Sol de Medeiros D, Tasca Cargnin S, Azevedo Dos Santos AP, de Souza Rodrigues M, Berton Zanchi F, Soares de Maria de Medeiros P, de Almeida E Silva A, Bioni Garcia Teles C, Baggio Gnoatto SC. Ursolic and betulinic semisynthetic derivatives show activity against CQ-resistant Plasmodium falciparum isolated from Amazonia. Chem Biol Drug Des 2021; 97:1038-1047. [PMID: 33638888 DOI: 10.1111/cbdd.13835] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 01/13/2021] [Accepted: 02/21/2021] [Indexed: 11/29/2022]
Abstract
ACT's low levels of Plasmodium parasitemia clearance are worrisome since it is the last treatment option against P. falciparum. This scenario has led to investigations of compounds with different mechanisms of action for malaria treatment. Natural compounds like ursolic acid (UA) and betulinic acid (BA), distinguished by their activity against numerous microorganisms, including P. falciparum, have become relevant. This study evaluated the antiplasmodial activity of imidazole derivatives of UA and BA against P. falciparum in vitro. Eight molecules were obtained by semisynthesis and tested against P. falciparum strains (NF54 and CQ-resistant 106/cand isolated in Porto Velho, Brazil); 2a and 2b showed activity against NF54 and 106/cand strains with IC50 < 10 µM. They presented high selectivity indexes (SI > 25) and showed synergism when combined with artemisinin. 2b inhibited the parasite's ring and schizont forms regardless of when the treatment began. In silico analysis presented a tight bind of 2b in the topoisomerase II-DNA complex. This study demonstrates the importance of natural derivate compounds as new candidates for malarial treatment with new mechanisms of action. Semisynthesis led to new triterpenes that are active against P. falciparum and may represent new alternatives for malaria drug development.
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Affiliation(s)
- Daniel Sol Sol de Medeiros
- Programa de Pós-Graduação em Biologia Experimental, Porto Velho, Brasil
- Plataforma de Bioensaios em Malária e Leishmaniose - Fundação Oswaldo Cruz, Porto Velho, Brasil
- Instituto Nacional de Epidemiologia na Amazônia Ocidental, Porto Velho, Brasil
| | - Simone Tasca Cargnin
- Laboratório de Fitoquímica e Síntese Orgânica - Programa de Pós-graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil
| | - Ana Paula Azevedo Dos Santos
- Programa de Pós-Graduação em Biologia Experimental, Porto Velho, Brasil
- Plataforma de Bioensaios em Malária e Leishmaniose - Fundação Oswaldo Cruz, Porto Velho, Brasil
- Instituto Nacional de Epidemiologia na Amazônia Ocidental, Porto Velho, Brasil
| | | | - Fernando Berton Zanchi
- Programa de Pós-Graduação em Biologia Experimental, Porto Velho, Brasil
- Instituto Nacional de Epidemiologia na Amazônia Ocidental, Porto Velho, Brasil
- Laboratório de Bioinformática e Química Medicinal - Fundação Oswaldo Cruz, Porto Velho, Brasil
| | | | | | - Carolina Bioni Garcia Teles
- Programa de Pós-Graduação em Biologia Experimental, Porto Velho, Brasil
- Plataforma de Bioensaios em Malária e Leishmaniose - Fundação Oswaldo Cruz, Porto Velho, Brasil
- Instituto Nacional de Epidemiologia na Amazônia Ocidental, Porto Velho, Brasil
| | - Simone Cristina Baggio Gnoatto
- Laboratório de Fitoquímica e Síntese Orgânica - Programa de Pós-graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil
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Dutta D, Paul B, Mukherjee B, Mondal L, Sen S, Chowdhury C, Debnath MC. Nanoencapsulated betulinic acid analogue distinctively improves colorectal carcinoma in vitro and in vivo. Sci Rep 2019; 9:11506. [PMID: 31395908 PMCID: PMC6687831 DOI: 10.1038/s41598-019-47743-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 07/17/2019] [Indexed: 12/19/2022] Open
Abstract
Betulinic acid, a plant secondary metabolite, has gained significant attention due to its antiproliferative activity over a range of cancer cells. A promising betulinic acid analogue (2c) with better therapeutic efficacy than parent molecule to colon carcinoma cells has been reported. Despite impressive biological applications, low aqueous solubility and bioavailability create difficulties for its therapeutic applications. To overcome these lacunae and make it as a promising drug candidate we have encapsulated the lead betulinic acid derivative (2c) in a polymeric nanocarrier system (2c-NP) and evaluated its in vitro and in vivo therapeutic efficacy. Apoptosis that induces in vitro antiproliferative activity was significantly increased by 2c-NP compared to free-drug (2c), as assured by MTT assay, Annexin V positivity, JC1 analysis and cell cycle study. The therapeutic potential measured in vitro and in vivo reflects ability of 2c-NP as an effective therapeutic agent for treatment of colon carcinoma and future translation to clinical trials.
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Affiliation(s)
- Debasmita Dutta
- Department of Pharmaceutical Technology, Jadavpur University, Kolkata, 700032, India
| | - Brahamacharry Paul
- Infectious Diseases and Immunology Division, CSIR- Indian Institute of Chemical Biology, Kolkata, 700032, India
| | - Biswajit Mukherjee
- Department of Pharmaceutical Technology, Jadavpur University, Kolkata, 700032, India.
| | - Laboni Mondal
- Department of Pharmaceutical Technology, Jadavpur University, Kolkata, 700032, India
| | - Suparna Sen
- Organic and Medicinal Chemistry Division, CSIR- Indian Institute of Chemical Biology, Kolkata, 700032, India
| | - Chinmay Chowdhury
- Organic and Medicinal Chemistry Division, CSIR- Indian Institute of Chemical Biology, Kolkata, 700032, India
| | - Mita Chatterjee Debnath
- Infectious Diseases and Immunology Division, CSIR- Indian Institute of Chemical Biology, Kolkata, 700032, India
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Khan MF, Nahar N, Rashid RB, Chowdhury A, Rashid MA. Computational investigations of physicochemical, pharmacokinetic, toxicological properties and molecular docking of betulinic acid, a constituent of Corypha taliera (Roxb.) with Phospholipase A2 (PLA2). BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 2018; 18:48. [PMID: 29391000 PMCID: PMC5795847 DOI: 10.1186/s12906-018-2116-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 01/26/2018] [Indexed: 11/10/2022]
Abstract
BACKGROUND Betulinic acid (BA) is a natural triterpenoid compound and exhibits a wide range of biological and medicinal properties including anti-inflammatory activity. Therefore, this theoretical investigation is performed to evaluate (a) physicochemical properties such as acid dissociation constant (pKa), distribution coefficient (logD), partition coefficient (logP), aqueous solubility (logS), solvation free energy, dipole moment, polarizability, hyperpolarizability and different reactivity descriptors, (b) pharmacokinetic properties like human intestinal absorption (HIA), cellular permeability, skin permeability (PSkin), plasma protein binding (PPB), penetration of the blood brain barrier (BBB), (c) toxicological properties including mutagenicity, carcinogenicity, risk of inhibition of hERG gene and (d) molecular mechanism of anti-inflammatory action which will aid the development of analytical method and the synthesis of BA derivatives. METHODS The physicochemical properties were calculated using MarvinSketch 15.6.29 and Gaussian 09 software package. The pharmacokinetic and toxicological properties were calculated on online server PreADMET. Further, the molecular docking study was conducted on AutoDock vina in PyRx 0.8. RESULTS The aqueous solubility increased with increasing pH due to the ionization of BA leading to decrease in distribution coefficient. The solvation energies in water, dimethyl sulfoxide (DMSO), acetonitrile, n-octanol, chloroform and carbon tetrachloride were - 41.74 kJ/mol, - 53.80 kJ/mol, - 66.27 kJ/mol, - 69.64 kJ/mol, - 65.96 kJ/mol and - 60.13 kJ/mol, respectively. From the results of polarizability and softness, it was clear that BA is less stable and hence, kinetically more reactive in water. BA demonstrated good human intestinal absorption (HIA) and moderate cellular permeability. Further, BA also exhibited positive CNS activity due to high permeability through BBB. The toxicological study revealed that BA was a mutagenic compound but noncarcinogenic in mice model. Moreover, molecular docking study of BA with PLA2 revealed that BA interacts with GLY22 & GLY29 through hydrogen bond formation and LEU2, PHE5, HIS6, ALA17, ALA18, HIS47 and TYR51 through different types of hydrophobic interactions. The binding affinity of BA was - 41.00 kJ/mol which is comparable to the binding affinity of potent inhibitor 6-Phenyl-4(R)-(7-Phenyl-heptanoylamino)-hexanoic acid (BR4) (- 33.89 kJ/mol). CONCLUSIONS Our computed properties may assist the development of analytical method to assay BA or to develop BA derivatives with better pharmacokinetic and toxicological profile.
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Preciado LM, Rey-Suárez P, Henao IC, Pereañez JA. Betulinic, oleanolic and ursolic acids inhibit the enzymatic and biological effects induced by a P-I snake venom metalloproteinase. Chem Biol Interact 2018; 279:219-226. [PMID: 29203373 DOI: 10.1016/j.cbi.2017.12.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 10/17/2017] [Accepted: 12/01/2017] [Indexed: 12/11/2022]
Abstract
Betulinic acid (BA), Oleanolic acid (OA) and Ursolic acid (UA), are pentacyclic triterpenoids with widespread occurrence throughout the plant kingdom, these compounds are widely recognized by their pharmacological and biological properties, such as, anti-tumoral, anti-inflammatory, anti-microbial and hepatoprotective activity. In this work we determined the inhibitory ability of these compounds on the enzymatic, hemorrhagic, myotoxic and edema-inducing activities of Batx-I, a P-I metalloproteinase isolated from Bothrops atrox venom. BA, UA and OA inhibited the proteolytic activity of Batx-I on gelatin with IC50 values of 115.3, 223.0 and 357.3 μM, respectively. Additionally, these compounds showed inhibition of the hemorrhagic activity of Batx-I in skin with IC50 345.7, 643.5 and 1077.0 μM for BA, UA and OA in preincubation experiments. In studies with independent-injection, in which Batx-I was injected and then, at the same site, a concentration of 600 μM of each compound were administered at either 0, 5 or 10 min, BA showed a significant reduction of hemorrhage at 0 and 5 min. In addition, these compounds inhibited myotoxicity and edema-forming activity of Batx-I at 600 μM concentration. Molecular docking studies suggested that these compounds could occupy part of the substrate binding cleft of the enzyme affecting its catalytic cycle. In this manner, triterpenic acids are candidates for the development of inhibitors for the prevention of local tissue damage in snakebite envenomation.
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Affiliation(s)
- Lina María Preciado
- Programa de Ofidismo/Escorpionismo, Facultad de Ciencias Farmacéuticas y Alimentarias, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia
| | - Paola Rey-Suárez
- Programa de Ofidismo/Escorpionismo, Facultad de Ciencias Farmacéuticas y Alimentarias, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia
| | - Isabel Cristina Henao
- Productos Naturales Marinos, Facultad de Ciencias Farmacéuticas y Alimentarias, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia
| | - Jaime Andrés Pereañez
- Programa de Ofidismo/Escorpionismo, Facultad de Ciencias Farmacéuticas y Alimentarias, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia.
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Jain CK, Majumder HK, Roychoudhury S. Natural Compounds as Anticancer Agents Targeting DNA Topoisomerases. Curr Genomics 2017; 18:75-92. [PMID: 28503091 PMCID: PMC5321768 DOI: 10.2174/1389202917666160808125213] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 11/23/2015] [Accepted: 11/26/2015] [Indexed: 12/14/2022] Open
Abstract
DNA topoisomerases are important cellular enzymes found in almost all types of living cells (eukaryotic and prokaryotic). These enzymes are essential for various DNA metabolic processes e.g. replication, transcription, recombination, chromosomal decatenation etc. These enzymes are important molecular drug targets and inhibitors of these enzymes are widely used as effective anticancer and antibacterial drugs. However, topoisomerase inhibitors have some therapeutic limitations and they exert serious side effects during cancer chemotherapy. Thus, development of novel anticancer topoisomerase inhibitors is necessary for improving cancer chemotherapy. Nature serves as a repertoire of structurally and chemically diverse molecules and in the recent years many DNA topoisomerase inhibitors have been identified from natural sources. The present review discusses anticancer properties and therapeutic importance of eighteen recently identified natural topoisomerase inhibitors (from the year 2009 to 2015). Structural characteristics of these novel inhibitors provide backbones for designing and developing new anticancer drugs.
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Affiliation(s)
- Chetan Kumar Jain
- Infectious Diseases and Immunology Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S.C. Mullick Road, Jadavpur, Kolkata-700032, India
| | - Hemanta Kumar Majumder
- Infectious Diseases and Immunology Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S.C. Mullick Road, Jadavpur, Kolkata-700032, India
| | - Susanta Roychoudhury
- Division of Research, Saroj Gupta Cancer Centre & Research Institute, M G Road, Thakurpukur, Kolkata-700 063, India
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Zhang X, Hu J, Chen Y. Betulinic acid and the pharmacological effects of tumor suppression (Review). Mol Med Rep 2016; 14:4489-4495. [PMID: 27748864 DOI: 10.3892/mmr.2016.5792] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2015] [Accepted: 09/21/2016] [Indexed: 11/06/2022] Open
Abstract
Betulinic acid (BA), a lupane-type pentacyclic triterpenoid saponin from tree bark, has the potential to induce the apoptosis of cancer cells without toxicity towards normal cells in vitro and in vivo. The antitumor pharmacological effects of BA consist of triggering apoptosis via the mitochondrial pathway, regulating the cell cycle and the angiogenic pathway via factors, including specificity protein transcription factors, cyclin D1 and epidermal growth factor receptor, inhibiting the signal transducer and activator of transcription 3 and nuclear factor‑κB signaling pathways, preventing the invasion and metastasis of tumor cells, and affecting the expression of topoisomerase I, p53 and lamin B1. In previous years, several studies have shown its antitumor effect, initially applied to malignant melanoma, however, it also has broad efficacies against most solid types of tumor from different regions of the body. There have been few investigations in hematological malignancies, however, this direction may offer potential in such a novel field of research. In this review, the primary pharmacological effects of BA in tumors, particularly in hematological malignancies are discussed.
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Affiliation(s)
- Xia Zhang
- Department of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| | - Jingyu Hu
- Department of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| | - Yan Chen
- Department of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
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Qian C, Wu J, Ji L, Chao H. Topoisomerase IIα poisoning and DNA double-strand breaking by chiral ruthenium(ii) complexes containing 2-furanyl-imidazo[4,5-f][1,10]phenanthroline derivatives. Dalton Trans 2016; 45:10546-55. [DOI: 10.1039/c6dt01422d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Some chiral ruthenium(ii) complexes bearing furan ligands were developed to act as topoisomerase IIα poisons and caused DNA double-strand damage that could lead to apoptosis.
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Affiliation(s)
- Chen Qian
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou
- P. R. China
| | - Jingheng Wu
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou
- P. R. China
| | - Liangnian Ji
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou
- P. R. China
| | - Hui Chao
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou
- P. R. China
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Li H, Webster D, Johnson JA, Gray CA. Anti-mycobacterial triterpenes from the Canadian medicinal plant Alnus incana. JOURNAL OF ETHNOPHARMACOLOGY 2015; 165:148-151. [PMID: 25725435 DOI: 10.1016/j.jep.2015.02.042] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 02/14/2015] [Accepted: 02/17/2015] [Indexed: 06/04/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Alnus incana, commonly known as the gray or speckled alder, is a medicinal plant used by some Canadian First Nations to treat symptoms associated with tuberculosis. The aim of this study was to assess the anti-mycobacterial activity of an Alnus incana bark extract and to identify the active constituents of the extract. MATERIALS AND METHODS Methanolic extracts of the bark of A. incana were subjected to bioassay guided fractionation using Mycobacterium tuberculosis (H37Ra). The active constituents were identified by NMR and MS. RESULTS Four pentacyclic lupane triterpenes were isolated and were identified as betulin, betulinic acid, betulone and lupenone. Betulin displayed a MIC of 12.5 μg/mL and an IC50 of 2.4 μg/mL against M. tuberculosis (H37Ra). Betulinic acid and betulone showed lower anti-mycobacterial activities with IC50 values of 84 and 57 μg/mL respectively. Lupenone was inactive against M. tuberculosis (H37Ra). CONCLUSIONS Betulin, betulinic acid and betulone were identified as the major anti-mycobacterial constituents in the bark of A. incana and the functionality at carbons 3 and 28 of the lupane skeleton would seem to be important in determining the anti-mycobacterial activity of the triterpenes. This work supports the ethnopharmacological use of A. incana by Canadian First Nations communities as a treatment for tuberculosis.
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Affiliation(s)
- Haoxin Li
- Department of Biology, University of New Brunswick, Saint John, New Brunswick, Canada E2L 4L5
| | - Duncan Webster
- Department of Medicine, Division of Infectious Diseases, Saint John Regional Hospital, Saint John, New Brunswick, Canada E2L 4L2
| | - John A Johnson
- Department of Biology, University of New Brunswick, Saint John, New Brunswick, Canada E2L 4L5
| | - Christopher A Gray
- Department of Biology, University of New Brunswick, Saint John, New Brunswick, Canada E2L 4L5; Department of Chemistry, University of New Brunswick, Saint John, New Brunswick, Canada E2L 4L5.
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Lin YS, Huang WC, Chen MS, Hsieh TS. Toward discovering new anti-cancer agents targeting topoisomerase IIα: a facile screening strategy adaptable to high throughput platform. PLoS One 2014; 9:e97008. [PMID: 24809695 PMCID: PMC4014593 DOI: 10.1371/journal.pone.0097008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Accepted: 04/14/2014] [Indexed: 01/18/2023] Open
Abstract
Topoisomerases are a family of vital enzymes capable of resolving topological problems in DNA during various genetic processes. Topoisomerase poisons, blocking reunion of cleaved DNA strands and stabilizing enzyme-mediated DNA cleavage complex, are clinically important antineoplastic and anti-microbial agents. However, the rapid rise of drug resistance that impedes the therapeutic efficacy of these life-saving drugs makes the discovering of new lead compounds ever more urgent. We report here a facile high throughput screening system for agents targeting human topoisomerase IIα (Top2α). The assay is based on the measurement of fluorescence anisotropy of a 29 bp fluorophore-labeled oligonucleotide duplex. Since drug-stabilized Top2α-bound DNA has a higher anisotropy compared with free DNA, this assay can work if one can use a dissociating agent to specifically disrupt the enzyme/DNA binary complexes but not the drug-stabilized ternary complexes. Here we demonstrate that NaClO4, a chaotropic agent, serves a critical role in our screening method to differentiate the drug-stabilized enzyme/DNA complexes from those that are not. With this strategy we screened a chemical library of 100,000 compounds and obtained 54 positive hits. We characterized three of them on this list and demonstrated their effects on the Top2α–mediated reactions. Our results suggest that this new screening strategy can be useful in discovering additional candidates of anti-cancer agents.
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Affiliation(s)
- Yu-Shih Lin
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
| | - Wan-Chen Huang
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
| | - Mei-Shya Chen
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
| | - Tao-shih Hsieh
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
- Department of Biochemistry, Duke University Medical Center, Durham, North Carolina, United States of America
- * E-mail:
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Highlights of Pentacyclic Triterpenoids in the Cancer Settings. STUDIES IN NATURAL PRODUCTS CHEMISTRY 2014. [DOI: 10.1016/b978-0-444-63294-4.00002-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Dillon LW, Pierce LCT, Lehman CE, Nikiforov YE, Wang YH. DNA topoisomerases participate in fragility of the oncogene RET. PLoS One 2013; 8:e75741. [PMID: 24040417 PMCID: PMC3770543 DOI: 10.1371/journal.pone.0075741] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Accepted: 08/19/2013] [Indexed: 11/19/2022] Open
Abstract
Fragile site breakage was previously shown to result in rearrangement of the RET oncogene, resembling the rearrangements found in thyroid cancer. Common fragile sites are specific regions of the genome with a high susceptibility to DNA breakage under conditions that partially inhibit DNA replication, and often coincide with genes deleted, amplified, or rearranged in cancer. While a substantial amount of work has been performed investigating DNA repair and cell cycle checkpoint proteins vital for maintaining stability at fragile sites, little is known about the initial events leading to DNA breakage at these sites. The purpose of this study was to investigate these initial events through the detection of aphidicolin (APH)-induced DNA breakage within the RET oncogene, in which 144 APH-induced DNA breakpoints were mapped on the nucleotide level in human thyroid cells within intron 11 of RET, the breakpoint cluster region found in patients. These breakpoints were located at or near DNA topoisomerase I and/or II predicted cleavage sites, as well as at DNA secondary structural features recognized and preferentially cleaved by DNA topoisomerases I and II. Co-treatment of thyroid cells with APH and the topoisomerase catalytic inhibitors, betulinic acid and merbarone, significantly decreased APH-induced fragile site breakage within RET intron 11 and within the common fragile site FRA3B. These data demonstrate that DNA topoisomerases I and II are involved in initiating APH-induced common fragile site breakage at RET, and may engage the recognition of DNA secondary structures formed during perturbed DNA replication.
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Affiliation(s)
- Laura W. Dillon
- Department of Biochemistry, Wake Forest School of Medicine, Winston-Salem, North Carolina, United States of America
| | - Levi C. T. Pierce
- Department of Chemistry and Biochemistry, University of California-San Diego, La Jolla, California, United States of America
| | - Christine E. Lehman
- Department of Cancer Biology, Wake Forest School of Medicine, Winston-Salem, North Carolina, United States of America
| | - Yuri E. Nikiforov
- Department of Pathology and Laboratory Medicine, University of Pittsburgh, Pennsylvania, United States of America
| | - Yuh-Hwa Wang
- Department of Biochemistry, Wake Forest School of Medicine, Winston-Salem, North Carolina, United States of America
- * E-mail:
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Liu Y, Gao F, Jiang H, Niu L, Bi Y, Young CY, Yuan H, Lou H. Induction of DNA damage and ATF3 by retigeric acid B, a novel topoisomerase II inhibitor, promotes apoptosis in prostate cancer cells. Cancer Lett 2013; 337:66-76. [DOI: 10.1016/j.canlet.2013.05.022] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 05/09/2013] [Accepted: 05/13/2013] [Indexed: 01/26/2023]
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15
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Gu J, Ding G, Chen N, Zhang Z. Development and Validation of a Sensitive LC–MS-MS Assay for the Quantification of Betulonic Acid in Rat Plasma. J Chromatogr Sci 2013; 52:195-200. [DOI: 10.1093/chromsci/bmt010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Betulinic Acid inhibits growth of cultured vascular smooth muscle cells in vitro by inducing g(1) arrest and apoptosis. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2012; 2012:251362. [PMID: 23056140 PMCID: PMC3463985 DOI: 10.1155/2012/251362] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Revised: 08/16/2012] [Accepted: 08/29/2012] [Indexed: 11/18/2022]
Abstract
Betulinic acid is a widely available plant-derived triterpene which is reported to possess selective cytotoxic activity against cancer cells of neuroectodermal origin and leukemia. However, the potential of betulinic acid as an antiproliferative and cytotoxic agent on vascular smooth muscle (VSMC) is still unclear. This study was carried out to demonstrate the antiproliferative and cytotoxic effect of betulinic acid on VSMCs using 3-[4,5-dimethylthizol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) assay, flow cytometry cell cycle assay, BrdU proliferation assay, acridine orange/propidium iodide staining, and comet assay. Result from MTT and BrdU assays indicated that betulinic acid was able to inhibit the growth and proliferation of VSMCs in a dose-dependent manner with IC50 of 3.8 μg/mL significantly (P < 0.05). Nevertheless, betulinic acid exhibited G1 cell cycle arrest in flow cytometry cell cycle profiling and low level of DNA damage against VSMC in acridine orange/propidium iodide and comet assay after 24 h of treatment. In conclusion, betulinic acid induced G1 cell cycle arrest and dose-dependent DNA damage on VSMC.
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Ghaffari Moghaddam M, Bin H. Ahmad F, Samzadeh-Kermani A. Biological Activity of Betulinic Acid: A Review. ACTA ACUST UNITED AC 2012. [DOI: 10.4236/pp.2012.32018] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Gaire BP, Subedi L. Medicinal Plant Diversity and their Pharmacological Aspects of Nepal Himalayas. ACTA ACUST UNITED AC 2011. [DOI: 10.5530/pj.2011.25.2] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Lingadurai S, Roy S, Joseph RV, Nath LK. Antileukemic activity of the leaf extract of Bischofia javanica blume on human leukemic cell lines. Indian J Pharmacol 2011; 43:143-9. [PMID: 21572647 PMCID: PMC3081451 DOI: 10.4103/0253-7613.77348] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2010] [Revised: 08/06/2010] [Accepted: 12/30/2010] [Indexed: 01/11/2023] Open
Abstract
OBJECTIVE Leaves of Bichofia javanica (BJ) have been traditionally used for many ailments including cancer. In the present study, antileukemic activity of the leaf extract was evaluated on human leukemic cell lines. MATERIALS AND METHODS Human leukemic cell lines U937, K562, and HL60 were purchased from National Facility for Animal Tissue and Cell Culture, Pune, India. The cells were routinely maintained in RPMI 1640 medium supplemented with 10% heat inactivated fetal calf serum. Cultures were maintained at 37ºC in a humidified atmosphere containing 5% CO(2) in air. The methanol extract of BJ (MEBJ) was dissolved in PBS and used at the concentrations of 5, 10, and 15 μg/ml for cell viability and cytotoxicity studies (MTT assay). Cell counts were made in quadruplicate samples at the interval of 24, 48, and 72 h and cytarabine (20 μg/ml) served as standard drug. The apoptotic pathway of cytotoxicity was assessed by DNA agarose gel electrophoresis technique and confirmed by fluorescence and confocal microscopic methods at the concentration of 10 μg/ml. RESULTS MEBJ showed significant cytotoxicity (P<0.001) in leukemic cell lines in the in-vitro cell proliferation assay. IC(50) of MEBJ was very low (3.5 μg/ml) at 72 h in the HL60 cell line. The apoptotic pathway of cytotoxicity was observed at 10 μg/ml of MEBJ by the fragmented DNA pattern in the apoptosis assay, chromatin condensation, and apoptotic body formation as revealed in the fluorescence and confocal microscopic studies. CONCLUSION The present findings support the ethno-medicinal use of BJ for cancer by mediating through the apoptosis pathway.
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Affiliation(s)
- Sutharson Lingadurai
- Department of Pharmacology, Himalayan Pharmacy Institute, Majhitar, Sikkim - 737 136, India
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Kikuchi T, Akazawa H, Tabata K, Manosroi A, Manosroi J, Suzuki T, Akihisa T. 3-O-(E)-p-coumaroyl tormentic acid from Eriobotrya japonica leaves induces caspase-dependent apoptotic cell death in human leukemia cell line. Chem Pharm Bull (Tokyo) 2011; 59:378-81. [PMID: 21372421 DOI: 10.1248/cpb.59.378] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Eleven triterpene acids, 1-11, isolated from the leaves of Eriobotrya japonica, were evaluated for inhibition of DNA topoisomerase (Topo) I and cytotoxicity against human leukemia (HL60) and melanoma cell lines (CRL1579). Among the compounds tested, four compounds, δ-oleanolic acid (4), ursolic acid (5), 3-O-(E)-p-coumaroyl tormentic acid (8), and betulinic acid (10), exhibited potent Topo I inhibitory activity (IC(50) 20.3-36.5 µM) and cytotoxicity against HL60 (EC(50) 5.0-8.1 µM). Upon assessing the apoptosis-inducing activity in HL60 cells, compound 8 exhibited induction of apoptosis detected by the observation of DNA fragmentation and membrane phospholipid exposure in flow cytometry. Western blot analysis showed that compound 8 markedly reduced the levels of procaspases-3 and 9, while being increased the levels of cleaved caspases-3 and 9. On the other hand, compound 8 exerted almost no influence on the expression of caspase-8. In addition, compound 8 increased significantly Bax/Bcl-2 ratio and activated caspase-2. These results suggested that compound 8 induced apoptotic cell death in HL60 via mainly mitochondrial pathway by, at least in part, Topo I inhibition. Therefore, compound 8 may be promising lead compound for developing an effective drug for treatment of leukemia.
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Affiliation(s)
- Takashi Kikuchi
- College of Science and Technology, Nihon University, Tokyo, Japan
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21
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New betulinic acid derivatives induce potent and selective antiproliferative activity through cell cycle arrest at the S phase and caspase dependent apoptosis in human cancer cells. Biochimie 2011; 93:1065-75. [DOI: 10.1016/j.biochi.2011.02.014] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2010] [Accepted: 02/24/2011] [Indexed: 01/27/2023]
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Zhang Z, Ownby S, Wang P, Yuan W, Zhang W, Li S. New phenolic compounds from Liatris elegans. Nat Prod Res 2010; 24:1079-85. [DOI: 10.1080/14786410903027789] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Zhizhen Zhang
- a National Center for Pharmaceutical Crops, Arthur Temple College of Forestry and Agriculture , Stephen F. Austin State University , Nacogdoches, TX 75962-6109, USA
| | - Stacy Ownby
- a National Center for Pharmaceutical Crops, Arthur Temple College of Forestry and Agriculture , Stephen F. Austin State University , Nacogdoches, TX 75962-6109, USA
| | - Ping Wang
- a National Center for Pharmaceutical Crops, Arthur Temple College of Forestry and Agriculture , Stephen F. Austin State University , Nacogdoches, TX 75962-6109, USA
| | - Wei Yuan
- a National Center for Pharmaceutical Crops, Arthur Temple College of Forestry and Agriculture , Stephen F. Austin State University , Nacogdoches, TX 75962-6109, USA
| | - Wanli Zhang
- a National Center for Pharmaceutical Crops, Arthur Temple College of Forestry and Agriculture , Stephen F. Austin State University , Nacogdoches, TX 75962-6109, USA
| | - Shiyou Li
- a National Center for Pharmaceutical Crops, Arthur Temple College of Forestry and Agriculture , Stephen F. Austin State University , Nacogdoches, TX 75962-6109, USA
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Abstract
New therapies using novel mechanisms to induce tumor cell death are needed with plants playing a crucial role as a source for potential anticancer compounds. One highly promising class of natural compounds are the triterpenoids with betulinic acid (BetA) as the most prominent representative. In-vitro studies have identified this agent as potently effective against a wide variety of cancer cells, also those derived from therapy-resistant and refractory tumors, whereas it has been found to be relatively nontoxic for healthy cells. In-vivo preclinically applied BetA showed some remarkable anticancer effects and a complete absence of systemic toxicity in rodents. BetA also cooperated with other therapies to induce tumor cell death and several potent derivatives have been discovered. Its antitumor activity has been related to its direct effects on mitochondria where it induces Bax/Bak-independent cytochrome-c release.
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de Sá MS, Costa JFO, Krettli AU, Zalis MG, Maia GLDA, Sette IMF, Câmara CDA, Filho JMB, Giulietti-Harley AM, Ribeiro Dos Santos R, Soares MBP. Antimalarial activity of betulinic acid and derivatives in vitro against Plasmodium falciparum and in vivo in P. berghei-infected mice. Parasitol Res 2009; 105:275-9. [PMID: 19367418 DOI: 10.1007/s00436-009-1394-0] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2008] [Accepted: 03/03/2009] [Indexed: 10/20/2022]
Abstract
Malaria is one of the most important tropical diseases and mainly affects populations living in developing countries. Reduced sensitivity of Plasmodium sp. to formerly recommended antimalarial drugs places an increasing burden on malaria control programs as well as on national health systems in endemic countries. The present study aims to evaluate the antimalarial activity of betulinic acid and its derivative compounds, betulonic acid, betulinic acid acetate, betulinic acid methyl ester, and betulinic acid methyl ester acetate. These substances showed antiplasmodial activity against chloroquine-resistant Plasmodium falciparum parasites in vitro, with IC(50) values of 9.89, 10.01, 5.99, 51.58, and 45.79 microM, respectively. Mice infected with Plasmodium berghei and treated with betulinic acid acetate had a dose-dependent reduction of parasitemia. Our results indicate that betulinic acid and its derivative compounds are candidates for the development of new antimalarial drugs.
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Affiliation(s)
- Matheus Santos de Sá
- Centro de Pesquisas Gonçalo Moniz, Fundação Oswaldo Cruz, Salvador, Bahia, Brazil
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Ma Z, Hano Y, Qiu F, Shao G, Chen Y, Nomura T. Triterpenoids and Alkaloids from the Roots of Peganum Nigellastrum. Nat Prod Commun 2008. [DOI: 10.1177/1934578x0800300208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Four lupane-type triterpenoids (1–4) and seven alkaloids (5–11) were isolated from the roots of Peganum nigellastrum. On the basis of spectroscopic and chemical evidence, the structures of the compounds were elucidated as 3α-hydroxy-27- trans-caffeoyloxylup-20(29)-en-28-oic acid methyl ester (1), 3β-hydroxy-27- trans-caffeoyloxylup-20(29)-en-28-oic acid methyl ester (2), 3α-acetoxy-27- trans-caffeoyloxylup-20(29)-en-28-oic acid methyl ester (3), 3β-acetoxy-27- trans-caffeoyloxylup-20(29)-en-28-oic acid methyl ester (4), luotonin C (5), luotonin D (6), harmine (7), harmol (8), harmaline (9), deoxyvasicinone (10) and vasicinone (11). Compounds 1, 3 and 4 are novel triterpenoids, and these pentacyclic triterpenoids were evaluated for their cytotoxicity against the androgen-sensitive LNCaP and androgen-independent PC-3 human prostate cancer cells.
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Affiliation(s)
- Zhongze Ma
- Bio-Organic and Natural Products Laboratory, McLean Hospital, Harvard Medical School, 115 Mill Street, Belmont, MA 02478, USA
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba, 274-8510, Japan
| | - Yoshio Hano
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba, 274-8510, Japan
| | - Feng Qiu
- Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, China
| | - Gang Shao
- Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, China
| | - Yingjie Chen
- Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, China
| | - Taro Nomura
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba, 274-8510, Japan
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Lavoie JM, Stevanovic T. Selective ultrasound-assisted extractions of lipophilic constituents from Betula alleghaniensis and B. papyrifera wood at low temperatures. PHYTOCHEMICAL ANALYSIS : PCA 2007; 18:291-9. [PMID: 17623363 DOI: 10.1002/pca.981] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Betula alleghaniensis and B. papyrifera are widely distributed in the province of Québec (Canada) and, since these trees are valuable exports for the local lumber industry, large amounts of their residual ligneous biomass are available for further exploitation. Betula species are well known for their significant concentrations of triterpenes, some of which were recently discovered to present promising bioactivity. The secondary transformation of birch biomass could therefore become important for many industries, particularly the pharmaceutical industry. In the present study, extracts from birch sawdust were obtained using an optimised ultrasound-assisted extraction in which the careful choice of temperature permitted a selective extraction of the targeted triterpenes. Moreover, compared with the classical Soxhlet method, higher extraction yields were obtained in a shorter time. The lipophilic extracts obtained using dichloromethane as a solvent were analysed by GC-MS and the major compounds identified as lupane-type cyclic triterpenoids accompanied by the non-cyclic triterpene squalene. Numerous aliphatic long-chain fatty acids were also found in the extracts together with phytosterols. Betulonic acid and squalene, the major extract constituents for both B. alleghaniensis and B. papyrifera, are both bioactive molecules.
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Affiliation(s)
- J-M Lavoie
- Département de Chimie et Biochimie, Université de Moncton, Moncton, Nouveau-Brunswick, E1A3E9, Canada.
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Wada SI, Tanaka R. Isolation, DNA topoisomerase-II inhibition, and cytotoxicity of three new terpenoids from the bark of Macaranga tanarius. Chem Biodivers 2007; 3:473-9. [PMID: 17193283 DOI: 10.1002/cbdv.200690050] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
One new pimarane-type diterpenoid (1) and two new taraxerane-based triterpenoids (2 and 3) were isolated from the bark of Macaranga tanarius, along with seven known compounds. Their structures were identified by spectroscopic methods including NMR and MS analyses. Compounds 1-5 were tested for their in vitro inhibition of DNA topoisomerase II, as well as for their cytotoxicities against human lung carcinoma A549 cells (Table 3). The triterpenoids 2-5 showed strong activities in both assays, but the diterpenoid 1 was only moderately active.
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Affiliation(s)
- Shun-ichi Wada
- Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan.
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