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Jadeja S, Kupcik R, Fabrik I, Sklenářová H, Lenčo J. A stationary phase with a positively charged surface allows for minimizing formic acid concentration in the mobile phase, enhancing electrospray ionization in LC-MS proteomic experiments. Analyst 2023; 148:5980-5990. [PMID: 37870390 DOI: 10.1039/d3an01508d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2023]
Abstract
The default choice of mobile phase acidifier for bottom-up LC-MS proteomic analyses is 0.10% formic acid because of its decent acidity, decent ion pairing ability, and low suppression of electrospray ionization. In recent years, state-of-the-art columns have been designed specifically to provide efficient separation even when using an MS-friendly mobile phase of low ionic strength. Despite this, no attempts have been made to improve the sensitivity of the MS-based analytical methods by reducing the amount of formic acid in the mobile phase. In this study, we evaluated the effect of reduced formic acid concentration in the mobile phase on the chromatographic behavior and MS response of peptides when separated using columns packed with a C18 stationary phase with a positively charged surface. Using 0.01% formic acid in the mobile phase maintained excellent chromatographic performance and increased MS signal response compared to the standard of 0.10%. The enhanced MS response translated to about 50% improved peptide identifications depending on the complexity and amount of sample injected. The increased retention of peptides at a reduced formic acid concentration was directly proportional to the number of acidic residues in the peptide sequence. The study was carried out by covering a spectrum of protein samples with varied complexity using analytical flow, micro-, and nanoflow regimes to expand the applicability in routine practice.
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Affiliation(s)
- Siddharth Jadeja
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 03 Hradec Králové, Czech Republic.
| | - Rudolf Kupcik
- Biomedical Research Centre, University Hospital Hradec Králové, Sokolská 581, 500 05 Hradec Králové, Czech Republic
| | - Ivo Fabrik
- Biomedical Research Centre, University Hospital Hradec Králové, Sokolská 581, 500 05 Hradec Králové, Czech Republic
| | - Hana Sklenářová
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 03 Hradec Králové, Czech Republic.
| | - Juraj Lenčo
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 03 Hradec Králové, Czech Republic.
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Naplekov D, Jadeja S, Fučíková AM, Švec F, Sklenářová H, Lenčo J. Easy, Robust, and Repeatable Online Acid Cleavage of Proteins in Mobile Phase for Fast Quantitative LC-MS Bottom-Up Protein Analysis─Application for Ricin Detection. Anal Chem 2023; 95:12339-12348. [PMID: 37565982 PMCID: PMC10448442 DOI: 10.1021/acs.analchem.3c01772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 07/31/2023] [Indexed: 08/12/2023]
Abstract
Sample preparation involving the cleavage of proteins into peptides is the first critical step for successful bottom-up proteomics and protein analyses. Time- and labor-intensiveness are among the bottlenecks of the commonly used methods for protein sample preparation. Here, we report a fast online method for postinjection acid cleavage of proteins directly in the mobile phase typically used for LC-MS analyses in proteomics. The chemical cleavage is achieved in 0.1% formic acid within 35 s in a capillary heated to 195 °C installed upstream of the analytical column, enabling the generated peptides to be separated. The peptides generated by the optimized method covered the entire sequence except for one amino acid of trastuzumab used for the method development. The qualitative results are extraordinarily stable, even over a long period of time. Moreover, the method is also suitable for accurate and repeatable quantification. The procedure requires only one manual step, significantly decreasing sample transfer losses. To demonstrate its practical utility, we tested the method for the fast detection of ricin. Ricin can be unambiguously identified from an injection of 10 ng, and the results can be obtained within 7-8 min after receiving a suspicious sample. Because no sophisticated accessories and no additional reagents are needed, the method can be seamlessly transferred to any laboratory for high-throughput proteomic workflows.
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Affiliation(s)
- Denis
K. Naplekov
- Department
of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05 Hradec Králové, Czech Republic
| | - Siddharth Jadeja
- Department
of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05 Hradec Králové, Czech Republic
| | - Alena Myslivcová Fučíková
- Department
of Biology, Faculty of Science, University
of Hradec Králové, Hradecká 1285, 500 03 Hradec Králové, Czech Republic
| | - František Švec
- Department
of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05 Hradec Králové, Czech Republic
| | - Hana Sklenářová
- Department
of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05 Hradec Králové, Czech Republic
| | - Juraj Lenčo
- Department
of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05 Hradec Králové, Czech Republic
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Lenčo J, Jadeja S, Naplekov DK, Krokhin OV, Khalikova MA, Chocholouš P, Urban J, Broeckhoven K, Nováková L, Švec F. Reversed-Phase Liquid Chromatography of Peptides for Bottom-Up Proteomics: A Tutorial. J Proteome Res 2022; 21:2846-2892. [PMID: 36355445 DOI: 10.1021/acs.jproteome.2c00407] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The performance of the current bottom-up liquid chromatography hyphenated with mass spectrometry (LC-MS) analyses has undoubtedly been fueled by spectacular progress in mass spectrometry. It is thus not surprising that the MS instrument attracts the most attention during LC-MS method development, whereas optimizing conditions for peptide separation using reversed-phase liquid chromatography (RPLC) remains somewhat in its shadow. Consequently, the wisdom of the fundaments of chromatography is slowly vanishing from some laboratories. However, the full potential of advanced MS instruments cannot be achieved without highly efficient RPLC. This is impossible to attain without understanding fundamental processes in the chromatographic system and the properties of peptides important for their chromatographic behavior. We wrote this tutorial intending to give practitioners an overview of critical aspects of peptide separation using RPLC to facilitate setting the LC parameters so that they can leverage the full capabilities of their MS instruments. After briefly introducing the gradient separation of peptides, we discuss their properties that affect the quality of LC-MS chromatograms the most. Next, we address the in-column and extra-column broadening. The last section is devoted to key parameters of LC-MS methods. We also extracted trends in practice from recent bottom-up proteomics studies and correlated them with the current knowledge on peptide RPLC separation.
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Affiliation(s)
- Juraj Lenčo
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
| | - Siddharth Jadeja
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
| | - Denis K Naplekov
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
| | - Oleg V Krokhin
- Department of Internal Medicine, Manitoba Centre for Proteomics and Systems Biology, University of Manitoba, 799 JBRC, 715 McDermot Avenue, WinnipegR3E 3P4, Manitoba, Canada
| | - Maria A Khalikova
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
| | - Petr Chocholouš
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
| | - Jiří Urban
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00Brno, Czech Republic
| | - Ken Broeckhoven
- Department of Chemical Engineering (CHIS), Faculty of Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050Brussel, Belgium
| | - Lucie Nováková
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
| | - František Švec
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203/8, 500 05Hradec Králové, Czech Republic
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Al Shammari M, Helmi A, Jadeja S, Bartlett D, O'Toole S. The early wear susceptibility of cementum, enamel and dentine in vitro. J Dent 2022; 127:104339. [PMID: 36280007 DOI: 10.1016/j.jdent.2022.104339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 10/14/2022] [Accepted: 10/16/2022] [Indexed: 11/06/2022] Open
Abstract
OBJECTIVES To assess the differential early wear susceptibility of cementum, enamel and dentine at a micron level. METHODS Whole human molar buccal surfaces incorporating natural enamel and cementum (n = 20) confirmed by imaging (digital microscopy: Keyence, VHX-7000 Milton Keynes, UK), were mounted, scanned (profilometry: XYRIS 4000, Taicaan, Southampton, UK), and allocated to receive erosion (citric acid, pH 2.7, 30 min (n = 10)) or erosion/abrasion challenges (3 cycles of (citric acid, pH 2.7, 10 min, 60 300 g linear abrasion strokes), n=10). Samples were polished and the experiment repeated on polished enamel, and polished coronal and radicular dentine within the same tooth. Profilometric wear data were obtained using superimposition: GeoMagic (3Dsystems, Darmstadt, Germany) and subtraction: MountainsMap (DigitalSurf, Besancon, France). Data were normal. A general linear model was used to assess differences between groups and substrates. RESULTS The mean step height (SD) for natural enamel was 8.82 μm (2.53) for erosion and 11.48 μm (2.95) for erosion/abrasion. For natural cementum, the mean step height was 6.00 μm (2.29) for erosion and 4.67 μm (1.58) for erosion/abrasion. Dentine step heights ranged from 7.20 μm (1.53) for erosion and 9.79 μm (1.01) for erosion/abrasion with no statistical differences in dentine wear. Natural cementum surfaces had the lowest wear (p<0.001). Dentine had significantly less wear than natural enamel (p<0.02). CONCLUSIONS Cementum surfaces demonstrated the most wear resistance, followed by dentine under erosion dominant conditions in this in vitro study. Further in-vivo investigations are needed to confirm the intraoral stability of cementum. CLINICAL SIGNIFICANCE Cementum may be the least susceptible of dental substrates to wear and dentine does not wear at a faster rate than enamel under erosive conditions. This adds to our knowledge on the development of non-carious cervical lesions and questions whether wear rates will accelerate once dentine is exposed.
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Affiliation(s)
- M Al Shammari
- Centre for Clinical Oral and Translational Sciences, Faculty of Dental, Oral and Craniofacial Sciences, King's College London, UK
| | - A Helmi
- Centre for Clinical Oral and Translational Sciences, Faculty of Dental, Oral and Craniofacial Sciences, King's College London, UK
| | - S Jadeja
- Centre for Clinical Oral and Translational Sciences, Faculty of Dental, Oral and Craniofacial Sciences, King's College London, UK
| | - D Bartlett
- Centre for Clinical Oral and Translational Sciences, Faculty of Dental, Oral and Craniofacial Sciences, King's College London, UK
| | - S O'Toole
- Centre for Clinical Oral and Translational Sciences, Faculty of Dental, Oral and Craniofacial Sciences, King's College London, UK; School of Medicine, University College Dublin, Ireland.
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Jadeja S, Temiz LA, Dewan AK, Parker ER. A temporal cluster of cutaneous drug eruptions developing after initiation of hydroxychloroquine. Scand J Rheumatol 2022; 51:252-254. [PMID: 35142594 DOI: 10.1080/03009742.2021.2024018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- S Jadeja
- Department of Dermatology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - L A Temiz
- School of Medicine, Meharry Medical College, Nashville, TN, USA
| | - A K Dewan
- Department of Dermatology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - E R Parker
- Department of Dermatology, Vanderbilt University Medical Center, Nashville, TN, USA
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Dewan AK, Sowerby L, Jadeja S, Lian C, Wen P, Brown JR, Fisher DC, LeBoeuf NR. Pityriasis rubra pilaris-like erythroderma secondary to phosphoinositide 3-kinase inhibition. Clin Exp Dermatol 2018; 43:890-894. [PMID: 29851132 DOI: 10.1111/ced.13608] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/31/2017] [Indexed: 12/20/2022]
Abstract
BACKGROUND Phosphoinositide 3-kinase (PI3K) inhibitors are a class of small-molecule inhibitors approved for the treatment of certain leukaemias and lymphomas. Their dermatological adverse event profile is poorly described. AIM To characterize a rare cutaneous adverse event from PI3K inhibitors in order to help dermatologists and oncologists identify and effectively manage such eruptions. METHODS This was a retrospective analysis of patients receiving PI3K inhibitors referred to the Skin Toxicities Program in The Center for Cutaneous Oncology. RESULTS Three patients on PI3K inhibitors for treatment of malignancy developed diffuse erythroderma and keratoderma. Clinical and histopathological findings were consistent with pityriasis rubra pilaris (PRP)-like reactions. All patients improved with topical and oral corticosteroids, oral acitretin, and drug discontinuation. CONCLUSIONS PRP-like cutaneous eruptions may develop secondary to PI3K inhibition. Early dermatological evaluation of cutaneous toxicities to PI3K inhibitors as well as rapid initiation of disease-specific treatments may help keep patients on life-prolonging anti-cancer therapies.
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Affiliation(s)
- A K Dewan
- Department of Dermatology, The Center for Cutaneous Oncology, Dana-Farber Cancer Institute and Brigham and Women's Hospital, Boston, MA, USA
| | - L Sowerby
- Department of Dermatology, The Center for Cutaneous Oncology, Dana-Farber Cancer Institute and Brigham and Women's Hospital, Boston, MA, USA
| | - S Jadeja
- Department of Pathology, Brigham and Women's Hospital, Boston, MA, USA
| | - C Lian
- Department of Pathology, Brigham and Women's Hospital, Boston, MA, USA
| | - P Wen
- Department of Neuro-Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - J R Brown
- Chronic Lymphocytic Leukemia Center and Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - D C Fisher
- Division of Hematologic Malignancies and Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - N R LeBoeuf
- Department of Dermatology, The Center for Cutaneous Oncology, Dana-Farber Cancer Institute and Brigham and Women's Hospital, Boston, MA, USA
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Dewan AK, Pinard J, Jadeja S, Granter S, Merola JF. Erythema elevatum diutinum-like vasculitis secondary to cocaine adulterated with levamisole. Clin Exp Dermatol 2018; 43:494-496. [PMID: 29423942 DOI: 10.1111/ced.13392] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/10/2017] [Indexed: 11/27/2022]
Affiliation(s)
- A K Dewan
- Department of Dermatology, Brigham and Women's Hospital, Boston, MA, USA
| | - J Pinard
- Department of Dermatology, Brigham and Women's Hospital, Boston, MA, USA
| | - S Jadeja
- Department of Pathology, Brigham and Women's Hospital, Boston, MA, USA
| | - S Granter
- Department of Pathology, Brigham and Women's Hospital, Boston, MA, USA
| | - J F Merola
- Department of Dermatology, Brigham and Women's Hospital, Boston, MA, USA
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Jadeja S, Kulyadi GP, Badamane Sathyanarayana M. Adoption and Reasons for Withdrawal of ICH Q1F Guidelines. J Young Pharm 2016. [DOI: 10.5530/jyp.2016.4.31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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van Haelst M, Maiburg M, Baujat G, Jadeja S, Monti E, Bland E, Pearce K, Hennekam R, Scambler P. Molecular study of 33 families with Fraser syndrome new data and mutation review. Am J Med Genet A 2008; 146A:2252-7. [DOI: 10.1002/ajmg.a.32440] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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