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Huang Y, Li G, Hong C, Zheng X, Yu H, Zhang Y. Potential of Steroidal Alkaloids in Cancer: Perspective Insight Into Structure-Activity Relationships. Front Oncol 2021; 11:733369. [PMID: 34616681 PMCID: PMC8489381 DOI: 10.3389/fonc.2021.733369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 08/12/2021] [Indexed: 11/13/2022] Open
Abstract
Steroidal alkaloids contain both steroidal and alkaloid properties in terms of chemical properties and pharmacological activities. Due to outstanding biological activities such as alkaloids and similar pharmacological effects to other steroids, steroidal alkaloids have received special attention in anticancer activity recently. Substituted groups in chemical structure play markedly important roles in biological activities. Therefore, the effective way to obtain lead compounds quickly is structural modification, which is guided by structure-activity relationships (SARs). This review presents the SAR of steroidal alkaloids and anticancer, including pregnane alkaloids, cyclopregnane alkaloids, cholestane alkaloids, C-nor-D-homosteroidal alkaloids, and bis-steroidal pyrazine. A summary of SAR can powerfully help to design and synthesize more lead compounds.
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Affiliation(s)
- Ying Huang
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province, School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China
| | - Gen Li
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Chong Hong
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province, School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China
| | - Xia Zheng
- The Second Affiliated Hospital of Liaoning University of Traditional Chinese Medicine, Shenyang, China
| | - Haiyang Yu
- State Key Laboratory of Component-Based Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Yan Zhang
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province, School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China
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2
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Agrahari AK, Bose P, Jaiswal MK, Rajkhowa S, Singh AS, Hotha S, Mishra N, Tiwari VK. Cu(I)-Catalyzed Click Chemistry in Glycoscience and Their Diverse Applications. Chem Rev 2021; 121:7638-7956. [PMID: 34165284 DOI: 10.1021/acs.chemrev.0c00920] [Citation(s) in RCA: 159] [Impact Index Per Article: 53.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Copper(I)-catalyzed 1,3-dipolar cycloaddition between organic azides and terminal alkynes, commonly known as CuAAC or click chemistry, has been identified as one of the most successful, versatile, reliable, and modular strategies for the rapid and regioselective construction of 1,4-disubstituted 1,2,3-triazoles as diversely functionalized molecules. Carbohydrates, an integral part of living cells, have several fascinating features, including their structural diversity, biocompatibility, bioavailability, hydrophilicity, and superior ADME properties with minimal toxicity, which support increased demand to explore them as versatile scaffolds for easy access to diverse glycohybrids and well-defined glycoconjugates for complete chemical, biochemical, and pharmacological investigations. This review highlights the successful development of CuAAC or click chemistry in emerging areas of glycoscience, including the synthesis of triazole appended carbohydrate-containing molecular architectures (mainly glycohybrids, glycoconjugates, glycopolymers, glycopeptides, glycoproteins, glycolipids, glycoclusters, and glycodendrimers through regioselective triazole forming modular and bio-orthogonal coupling protocols). It discusses the widespread applications of these glycoproducts as enzyme inhibitors in drug discovery and development, sensing, gelation, chelation, glycosylation, and catalysis. This review also covers the impact of click chemistry and provides future perspectives on its role in various emerging disciplines of science and technology.
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Affiliation(s)
- Anand K Agrahari
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India
| | - Priyanka Bose
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India
| | - Manoj K Jaiswal
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India
| | - Sanchayita Rajkhowa
- Department of Chemistry, Jorhat Institute of Science and Technology (JIST), Jorhat, Assam 785010, India
| | - Anoop S Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India
| | - Srinivas Hotha
- Department of Chemistry, Indian Institute of Science and Engineering Research (IISER), Pune, Maharashtra 411021, India
| | - Nidhi Mishra
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India
| | - Vinod K Tiwari
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India
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Fu B, Li Y, Peng S, Wang X, Hu J, Lv L, Xia C, Lu D, Qin C. Synthesis and pharmacological characterization of glucopyranosyl-conjugated benzyl derivatives as novel selective cytotoxic agents against colon cancer. ROYAL SOCIETY OPEN SCIENCE 2021; 8:201642. [PMID: 33972860 PMCID: PMC8074679 DOI: 10.1098/rsos.201642] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 01/20/2021] [Indexed: 06/12/2023]
Abstract
Glucopyranosyl-conjugated benzyl derivatives containing a [1,2,3]-triazole linker were synthesized. Benzyl served as an important pharmacophore in anti-cancer compounds. Compound 8d inhibited the proliferation of colorectal cancer cells with the potency comparable to 5-fluorouracil (5-FU) with improved selectivity towards cancer cells. The antiproliferative activity of 8d is achieved through triggering apoptotic cell death.
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Affiliation(s)
- Boqiao Fu
- Hubei Provincial Collaborative Innovation Center of Biomass Resources Transformation and Utilization, College of Chemistry and Materials Science, Hubei Engineering University, Hubei 432000, People's Republic of China
| | - Yingjie Li
- Guangdong Institute of Gastroenterology, Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong 510655, People's Republic of China
| | - Shaoyong Peng
- Guangdong Institute of Gastroenterology, Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong 510655, People's Republic of China
| | - Xiaolin Wang
- Guangdong Institute of Gastroenterology, Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong 510655, People's Republic of China
| | - Jingying Hu
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200032, People's Republic of China
| | - Long Lv
- Hubei Provincial Collaborative Innovation Center of Biomass Resources Transformation and Utilization, College of Chemistry and Materials Science, Hubei Engineering University, Hubei 432000, People's Republic of China
| | - Caifen Xia
- Hubei Provincial Collaborative Innovation Center of Biomass Resources Transformation and Utilization, College of Chemistry and Materials Science, Hubei Engineering University, Hubei 432000, People's Republic of China
| | - Dai Lu
- Department of Pharmaceutical Sciences, Rangel College of Pharmacy, Texas A&M University, TX 78363, USA
| | - Caiqin Qin
- Hubei Provincial Collaborative Innovation Center of Biomass Resources Transformation and Utilization, College of Chemistry and Materials Science, Hubei Engineering University, Hubei 432000, People's Republic of China
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4
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Goel B, Tripathi N, Mukherjee D, Jain SK. Glycorandomization: A promising diversification strategy for the drug development. Eur J Med Chem 2021; 213:113156. [PMID: 33460832 DOI: 10.1016/j.ejmech.2021.113156] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 01/04/2021] [Accepted: 01/04/2021] [Indexed: 12/13/2022]
Abstract
Glycorandomization is a natural product derivatization strategy in which different sugar moieties are linked to the aglycone part of the naturally existing glycosides to create glycorandomized libraries. Sugars attached to the natural products are responsible for affecting their solubility, mechanism of action, target recognition, and toxicity and thus, by changing the sugar part, these properties could be modified. Glycorandomization can be done via two approaches (i) a synthetic approach known as neoglycorandomization, and (ii) chemoenzymatic approach including in-vitro and in-vivo glycorandomization. Glycorandomization can be a promising technology for the drug discovery that has proved its potential to improve pharmacokinetic (solubility) and pharmacodynamic profile (mechanism of action, toxicity, and target recognition) of the parent compounds. The substrate flexibility of glycosyltransferases and other enzymes towards sugars and/or aglycone substrates has made this technique versatile. Further, the enzymes can be altered by genetic engineering to generate glycorandomized libraries of diverse natural product scaffolds. This technique has the potential to produce new compounds that can be helpful to the mankind by treating the threatening disease states. This review covers the different strategies for glycorandomization as a tool in drug discovery and development. The fundamentals of glycorandomization, different types, and further development of differentially glycorandomized libraries of natural products and small molecule based drugs have been discussed.
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Affiliation(s)
- Bharat Goel
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, Uttar Pradesh, India
| | - Nancy Tripathi
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, Uttar Pradesh, India
| | - Debaraj Mukherjee
- Natural Product Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu, 180001, India
| | - Shreyans K Jain
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, Uttar Pradesh, India.
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5
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Zhang J, Cui Y, Sun S, Cao J, Fang X. Casticin inhibits the epithelial-mesenchymal transition in ovarian carcinoma via the hedgehog signaling pathway. Oncol Lett 2018. [PMID: 29541219 DOI: 10.3892/ol.2018.7880] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Casticin inhibits migration, invasion and induced apoptosis in numerous cancer cells; however, the Hedgehog (Hh) signaling pathway is a key factor in the epithelial-mesenchymal transition (EMT). The present study aimed to assess whether casticin affects the expression of members of the Hh signaling pathway and EMT effectors in ovarian carcinoma. The ovarian cancer SKOV3 cell line was incubated in the presence of various concentrations of casticin or cyclopamine. Next, the expression levels of the main Hh signaling effector glioma-associated oncogene-1 (Gli-1) and EMT-associated factors [Twist-related protein 1 (Twist1), E-cadherin and N-cadherin] were determined by western blotting and reverse transcription-quantitative polymerase chain reaction. Cell proliferation and growth were assessed using MTT and soft agar assays; cell migration and invasion was evaluated using an in vitro migration assay and a transwell invasion assay, respectively. Compared with control group values, Gli-1, Twist1 and N-cadherin expression levels were reduced, whereas E-cadherin levels were increased in the casticin- and cyclopamine-treated groups. Incubation with casticin or cyclopamine resulted in markedly reduced SKOV3 cell viability, migration and invasion, in a dose-dependent manner. To the best of our knowledge, the findings of the present study indicated for first time that casticin may inhibit EMT via Hh signaling in vitro, reducing the migratory ability of ovarian cancer cells.
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Affiliation(s)
- Jing Zhang
- Department of Gynaecology and Obstetrics, The Second Affiliated Hospital of Central South University, Changsha, Hunan 410011, P.R. China.,Department of Gynaecology and Obstetrics, The First Affiliated Hospital of University of South China, Hengyang, Hunan 421001, P.R. China
| | - Yinghong Cui
- Department of Pharmaceutical Sciences, Medical College, Hunan Normal University, Changsha, Hunan 410013, P.R. China
| | - Shuwen Sun
- Department of Pharmaceutical Sciences, Medical College, Hunan Normal University, Changsha, Hunan 410013, P.R. China
| | - Jianguo Cao
- Department of Pharmaceutical Sciences, Medical College, Hunan Normal University, Changsha, Hunan 410013, P.R. China
| | - Xiaoling Fang
- Department of Gynaecology and Obstetrics, The Second Affiliated Hospital of Central South University, Changsha, Hunan 410011, P.R. China
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6
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Xin M, Ji X, De La Cruz LK, Thareja S, Wang B. Strategies to target the Hedgehog signaling pathway for cancer therapy. Med Res Rev 2018; 38:870-913. [PMID: 29315702 DOI: 10.1002/med.21482] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 11/09/2017] [Accepted: 12/13/2017] [Indexed: 01/10/2023]
Abstract
Hedgehog (Hh) signaling is an essential pathway in the human body, and plays a major role in embryo development and tissue patterning. Constitutive activation of the Hh signaling pathway through sporadic mutations or other mechanisms is explicitly associated with cancer development and progression in various solid malignancies. Therefore, targeted inhibition of the Hh signaling pathway has emerged as an attractive and validated therapeutic strategy for the treatment of a wide range of cancers. Vismodegib, a first-in-class Hh signaling pathway inhibitor was approved by the US Food and Drug Administration in 2012, and sonidegib, another potent Hh pathway inhibitor, received FDA's approval in 2015 as a new treatment of locally advanced or metastatic basal cell carcinoma. The clinical success of vismodegib and sonidegib provided strong support for the development of Hh signaling pathway inhibitors via targeting the smoothened (Smo) receptor. Moreover, Hh signaling pathway inhibitors aimed to target proteins, which are downstream or upstream of Smo, have also been pursued based on the identification of additional therapeutic benefits. Recently, much progress has been made in Hh singling and inhibitors of this pathway. Herein, medicinal chemistry strategies, especially the structural optimization process of different classes of Hh inhibitors, are comprehensively summarized. Further therapeutic potentials and challenges are also discussed.
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Affiliation(s)
- Minhang Xin
- Department of Medicinal Chemistry, School of Pharmacy, Health Science Center, Xi'an Jiaotong University, 710061, Xi'an, Shaanxi, P.R. China.,Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, USA
| | - Xinyue Ji
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, USA
| | - Ladie Kimberly De La Cruz
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, USA
| | - Suresh Thareja
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, USA
| | - Binghe Wang
- Department of Chemistry and Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, USA
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7
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Jiang Y, Li X, Li X, Sun Y, Zhao Y, Jia S, Guo N, Xu G, Zhang W. Copper(II) Acetylacetonate: An Efficient Catalyst for Huisgen-Click Reaction for Synthesis of 1,2,3-Triazoles in Water. CHINESE J CHEM 2017. [DOI: 10.1002/cjoc.201700007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yuqin Jiang
- Henan Engineering Laboratory of Chemical Pharmaceuticals & Biomedical Materials, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering; Henan Normal University; Xinxiang Henan 453007 China
| | - Xingfeng Li
- Henan Engineering Laboratory of Chemical Pharmaceuticals & Biomedical Materials, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering; Henan Normal University; Xinxiang Henan 453007 China
| | - Xiyong Li
- Weihai Ocean Vocational College; Weihai Shandong 264300 China
| | - Yamin Sun
- Weihai Ocean Vocational College; Weihai Shandong 264300 China
| | - Yaru Zhao
- Henan Engineering Laboratory of Chemical Pharmaceuticals & Biomedical Materials, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering; Henan Normal University; Xinxiang Henan 453007 China
| | - Shuhong Jia
- Henan Engineering Laboratory of Chemical Pharmaceuticals & Biomedical Materials, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering; Henan Normal University; Xinxiang Henan 453007 China
| | - Niu Guo
- Henan Engineering Laboratory of Chemical Pharmaceuticals & Biomedical Materials, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering; Henan Normal University; Xinxiang Henan 453007 China
| | - Guiqing Xu
- Henan Engineering Laboratory of Chemical Pharmaceuticals & Biomedical Materials, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering; Henan Normal University; Xinxiang Henan 453007 China
| | - Weiwei Zhang
- Henan Engineering Laboratory of Chemical Pharmaceuticals & Biomedical Materials, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering; Henan Normal University; Xinxiang Henan 453007 China
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8
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Khatra H, Kundu J, Khan PP, Duttagupta I, Pattanayak S, Sinha S. Piperazic acid derivatives inhibit Gli1 in Hedgehog signaling pathway. Bioorg Med Chem Lett 2016; 26:4423-4426. [DOI: 10.1016/j.bmcl.2016.08.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 08/01/2016] [Accepted: 08/03/2016] [Indexed: 01/13/2023]
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9
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Yu W, Jiang L, Shen C, Zhang P. Synthesis and Biological Evaluation of Novel Carbohydrate-Derived Derivatives of Erlotinib. Drug Dev Res 2016; 77:319-25. [DOI: 10.1002/ddr.21328] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 07/26/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Wenbo Yu
- College of Pharmaceutical Sciences, Zhejiang University of Technology; Hangzhou 310014 China
- Linjiang College, Hangzhou Vocational and Technical College; Hangzhou 310018 China
| | - Luxia Jiang
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University; Hangzhou 310016 China
| | - Chao Shen
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University; Hangzhou 310016 China
| | - Pengfei Zhang
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University; Hangzhou 310016 China
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10
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Kacprzak K, Skiera I, Piasecka M, Paryzek Z. Alkaloids and Isoprenoids Modification by Copper(I)-Catalyzed Huisgen 1,3-Dipolar Cycloaddition (Click Chemistry): Toward New Functions and Molecular Architectures. Chem Rev 2016; 116:5689-743. [DOI: 10.1021/acs.chemrev.5b00302] [Citation(s) in RCA: 176] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Karol Kacprzak
- Bioorganic Chemistry Department, Faculty of Chemistry, Adam Mickiewicz University, Ul. Umultowska 89b, 61-614 Poznań, Poland
| | - Iwona Skiera
- Bioorganic Chemistry Department, Faculty of Chemistry, Adam Mickiewicz University, Ul. Umultowska 89b, 61-614 Poznań, Poland
| | - Monika Piasecka
- Bioorganic Chemistry Department, Faculty of Chemistry, Adam Mickiewicz University, Ul. Umultowska 89b, 61-614 Poznań, Poland
| | - Zdzisław Paryzek
- Bioorganic Chemistry Department, Faculty of Chemistry, Adam Mickiewicz University, Ul. Umultowska 89b, 61-614 Poznań, Poland
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11
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Rimkus TK, Carpenter RL, Qasem S, Chan M, Lo HW. Targeting the Sonic Hedgehog Signaling Pathway: Review of Smoothened and GLI Inhibitors. Cancers (Basel) 2016; 8:cancers8020022. [PMID: 26891329 PMCID: PMC4773745 DOI: 10.3390/cancers8020022] [Citation(s) in RCA: 409] [Impact Index Per Article: 51.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 01/25/2016] [Accepted: 02/05/2016] [Indexed: 12/25/2022] Open
Abstract
The sonic hedgehog (Shh) signaling pathway is a major regulator of cell differentiation, cell proliferation, and tissue polarity. Aberrant activation of the Shh pathway has been shown in a variety of human cancers, including, basal cell carcinoma, malignant gliomas, medulloblastoma, leukemias, and cancers of the breast, lung, pancreas, and prostate. Tumorigenesis, tumor progression and therapeutic response have all been shown to be impacted by the Shh signaling pathway. Downstream effectors of the Shh pathway include smoothened (SMO) and glioma-associated oncogene homolog (GLI) family of zinc finger transcription factors. Both are regarded as important targets for cancer therapeutics. While most efforts have been devoted towards pharmacologically targeting SMO, developing GLI-targeted approach has its merit because of the fact that GLI proteins can be activated by both Shh ligand-dependent and -independent mechanisms. To date, two SMO inhibitors (LDE225/Sonidegib and GDC-0449/Vismodegib) have received FDA approval for treating basal cell carcinoma while many clinical trials are being conducted to evaluate the efficacy of this exciting class of targeted therapy in a variety of cancers. In this review, we provide an overview of the biology of the Shh pathway and then detail the current landscape of the Shh-SMO-GLI pathway inhibitors including those in preclinical studies and clinical trials.
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Affiliation(s)
- Tadas K Rimkus
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
| | - Richard L Carpenter
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
| | - Shadi Qasem
- Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
- Comprehensive Cancer Center, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
| | - Michael Chan
- Comprehensive Cancer Center, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
- Department of Radiation Oncology, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
| | - Hui-Wen Lo
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
- Comprehensive Cancer Center, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
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12
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Tiwari VK, Mishra BB, Mishra KB, Mishra N, Singh AS, Chen X. Cu-Catalyzed Click Reaction in Carbohydrate Chemistry. Chem Rev 2016; 116:3086-240. [PMID: 26796328 DOI: 10.1021/acs.chemrev.5b00408] [Citation(s) in RCA: 539] [Impact Index Per Article: 67.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Cu(I)-catalyzed azide-alkyne 1,3-dipolar cycloaddition (CuAAC), popularly known as the "click reaction", serves as the most potent and highly dependable tool for facile construction of simple to complex architectures at the molecular level. Click-knitted threads of two exclusively different molecular entities have created some really interesting structures for more than 15 years with a broad spectrum of applicability, including in the fascinating fields of synthetic chemistry, medicinal science, biochemistry, pharmacology, material science, and catalysis. The unique properties of the carbohydrate moiety and the advantages of highly chemo- and regioselective click chemistry, such as mild reaction conditions, efficient performance with a wide range of solvents, and compatibility with different functionalities, together produce miraculous neoglycoconjugates and neoglycopolymers with various synthetic, biological, and pharmaceutical applications. In this review we highlight the successful advancement of Cu(I)-catalyzed click chemistry in glycoscience and its applications as well as future scope in different streams of applied sciences.
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Affiliation(s)
- Vinod K Tiwari
- Department of Chemistry, Centre of Advanced Study, Institute of Science, Banaras Hindu University , Varanasi, Uttar Pradesh-221005, India
| | - Bhuwan B Mishra
- Department of Chemistry, Centre of Advanced Study, Institute of Science, Banaras Hindu University , Varanasi, Uttar Pradesh-221005, India
| | - Kunj B Mishra
- Department of Chemistry, Centre of Advanced Study, Institute of Science, Banaras Hindu University , Varanasi, Uttar Pradesh-221005, India
| | - Nidhi Mishra
- Department of Chemistry, Centre of Advanced Study, Institute of Science, Banaras Hindu University , Varanasi, Uttar Pradesh-221005, India
| | - Anoop S Singh
- Department of Chemistry, Centre of Advanced Study, Institute of Science, Banaras Hindu University , Varanasi, Uttar Pradesh-221005, India
| | - Xi Chen
- Department of Chemistry, One Shields Avenue, University of California-Davis , Davis, California 95616, United States
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13
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Aydin T, Cakir A, Kazaz C, Bayrak N, Bayir Y, Taşkesenligil Y. Insecticidal metabolites from the rhizomes of Veratrum album against adults of Colorado potato beetle, Leptinotarsa decemlineata. Chem Biodivers 2015; 11:1192-204. [PMID: 25146763 DOI: 10.1002/cbdv.201300407] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Indexed: 11/06/2022]
Abstract
The dried rhizomes of Veratrum album were individually extracted with CHCl3 , acetone, and NH4 OH/benzene to test the toxic effects against the Colorado potato beetle, Leptinotarsa decemlineata, which is an important agricultural pest. Fifteen compounds in various amounts were isolated from the extracts using column and thin-layer chromatography. The chemical structures of 14 compounds were characterized as octacosan-1-ol (1), β-sitosterol (2), stearic acid (3), diosgenin (4), resveratrol (5), wittifuran X (6), oxyresveratrol (7), β-sitosterol 3-O-β-D-glucopyranoside (8), diosgenin 3-O-α-L-rhamnopyranosyl-(1 → 2)-β-D-glucopyronoside (9), oxyresveratrol 3-O-β-D-glucopyranoside (10), jervine (11), pseudojervine (13), 5,6-dihydro-1-hydroxyjervine (14), and saccharose (15) using UV, IR, MS, (1) H- and (13)C-NMR, and 2D-NMR spectroscopic methods. However, the chemical structure of 12, an oligosaccharide, has not fully been elucidated. Compounds 4, 6, 9, and 10 were isolated from V. album rhizomes for the first time in the current study. The toxic effects of three extracts (acetone, CHCl3 , and NH4 OH/benzene) and six metabolites, 2, 2+4, 5, 7, 8, and 11, were evaluated against the Colorado potato beetle. The assay revealed that all three extracts, and compounds 7, 8, and 11 exhibited potent toxic effects against this pest. This is the first report on the evaluation of the toxic effects of the extracts and secondary metabolites of V. album rhizomes against L. decemlineata. Based on these results, it can be concluded that the extracts can be used as natural insecticides.
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Affiliation(s)
- Tuba Aydin
- Agri İbrahim Cecen University, Health Services Vocational School, Department of Paramedic, TR-04100, Agri
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14
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Jiang QW, Chen MW, Cheng KJ, Yu PZ, Wei X, Shi Z. Therapeutic Potential of Steroidal Alkaloids in Cancer and Other Diseases. Med Res Rev 2015; 36:119-43. [PMID: 25820039 DOI: 10.1002/med.21346] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 02/15/2015] [Indexed: 02/06/2023]
Abstract
Steroidal alkaloids are a class of secondary metabolites isolated from plants, amphibians, and marine invertebrates. Evidence accumulated in the recent two decades demonstrates that steroidal alkaloids have a wide range of bioactivities including anticancer, antimicrobial, anti-inflammatory, antinociceptive, etc., suggesting their great potential for application. It is therefore necessary to comprehensively summarize the bioactivities, especially anticancer activities and mechanisms of steroidal alkaloids. Here we systematically highlight the anticancer profiles both in vitro and in vivo of steroidal alkaloids such as dendrogenin, solanidine, solasodine, tomatidine, cyclopamine, and their derivatives. Furthermore, other bioactivities of steroidal alkaloids are also discussed. The integrated molecular mechanisms in this review can increase our understanding on the utilization of steroidal alkaloids and contribute to the development of new drug candidates. Although the therapeutic potentials of steroidal alkaloids look promising in the preclinical and clinical studies, further pharmacokinetic and clinical studies are mandated to define their efficacy and safety in cancer and other diseases.
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Affiliation(s)
- Qi-Wei Jiang
- Department of Cell Biology & Institute of Biomedicine, National Engineering Research Center of Genetic Medicine, Guangdong Provincial Key Laboratory of Bioengineering Medicine, College of Life Science and Technology, Jinan University, Guangzhou, 510632, Guangdong, China
| | - Mei-Wan Chen
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, 519000, China
| | - Ke-Jun Cheng
- Chemical Biology Center, Lishui Institute of Agricultural Sciences, Lishui, 323000, Zhejiang, China
| | - Pei-Zhong Yu
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, Shanghai, 200433, China
| | - Xing Wei
- Department of Cell Biology & Institute of Biomedicine, National Engineering Research Center of Genetic Medicine, Guangdong Provincial Key Laboratory of Bioengineering Medicine, College of Life Science and Technology, Jinan University, Guangzhou, 510632, Guangdong, China
| | - Zhi Shi
- Department of Cell Biology & Institute of Biomedicine, National Engineering Research Center of Genetic Medicine, Guangdong Provincial Key Laboratory of Bioengineering Medicine, College of Life Science and Technology, Jinan University, Guangzhou, 510632, Guangdong, China
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15
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'Click chemistry' synthesis of 1-(α-D-mannopyranosyl)-1,2,3-triazoles for inhibition of α-mannosidases. Carbohydr Res 2015; 406:34-40. [PMID: 25658064 DOI: 10.1016/j.carres.2015.01.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 01/09/2015] [Accepted: 01/11/2015] [Indexed: 12/14/2022]
Abstract
Three new triazole conjugates derived from d-mannose were synthesized and assayed in in vitro assays to investigate their ability to inhibit α-mannosidase enzymes from the glycoside hydrolase (GH) families 38 and 47. The triazole conjugates were more selective for a GH47 α-mannosidase (Aspergillus saitoi α1,2-mannosidase), showing inhibition at the micromolar level (IC50 values of 50-250 μM), and less potent towards GH38 mannosidases (IC50 values in the range of 0.5-6 mM towards jack bean α-mannosidase or Drosophila melanogaster lysosomal and Golgi α-mannosidases). The highest selectivity ratio [IC50(GH38)/IC50(GH47)] of 100 was exhibited by the phenyltriazole conjugate. To understand structure-activity properties of synthesized compounds, 3-D complexes of inhibitors with α-mannosidases were built using molecular docking calculations.
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16
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Kamal A, Hussaini SMA, Sucharitha ML, Poornachandra Y, Sultana F, Ganesh Kumar C. Synthesis and antimicrobial potential of nitrofuran–triazole congeners. Org Biomol Chem 2015; 13:9388-97. [DOI: 10.1039/c5ob01353d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A series of nitrofuran-triazole congeners were synthesized that displayed excellent to appreciable antimicrobial and antibiofilm activities. Compound 9f inhibited CYP51, an enzyme involved in ergosterol biosynthesis in fungi.
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Affiliation(s)
- Ahmed Kamal
- Medicinal Chemistry & Pharmacology
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500 007
- India
- Department of Medicinal Chemistry
| | - S. M. Ali Hussaini
- Medicinal Chemistry & Pharmacology
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500 007
- India
| | - M. Lakshmi Sucharitha
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Hyderabad 500 037
- India
| | - Y. Poornachandra
- Medicinal Chemistry & Pharmacology
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500 007
- India
| | - Faria Sultana
- Medicinal Chemistry & Pharmacology
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500 007
- India
| | - C. Ganesh Kumar
- Medicinal Chemistry & Pharmacology
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500 007
- India
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17
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Collins I, Jones AM. Diversity-oriented synthetic strategies applied to cancer chemical biology and drug discovery. Molecules 2014; 19:17221-55. [PMID: 25350364 PMCID: PMC6270883 DOI: 10.3390/molecules191117221] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 10/13/2014] [Accepted: 10/17/2014] [Indexed: 12/22/2022] Open
Abstract
How can diversity-oriented strategies for chemical synthesis provide chemical tools to help shape our understanding of complex cancer pathways and progress anti-cancer drug discovery efforts? This review (surveying the literature from 2003 to the present) considers the applications of diversity-oriented synthesis (DOS), biology-oriented synthesis (BIOS) and associated strategies to cancer biology and drug discovery, summarising the syntheses of novel and often highly complex scaffolds from pluripotent or synthetically versatile building blocks. We highlight the role of diversity-oriented synthetic strategies in producing new chemical tools to interrogate cancer biology pathways through the assembly of relevant libraries and their application to phenotypic and biochemical screens. The use of diversity-oriented strategies to explore structure-activity relationships in more advanced drug discovery projects is discussed. We show how considering appropriate and variable focus in library design has provided a spectrum of DOS approaches relevant at all stages in anti-cancer drug discovery.
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Affiliation(s)
- Ian Collins
- Cancer Research UK Cancer Therapeutics Unit, The Institute of Cancer Research, London SM2 5NG, UK.
| | - Alan M Jones
- Division of Chemistry and Environmental Science, School of Science and the Environment, Faculty of Science and Engineering, Manchester Metropolitan University, John Dalton Building, Chester Street, Manchester M1 5GD, UK.
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18
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Chandler CM, McDougal OM. Medicinal history of North American Veratrum.. PHYTOCHEMISTRY REVIEWS : PROCEEDINGS OF THE PHYTOCHEMICAL SOCIETY OF EUROPE 2014; 13:671-694. [PMID: 25379034 PMCID: PMC4217314 DOI: 10.1007/s11101-013-9328-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Plants belonging to the genus Veratrum have been used throughout history for their medicinal properties. During the nineteenth and twentieth centuries, phytochemical investigations revealed a host of steroidal alkaloids in Veratrum species, some of which are potent bioactives. This review discusses Veratrum species that grow in North America with a focus on the medicinal history of these plants and the steroidal alkaloids they contain. While significant reviews have been devoted to singularly describing the plant species within the genus Veratrum (botany), the staggering breadth of alkaloids isolated from these and related plants (phytochemistry), and the intricacies of how the various alkaloids act on their biological targets (physiology and biochemistry), this review will straddle the margins of the aforementioned disciplines in an attempt to provide a unified, coherent picture of the Veratrum plants of North America and the medicinal uses of their bioactive steroidal alkaloids.
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Affiliation(s)
- Christopher M. Chandler
- Department of Chemistry and Biochemistry, Boise State, University, 1910 University Drive, Boise, ID 83725-1520, USA
| | - Owen M. McDougal
- Department of Chemistry and Biochemistry, Boise State, University, 1910 University Drive, Boise, ID 83725-1520, USA
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19
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Lee ST, Welch KD, Panter KE, Gardner DR, Garrossian M, Chang CWT. Cyclopamine: from cyclops lambs to cancer treatment. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:7355-7362. [PMID: 24754790 DOI: 10.1021/jf5005622] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In the late 1960s, the steroidal alkaloid cyclopamine was isolated from the plant Veratrum californicum and identified as the teratogen responsible for craniofacial birth defects including cyclops in the offspring of sheep grazing on mountain ranges in the western United States. Cyclopamine was found to inhibit the hedgehog (Hh) signaling pathway, which plays a critical role in embryonic development. More recently, aberrant Hh signaling has been implicated in several types of cancer. Thus, inhibitors of the Hh signaling pathway, including cyclopamine derivatives, have been targeted as potential treatments for certain cancers and other diseases associated with the Hh signaling pathway. A brief history of cyclopamine and cyclopamine derivatives investigated for the treatment of cancer is presented.
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Affiliation(s)
- Stephen T Lee
- Poisonous Plant Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, 1150 East 1400 North, Logan, Utah 84341, United States
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20
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Banerjee U, Hadden MK. Recent advances in the design of Hedgehog pathway inhibitors for the treatment of malignancies. Expert Opin Drug Discov 2014; 9:751-71. [PMID: 24850423 DOI: 10.1517/17460441.2014.920817] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
INTRODUCTION The Hedgehog (Hh) signaling pathway is known to be dysregulated in several forms of cancer. Hence, specifically targeting this signaling cascade is a valid and promising strategy for successful therapeutic intervention. Several components within the Hh pathway have been proven to be druggable; however, challenges in the discovery and development process for small molecules targeting this pathway have been identified. AREAS COVERED This review details both the current state and future potential of Hh pathway inhibitors as anticancer chemotherapeutics that target a variety of human malignancies. EXPERT OPINION The initial development of Hh pathway inhibitors focused on small-molecule antagonists of Smoothened, a transmembrane protein that is a key regulator of pathway signaling. More recently, efforts to identify and develop inhibitors of pathway signaling that function through alternate mechanisms have been increasing. However, none of these have advanced into clinical trials. Further, early evidence suggesting the broad application of Hh pathway inhibitors as a monotherapy in a wide range of human cancers has not been validated. The potential for Hh pathway inhibitors as combination therapy has demonstrated promising preclinical results. However, more research to identify rational drug combinations to fully explore the potential of this anticancer drug class is warranted.
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Affiliation(s)
- Upasana Banerjee
- University of Connecticut, Department of Pharmaceutical Sciences , 69 N Eagleville Rd, Unit 3092, Storrs, CT 06269-3092 , USA +1 860 486 8446 ;
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21
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Cragg GM, Grothaus PG, Newman DJ. New horizons for old drugs and drug leads. JOURNAL OF NATURAL PRODUCTS 2014; 77:703-23. [PMID: 24499205 DOI: 10.1021/np5000796] [Citation(s) in RCA: 170] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
There is mounting urgency to find new drugs for the treatment of serious infectious diseases and cancer that are rapidly developing resistance to previously effective drugs. One approach to addressing this need is through drug repurposing, which refers to the discovery of new useful activities for "old" clinically used drugs through screening them against relevant disease targets. A large number of potential drug that, for various reasons, have failed to advance to clinical and commercial use can be added to the candidates available for such purposes. The application of new techniques and methodology developed through the impressive progress made in multidisciplinary, natural product-related research in recent years should aid substantially in expediting the discovery and development process. This review briefly outlines some of these developments as applied to a number of selected natural product examples, which may also include advances in chemical synthesis of derivatives with extended biological activities.
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Affiliation(s)
- Gordon M Cragg
- Natural Products Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, Frederick National Laboratory , P.O. Box B, Frederick, Maryland 21702, United States
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22
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Anti-tubercular agents. Part 8: Synthesis, antibacterial and antitubercular activity of 5-nitrofuran based 1,2,3-triazoles. Bioorg Med Chem Lett 2013; 23:6842-6. [DOI: 10.1016/j.bmcl.2013.10.010] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Revised: 09/18/2013] [Accepted: 10/04/2013] [Indexed: 12/22/2022]
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23
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Synthesis and biological activity of novel 1-substituted phenyl(glycosyl)-4-{4-[4,6-dimethoxy)pyrimidin-2-yl] piperazin-1-yl}methyl-1H-1,2,3-triazoles. Chem Res Chin Univ 2013. [DOI: 10.1007/s40242-013-2338-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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24
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Thirumurugan P, Matosiuk D, Jozwiak K. Click Chemistry for Drug Development and Diverse Chemical–Biology Applications. Chem Rev 2013; 113:4905-79. [DOI: 10.1021/cr200409f] [Citation(s) in RCA: 1309] [Impact Index Per Article: 119.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Prakasam Thirumurugan
- Laboratory
of Medical Chemistry and Neuroengineering, Department of Chemistry, and ‡Department of
Synthesis and Chemical Technology of Pharmaceutical Substances, Medical University of Lublin, Lublin
20093, Poland
| | - Dariusz Matosiuk
- Laboratory
of Medical Chemistry and Neuroengineering, Department of Chemistry, and ‡Department of
Synthesis and Chemical Technology of Pharmaceutical Substances, Medical University of Lublin, Lublin
20093, Poland
| | - Krzysztof Jozwiak
- Laboratory
of Medical Chemistry and Neuroengineering, Department of Chemistry, and ‡Department of
Synthesis and Chemical Technology of Pharmaceutical Substances, Medical University of Lublin, Lublin
20093, Poland
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25
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Pérez-Labrada K, Morera C, Brouard I, Llerena R, Rivera DG. Synthesis and conformational study of triazole-linked bis-spirostanic conjugates. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.01.058] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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26
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Stulov SV, Misharin AY. Synthesis of steroids with nitrogen-containing substituents in ring D (Review). Chem Heterocycl Compd (N Y) 2013. [DOI: 10.1007/s10593-013-1158-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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28
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Lee ST, Panter KE, Gardner DR, Green BT, Welch KD, Zhang J, Chang CWT. Development of a monoclonal antibody-based ELISA for the hedgehog inhibitors cyclopamine and KAAD-cyclopamine. J Pharm Biomed Anal 2012; 66:282-6. [DOI: 10.1016/j.jpba.2012.03.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Revised: 03/19/2012] [Accepted: 03/20/2012] [Indexed: 11/25/2022]
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Abstract
The Veratrum alkaloid cyclopamine, an inhibitor of cancer stem cell growth, was used as a representative scaffold to evaluate the inhibitory impact of glycosylation with a group of nonmetabolic saccharides, such as d-threose. In a five-step divergent process, a 32-member glycoside library was created and assayed to determine that glycosides of such sugars notably improved the GI50 value of cyclopamine while metabolic sugars, such as d-glucose, did not.
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30
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Rivera DG, Pérez-Labrada K, Lambert L, Dörner S, Westermann B, Wessjohann LA. Carbohydrate-steroid conjugation by Ugi reaction: one-pot synthesis of triple sugar/pseudo-peptide/spirostane hybrids. Carbohydr Res 2012; 359:102-10. [PMID: 22925772 DOI: 10.1016/j.carres.2012.05.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Revised: 05/03/2012] [Accepted: 05/03/2012] [Indexed: 11/16/2022]
Abstract
The one-pot synthesis of novel molecular chimeras incorporating sugar, pseudo-peptide, and steroidal moieties is described. For this, a new carbohydrate-steroid conjugation approach based on the Ugi four-component reaction was implemented for the ligation of glucose and chacotriose to spirostanic steroids. The approach proved wide substrate scope, as both mono and oligosaccharides functionalized with amino, carboxy, and isocyano groups were conjugated to steroidal substrates in an efficient, multicomponent manner. Two alternative strategies based on the hydrazoic acid variant of the Ugi reaction were employed for the synthesis of tetrazole-based chacotriose-diosgenin conjugates resembling naturally occurring spirostan saponins. This is the first time that triple sugar/pseudo-peptide/steroid hybrids are produced, thus opening up an avenue of opportunities for applications in drug discovery and biological chemistry.
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Affiliation(s)
- Daniel G Rivera
- Center for Natural Products Study, Faculty of Chemistry, University of Havana, La Habana, Cuba.
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31
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Abstract
A Veratrum piperidine chiron was prepared over 11 steps (7.9% yield) from (-)-citronellal. Three methods for the installation of the propargylic side chain onto a cyclic enamide are presented.
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Affiliation(s)
- Douglass F Taber
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
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32
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Pérez-Labrada K, Brouard I, Morera C, Estévez F, Bermejo J, Rivera DG. ‘Click’ synthesis of triazole-based spirostan saponin analogs. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.08.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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33
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Zhu R, Liu Q, Tang J, Li H, Cao Z. Investigations on inhibitors of hedgehog signal pathway: a quantitative structure-activity relationship study. Int J Mol Sci 2011; 12:3018-33. [PMID: 21686166 PMCID: PMC3116172 DOI: 10.3390/ijms12053018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Revised: 04/20/2011] [Accepted: 04/28/2011] [Indexed: 12/30/2022] Open
Abstract
The hedgehog signal pathway is an essential agent in developmental patterning, wherein the local concentration of the Hedgehog morphogens directs cellular differentiation and expansion. Furthermore, the Hedgehog pathway has been implicated in tumor/stromal interaction and cancer stem cell. Nowadays searching novel inhibitors for Hedgehog Signal Pathway is drawing much more attention by biological, chemical and pharmological scientists. In our study, a solid computational model is proposed which incorporates various statistical analysis methods to perform a Quantitative Structure-Activity Relationship (QSAR) study on the inhibitors of Hedgehog signaling. The whole QSAR data contain 93 cyclopamine derivatives as well as their activities against four different cell lines (NCI-H446, BxPC-3, SW1990 and NCI-H157). Our extensive testing indicated that the binary classification model is a better choice for building the QSAR model of inhibitors of Hedgehog signaling compared with other statistical methods and the corresponding in silico analysis provides three possible ways to improve the activity of inhibitors by demethylation, methylation and hydroxylation at specific positions of the compound scaffold respectively. From these, demethylation is the best choice for inhibitor structure modifications. Our investigation also revealed that NCI-H466 served as the best cell line for testing the activities of inhibitors of Hedgehog signal pathway among others.
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Affiliation(s)
- Ruixin Zhu
- Department of Bioinformatics, School of Life Sciences and Technology, Tongji University, 1239 Siping Road, Shanghai 200092, China; E-Mails: (R.Z.); (Q.L.)
| | - Qi Liu
- Department of Bioinformatics, School of Life Sciences and Technology, Tongji University, 1239 Siping Road, Shanghai 200092, China; E-Mails: (R.Z.); (Q.L.)
| | - Jian Tang
- Department of Natural Medicinal Chemistry, School of Pharmacy, Second Military Medical University, Shanghai 200433, China; E-Mail:
| | - Huiliang Li
- Department of Natural Medicinal Chemistry, School of Pharmacy, Second Military Medical University, Shanghai 200433, China; E-Mail:
| | - Zhiwei Cao
- Department of Bioinformatics, School of Life Sciences and Technology, Tongji University, 1239 Siping Road, Shanghai 200092, China; E-Mails: (R.Z.); (Q.L.)
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34
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Gautier FM, Djedaïni-Pilard F, Grandjean C. The iodosulfonamidation of peracetylated glycals revisited: access to 1,2-di-nitrogenated sugars. Carbohydr Res 2011; 346:577-87. [DOI: 10.1016/j.carres.2011.01.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2010] [Revised: 01/17/2011] [Accepted: 01/20/2011] [Indexed: 01/21/2023]
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35
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Yan SJ, Liu YJ, Chen YL, Liu L, Lin J. An efficient one-pot synthesis of heterocycle-fused 1,2,3-triazole derivatives as anti-cancer agents. Bioorg Med Chem Lett 2010; 20:5225-8. [DOI: 10.1016/j.bmcl.2010.06.141] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2010] [Revised: 06/12/2010] [Accepted: 06/30/2010] [Indexed: 11/27/2022]
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36
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Heretsch P, Tzagkaroulaki L, Giannis A. Cyclopamine and hedgehog signaling: chemistry, biology, medical perspectives. Angew Chem Int Ed Engl 2010; 49:3418-27. [PMID: 20429080 DOI: 10.1002/anie.200906967] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
When Odysseus left the devastated city of Troy after ten years of siege he could not foresee the perils he still had to face. The encounter with the cyclops, a giant with only one eye placed in the middle of its forehead, was doubtlessly one of the creepiest and most dangerous of his adventures. In the end, Odysseus could only escape with the help of a sheep. Whether Homers cyclops was inspired by the observation of terribly malformed neonates remains speculative. However, when sheep herders in Idaho in the middle of the 20th century faced an increasing number of cyclops-like sheep in their herds, a unique cascade of chemical, biological, and medicinal discoveries was initiated. This Minireview tells this story and shows its impact on modern biomedical research.
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Affiliation(s)
- Philipp Heretsch
- Institut für Organische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
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37
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Witczak ZJ. Recent advances in the synthesis of functionalized carbohydrate azides. CARBOHYDRATE CHEMISTRY 2010. [DOI: 10.1039/9781849730891-00176] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Zbigniew J. Witczak
- Department of Pharmaceutical Sciences, Nesbitt School of Pharmacy, Wilkes University Wilkes-Barre, 84 W. South Street 18766 Pennsylvania U.S.A
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38
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Singh N, Pandey SK, Tripathi RP. Regioselective [3+2] cycloaddition of chalcones with a sugar azide: easy access to 1-(5-deoxy-D-xylofuranos-5-yl)-4,5-disubstituted-1H-1,2,3-triazoles. Carbohydr Res 2010; 345:1641-8. [PMID: 20579636 DOI: 10.1016/j.carres.2010.04.019] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2010] [Revised: 04/15/2010] [Accepted: 04/21/2010] [Indexed: 11/18/2022]
Abstract
[3+2] Cycloaddition of 5-azido-5-deoxy-1,2-O-isopropylidene-alpha-d-xylofuranose with 1,3-diphenyl-prop-3-enones, followed by oxidation of the intermediate triazolines in a tandem manner, led to the regioselective formation of 4-benzoyl-1-(5-deoxy-1,2-O-isopropylidene-alpha-d-xylofuranos-5-yl)-5-phenyl-1H-1,2,3-triazoles in moderate to good yields.
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Affiliation(s)
- Nimisha Singh
- Medicinal and Process Chemistry Division, Central Drug Research Institute, Lucknow 226 001, CSIR, India
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39
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Mas C, Ruiz i Altaba A. Small molecule modulation of HH-GLI signaling: current leads, trials and tribulations. Biochem Pharmacol 2010; 80:712-23. [PMID: 20412786 DOI: 10.1016/j.bcp.2010.04.016] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2010] [Revised: 04/12/2010] [Accepted: 04/13/2010] [Indexed: 01/07/2023]
Abstract
Many human sporadic cancers have been recently shown to require the activity of the Hedgehog-GLI pathway for sustained growth. The survival and expansion of cancer stem cells is also HH-GLI dependent. Here we review the advances on the modulation of HH-GLI signaling by small molecules. We focus on both natural compounds and synthetic molecules that target upstream pathway components, mostly SMOOTHENED, and those that target the last steps of the pathway, the GLI transcription factors. In this review we have sought to provide some bases for useful comparisons, listing original assays used and sources to facilitate comparisons of IC50 values. This area is a rapidly expanding field where biology, medicine and chemistry intersect, both in academia and industry. We also highlight current clinical trials, with positive results in early stages. While we have tried to be exhaustive regarding the molecules, not all data is in the public domain yet. Indeed, we have opted to avoid listing chemical structures but these can be easily found in the references given. Finally, we are hopeful that the best molecules will soon reach the patients but caution about the lack of investment on compounds that lack tight IP positions. While the market in developed nations is expected to compensate the investment and risk of making HH-GLI modulators, other sources or plans must be available for developing nations and poor patient populations. The promise of curing cancer recalls the once revered dream of El Dorado, which taught us that not everything that GLI-tters is gold.
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Affiliation(s)
- Christophe Mas
- Department of Genetic Medicine and Development, University of Geneva Medical School, 1 rue Michel Servet, CH-1211 Geneva, Switzerland.
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Heretsch P, Tzagkaroulaki L, Giannis A. Cyclopamin und der Hedgehog-Signaltransduktionsweg: Chemie, Biologie, medizinische Perspektiven. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200906967] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Synthesis of 1-(d-glucopyranosyl)-1,2,3-triazoles and their evaluation as glycogen phosphorylase inhibitors. Bioorg Med Chem 2010; 18:1171-80. [DOI: 10.1016/j.bmc.2009.12.043] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2009] [Revised: 12/09/2009] [Accepted: 12/15/2009] [Indexed: 11/23/2022]
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Tremblay MR, Lescarbeau A, Grogan MJ, Tan E, Lin G, Austad BC, Yu LC, Behnke ML, Nair SJ, Hagel M, White K, Conley J, Manna JD, Alvarez-Diez TM, Hoyt J, Woodward CN, Sydor JR, Pink M, MacDougall J, Campbell MJ, Cushing J, Ferguson J, Curtis MS, McGovern K, Read MA, Palombella VJ, Adams J, Castro AC. Discovery of a potent and orally active hedgehog pathway antagonist (IPI-926). J Med Chem 2009; 52:4400-18. [PMID: 19522463 DOI: 10.1021/jm900305z] [Citation(s) in RCA: 191] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Recent evidence suggests that blocking aberrant hedgehog pathway signaling may be a promising therapeutic strategy for the treatment of several types of cancer. Cyclopamine, a plant Veratrum alkaloid, is a natural product antagonist of the hedgehog pathway. In a previous report, a seven-membered D-ring semisynthetic analogue of cyclopamine, IPI-269609 (2), was shown to have greater acid stability and better aqueous solubility compared to cyclopamine. Further modifications of the A-ring system generated three series of analogues with improved potency and/or solubility. Lead compounds from each series were characterized in vitro and evaluated in vivo for biological activity and pharmacokinetic properties. These studies led to the discovery of IPI-926 (compound 28), a novel semisynthetic cyclopamine analogue with substantially improved pharmaceutical properties and potency and a favorable pharmacokinetic profile relative to cyclopamine and compound 2. As a result, complete tumor regression was observed in a Hh-dependent medulloblastoma allograft model after daily oral administration of 40 mg/kg of compound 28.
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Mahindroo N, Punchihewa C, Fujii N. Hedgehog-Gli signaling pathway inhibitors as anticancer agents. J Med Chem 2009; 52:3829-45. [PMID: 19309080 DOI: 10.1021/jm801420y] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Neeraj Mahindroo
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.
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Li HY, Xu W, Li HL, Zhang WD, Hu LW. LC-MS-MS Method for the Determination of Protoveratrine A in Rat Plasma. Chromatographia 2009. [DOI: 10.1365/s10337-008-0936-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Robert S, Raikhel NV, Hicks GR. Powerful partners: Arabidopsis and chemical genomics. THE ARABIDOPSIS BOOK 2009; 7:e0109. [PMID: 22303245 PMCID: PMC3243329 DOI: 10.1199/tab.0109] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Chemical genomics (i.e. genomics scale chemical genetics) approaches capitalize on the ability of low molecular mass molecules to modify biological processes. Such molecules are used to modify the activity of a protein or a pathway in a manner that it is tunable and reversible. Bioactive chemicals resulting from forward or reverse chemical screens can be useful in understanding and dissecting complex biological processes due to the essentially limitless variation in structure and activities inherent in chemical space. A major advantage of this approach as a powerful addition to conventional plant genetics is the fact that chemical genomics can address loss-of-function lethality and redundancy. Furthermore, the ability of chemicals to be added at will and to act quickly can permit the study of processes that are highly dynamic such as endomembrane trafficking. An important aspect of utilizing small molecules effectively is to characterize bioactive chemicals in detail including an understanding of structure-activity relationships and the identification of active and inactive analogs. Bioactive chemicals can be useful as reagents to probe biological pathways directly. However, the identification of cognate targets and their pathways is also informative and can be achieved by screens for genetic resistance or hypersensitivity in Arabidopsis thaliana or other organisms from which the results can be translated to plants. In addition, there are approaches utilizing "tagged" chemical libraries that possess reactive moieties permitting the immobilization of active compounds. This opens the possibility for biochemical purification of putative cognate targets. We will review approaches to screen for bioactive chemicals that affect biological processes in Arabidopsis and provide several examples of the power and challenges inherent in this new approach in plant biology.
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Affiliation(s)
- Stéphanie Robert
- Center for Plant Cell Biology & Department of Botany and Plant Sciences, University of California, Riverside, CA 92521
- Current address: VIB Department of Plant Systems Biology, University of Ghent, 9052 Ghent, Belgium
| | - Natasha V. Raikhel
- Center for Plant Cell Biology & Department of Botany and Plant Sciences, University of California, Riverside, CA 92521
| | - Glenn R. Hicks
- Center for Plant Cell Biology & Department of Botany and Plant Sciences, University of California, Riverside, CA 92521
- Address correspondence to
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Zhang J, Chang CWT. Divergent Synthesis of Three Classes of Aryl N-Glycosides by Solvent Control. J Org Chem 2008; 74:685-95. [DOI: 10.1021/jo8020133] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jianjun Zhang
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, Utah 84322-0300
| | - Cheng-Wei Tom Chang
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, Utah 84322-0300
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Tremblay MR, Nevalainen M, Nair SJ, Porter JR, Castro AC, Behnke ML, Yu LC, Hagel M, White K, Faia K, Grenier L, Campbell MJ, Cushing J, Woodward CN, Hoyt J, Foley MA, Read MA, Sydor JR, Tong JK, Palombella VJ, McGovern K, Adams J. Semisynthetic Cyclopamine Analogues as Potent and Orally Bioavailable Hedgehog Pathway Antagonists. J Med Chem 2008; 51:6646-9. [DOI: 10.1021/jm8008508] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Martin R. Tremblay
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Marta Nevalainen
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Somarajan J. Nair
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - James R. Porter
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Alfredo C. Castro
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Mark L. Behnke
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Lin-Chen Yu
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Margit Hagel
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Kerry White
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Kerrie Faia
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Louis Grenier
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Matthew J. Campbell
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Jill Cushing
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Caroline N. Woodward
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Jennifer Hoyt
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Michael A. Foley
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Margaret A. Read
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Jens R. Sydor
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Jeffrey K. Tong
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Vito J. Palombella
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Karen McGovern
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
| | - Julian Adams
- Infinity Pharmaceuticals, Inc., 780 Memorial Drive, Cambridge, Massachusetts 02139
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Oatis JE, Brunsfeld P, Rushing JW, Moeller PD, Bearden DW, Gallien TN, Cooper G. Isolation, purification, and full NMR assignments of cyclopamine from Veratrum californicum. Chem Cent J 2008; 2:12. [PMID: 18577213 PMCID: PMC2442831 DOI: 10.1186/1752-153x-2-12] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2008] [Accepted: 06/24/2008] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The Hedgehog signaling pathway is essential for embryogenesis and for tissue homeostasis in the adult. However, it may induce malignancies in a number of tissues when constitutively activated, and it may also have a role in other forms of normal and maladaptive growth. Cyclopamine, a naturally occurring steroidal alkaloid, specifically inhibits the Hedgehog pathway by binding directly to Smoothened, an important Hedgehog response element. To use cyclopamine as a tool to explore and/or inhibit the Hedgehog pathway in vivo, a substantial quantity is required, and as a practical matter cyclopamine has been effectively unavailable for usage in animals larger than mice. RESULTS In this paper, we report a rapid and efficient isolation and purification of large quantities of cyclopamine from the roots and rhizomes of Veratrum californicum Dur. (the Corn Lily or Western false hellebore). We also provide unambiguous assignments of the carbon and proton resonances by using the multinuclear spectra and the spin coupling networks. CONCLUSION This method could meet a very real need within diverse scientific communities by allowing cyclopamine to become more readily available.
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Affiliation(s)
- John E Oatis
- Department of Pharmacology & Experimental Therapeutics, Medical University of South Carolina, Charleston, SC 29425 USA.
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Andrews DM, Stokes ES, Carr GR, Matusiak ZS, Roberts CA, Waring MJ, Brady MC, Chresta CM, East SJ. Design and campaign synthesis of piperidine- and thiazole-based histone deacetylase inhibitors. Bioorg Med Chem Lett 2008; 18:2580-4. [DOI: 10.1016/j.bmcl.2008.03.041] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2008] [Revised: 03/13/2008] [Accepted: 03/14/2008] [Indexed: 10/22/2022]
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