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Oka Y, Takahashi K, Ohta T. The effects of vanilloid analogues structurally related to capsaicin on the transient receptor potential vanilloid 1 channel. Biochem Biophys Rep 2022; 30:101243. [PMID: 35280525 PMCID: PMC8914335 DOI: 10.1016/j.bbrep.2022.101243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 03/02/2022] [Accepted: 03/03/2022] [Indexed: 11/30/2022] Open
Abstract
Transient receptor potential vanilloid 1 (TRPV1) is known as a receptor of capsaicin, a spicy ingredient of chili peppers. It is also sensitive to a variety of pungent compounds and is involved in nociception. Here, we focused on the structural characteristics of capsaicin, and investigated whether vanillylmanderic acid (VMA), vanillic acid (VAcid), vanillyl alcohol (VAlc), vanillyl butyl ether (VBE), and vanillin, containing a vanillyl skeleton similar to capsaicin, affected the TRPV1 activities. For detection of TRPV1 activity, intracellular Ca2+ concentration ([Ca2+]i) was measured in HEK 293 cells heterologously expressing mouse TRPV1 (mTRPV1-HEK) and in mouse sensory neurons. Except for vanillin, four vanilloid analogues dose-dependently increased [Ca2+]i in mTRPV1-HEK. The solutions that dissolved VMA, VAcid and vanillin at high concentrations were acidic, whereas those of VAlc and VBE were neutral. Neutralized VAcid evoked [Ca2+]i increases but neutralized VMA did not. Mutation of capsaicin-sensing sites diminished [Ca2+]i responses to VAcid, VAlc and VBE. VAcid, VMA, and vanillin suppressed the activation of TRPV1 induced by capsaicin. VAcid and VMA also inhibited the acid-induced TRPV1 activation. In sensory neurons, VMA diminished TRPV1 activation by capsaicin or acids. The present data indicate that these structural characteristics of chemical compounds on TRPV1 may provide strategies for the development of novel analgesic drugs targeting nociceptive TRPV1.
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Key Words
- Catecholamine metabolites
- DMSO, Dimethyl sulfoxide
- DRG, Dorsal root ganglion
- HEK, Human embryonic kidney
- Heterologous expression
- Intracellular Ca2+ concentration
- Mutagenesis
- Sensory neurons
- TRPV, Transient receptor potential vanilloid 1
- VAcid, Vanillic acid
- VBE, Vanillyl butyl ether
- VMA, Vanillylmandelic acid
- Valc, Vanillyl alcohol
- Vanillyl structure
- [Ca2+], Intracellular Ca2+ concentration
- mTRPV1, Mouse TRPV1
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Affiliation(s)
- Y Oka
- Department of Veterinary Pharmacology, Faculty of Agriculture, Tottori University, Tottori, Japan
| | - K Takahashi
- Department of Veterinary Pharmacology, Faculty of Agriculture, Tottori University, Tottori, Japan.,Joint Graduate School of Veterinary Sciences, Gifu University, Tottori University, Tottori, Japan
| | - T Ohta
- Department of Veterinary Pharmacology, Faculty of Agriculture, Tottori University, Tottori, Japan.,Joint Graduate School of Veterinary Sciences, Gifu University, Tottori University, Tottori, Japan
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Moncer F, Adhoum N, Catak D, Monser L. Electrochemical sensor based on MIP for highly sensitive detection of 5-hydroxyindole-3-acetic acid carcinoid cancer biomarker in human biological fluids. Anal Chim Acta 2021; 1181:338925. [PMID: 34556226 DOI: 10.1016/j.aca.2021.338925] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 07/24/2021] [Accepted: 08/07/2021] [Indexed: 12/23/2022]
Abstract
An electrochemically synthetized nano-sensor based on molecularly imprinted polypyrrole (MIPPy) was successfully developed for the detection of 5-hydroxyindole-3-acetic acid (5-HIAA) in human biological fluids namely serum, urine, and plasma. The imprinted glassy carbon electrode was prepared by electropolymerisation of pyrrole via cyclic voltammetry (C.V). After completely leaching the imprinted molecules from the polymeric network, complementary cavities are created. The developed MIPPy sensor, under optimized conditions, shows a high sensitivity towards the target molecule (LOQ = 5 × 10-11 M). Moreover, it presents a wide linear response in the range of 5 × 10-11 - 5 × 10-5 M (R2 > 0.999) with a detection limit of 15 × 10-12 M. In order to evaluate the selectivity of the MIPPy film, several structural analogues and compounds forming the real matrices were tested. The obtained results show an excellent recovery rate (between 98.86 and 101.52%) proving the promising application of the proposed nano-sensor in the detection of 5-HIAA in human biological fluids without any significant interference recorded.
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Affiliation(s)
- Fatma Moncer
- EcoChimie Laboratory, Department of Chemical and Biological Engineering, National Institute of Applied Sciences and Technology, Carthage University, Tunisia; Laboratory of Electrochemistry, Materials, and Environment, UR16ES02, Preparatory School for Engineering Studies, Kairouan University, Tunisia.
| | - Nafaâ Adhoum
- Laboratory of Electrochemistry, Materials, and Environment, UR16ES02, Preparatory School for Engineering Studies, Kairouan University, Tunisia
| | - Darmin Catak
- National Centre for Nano Fabrication and Characterization, DTU Nanolab, Technical University of Denmark, Denmark
| | - Lotfi Monser
- EcoChimie Laboratory, Department of Chemical and Biological Engineering, National Institute of Applied Sciences and Technology, Carthage University, Tunisia; Laboratory of Electrochemistry, Materials, and Environment, UR16ES02, Preparatory School for Engineering Studies, Kairouan University, Tunisia.
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3
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Němečková-Makrlíková A, Barek J, Navrátil T, Fischer J, Vyskočil V, Dejmková H. Simultaneous determination of tumour biomarkers homovanillic acid, vanillylmandelic acid, and 5-hydroxyindole-3-acetic acid in human urine using single run HPLC with a simple wall-jet glassy carbon electrochemical detector. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114629] [Citation(s) in RCA: 4] [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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4
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Shen Y, Li H, Lu J, Luo X, Guan Q, Cheng L. Analytical validation and clinical application of urinary vanillylmandelic acid and homovanillic acid by LC-MS/MS for diagnosis of neuroblastoma. Biomed Chromatogr 2019; 33:e4484. [PMID: 30632178 DOI: 10.1002/bmc.4484] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 12/10/2018] [Accepted: 01/05/2019] [Indexed: 11/10/2022]
Abstract
Vanillylmandelic acid (VMA) and homovanillic acid (HVA) are clinical biomarkers for diagnosis of neuroblastoma (NB), which commonly occurs in the childhood. Development and application of a robust LC-MS/MS method for fast determination of these biomarkers for optimal laboratory testing of NB is essential in clinical laboratories. In present study, we developed and validated a simple liquid chromatography tandem mass spectrometry (LC-MS/MS) method for quick clinical testing of VMA and HVA for diagnosis of NB. The method was validated according to the current CLSI C62-A and FDA guidelines. The age-adjusted pediatric reference intervals and diagnostic performance were evaluated in both 24 h urine and random urine. Injection-to-injection time was 3.5 min. Inter- and intra-assay coefficients of variation (CVs) were ≤3.88%. The lower limit of quantification and the limit of detection were 0.50 and 0.25 μmol/L for both VMA and HVA. Recoveries of VMA and HVA were in the ranges of 85-109% and 86-100% with CVs ≤5.76%. This method was free from significant matrix effect, carryover and interference. The establishment of age-adjusted pediatric reference intervals by this LC-MS/MS method was favorable for the improvement in diagnostic performance, which was crucial for correct interpretation of test results from children in both 24 h and random urine.
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Affiliation(s)
- Ying Shen
- Department of Laboratory Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Huijun Li
- Department of Laboratory Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jie Lu
- Department of Laboratory Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xia Luo
- Department of Laboratory Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qing Guan
- Department of Laboratory Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Liming Cheng
- Department of Laboratory Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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5
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Shishkanova TV, Broncová G, Fitl P, Král V, Barek J. Voltammetric Detection of Catecholamine Metabolites Using Tröger's Base Modified Electrode. ELECTROANAL 2018. [DOI: 10.1002/elan.201700635] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Tatiana V. Shishkanova
- Department of Analytical Chemistry; University of Chemistry and Technology Prague; 166 28 Prague 6 Technická 5 Czech Republic
- Charles University, First Faculty of Medicine; 121 08 Prague 2 Kateřinská 32 Czech Republic
| | - Gabriela Broncová
- Department of Analytical Chemistry; University of Chemistry and Technology Prague; 166 28 Prague 6 Technická 5 Czech Republic
| | - Přemysl Fitl
- Department of Physics and Measurements; University of Chemistry and Technology Prague; 166 28 Prague 6 Technická 5 Czech Republic
| | - Vladimír Král
- Department of Analytical Chemistry; University of Chemistry and Technology Prague; 166 28 Prague 6 Technická 5 Czech Republic
- Charles University, First Faculty of Medicine; 121 08 Prague 2 Kateřinská 32 Czech Republic
| | - Jiří Barek
- Charles University, Faculty of Science, Department of Analytical Chemistry, UNESCO Laboratory of environmental electrochemistry; 128 43 Prague 2 Hlavova 2030 Czech Republic
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6
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Voltammetric and amperometric determination of selected catecholamine metabolites using glassy carbon paste electrode. MONATSHEFTE FUR CHEMIE 2017. [DOI: 10.1007/s00706-016-1902-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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7
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Amino-substituted Tröger’s base: electrochemical polymerization and characterization of the polymer film. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2016.12.061] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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8
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Shishkanová TV, Řezanková K, Řezanka P. Influence of surface properties on the deposition of a polyaniline film and detection of tumor markers. CHEMICAL PAPERS 2016. [DOI: 10.1007/s11696-016-0067-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Makrlíková A, Ktena E, Economou A, Fischer J, Navrátil T, Barek J, Vyskočil V. Voltammetric Determination of Tumor Biomarkers for Neuroblastoma (Homovanillic Acid, Vanillylmandelic Acid, and 5-Hydroxyindole-3-acetic Acid) at Screen-printed Carbon Electrodes. ELECTROANAL 2016. [DOI: 10.1002/elan.201600534] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Anna Makrlíková
- Charles University; Faculty of Science; Department of Analytical Chemistry; UNESCO Laboratory of Environmental Electrochemistry; Hlavova 8 128 43 Prague 2 Czech Republic
- J. Heyrovský Institute of Physical Chemistry of the AS CR, v.v.i.; Dolejškova 3 182 23 Prague 8 Czech Republic
| | - Evangelia Ktena
- National and Kapodistrian University of Athens; Department of Chemistry; Laboratory of Analytical Chemistry; Panepistimiopolis, Zografou 157 71 Athens Greece
| | - Anastasios Economou
- National and Kapodistrian University of Athens; Department of Chemistry; Laboratory of Analytical Chemistry; Panepistimiopolis, Zografou 157 71 Athens Greece
| | - Jan Fischer
- Charles University; Faculty of Science; Department of Analytical Chemistry; UNESCO Laboratory of Environmental Electrochemistry; Hlavova 8 128 43 Prague 2 Czech Republic
| | - Tomáš Navrátil
- J. Heyrovský Institute of Physical Chemistry of the AS CR, v.v.i.; Dolejškova 3 182 23 Prague 8 Czech Republic
| | - Jiří Barek
- Charles University; Faculty of Science; Department of Analytical Chemistry; UNESCO Laboratory of Environmental Electrochemistry; Hlavova 8 128 43 Prague 2 Czech Republic
| | - Vlastimil Vyskočil
- Charles University; Faculty of Science; Department of Analytical Chemistry; UNESCO Laboratory of Environmental Electrochemistry; Hlavova 8 128 43 Prague 2 Czech Republic
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10
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Shishkanova TV, Havlík M, Dendisová M, Matějka P, Král V. Synthesis and deposition of a Tröger’s base polymer on the electrode surface for potentiometric detection of a neuroblastoma tumor marker metabolite. Chem Commun (Camb) 2016; 52:11991-11994. [DOI: 10.1039/c6cc06203b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We propose an innovative approach to detect a low molecular weight metabolite of neuroblastoma.
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Affiliation(s)
- T. V. Shishkanova
- Department of Analytical Chemistry
- University of Chemistry and Technology in Prague
- Technická 5
- Czech Republic
| | - M. Havlík
- Department of Analytical Chemistry
- University of Chemistry and Technology in Prague
- Technická 5
- Czech Republic
| | - M. Dendisová
- Department of Physical Chemistry
- University of Chemistry and Technology in Prague
- Technická 5
- Czech Republic
| | - P. Matějka
- Department of Physical Chemistry
- University of Chemistry and Technology in Prague
- Technická 5
- Czech Republic
| | - V. Král
- Department of Analytical Chemistry
- University of Chemistry and Technology in Prague
- Technická 5
- Czech Republic
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11
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Cyclodextrin-modified MEKC method for quantification of selected acidic metabolites of catecholamines in the presence of various biogenic amines. Application to diagnosis of neuroblastoma. J Chromatogr B Analyt Technol Biomed Life Sci 2015; 1003:27-34. [DOI: 10.1016/j.jchromb.2015.09.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 09/01/2015] [Accepted: 09/04/2015] [Indexed: 11/19/2022]
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12
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Part CE, Kiddie JL, Hayes WA, Mills DS, Neville RF, Morton DB, Collins LM. Physiological, physical and behavioural changes in dogs (Canis familiaris) when kennelled: testing the validity of stress parameters. Physiol Behav 2014; 133:260-71. [PMID: 24866912 DOI: 10.1016/j.physbeh.2014.05.018] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 05/09/2014] [Accepted: 05/16/2014] [Indexed: 11/17/2022]
Abstract
Domestic dogs (Canis familiaris) housed in kennelling establishments are considered at risk of suffering poor welfare. Previous research supporting this hypothesis has typically used cortisol:creatinine ratios (C/Cr) to measure acute and chronic stress in kennelled dogs. However, the value of C/Cr as a welfare indicator has been questioned. This study aimed to test the validity of a range of physiological, physical and behavioural welfare indicators and to establish baseline values reflecting good dog welfare. Measurements were taken from 29 privately-owned dogs (14 males, 15 females), ranging in age and breed, in their own home and in a boarding kennel environment, following a within-subjects, counterbalanced design. Pairwise comparisons revealed that C/Cr and vanillylmandelic acid:creatinine ratios (VMA/Cr) were higher in the kennel than home environment (P=0.003; P=0.01, respectively) and were not associated with differences in movement/exercise between environments. Dogs' surface temperature was lower in kennels (P=0.001) and was not associated with ambient temperature. No association with age, or effects of kennel establishment, kennelling experience, sex or source were found. Dogs were generally more active in kennels, but showed considerable individual variability. C/Cr and 5-HIAA:creatinine ratios (5-HIAA/Cr) were negatively correlated with lip licking in kennels. Baseline values for each parameter are presented. The emotional valence of responses was ambiguous and no definitive evidence was found to suggest that dogs were negatively stressed by kennelling. It was concluded that C/Cr and, particularly, VMA/Cr and surface temperature provide robust indicators of psychological arousal in dogs, while spontaneous behaviour might be better used to facilitate interpretation of physiological and physical data on an individual level.
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Affiliation(s)
- C E Part
- School of Biological Sciences, Queen's University Belfast, Medical Biology Centre, Lisburn Road, Belfast BT7 9BL, UK
| | - J L Kiddie
- The Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield AL9 7TA, UK
| | - W A Hayes
- School of Life Sciences, University of Lincoln, Riseholme Park, Lincoln LN2 2LG, UK
| | - D S Mills
- School of Life Sciences, University of Lincoln, Riseholme Park, Lincoln LN2 2LG, UK
| | - R F Neville
- School of Life Sciences, University of Lincoln, Riseholme Park, Lincoln LN2 2LG, UK
| | - D B Morton
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - L M Collins
- School of Biological Sciences, Queen's University Belfast, Medical Biology Centre, Lisburn Road, Belfast BT7 9BL, UK.
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Monteleone M, Naccarato A, Sindona G, Tagarelli A. A reliable and simple method for the assay of neuroendocrine tumor markers in human urine by solid-phase microextraction-gas chromatography-triple quadrupole mass spectrometry. Anal Chim Acta 2012; 759:66-73. [PMID: 23260678 DOI: 10.1016/j.aca.2012.11.017] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Revised: 11/06/2012] [Accepted: 11/10/2012] [Indexed: 10/27/2022]
Abstract
Homovanillic acid (HVA), vanylmandelic acid (VMA), and 5-hydroxyindoleacetic acid (5-HIAA) are the metabolites of some catecholamines such as epinephrine, nor-epinephrine, dopamine and serotonin and their quantification is used in the diagnosis and management of patients with neurocrine tumors. A novel approach in the assay of these biomarkers in human urine samples by solid phase microextraction (SPME) combined with gas chromatography-triple quadrupole mass spectrometry (GC-QqQ-MS) is presented. A preliminary derivatization with ethyl chloroformate/ethanol was used and the corresponding derivatives were then extracted by SPME in immersion mode. The performance of five SPME fibers and three chloroformates were evaluated in univariate mode and the best results were obtained using the polyacrylate fiber and ethyl chloroformate. The variables affecting the efficiency of SPME analysis were optimized by the multivariate approach of "Experimental design" and, in particular, a central composite design (CCD) was applied. The optimum working conditions in terms of response values were achieved by performing analysis at room temperature with addition of NaCl (9.5%) and with an extraction time of 25.8 min. Identification and quantification of analytes were carried out by using a gas chromatography-triple quadrupole mass spectrometry (GC-QqQ MS) system in multiple reaction monitoring (MRM) acquisition. An evaluation of all analytical parameters shows that the proposed method provides satisfactory results. Very good linearities were, in fact, achieved in the tested calibration ranges with correlation coefficient values >0.99 for all the analytes and accuracies and RSDs calculated for between-run and tested at concentrations of 1, 10, and 80 mg L(-1) were ranging from 91.3% to 106.6%, and from 0.5 to 8.9%, respectively. Moreover, the LOD values obtained can be considered very satisfactory (1.3, 0.046 and 24.3 μg L(-1) for HVA, VMA and 5-HIAA, respectively). The developed protocol represents, therefore, a simple, rapid and selective tool for assaying these acidic biomarkers in urine samples for neuroendocrine cancer diagnosis.
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Affiliation(s)
- Marcello Monteleone
- Dipartimento di Chimica, Università della Calabria, Via Pietro Bucci Cubo 12/C, I-87030 Arcavacata di Rende (CS), Italy
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Simultaneous detection of diagnostic biomarkers of alkaptonuria, ornithine carbamoyltransferase deficiency, and neuroblastoma disease by high-performance liquid chromatography/tandem mass spectrometry. Clin Chim Acta 2012; 420:140-5. [PMID: 23085206 DOI: 10.1016/j.cca.2012.10.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 10/10/2012] [Indexed: 11/23/2022]
Abstract
BACKGROUND Urinary homovanillic acid (HVA)/vanillylmandelic acid (VMA), orotic acid (OA), and homogentisic acid (HGA) are diagnostic biomarkers of neuroblastoma, ornithine carbamoyl transferase deficiency (OCTD), and alkaptonuria (AKU), respectively. In this study, a high-performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for simultaneous quantification of HVA, VMA, OA, and HGA in urine. METHODS After sample preparation, which involved only the dilution procedure, samples were quantified by LC-MS/MS. Full-scan MS/MS mode enabled the urinary markers to be quantified with a high degree of specificity and sensitivity. Rather than using a separate enzymatic method to normalize the concentration of creatinine in urine, we quantified the level of creatinine in urine in one LC-MS run. RESULTS The limits of detection were 10 μg/l for HGA, 25 μg/l for HVA/VMA, and 50 μg/l for OA with a single-to-noise ratio of 3; the limits of quantification were 50 μg/l for HVA and HGA, 100 μg/l for VMA, and 250 μg/l for OA. The linear dynamic range for quantification of the analytes covered 2 to 3 orders of magnitude, depending on the analyte. The relative standard deviation of the developed LC-MS/MS method was less than 4% for the intra-day validation and 10% for the inter-day validation. CONCLUSIONS The results show that our LC-MS/MS technique is a highly sensitive and rapid method for screening for biomarkers that are diagnostic of three metabolic diseases.
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Scapolla C, Cangemi G, Barco S, Barbagallo L, Bugnone D, Maffia A, Melioli G, Profumo A, Benatti U, Damonte G. Identification and structural characterization by LC-ESI-IONTRAP and LC-ESI-TOF of some metabolic conjugation products of homovanillic acid in urine of neuroblastoma patients. JOURNAL OF MASS SPECTROMETRY : JMS 2012; 47:816-824. [PMID: 22791248 DOI: 10.1002/jms.3016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The levels of urinary catecholamine metabolites, such as homovanillic acid (HVA) and vanillylmandelic acid, are routinely used as a clinical tool in the diagnosis and follow-up of neuroblastoma (NB) patients. Recently, in the Clinical Pathology Laboratory Unit of G. Gaslini Children Hospital, a commercial method that employs liquid chromatography coupled to electrochemical detection (LC-EC) has been introduced for the measurement of these metabolites in the routine laboratory practice. Using this LC-EC method, an unknown peak could be observed only in samples derived from NB patients. To investigate the nature of this peak, we used a combination of liquid chromatography-time-of-flight mass spectrometry (LC-TOF-MS) and liquid chromatography-ion trap tandem mass spectrometry (LC-IT-MS). The first approach was used to obtain the elemental composition of the ions present in this new signal. To get additional structural information useful for the elucidation of unknown compounds, the ion trap analyzer was exploited. We were able to identify not just one, but three unknown signals in urine samples from NB patients which corresponded to three conjugated products of HVA: HVA sulfate and two glucuronoconjugate isomers. The enzymatic hydrolysis with β-glucuronidase confirmed the proposed structures, while the selective alkaline hydrolysis allowed us to distinguish the difference between phenol- and acyl-glucuronide of HVA. The latter was the unknown peak observed in LC-EC separations of urine samples from NB patients.
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Affiliation(s)
- Carlo Scapolla
- Department of Chemistry and Industrial Chemistry, University of Genoa, Via Dodecaneso 31, 16146, Genoa, Italy
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Kim MJ, Kim BK, Kim SM, Park JS, Hong JK. Profiling analysis of catecholamines and polyamines in biological samples. ANALYTICAL SCIENCE AND TECHNOLOGY 2011. [DOI: 10.5806/ast.2011.24.5.319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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The potential and application of microfluidic paper-based separation devices. Bioanalysis 2011; 2:1663-5. [PMID: 21083315 DOI: 10.4155/bio.10.138] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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