1
|
Mahmoodi N, Minnow YVT, Harijan RK, Bedard GT, Schramm VL. Cell-Effective Transition-State Analogue of Phenylethanolamine N-Methyltransferase. Biochemistry 2023; 62:2257-2268. [PMID: 37467463 PMCID: PMC10646973 DOI: 10.1021/acs.biochem.3c00103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/21/2023]
Abstract
Phenylethanolamine N-methyltransferase (PNMT) catalyzes the S-adenosyl-l-methionine (SAM)-dependent methylation of norepinephrine to form epinephrine. Epinephrine is implicated in the regulation of blood pressure, respiration, Alzheimer's disease, and post-traumatic stress disorder (PTSD). Transition-state (TS) analogues bind their target enzymes orders of magnitude more tightly than their substrates. A synthetic strategy for first-generation TS analogues of human PNMT (hPNMT) permitted structural analysis of hPNMT and revealed potential for second-generation inhibitors [Mahmoodi, N.; J. Am. Chem. Soc. 2020, 142, 14222-14233]. A second-generation TS analogue inhibitor of PNMT was designed, synthesized, and characterized to yield a Ki value of 1.2 nM. PNMT isothermal titration calorimetry (ITC) measurements of inhibitor 4 indicated a negative cooperative binding mechanism driven by large favorable entropic contributions and smaller enthalpic contributions. Cell-based assays with HEK293T cells expressing PNMT revealed a cell permeable, intracellular PNMT inhibitor with an IC50 value of 81 nM. Structural analysis demonstrated inhibitor 4 filling catalytic site regions to recapitulate both norepinephrine and SAM interactions. Conformation of the second-generation inhibitor in the catalytic site of PNMT improves contacts relative to those from the first-generation inhibitors. Inhibitor 4 demonstrates up to 51,000-fold specificity for PNMT relative to DNA and protein methyltransferases. Inhibitor 4 also exhibits a 12,000-fold specificity for PNMT over the α2-adrenoceptor.
Collapse
Affiliation(s)
- Niusha Mahmoodi
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461, United States
| | - Yacoba V T Minnow
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461, United States
| | - Rajesh K Harijan
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461, United States
| | - Gabriel T Bedard
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461, United States
| | - Vern L Schramm
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461, United States
| |
Collapse
|
2
|
Viana RR, Pego AMF, Oliveira TFD, Dallegrave E, Eller S. Liquid chromatography-tandem mass spectrometry method for simultaneous quantification of neurotransmitters in rat brain tissue exposed to 4'-Fluoro-α-PHP. Biomed Chromatogr 2022; 36:e5487. [PMID: 36001303 DOI: 10.1002/bmc.5487] [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: 04/26/2022] [Revised: 07/26/2022] [Accepted: 08/22/2022] [Indexed: 11/11/2022]
Abstract
The combination of different advanced analytical techniques makes it possible to determine the concentrations of neurotransmitters in various biological matrices, providing a complex and comprehensive study of the effects of psychoactive substances. The present study aimed to develop and validate a fast and simple analytical method for the determination of acetylcholine, serotonin, γ-aminobutyric acid, glutamate, dopamine, and metabolites in rats brain tissue by liquid chromatography coupled to tandem mass spectrometry. The brain was homogenized and an aliquot of sample, dopamine-d4 , and acetone were added in a tube and then vortexed and centrifuged. The supernatant was collected and dried. The residue was reconstituted and injected. LLOQ ranged from 0.001 to 1 μg/g; intra-run precision from 0.47 to 11.52%; inter-run precision from 0.68 to 17.54%; bias from 89.10 to 109.60%. As proof of concept, the method was applied to animals exposed to the synthetic cathinone 4'-fuoro-α-pyrrolidinohexanophenone (300 mg/kg). In addition, the workflow proved to be simple, rapid, and useful to estimate the concentration of neurotransmitters. This analytical tool can be used to support the investigation of the changes in the neurochemical profile for the characterization of the mechanism of action of psychoactive substances, as well as both neurologic and psychiatric diseases.
Collapse
Affiliation(s)
- Roberta Rodrigues Viana
- Undergraduate Program in Pharmacy, Federal University of Health Sciences of Porto Alegre, Porto Alegre, RS, Brazil
| | | | - Tiago Franco de Oliveira
- Pharmacosciences Department, Federal University of Health Sciences of Porto Alegre, Porto Alegre, RS, Brazil.,Graduate Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, RS, Brazil
| | - Eliane Dallegrave
- Pharmacosciences Department, Federal University of Health Sciences of Porto Alegre, Porto Alegre, RS, Brazil.,Graduate Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, RS, Brazil.,Graduate Program in Pathology, Federal University of Health Sciences of Porto Alegre, RS, Brazil
| | - Sarah Eller
- Pharmacosciences Department, Federal University of Health Sciences of Porto Alegre, Porto Alegre, RS, Brazil.,Graduate Program in Pathology, Federal University of Health Sciences of Porto Alegre, RS, Brazil
| |
Collapse
|
3
|
Lyhne MK, Vegge A, Povlsen GK, Slaaby R, Kildegaard J, Pedersen-Bjergaard U, Olsen LH. Hyperinsulinaemic hypoglycaemia in non-anaesthetized Göttingen minipigs induces a counter-regulatory endocrine response and electrocardiographic changes. Sci Rep 2021; 11:5983. [PMID: 33727615 PMCID: PMC7966749 DOI: 10.1038/s41598-021-84758-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 02/12/2021] [Indexed: 12/18/2022] Open
Abstract
The potentially fatal cardiovascular effects of hypoglycaemia are not well understood and large animal models of the counter-regulatory responses and cardiovascular consequences of insulin-induced hypoglycaemia are needed to understand the mechanisms in humans. The aim of this study was to develop a human-like minipig model of hypoglycaemia including healthy and diabetic pigs to investigate endocrine, electrocardiographic and platelet effects. Hypoglycaemia was induced using a hyperinsulinaemic, hypoglycaemic clamp and an insulin bolus protocol. Plasma glucose, glucagon, C-peptide, insulin, epinephrine and platelet aggregation responses were measured before, during and after hypoglycaemia. Continuous electrocardiographic recordings were obtained. Hypoglycaemia at a plasma glucose concentration of 0.8–1.0 mM in the clamp induced 25-fold increase in epinephrine and sixfold and threefold increase in glucagon for healthy and diabetic pigs, respectively. The hypoglycaemic clamp induced QTc-interval prolongation and increase in cardiac arrhythmias. In the bolus approach, the non-diabetic group reached plasma glucose target of 1.5 mM and QTc-interval was prolonged after insulin injection, but before glucose nadir. The diabetic group did not reach hypoglycaemic target, but still demonstrated QTc-interval prolongation. These results demonstrate effects of hyperinsulinaemic hypoglycaemia closely resembling human physiology, indicating the minipig as a translational animal model of counter-regulatory endocrine and myocardial effects of hypoglycaemia.
Collapse
Affiliation(s)
- Mille K Lyhne
- Department of Veterinary and Animal Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Andreas Vegge
- Global Drug Discovery, Novo Nordisk A/S, Måløv, Denmark
| | | | - Rita Slaaby
- Global Drug Discovery, Novo Nordisk A/S, Måløv, Denmark
| | | | | | - Lisbeth H Olsen
- Department of Veterinary and Animal Sciences, University of Copenhagen, Copenhagen, Denmark.
| |
Collapse
|
4
|
Sasaki N, Ikenaka Y, Inoue Y, Ichise T, Nagata N, Ishizuka M, Nakayama SM, Nakamura K, Takiguchi M. Urinary free metanephrines measurement in dogs with adrenal gland diseases using a new simple liquid chromatography tandem mass spectrometry method. J Vet Med Sci 2021; 83:648-655. [PMID: 33678734 PMCID: PMC8111342 DOI: 10.1292/jvms.20-0508] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Measurement of urinary metanephrines in spot samples is used for the diagnosis of canine
pheochromocytoma (PC). We describe a simple analytical method based on liquid
chromatography tandem mass spectrometry (LC-MS/MS) for measuring free metanephrine (MN)
and normetanephrine (NMN) in spot urine samples. Using the developed method, we evaluated
the stability of urinary free-MN and free-NMN at various storing conditions. In addition,
we assessed the feasibility of urinary free-MN and -NMN measurement for diagnosing PC.
Urine samples were mixed with stable isotope internal standards and thereafter purified by
ultrafiltration. The purified samples were analyzed by LC-MS/MS in the multiple reaction
monitoring mode after separation on a multimode octa decyl silyl column. The coefficient
of variation of free-MN and -NMN measurement was 7.6% and 5.5%, respectively. The
linearity range was 0.5–10 µg/l for both analytes. Degradation was less than 10% for both
analytes under any of the storage conditions. The median free-NMN ratio to creatinine of 9
PC dogs (595, range 144–47,961) was significantly higher (P<0.05) than
that of 13 dogs with hypercortisolism (125, range 52–224) or 15 healthy dogs (85, range
50–117). The developed method is simple and may not require acidification of spot urine.
The results of this preliminary retrospective study suggest that the measurement of
urinary free metanephrines is a promising tool for diagnosing canine PC.
Collapse
Affiliation(s)
- Noboru Sasaki
- Laboratory of Veterinary Internal Medicine, Department of Clinical Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo, Hokkaido 060-0818, Japan
| | - Yoshinori Ikenaka
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo, Hokkaido 060-0818, Japan.,Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom 2520, North West, South Africa.,Present address: Translational Research Unit, Veterinary Teaching Hospotal, Faculty of Veterinary Medicine, Hokkaido University, Kita 18, Nishi 9, Kita-ku, Sapporo, Hokkaido 060-0818, Japan
| | - Yumiko Inoue
- Laboratory of Veterinary Internal Medicine, Department of Clinical Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo, Hokkaido 060-0818, Japan
| | - Takahiro Ichise
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo, Hokkaido 060-0818, Japan
| | - Noriyuki Nagata
- Laboratory of Veterinary Internal Medicine, Department of Clinical Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo, Hokkaido 060-0818, Japan
| | - Mayumi Ishizuka
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo, Hokkaido 060-0818, Japan
| | - Syouta Mm Nakayama
- Laboratory of Toxicology, Department of Environmental Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo, Hokkaido 060-0818, Japan
| | - Kensuke Nakamura
- Laboratory of Veterinary Internal Medicine, Department of Clinical Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo, Hokkaido 060-0818, Japan
| | - Mitsuyoshi Takiguchi
- Laboratory of Veterinary Internal Medicine, Department of Clinical Sciences, Faculty of Veterinary Medicine, Hokkaido University, Kita 18-jo Nishi 9-chome, Kita-ku, Sapporo, Hokkaido 060-0818, Japan
| |
Collapse
|
5
|
Podjava A, Šilaks A. Synthesis and sorptive properties of molecularly imprinted polymer for simultaneous isolation of catecholamines and their metabolites from biological fluids. J LIQ CHROMATOGR R T 2021. [DOI: 10.1080/10826076.2021.1874980] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Anton Podjava
- Laboratory of Chromatography and Mass Spectrometry, Department of Chemistry, Academic Center of Natural Sciences, University of Latvia, Riga, Latvia
| | - Artūrs Šilaks
- Laboratory of Chromatography and Mass Spectrometry, Department of Chemistry, Academic Center of Natural Sciences, University of Latvia, Riga, Latvia
| |
Collapse
|
6
|
Britto-Júnior J, Antunes NJ, Campos R, Sucupira M, Mendes GD, Fernandes F, Moraes MO, Moraes MEA, De Nucci G. Determination of dopamine, noradrenaline, and adrenaline in Krebs-Henseleit solution by liquid chromatography coupled with tandem mass spectrometry and measurement of their basal release from Chelonoidis carbonaria aortae in vitro. Biomed Chromatogr 2020; 35:e4978. [PMID: 32866321 DOI: 10.1002/bmc.4978] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 08/14/2020] [Accepted: 08/27/2020] [Indexed: 01/07/2023]
Abstract
This study presented for the first time the development and validation of a sensitive method for quantification of dopamine, noradrenaline, and adrenaline in Krebs-Henseleit solution by LC-tandem mass spectrometry. Aliquots of 2.0 mL calibrators, quality controls, and samples of Krebs-Henseleit solution incubated with tortoise's aortic ring for 30 min were extracted by solid-phase extraction. Catecholamine separation was achieved on a 100 × 4.6 mm LiChrospher RP-8 column and the quantification was performed by a mass spectrometer equipped with an electrospray interface operating in positive ion mode. The run time was 4 min and the calibration curve was linear over the range of 0.1-20.0 ng/mL. The method was applied to the measurement of basal release of dopamine, noradrenaline, and adrenaline from the tortoise Chelonoidis carbonaria aortae in vitro. One aortic ring (30 mm) per tortoise (n = 5) was incubated for 30 min in a 5 mL organ bath filled with Krebs-Henseleit solution. The method demonstrated sensitivity, precision, and accuracy enough for its application in the measurement of basal release of these catecholamines from C. carbonaria aortic rings in vitro. The mean (standard deviation) concentrations of dopamine, noradrenaline, and adrenaline were 3.48 (2.55) ng/mL, 1.40 (0.57) ng/mL, and 1.87 (1.09) ng/mL, respectively.
Collapse
Affiliation(s)
- José Britto-Júnior
- Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Natalícia J Antunes
- Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Rafael Campos
- Superior Institute of Biomedical Sciences, Ceará State University (UECE), Fortaleza, CE, Brazil.,Clinical Pharmacology Unit, Drug Research and Development Center, Federal University of Ceará (UFC), Fortaleza, CE, Brazil
| | - Mauro Sucupira
- Clinical Pharmacology Unit, Drug Research and Development Center, Federal University of Ceará (UFC), Fortaleza, CE, Brazil
| | - Gustavo Duarte Mendes
- Department of Pharmacology, Faculty of Medicine, São Leopoldo Mandic, Campinas, SP, Brazil.,Department of Pharmacology, Faculty of Medicine, Metropolitan University of Santos, Santos, SP, Brazil
| | - Fernanda Fernandes
- Department of Pharmacology, Faculty of Medicine, São Leopoldo Mandic, Campinas, SP, Brazil
| | - Manoel Odorico Moraes
- Clinical Pharmacology Unit, Drug Research and Development Center, Federal University of Ceará (UFC), Fortaleza, CE, Brazil
| | - Maria Elisabete A Moraes
- Clinical Pharmacology Unit, Drug Research and Development Center, Federal University of Ceará (UFC), Fortaleza, CE, Brazil
| | - Gilberto De Nucci
- Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Campinas, SP, Brazil.,Clinical Pharmacology Unit, Drug Research and Development Center, Federal University of Ceará (UFC), Fortaleza, CE, Brazil.,Department of Pharmacology, Faculty of Medicine, São Leopoldo Mandic, Campinas, SP, Brazil.,Institute of Biomedical Sciences, University of São Paulo (USP), São Paulo, Brazil
| |
Collapse
|
7
|
Lin K, Cabral P, Ekpenyong O, Bader SE, Galvao J, Kim Y, Lu SX, Tam YT, Bruder M, Rearden P, Shankaran H, Beaumont M. A Surrogate Matrix-Based Approach Toward Multiplexed Quantitation of an sGC Stimulator and cGMP in Ocular Tissue and Plasma. Toxicol Pathol 2020; 49:544-554. [PMID: 32851936 DOI: 10.1177/0192623320948836] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A liquid chromatography-tandem mass spectrometry assay was developed and qualified for the multiplexed quantitation of a small molecule stimulator of soluble guanylate cyclase (sGC) and its target engagement biomarker, 3',5'-cyclic guanosine monophosphate (cGMP), in ocular tissues and plasma from a single surrogate matrix calibration curve. A surrogate matrix approach was used in this assay due to the limited quantities of blank ocular matrices in a discovery research setting. After optimization, the assay showed high accuracy, precision, and recovery as well as parallelism between the surrogate matrix and the biological matrices (rabbit plasma, vitreous, and retina-choroid). This assay provided pharmacokinetic and target engagement data after intravitreal administration of the sGC stimulator. The nitric oxide-sGC-cGMP pathway is a potential target to address glaucoma. Increasing sGC-mediated production of cGMP could improve aqueous humor outflow and ocular blood flow. The sGC stimulator showed dose-dependent exposure in rabbit vitreous, retina-choroid, and plasma. The cGMP exhibited a delayed yet sustained increase in vitreous humor but not retina-choroid. Multiplexed measurement of both pharmacokinetic and target engagement analytes reduced animal usage and provided improved context for interpreting PK and PD relationships.
Collapse
Affiliation(s)
- Kenneth Lin
- 2793Merck & Co., Inc, South San Francisco, CA, USA
| | - Pablo Cabral
- 2793Merck & Co., Inc, South San Francisco, CA, USA
| | | | | | - Joana Galvao
- 2793Merck & Co., Inc, South San Francisco, CA, USA
| | | | - Sherry X Lu
- 2793Merck & Co., Inc, South San Francisco, CA, USA
| | - Yu Tong Tam
- 2793Merck & Co., Inc, South San Francisco, CA, USA
| | - Marc Bruder
- 2793Merck & Co., Inc, South San Francisco, CA, USA
| | - Paul Rearden
- 2793Merck & Co., Inc, South San Francisco, CA, USA
| | | | | |
Collapse
|
8
|
Ma L, Zhao T, Zhang P, Liu M, Shi H, Kang W. Determination of monoamine neurotransmitters and metabolites by high-performance liquid chromatography based on Ag(III) complex chemiluminescence detection. Anal Biochem 2020; 593:113594. [DOI: 10.1016/j.ab.2020.113594] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Revised: 01/20/2020] [Accepted: 01/20/2020] [Indexed: 02/08/2023]
|
9
|
Castillo-Aguirre A, Maldonado M. Preparation of Methacrylate-based Polymers Modified with Chiral Resorcinarenes and Their Evaluation as Sorbents in Norepinephrine Microextraction. Polymers (Basel) 2019; 11:E1428. [PMID: 31480387 PMCID: PMC6780700 DOI: 10.3390/polym11091428] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2019] [Revised: 08/19/2019] [Accepted: 08/26/2019] [Indexed: 11/17/2022] Open
Abstract
Aminomethylation reactions between chiral amino compounds (S)-(-)-1-phenylethylamine and l-proline with tetranonylresorcinarene and tetra-(4-hydroxyphenyl)resorcinarene in presence of formaldehyde were studied. The reaction between l-proline and resorcinarenes generated regioselectively chiral tetra-Mannich bases, due to the molecular incorporation of the fragment of the chiral amino acid. On the other hand, tetranonylresorcinarene and (S)-(-)-1-phenylethylamine formed regio- and diasteroselectively chiral tetrabenzoxazines, both by chiral auxiliary functionalization and by the transformation of the molecular structure that confers inherent chirality. The products obtained were characterized using IR, 1H-NMR, 13C-NMR, COSY, HMQC, and HMBC techniques. The reaction of (S)-(-)-1-phenylethylamine with tetra-(4-hydroxyphenyl)resorcinarene did not proceed under the experimental conditions. Once the chiral aminomethylated tetra-(4-hydroxyphenyl)resorcinarene was obtained, the chemical modification of poly(GMA-co-EDMA) was studied, and the results showed an efficient incorporation of the aminomethylated compound. For the physical modification, chiral aminomethylated tetranonylresorcinarenes were employed, finding that the incorporation of modified resorcinarenes occurs, but with less efficiency than that observed using chemical modification. The modified polymers were characterized via FT-IR, scanning electron microscopy imaging, and elemental analysis. Finally, polymers modified with chiral resorcinarenes were used as sorbents in norepinephrine microextraction; for practical purposes, artificial urine was prepared and used. To perform the microextraction, the decision was made to use the modern rotating-disk sorptive extraction technique (RDSE), because of its analytical attributes as a green, or eco-friendly, technique. According to the results, the method preliminarily validated for the determination of norepinephrine in artificial urine shows that the modified polymer with chiral derivative of tetra-(4-hydroxyphenyl)resorcinarene worked effectively as a new sorbent phase for the quantitative microextraction of norepinephrine, exhibiting high stability and homogeneity of composition and structure within the working range.
Collapse
Affiliation(s)
- Alver Castillo-Aguirre
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Bogotá, 30 No. 45, Carrera 03, Colombia
| | - Mauricio Maldonado
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Bogotá, 30 No. 45, Carrera 03, Colombia.
| |
Collapse
|
10
|
Xie L, Chen L, Gu P, Wei L, Kang X. A Convenient Method for Extraction and Analysis with High-Pressure Liquid Chromatography of Catecholamine Neurotransmitters and Their Metabolites. J Vis Exp 2018. [PMID: 29553566 DOI: 10.3791/56445] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
The extraction and analysis of catecholamine neurotransmitters in biological fluids is of great importance in assessing nervous system function and related diseases, but their precise measurement is still a challenge. Many protocols have been described for neurotransmitter measurement by a variety of instruments, including high-pressure liquid chromatography (HPLC). However, there are shortcomings, such as complicated operation or hard-to-detect multiple targets, which cannot be avoided, and presently, the dominant analysis technique is still HPLC coupled with sensitive electrochemical or fluorimetric detection, due to its high sensitivity and good selectivity. Here, a detailed protocol is described for the pretreatment and detection of catecholamines with high pressure liquid chromatography with electrochemical detection (HPLC-ECD) in real urine samples of infants, using electrospun composite nanofibers composed of polymeric crown ether with polystyrene as adsorbent, also known as the packed-fiber solid phase extraction (PFSPE) method. We show how urine samples can be easily precleaned by a nanofiber-packed solid phase column, and how the analytes in the sample can be rapidly enriched, desorbed, and detected on an ECD system. PFSPE greatly simplifies the pretreatment procedures for biological samples, allowing for decreased time, expense, and reduction of the loss of targets. Overall, this work illustrates a simple and convenient protocol for solid-phase extraction coupled to an HPLC-ECD system for simultaneous determination of three monoamine neurotransmitters (norepinephrine (NE), epinephrine (E), dopamine (DA)) and two of their metabolites (3-methoxy-4-hydroxyphenylglycol (MHPG) and 3,4-dihydroxy-phenylacetic acid (DOPAC)) in infants' urine. The established protocol was applied to assess the differences of urinary catecholamines and their metabolites between high-risk infants with perinatal brain damage and healthy controls. Comparative analysis revealed a significant difference in urinary MHPG between the two groups, indicating that the catecholamine metabolites may be an important candidate marker for early diagnosis of cases at risk for brain damage in infants.
Collapse
Affiliation(s)
- Li Xie
- School of Public Health of Southeast University, Laboratory of Environment and Biosafety Research Institute of Southeast University in Suzhou;
| | - Liqin Chen
- School of Public Health, Tianjin Medical University
| | - Pan Gu
- British Columbia Academy, Nanjing Foreign Language School
| | - Lanlan Wei
- School of Public Health of Southeast University, Laboratory of Environment and Biosafety Research Institute of Southeast University in Suzhou
| | - Xuejun Kang
- Key Laboratory of Child Development and Learning Science (Ministry of Education), School of Biological Science & Medical Engineering, Southeast University
| |
Collapse
|
11
|
Bergh MSS, Bogen IL, Andersen JM, Øiestad ÅML, Berg T. Determination of adrenaline, noradrenaline and corticosterone in rodent blood by ion pair reversed phase UHPLC–MS/MS. J Chromatogr B Analyt Technol Biomed Life Sci 2018; 1072:161-172. [DOI: 10.1016/j.jchromb.2017.11.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 08/28/2017] [Accepted: 11/11/2017] [Indexed: 01/05/2023]
|
12
|
Zhou J, Yin H, Ma H, Wei S, Wen E, Zhang W, Dang H. Efficient and selective analytical method for the quantification of aβ-adrenoceptor agonist, isoproterenol, by LC–MS/MS and its application to pharmacokinetics studies. J LIQ CHROMATOGR R T 2017. [DOI: 10.1080/10826076.2017.1348952] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Jiawei Zhou
- School of Pharmacy, Ningxia Medical University, Yinchuan, China
| | - Hui Yin
- School of Pharmacy, Ningxia Medical University, Yinchuan, China
| | - Hui Ma
- School of Pharmacy, Ningxia Medical University, Yinchuan, China
| | - Shijie Wei
- Department of Pharmacy, Institute of Clinical Pharmacology, General Hospital of Ningxia Medical University, Yinchuan, China
| | - Enhui Wen
- School of Pharmacy, Ningxia Medical University, Yinchuan, China
| | - Wenping Zhang
- Department of Pharmacy, Institute of Clinical Pharmacology, General Hospital of Ningxia Medical University, Yinchuan, China
| | - Hongwan Dang
- Department of Pharmacy, Institute of Clinical Pharmacology, General Hospital of Ningxia Medical University, Yinchuan, China
| |
Collapse
|
13
|
Sun Y, Li Y, Xu J, Huang L, Qiu T, Zhong S. Interconnectivity of macroporous molecularly imprinted polymers fabricated by hydroxyapatite-stabilized Pickering high internal phase emulsions-hydrogels for the selective recognition of protein. Colloids Surf B Biointerfaces 2017; 155:142-149. [DOI: 10.1016/j.colsurfb.2017.04.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 03/25/2017] [Accepted: 04/04/2017] [Indexed: 12/25/2022]
|
14
|
Development of bioanalytical assays for variegin, a peptide-based bivalent direct thrombin inhibitor. Bioanalysis 2017; 9:693-705. [PMID: 28488882 DOI: 10.4155/bio-2017-0006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
AIM Variegin is an anticoagulant peptide that will be tested in porcine models of percutaneous coronary intervention. We developed three bioanalytical assays for variegin quantitation and utilized these methods to evaluate pharmacokinetics of variegin in pigs. Results & methodology: The LC-MS/MS, thrombin amidolytic and modified thrombin time assays had a quantitation range of 21.6-5541.7, 10.8-5541.7 and 5.4-5541.7 nM in human plasma, respectively. The elimination half-lives obtained using the LC-MS/MS, modified thrombin time and thrombin amidolytic assays were 52.3 ± 4.4, 50.4 ± 5.9 and 67.7 ± 6.3 min, respectively. CONCLUSION We developed three bioanalytical assays for a novel direct thrombin inhibitor, variegin. The thrombin time assay is optimized for variegin quantitation during future porcine studies and clinical trials.
Collapse
|
15
|
De Nardi F, Lefort C, Bréard D, Richomme P, Legros C, Guérineau NC. Monitoring the Secretory Behavior of the Rat Adrenal Medulla by High-Performance Liquid Chromatography-Based Catecholamine Assay from Slice Supernatants. Front Endocrinol (Lausanne) 2017; 8:248. [PMID: 28993760 PMCID: PMC5622411 DOI: 10.3389/fendo.2017.00248] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 09/11/2017] [Indexed: 12/21/2022] Open
Abstract
Catecholamine (CA) secretion from the adrenal medullary tissue is a key step of the adaptive response triggered by an organism to cope with stress. Whereas molecular and cellular secretory processes have been extensively studied at the single chromaffin cell level, data available for the whole gland level are much scarcer. We tackled this issue in rat by developing an easy to implement experimental strategy combining the adrenal acute slice supernatant collection with a high-performance liquid chromatography-based epinephrine and norepinephrine (NE) assay. This technique affords a convenient method for measuring basal and stimulated CA release from single acute slices, allowing thus to individually address the secretory function of the left and right glands. Our data point that the two glands are equally competent to secrete epinephrine and NE, exhibiting an equivalent epinephrine:NE ratio, both at rest and in response to a cholinergic stimulation. Nicotine is, however, more efficient than acetylcholine to evoke NE release. A pharmacological challenge with hexamethonium, an α3-containing nicotinic acetylcholine receptor antagonist, disclosed that epinephrine- and NE-secreting chromaffin cells distinctly expressed α3 nicotinic receptors, with a dominant contribution in NE cells. As such, beyond the novelty of CA assays from acute slice supernatants, our study contributes at refining the secretory behavior of the rat adrenal medullary tissue, and opens new perspectives for monitoring the release of other hormones and transmitters, especially those involved in the stress response.
Collapse
Affiliation(s)
- Frédéric De Nardi
- Mitochondrial and Cardiovascular Pathophysiology – MITOVASC, CNRS UMR6015, INSERM U1083, UBL/Angers University, Angers, France
| | - Claudie Lefort
- Mitochondrial and Cardiovascular Pathophysiology – MITOVASC, CNRS UMR6015, INSERM U1083, UBL/Angers University, Angers, France
| | - Dimitri Bréard
- EA921, SONAS, SFR QUASAV, UBL/Angers University, Angers, France
| | - Pascal Richomme
- EA921, SONAS, SFR QUASAV, UBL/Angers University, Angers, France
| | - Christian Legros
- Mitochondrial and Cardiovascular Pathophysiology – MITOVASC, CNRS UMR6015, INSERM U1083, UBL/Angers University, Angers, France
- *Correspondence: Christian Legros, ; Nathalie C. Guérineau,
| | - Nathalie C. Guérineau
- Mitochondrial and Cardiovascular Pathophysiology – MITOVASC, CNRS UMR6015, INSERM U1083, UBL/Angers University, Angers, France
- *Correspondence: Christian Legros, ; Nathalie C. Guérineau,
| |
Collapse
|
16
|
Validated methods for determination of neurotransmitters and metabolites in rodent brain tissue and extracellular fluid by reversed phase UHPLC–MS/MS. J Chromatogr B Analyt Technol Biomed Life Sci 2016; 1028:120-129. [DOI: 10.1016/j.jchromb.2016.06.011] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 06/03/2016] [Accepted: 06/06/2016] [Indexed: 11/19/2022]
|
17
|
Selective solid-phase extraction of catecholamines from plasma using nanofibers doped with crown ether and their quantitation by HPLC with electrochemical detection. Anal Bioanal Chem 2016; 408:4987-94. [DOI: 10.1007/s00216-016-9596-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 04/19/2016] [Accepted: 04/21/2016] [Indexed: 11/26/2022]
|
18
|
Woo HI, Yang JS, Oh HJ, Cho YY, Kim JH, Park HD, Lee SY. A simple and rapid analytical method based on solid-phase extraction and liquid chromatography-tandem mass spectrometry for the simultaneous determination of free catecholamines and metanephrines in urine and its application to routine clinical analysis. Clin Biochem 2016; 49:573-9. [PMID: 26779993 DOI: 10.1016/j.clinbiochem.2016.01.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Revised: 12/22/2015] [Accepted: 01/12/2016] [Indexed: 11/17/2022]
Abstract
OBJECTIVES Urinary catecholamines and metanephrines are biochemical indicators of pheochromocytoma. We developed and validated a rapid and precise analytical method based on solid-phase extraction (SPE) and liquid chromatography separation coupled to tandem mass spectrometry (LC-MS/MS) for measuring urinary free catecholamines and metanephrines in a clinical setting. METHODS Following SPE purification of catecholamines and metanephrines from urine specimens, chromatographic separation and quantitative detection were performed using LC-MS/MS. The developed method for simultaneous measurement of urinary free catecholamines and metanephrines was validated with clinical urine specimens and was compared with other clinical and biochemical results, including urinary total metanephrines, vanillylmandelic acid (VMA), and plasma free metanephrines. RESULTS The performance of our newly developed method for measuring urinary free epinephrine (EPI), norepinephrine (NE), dopamine (DA), metanephrine (MN), and normetanephrine (NMN), was acceptable. The recoveries and matrix effects of analytes were 61-107% and 84.5-130.7%. The linear ranges of each analyte were 3.8-2163μg/L, 7.4-2,359μg/L, 5.4-2,825μg/L, 3.5-2,466μg/L, and 3.7-2,569μg/L, and the coefficients of variation (CV) were less than 10% with respect to imprecision. Carryover and sample stability were also validated. Validation using clinical urine specimens by comparison with various biochemical results showed that urinary free metanephrines had comparable sensitivity (100%) and superior specificity (97.1%) to urinary total and plasma free metanephrines. CONCLUSIONS The facile and reliable simultaneous measurement method for urinary free catecholamines and metanephrines using LC-MS/MS developed in this study is helpful in obtaining information about multiple metabolites and is applicable to routine clinical settings for the screening of pheochromocytoma.
Collapse
Affiliation(s)
- Hye In Woo
- Department of Laboratory Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Republic of Korea
| | - Jeong Soo Yang
- Clinical Trial Center, Clinical Research Institute, Samsung Medical Center, Seoul, Republic of Korea
| | - Hyeon Ju Oh
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Yoon Young Cho
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Jae Hyeon Kim
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Hyung-Doo Park
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Soo-Youn Lee
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea; Department of Clinical Pharmacology and Therapeutics, Samsung Medical Center, Seoul, Republic of Korea.
| |
Collapse
|
19
|
Davletbaeva P, Falkova M, Safonova E, Moskvin L, Bulatov A. Flow method based on cloud point extraction for fluorometric determination of epinephrine in human urine. Anal Chim Acta 2016; 911:69-74. [PMID: 26893087 DOI: 10.1016/j.aca.2015.12.045] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 12/19/2015] [Accepted: 12/22/2015] [Indexed: 12/01/2022]
Abstract
A novel stepwise injection fluorometric method for the determination of epinephrine in human urine has been developed. In the current study, the stepwise injection analysis (SWIA) was successfully combined with on-line in-syringe cloud point extraction (CPE) and fluorometric detection. The procedure was based on the epinephrine derivatization in the presence of o-phenylenediamine followed by the preconcentration stage based on the CPE with the nonionic surfactant Triton X-114. After the phase separation into a syringe of the flow system, the micellar phase containing the epinephrine derivative was transported to a fluorometric detector. The excitation and emission wavelengths were set at 447 nm and 550 nm, respectively. The conditions of epinephrine derivatization and CPE have been studied. The calibration plot constructed using the developed procedure was linear in the range of 1·10(-11)-5·10(-7) mol L(-1). The limit of detection, calculated as 3 σ of a blank test (n = 10), was found to be 3·10(-12) mol L(-1). The proposed method was successfully applied for the determination of epinephrine in human urine samples.
Collapse
Affiliation(s)
- Polina Davletbaeva
- Department of Analytical Chemistry, Institute of Chemistry, Saint-Petersburg University St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., St. Petersburg 199034 Russia.
| | - Marina Falkova
- Department of Analytical Chemistry, Institute of Chemistry, Saint-Petersburg University St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., St. Petersburg 199034 Russia
| | - Evgenia Safonova
- Department of Analytical Chemistry, Institute of Chemistry, Saint-Petersburg University St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., St. Petersburg 199034 Russia
| | - Leonid Moskvin
- Department of Analytical Chemistry, Institute of Chemistry, Saint-Petersburg University St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., St. Petersburg 199034 Russia
| | - Andrey Bulatov
- Department of Analytical Chemistry, Institute of Chemistry, Saint-Petersburg University St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., St. Petersburg 199034 Russia
| |
Collapse
|
20
|
Wang Y, Sun L, Yu B, Li S, Zhong S. One-pot preparation of boronic acid and PEG bi-functionalized silica particles for separation and purification of catecholamine from rat serum. NEW J CHEM 2015. [DOI: 10.1039/c5nj01965f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel boronate absorbent with the ability to resist protein adsorption was synthesized by a one step method.
Collapse
Affiliation(s)
- Yan Wang
- College of chemistry and Chemical Engineering
- Central South University
- Changsha
- China
| | - Lei Sun
- College of chemistry and Chemical Engineering
- Central South University
- Changsha
- China
| | - Bingqing Yu
- College of chemistry and Chemical Engineering
- Central South University
- Changsha
- China
| | - Shaotong Li
- College of chemistry and Chemical Engineering
- Central South University
- Changsha
- China
| | - Shian Zhong
- College of chemistry and Chemical Engineering
- Central South University
- Changsha
- China
| |
Collapse
|