1
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Li A, La M, Wang Y, Chen T, Mian R, He F, Li Y, Zou D. Target-guided isolation and purification of cyclooxygenase-2 inhibitors from Meconopsis integrifolia (Maxim.) Franch. by high-speed counter-current chromatography combined with ultrafiltration liquid chromatography. J Sep Sci 2024; 47:e2300722. [PMID: 38234021 DOI: 10.1002/jssc.202300722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 12/04/2023] [Accepted: 12/22/2023] [Indexed: 01/19/2024]
Abstract
Meconopsis integrifolia (Maxim.) Franch. is used extensively in traditional Tibetan medicine for its potent anti-inflammatory properties. In this study, six cyclooxygenase-2 (COX-2) inhibitors were purified from M. integrifolia using high-speed counter-current chromatography guided by ultrafiltration liquid chromatography (ultrafiltration-LC). First, ultrafiltration-LC was performed to profile the COX-2 inhibitors in M. integrifolia. The reflux extraction conditions were further optimized using response surface methodology, and the results showed that the targeted COX-2 inhibitors could be well enriched under the optimized extraction conditions. Then the six target COX-2 inhibitors were separated by high-speed countercurrent chromatography with a solvent system composed of ethyl acetate/n-butanol/water (4:1:4, v/v/v. Finally, the six COX-2 inhibitors, including 21.2 mg of 8-hydroxyluteolin 7-sophoroside, 29.6 mg of 8-hydroxyluteolin 7-[6'''-acetylallosyl-(1→2)-glucoside], 42.5 mg of Sinocrassoside D3, 54.1 mg of Hypolaetin 7-[6'''-acetylallosyll-(l→2)-3''-acetylglucoside, 30.6 mg of Hypolaetin 7-[6'''-acetylallosyll-(l→2)-6''-acetylglucoside and 17.8 mg of Hypolaetin were obtained from 500 mg of sample. Their structures were elucidated by 1 H-NMR spectroscopy. This study reveals that ultrafiltration-LC combined with high-speed counter-current chromatography is a robust and efficient strategy for target-guided isolation and purification of bioactive molecules. It also enhances the scientific understanding of the anti-inflammatory properties of M. integrifolia but also paves the way for its further medicinal applications.
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Affiliation(s)
- Aijing Li
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, P. R. China
| | - Mencuo La
- School of Life Science, Qinghai Normal University, Xining, P. R. China
| | - Yao Wang
- School of Life Science, Qinghai Normal University, Xining, P. R. China
| | - Tao Chen
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, P. R. China
| | - Ruisha Mian
- School of Life Science, Qinghai Normal University, Xining, P. R. China
| | - Fangfang He
- School of Life Science, Qinghai Normal University, Xining, P. R. China
| | - Yulin Li
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, P. R. China
| | - Denglang Zou
- Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, P. R. China
- School of Life Science, Qinghai Normal University, Xining, P. R. China
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2
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Xu P, Wang X, Lin T, Shao Q, Peng J, Chu C, Tong S. A Strategy for Pinpointing Natural Bioactive Components Using Two-Dimensional Bioassay Profilings Combined with Comprehensive Two-Dimensional Countercurrent Chromatography × High-Performance Liquid Chromatography. Anal Chem 2022; 94:12715-12722. [PMID: 36076186 DOI: 10.1021/acs.analchem.2c02196] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Inspired by the interpretation of two-dimensional (2D) nuclear magnetic resonance spectra, an efficient strategy was proposed for pinpointing bioactive components from complex natural products. An off-line comprehensive countercurrent chromatography (CCC) × high-performance liquid chromatography (HPLC) was employed to achieve a 2D chemical chromatogram, and 2D bioassay profilings were obtained from bioassays of the eluent of the first dimension (1D) CCC and the eluent of the second dimension (2D) HPLC. Then 2D chemical chromatograms and 2D bioassay profilings were matched for pinpointing bioactive natural components from complex matrices. Thus, bioactive components in a complex matrix could be efficiently analyzed, separated, and bioactivity-determined. This experimental scheme was successfully demonstrated with a traditional medicinal herb Polygonum cuspidatum Sieb. et Zucc. The feasibility of this 2D strategy was verified with tyrosinase inhibition assay, α-glucosidase inhibition assay, DPPH radical scavenging assay, and ABTS•+ decolorization assay. Eight natural inhibitors were successfully pinpointed and identified from P. cuspidatum. Both pieceid-2″-O-gallate (10) and vanicoside B (20) were screened and identified as natural tyrosinase inhibitors for the first time. Meanwhile, vanicoside B (20) was also found as the strongest α-glucosidase inhibitor among all the isolated components. Most of the compounds exhibited much higher radical scavenging activities. Compared with traditional methodology based on one-dimensional chromatographic separation, the present 2D strategy would be more precise, efficient, and convenient to screen and separate bioactive compounds from complex matrices.
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Affiliation(s)
- Ping Xu
- College of Pharmaceutical Science, Zhejiang University of Technology, 310032 Hangzhou, China
| | - Xiang Wang
- Department of Pharmaceutical Analysis, China Pharmaceutical University, 210009 Nanjing, China
| | - Tingting Lin
- College of Pharmaceutical Science, Zhejiang University of Technology, 310032 Hangzhou, China
| | - Qingsong Shao
- Zhejiang Provincial Key Laboratory of Resources Protection and Innovation of Traditional Chinese Medicine, Zhejiang A&F University, 311300 Hangzhou, China
| | - Jianyun Peng
- Department of Nephrology, The Sixth Affiliated Hospital of Wenzhou Medical University Lishui People's Hospital, 323000 Lishui, China
| | - Chu Chu
- College of Pharmaceutical Science, Zhejiang University of Technology, 310032 Hangzhou, China
| | - Shengqiang Tong
- College of Pharmaceutical Science, Zhejiang University of Technology, 310032 Hangzhou, China
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Tian J, Shi Z, Wang G. Thermodynamic and Kinetic Binding Behaviors of Human Serum Albumin to Silver Nanoparticles. MATERIALS 2022; 15:ma15144957. [PMID: 35888425 PMCID: PMC9323290 DOI: 10.3390/ma15144957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 06/21/2022] [Accepted: 07/07/2022] [Indexed: 12/04/2022]
Abstract
A nanoparticle, under biological milieu, is inclined to be combined with various biomolecules, particularly protein, generating an interfacial corona which provides a new biological identity. Herein, the binding interaction between silver nanoparticles (AgNPs) and human serum albumin (HSA) was studied with transmission electron microscopy (TEM), circular dichroism (CD), and multiple spectroscopic techniques. Due to the ground state complex formed mainly through hydrophobic interactions, the fluorescence titration method proved that intrinsic fluorescence for HSA was probably statically quenched by AgNPs. The complete thermodynamic parameters were derived, indicating that the interaction between HSA and AgNPs is an entropy-driven process. Additionally, synchronous fluorescence and CD spectrum results suggested the conformational variation it has upon binding to AgNPs and the α-helix content has HSA visibly decreased. The kinetic experiments proved the double hysteresis effect has in HSA’s binding to the AgNPs surface. Moreover, the binding has between HSA and AgNPs follows the pseudo-second-order kinetic characteristic and fits the Freundlich model for multilayer adsorption. These results facilitate the comprehension about NPs’ underlying biological effects under a physiological environment and promote the secure applications of NPs biologically and medically.
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Affiliation(s)
- Jinjun Tian
- Biological and Chemical Engineering, Nanyang Institute of Technology, Nanyang 473004, China;
| | - Zhenghai Shi
- Biological and Chemical Engineering, Nanyang Institute of Technology, Nanyang 473004, China;
- Correspondence: (Z.S.); (G.W.)
| | - Gongke Wang
- School of Materials Science and Engineering, Henan Normal University, Xinxiang 453007, China
- Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China
- Correspondence: (Z.S.); (G.W.)
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4
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Chen M, Sun L, Ma Q, Yang J, Kang Q, Yang Y, Rong R. An affinity interaction guided two-dimensional separation system for the screening of neuraminidase inhibitors from Reynoutria japonica Houtt. roots. J Chromatogr A 2022; 1678:463338. [PMID: 35901666 DOI: 10.1016/j.chroma.2022.463338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 06/25/2022] [Accepted: 07/11/2022] [Indexed: 10/17/2022]
Abstract
Discovering bioactive compounds from medicinal herbs is crucial for drug discovery. Ultrafiltration is often used in the screening of bioactive compounds from natural herbs because of its simple and rapid operations. However, the ultrafiltration results are often disturbed by the undissolved compounds and the non-target compounds, which reduces the accuracy of the results. Herein, an affinity interaction guided two-dimensional (2D) separation system was developed. Discovery of the potential neuraminidase (NA) inhibitors from the dried roots of Reynoutria japonica Houtt. (RRJ) was used as an example. Only the small molecules showing affinity interaction with NA could be screened by the affinity interaction guided 2D separation system. Firstly, the NA and crude extract were incubated to form a sample solution (containing NA-inhibitor complexes, NA, and three types of small molecules with different polarities) by affinity interaction. Then the sample solution was separated and detected by the 2D separation system. This aimed to reduce the interference of the undissolved compounds and non-target compounds, and pick out the NA-inhibitor complexes (NA-Is). The collected NA-Is were denatured to release small molecular inhibitors (Is) for LC-MS/MS analysis. Compared with the ultrafiltration, more obvious peak area differences were observed in the results, and four potential NA inhibitors were successfully identified. In all, we provided a simple strategy with better performance in the screening of natural bioactive compounds.
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Affiliation(s)
- Menghan Chen
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, 250355, PR China
| | - Linlin Sun
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan, 250355, PR China
| | - Qingyun Ma
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, 250355, PR China
| | - Jia Yang
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, 250355, PR China
| | - Qianli Kang
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, 250355, PR China
| | - Yong Yang
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan, 250355, PR China; Collaborative Innovation Center for Antiviral Traditional Chinese Medicine in Shandong Province, Jinan, 250355, PR China.
| | - Rong Rong
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, 250355, PR China; Collaborative Innovation Center for Antiviral Traditional Chinese Medicine in Shandong Province, Jinan, 250355, PR China.
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5
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Muchiri RN, Kibitel J, Redick MA, van Breemen RB. Advances in Magnetic Microbead Affinity Selection Screening: Discovery of Natural Ligands to the SARS-CoV-2 Spike Protein. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2022; 33:181-188. [PMID: 34939787 PMCID: PMC9429804 DOI: 10.1021/jasms.1c00318] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Affinity selection-mass spectrometry, which includes magnetic microbead affinity selection-screening (MagMASS), is ideal for the discovery of ligands in complex mixtures that bind to pharmacological targets. Therapeutic agents are needed to prevent or treat COVID-19, which is caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Infection of human cells by SARS-CoV-2 involves binding of the virus spike protein subunit 1 (S1) to the human cell receptor angiotensin converting enzyme-2 (ACE2). Like antibodies, small molecules have the potential to block the interaction of the viral S1 protein with human ACE2 and prevent SARS-CoV-2 infection. Therefore, a MagMASS assay was developed for the discovery of ligands to the S1 protein. Unlike previous MagMASS approaches, this new assay used robotics for 5-fold enhancement of throughput and sensitivity. The assay was validated using the SBP-1 peptide, which is identical to the ACE2 amino acid sequence recognized by the S1 protein, and then applied to the discovery of natural ligands from botanical extracts. Small molecule ligands to the S1 protein were discovered in extracts of the licorice species, Glycyrrhiza inflata. In particular, the licorice ligand licochalcone A was identified through dereplication and comparison with standards using HPLC with high-resolution tandem mass spectrometry.
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Affiliation(s)
- Ruth N. Muchiri
- Linus Pauling Institute and College of Pharmacy, Oregon State University, Corvallis, OR 97331 USA
| | | | - Margaret A. Redick
- Linus Pauling Institute and College of Pharmacy, Oregon State University, Corvallis, OR 97331 USA
| | - Richard B. van Breemen
- Linus Pauling Institute and College of Pharmacy, Oregon State University, Corvallis, OR 97331 USA
- Corresponding author: 373 Linus Pauling Science Center, Corvallis, OR 97331 USA, TEL: 541-737-5080,
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Muchiri RN, van Breemen RB. Drug discovery from natural products using affinity selection-mass spectrometry. DRUG DISCOVERY TODAY. TECHNOLOGIES 2021; 40:59-63. [PMID: 34916024 DOI: 10.1016/j.ddtec.2021.10.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 10/08/2021] [Accepted: 10/11/2021] [Indexed: 12/22/2022]
Abstract
As a starting point for drug discovery, affinity selection-mass spectrometry (AS-MS) is ideal for the discovery of lead compounds from chemically diverse sources such as botanical, fungal and microbial extracts. Based on binding interactions between macromolecular receptors and ligands of low molecular mass, AS-MS enables the rapid isolation of pharmacologically active small molecules from complex mixtures for mass spectrometric characterization and identification. Unlike conventional high-throughput screening, AS-MS requires no radiolabels, no UV or fluorescent chromophores, and is compatible with all classes of receptors, enzymes, incubation buffers, cofactors, and ligands. The most successful types of AS-MS include pulsed ultrafiltration (PUF) AS-MS, size exclusion chromatography (SEC) AS-MS, and magnetic microbead affinity selection screening (MagMASS), which differ in their approaches for separating the ligand-receptor complexes from the non-binding compounds in mixtures. After affinity isolation, the ligand(s) from the mixture are characterized using high resolution UHPLC-MS and tandem mass spectrometry. Based on these elemental composition and structural data, the identities of the lead compounds are determined by searching on-line databases for known natural products and by comparison with standards. The structures of novel natural products are determined using a combination of spectroscopic techniques including two-dimensional NMR and MS.
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Affiliation(s)
- Ruth N Muchiri
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, United States; College of Pharmacy, Oregon State University, Corvallis, OR 97331, United States
| | - Richard B van Breemen
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, United States; College of Pharmacy, Oregon State University, Corvallis, OR 97331, United States
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Zhao X, Fu X, Yuan X, Shayiranbieke A, Xu R, Cao F, Ren J, Liang Q, Zhao X. Development and characterization of a selective chromatographic approach to the rapid discovery of ligands binding to muscarinic-3 acetylcholine receptor. J Chromatogr A 2021; 1653:462443. [PMID: 34365202 DOI: 10.1016/j.chroma.2021.462443] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 07/07/2021] [Accepted: 07/26/2021] [Indexed: 10/20/2022]
Abstract
The pursuit of new ligands binding to muscarinic-3 acetylcholine receptor (M3R) is viewed as challenging due to the lack of screening methods with high efficiency. To address such challenges, this work developed and characterized an approach to the rapid discovery of M3R ligands using the immobilized receptor as the chromatographic stationary phase. We fused haloalkane dehalogenase (Halo) as a tag at the C-terminus of M3R. The fusion M3R was immobilized on 6-chlorocaproic acid-activated ammino-microspheres by the specific covalent reaction between the Halo-tag and the linker. Comprehensive characterizations of the immobilized M3R were performed by scanning electron microscope, X-ray photoelectron spectroscopy, and the investigation on the binding of three specific ligands to the receptor. The feasibility of the immobilized M3R in complex matrices was tested by screening the bioactive compounds in Zhisou oral liquid, assessing the interaction between the screened compounds and the receptor using zonal elution, and evaluating the in vivo activity of the targeted compounds. The results evidenced that the immobilized M3R has high specificity, good stability, and the capacity to separate M3R ligands from complex matrices. These allowed us to identify naringin, hesperidin, liquiritigenin, platycodin D, and glycyrrhizic acid as the potential ligands of M3R. The association constants of the five compounds to M3R were 4.44 × 104, 1.11 × 104, 7.20 × 104, 4.15 × 104, and 3.36 × 104 M-1. The synergistic application of the five compounds exhibited an equivalent expectorant activity to the original formula. We reasoned that the current method is possible to provide a highly efficient strategy for the discovery of receptor ligands.
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Affiliation(s)
- Xue Zhao
- College of Life Sciences, Northwest University, Xi'an 710069, China
| | - Xiaoying Fu
- College of Life Sciences, Northwest University, Xi'an 710069, China
| | - Xinyi Yuan
- College of Life Sciences, Northwest University, Xi'an 710069, China
| | | | - Ru Xu
- College of Life Sciences, Northwest University, Xi'an 710069, China
| | - Fang Cao
- Shaanxi Pharmaceutical Holding Group Shanhaidan Pharmaceutical Co., Ltd., Xi'an 710075, China
| | - Jianping Ren
- Medicine Researchinstitution of Shaanxi Pharmaceutical Holding Cooperation, Xi'an 710065, China
| | - Qi Liang
- College of Life Sciences, Northwest University, Xi'an 710069, China.
| | - Xinfeng Zhao
- College of Life Sciences, Northwest University, Xi'an 710069, China.
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8
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Muchiri RN, van Breemen RB. Affinity selection-mass spectrometry for the discovery of pharmacologically active compounds from combinatorial libraries and natural products. JOURNAL OF MASS SPECTROMETRY : JMS 2021; 56:e4647. [PMID: 32955158 DOI: 10.1002/jms.4647] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 07/15/2020] [Accepted: 08/11/2020] [Indexed: 05/12/2023]
Abstract
Invented to address the high-throughput screening (HTS) demands of combinatorial chemistry, affinity selection-mass spectrometry (AS-MS) utilizes binding interactions between ligands and receptors to isolate pharmacologically active compounds from mixtures of small molecules and then relies on the selectivity, sensitivity, and speed of mass spectrometry to identify them. No radiolabels, fluorophores, or chromophores are required. Although many variations of AS-MS have been devised, three approaches have emerged as the most flexible, productive, and popular, and they differ primarily in how ligand-receptor complexes are separated from nonbinding compounds in the mixture. These are pulsed ultrafiltration (PUF) AS-MS, size exclusion chromatography (SEC) AS-MS, and magnetic microbead affinity selection screening (MagMASS). PUF and SEC AS-MS are solution-phase screening approaches, and MagMASS uses receptors immobilized on magnetic microbeads. Because pools of compounds are screened using AS-MS, each containing hundreds to thousands of potential ligands, hundreds of thousands of compounds can be screened per day. AS-MS is also compatible with complex mixtures of chemically diverse natural products in extracts of botanicals and fungi and microbial cultures, which often contain fluorophores and chromophores that can interfere with convention HTS. Unlike conventional HTS, AS-MS may be used to discover ligands binding to allosteric as well as orthosteric receptor sites, and AS-MS has been useful for discovering ligands to targets that are not easily incorporated into conventional HTS such as membrane-bound receptors.
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Affiliation(s)
- Ruth N Muchiri
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon, 97331, USA
| | - Richard B van Breemen
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon, 97331, USA
- Department of Pharmaceutical Sciences, Oregon State University, Corvallis, Oregon, 97331, USA
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9
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Screening cyclooxygenase-2 inhibitors from Andrographis paniculata to treat inflammation based on bio-affinity ultrafiltration coupled with UPLC-Q-TOF-MS. Fitoterapia 2019; 137:104259. [DOI: 10.1016/j.fitote.2019.104259] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 07/02/2019] [Accepted: 07/04/2019] [Indexed: 11/19/2022]
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Zhang C, Fu D, Chen G, Guo M. Comparative and chemometric analysis of correlations between the chemical fingerprints and anti-proliferative activities of ganoderic acids from three Ganoderma species. PHYTOCHEMICAL ANALYSIS : PCA 2019; 30:474-480. [PMID: 30932273 DOI: 10.1002/pca.2830] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 02/21/2019] [Accepted: 02/27/2019] [Indexed: 06/09/2023]
Abstract
INTRODUCTION Investigation on ganoderic acids (GAs) from different cultivars and origins of Ganoderma species, regarding to their composition, contents and bioactivities, will be of great importance for the development and quality control of Ganoderma-based healthcare products or drugs. OBJECTIVE Comparative and chemometric analysis of different Ganoderma species were conducted to reveal the correlations between their chemical fingerprints and anti-proliferative activities. METHODOLOGY Six Ganoderma samples with different origins and parts of fruiting body (pileus and stipe) were extracted with chloroform and enriched by a SPE-C18 cartridge. The eluents were used for high-performance liquid chromatography ultraviolet electrospray ionisation tandem mass spectrometry (HPLC-UV/ESI-MS/MS) analysis and cytotoxicity assay with three cancer cell lines (SGC-7901, HT-29 and Hep G2). Chemometric analysis was applied to correlate their chemical compositions and corresponding bioactivities. RESULTS Sixteen peaks (accounting for 70% of the total peak areas) were identified as GAs, and their contents ranged from 0.368 to 10.8 μg/g in various Ganoderma species. The extracts from three Ganoderma species had significant anti-proliferative activities (inhibitory rates ranged from 70.8% to 80.7%), and extracts from Lurongzhi showed remarkable inhibition to all three cancer cells (inhibitory rates range from 81.6% to 92.1%). Finally, chemometric analysis revealed that 3,7,12-trihydroxy-4,4,14-trimethyl-11,15-dioxochol-8-en-24-oic acid and 12-acetoxy-15-hydroxy-4,4,14-trimethyl-3,7,11-trioxochol-8-en-24-oic acid were the two compounds with most potential anti-proliferative activity for SGC-7901. CONCLUSION The correlations between chemical fingerprints and anti-proliferative activities of various Ganoderma species give remarkable insight into the true bioactive components of chemical markers for the quality assessment of the Ganoderma resources, and provide a good guidance for the study on the chemical spectrum-bioactivity relationship.
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Affiliation(s)
- Chunyun Zhang
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China
- The Sino-Africa Joint Research Centre, Chinese Academy of Sciences, Wuhan, China
| | - Dan Fu
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China
- Graduate University of Chinese Academy of Sciences, Beijing, China
| | - Guilin Chen
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China
- The Sino-Africa Joint Research Centre, Chinese Academy of Sciences, Wuhan, China
| | - Mingquan Guo
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China
- The Sino-Africa Joint Research Centre, Chinese Academy of Sciences, Wuhan, China
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11
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Fu Y, Luo J, Qin J, Yang M. Screening techniques for the identification of bioactive compounds in natural products. J Pharm Biomed Anal 2019; 168:189-200. [PMID: 30825802 DOI: 10.1016/j.jpba.2019.02.027] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 02/14/2019] [Accepted: 02/18/2019] [Indexed: 01/06/2023]
Abstract
Natural products (NPs) have a long history of clinical use and are rich source of bioactive compounds. The development of tools and techniques for identifying and analyzing NP bioactive compounds to ensure their quality and discover new drugs is thus very important and still in demand. Screening techniques have proven highly useful for screening and analyzing active components in complex mixtures, which rely on cell culture, dialysis, ultrafiltration, chromatographic methods and target molecule immobilization, using biological targets to identify the active compounds. The recent progress in biological screening techniques in the field of natural products is reviewed here. This includes a review on the strategy and application of the screening methods, their detailed description and discussion of their existing limitations of the different models along with prospective in future development of screening techniques.
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Affiliation(s)
- Yanwei Fu
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, 100193, China
| | - Jiaoyang Luo
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, 100193, China
| | - Jiaan Qin
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, 100193, China
| | - Meihua Yang
- Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, 100193, China.
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12
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Yang XX, Gu W, Liang L, Yan HL, Wang YF, Bi Q, Zhang T, Yu J, Rao GX. Screening for the bioactive constituents of traditional Chinese medicines—progress and challenges. RSC Adv 2017. [DOI: 10.1039/c6ra25765h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The search for lead compounds from traditional Chinese medicines (TCMs) may be promising for new drug development.
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Affiliation(s)
- Xing-Xin Yang
- College of Pharmaceutical Science
- Yunnan University of Traditional Chinese Medicine
- Kunming 650500
- P. R. China
| | - Wen Gu
- College of Pharmaceutical Science
- Yunnan University of Traditional Chinese Medicine
- Kunming 650500
- P. R. China
| | - Li Liang
- College of Pharmaceutical Science
- Yunnan University of Traditional Chinese Medicine
- Kunming 650500
- P. R. China
| | - Hong-Li Yan
- College of Pharmaceutical Science
- Yunnan University of Traditional Chinese Medicine
- Kunming 650500
- P. R. China
| | - Yan-Fang Wang
- College of Pharmaceutical Science
- Yunnan University of Traditional Chinese Medicine
- Kunming 650500
- P. R. China
| | - Qian Bi
- College of Pharmaceutical Science
- Yunnan University of Traditional Chinese Medicine
- Kunming 650500
- P. R. China
| | - Ting Zhang
- College of Pharmaceutical Science
- Yunnan University of Traditional Chinese Medicine
- Kunming 650500
- P. R. China
| | - Jie Yu
- College of Pharmaceutical Science
- Yunnan University of Traditional Chinese Medicine
- Kunming 650500
- P. R. China
- Engineering Laboratory for National Healthcare Theories and Products of Yunnan Province
| | - Gao-Xiong Rao
- College of Pharmaceutical Science
- Yunnan University of Traditional Chinese Medicine
- Kunming 650500
- P. R. China
- Engineering Laboratory for National Healthcare Theories and Products of Yunnan Province
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13
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Rush MD, Walker EM, Burton T, van Breemen RB. Magnetic Microbead Affinity Selection Screening (MagMASS) of Botanical Extracts for Inhibitors of 15-Lipoxygenase. JOURNAL OF NATURAL PRODUCTS 2016; 79:2898-2902. [PMID: 27802026 PMCID: PMC5148709 DOI: 10.1021/acs.jnatprod.6b00693] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
To expedite the identification of active natural products in complex mixtures such as botanical extracts, a magnetic microbead affinity selection screening (MagMASS) procedure was developed. This technique utilizes target proteins immobilized on magnetic beads for rapid bioaffinity isolation of ligands from complex mixtures. A MagMASS method was developed and validated for 15-lipoxygenase. As a proof of concept, several North American prairie plants used medicinally by Native Americans were extracted with MeOH and screened. A hit from an extract of Proserpinaca palustris, also known as mermaid weed, was flagged for further characterization using high-resolution tandem mass spectrometry, dereplication, and identification using XCMS online. Through the application of high-resolution product ion tandem mass spectrometry, comparison with natural product databases, and confirmation using standards, the hit was identified as quercitrin, which is a known inhibitor of 15-lipoxygenase. The overall workflow of MagMASS is faster and more amendable to automation than alternative methods designed for screening botanical extracts or complex mixtures of combinatorial libraries.
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Affiliation(s)
| | | | | | - Richard B. van Breemen
- Corresponding Author: Richard B. van Breemen, UIC/NIH Center for Botanical Dietary Supplements Research, University of Illinois College of Pharmacy, 833 S. Wood Street, Chicago, IL 60612, United States, Telephone: 312-996-9353,
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Song H, Wang H, Liang J, Qian C, Wu S, Xu W, Wu B, Liu X, Li P, Yang H. Integration of Multiple Analytical and Computational Tools for the Discovery of High‐Potency Enzyme Inhibitors from Herbal Medicines. ChemMedChem 2016; 11:2588-2597. [DOI: 10.1002/cmdc.201600489] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Indexed: 12/21/2022]
Affiliation(s)
- Hui‐Peng Song
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Hong Wang
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Jin‐Xiu Liang
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Cheng Qian
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Si‐Qi Wu
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Wen‐Jun Xu
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Bin Wu
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Xin‐Guang Liu
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Ping Li
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
| | - Hua Yang
- State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China
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Wei H, Zhang X, Tian X, Wu G. Pharmaceutical applications of affinity-ultrafiltration mass spectrometry: Recent advances and future prospects. J Pharm Biomed Anal 2016; 131:444-453. [PMID: 27668554 DOI: 10.1016/j.jpba.2016.09.021] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 09/06/2016] [Accepted: 09/20/2016] [Indexed: 11/17/2022]
Abstract
The immunoaffinity of protein with ligand is broadly involved in many bioanalytical methods. Affinity-ultrafiltration mass spectrometry (AUF-MS), a platform based on interaction of protein-ligand affinity, has been developed to fish out interesting molecules from complex matrixes. Here we reviewed the basics of AUF-MS and its recent applications to pharmaceutical field, i.e. target-oriented discovery of lead compounds from combinatorial libraries and natural product extracts, and determination of free drug concentration in biosamples. Selected practical examples were highlighted to illustrate the advances of AUF-MS in pharmaceutical fields. The future prospects were also presented.
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Affiliation(s)
- Han Wei
- Department of Pharmacy, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China.
| | - Xiaojian Zhang
- Department of Pharmacy, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Xin Tian
- Department of Pharmacy, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Guanghua Wu
- Department of Pharmacy, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
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16
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De-qiang L, Zhao J, Wu D, Shao-ping L. Discovery of active components in herbs using chromatographic separation coupled with online bioassay. J Chromatogr B Analyt Technol Biomed Life Sci 2016; 1021:81-90. [DOI: 10.1016/j.jchromb.2016.02.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 01/19/2016] [Accepted: 02/03/2016] [Indexed: 11/30/2022]
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Immobilization of Cyclooxygenase-2 on Silica Gel Microspheres: Optimization and Characterization. Molecules 2015; 20:19971-83. [PMID: 26556331 PMCID: PMC6332325 DOI: 10.3390/molecules201119670] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 08/28/2015] [Indexed: 01/05/2023] Open
Abstract
In this study, immobilized COX-2 was successfully constructed through glutaraldehyde-mediated covalent coupling on functional silica gel microspheres. The optimum conditions, properties, and morphological characteristics of the immobilized COX-2 were investigated. The optimal immobilization process was as follows: about 0.02 g of aminated silica gel microspheres was activated by 0.25% GA solution for 6 h and mixed with 5 U of free recombinant COX-2 solution. Then, the mixture was shaken for 8 h at 20 °C. Results showed that the immobilized COX-2 produced by this method exhibited excellent biocatalytic activity, equivalent to that of free COX-2 under the test conditions employed. The best biocatalytic activity of immobilized COX-2 appeared at pH 8.0 and still maintained at about 84% (RSD < 7.39%, n = 3) at pH 10.0. For temperature tolerance, immobilized COX-2 exhibited its maximum biocatalytic activity at 40 °C and about 68% (RSD < 6.99%, n = 3) of the activity was maintained at 60 °C. The immobilized COX-2 retained over 85% (RSD < 7.26%, n = 3) of its initial biocatalytic activity after five cycles, and after 10 days storage, the catalytic activity of immobilized COX-2 still maintained at about 95% (RSD < 3.08%, n = 3). These characteristics ensured the convenient use of the immobilized COX-2 and reduced its production cost.
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Fabrication of enzyme-immobilized halloysite nanotubes for affinity enrichment of lipase inhibitors from complex mixtures. J Chromatogr A 2015; 1392:20-7. [PMID: 25798866 DOI: 10.1016/j.chroma.2015.03.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 02/28/2015] [Accepted: 03/02/2015] [Indexed: 11/23/2022]
Abstract
Lipase is the key enzyme for catalyzing triglyceride hydrolysis in vivo, and lipase inhibitors have been used in the management of obesity. We present the first report on the use of lipase-adsorbed halloysite nanotubes as an efficient medium for the selective enrichment of lipase inhibitors from natural products. A simple and rapid approach was proposed to fabricate lipase-adsorbed nanotubes through electrostatic interaction. Results showed that more than 85% lipase was adsorbed into nanotubes in 90 min, and approximately 80% of the catalytic activity was maintained compared with free lipase. The specificity and reproducibility of the proposed approach were validated by screening a known lipase inhibitor (i.e., orlistat) from a mixture that contains active and inactive compounds. Moreover, we applied this approach with high performance liquid chromatography-mass spectrometry technique to screen lipase inhibitors from the Magnoliae cortex extract, a medicinal plant used for treating obesity. Two novel biphenyl-type natural lipase inhibitors magnotriol A and magnaldehyde B were identified, and their IC50 values were determined as 213.03 and 96.96 μM, respectively. The ligand-enzyme interactions of magnaldehyde B were further investigated by molecular docking. Our findings proved that enzyme-adsorbed nanotube could be used as a feasible and selective affinity medium for the rapid screening of enzyme inhibitors from complex mixtures.
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Zhu H, Zhuang X, Liu S, Pi Z, Song F, Lin N, Liu Z. Ultrahigh-performance liquid chromatography/tandem mass spectrometry method for evaluating enzyme activity and screening inhibitors of cyclooxygenase-2. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2014; 28:1792-1800. [PMID: 25559449 DOI: 10.1002/rcm.6963] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2014] [Revised: 05/25/2014] [Accepted: 06/10/2014] [Indexed: 06/04/2023]
Abstract
RATIONALE Prostaglandin E2 is an important biomarker in many biological systems. The development of sensitive and reliable analytical methods for monitoring PGE2 contents in various samples is of great interest. Here we developed an improved method for evaluating the enzyme activity and screening COX-2 inhibitors using ultrahigh-performance liquid chromatography/tandem mass spectrometry (UPLC/MS/MS) combined with PGE2 derivatization. METHODS Girard's reagent-T was used as the derivatization reagent and the reaction conditions were optimized. The established method was performed to screen the COX-2 inhibitors from effective constituents of herbs and detect the concentration of PGE2 in biological tissue samples (liver and kidney). The IC50 values of celecoxib, rofecoxib, sinomenine, bulleyaconitine A, tetrandrine, fangchinoline, berberine hydrochloride and sophocarpidine towards COX-2 were determined. RESULTS This method improves the quantitative ability for PGE2 , including the linearly dependent coefficient, linearity range and limit of detection. After derivatization, the derivatized PGE2 could be detected in positive ion mode of electrospray ionization (ESI), which improves the detection sensitivity 10-fold compared to that of the direct detection of underivatized PGE2 in negative ESI mode. Besides the positive control, sinomenine (IC50 =113 μM) and bulleyaconitine A (IC50=53 μM) were found to be potent COX-2 inhibitors. CONCLUSIONS All the results indicate that the present derivatization quantification method of PGE2 could be used as the detection method of COX-2 enzyme activity and as the screening method for COX-2 inhibitors.
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Affiliation(s)
- Hongbin Zhu
- National Center of Mass Spectrometry in Changchun & Jilin Province Key Laboratory of Chinese Medicine Chemistry and Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China; University of the Chinese Academy of Sciences, Beijing, 100039, China
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Song HP, Zhang H, Fu Y, Mo HY, Zhang M, Chen J, Li P. Screening for selective inhibitors of xanthine oxidase from Flos Chrysanthemum using ultrafiltration LC–MS combined with enzyme channel blocking. J Chromatogr B Analyt Technol Biomed Life Sci 2014; 961:56-61. [DOI: 10.1016/j.jchromb.2014.05.001] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 03/31/2014] [Accepted: 05/04/2014] [Indexed: 01/09/2023]
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21
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Affinity selection-based two-dimensional chromatography coupled with high-performance liquid chromatography-mass spectrometry for discovering xanthine oxidase inhibitors from Radix Salviae Miltiorrhizae. Anal Bioanal Chem 2014; 406:4987-95. [DOI: 10.1007/s00216-014-7902-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 05/12/2014] [Accepted: 05/14/2014] [Indexed: 01/03/2023]
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22
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Li B, Zong X, Zhang H, Zhao A, Li L, Tsao R, Liu J. SCREENING AND STRUCTURAL CHARACTERIZATION OF MMP-2 INHIBITOR FROM CARTHAMUS TINCTORIUS L. USING ULTRAFILTRATION LIQUID CHROMATOGRAPHY–MASS SPECTROMETRY. J LIQ CHROMATOGR R T 2014. [DOI: 10.1080/10826076.2013.830272] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Bo Li
- a The College of Chemistry, Changchun Normal University , Changchun , China
| | - Xiaofei Zong
- a The College of Chemistry, Changchun Normal University , Changchun , China
| | - Huirong Zhang
- a The College of Chemistry, Changchun Normal University , Changchun , China
| | - Anqi Zhao
- a The College of Chemistry, Changchun Normal University , Changchun , China
| | - Li Li
- a The College of Chemistry, Changchun Normal University , Changchun , China
| | - Rong Tsao
- b Guelph Food Research Center, Agriculture and Agri-Food Canada , Guelph , Ontario , Canada
| | - Jianjun Liu
- c Agricultural Technical Extension Station , Singping , China
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Simithy J, Reeve N, Hobrath JV, Reynolds RC, Calderón AI. Identification of shikimate kinase inhibitors among anti-Mycobacterium tuberculosis compounds by LC-MS. Tuberculosis (Edinb) 2014; 94:152-8. [DOI: 10.1016/j.tube.2013.12.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Revised: 12/14/2013] [Accepted: 12/19/2013] [Indexed: 11/27/2022]
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24
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Bioactivity fingerprint analysis of cyclooxygenase-2 ligands from radix Aconiti by ultrafiltration–UPLC–MSn. Anal Bioanal Chem 2013; 405:7437-45. [DOI: 10.1007/s00216-013-7153-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Revised: 06/15/2013] [Accepted: 06/17/2013] [Indexed: 01/08/2023]
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25
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Hollow fiber based affinity selection combined with high performance liquid chromatography–mass spectroscopy for rapid screening lipase inhibitors from lotus leaf. Anal Chim Acta 2013; 785:75-81. [DOI: 10.1016/j.aca.2013.04.058] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2012] [Revised: 04/20/2013] [Accepted: 04/28/2013] [Indexed: 11/21/2022]
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26
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Luo L, Shen L, Sun F, Ma Z. Immunoprecipitation coupled with HPLC–MS/MS to discover the aromatase ligands from Glycyrrhiza uralensis. Food Chem 2013; 138:315-20. [DOI: 10.1016/j.foodchem.2012.10.043] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2011] [Revised: 10/31/2011] [Accepted: 10/06/2012] [Indexed: 10/27/2022]
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27
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Lavecchia A, Di Giovanni C, Cerchia C, Russo A, Russo G, Novellino E. Discovery of a novel small molecule inhibitor targeting the frataxin/ubiquitin interaction via structure-based virtual screening and bioassays. J Med Chem 2013; 56:2861-73. [PMID: 23506486 DOI: 10.1021/jm3017199] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Friedreich's ataxia (FRDA) is an autosomal recessive neuro- and cardiodegenerative disorder for which there are no proven effective treatments. FRDA is caused by decreased expression and/or function of the mitochondrial protein frataxin. Here, we report findings that frataxin is degraded via the ubiquitin-proteasomal pathway and that it is ubiquitinated at residue K(147) in Calu-6 cells. A theoretical model of the frataxin-K(147)/Ub complex, constructed by combining bioinformatics interface predictions with information-driven docking, revealed a hitherto unnoticed, potential ubiquitin-binding domain in frataxin. Through structure-based virtual screening and cell-based assays, we discovered a novel small molecule (compound (+)-11) able to prevent frataxin ubiquitination and degradation. (+)-11 was synthesized and tested for specific binding to frataxin by an UF-LC/MS based ligand-binding assay. Follow-up scaffold-based searches resulted in the identification of a lead series with micromolar activity in disrupting the frataxin/Ub interaction. This study also suggests that frataxin could be a potential target for FRDA drug development.
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Affiliation(s)
- Antonio Lavecchia
- Dipartimento di Chimica Farmaceutica e Tossicologica, Drug Discovery Laboratory, Università di Napoli Federico II, Via Domenico Montesano 49, 80131 Napoli, Italy.
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Liu Y, Liu S, Liu Z. Screening and determination of potential xanthine oxidase inhibitors from Radix Salviae Miltiorrhizae using ultrafiltration liquid chromatography–mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2013; 923-924:48-53. [DOI: 10.1016/j.jchromb.2013.02.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 02/03/2013] [Accepted: 02/06/2013] [Indexed: 11/29/2022]
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29
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Potterat O, Hamburger M. Concepts and technologies for tracking bioactive compounds in natural product extracts: generation of libraries, and hyphenation of analytical processes with bioassays. Nat Prod Rep 2013; 30:546-64. [DOI: 10.1039/c3np20094a] [Citation(s) in RCA: 102] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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30
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Non-covalent binding of proteins to polyphenols correlates with their amino acid sequence. Food Chem 2012; 132:1333-1339. [DOI: 10.1016/j.foodchem.2011.11.113] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 10/13/2011] [Accepted: 11/28/2011] [Indexed: 11/20/2022]
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31
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Zhou H, Li H, Zheng Z, Song F, Xing J, Liu Z, Liu S. SCREENING FOR α-GLUCOSIDASE INHIBITORS FROM COPTIDIS-REHMANNIAE HERB COUPLE BY USING ULTRAFILTRATION LIQUID CHROMATOGRAPHY/MASS SPECTROMETRY. J LIQ CHROMATOGR R T 2012. [DOI: 10.1080/10826076.2011.593225] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Hui Zhou
- a Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , P.R. China
- b Graduate School of Chinese Academy of Sciences , Beijing , P.R. China
| | - Huilin Li
- a Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , P.R. China
| | - Zhong Zheng
- a Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , P.R. China
| | - Fengrui Song
- a Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , P.R. China
| | - Junpeng Xing
- a Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , P.R. China
| | - Zhiqiang Liu
- a Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , P.R. China
| | - Shuying Liu
- a Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , P.R. China
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Functional proteomics: application of mass spectrometry to the study of enzymology in complex mixtures. Anal Bioanal Chem 2011; 402:625-45. [PMID: 21769551 DOI: 10.1007/s00216-011-5236-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Revised: 06/30/2011] [Accepted: 07/04/2011] [Indexed: 12/19/2022]
Abstract
This review covers recent developments in mass spectrometry-based applications dealing with functional proteomics with special emphasis on enzymology. The introduction of mass spectrometry into this research field has led to an enormous increase in knowledge in recent years. A major challenge is the identification of "biologically active substances" in complex mixtures. These biologically active substances are, on the one hand, potential regulators of enzymes. Elucidation of function and identity of those regulators may be accomplished by different strategies, which are discussed in this review. The most promising approach thereby seems to be the one-step procedure, because it enables identification of the functionality and identity of biologically active substances in parallel and thus avoids misinterpretation. On the other hand, besides the detection of regulators, the identification of endogenous substrates for known enzymes is an emerging research field, but in this case studies are quite rare. Moreover, the term biologically active substances may also encompass proteins with diverse biological functions. Elucidation of the functionality of those-so far unknown-proteins in complex mixtures is another branch of functional proteomics and those investigations will also be discussed in this review.
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van Breemen RB, Tao Y, Li W. Cyclooxygenase-2 inhibitors in ginger (Zingiber officinale). Fitoterapia 2011; 82:38-43. [PMID: 20837112 PMCID: PMC3018740 DOI: 10.1016/j.fitote.2010.09.004] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2010] [Accepted: 09/04/2010] [Indexed: 01/03/2023]
Abstract
Ginger roots have been used to treat inflammation and have been reported to inhibit cyclooxygenase (COX). Ultrafiltration liquid chromatography mass spectrometry was used to screen a chloroform partition of a methanol extract of ginger roots for COX-2 ligands, and 10-gingerol, 12-gingerol, 8-shogaol, 10-shogaol, 6-gingerdione, 8-gingerdione, 10-gingerdione, 6-dehydro-10-gingerol, 6-paradol, and 8-paradol bound to the enzyme active site. Purified 10-gingerol, 8-shogaol and 10-shogaol inhibited COX-2 with IC(50) values of 32 μM, 17.5 μM and 7.5 μM, respectively. No inhibition of COX-1 was detected. Therefore, 10-gingerol, 8-shogaol and 10-shogaol inhibit COX-2 but not COX-1, which can explain, in part, the anti-inflammatory properties of ginger.
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Affiliation(s)
- Richard B van Breemen
- Department of Medicinal Chemistry and Pharmacognosy, University of Illinois College of Pharmacy, Chicago, IL 60612, USA.
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34
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Choi Y, Jermihov K, Nam SJ, Sturdy M, Maloney K, Qiu X, Chadwick LR, Main M, Chen SN, Mesecar AD, Farnsworth NR, Pauli GF, Fenical W, Pezzuto JM, van Breemen RB, van Breemen RR. Screening natural products for inhibitors of quinone reductase-2 using ultrafiltration LC-MS. Anal Chem 2010; 83:1048-52. [PMID: 21192729 DOI: 10.1021/ac1028424] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Inhibitors of quinone reductase-2 (NQO2; QR-2) can have antimalarial activity and antitumor activities or can function as chemoprevention agents by preventing the metabolic activation of toxic quinones such as menadione. To expedite the search for new natural product inhibitors of QR-2, we developed a screening assay based on ultrafiltration liquid chromatography-mass spectrometry that is compatible with complex samples such as bacterial or botanical extracts. Human QR-2 was prepared recombinantly, and the known QR-2 inhibitor, resveratrol, was used as a positive control and as a competitive ligand to eliminate false positives. Ultrafiltration LC-MS screening of extracts of marine sediment bacteria resulted in the discovery of tetrangulol methyl ether as an inhibitor of QR-2. When applied to the screening of hop extracts from the botanical, Humulus lupulus L., xanthohumol and xanthohumol D were identified as ligands of QR-2. Inhibition of QR-2 by these ligands was confirmed using a functional enzyme assay. Furthermore, binding of xanthohumol and xanthohumol D to the active site of QR-2 was confirmed using X-ray crystallography. Ultrafiltration LC-MS was shown to be a useful assay for the discovery of inhibitors of QR-2 in complex matrixes such as extracts of bacteria and botanicals.
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Affiliation(s)
- Yongsoo Choi
- Department of Medicinal Chemistry and Pharmacognosy, University of Illinois College of Pharmacy, Chicago, Illinois 60612, USA
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Characterization of aromatase binding agents from the dichloromethane extract of Corydalis yanhusuo using ultrafiltration and liquid chromatography tandem mass spectrometry. Molecules 2010; 15:3556-66. [PMID: 20657498 PMCID: PMC6263280 DOI: 10.3390/molecules15053556] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2010] [Revised: 05/05/2010] [Accepted: 05/11/2010] [Indexed: 11/18/2022] Open
Abstract
Aromatase represents an important target for the treatment of hormone-dependent breast cancer. In the present study, nine alkaloids from the dichloromethane extract of Corydalis yanhusuo were identified by liquid chromatography tandem mass spectrometry (LC-MS/MS) and tested for their aromatase binding activities using an ultrafiltration LC-MS method by investigating the differences of peak areas of compounds before and after incubations with aromatase. It was demonstrated that the quaternary protoberberine alkaloids and the tertiary protoberberine alkaloids exhibited potent aromatase binding activities. The quaternary ammonium group and the methyl group at C-13 position of tertiary protoberberine alkaloids might be necessary for the activity. The findings should provide guidance for the discovery of potential aromatase inhibitors from natural products.
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36
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Mulabagal V, Calderón AI. Development of an Ultrafiltration-Liquid Chromatography/Mass Spectrometry (UF-LC/MS) Based Ligand-Binding Assay and an LC/MS Based Functional Assay for Mycobacterium tuberculosis Shikimate Kinase. Anal Chem 2010; 82:3616-21. [DOI: 10.1021/ac902849g] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vanisree Mulabagal
- Department of Pharmacal Sciences, Harrison School of Pharmacy, 4306B Walker Building, Auburn University, Auburn, Alabama 36849
| | - Angela I. Calderón
- Department of Pharmacal Sciences, Harrison School of Pharmacy, 4306B Walker Building, Auburn University, Auburn, Alabama 36849
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Development of binding assays to screen ligands for Plasmodium falciparum thioredoxin and glutathione reductases by ultrafiltration and liquid chromatography/mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2010; 878:987-93. [DOI: 10.1016/j.jchromb.2010.02.030] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2009] [Revised: 02/24/2010] [Accepted: 02/25/2010] [Indexed: 11/20/2022]
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38
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Cao H, Yu R, Choi Y, Ma ZZ, Zhang H, Xiang W, Lee DYW, Berman BM, Moudgil KD, Fong HHS, van Breemen RB. Discovery of cyclooxygenase inhibitors from medicinal plants used to treat inflammation. Pharmacol Res 2010; 61:519-24. [PMID: 20188172 DOI: 10.1016/j.phrs.2010.02.007] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Revised: 02/16/2010] [Accepted: 02/17/2010] [Indexed: 11/28/2022]
Abstract
Eleven authenticated botanicals used in the traditional Chinese medicine Huo-Luo-Xiao-Ling Dan were screened for ligands to cyclooxygenase (COX) using pulsed ultrafiltration liquid chromatography-mass spectrometry, and a mass spectrometry-based enzyme assay was used to determine the concentration of each of 17 ligands that inhibited COX-1 or COX-2 by 50% (IC(50)). Acetyl-11-keto-beta-boswellic acid, beta-boswellic acid, acetyl-alpha-boswellic acid, acetyl-beta-boswellic acid, and betulinic acid were COX-1 selective inhibitors with IC(50) values of approximately 10 microM. Senkyunolide O and cryptotanshinone were COX-2 selective inhibitors with IC(50) values of 5 microM and 22 microM, respectively. Roburic acid and phenethyl-trans-ferulate inhibited COX-1 and COX-2 equally. COX inhibition and the IC(50) values of most of these natural product ligands have not been reported previously.
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Affiliation(s)
- Hongmei Cao
- Department of Medicinal Chemistry and Pharmacognosy, University of Illinois College of Pharmacy, 833 S. Wood Street, Chicago, IL, USA
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39
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Vu H, Pham NB, Quinn RJ. Direct screening of natural product extracts using mass spectrometry. ACTA ACUST UNITED AC 2008; 13:265-75. [PMID: 18349420 DOI: 10.1177/1087057108315739] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The authors describe first a proof-of-concept experiment to show direct affinity screening using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI-FTICR-MS) is a rapid and informative approach for natural product extract screening. The study used 10 alkaloid-enriched plant extracts and 8 desalted marine extracts spiked with specific inhibitors of bovine carbonic anhydrase II (bCAII; EC4.2.1.1) as a model set. The spiked extracts were incubated with bCAII and then analyzed by ESI-FTICR-MS. The noncovalent complexes were detected, and the specific inhibitors were reidentified in the spiked natural product extracts. There was no interference from the desalted/alkaloid-enriched extracts to the formation of the noncovalent complexes. The method allowed quick identification of the molecular mass of the bound ligand. The authors then applied the screening to identify active compounds in natural product extracts. They employed direct infusion and online size exclusion chromatography (SEC) ESI-FTICR-MS to detect intact target-ligand complex. Eighty-five methanolic plant extracts were screened against bCAII by direct infusion ESI-FTICR-MS and by online SEC-ESI-FTICR-MS. One noncovalent complex was identified from the same plant extract by both methods. The molecular weight of the bound ligand from this extract was determined. Mass-directed purification gave 6-(1S-hydroxy-3-methylbutyl)-7-methoxy-2H-chromen-2-one (1) as the active compound. Subsequently, the binding to bCAII was confirmed by ESI-FTICR-MS. The binding specificity was determined by competition experiments between 1 and furosemide, a specific ligand of bCAII.
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Affiliation(s)
- Hoan Vu
- Eskitis Institute, Griffith University, Brisbane, Queensland, Australia
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40
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Liu D, Guo J, Luo Y, Broderick DJ, Schimerlik MI, Pezzuto JM, van Breemen RB. Screening for ligands of human retinoid X receptor-alpha using ultrafiltration mass spectrometry. Anal Chem 2007; 79:9398-402. [PMID: 17997524 DOI: 10.1021/ac701701k] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Retinoid X receptors (RXRs) function as ligand-activated transcription factors and are obligatory components of a large number of nuclear receptor heterodimers. RXRs help regulate diverse physiological responses including the cancer prevention responses of cell proliferation, inflammation, cell differentiation, and apoptosis. Since RXRs represent important targets for cancer chemoprevention, an ultrafiltration mass spectrometry-based assay was developed to facilitate the discovery of potential chemoprevention agents that bind to human RXRalpha. Natural and synthetic ligands for RXRalpha including 9-cis-retinoic acid, docosahexaenoic acid, and LG100268 could be detected and identified in DMSO (dimethyl sulfoxide) or even complex matrixes such as extracts of marine bacteria. Specific binding of ligands to RXRalpha was demonstrated through competitive binding using ultrafiltration LC-MS/MS (liquid chromatography-tandem mass spectrometry), and ligands could be ranked in order of affinity for RXRalpha. Therefore, ultrafiltration LC-MS/MS is suitable for the screening of complex mixtures such as natural product extracts for the discovery of new ligands to RXRalpha.
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Affiliation(s)
- Dongting Liu
- Department of Medicinal Chemistry and Pharmacognosy, University of Illinois College of Pharmacy, 833 South Wood Street, Chicago, Illinois 60612, USA
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41
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de Boer AR, Lingeman H, Niessen WM, Irth H. Mass spectrometry-based biochemical assays for enzyme-inhibitor screening. Trends Analyt Chem 2007. [DOI: 10.1016/j.trac.2007.08.004] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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42
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de Boer AR, Alcaide-Hidalgo JM, Krabbe JG, Kolkman J, van Emde Boas CN, Niessen WMA, Lingeman H, Irth H. High-Temperature Liquid Chromatography Coupled On-Line to a Continuous-Flow Biochemical Screening Assay with Electrospray Ionization Mass Spectrometric Detection. Anal Chem 2005; 77:7894-900. [PMID: 16351135 DOI: 10.1021/ac0510282] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The potential of high-temperature liquid chromatography (HTLC) was investigated in an on-line combination with a screening system for bioactive compounds against the enzyme cathepsin B. Samples were separated by HTLC and subsequently analyzed by an on-line continuous-flow enzymatic assay. Detection was performed by electrospray ionization mass spectrometry, revealing both the bioactivity and the molecular mass of the bioactive compounds. Compared to conventional reversed-phase liquid chromatography, the amount of methanol necessary for separation could be decreased to only 10%, which improved the compatibility of LC with a biochemical assay. Sufficient preheating of the mobile phase prior to the separation and postcolumn cooling to prevent deactivation of the enzyme, even at column temperatures as high as 208 degrees C, was achieved as indicated by the reliable peak shapes obtained. The sensitivity was comparable with previously described systems operating at ambient temperatures as similar IC50 values were obtained. Exposing the inhibitors to high temperatures did not lead to thermal decomposition. The separation of inhibitors and the subsequent biochemical assay was performed either isothermally at various temperatures or by applying various temperature gradients as well as at various flow rates. The results obtained clearly show the compatibility of HTLC with an enzymatic screening assay.
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Affiliation(s)
- Arjen R de Boer
- Faculty of Sciences, Department of Chemistry and Pharmaceutical Sciences, Section of Analytical Chemistry & Applied Spectroscopy, Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands.
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Sun Y, Gu C, Liu X, Liang W, Yao P, Bolton JL, van Breemen RB. Ultrafiltration tandem mass spectrometry of estrogens for characterization of structure and affinity for human estrogen receptors. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2005; 16:271-9. [PMID: 15694777 PMCID: PMC1780173 DOI: 10.1016/j.jasms.2004.11.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2004] [Revised: 11/01/2004] [Accepted: 11/03/2004] [Indexed: 05/07/2023]
Abstract
Although hormone replacement therapy (HRT) is used by post-menopausal women for the relief of menopausal symptoms and the potential reduction of osteoporosis, HRT also increases their risk of Alzheimer's disease, stroke, breast cancer, and endometrial cancer. Since the majority of these effects are associated primarily with estrogen binding to only one of the estrogen receptors (ER), new assays are needed that can more efficiently evaluate ER-binding and identify ligands selective for ER-alpha and ER-beta. High performance liquid chromatography-tandem mass spectrometry (LC-MS-MS) was combined with ultrafiltration as a new method to investigate the relative binding of compounds to the ERs and to evaluate the structures of these estrogens. Mixtures of estradiol and six equine estrogens, including equilin, equilenin, 8,9-dehydroestrone, and their 17beta-hydroxyl derivatives, were assayed simultaneously to determine their relative binding to human ER-alpha and ER-beta. Estrogens containing a 17beta-OH group were found to have higher relative affinities for the estrogen receptors than their ketone analogs. In addition, 17beta-EN showed selectivity for binding to ER-beta over ER-alpha. The results were compared to the IC50 values obtained by using a conventional radiolabled estradiol competitive binding assay. Finally, the utility of negative ion electrospray tandem mass spectrometry for the unambiguous identification of these estrogen isomers was investigated. Several characteristic recyclization pathways during tandem mass spectrometry were identified, which might be useful for distinguishing related estrogens.
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Affiliation(s)
- Yongkai Sun
- Department of Medical Chemistry and Pharmacognosy, The University of Illinois College of Pharmacy, Chicago, Illinois 60612, USA
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Seger C, Sturm S, Stuppner H, Butt TM, Strasser H. Combination of a new sample preparation strategy with an accelerated high-performance liquid chromatography assay with photodiode array and mass spectrometric detection for the determination of destruxins from Metarhizium anisopliae culture broth. J Chromatogr A 2004; 1061:35-43. [PMID: 15633742 DOI: 10.1016/j.chroma.2004.10.063] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A method is presented allowing the qualitative and quantitative analysis of destruxins (dtxs) in fungal culture broth. Sample preparation was carried out by ultrafiltration over a commercially available acetylated cellulose (CTA) membrane with a Mr 10000 cut-off. The developed high-performance liquid chromatography assay with diode array detection (HPLC-DAD) cuts down the analysis time by 50% compared to most of the currently applied methods (retention times: dtx A = 8.3 min, dtx B = 8.9 min, dtx E= 7.5 min) and enables dtx detection down to sub-ppm range (limits of detection: dtx A = 0.19 mg/l, dtx B = 0.41 mg/l, dtx E = 0.10 mg/l). Stability of dtx E in filtrated culture broth was found to be much lower than anticipated (half-life time = 64.5 +/- 1.7 h). Thus, the detoxification of this metabolite is an abiotic process. Coupling of the HPLC-DAD system to an ion trap mass spectrometer with an electrospray ionization source operating in the positive mode allowed identification of most dtxs encountered by utilizing multiple stage MS-MS experiments and retention time rules.
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Affiliation(s)
- Christoph Seger
- Institute of Pharmacy, Leopold Franzens University Innsbruck, Innrain 52, A-6020 Innsbruck, Austria.
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Jia QI. Generating and Screening a Natural Product Library for CYclooxygenase and Lipoxygenase Dual Inhibitors. BIOACTIVE NATURAL PRODUCTS (PART J) 2003. [DOI: 10.1016/s1572-5995(03)80016-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Oku H, Ishiguro K. Cyclooxygenase-2 inhibitory 1,4-naphthoquinones from Impatiens balsamina L. Biol Pharm Bull 2002; 25:658-60. [PMID: 12033510 DOI: 10.1248/bpb.25.658] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Significant selective cyclooxygenase-2 (COX-2) inhibitory activities were observed for two new 1,4-naphthoquinone sodium salts, sodium 3-hydroxide-2[[sodium 3-hydroxide-1,4-dioxo(2-naphthyl)]ethyl]naphthalene-1,4-dione (impatienolate) (1) and sodium 2-hydroxide-3-(2-hydroxyethyl)naphthalene-1,4-dione (balsaminolate) (2), which were isolated from the corolla of Impatiens balsamina L. (Balsaminaceae). Their structures were elucidated by spectral techniques. Our results offer evidence supporting the use of I. balsamina L. to treat articular rheumatism, pain, and swelling.
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Affiliation(s)
- Hisae Oku
- Mukogawa Women's University School of Pharmaceutical Sciences, Nishinomiya, Japan
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47
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Johnson BM, Nikolic D, van Breemen RB. Applications of pulsed ultrafiltration-mass spectrometry. MASS SPECTROMETRY REVIEWS 2002; 21:76-86. [PMID: 12373745 DOI: 10.1002/mas.10020] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Pulsed ultrafiltration-mass spectrometry (PUF-MS) is a method with a variety of uses for the discovery and development of biologically active small molecules, including the screening of combinatorial libraries and natural product extracts for biologically active compounds, investigation of thermodynamic and kinetic ligand-receptor binding parameters, high-throughput metabolic screening, and the screening of combinatorial libraries and botanical extracts for electrophilic metabolites. Solution-phase ligand-screening assays that use pulsed ultrafiltration-mass spectrometry are useful for "reverse pharmacology" studies in which a macromolecular receptor of interest has been isolated, but ligands for the receptor are needed. Protein-binding studies that involve pulsed ultrafiltration can be used to rapidly determine classical binding parameters for interactions between a macromolecular receptor and a compound of interest. Metabolic screening assays can identify substrates for cytochromes p450, and should be capable of characterizing phase I metabolites with a throughput of at least 60 compounds/hr. Pulsed ultrafiltration can also be used in conjunction with LC-MS-MS to screen mixtures for compounds that might be activated metabolically to electrophilic quinoid and epoxide metabolites by cytochrome p450; that screening can provide early warning of compounds likely to be toxic when administered in large doses. The combination of pulsed-ultrafiltration extraction and mass spectrometric detection provides the sensitivity and selectivity necessary to characterize compounds present at low concentrations in complex chemical mixtures, and is applicable to the analysis of biologically active compounds from combinatorial libraries and botanical extracts.
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Affiliation(s)
- Benjamin M Johnson
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, 833 South Wood Street, Chicago, Illinois 60612-7231,USA
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48
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Pickens JC, Merritt EA, Ahn M, Verlinde CLMJ, Hol WGJ, Fan E. Anchor-based design of improved cholera toxin and E. coli heat-labile enterotoxin receptor binding antagonists that display multiple binding modes. CHEMISTRY & BIOLOGY 2002; 9:215-24. [PMID: 11880036 DOI: 10.1016/s1074-5521(02)00097-2] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The action of cholera toxin and E. coli heat-labile enterotoxin can be inhibited by blocking their binding to the cell-surface receptor GM1. We have used anchor-based design to create 15 receptor binding inhibitors that contain the previously characterized inhibitor MNPG as a substructure. In ELISA assays, all 15 compounds exhibited increased potency relative to MNPG. Binding affinities for two compounds, each containing a morpholine ring linked to MNPG via a hydrophobic tail, were characterized by pulsed ultrafiltration (PUF) and isothermal titration calorimetry (ITC). Crystal structures for these compounds bound to toxin B pentamer revealed a conserved binding mode for the MNPG moiety, with multiple binding modes adopted by the attached morpholine derivatives. The observed binding interactions can be exploited in the design of improved toxin binding inhibitors.
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Affiliation(s)
- Jason C Pickens
- Department of Biological Structure, Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195, USA
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49
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Wabnitz PA, Loo JA. Drug screening of pharmaceutical discovery compounds by micro-size exclusion chromatography/mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2002; 16:85-91. [PMID: 11754252 DOI: 10.1002/rcm.546] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Micro-size exclusion chromatography coupled with capillary liquid chromatography (capLC) and mass spectrometry (MS) provides a rapid and simple approach to the preliminary screening of active ligands toward a specific target macromolecule. In this study, the effectiveness of this technique is demonstrated by a number of small molecule ligands with known binding affinities towards the protein target. All ligands were incubated together with a target protein under native conditions. Separation was then achieved by microcentrifugation where the high molecular weight (MW) compounds were selectively passed through the size-exclusion material. The retained low MW compounds were then recovered and analyzed by capLC/MS. The absence of the ligand indicated strong affinity towards the target, while ligand detection indicated inactivity. This assay demonstrated the drugs that were acting as strong inhibitors of Co-PDF from those showing to be comparatively inactive. The relative binding rank order of the drugs towards Co-PDF was also determined. The results were validated by a corresponding set of control experiments in which the target molecules were excluded from the process. In principle, high-throughput micro-size exclusion chromatography, coupled with capLC/MS, offers a powerful technique as a preliminary screen in determining both the strong binding affinity and the relative affinity rank ordering of ligands towards a specific target macromolecule, and is complementary with other analytical drug screening techniques.
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Affiliation(s)
- Paul A Wabnitz
- Department of Pharmacokinetics, Dynamics and Metabolism. Pfizer Global Research & Development, Ann Arbor Laboratories, 2800 Plymouth Road, Ann Arbor, MI 48105, USA.
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50
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Shin YG, van Breemen RB. Analysis and screening of combinatorial libraries using mass spectrometry. Biopharm Drug Dispos 2001; 22:353-72. [PMID: 11835254 DOI: 10.1002/bdd.278] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Mass spectrometry is a highly selective and high throughput analytical technique that is ideally suited for the identification and purity determination of large numbers of compounds prepared using combinatorial chemistry or for the dereplication of natural products. Compounds may be characterized based on molecular weight, elemental composition and structural features based on fragmentation patterns. When coupled to a separation technique such as high-performance liquid chromatography (HPLC) or capillary electrophoresis, mass spectrometric applications may be expanded to include analysis of complex mixtures. However, the slower speed of the separation step reduces the throughput of the analysis. This review concerns the application of mass spectrometry to the characterization of combinatorial libraries and the screening of library and natural product mixtures. Strategies to enhance the throughput of LC-MS are discussed including fast HPLC and parallel LC-MS. Also, mass spectrometry-based screening methods are described including frontal affinity chromatography-mass spectrometry, gel permeation chromatography LC-MS, direct electrospray mass spectrometry of receptor-ligand complexes, affinity chromatography-mass spectrometry, and pulsed ultrafiltration mass spectrometry.
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Affiliation(s)
- Y G Shin
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, 833 S. Wood Street, Chicago, IL 60612, USA
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