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Cherewyk JE, Grusie-Ogilvie TJ, Parker SE, Blakley BR, Al-Dissi AN. The Impact of Storage Temperature and Time on Ergot Alkaloid Concentrations. Toxins (Basel) 2023; 15:497. [PMID: 37624254 PMCID: PMC10467117 DOI: 10.3390/toxins15080497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 07/27/2023] [Accepted: 08/03/2023] [Indexed: 08/26/2023] Open
Abstract
Ergot sclerotia produce toxic secondary metabolites, ergot alkaloids, that infect cereal crops and grasses. Ergot alkaloids have two isomeric configurations: the C-8-R-isomer (R-epimer), and the C-8-S-isomer (S-epimer). Ergot contaminated matrices, such as cereal grains or grasses, may be stored for extended periods at various temperatures before being analyzed, utilized, or consumed. This study assessed the concentration of six common ergot alkaloids in both configurations found in naturally contaminated wheat over time (one, two, and four months) at different temperatures (room temperature, +4 °C, and -20 °C) using ultra-high-performance liquid chromatography-tandem mass spectrometry. The data indicate that the total ergot concentration within a natural contaminated sample varies over time at room temperature, +4 °C, and -20 °C. The total ergot concentration increased until month two, and decreased at month four, independent of temperature (p < 0.05). The total R-epimer concentration appeared to be less stable over time than the total S-epimer concentration. The changes in the total R and total S-epimer concentrations may have been caused by changes in the ergocristine and ergocristinine concentrations, respectively. Time and temperature should be considered when storing potentially contaminated matrices in a laboratory or practical agriculture situations. Quantification of ergot contaminated matrices should occur prior to their use to ensure the most reliable estimates of the concentration of ergot.
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Affiliation(s)
- Jensen E. Cherewyk
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK S7N 5B4, Canada;
| | | | - Sarah E. Parker
- Centre for Applied Epidemiology, Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK S7N 5B4, Canada;
| | - Barry R. Blakley
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK S7N 5B4, Canada;
| | - Ahmad N. Al-Dissi
- Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK S7N 5B4, Canada;
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Shin HJ, Lee MA, Lee HS, Heo CS. Thiolactones and Δ 8,9-Pregnene Steroids from the Marine-Derived Fungus Meira sp. 1210CH-42 and Their α-Glucosidase Inhibitory Activity. Mar Drugs 2023; 21:md21040246. [PMID: 37103385 PMCID: PMC10140954 DOI: 10.3390/md21040246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 04/13/2023] [Accepted: 04/14/2023] [Indexed: 04/28/2023] Open
Abstract
The fungal genus Meira was first reported in 2003 and has mostly been found on land. This is the first report of second metabolites from the marine-derived yeast-like fungus Meira sp. One new thiolactone (1), along with one revised thiolactone (2), two new Δ8,9-steroids (4, 5), and one known Δ8,9-steroid (3), were isolated from the Meira sp. 1210CH-42. Their structures were elucidated based on the comprehensive spectroscopic data analysis of 1D, 2D NMR, HR-ESIMS, ECD calculations, and the pyridine-induced deshielding effect. The structure of 5 was confirmed by oxidation of 4 to semisynthetic 5. In the α-glucosidase inhibition assay, compounds 2-4 showed potent in vitro inhibitory activity with IC50 values of 148.4, 279.7, and 86.0 μM, respectively. Compounds 2-4 exhibited superior activity as compared to acarbose (IC50 = 418.9 μM).
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Affiliation(s)
- Hee Jae Shin
- Marine Natural Products Chemistry Laboratory, Korea Institute of Ocean Science and Technology, 385 Haeyang-ro, Yeongdo-gu, Busan 49111, Republic of Korea
- Department of Marine Biotechnology, University of Science and Technology (UST), 217 Gajungro, Yuseong-gu, Daejeon 34113, Republic of Korea
| | - Min Ah Lee
- Marine Natural Products Chemistry Laboratory, Korea Institute of Ocean Science and Technology, 385 Haeyang-ro, Yeongdo-gu, Busan 49111, Republic of Korea
- Department of Chemistry, Pukyong National University, Busan 48513, Republic of Korea
| | - Hwa-Sun Lee
- Marine Natural Products Chemistry Laboratory, Korea Institute of Ocean Science and Technology, 385 Haeyang-ro, Yeongdo-gu, Busan 49111, Republic of Korea
- Department of Chemistry, Pukyong National University, Busan 48513, Republic of Korea
| | - Chang-Su Heo
- Marine Natural Products Chemistry Laboratory, Korea Institute of Ocean Science and Technology, 385 Haeyang-ro, Yeongdo-gu, Busan 49111, Republic of Korea
- Department of Marine Biotechnology, University of Science and Technology (UST), 217 Gajungro, Yuseong-gu, Daejeon 34113, Republic of Korea
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3
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Li X, Ouyang X, Chen B, Liu S, Zeng J. Linkage and Stereochemistry Characters of Phenolic Antioxidant Product Formation. J Agric Food Chem 2023; 71:5382-5390. [PMID: 36693163 DOI: 10.1021/acs.jafc.2c06563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The present study developed a smart and novel strategy to elucidate the linkage and stereochemistry characters during phenolic antioxidant product formation. A series of phenolic isomers or analogues were treated with 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide radical, to create 16 antioxidant dimerization reactions in aqueous solution. The products were rapidly identified by ultraperformance liquid chromatography coupled with electrospray ionization quadrupole time-of-flight tandem mass-spectrometry. Through a systematic function-structure relationship analysis of these reactions and theoretical calculations, it is concluded that the phenolic antioxidant product is formed via linear linkage or furanocyclic linkage. The linear linkage is fulfilled via a radical coupling and controlled by the O-O linkage exclusion, meta-linkage exclusion, and catechol-activated principles. However, when an exocyclic π-bond conjugates with the phenolic core and is affixed at the -OH para-position, the furanocyclic linkage may occur via a subsequent intramolecular Michael addition. The intramolecular addition always lacks Re-attack to show "α,β diastereoselectivity." The α,β diastereoselectivity is the stereochemistry character of furanocyclic linkage during phenolic antioxidant product formation. All these novel findings can benefit not only the field food science but also other fields as well.
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Affiliation(s)
- Xican Li
- School of Chinese Herbal Medicine, Guangzhou University of Chinese Medicine, Guangzhou Higher Education Mega Center, Waihuang East Road No. 232, Guangzhou510006, People's Republic of China
| | - Xiaojian Ouyang
- School of Chinese Herbal Medicine, Guangzhou University of Chinese Medicine, Guangzhou Higher Education Mega Center, Waihuang East Road No. 232, Guangzhou510006, People's Republic of China
| | - Ban Chen
- School of Biological Engineering and Food, Hubei University of Technology, Wuhan430068, People's Republic of China
| | - Shuqin Liu
- School of Chinese Herbal Medicine, Guangzhou University of Chinese Medicine, Guangzhou Higher Education Mega Center, Waihuang East Road No. 232, Guangzhou510006, People's Republic of China
| | - Jingyuan Zeng
- School of Chinese Herbal Medicine, Guangzhou University of Chinese Medicine, Guangzhou Higher Education Mega Center, Waihuang East Road No. 232, Guangzhou510006, People's Republic of China
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Nshimiyimana R, Glynn SJ, Serhan CN, Petasis NA. Stereocontrolled total synthesis of Resolvin D4 and 17( R)-Resolvin D4. Org Biomol Chem 2023; 21:1667-1673. [PMID: 36345797 PMCID: PMC9974885 DOI: 10.1039/d2ob01697d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The total synthesis of Resolvin D4 and its 17(R)-hydroxy-epimer is reported. These lipid-based natural products are biosynthesized from docosahexaenoic acid (DHA, C22:6) during the body's rapid cellular and chemical response to injurious stimuli and are part of a large class of bioactive molecules that resolve inflammation. Our convergent synthesis employed a chiral pool strategy starting from glycidol derivatives and D-erythrose to introduce stereogenic centers. A copper(I)-mediated cross coupling between propargyl bromide and terminal acetylenic precursors yielded core structures of late-stage key intermediates. A simultaneous Lindlar reduction of the skipped diynyl moiety followed by silyl group cleavage securely completed the synthesis. The synthetic availability of these molecules helped further elucidate their stereoselective biofunctions.
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Affiliation(s)
- Robert Nshimiyimana
- Department of Chemistry and Loker Hydrocarbon Research Institute, University of Southern California, Los Angeles, CA 90089, USA.
- Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Stephen J Glynn
- Department of Chemistry and Loker Hydrocarbon Research Institute, University of Southern California, Los Angeles, CA 90089, USA.
| | - Charles N Serhan
- Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA
| | - Nicos A Petasis
- Department of Chemistry and Loker Hydrocarbon Research Institute, University of Southern California, Los Angeles, CA 90089, USA.
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Zhang J, Zhao R, Hou G, Wang Q, Zhao F, Liu Z, Meng Q. Stereoscopic Differences in the Identification, Bioactivity, and Metabolism of C-20 and C-24 Epimeric Ginseng Saponins. Mini Rev Med Chem 2022; 23:804-820. [PMID: 36237162 DOI: 10.2174/1389557522666221012095258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 08/05/2022] [Accepted: 08/17/2022] [Indexed: 11/22/2022]
Abstract
Ginseng, the roots and/or rhizomes of Panax spp.(Araliaceae), has been used as a popular, herbal medicine in East Asia for at least two millennia. As a functional food and health-enhancing supplement, ginseng has been shown to have a wide range of pharmacological effects on cognition and blood circulation as well as antioxidant, antitumor, and anti-fatigue effects. The main active properties of ginseng are considered to be the triterpene saponins, often referred to as ginsenosides, which are the basis for their wide-ranging of pharmacological effects. Four of these glycosides, including protopanaxadiol, protopanaxatriol, ocotillol, and oleanolic acid, are the most common saponins found in ginseng. Compared to other ginsenosides, the C-20 chimeric ginsenosides, including Rg3, Rh2, Rg2, Rh1, PF11, C-20, and C-24, as well as epimeric ocotillol-type saponins and their derivatives exhibit significant, steric differences in biological activity and metabolism. 20(R)-ginseng saponins, one class of important rare ginsenosides, have antitumor, antioxidative, antifatigue, neuroprotective and osteoclastogenesis inhibitory effects. However, 20(R)-ginsenosides are rare in natural products and are usually prepared from 20(S)-isomers through chemical differential isomerization and microbial transformation. The C20 configuration of 20(R)-ginseng saponins is usually determined by 13C NMR and X-ray single-crystal diffraction. There are regular differences in the chemical shift values of some of the carbons of the 20(S)- and 20(R)-epimers, including C-17, C-21, and C-22. Owing to their chemical structure and pharmacological and stereoselective properties, 20(R)-ginseng saponins have attracted a great deal of attention in recent years. Herein, the stereoscopic differences in the identification, bioactivity, and metabolism of C-20 and C-24 epimeric ginseng saponins are summarized.
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Affiliation(s)
- Juan Zhang
- School of Pharmacy, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Yantai University, Yantai, 264005, P.R. China
| | - Ruolin Zhao
- School of Pharmacy, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Yantai University, Yantai, 264005, P.R. China
| | - Guige Hou
- School of Pharmacy, Binzhou Medical University, Yantai 264003, China
| | - Qibao Wang
- School of Biological Science, Jining Medical University, No. 669 Xueyuan Road, Donggang District, Rizhao, Shandong Province 276800, China
| | - Fenglan Zhao
- School of Pharmacy, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Yantai University, Yantai, 264005, P.R. China
| | - Zhi Liu
- Suzhou Medinoah Co., Ltd., Suzhou, 215000, P.R. China
| | - Qingguo Meng
- School of Pharmacy, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Yantai University, Yantai, 264005, P.R. China
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6
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Lambeth TR, Julian RR. Efficient Isothiocyanate Modification of Peptides Facilitates Structural Analysis by Radical-Directed Dissociation. J Am Soc Mass Spectrom 2022; 33:1338-1345. [PMID: 34670075 DOI: 10.1021/jasms.1c00237] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Radical-directed dissociation (RDD) is a powerful technique for structural characterization of peptides in mass spectrometry experiments. Prior to analysis, a radical precursor must typically be appended to facilitate generation of a free radical. To explore the use of a radical precursor that can be easily attached in a single step, we modified peptides using a "click" reaction with iodophenyl isothiocyanate. Coupling with amine functional groups proceeds with high yields, producing stable iodophenylthiourea-modified peptides. Photodissociation yields were recorded at 266 and 213 nm for the 2-, 3-, and 4-iodo isomers of the modifier and found to be highest for the 4-iodo isomer in nearly all cases. Fragmentation of the modified peptides following collisional activation revealed favorable losses of the tag, and electronic structure calculations were used to evaluate a potential mechanism involving hydrogen transfer within the thiourea group. Examination of RDD data revealed that 4-iodobenzoic acid, 4-iodophenylthiourea, and 3-iodotyrosine yield similar fragmentation patterns for a given peptide, although differences in fragment abundance are noted. Iodophenyl isothiocyanate labeling in combination with RDD can be used to differentiate isomeric amino acids within peptides, which should facilitate simplified evaluation of isomers present in complex biological samples.
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Affiliation(s)
- Tyler R Lambeth
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Ryan R Julian
- Department of Chemistry, University of California, Riverside, California 92521, United States
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7
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Wang Y, Sun D, Mei Y, Wu S, Li X, Li S, Wang J, Gao L, Xu H, Tuo Y. Population Pharmacokinetics and Dosing Regimen Optimization of Latamoxef in Chinese Children. Pharmaceutics 2022; 14:1033. [PMID: 35631619 PMCID: PMC9146031 DOI: 10.3390/pharmaceutics14051033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 04/26/2022] [Accepted: 05/09/2022] [Indexed: 02/04/2023] Open
Abstract
The present study aimed to establish population pharmacokinetic models of latamoxef, as well as its R- and S-epimers, and generate findings to guide the individualized administration of latamoxef in pediatric patients. A total of 145 in-hospital children aged 0.08-10.58 years old were included in this study. Three population pharmacokinetic models of latamoxef and its R- and S-epimers were established. The stability and predictive ability of the final models were evaluated by utilizing goodness-of-fit plots, nonparametric bootstrapping, and normalized prediction distribution errors. The final model of total latamoxef was considered as a basis for the dosing regimen. A two-compartment model with first-order elimination best described the pharmacokinetics of total latamoxef. The population typical values of total latamoxef were as follows: central compartment distribution volume (V1) of 4.84 L, peripheral compartment distribution volume (V2) of 16.18 L, clearance (CL) of 1.00 L/h, and inter-compartmental clearance (Q) of 0.97 L/h. Moreover, R-epimer has a higher apparent volume of distribution and lower clearance than S-epimer. Body surface area (BSA) was identified as the most significant covariate to V, CL, and Q. Specific recommendations are given for dosage adjustment in pediatric patients based on BSA. This study highlights that a BSA-normalized dose of latamoxef was required when treating different bacteria to reach the therapeutic target more effectively.
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Affiliation(s)
- Yang Wang
- Department of Clinical Pharmacy, Wuhan Children’s Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430016, China; (Y.W.); (Y.M.); (X.L.); (S.L.); (J.W.); (L.G.); (H.X.)
| | - Dan Sun
- Department of Neurology, Wuhan Children’s Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430016, China;
| | - Yan Mei
- Department of Clinical Pharmacy, Wuhan Children’s Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430016, China; (Y.W.); (Y.M.); (X.L.); (S.L.); (J.W.); (L.G.); (H.X.)
| | - Sanlan Wu
- Department of Pharmacy, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China;
| | - Xinlin Li
- Department of Clinical Pharmacy, Wuhan Children’s Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430016, China; (Y.W.); (Y.M.); (X.L.); (S.L.); (J.W.); (L.G.); (H.X.)
| | - Sichan Li
- Department of Clinical Pharmacy, Wuhan Children’s Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430016, China; (Y.W.); (Y.M.); (X.L.); (S.L.); (J.W.); (L.G.); (H.X.)
| | - Jun Wang
- Department of Clinical Pharmacy, Wuhan Children’s Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430016, China; (Y.W.); (Y.M.); (X.L.); (S.L.); (J.W.); (L.G.); (H.X.)
| | - Liuliu Gao
- Department of Clinical Pharmacy, Wuhan Children’s Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430016, China; (Y.W.); (Y.M.); (X.L.); (S.L.); (J.W.); (L.G.); (H.X.)
| | - Hua Xu
- Department of Clinical Pharmacy, Wuhan Children’s Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430016, China; (Y.W.); (Y.M.); (X.L.); (S.L.); (J.W.); (L.G.); (H.X.)
| | - Yali Tuo
- Department of Clinical Pharmacy, Wuhan Children’s Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430016, China; (Y.W.); (Y.M.); (X.L.); (S.L.); (J.W.); (L.G.); (H.X.)
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8
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Jin Z, Bertholf RL, Yi X. Overcome Isomer Interference in 1α,25-Dihydroxyvitamin D Quantitation by Liquid Chromatography-Tandem Mass Spectrometry. J Appl Lab Med 2021; 7:737-746. [PMID: 34632483 DOI: 10.1093/jalm/jfab112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 08/16/2021] [Indexed: 11/12/2022]
Abstract
BACKGROUND The circulating concentration of 1α,25-dihydroxyvitamin D [1α,25(OH)2D] is very low, and the presence of multiple isomers may lead to inaccurate quantitation if not separated prior to analysis. Antibody-based immunoextraction procedures are sometimes used to remove structurally related isomers of 1α,25(OH)2D prior to an LC-MS/MS analysis. However, immunoextraction increases sample preparation time and cost. In addition, some dihydroxyvitamin D metabolites are not completely removed by immunoextraction. METHOD We developed an HPLC method using a phenyl-hexyl column to investigate interfering isomers of 1α,25(OH)2D. RESULT Using this method, 4-phenyl-1,2,4-triazoline-3,5-dione (PTAD) derivatization product of 1α,25(OH)2D was found to be present as 2 epimers, which were separated chromatographically with an area ratio of 2:1. PTAD derivatized metabolite of 25-hydroxyvitamin D3 [i.e., 4β,25-dihydroxyvitamin D3 (4β,25(OH)2D3)] eluted out between 6R and 6S epimers of derivatized 1α,25(OH)2D3. If not chromatographically resolved, 4β,25(OH)2D can affect 1α,25(OH)2D quantitation. In a method comparison study, it was found that the presence of 4β,25(OH)2D produced positive bias up to 127% on 1α,25(OH)2D3 quantitation. CONCLUSION The LC-MS/MS method we developed without an immunoextraction procedure was able to resolve the major interference peak from 1α,25(OH)2D and achieved reliable quantitation of 1α,25(OH)2D.
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Affiliation(s)
- Zhicheng Jin
- Department of Pathology and Genomic Medicine, Houston Methodist Hospital, Houston, TX, USA
| | - Roger L Bertholf
- Department of Pathology and Genomic Medicine, Houston Methodist Hospital, Houston, TX, USA.,Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, NY, USA
| | - Xin Yi
- Department of Pathology and Genomic Medicine, Houston Methodist Hospital, Houston, TX, USA.,Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, NY, USA
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Tan XM, Guan LJ, Fang YG, Li YM, Zheng ZL, Chen LM, Gao HM, Wang ZM. [Separation and structural elucidation of C25 epimers of furostanol saponin from aerial parts of Paris polyphylla var. chinensis]. Zhongguo Zhong Yao Za Zhi 2021; 46:4023-4033. [PMID: 34467711 DOI: 10.19540/j.cnki.cjcmm.20210623.302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Paris polyphylla var. chinensis(PPC) is used as one of the origin plants of Paridis Rhizoma described in the Chinese Pharmacopoeia(2020 edition). Its resources shortage makes the planting scale gradually expand, and plenty of aerial parts are abandoned because of not being effectively used. On the basis of previous research, this study separated steroidal saponins to further clarify the chemical composition of the aerial parts of PPC. As a result, three pairs of 25R or 25S epimers of furostanol saponins were obtained by various column chromatography techniques. Their structures were identified as neosolanigroside Y6(1), solanigroside Y6(2), neoprotogracillin(3), protogracillin(4), neoprotodioscin(5) and protodioscin(6) by spectral data combining with chemical transformation. Compound 1 is a new compound, and compounds 2, 3 and 5 are isolated from Paris plants for the first time. Compounds 4 and 6 are isolated from this plant for the first time. Previously, only several spirostanol glycosides with 25S configuration were isolated from Paris plants. Guided by mass spectrometry, the present study isolated the furostanol saponins with 25S configuration from this genus for the first time, which further enriches the chemical information of Paris genus and provides a reference for the isolation of similar compounds.
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Affiliation(s)
- Xiao-Min Tan
- Tianjin University of Traditional Chinese Medicine Tianjin 300193, China National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Liang-Jun Guan
- National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Yun-Ge Fang
- Tianjin University of Traditional Chinese Medicine Tianjin 300193, China National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Yan-Min Li
- National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Zi-Lu Zheng
- National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Liang-Mian Chen
- National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Hui-Min Gao
- National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
| | - Zhi-Min Wang
- National Engineering Laboratory of Quality Control Technology of Chinese Materia Medica, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China
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Nakhjavani M, Smith E, Yeo K, Palethorpe HM, Tomita Y, Price TJ, Townsend AR, Hardingham JE. Anti-Angiogenic Properties of Ginsenoside Rg3 Epimers: In Vitro Assessment of Single and Combination Treatments. Cancers (Basel) 2021; 13:cancers13092223. [PMID: 34066403 PMCID: PMC8125638 DOI: 10.3390/cancers13092223] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 04/28/2021] [Accepted: 05/04/2021] [Indexed: 02/07/2023] Open
Abstract
Tumour angiogenesis plays a key role in tumour growth and progression. The application of current anti-angiogenic drugs is accompanied by adverse effects and drug resistance. Therefore, finding safer effective treatments is needed. Ginsenoside Rg3 (Rg3) has two epimers, 20(S)-Rg3 (SRg3) and 20(R)-Rg3 (RRg3), with stereoselective activities. Using response surface methodology, we optimised a combination of these two epimers for the loop formation of human umbilical vein endothelial cell (HUVEC). The optimised combination (C3) was tested on HUVEC and two murine endothelial cell lines. C3 significantly inhibited the loop formation, migration, and proliferation of these cells, inducing apoptosis in HUVEC and cell cycle arrest in all of the cell lines tested. Using molecular docking and vascular endothelial growth factor (VEGF) bioassay, we showed that Rg3 has an allosteric modulatory effect on vascular endothelial growth factor receptor 2 (VEGFR2). C3 also decreased the VEGF expression in hypoxic conditions, decreased the expression of aquaporin 1 and affected AKT signaling. The proteins that were mostly affected after C3 treatment were those related to mammalian target of rapamycin (mTOR). Eukaryotic translation initiation factor 4E (eIF4E)-binding protein 1 (4E-BP1) was one of the important targets of C3, which was affected in both hypoxic and normoxic conditions. In conclusion, these results show the potential of C3 as a novel anti-angiogenic drug.
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Affiliation(s)
- Maryam Nakhjavani
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia; (M.N.); (K.Y.); (Y.T.); (J.E.H.)
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia; (T.J.P.); (A.R.T.)
| | - Eric Smith
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia; (M.N.); (K.Y.); (Y.T.); (J.E.H.)
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia; (T.J.P.); (A.R.T.)
- Correspondence: ; Tel.: +61-8-8222-6142
| | - Kenny Yeo
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia; (M.N.); (K.Y.); (Y.T.); (J.E.H.)
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia; (T.J.P.); (A.R.T.)
| | - Helen M. Palethorpe
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, SA 5000, Australia;
| | - Yoko Tomita
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia; (M.N.); (K.Y.); (Y.T.); (J.E.H.)
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia; (T.J.P.); (A.R.T.)
- Oncology Unit, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia
| | - Tim J. Price
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia; (T.J.P.); (A.R.T.)
- Oncology Unit, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia
| | - Amanda R. Townsend
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia; (T.J.P.); (A.R.T.)
- Oncology Unit, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia
| | - Jennifer E. Hardingham
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia; (M.N.); (K.Y.); (Y.T.); (J.E.H.)
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia; (T.J.P.); (A.R.T.)
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11
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Liu H, Xing SF, Cui WY, Zu ML, Lyu CL, Piao XL. [A novel dammarane-type saponin from Gynostemma pentaphyllum and its neuroprotective effect]. Zhongguo Zhong Yao Za Zhi 2021; 46:380-387. [PMID: 33645125 DOI: 10.19540/j.cnki.cjcmm.20200807.201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
One new and two known dammarane-type saponins were isolated from the leaves of Gynostemma pentaphyllum using various chromatographic methods. Their structures were identified by HR-ESI-MS,~( 1)H-NMR, ~(13)C-NMR, 2 D-NMR spectra as 2α,3β,12β,20,24(S)-tetrahdroxydammar-25-en-3-O-[β-D-glucopyranosyl(1→2)-β-D-glucopyranosyl]-20-O-β-D-xylopyranosyl(1→6)-β-D-glucopyranoside(1, a new compound, namely gypenoside J5) and 2α,3β,12β,20,24(R)-tetrahdroxydammar-25-en-3-O-[β-D-glucopyranosyl(1→2)-β-D-glucopyranosyl]-20-O-β-D-xylopyranosyl(1→6)-β-D-glucopyranoside(2) and 2α,3β,12β,20-tetrahydroxy-25-hydroperoxy-dammar-23-en-3-O-[β-D-glucopyranosyl(1→2)][β-D-glucopyranosyl]-20-O-[β-D-xylopyranosyl(1→6)]-β-D-glucopy-ranoside(3), respectively. Compounds 1 and 2 were a pair of C-24 epimers. All compounds showed weak cytotoxicity agxinst H1299, HepG2, PC-3, SH-SY5 Y cancer cell lines. However, they exerted protective effect against SH-SY5 Y cellular damage induced by H_2O_2 dose-dependently, of which compound 1 displayed the strongest antioxidant effect. The present study suggested that G. pentaphyllum has antioxidative potential and the saponins from G. pentaphyllum are considered as the active compounds with neuroprotecitve effect.
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Affiliation(s)
- Hui Liu
- School of Pharmacy, Minzu University of China Beijing 100081, China
| | - Shao-Fang Xing
- School of Pharmacy, Minzu University of China Beijing 100081, China
| | - Wei-Ye Cui
- School of Pharmacy, Minzu University of China Beijing 100081, China
| | - Ma-Li Zu
- School of Pharmacy, Minzu University of China Beijing 100081, China
| | - Chun-Lin Lyu
- School of Pharmacy, Minzu University of China Beijing 100081, China
| | - Xiang-Lan Piao
- School of Pharmacy, Minzu University of China Beijing 100081, China
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12
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Nakhjavani M, Smith E, Townsend AR, Price TJ, Hardingham JE. Anti-Angiogenic Properties of Ginsenoside Rg3. Molecules 2020; 25:E4905. [PMID: 33113992 DOI: 10.3390/molecules25214905] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 10/20/2020] [Accepted: 10/21/2020] [Indexed: 12/12/2022] Open
Abstract
Ginsenoside Rg3 (Rg3) is a member of the ginsenoside family of chemicals extracted from Panax ginseng. Like other ginsenosides, Rg3 has two epimers: 20(S)-ginsenoside Rg3 (SRg3) and 20(R)-ginsenoside Rg3 (RRg3). Rg3 is an intriguing molecule due to its anti-cancer properties. One facet of the anti-cancer properties of Rg3 is the anti-angiogenic action. This review describes the controversies on the effects and effective dose range of Rg3, summarizes the evidence on the efficacy of Rg3 on angiogenesis, and raises the possibility that Rg3 is a prodrug.
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13
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Yang Y, Liu G, Tu Z, Wang H, Hu Y, Mao J, Zhang J. Insight into the Mechanism of Reduced IgG/IgE Binding Capacity in Ovalbumin as Induced by Glycation with Monose Epimers through Liquid Chromatography and High-Resolution Mass Spectrometry. J Agric Food Chem 2020; 68:6065-6075. [PMID: 32396375 DOI: 10.1021/acs.jafc.0c01233] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Ovalbumin (OVA) is one of the major food allergens in hen eggs. In this work, it was demonstrated that glycation with d-glucose and its epimers, including d-mannose, d-allose, d-galactose, and l-idose, could effectively attenuate the IgG/IgE binding of OVA, which was attributed to the covalent masking by sugars and to its structural changes. The glycation sites were determined, and their average degree of substitution was found using liquid chromatography coupled with high-resolution mass spectrometry. Fluctuations in OVA conformation were monitored by conventional spectrometry. Compared to those of OVA-Man and OVA-Glu, OVA-All, OVA-Gal, and OVA-Ido showed a higher glycation extent, and the alterations on their steric layouts were more drastic, suggesting that the configuration of hydroxyl groups at positions C-3, C-4, and C-5 in sugars might be important for the glycation reactivity; as such, their capabilities in binding with IgG/IgE decreased more significantly. Attempts were made to provide valuable information for in-depth understanding of the differences in biochemical functionality among epimeric sugars. These insights would be helpful for designing sweetened food products with a desirable level of safety.
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Affiliation(s)
- Yipeng Yang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi 330047, China
| | - Guangxian Liu
- Jiangxi Academy of Agricultural Sciences, Nanchang, Jiangxi 330200, China
| | - Zongcai Tu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi 330047, China
- Engineering Research Center of Freshwater Fish High-Value Utilization of Jiangxi Province, College of Life Sciences, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Hui Wang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi 330047, China
| | - Yueming Hu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi 330047, China
| | - Jihua Mao
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi 330047, China
| | - Jingjing Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi 330047, China
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14
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Chen X, Zhou J, Jin M. [Determination of 25-hydroxyl vitamin D in serum by isotope dilution ultra-fast liquid chromatography-tandem mass spectrometry]. Wei Sheng Yan Jiu 2019; 48:981-987. [PMID: 31875826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
OBJECTIVE To establish a rapid and accurate method for determination of 25-hydroxyl vitamin D2, 25-hydroxyl vitamin D3 and 3-epi-25-hydroxyl vitamin D3 in serum by isotope dilution ultra-fast liquid chromatography-tandem mass spectrometry(UFLC-MS/MS). METHODS The serum sample was extracted by nhexane after methanol/acetonitrile precipitation protein, and then the extract was concentrated by nitrogen and volumed with the primary mobile phase. The chromatographic separation was carried out on a Phenomenex Kinetex F5 column(2. 1 mm × 150 mm, 1. 7 μm) by using 0. 1%(V/V) formic acid and 0. 1%(V/V) formic acid/methanol solution as the mobile phase with the gradient elution. Detection was performed in positive multi-reaction monitoring(MRM) mode with the isotope internal labeling method for quantification. RESULTS The baseline separation was obtained within 6 min for the epimer 25-hydroxyl vitamin D3 and 3-epi-25-hydroxyl vitamin D3, and the accurate qualification was obtained for the simultaneous determination of 25-hydroxyl vitamin D2, 25-hydroxyl vitamin D3 and 3-epi-25-hydroxyl vitamin D3. The three analytes showed good linear relationship within the range of 0. 5-50. 0 μg/L with a correlation coefficient r >0. 9995. The limits of detection(LODs) and the limits of quantitation(LOQs) of the method were 0. 15 μg/L and 0. 5 μg/L, respectively. The recoveries of the method were84. 3%-109. 0%(n = 11) at the three spiked levels of 1. 0, 10. 0 and 30. 0 μg/L, and the relative standard deviations(RSDs) were between 0. 8%-6. 8%. At the same time, the certified standard reference materials(SRM) of the America National Institute of Standards and Technology(NIST) Level 1, Level 2, Level 3 and Level 4(SRM 972 a)were used as the quality control samples for verification, the relative deviations of the measurement result were less than 5% compared with the reference values. CONCLUSION The developed method has the characteristics of simplicity, rapidity, sensitivity and accuracy, and is suitable for the simultaneous rapid determination of 25-hydroxyl vitamin D2, 25-hydroxyl vitamin D3 and 3-epi-25-hydroxyl vitamin D3 in serum.
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Affiliation(s)
- Xiaohong Chen
- Key Laboratory of Health Risk Appraisal for Trace Toxic Chemicals of Zhejiang Province, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China
| | - Jian Zhou
- Key Laboratory of Health Risk Appraisal for Trace Toxic Chemicals of Zhejiang Province, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China
| | - Micong Jin
- Key Laboratory of Health Risk Appraisal for Trace Toxic Chemicals of Zhejiang Province, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China
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15
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Nakhjavani M, Palethorpe HM, Tomita Y, Smith E, Price TJ, Yool AJ, Pei JV, Townsend AR, Hardingham JE. Stereoselective Anti-Cancer Activities of Ginsenoside Rg3 on Triple Negative Breast Cancer Cell Models. Pharmaceuticals (Basel) 2019; 12:E117. [PMID: 31374984 PMCID: PMC6789838 DOI: 10.3390/ph12030117] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 07/24/2019] [Accepted: 07/29/2019] [Indexed: 02/06/2023] Open
Abstract
Ginsenoside Rg3 (Rg3) has two epimers, 20(S)-ginsenoside Rg3 (SRg3) and 20(R)-ginsenoside Rg3 (RRg3), and while Rg3 itself has been reported to have anti-cancer properties, few studies have been reported on the anti-cancer effects of the different epimers. The aim was to investigate the stereoselective effects of the Rg3 epimers on triple negative breast cancer (TNBC) cell lines, tested using cell-based assays for proliferation, apoptosis, cell cycle arrest, migration and invasion. Molecular docking showed that Rg3 interacted with the aquaporin 1 (AQP1) water channel (binding score -9.4 kJ mol-1). The Xenopus laevis oocyte expression system was used to study the effect of Rg3 epimers on the AQP1 water permeability. The AQP1 expression in TNBC cell lines was compared with quantitative-polymerase chain reaction (PCR). The results showed that only SRg3 inhibited the AQP1 water flux and inhibited the proliferation of MDA-MB-231 (100 μM), due to cell cycle arrest at G0/G1. SRg3 inhibited the chemoattractant-induced migration of MDA-MB-231. The AQP1 expression in MDA-MB-231 was higher than in HCC1143 or DU4475 cell lines. These results suggest a role for AQP1 in the proliferation and chemoattractant-induced migration of this cell line. Compared to SRg3, RRg3 had more potency and efficacy, inhibiting the migration and invasion of MDA-MB-231. Rg3 has stereoselective anti-cancer effects in the AQP1 high-expressing cell line MDA-MB-231.
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Affiliation(s)
- Maryam Nakhjavani
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia
| | - Helen M Palethorpe
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia
| | - Yoko Tomita
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia
- Oncology Unit, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia
| | - Eric Smith
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia
| | - Timothy J Price
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia
- Oncology Unit, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia
| | - Andrea J Yool
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia
| | - Jinxin V Pei
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia
| | - Amanda R Townsend
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia
- Oncology Unit, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia
| | - Jennifer E Hardingham
- Molecular Oncology, Basil Hetzel Institute, The Queen Elizabeth Hospital, Woodville South, SA 5011, Australia.
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia.
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16
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Lyon YA, Collier MP, Riggs DL, Degiacomi MT, Benesch JLP, Julian RR. Structural and functional consequences of age-related isomerization in α-crystallins. J Biol Chem 2019; 294:7546-7555. [PMID: 30804217 PMCID: PMC6514633 DOI: 10.1074/jbc.ra118.007052] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 02/15/2019] [Indexed: 12/31/2022] Open
Abstract
Long-lived proteins are subject to spontaneous degradation and may accumulate a range of modifications over time, including subtle alterations such as side-chain isomerization. Recently, tandem MS has enabled identification and characterization of such peptide isomers, including those differing only in chirality. However, the structural and functional consequences of these perturbations remain largely unexplored. Here, we examined the impact of isomerization of aspartic acid or epimerization of serine at four sites mapping to crucial oligomeric interfaces in human αA- and αB-crystallin, the most abundant chaperone proteins in the eye lens. To characterize the effect of isomerization on quaternary assembly, we utilized synthetic peptide mimics, enzyme assays, molecular dynamics calculations, and native MS experiments. The oligomerization of recombinant forms of αA- and αB-crystallin that mimic isomerized residues deviated from native behavior in all cases. Isomerization also perturbs recognition of peptide substrates, either enhancing or inhibiting kinase activity. Specifically, epimerization of serine (αASer-162) dramatically weakened inter-subunit binding. Furthermore, phosphorylation of αBSer-59, known to play an important regulatory role in oligomerization, was severely inhibited by serine epimerization and altered by isomerization of nearby αBAsp-62. Similarly, isomerization of αBAsp-109 disrupted a vital salt bridge with αBArg-120, a contact that when broken has previously been shown to yield aberrant oligomerization and aggregation in several disease-associated variants. Our results illustrate how isomerization of amino acid residues, which may seem to be only a minor structural perturbation, can disrupt native structural interactions with profound consequences for protein assembly and activity.
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Affiliation(s)
- Yana A Lyon
- From the Department of Chemistry, University of California, Riverside, Riverside, California 92521
| | - Miranda P Collier
- the Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom, and
| | - Dylan L Riggs
- From the Department of Chemistry, University of California, Riverside, Riverside, California 92521
| | - Matteo T Degiacomi
- the Department of Chemistry, Durham University, South Road, Durham DH1 3LE, United Kingdom
| | - Justin L P Benesch
- the Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom, and
| | - Ryan R Julian
- From the Department of Chemistry, University of California, Riverside, Riverside, California 92521,
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17
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Nakhjavani M, Hardingham JE, Palethorpe HM, Tomita Y, Smith E, Price TJ, Townsend AR. Ginsenoside Rg3: Potential Molecular Targets and Therapeutic Indication in Metastatic Breast Cancer. Medicines (Basel) 2019; 6:E17. [PMID: 30678106 DOI: 10.3390/medicines6010017] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 01/21/2019] [Accepted: 01/23/2019] [Indexed: 01/28/2023]
Abstract
Breast cancer is still one of the most prevalent cancers and a leading cause of cancer death worldwide. The key challenge with cancer treatment is the choice of the best therapeutic agents with the least possible toxicities on the patient. Recently, attention has been drawn to herbal compounds, in particular ginsenosides, extracted from the root of the Ginseng plant. In various studies, significant anti-cancer properties of ginsenosides have been reported in different cancers. The mode of action of ginsenoside Rg3 (Rg3) in in vitro and in vivo breast cancer models and its value as an anti-cancer treatment for breast cancer will be reviewed.
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Coufal-Majewski S, Stanford K, McAllister T, Wang Y, Blakley B, McKinnon J, Swift ML, Chaves AV. Effects of Continuously Feeding Diets Containing Cereal Ergot Alkaloids on Nutrient Digestibility, Alkaloid Recovery in Feces, and Performance Traits of Ram Lambs. Toxins (Basel) 2017; 9:E405. [PMID: 29257065 PMCID: PMC5744125 DOI: 10.3390/toxins9120405] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 12/05/2017] [Accepted: 12/14/2017] [Indexed: 02/03/2023] Open
Abstract
Allowable limits for cereal ergot alkaloids in livestock feeds are being re-examined, and the objective of this study was to compare nutrient digestibility, growth performance and carcass characteristics of ram lambs fed a range of alkaloid concentrations, including the maximum currently allowed in Canada (2 to 3 ppm). Four pelleted diets were fed: control, with no added alkaloids; 930; 1402; and 2447 ppb alkaloids based on total R and S epimers. Eight ram lambs (30.0 ± 3.1 kg) were used to examine the impacts of dietary treatments on nutrient digestibility and alkaloid recovery from feces. Concentrations of dietary alkaloids evaluated did not affect nutrient digestibility or N metabolism. Excepting ergocornine and ergocryptine, recovery of alkaloids in feces varied among periods, suggesting that individual lambs may differ in their ability to metabolize ergocristine, ergometrine, ergosine, ergotamine and their S epimers. In a second experiment, ram lambs (n = 47, 30 ± 8 kg) were randomly assigned to a diet and weighed weekly until they achieved a slaughter weight of ≥ 45 kg (average 9 weeks; range 6 to 13 weeks). Intake of DM did not differ (p = 0.91) among diets, although lambs fed 2447 ppb alkaloids had a lower (p < 0.01) ADG than did lambs receiving other treatments. The concentration of serum prolactin linearly declined (p < 0.01) with increasing alkaloids. Feeding 2447 ppb total alkaloids negatively impacted growth, while feeding 1402 ppb did not harm growth performance, but reduced carcass dressing percentage. Due to different concentrations of alkaloids affecting growth and carcass characteristics in the present study, determining allowable limits for total dietary alkaloids will require a better understanding of impacts of alkaloid profiles and interactions among individual alkaloids.
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Affiliation(s)
- Stephanie Coufal-Majewski
- Faculty of Science, School of Life and Environmental Sciences, University of Sydney, Sydney, NSW 2006, Australia.
| | - Kim Stanford
- Livestock Research Section, Alberta Agriculture and Forestry, Lethbridge, AB T1J 4V6, Canada.
| | - Tim McAllister
- Science and Technology Branch, Agriculture and Agri-Food Canada, Lethbridge, AB T1J 4B1, Canada.
| | - Yuxi Wang
- Science and Technology Branch, Agriculture and Agri-Food Canada, Lethbridge, AB T1J 4B1, Canada.
| | - Barry Blakley
- Department of Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, SK S7N 5B4, Canada.
| | - John McKinnon
- Department of Animal Science, University of Saskatchewan, Saskatoon, SK S7N 5B4, Canada.
| | - Mary Lou Swift
- Ruminant Nutrition, Hi-Pro Feeds, Okotoks, AB T1S 1A2, Canada.
| | - Alexandre V Chaves
- Faculty of Science, School of Life and Environmental Sciences, University of Sydney, Sydney, NSW 2006, Australia.
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Liu J, Xu YR, An XS, Hou GG, Meng QG. Synthesis and crystal structures of a 3-acetylated (20S,24S)-ocotillol-type saponin and its C-24 epimer. Acta Crystallogr C Struct Chem 2017; 73:464-469. [PMID: 28579568 DOI: 10.1107/s2053229617006507] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 04/30/2017] [Indexed: 11/10/2022] Open
Abstract
In order to study the in vivo protective effect on myocardial ischemia, (20S,24R)-epoxydammarane-12β,25-diol, (V), and (20S,24S)-epoxydammarane-12β,25-diol, (VI), were synthesized through a novel synthetic route. Two key intermediates, namely (20S,24R)-3-acetyl-20,24-epoxydammarane-3β,12β,25-triol, (III) [obtained as the hemihydrate, C32H54O5·0.5H2O, (IIIa), and the ethanol hemisolvate, C32H54O5·0.5C2H5OH, (IIIb), with identical conformations but different crystal packings], and (20S,24S)-3-acetyl-20,24-epoxydammarane-3β,12β,25-triol, C32H54O5, (IV), were obtained during the synthesis. The structures were confirmed by 1H NMR, 13C NMR and HRMS analyses, and single-crystal X-ray diffraction. Molecules of (IIIa) are extended into a two-dimensional network constructed with water molecules linked alternately through intermolecular O-H...O hydrogen bonds, which are further stacked into a three-dimensional network. Compound (IIIb) contains two completely asymmetric molecules, which are linked in a disordered manner through intermolecular C-H...O hydrogen bonds. While the crystal stacks in compound (IV) are linked via weak C-H...O hydrogen bonds, the hydrogen-bonded chains extend helically along the crystallographic b axis.
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Affiliation(s)
- Juan Liu
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai 264005, People's Republic of China
| | - Yang Rong Xu
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai 264005, People's Republic of China
| | - Xing Si An
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai 264005, People's Republic of China
| | - Gui Ge Hou
- School of Pharmacy, Binzhou Medical University, Yantai 264003, People's Republic of China
| | - Qing Guo Meng
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai 264005, People's Republic of China
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Djekic-Ivankovic M, Lavery P, Agellon S, Weiler HA. The C-3α Epimer of 25-Hydroxycholecalciferol from Endogenous and Exogenous Sources Supports Normal Growth and Bone Mineral Density in Weanling Rats. J Nutr 2017; 147:141-151. [PMID: 27881592 DOI: 10.3945/jn.116.231753] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 06/09/2016] [Accepted: 10/31/2016] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND The C-3α epimer of 25-hydroxycholecalciferol [3-epi-25(OH)D3] is elevated in infants. OBJECTIVES We tested whether increasing cholecalciferol intake results in a dose-response in plasma 3-epi-25(OH)D3 We also examined bone and mineral metabolism in response to 3-epi-25(OH)D3 treatment. METHODS Sprague Dawley rats (4 wk old) were randomly assigned (n = 6/group of each sex) to AIN-93G diets with cholecalciferol at 1 (control), 2, or 4 IU/g diet for objective 1 and to diets with 3-epi-25(OH)D3 at 0.5 or 1 IU/g diet or 25-hydroxycholecalciferol [25(OH)D3] at 0.5 IU/g diet for objective 2 for 8 wk. Measurements at weeks 0, 4, and 8 included body weight and length, plasma vitamin D metabolites, bone biomarkers, and bone mineral density determined by using dual-energy X-ray absorptiometry. Lumbar vertebra 3 (L3) geometry and volumetric bone mineral density (vBMD) were measured using microcomputed tomography. Differences between groups were identified for males and females separately. RESULTS Weight and food intake were not different between groups. Elevated plasma 3-epi-25(OH)D3 was observed only in females in the 4 IU cholecalciferol/g diet group (mean ± SD: 24.7 ± 17.1 ng/mL), compared with the control group (5.3 ± 1.4 ng/mL; P = 0.001). By week 8, both male and female rats in the 3-epi-25(OH)D3 groups had >87% greater plasma 3-epi-25(OH)D3 concentrations relative to the 25(OH)D3 reference group (P < 0.0001). At week 8 in males only, parathyroid hormone was significantly lower (P = 0.019) in both 3-epi-25(OH)D3 groups than in the 25(OH)D3 group, and L3 total vBMD was higher (P = 0.004) in the 0.5 IU 3-epi-25(OH)D3 group than in the 25(OH)D3 group. CONCLUSIONS Endogenously generated 3-epi-25(OH)D3 is more prominent in female than in male rats. Exogenous 3-epi-25(OH)D3 was as effective as 25(OH)D3 in supporting bone mineral accretion in both sexes. It thus appears that 3-epi-25(OH)D3 has biological activity and should be further explored.
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Affiliation(s)
- Marija Djekic-Ivankovic
- School of Dietetics and Human Nutrition, McGill University, Ste-Anne-de-Bellevue, Quebec, Canada
| | - Paula Lavery
- School of Dietetics and Human Nutrition, McGill University, Ste-Anne-de-Bellevue, Quebec, Canada
| | - Sherry Agellon
- School of Dietetics and Human Nutrition, McGill University, Ste-Anne-de-Bellevue, Quebec, Canada
| | - Hope A Weiler
- School of Dietetics and Human Nutrition, McGill University, Ste-Anne-de-Bellevue, Quebec, Canada
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21
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Hassan YI, Zhu H, Zhu Y, Zhou T. Beyond Ribosomal Binding: The Increased Polarity and Aberrant Molecular Interactions of 3-epi-deoxynivalenol. Toxins (Basel) 2016; 8:E261. [PMID: 27618101 DOI: 10.3390/toxins8090261] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 08/24/2016] [Accepted: 08/29/2016] [Indexed: 12/17/2022] Open
Abstract
Deoxynivalenol (DON) is a secondary fungal metabolite and contaminant mycotoxin that is widely detected in wheat and corn products cultivated around the world. Bio-remediation methods have been extensively studied in the past two decades and promising ways to reduce DON-associated toxicities have been reported. Bacterial epimerization of DON at the C3 carbon was recently reported to induce a significant loss in the bio-toxicity of the resulting stereoisomer (3-epi-DON) in comparison to the parental compound, DON. In an earlier study, we confirmed the diminished bio-potency of 3-epi-DON using different mammalian cell lines and mouse models and mechanistically attributed it to the reduced binding of 3-epi-DON within the ribosomal peptidyl transferase center (PTC). In the current study and by inspecting the chromatographic behavior of 3-epi-DON and its molecular interactions with a well-characterized enzyme, Fusarium graminearum Tri101 acetyltransferase, we provide the evidence that the C3 carbon epimerization of DON influences its molecular interactions beyond the abrogated PTC binding.
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22
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Schwochert J, Lao Y, Pye CR, Naylor MR, Desai PV, Gonzalez Valcarcel IC, Barrett JA, Sawada G, Blanco MJ, Lokey RS. Stereochemistry Balances Cell Permeability and Solubility in the Naturally Derived Phepropeptin Cyclic Peptides. ACS Med Chem Lett 2016; 7:757-61. [PMID: 27563399 DOI: 10.1021/acsmedchemlett.6b00100] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 06/06/2016] [Indexed: 12/22/2022] Open
Abstract
Cyclic peptide (CP) natural products provide useful model systems for mapping "beyond-Rule-of-5" (bRo5) space. We identified the phepropeptins as natural product CPs with potential cell permeability. Synthesis of the phepropeptins and epimeric analogues revealed much more rapid cellular permeability for the natural stereochemical pattern. Despite being more cell permeable, the natural compounds exhibited similar aqueous solubility as the corresponding epimers, a phenomenon explained by solvent-dependent conformational flexibility among the natural compounds. When analyzing the polarity of the solution structures we found that neither the number of hydrogen bonds nor the total polar surface area accurately represents the solvation energies of the high and low dielectric conformations. This work adds to a growing number of natural CPs whose solvent-dependent conformational behavior allows for a balance between aqueous solubility and cell permeability, highlighting structural flexibility as an important consideration in the design of molecules in bRo5 chemical space.
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Affiliation(s)
- Joshua Schwochert
- Chemistry
and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064, United States
| | - Yongtong Lao
- Chemistry
and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064, United States
| | - Cameron R. Pye
- Chemistry
and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064, United States
| | - Matthew R. Naylor
- Chemistry
and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064, United States
| | - Prashant V. Desai
- Lilly
Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana 46285, United States
| | | | - Jaclyn A. Barrett
- Lilly
Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana 46285, United States
| | - Geri Sawada
- Lilly
Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana 46285, United States
| | - Maria-Jesus Blanco
- Lilly
Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana 46285, United States
| | - R. Scott Lokey
- Chemistry
and Biochemistry, University of California Santa Cruz, Santa Cruz, California 95064, United States
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23
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Xu YR, Yang JJ, Liu J, Hou GG, Meng QG. Synthesis and crystal structures of C24- epimeric 20(R)-ocotillol-type saponins. Acta Crystallogr C Struct Chem 2016; 72:498-503. [PMID: 27256698 DOI: 10.1107/s2053229616007270] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Accepted: 05/01/2016] [Indexed: 11/11/2022]
Abstract
Ocotillol-type saponins have a wide spectrum of biological activities. Previous studies indicated that the configuration at the C24 position may be responsible for their stereoselectivity in pharmacological action and pharmacokinetics. Natural ocotillol-type saponins share a 20(S)-form but it has been found that the 20(R)-stereoisomers have different pharmacological effects. The semisynthesis of 20(R)-ocotillol-type saponins has not been reported and it is therefore worthwhile clarifying their crystal structures. Two C24 epimeric 20(R)-ocotillol-type saponins, namely (20R,24S)-20,24-epoxydammarane-3β,12β,25-triol, C30H52O4, (III), and (20R,24R)-20,24-epoxydammarane-3β,12β,25-triol monohydrate, C30H52O4·H2O, (IV), were synthesized, and their structures were elucidated by spectral studies and finally confirmed by single-crystal X-ray diffraction. The (Me)C-O-C-C(OH) torsion angle of (III) is 146.41 (14)°, whereas the corresponding torsion angle of (IV) is -146.4 (7)°, indicating a different conformation at the C24 position. The crystal stacking in (III) generates an R4(4)(8) motif, through which the molecules are linked into a one-dimensional double chain. The chains are linked via nonclassical C-H...O hydrogen bonds into a two-dimensional network, and further stacked into a three-dimensional structure. In contrast to (III), epimer (IV) crystallizes as a hydrate, in which the water molecules act as hydrogen-bond donors linking one-dimensional chains into a two-dimensional network through intermolecular O-H...O hydrogen bonds. The hydrogen-bonded chains extend helically along the crystallographic a axis and generate a C4(4)(8) motif.
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Affiliation(s)
- Yang Rong Xu
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai 264005, People's Republic of China
| | - Jing Jing Yang
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai 264005, People's Republic of China
| | - Juan Liu
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai 264005, People's Republic of China
| | - Gui Ge Hou
- School of Pharmacy, Binzhou Medical University, Yantai 264003, People's Republic of China
| | - Qing Guo Meng
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai 264005, People's Republic of China
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24
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Sun J, Fan S, Wang Z, Zhang G, Bao K, Zhang W. The total synthesis of D-chalcose and its C-3 epimer. Beilstein J Org Chem 2013; 9:2620-4. [PMID: 24367425 PMCID: PMC3869251 DOI: 10.3762/bjoc.9.296] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2013] [Accepted: 11/07/2013] [Indexed: 11/23/2022] Open
Abstract
We completed a new and efficient synthesis of D-chalcose (I) and the first synthesis of its C-3 epimer (I′) in nine steps with overall yields of 23% and 24%, respectively. The key steps in the sequence were the formation of the stereocenter on C3 via Grignard reaction, the introduction of the stereogenic center on C2 by Sharpless asymmetric dihydroxylation, the protection of the C1 and C2 hydroxy groups with tert-butyldimethylsilyl trifluoromethanesulfonate (TBSOTf), and the selective cleavage of the primary OTBS ether using catalytic DL-10-camphorsulfonic acid (CSA) in MeOH.
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Affiliation(s)
- Jun Sun
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Song Fan
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Zhan Wang
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Guoning Zhang
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Kai Bao
- Center for Molecular Imaging, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, United States
| | - Weige Zhang
- Key Laboratory of Structure-Based Drug Design & Discovery, Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, China
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Christodoulou MS, Sacchetti A, Ronchetti V, Caufin S, Silvani A, Lesma G, Fontana G, Minicone F, Riva B, Ventura M, Lahtela-Kakkonen M, Jarho E, Zuco V, Zunino F, Martinet N, Dapiaggi F, Pieraccini S, Sironi M, Dalla Via L, Gia OM, Passarella D. Quinazolinecarboline alkaloid evodiamine as scaffold for targeting topoisomerase I and sirtuins. Bioorg Med Chem 2013; 21:6920-8. [PMID: 24103429 DOI: 10.1016/j.bmc.2013.09.030] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 09/09/2013] [Accepted: 09/11/2013] [Indexed: 12/12/2022]
Abstract
This paper reports the synthesis of a series of evodiamine derivatives. We assayed the ability to inhibit cell growth on three human tumour cell lines (H460, MCF-7 and HepG2) and we evaluated the capacity to interfere with the catalytic activity of topoisomerase I both by the relaxation assay and the occurrence of the cleavable complex. Moreover, whose effect on sirtuins 1, 2 and 3 was investigated. Finally, molecular docking analyses were performed in an attempt to rationalize the biological results.
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Affiliation(s)
- Michael S Christodoulou
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy
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26
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Shah I, Petroczi A, Naughton DP. Method for simultaneous analysis of eight analogues of vitamin D using liquid chromatography tandem mass spectrometry. Chem Cent J 2012; 6:112. [PMID: 23025817 PMCID: PMC3505479 DOI: 10.1186/1752-153x-6-112] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Accepted: 09/25/2012] [Indexed: 11/29/2022] Open
Abstract
UNLABELLED BACKGROUND Despite considerable global investigation over several decades, the roles of vitamin D in health and disease development remains convoluted. One recognised issue is the difficulty of accurately measuring the active forms of vitamin D. Advances made include some new methods addressing the potential interference by excluding epimers and isobars. However, there is no evidence that epimers are without function. Therefore, the aim of this study was to develop and validate, for the first time, a new assay to simultaneously measure levels of six forms of vitamin D along with two epimers. The assay was applied to multilevel certified reference material (CRM) and 25 pooled human sera samples, obtained from the Vitamin D External Quality Assessment Scheme (DEQAS), to demonstrate its efficiency. RESULTS The assay is capable of simultaneously measuring eight vitamin D analogues over the calibration ranges and LODs (in nmol/L) of: 1α25(OH)2D2 [0.015-1; 0.01], 1α25(OH)2D3 [0.1-100; 0.01], 25OHD3 [0.5-100, 0.025], 3-epi-25OHD3 [0.1-100, 0.05], 25OHD2 [0.5-100, 0.025], 3-epi-25OHD2 [0.1-100, 0.05], vitamin D3 [0.5-100, 0.05] and vitamin D2 [0.5-100, 0.05], using stanozolol-d3 as internal standard. Certified reference material and external quality control samples (DEQAS) were analysed to meet the standards outlined by National Institute of Standards and Technology (NIST). Validation steps included recovery and both precision and accuracy under inter- and intra-day variation limit of detection, and analysis of each analyte over a linear range. All validation parameters were in line with acceptable Food and Drug Administration (FDA) guidelines. All eight analogues were quantified with the 25OHD levels being commensurate with DEQAS data. CONCLUSIONS This report details the application of a new LC-MS/MS based assay for the efficient analysis of eight analogues of vitamin D over a range of samples, which is a significant advance over the existing methods. Simultaneous measure of eight vitamin D analogues does not compromise the analytical capability of the assay to quantify the commonly used biomarker (25OHD) for vitamin D status. The results demonstrate the feasibility of applying the assay in research and clinical practice that i) excludes misleading measures owing to epimers and isobars and ii) is able to quantify the excluded component to facilitate further in vivo investigation into the roles of ubiquitous epimers.
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Affiliation(s)
- Iltaf Shah
- School of Life Sciences, Kingston University, London, UK
| | | | - Declan P Naughton
- School of Life Sciences, Kingston University, London, UK
- School of Life Sciences, Kingston University, Penrhyn Road, Kingston upon Thames, Surrey, KT1 2EE, UK
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