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Silalai P, Jaipea S, Tocharus J, Athipornchai A, Suksamrarn A, Saeeng R. New 1,2,3-Triazole-genipin Analogues and Their Anti-Alzheimer's Activity. ACS OMEGA 2022; 7:24302-24316. [PMID: 35874205 PMCID: PMC9301951 DOI: 10.1021/acsomega.2c01593] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A novel series of 1,2,3-triazole-genipin analogues were designed, synthesized, and evaluated for neuroprotective activity, acetylcholinesterase (AChE), and butyrylcholinesterase (BuChE) inhibitory activity. The genipin analogues bearing bromoethyl- and diphenylhydroxy-triazole showed in vitro neuroprotective properties against H2O2 toxicity along with potent inhibitory activity on BuChE with IC50 values of 31.77 and 54.33 μM, respectively, compared with galantamine (IC50 = 34.05 μM). The molecular docking studies of these genipin analogues showed good binding energy and interact well with the key amino acids of BuChE via hydrogen-bonding and hydrophobic interactions. Triazole genipins might be promising lead compounds as anti-Alzheimer's agents.
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Affiliation(s)
- Patamawadee Silalai
- Department
of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Burapha University, Chonburi 20131, Thailand
| | - Suwichada Jaipea
- Department
of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Burapha University, Chonburi 20131, Thailand
| | - Jiraporn Tocharus
- Department
of Physiology, Faculty of Medicine, Chiang
Mai University, Chiang
Mai 50200, Thailand
| | - Anan Athipornchai
- Department
of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Burapha University, Chonburi 20131, Thailand
| | - Apichart Suksamrarn
- Department
of Chemistry and Center of Excellence for Innovation in Chemistry,
Faculty of Science, Ramkhamhaeng University, Bangkok 10240, Thailand
| | - Rungnapha Saeeng
- Department
of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Burapha University, Chonburi 20131, Thailand
- The
Research Unit in Synthetic Compounds and Synthetic Analogues from
Natural Product for Drug Discovery (RSND), Burapha University, Chonburi 20131, Thailand
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Adel RM, Lotfy RA, Darwish AS, Amer AS. Destructive effect of iron overload in brain tissue of albino rats: Ameliorative role of silver immobilized organo-modified casein nanocomposite as co-treating agent with Deferasirox. J Trace Elem Med Biol 2021; 67:126794. [PMID: 34052583 DOI: 10.1016/j.jtemb.2021.126794] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 05/03/2021] [Accepted: 05/17/2021] [Indexed: 01/19/2023]
Abstract
BACKGROUND Iron (Fe) is one of the most essential trace elements in the body that play crucial role in organisms' survival, however, excess deposition of it puts patients at higher risk of iron overload and tissue injury through production of reactive oxygen species (ROS), elevation of oxidative stress, development of endocrine disorders among which hypogonadism, and increased incidence of cells damage in vital organs. As deferasirox (DFX) is an approved Fe chelator drug, its inability to cross blood brain barrier (BBB) remains a definite obstacle against its use as Fe chelator in the brain. Lately, attention to nanoparticles usage in researches has been widely grown since their role in improving drug therapeutic effects and scavenging free radicals make them good candidates as chelating and antioxidant agents. AIMS Herein, after induction of iron overload, organo-modified casein immobilized silver nanocomposite (Ag@Tr-CA) was designed and explored as combined therapy with DFX drug to develop its penetrating efficiency toward BBB and its Fe chelating affinity. Moreover, to distinguish the advanced antioxidant character as well as the beneficial impact of it on lowering brain's oxidative stress. Meanwhile, its capability in regulating serum pituitary hormones such as follicle stimulating hormone (FSH), luteinizing hormone (LH), prolactin (PRL), and testosterone (T), ameliorating DNA damage, and improving brain's histopathological alterations was also assessed. METHODS The physicochemical characteristics of Ag@Tr-CA was carried out using X-ray powder diffractometry (XRD), Fourier transform infrared (FTIR), dynamic light scattering (DLS), field emission scanning electron microscope (FE-SEM), and high-resolution transmission electron microscope (HR-TEM) analyses. Effect of iron overload and subsequent treatment with DFX + Ag@Tr-CA on brain of adult male albino rats were evaluated using colorimetric methods to determine brain Fe concentration and brain oxidative stress biomarkers. Assessment of serum Fe indices and serum pituitary hormones (FSH, LH, PRL) and T were estimated by ELISA technique. Determination of DNA damage in cerebral cortex cells was accomplished using the alkaline version of comet assay, while detection of brain's histopathological alterations was performed by examination of H&E sections under light microscope. RESULTS The physicochemical characteristics of Ag@Tr-CA showing the proficiency of Ag nanoparticles (∼35 nm) in creating highly-ordered negatively charged micro-sized casein particles (∼450 μm). After induction of iron overload, DFX + Ag@Tr-CA combination efficiently down brain Fe concentration, brain oxidative stress markers, and DNA damage in cerebral cortex cells linked with improvements in brain histopathological alterations. Comparing DFX therapeutic action alone to its combination to whether Ag@Tr-CA or Tr-CA (organo-modified cross-linked casein nanoparticles) as co-treating agents revealed no significant effect on serum Fe indices, FSH, LH, PRL, and T against iron overload disease. CONCLUSION The present results showed that combination of Ag@Tr-CA nanocomposite with DFX makes it a promising co-treating agent against iron overload through improving the physiological, molecular, and histological structure of the brain in iron overloaded rats.
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Affiliation(s)
- Rana M Adel
- Zoology Department, Faculty of Women for Arts, Science and Education, Ain Shams University, 11757, Cairo, Egypt.
| | - Rania A Lotfy
- Zoology Department, Faculty of Women for Arts, Science and Education, Ain Shams University, 11757, Cairo, Egypt.
| | - Atef S Darwish
- Chemistry Department, Faculty of Science, Ain Shams University, 11566, Cairo, Egypt.
| | - Amany S Amer
- Zoology Department, Faculty of Women for Arts, Science and Education, Ain Shams University, 11757, Cairo, Egypt.
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Vilela AFL, Narciso Dos Reis VE, Cardoso CL. Co-Immobilized Capillary Enzyme Reactor Based on Beta-Secretase1 and Acetylcholinesterase: A Model for Dual-Ligand Screening. Front Chem 2021; 9:708374. [PMID: 34307303 PMCID: PMC8295500 DOI: 10.3389/fchem.2021.708374] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 06/23/2021] [Indexed: 11/13/2022] Open
Abstract
We have developed a dual enzymatic system assay involving liquid chromatography-mass spectrometry (LC–MS) to screen AChE and BACE1 ligands. A fused silica capillary (30 cm × 0.1 mm i.d. × 0.362 mm e.d.) was used as solid support. The co-immobilization procedure encompassed two steps and random immobilization. The resulting huAChE+BACE1-ICER/MS was characterized by using acetylcholine (ACh) and JMV2236 as substrates. The best conditions for the dual enzymatic system assay were evaluated and compared to the conditions of the individual enzymatic system assays. Analysis was performed in series for each enzyme. The kinetic parameters (KMapp) and inhibition assays were evaluated. To validate the system, galantamine and a β-secretase inhibitor were employed as standard inhibitors, which confirmed that the developed screening assay was able to identify reference ligands and to provide quantitative parameters. The combination of these two enzymes in a single on-line system allowed possible multi-target inhibitors to be screened and identified. The innovative huAChE+BACE1-ICER/MS dual enzymatic system reported herein proved to be a reliable tool to identify and to characterize hit ligands for AChE and BACE1 in an enzymatic competitive environment. This innovative system assay involved lower costs; measured the product from enzymatic hydrolysis directly by MS; enabled immediate recovery of the enzymatic activity; showed specificity, selectivity, and sensitivity; and mimicked the cellular process.
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Affiliation(s)
- Adriana Ferreira Lopes Vilela
- Departamento de Química, Grupo de Cromatografia de Bioafinidade e Produtos Naturais, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Vitor Eduardo Narciso Dos Reis
- Departamento de Química, Grupo de Cromatografia de Bioafinidade e Produtos Naturais, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Carmen Lúcia Cardoso
- Departamento de Química, Grupo de Cromatografia de Bioafinidade e Produtos Naturais, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
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LC-MS bioanalysis of targeted nasal galantamine bound chitosan nanoparticles in rats' brain homogenate and plasma. Anal Bioanal Chem 2021; 413:5181-5191. [PMID: 34173038 DOI: 10.1007/s00216-021-03487-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 06/03/2021] [Accepted: 06/16/2021] [Indexed: 10/21/2022]
Abstract
Validated LC-MS method for the direct quantitative analysis of galantamine (acetylcholinesterase inhibitor) was developed in rat cerebrospinal fluid and brain homogenate besides rat plasma, utilizing structurally close nalbuphine as an internal standard. After a simple protein precipitation step, samples are separated on 2-μm C18 column kept at 40 °C, using isocratic flow of 80% methanol in pH 9.5 ammonium formate buffer, and retention times were about 1.8 and 2.9 min for galantamine and nalbuphine, respectively. Mass detection with electrospray ionization (ESI) and positive polarity was able to detect 0.2 ng mL-1 galantamine using single ion monitoring mode (SIM) at m/z 288 for galantamine and m/z 358 for nalbuphine. The method showed linearity within the range of 0.5 - 300 ng mL-1. The proposed method was validated according to FDA guidelines. Trueness and precision showed acceptable values at all quality control levels, and recoveries were within 85.6 - 114.3% in all matrices at all runs and with relative standard deviations within 0.2 - 12.4%. The method was used to study in vivo brain uptake and pharmacokinetics of galantamine from brain homogenate and plasma samples following the administration of nasal galantamine-bound chitosan nanoparticles compared to oral and nasal galantamine solutions, in scopolamine-induced Alzheimer's disease rat model.
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Ahmad SS, Khalid M, Kamal MA, Younis K. Study of Nutraceuticals and Phytochemicals for the Management of Alzheimer's Disease: A Review. Curr Neuropharmacol 2021; 19:1884-1895. [PMID: 33588732 PMCID: PMC9185787 DOI: 10.2174/1570159x19666210215122333] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 01/06/2021] [Accepted: 02/12/2021] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Alzheimer's disease (AD) affects several people worldwide and has devastating impacts on society with a limited number of approaches for its pharmacological treatment. The main causes of AD are not clear yet. However, the formation of senile plaques, neurofibrillary tangles, hyper-phosphorylation of tau protein, and disruption of redox homeostasis may cause AD. These causes have a positive correlation with oxidative stress, producing reactive ions, which are responsible for altering the physiological condition of the body. CONCLUSION Ongoing research recommended the use of phytochemicals as acetylcholinesterase inhibitors to hinder the onset and progression of AD. The natural compound structures, including lignans, flavonoids, tannins, polyphenols, triterpenes, sterols, and alkaloids have anti-inflammatory, antioxidant, and anti-amyloidogenic properties. The purpose of this article is to provide a brief introduction to AD along with the use of natural compounds as new therapeutic approaches for its management.
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Affiliation(s)
| | | | - Mohammad A. Kamal
- Address correspondence to these authors at the Department of Bioengineering, Integral University Lucknow, UP-226026, India; E-mail: and King Fahd Medical Research Center, King Abdulaziz University, P. O. Box 80216, Jeddah 21589, Saudi Arabia; E-mail:
| | - Kaiser Younis
- Address correspondence to these authors at the Department of Bioengineering, Integral University Lucknow, UP-226026, India; E-mail: and King Fahd Medical Research Center, King Abdulaziz University, P. O. Box 80216, Jeddah 21589, Saudi Arabia; E-mail:
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Berkov S, Osorio E, Viladomat F, Bastida J. Chemodiversity, chemotaxonomy and chemoecology of Amaryllidaceae alkaloids. THE ALKALOIDS. CHEMISTRY AND BIOLOGY 2020; 83:113-185. [PMID: 32098649 DOI: 10.1016/bs.alkal.2019.10.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The Amaryllidaceae alkaloids are a distinctive chemotaxonomic feature of the subfamily Amaryllidoideae of the family Amaryllidaceae, which consists of 59 genera and >800 species distributed primarily in tropical and subtropical areas. Since the first isolation, ca. 140 ago, >600 structurally diverse Amaryllidaceae alkaloids have been reported from ca. 350 species (44% of all species in the subfamily). A few have been found in other plant families, but the majority are unique to the Amaryllidoideae. These alkaloids have attracted considerable research interest due to their wide range of biological and pharmacological activities, which have been extensively reviewed. In this chapter we provide a review of the 636 structures of isolated or tentatively identified alkaloids from plants of the Amaryllidoideae and their classification into 42 skeleton types, as well as a discussion on their distribution, and chemotaxonomical and chemoecological aspects.
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Affiliation(s)
- Strahil Berkov
- Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Edison Osorio
- Grupo de Investigación en Sustancias Bioactivas, Facultad de Ciencias Farmacéuticas y Alimentarias, Universidad de Antioquia, Medellín, Colombia
| | - Francesc Viladomat
- Grup de Productes Naturals, Departament de Biologia, Sanitat i Medi Ambient, Facultat de Farmàcia i Ciències de l'Alimentació, Universitat de Barcelona, Barcelona, Spain
| | - Jaume Bastida
- Grup de Productes Naturals, Departament de Biologia, Sanitat i Medi Ambient, Facultat de Farmàcia i Ciències de l'Alimentació, Universitat de Barcelona, Barcelona, Spain.
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Pharmacokinetics, bioavailability and tissue distribution study of JCC-02, a novel N-methyl-d-aspartate (NMDA) receptor inhibitor, in rats by LC-MS/MS. Eur J Pharm Sci 2019; 131:146-152. [PMID: 30776467 DOI: 10.1016/j.ejps.2019.02.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 01/16/2019] [Accepted: 02/14/2019] [Indexed: 01/27/2023]
Abstract
JCC-02, N-(3,5-dimethyladamantan-1-yl)-N'-(3-chlorophenyl) urea, has been developed as a novel N-methyl-d-aspartate (NMDA) receptor inhibitor for the treatment of Alzheimer's disease (AD). In this study, a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed to determine the concentration of JCC-02 in rat plasma and different tissues to investigate its pharmacokinetic behavior in vivo and distribution character in organs. The matrix samples were prepared by protein precipitation method with acetonitrile using gliclazide as the internal standard (IS). This validated method was successfully applied to JCC-02 pharmacokinetic study in rats after oral administration of low (0.7 mg·kg-1), medium (2 mg·kg-1) and high (6 mg·kg-1) concentration, intravenous administration (2 mg·kg-1) as well as tissue distribution in rats after administration of JCC-02 (2 mg·kg-1) orally. The results indicated that the area under the time curve (AUC0-∞) and peak plasma concentration (Cmax) were directly proportional to dosage and the pharmacokinetic behavior of JCC-02 in rats was a linear process with respect to dosage. JCC-02 could be absorbed into blood circulation rapidly because of its short time to reach peak plasma concentration (tmax). Meanwhile, JCC-02 has a low clearance and a high volume of distribution, which might result in its long half-time. Oral absolute bioavailability (F) of JCC-02 was (14.61 ± 5.81)%, which was turned out to be low relatively. In tissues, the differences of JCC-02 concentration were quite large. After administration, small intestine (22.29 ± 15.86 μg·mL-1), stomach (7.21 ± 2.87 μg·mL-1), large intestine (1.27 ± 0.57 μg·mL-1), liver (0.96 ± 0.52 μg·mL-1) and fat (0.48 ± 0.24 μg·mL-1) were the first five organs with the largest drug concentration. Small intestine could be the main part of drug absorption where most of the drug was distributed after oral administration. More importantly, JCC-02 could cross the blood-brain barrier (BBB), which may probably have a pretty good therapeutic effect on AD.
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Xu C, Ling L, Zhu J, Long J, Duan G, Yu Y. Ionic-Liquid-Based Infrared-Assisted Extraction (IL-IRAE) Coupled with HPLC–MS: a Green and Convenient Tool for Determination of TCMs. Chromatographia 2017. [DOI: 10.1007/s10337-016-3230-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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A novel one-step electrochemical preparation of silver nanoparticles/poly(3-methylthiophene) nanocomposite for detection of galantamine in human cerebrospinal fluid and narcissus. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2016.12.048] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Wahba SM, Darwish AS, Kamal SM. Ceria-containing uncoated and coated hydroxyapatite-based galantamine nanocomposites for formidable treatment of Alzheimer's disease in ovariectomized albino-rat model. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 65:151-63. [DOI: 10.1016/j.msec.2016.04.041] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 03/27/2016] [Accepted: 04/11/2016] [Indexed: 01/16/2023]
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Petruczynik A, Misiurek J, Tuzimski T, Uszyński R, Szymczak G, Chernetskyy M, Waksmundzka-Hajnos M. Comparison of different HPLC systems for analysis of galantamine and lycorine in various species of Amaryllidaceae family. J LIQ CHROMATOGR R T 2016. [DOI: 10.1080/10826076.2016.1204615] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- A. Petruczynik
- Department of Inorganic Chemistry, Medical University of Lublin, Lublin, Poland
| | - J. Misiurek
- Department of Inorganic Chemistry, Medical University of Lublin, Lublin, Poland
| | - T. Tuzimski
- Department of Physical Chemistry, Medical University of Lublin, Lublin, Poland
| | - R. Uszyński
- Department of Inorganic Chemistry, Medical University of Lublin, Lublin, Poland
| | - G. Szymczak
- Botanical Garden of Maria Curie-Skłodowska University in Lublin, Lublin, Poland
| | - M. Chernetskyy
- Botanical Garden of Maria Curie-Skłodowska University in Lublin, Lublin, Poland
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Sun C, Duan W, Wang X, Geng Y, Li J, Wang D. Combinative Application of pH-Zone-Refining Counter-Current Chromatography and Preparative HPLC for the Separation of Alkaloids From Lycoris radiata. J LIQ CHROMATOGR R T 2015. [DOI: 10.1080/10826076.2014.982868] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Changlei Sun
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Wenjuan Duan
- Shandong Analysis and Test Center, Shandong Academy of Sciences, Jinan, China
| | - Xiao Wang
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, China
- Shandong Analysis and Test Center, Shandong Academy of Sciences, Jinan, China
| | - Yanling Geng
- Shandong Analysis and Test Center, Shandong Academy of Sciences, Jinan, China
| | - Jia Li
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Daijie Wang
- Shandong Analysis and Test Center, Shandong Academy of Sciences, Jinan, China
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Thomas S, Paul SK, Agarwal A, Mathela CS. Semi-preparative isolation and characterization of a principal oxidative degradation product in galantamine hydrobromide by LC-ESI-MSnand 2D-NMR. ACTA CHROMATOGR 2014. [DOI: 10.1556/achrom.26.2014.3.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Wu C, Xu X, Feng C, Shi Y, Liu W, Zhu X, Zhang J. Degradation kinetics study of cabozantinib by a novel stability-indicating LC method and identification of its major degradation products by LC/TOF-MS and LC–MS/MS. J Pharm Biomed Anal 2014; 98:356-63. [DOI: 10.1016/j.jpba.2014.06.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Revised: 06/03/2014] [Accepted: 06/05/2014] [Indexed: 11/29/2022]
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Comparison of (bio-)transformation methods for the generation of metabolite-like compound libraries of p38α MAP kinase inhibitors using high-resolution screening. J Pharm Biomed Anal 2014; 88:235-44. [DOI: 10.1016/j.jpba.2013.08.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 08/26/2013] [Accepted: 08/27/2013] [Indexed: 11/17/2022]
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Abstract
Covering: July 2010 to June 2012. Previous review: Nat. Prod. Rep., 2011, 28, 1126-1142. Recent progress on the isolation, identification, biological activity and synthetic studies of structurally diverse alkaloids from plants of the family Amaryllidaceae is summarized in this review. In addition, the structurally related alkaloids isolated from Sceletium species are discussed as well.
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Affiliation(s)
- Zhong Jin
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China.
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Physostigmine and galanthamine bind in the presence of agonist at the canonical and noncanonical subunit interfaces of a nicotinic acetylcholine receptor. J Neurosci 2013; 33:485-94. [PMID: 23303929 DOI: 10.1523/jneurosci.3483-12.2013] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Galanthamine and physostigmine are clinically used cholinomimetics that both inhibit acetylcholinesterase and also interact directly with and potentiate nAChRs. As with most nAChR-positive allosteric modulators, the location and number of their binding site(s) within nAChRs are unknown. In this study, we use the intrinsic photoreactivities of [(3)H]physostigmine and [(3)H]galanthamine upon irradiation at 312 nm to directly identify amino acids contributing to their binding sites in the Torpedo californica nAChR. Protein sequencing of fragments isolated from proteolytic digests of [(3)H]physostigmine- or [(3)H]galanthamine-photolabeled nAChR establish that, in the presence of agonist (carbamylcholine), both drugs photolabeled amino acids on the complementary (non-α) surface of the transmitter binding sites (γTyr-111/γTyr-117/δTyr172). They also photolabeled δTyr-212 at the δ-β subunit interface and γTyr-105 in the vestibule of the ion channel, with photolabeling of both residues enhanced in the presence of agonist. Furthermore, [(3)H]physostigmine photolabeling of γTyr-111, γTyr-117, δTyr-212, and γTyr-105 was inhibited in the presence of nonradioactive galanthamine. The locations of the photolabeled amino acids in the nAChR structure and the results of computational docking studies provide evidence that, in the presence of agonist, physostigmine and galanthamine bind to at least three distinct sites in the nAChR extracellular domain: at the α-γ interface (1) in the entry to the transmitter binding site and (2) in the vestibule of the ion channel near the level of the transmitter binding site, and at the δ-β interface (3) in a location equivalent to the benzodiazepine binding site in GABA(A) receptors.
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Zhang Y, Chen Z. Nonaqueous CE ESI-IT-MS analysis of Amaryllidaceae alkaloids. J Sep Sci 2013; 36:1078-84. [PMID: 23436771 DOI: 10.1002/jssc.201201083] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2012] [Revised: 12/13/2012] [Accepted: 12/15/2012] [Indexed: 01/14/2023]
Abstract
The Amaryllidaceae are widely distributed medical plants. Lycorine, lycoramine, lycoremine, and lycobetaine are the major active alkaloids in Amaryllidaceae plants. A nonaqueous CE ESI-IT-MS method for separation, identification, and quantification of the Amaryllidaceae alkaloids has been developed. The MS(1-3) behavior has been studied and the fragmentation pathways of main fragment ions have been proposed. The effects of several factors such as composition and concentration of buffer, applied voltage, composition, and flow rate of the sheath liquid, nebulizing gas pressure, flow rate, and temperature of drying gas were investigated. Under the optimal conditions, the linear concentration range of these compounds was wide with the correlation coefficient (R(2) ) >0.99. RSDs of migration time and peak areas were <10%. The LODs were <240 ng/mL. The proposed method can be successfully applied to the determination of the related alkaloids in the Lycoris radiata roots.
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Affiliation(s)
- Yulin Zhang
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, P R China
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Jahn S, Seiwert B, Kretzing S, Abraham G, Regenthal R, Karst U. Metabolic studies of the Amaryllidaceous alkaloids galantamine and lycorine based on electrochemical simulation in addition to in vivo and in vitro models. Anal Chim Acta 2012. [DOI: 10.1016/j.aca.2012.10.042] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Eichhorn P, Pérez S, Aceña J, Gardinali P, Abad JL, Barceló D. Identification of phototransformation products of sildenafil (Viagra) and its N-demethylated human metabolite under simulated sunlight. JOURNAL OF MASS SPECTROMETRY : JMS 2012; 47:701-711. [PMID: 22707162 DOI: 10.1002/jms.2998] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Recent publications on pharmaceutical monitoring are increasingly covering the field of illicit drugs and lately the forensic evaluation of designing illegal analogs of lifestyle drugs like the phosphodiesterase type 5 (PDE-5) inhibitors Viagra (sildenafil), Levitra (vardenafil) and Cialis (tadalafil). Recently, the presence of all three erectile dysfunction treatment drugs has been reported in wastewaters at very low concentrations. In the environment, contaminants undergo various physical or chemical processes classified into abiotic (photolysis, hydrolysis) and biotic (biodegradation) reactions. Thus, changes in the chemical structure lead to the formation of new transformation products, which may persist in the environment or be further degraded. This study describes the photolysis of sildenafil (SDF) and its human metabolite N-demethylsildenafil (DM-SDF) under simulated solar radiation (Xenon lamp). Following chromatographic separation of the irradiated samples, eight photoproducts in the SDF samples and six photoproducts for DM-SDF were detected and characterized. The combination of ultra performance liquid chromatography-electrospray ionization-quadrupole time-of-flight-mass spectrometry (UPLC-ESI-QToF-MS), liquid chromatography-atmospheric pressure chemical ionization-triple quadrupole mass spectrometry (LC-APCI-QqQ-MS) and hydrogen/deuterium-exchange experiments allowed to propose plausible chemical structures for the photoproducts, taking into account the characteristic fragmentation patterns and the accurate mass measurements. These mass spectral data provided sound evidence for the susceptibility of the piperazine ring toward photodegradation. A gradual breakdown of this heterocyclic structure gave rise to a series of products, which in part were identical for SDF and DM-SDF. The sulfonic acid, as the formal product of sulfonamide hydrolysis, was identified as key intermediate in the photolysis pathway. In both drug/metabolite molecules, phototransformation processes taking place beyond the sulfonamide group were deemed to be of minor relevance.
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Affiliation(s)
- Peter Eichhorn
- IDAEA-CSIC, Department of Environmental Chemistry, Barcelona, 08034, Spain
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