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Titaux-Delgado G, Lopez-Giraldo AE, Carrillo E, Cofas-Vargas LF, Carranza LE, López-Vera E, García-Hernández E, Del Rio-Portilla F. Beta-KTx14.3, a scorpion toxin, blocks the human potassium channel KCNQ1. BIOCHIMICA ET BIOPHYSICA ACTA. PROTEINS AND PROTEOMICS 2023; 1871:140906. [PMID: 36918120 DOI: 10.1016/j.bbapap.2023.140906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 02/25/2023] [Accepted: 03/06/2023] [Indexed: 03/14/2023]
Abstract
Potassium channels play a key role in regulating many physiological processes, thus, alterations in their proper functioning can lead to the development of several diseases. Hence, the search for compounds capable of regulating the activity of these channels constitutes an intense field of investigation. Potassium scorpion toxins are grouped into six subfamilies (α, β, γ, κ, δ, and λ). However, experimental structures and functional analyses of the long chain β-KTx subfamily are lacking. In this study, we recombinantly produced the toxins TcoKIK and beta-KTx14.3 present in the venom of Tityus costatus and Lychas mucronatus scorpions, respectively. The 3D structures of these β-KTx toxins were determined by nuclear magnetic resonance. In both toxins, the N-terminal region is unstructured, while the C-terminal possesses the classic CSα/β motif. TcoKIK did not show any clear activity against frog Shaker and human KCNQ1 potassium channels; however, beta-KTx14.3 was able to block the KCNQ1 channel. The toxin-channel interaction mode was investigated using molecular dynamics simulations. The results showed that this toxin could form a stable network of polar-to-polar and hydrophobic interactions with KCNQ1, involving key conserved residues in both molecular partners. The discovery and characterization of a toxin capable of inhibiting KCNQ1 pave the way for the future development of novel drugs for the treatment of human diseases caused by the malfunction of this potassium channel. STATEMENT OF SIGNIFICANCE: Scorpion toxins have been shown to rarely block human KCNQ1 channels, which participate in the regulation of cardiac processes. In this study, we obtained recombinant beta-KTx14.3 and TcoKIK toxins and determined their 3D structures by nuclear magnetic resonance. Electrophysiological studies and molecular dynamics models were employed to examine the interactions between these two toxins and the human KCNQ1, which is the major driver channel of cardiac repolarization; beta-KTx14.3 was found to block effectively this channel. Our findings provide insights for the development of novel toxin-based drugs for the treatment of cardiac channelopathies involving KCNQ1-like channels.
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Affiliation(s)
- Gustavo Titaux-Delgado
- Departamento de Química de Biomacromoléculas, Instituto de Química, Universidad Nacional Autónoma de México, CU, Ciudad de México 04510, Mexico
| | - Andrea Estefanía Lopez-Giraldo
- Departamento de Química de Biomacromoléculas, Instituto de Química, Universidad Nacional Autónoma de México, CU, Ciudad de México 04510, Mexico
| | - Elisa Carrillo
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center, Houston, TX 77030, USA
| | - Luis Fernando Cofas-Vargas
- Departamento de Química de Biomacromoléculas, Instituto de Química, Universidad Nacional Autónoma de México, CU, Ciudad de México 04510, Mexico
| | - Luis Enrique Carranza
- Departamento de Química de Biomacromoléculas, Instituto de Química, Universidad Nacional Autónoma de México, CU, Ciudad de México 04510, Mexico
| | - Estuardo López-Vera
- Laboratorio de Toxinología Marina, Unidad Académica de Ecología y Biodiversidad Acuática, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México 04510, Mexico
| | - Enrique García-Hernández
- Departamento de Química de Biomacromoléculas, Instituto de Química, Universidad Nacional Autónoma de México, CU, Ciudad de México 04510, Mexico.
| | - Federico Del Rio-Portilla
- Departamento de Química de Biomacromoléculas, Instituto de Química, Universidad Nacional Autónoma de México, CU, Ciudad de México 04510, Mexico.
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2
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Liepold T, Klafki HW, Kumar S, Walter J, Wirths O, Wiltfang J, Jahn O. Matrix Development for the Detection of Phosphorylated Amyloid-β Peptides by MALDI-TOF-MS. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2023; 34:505-512. [PMID: 36706152 PMCID: PMC9983008 DOI: 10.1021/jasms.2c00270] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 12/20/2022] [Accepted: 01/18/2023] [Indexed: 06/18/2023]
Abstract
Amyloid-β (Aβ) peptides, including post-translationally modified variants thereof, are believed to play a key role in the onset and progression of Alzheimer's disease. Suggested modified Aβ species with potential disease relevance include Aβ peptides phosphorylated at serine in position eight (pSer8-Aβ) or 26 (pSer26-Aβ). However, the published studies on those Aβ peptides essentially relied on antibody-based approaches. Thus, complementary analyses by mass spectrometry, as shown for other modified Aβ variants, will be necessary not only to unambiguously verify the existence of phosphorylated Aβ species in brain samples but also to reveal their exact identity as to phosphorylation sites and potential terminal truncations. With the aim of providing a novel tool for addressing this still-unresolved issue, we developed a customized matrix formulation, referred to as TOPAC, that allows for improved detection of synthetic phosphorylated Aβ species by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. When TOPAC was compared with standard matrices, we observed higher signal intensities but minimal methionine oxidation and phosphate loss for intact pSer8-Aβ(1-40) and pSer26-Aβ(1-40). Similarly, TOPAC also improved the mass spectrometric detection and sequencing of the proteolytic cleavage products pSer8-Aβ(1-16) and pSer26-Aβ(17-28). We expect that TOPAC will facilitate future efforts to detect and characterize endogenous phosphorylated Aβ species in biological samples and that it may also find its use in phospho-proteomic approaches apart from applications in the Aβ field.
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Affiliation(s)
- Thomas Liepold
- Neuroproteomics
Group, Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, 37075 Goettingen, Germany
| | - Hans-Wolfgang Klafki
- Department
of Psychiatry and Psychotherapy, University Medical Center Goettingen, Georg-August-University, 37075 Goettingen, Germany
| | - Sathish Kumar
- Department
of Neurology, University of Bonn, 53127 Bonn, Germany
| | - Jochen Walter
- Department
of Neurology, University of Bonn, 53127 Bonn, Germany
| | - Oliver Wirths
- Department
of Psychiatry and Psychotherapy, University Medical Center Goettingen, Georg-August-University, 37075 Goettingen, Germany
| | - Jens Wiltfang
- Department
of Psychiatry and Psychotherapy, University Medical Center Goettingen, Georg-August-University, 37075 Goettingen, Germany
| | - Olaf Jahn
- Neuroproteomics
Group, Department of Molecular Neurobiology, Max Planck Institute for Multidisciplinary Sciences, 37075 Goettingen, Germany
- Department
of Psychiatry and Psychotherapy, University Medical Center Goettingen, Georg-August-University, 37075 Goettingen, Germany
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3
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Krishnan V, Meehan S, Hayter C, Bhattacharya SK. Analyses and Localization of Serotonin and L-DOPA in Ocular Tissues by Imaging Mass Spectrometry. Methods Mol Biol 2023; 2571:157-168. [PMID: 36152160 DOI: 10.1007/978-1-0716-2699-3_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Imaging mass spectrometry (IMS) allows for visualization of the spatial distribution of proteins, lipids, and other metabolites in a targeted or untargeted approach. The identification of compounds through mass spectrometry combined with the mapping of compound distribution in the sample establishes IMS as a powerful tool for metabolomics. IMS analysis for serotonin will allow researchers to pinpoint areas of deficiencies or accumulations associated with ocular disorders such as serotonin selective reuptake inhibitor optic neuropathy. Furthermore, L-DOPA has shown great promise as a therapeutic approach for disorders such as age-related macular degeneration, and IMS allows for localization, and relative magnitudes, of L-DOPA in the eye. We describe here an end-to-end approach of IMS from sample preparation to data analysis for serotonin and L-DOPA analysis.
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Affiliation(s)
- Varun Krishnan
- Bascom Palmer Eye Institute, Miller School of Medicine, University of Miami, Miami, FL, USA
- Miami Integrative Metabolomics Research Center, Miami, FL, USA
- University of Miami Miller School of Medicine, Miami, FL, USA
| | - Sean Meehan
- Bascom Palmer Eye Institute, Miller School of Medicine, University of Miami, Miami, FL, USA
- Miami Integrative Metabolomics Research Center, Miami, FL, USA
- University of Miami Miller School of Medicine, Miami, FL, USA
| | - Colin Hayter
- Bascom Palmer Eye Institute, Miller School of Medicine, University of Miami, Miami, FL, USA
- Miami Integrative Metabolomics Research Center, Miami, FL, USA
- University of Miami Miller School of Medicine, Miami, FL, USA
| | - Sanjoy K Bhattacharya
- Bascom Palmer Eye Institute, Miller School of Medicine, University of Miami, Miami, FL, USA.
- Miami Integrative Metabolomics Research Center, Miami, FL, USA.
- University of Miami Miller School of Medicine, Miami, FL, USA.
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4
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Jiang J, Stührwohldt N, Liu T, Huang Q, Li L, Zhang L, Gu H, Fan L, Zhong S, Schaller A, Qu LJ. Egg cell-secreted aspartic proteases ECS1/2 promote gamete attachment to prioritize the fertilization of egg cells over central cells in Arabidopsis. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2022; 64:2047-2059. [PMID: 36165344 DOI: 10.1111/jipb.13371] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
Double fertilization is an innovative phenomenon in angiosperms, in which one sperm cell first fuses with the egg cell to produce the embryo, and then the other sperm fuses with the central cell to produce the endosperm. However, the molecular mechanism of the preferential fertilization of egg cells is poorly understood. In this study, we report that two egg cell-secreted aspartic proteases, ECS1 and ECS2, play an important role in promoting preferential fertilization of egg cells in Arabidopsis. We show that simultaneous loss of ECS1 and ECS2 function resulted in an approximately 20% reduction in fertility, which can be complemented by the full-length ECS1/2 but not by corresponding active site mutants or by secretion-defective versions of ECS1/2. Detailed phenotypic analysis revealed that the egg cell-sperm cell attachment was compromised in ecs1 ecs2 siliques. Limited pollination assays with cyclin-dependent kinase a1 (cdka;1) pollen showed that preferential egg cell fertilization was impaired in the ecs1 ecs2 mutant. Taken together, these results demonstrate that egg cells secret two aspartic proteases, ECS1 and ECS2, to facilitate the attachment of sperm cells to egg cells so that preferential fertilization of egg cells is achieved. This study reveals the molecular mechanism of preferential fertilization in Arabidopsis thaliana.
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Affiliation(s)
- Jiahao Jiang
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing, 100871, China
| | - Nils Stührwohldt
- Department of Plant Physiology and Biochemistry, Institute of Biology, University of Hohenheim, Stuttgart, 70593, Germany
| | - Tianxu Liu
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing, 100871, China
| | - Qingpei Huang
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing, 100871, China
| | - Ling Li
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing, 100871, China
| | - Li Zhang
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing, 100871, China
| | - Hongya Gu
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing, 100871, China
| | - Liumin Fan
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing, 100871, China
| | - Sheng Zhong
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing, 100871, China
| | - Andreas Schaller
- Department of Plant Physiology and Biochemistry, Institute of Biology, University of Hohenheim, Stuttgart, 70593, Germany
| | - Li-Jia Qu
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing, 100871, China
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5
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Marín V, Bart B, Cortez N, Jiménez VA, Silva V, Leyton O, Cabrera-Pardo JR, Schmidt B, Heydenreich M, Burgos V, Paz C. Drimane Sesquiterpene Aldehydes Control Candida Yeast Isolated from Candidemia in Chilean Patients. Int J Mol Sci 2022; 23:ijms231911753. [PMID: 36233069 PMCID: PMC9570005 DOI: 10.3390/ijms231911753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 09/20/2022] [Accepted: 09/22/2022] [Indexed: 11/18/2022] Open
Abstract
Drimys winteri J.R. (Winteraceae) produce drimane sesquiterpenoids with activity against Candida yeast. In this work, drimenol, polygodial (1), isotadeonal (2), and a new drimane α,β-unsaturated 1,4-dialdehyde, named winterdial (4), were purified from barks of D. winteri. The oxidation of drimenol produced the monoaldehyde drimenal (3). These four aldehyde sesquiterpenoids were evaluated against six Candida species isolated from candidemia patients in Chilean hospitals. Results showed that 1 displays fungistatic activity against all yeasts (3.75 to 15.0 µg/mL), but irritant effects on eyes and skin, whereas its non-pungent epimer 2 has fungistatic and fungicide activities at 1.9 and 15.0 µg/mL, respectively. On the other hand, compounds 3 and 4 were less active. Molecular dynamics simulations suggested that compounds 1–4 are capable of binding to the catalytic pocket of lanosterol 14-alpha demethylase with similar binding free energies, thus suggesting a potential mechanism of action through the inhibition of ergosterol synthesis. According to our findings, compound 2 appears as a valuable molecular scaffold to pursue the future development of more potent drugs against candidiasis with fewer side effects than polygodial. These outcomes are significant to broaden the alternatives to treat fungal infections with increasing prevalence worldwide using natural compounds as a primary source for active compounds.
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Affiliation(s)
- Víctor Marín
- Laboratory of Natural Products & Drug Discovery, Department of Basic Science, Center CEBIM, Universidad de La Frontera, Av. Francisco Salazar 01145, Temuco 4811230, Chile
| | - Bryan Bart
- Laboratory of Natural Products & Drug Discovery, Department of Basic Science, Center CEBIM, Universidad de La Frontera, Av. Francisco Salazar 01145, Temuco 4811230, Chile
| | - Nicole Cortez
- Laboratory of Natural Products & Drug Discovery, Department of Basic Science, Center CEBIM, Universidad de La Frontera, Av. Francisco Salazar 01145, Temuco 4811230, Chile
| | - Verónica A. Jiménez
- Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Sede Concepción, Autopista Concepción-Talcahuano 7100, Talcahuano 4260000, Chile
| | - Víctor Silva
- Tecnología Médica, Facultad de Salud, Universidad Santo Tomás, Temuco 4780000, Chile
| | - Oscar Leyton
- Tecnología Médica, Facultad de Salud, Universidad Santo Tomás, Temuco 4780000, Chile
| | - Jaime R. Cabrera-Pardo
- Laboratorio de Química Aplicada y Sustentable, Departamento de Química, Facultad de Ciencias, Universidad de Tarapacá, Arica 1000000, Chile
| | - Bernd Schmidt
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, D-14476 Potsdam, Germany
| | - Matthias Heydenreich
- Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, D-14476 Potsdam, Germany
| | - Viviana Burgos
- Departamento de Ciencias Básicas, Universidad Santo Tomás, Temuco 4780000, Chile
- Correspondence: (V.B.); (C.P.)
| | - Cristian Paz
- Laboratory of Natural Products & Drug Discovery, Department of Basic Science, Center CEBIM, Universidad de La Frontera, Av. Francisco Salazar 01145, Temuco 4811230, Chile
- Correspondence: (V.B.); (C.P.)
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6
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Zubair F. MALDI mass Spectrometry based proteomics for drug discovery & development. DRUG DISCOVERY TODAY. TECHNOLOGIES 2021; 40:29-35. [PMID: 34916018 DOI: 10.1016/j.ddtec.2021.09.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 09/08/2021] [Accepted: 09/08/2021] [Indexed: 12/19/2022]
Abstract
Matrix-assisted laser desorption/ ionization (MALDI) is a soft ionization technique for introducing wide range of analytes into a mass spectrometer (MS). MALDI MS is a powerful tool in drug discovery research and development, providing a high-throughput molecular analysis technique in both preclinical and clinical systems. In particular, MALDI MS is invaluable in the study of peptides and proteins that drive all biological functions. This technology is label-free, provides high specificity in molecular identification, and is high-throughput. MALDI MS has been used in biomarker discovery and quantitation in virtually all tissues, serum, plasma, CSF, and urine for diagnostics, patient stratification, and monitoring drug efficacy. Other applications include characterization of biological drugs, spatial mapping of biomarkers and drugs in tissues, drug screening, and toxicological assessment.
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7
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Pathmasiri KC, Nguyen TTA, Khamidova N, Cologna SM. Mass spectrometry-based lipid analysis and imaging. CURRENT TOPICS IN MEMBRANES 2021; 88:315-357. [PMID: 34862030 DOI: 10.1016/bs.ctm.2021.10.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mass spectrometry imaging (MSI) is a powerful tool for in situ mapping of analytes across a sample. With growing interest in lipid biochemistry, the ability to perform such mapping without antibodies has opened many opportunities for MSI and lipid analysis. Herein, we discuss the basics of MSI with particular emphasis on MALDI mass spectrometry and lipid analysis. A discussion of critical advancements as well as protocol details are provided to the reader. In addition, strategies for improving the detection of lipids, as well as applications in biomedical research, are presented.
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Affiliation(s)
- Koralege C Pathmasiri
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Thu T A Nguyen
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Nigina Khamidova
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Stephanie M Cologna
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL, United States; Laboratory of Integrated Neuroscience, University of Illinois at Chicago, Chicago, IL, United States.
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8
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Lee PY, Yeoh Y, Omar N, Pung YF, Lim LC, Low TY. Molecular tissue profiling by MALDI imaging: recent progress and applications in cancer research. Crit Rev Clin Lab Sci 2021; 58:513-529. [PMID: 34615421 DOI: 10.1080/10408363.2021.1942781] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Matrix-assisted laser desorption/ionization (MALDI) imaging is an emergent technology that has been increasingly adopted in cancer research. MALDI imaging is capable of providing global molecular mapping of the abundance and spatial information of biomolecules directly in the tissues without labeling. It enables the characterization of a wide spectrum of analytes, including proteins, peptides, glycans, lipids, drugs, and metabolites and is well suited for both discovery and targeted analysis. An advantage of MALDI imaging is that it maintains tissue integrity, which allows correlation with histological features. It has proven to be a valuable tool for probing tumor heterogeneity and has been increasingly applied to interrogate molecular events associated with cancer. It provides unique insights into both the molecular content and spatial details that are not accessible by other techniques, and it has allowed considerable progress in the field of cancer research. In this review, we first provide an overview of the MALDI imaging workflow and approach. We then highlight some useful applications in various niches of cancer research, followed by a discussion of the challenges, recent developments and future prospect of this technique in the field.
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Affiliation(s)
- Pey Yee Lee
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Yeelon Yeoh
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Nursyazwani Omar
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Yuh-Fen Pung
- Division of Biomedical Science, University of Nottingham Malaysia, Selangor, Malaysia
| | - Lay Cheng Lim
- Department of Life Sciences, School of Pharmacy, International Medical University (IMU), Kuala Lumpur, Malaysia
| | - Teck Yew Low
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
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9
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Gu H, Ma K, Zhao W, Qiu L, Xu W. A general purpose MALDI matrix for the analyses of small organic, peptide and protein molecules. Analyst 2021; 146:4080-4086. [PMID: 34052846 DOI: 10.1039/d1an00474c] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) has been widely applied for the analysis of large biomolecules. The emergence of inorganic material substrates and new organic matrices extends the use of MALDI MS for small molecule analyses. However, there are usually preferred matrices for different types of analytes. Here, an organic compound, 4-hydroxy-3-nitrobenzonitrile, was found to be a general purpose matrix for the analyses of small organic, peptide and protein molecules. In particular, 4-hydroxy-3-nitrobenzonitrile has a strong UV absorption property, and it provides a clean background in the low mass range. Its analytical performances as a UV-laser matrix were demonstrated for different types of analytes, including organic drugs, peptides, proteins, mouse brain tissue and bacteria. Compared with commercial matrices, this new matrix has better performances when analyzing small molecules, such as drugs, peptides and lipids, while it has similar performances when analyzing proteins.
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Affiliation(s)
- Hao Gu
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China.
| | - Kang Ma
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China.
| | - Weiqian Zhao
- School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
| | - Lirong Qiu
- School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
| | - Wei Xu
- School of Life Science, Beijing Institute of Technology, Beijing 100081, China.
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Yerra NV, Dyaga B, Dadinaboyina SB, Pandeti S, Vaidya JR, Tabet JC, Thota JR. 2-Cyano-3-(2-thienyl)acrylic Acid as a New MALDI Matrix for the Analysis of a Broad Spectrum of Analytes. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2021; 32:387-393. [PMID: 33274936 DOI: 10.1021/jasms.0c00398] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A low-cost synthetic 2-cyano-3-(2-thienyl)acrylic acid (CTA) is developed as a new MALDI matrix for the analysis of various classes of compounds such as lipids (e.g., fatty acids), peptides, proteins, saccharides, natural products (i.e., iridoids), PEGs, and organometallics in the positive-ion mode. The difficulty in the analysis of high molecular mass PEGs was overcome by using CTA as matrix even at low concentrations. Both high molecular mass proteins and peptides were successfully analyzed using CTA. The mass spectra of all of the studied analytes with CTA showed high signal-to-noise (S/N) ratios and spectral resolutions when compared to other conventional matrices such as SA, DHB, DT, and HCCA. However, in the case of peptide analysis with CTA, the resulting mass spectra are found to be similar to that of the well-established HCCA matrix. On the basis of the physicochemical properties of the analytes, the CTA works as a proton/cation or electron-transfer matrix. It proves that the CTA can be used as a common matrix for the analysis of majority classes of analytes instead of using a specific matrix for the particular class of analytes. Further, the CTA provides an advantage in the analysis of unknown samples as it rules out ambiguity in the selection of particular matrix and it may also offer a complete profile of the tissue surface in the MALDI-imaging experiments.
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Affiliation(s)
- Naga Veera Yerra
- Department of Analytical and Structural Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Bharath Dyaga
- Fluoro Agrochemicals Division, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India
| | - S Babu Dadinaboyina
- Department of Analytical and Structural Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sukanya Pandeti
- Department of Analytical and Structural Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Jayathirtha Rao Vaidya
- Fluoro Agrochemicals Division, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Jean-Claude Tabet
- Sorbonne Universités, Campus Pierre et Marie Curie, IPCM, 4 place Jussieu, Paris 75252 Cedex 05, France
- Université Paris-Saclay, CEA, INRAE, Médicaments et Technologies pour la Santé (MTS), MetaboHUB, 91191 Gif-sur-Yvette, France
| | - Jagadeshwar Reddy Thota
- Department of Analytical and Structural Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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11
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Dannhorn A, Kazanc E, Ling S, Nikula C, Karali E, Serra MP, Vorng JL, Inglese P, Maglennon G, Hamm G, Swales J, Strittmatter N, Barry ST, Sansom OJ, Poulogiannis G, Bunch J, Goodwin RJ, Takats Z. Universal Sample Preparation Unlocking Multimodal Molecular Tissue Imaging. Anal Chem 2020; 92:11080-11088. [PMID: 32519547 DOI: 10.1021/acs.analchem.0c00826] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A new tissue sample embedding and processing method is presented that provides downstream compatibility with numerous different histological, molecular biology, and analytical techniques. The methodology is based on the low temperature embedding of fresh frozen specimens into a hydrogel matrix composed of hydroxypropyl methylcellulose (HPMC) and polyvinylpyrrolidone (PVP) and sectioning using a cryomicrotome. The hydrogel was expected not to interfere with standard tissue characterization methods, histologically or analytically. We assessed the compatibility of this protocol with various mass spectrometric imaging methods including matrix-assisted laser desorption ionization (MALDI), desorption electrospray ionization (DESI) and secondary ion mass spectrometry (SIMS). We also demonstrated the suitability of the universal protocol for extraction based molecular biology techniques such as rt-PCR. The integration of multiple analytical modalities through this universal sample preparation protocol offers the ability to study tissues at a systems biology level and directly linking results to tissue morphology and cellular phenotype.
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Affiliation(s)
- Andreas Dannhorn
- Department of Digestion, Metabolism and Reproduction, Sir Alexander Fleming Building, Imperial College London, London SW7 2AZ, U.K
- Imaging and Data analytics, Clinical Pharmacology and Safety Sciences (CPSS), AstraZeneca, Cambridge, U.K
| | - Emine Kazanc
- Department of Digestion, Metabolism and Reproduction, Sir Alexander Fleming Building, Imperial College London, London SW7 2AZ, U.K
| | - Stephanie Ling
- Imaging and Data analytics, Clinical Pharmacology and Safety Sciences (CPSS), AstraZeneca, Cambridge, U.K
| | - Chelsea Nikula
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory, Teddington TW11 0LW, U.K
| | - Evdoxia Karali
- The Institute for Cancer Research (ICR), London SW7 3RP, U.K
| | - Maria Paola Serra
- Imaging and Data analytics, Clinical Pharmacology and Safety Sciences (CPSS), AstraZeneca, Cambridge, U.K
| | - Jean-Luc Vorng
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory, Teddington TW11 0LW, U.K
| | - Paolo Inglese
- Department of Digestion, Metabolism and Reproduction, Sir Alexander Fleming Building, Imperial College London, London SW7 2AZ, U.K
| | - Gareth Maglennon
- Oncology Safety, Clinical Pharmacology and Safety Sciences (CPSS), AstraZeneca, Cambridge, U.K
| | - Gregory Hamm
- Imaging and Data analytics, Clinical Pharmacology and Safety Sciences (CPSS), AstraZeneca, Cambridge, U.K
| | - John Swales
- Imaging and Data analytics, Clinical Pharmacology and Safety Sciences (CPSS), AstraZeneca, Cambridge, U.K
| | - Nicole Strittmatter
- Imaging and Data analytics, Clinical Pharmacology and Safety Sciences (CPSS), AstraZeneca, Cambridge, U.K
| | - Simon T Barry
- Bioscience, Discovery, Oncology R&D, AstraZeneca, Cambridge, United Kingdom
| | - Owen J Sansom
- Cancer Research UK Beatson Institute, Glasgow, G61 1BD, United Kingdom
| | | | - Josephine Bunch
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory, Teddington TW11 0LW, U.K
| | - Richard Ja Goodwin
- Imaging and Data analytics, Clinical Pharmacology and Safety Sciences (CPSS), AstraZeneca, Cambridge, U.K
| | - Zoltan Takats
- Department of Digestion, Metabolism and Reproduction, Sir Alexander Fleming Building, Imperial College London, London SW7 2AZ, U.K
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12
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Targeted cancer therapy using alpha-cyano-4-hydroxycinnamic acid as a novel vector molecule: A proof-of-concept study. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2020.101633] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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Pentland DR, Stevens S, Williams L, Baker M, McCall C, Makarovaite V, Balfour A, Mühlschlegel FA, Gourlay CW. Precision Antifungal Treatment Significantly Extends Voice Prosthesis Lifespan in Patients Following Total Laryngectomy. Front Microbiol 2020; 11:975. [PMID: 32508787 PMCID: PMC7251058 DOI: 10.3389/fmicb.2020.00975] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 04/22/2020] [Indexed: 11/13/2022] Open
Abstract
Indwelling silicone valves called voice prostheses (VPs) are the gold standard for speech rehabilitation in patients with laryngeal cancer following total laryngectomy. Reported VP lifespans amongst these patients are highly variable but when devices fail patients experience loss of voice and an increase risk of chest infection. Early failure of VP is a current clinical concern that is associated with regular hospital visits, reduced quality of life and associated medical cost. Poly-microbial biofilms comprised of both bacterial and fungal microorganisms readily colonize VPs and are linked to loss of device performance and its early failure in addition to providing a reservoir for potential infection. Our detailed analysis of poly-microbial biofilm composition on 159 early failing VPs from 48 total laryngectomy patients confirmed Candida albicans as the predominant fungal species and Staphylococcus aureus as the most common bacterial colonizer within our patient cohort. Using a combination of microbiological analysis, patient data and a high-throughput antifungal test assay mimicking in vivo conditions we established an evidence based precision antifungal treatment approach to VP management. Our approach has allowed us to implement a personalized VP management pathway, which increases device in situ lifespan by an average of 270%. Our study represents a significant step forward in both our understanding of the cause of VP failure and a new effective treatment pathway that offers tangible benefit to patients.
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Affiliation(s)
- Daniel R Pentland
- Kent Fungal Group, School of Biosciences, University of Kent, Kent, United Kingdom
| | - Sarah Stevens
- East Kent Hospitals, University NHS Foundation Trust, Kent, United Kingdom
| | - Leila Williams
- East Kent Hospitals, University NHS Foundation Trust, Kent, United Kingdom
| | - Mark Baker
- East Kent Hospitals, University NHS Foundation Trust, Kent, United Kingdom
| | - Carolyn McCall
- East Kent Hospitals, University NHS Foundation Trust, Kent, United Kingdom
| | | | - Alistair Balfour
- East Kent Hospitals, University NHS Foundation Trust, Kent, United Kingdom
| | | | - Campbell W Gourlay
- Kent Fungal Group, School of Biosciences, University of Kent, Kent, United Kingdom
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14
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Kato Y, Hirosawa N, Sakamoto T, Moriguchi T, Takayama J, Xuan M, Okazaki M, Suzuki Y, Hoshi A, Sakamoto Y. Characterization of 6-bromoferulic acid as a novel common-use matrix for matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34:e8636. [PMID: 31659809 DOI: 10.1002/rcm.8636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 10/08/2019] [Accepted: 10/13/2019] [Indexed: 06/10/2023]
Abstract
RATIONALE Ferulic acid (FA) is a standard matrix used for analyzing proteins. In this study, the ability of a halogenated FA to serve as an effective MALDI matrix was investigated. Various halogenated FAs were synthesized, and the characteristics and performance of each were compared with those of the standard matrices α-cyano-4-hydroxycinnamic acid (CHCA) and 2,5-dihydrobenzoic acid (DHBA). METHODS The abilities of 6-bromoferulic acid (6-BFA), ferulic acid (FA), and eight other halogenated FA derivatives to ionize eight synthetic peptides were examined. Absorption measurements, MM2 structure optimizations, and proton affinity (PA) calculations were also performed for 6-BFA and FA. The suitabilities of these compounds as matrices for matrix-assisted laser desorption/ionization (MALDI) for lipids, sugar chains, polymers, cyanocobalamin, synthetic peptides, and tryptic peptides originating from two types of serum proteins were also tested. RESULTS The 6-position of FA was found to be the best site for introducing a bromine because the generated compound allowed facile detection of cyanocobalamin and several peptides. 6-BFA exhibited good sensitivity for large peptides (3-5 kDa) and peptides containing acidic amino acids or proline. 6-BFA was also shown to be a suitable matrix for tandem mass spectrometry (MS/MS) analysis when using MALDI time-of-flight (TOF) mass spectrometry (MS) with a quadrupole ion trap (QIT) system. CONCLUSIONS The properties of 6-BFA as a MALDI matrix differed from those of DHBA and CHCA. 6-BFA appears to be a useful matrix for de novo sequencing using MALDI-QIT-TOF-MS.
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Affiliation(s)
- Yosuke Kato
- Faculty of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama, 350-0295, Japan
| | - Narumi Hirosawa
- Biomedical Research Center, Saitama Medical University, 38 Morohongo, Moroyama, Iruma-gun, Saitama, 350-0495, Japan
| | - Takeshi Sakamoto
- Faculty of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama, 350-0295, Japan
| | - Takeshi Moriguchi
- Department of Liberal Arts, Faculty of Medicine, Saitama Medical University, 38 Morohongo, Moroyama, Iruma-gun, Saitama, 350-0495, Japan
| | - Jun Takayama
- Faculty of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama, 350-0295, Japan
| | - Meiyan Xuan
- Faculty of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama, 350-0295, Japan
| | - Mari Okazaki
- Faculty of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama, 350-0295, Japan
| | - Yuko Suzuki
- Biomedical Research Center, Saitama Medical University, 38 Morohongo, Moroyama, Iruma-gun, Saitama, 350-0495, Japan
| | - Ayako Hoshi
- Faculty of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama, 350-0295, Japan
| | - Yasushi Sakamoto
- Biomedical Research Center, Saitama Medical University, 38 Morohongo, Moroyama, Iruma-gun, Saitama, 350-0495, Japan
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15
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Chen K, Baluya D, Tosun M, Li F, Maletic-Savatic M. Imaging Mass Spectrometry: A New Tool to Assess Molecular Underpinnings of Neurodegeneration. Metabolites 2019; 9:metabo9070135. [PMID: 31295847 PMCID: PMC6681116 DOI: 10.3390/metabo9070135] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 06/19/2019] [Accepted: 06/26/2019] [Indexed: 02/06/2023] Open
Abstract
Neurodegenerative diseases are prevalent and devastating. While extensive research has been done over the past decades, we are still far from comprehensively understanding what causes neurodegeneration and how we can prevent it or reverse it. Recently, systems biology approaches have led to a holistic examination of the interactions between genome, metabolome, and the environment, in order to shed new light on neurodegenerative pathogenesis. One of the new technologies that has emerged to facilitate such studies is imaging mass spectrometry (IMS). With its ability to map a wide range of small molecules with high spatial resolution, coupled with the ability to quantify them at once, without the need for a priori labeling, IMS has taken center stage in current research efforts in elucidating the role of the metabolome in driving neurodegeneration. IMS has already proven to be effective in investigating the lipidome and the proteome of various neurodegenerative diseases, such as Alzheimer's, Parkinson's, Huntington's, multiple sclerosis, and amyotrophic lateral sclerosis. Here, we review the IMS platform for capturing biological snapshots of the metabolic state to shed more light on the molecular mechanisms of the diseased brain.
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Affiliation(s)
- Kevin Chen
- Department of Biosciences, Rice University, Houston, TX 77030, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA
- Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital, Houston, TX 77030, USA
| | - Dodge Baluya
- Chemical Imaging Research Core at MD Anderson Cancer Center, University of Texas, Houston, TX 77030, USA
| | - Mehmet Tosun
- Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA
- Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital, Houston, TX 77030, USA
| | - Feng Li
- Center for Drug Discovery and Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Mirjana Maletic-Savatic
- Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA.
- Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital, Houston, TX 77030, USA.
- Department of Neuroscience and Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030, USA.
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16
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Wang Y, Garrido-Oter R, Wu J, Winkelmüller TM, Agler M, Colby T, Nobori T, Kemen E, Tsuda K. Site-specific cleavage of bacterial MucD by secreted proteases mediates antibacterial resistance in Arabidopsis. Nat Commun 2019; 10:2853. [PMID: 31253808 PMCID: PMC6599210 DOI: 10.1038/s41467-019-10793-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 06/03/2019] [Indexed: 01/10/2023] Open
Abstract
Plant innate immunity restricts growth of bacterial pathogens that threaten global food security. However, the mechanisms by which plant immunity suppresses bacterial growth remain enigmatic. Here we show that Arabidopsis thaliana secreted aspartic protease 1 and 2 (SAP1 and SAP2) cleave the evolutionarily conserved bacterial protein MucD to redundantly inhibit the growth of the bacterial pathogen Pseudomonas syringae. Antibacterial activity of SAP1 requires its protease activity in planta and in vitro. Plants overexpressing SAP1 exhibit enhanced MucD cleavage and resistance but incur no penalties in growth and reproduction, while sap1 sap2 double mutant plants exhibit compromised MucD cleavage and resistance against P. syringae. P. syringae lacking mucD shows compromised growth in planta and in vitro. Notably, growth of ΔmucD complemented with the non-cleavable MucDF106Y is not affected by SAP activity in planta and in vitro. Our findings identify the genetic factors and biochemical process underlying an antibacterial mechanism in plants. During innate immune responses, plant cells secrete proteases into apoplastic spaces where they contribute to pathogen resistance. Here Wang et al. show that the Arabidopsis SAP1 and SAP2 proteases cleave the bacterial MucD protein to inhibit growth of Pseudomonas syringae.
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Affiliation(s)
- Yiming Wang
- Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Carl-von-Linne Weg 10, 50829, Cologne, Germany
| | - Ruben Garrido-Oter
- Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Carl-von-Linne Weg 10, 50829, Cologne, Germany.,Cluster of Excellence on Plant Sciences, Heinrich Heine University Düsseldorf, 40225, Düsseldorf, Germany
| | - Jingni Wu
- Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Carl-von-Linne Weg 10, 50829, Cologne, Germany.,Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, 200032, Shanghai, China
| | - Thomas M Winkelmüller
- Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Carl-von-Linne Weg 10, 50829, Cologne, Germany
| | - Matthew Agler
- Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Carl-von-Linne Weg 10, 50829, Cologne, Germany.,Plant Microbiosis Lab, Institute of Microbiology, Friedrich-Schiller University Jena, Neugasse 23, 07743, Jena, Germany
| | - Thomas Colby
- Plant Proteomics Group, Max Planck Institute for Plant Breeding Research, Carl-von-Linne Weg 10, 50829, Cologne, Germany.,Max Planck Institute for Biology of Ageing, Joseph-Stelzmann-Strasse 9B, 50931, Cologne, Germany
| | - Tatsuya Nobori
- Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Carl-von-Linne Weg 10, 50829, Cologne, Germany
| | - Eric Kemen
- Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Carl-von-Linne Weg 10, 50829, Cologne, Germany.,Center for Plant Molecular Biology, Interfaculty Institute of Microbiology and Infection Medicine Tübingen, University of Tübingen, Auf der Morgenstelle 32, 72076, Tübingen, Germany
| | - Kenichi Tsuda
- Department of Plant Microbe Interactions, Max Planck Institute for Plant Breeding Research, Carl-von-Linne Weg 10, 50829, Cologne, Germany.
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17
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Complementarity of Matrix- and Nanostructure-Assisted Laser Desorption/Ionization Approaches. NANOMATERIALS 2019; 9:nano9020260. [PMID: 30769830 PMCID: PMC6410089 DOI: 10.3390/nano9020260] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 02/08/2019] [Accepted: 02/11/2019] [Indexed: 01/06/2023]
Abstract
In recent years, matrix-assisted laser desorption/ionization (MALDI) has become the main tool for the study of biological macromolecules, such as protein nano-machines, especially in the determination of their molecular masses, structure, and post-translational modifications. A key role in the classical process of desorption and ionization of the sample is played by a matrix, usually a low-molecular weight weak organic acid. Unfortunately, the interpretation of mass spectra in the mass range of below m/z 500 is difficult, and hence the analysis of low molecular weight compounds in a matrix-assisted system is an analytical challenge. Replacing the classical matrix with nanomaterials, e.g., silver nanoparticles, allows improvement of the selectivity and sensitivity of spectrometric measurement of biologically important small molecules. Nowadays, the nanostructure-assisted laser desorption/ionization (NALDI) approach complements the classic MALDI in the field of modern bioanalytics. In particular, the aim of this work is to review the recent advances in MALDI and NALDI approaches.
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18
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Beyer NH, Heegaard NHH. Identification of the Antigen Content of Electroimmunoprecipitates. Methods Mol Biol 2019; 2024:119-135. [PMID: 31364046 DOI: 10.1007/978-1-4939-9597-4_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Polyclonal antibodies including purified antibody fractions and animal or human antisera may react with unknown antigens or antigens other than their main specificity in reactions that are best visualized by gel electroimmunoprecipitation methods (e.g., when analyzing complex antigen mixtures). The great advantage of gel immunoprecipitation approaches is that each immunoprecipitate contains antigen in a pure form and that the precipitate is separated by position, shape, and size from other precipitates in the complex patterns of crossed immunoelectrophoresis. The identification of the antigen content of such immunoprecipitates is important but challenging because of the very stable, high-affinity complex formation leading to precipitation in the gels. Here, we present detailed step-by-step recipes for identifying the antigen content of electroimmunoprecipitates.
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Affiliation(s)
- N Helena Beyer
- Department of Autoimmunology and Biomarkers, Statens Serum Institut, Copenhagen, Denmark.
| | - Niels H H Heegaard
- Department of Autoimmunology and Biomarkers, Statens Serum Institut, Copenhagen, Denmark
- Department of Clinical Biochemistry, University of Southern Denmark, Odense, Denmark
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19
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Kim S, Lee HS. Genetic Incorporation of Biosynthesized L-dihydroxyphenylalanine (DOPA) and Its Application to Protein Conjugation. J Vis Exp 2018. [PMID: 30199031 DOI: 10.3791/58383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
L-dihydroxyphenylalanine (DOPA) is an amino acid found in the biosynthesis of catecholamines in animals and plants. Because of its particular biochemical properties, the amino acid has multiple uses in biochemical applications. This report describes a protocol for the genetic incorporation of biosynthesized DOPA and its application to protein conjugation. DOPA is biosynthesized by a tyrosine phenol-lyase (TPL) from catechol, pyruvate, and ammonia, and the amino acid is directly incorporated into proteins by the genetic incorporation method using an evolved aminoacyl-tRNA and aminoacyl-tRNA synthetase pair. This direct incorporation system efficiently incorporates DOPA with little incorporation of other natural amino acids and with better protein yield than the previous genetic incorporation system for DOPA. Protein conjugation with DOPA-containing proteins is efficient and site-specific and shows its usefulness for various applications. This protocol provides protein scientists with detailed procedures for the efficient biosynthesis of mutant proteins containing DOPA at desired sites and their conjugation for industrial and pharmaceutical applications.
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20
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Tsuchida S, Satoh M, Umemura H, Sogawa K, Takiwaki M, Ishige T, Miyabayashi Y, Iwasawa Y, Kobayashi S, Beppu M, Nishimura M, Kodera Y, Matsushita K, Nomura F. Assessment by Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry of the Effects of Preanalytical Variables on Serum Peptidome Profiles Following Long-Term Sample Storage. Proteomics Clin Appl 2018; 12:e1700047. [PMID: 29349874 PMCID: PMC5947747 DOI: 10.1002/prca.201700047] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 11/29/2017] [Indexed: 01/05/2023]
Abstract
PURPOSE Human serum and plasma are often used as clinical specimens in proteomics analyses, and peptidome profiling of human serum is a promising tool for identifying novel disease-associated biomarkers. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) is widely used for peptidomic biomarker discovery. Careful sample collection and handling are required as either can have a profound impact on serum peptidome patterns, yet the effects of preanalytical variables on serum peptidome profiles have not been completely elucidated. The present study investigated the effects of preanalytical variables, including storage temperature, duration (up to 12 months), and thawing methods, on MALDI-TOF MS-based serum peptidome patterns. EXPERIMENTAL DESIGN Aliquots of serum samples were pretreated with weak cation exchanger magnetic beads using an automated ClinProtRobot system and then analyzed by MALDI-TOF MS. RESULTS A number of significant differences in peak intensities were observed depending on sample processing variables. CONCLUSIONS AND CLINICAL RELEVANCE These peaks can be used as sample quality markers to assess the effects of long-term storage on serum peptidome profiles using MALDI-TOF MS.
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Affiliation(s)
- Sachio Tsuchida
- Division of Clinical Mass SpectrometryChiba University HospitalChibaJapan
| | - Mamoru Satoh
- Division of Clinical Mass SpectrometryChiba University HospitalChibaJapan
| | - Hiroshi Umemura
- Departments of DermatologyOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesOkayamaJapan
| | - Kazuyuki Sogawa
- Department of BiochemistrySchool of Life and Environmental ScienceAzabu UniversitySagamiharaJapan
| | - Masaki Takiwaki
- Division of Clinical Mass SpectrometryChiba University HospitalChibaJapan
| | - Takayuki Ishige
- Department of Molecular DiagnosisGraduate School of MedicineChiba UniversityChibaJapan
| | - Yui Miyabayashi
- Division of Clinical Mass SpectrometryChiba University HospitalChibaJapan
| | - Yuuya Iwasawa
- Division of Clinical Mass SpectrometryChiba University HospitalChibaJapan
| | - Sohei Kobayashi
- Department of Molecular DiagnosisGraduate School of MedicineChiba UniversityChibaJapan
| | - Minako Beppu
- Department of Molecular DiagnosisGraduate School of MedicineChiba UniversityChibaJapan
| | - Motoi Nishimura
- Department of Molecular DiagnosisGraduate School of MedicineChiba UniversityChibaJapan
| | - Yoshio Kodera
- Laboratory of Biomolecular DynamicsDepartment of physicsSchool of ScienceKitasato UniversityChibaJapan
| | - Kazuyuki Matsushita
- Department of Molecular DiagnosisGraduate School of MedicineChiba UniversityChibaJapan
| | - Fumio Nomura
- Division of Clinical Mass SpectrometryChiba University HospitalChibaJapan
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21
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Söderberg CAG, Månsson C, Bernfur K, Rutsdottir G, Härmark J, Rajan S, Al-Karadaghi S, Rasmussen M, Höjrup P, Hebert H, Emanuelsson C. Structural modelling of the DNAJB6 oligomeric chaperone shows a peptide-binding cleft lined with conserved S/T-residues at the dimer interface. Sci Rep 2018; 8:5199. [PMID: 29581438 PMCID: PMC5979959 DOI: 10.1038/s41598-018-23035-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 03/05/2018] [Indexed: 12/28/2022] Open
Abstract
The remarkably efficient suppression of amyloid fibril formation by the DNAJB6 chaperone is dependent on a set of conserved S/T-residues and an oligomeric structure, features unusual among DNAJ chaperones. We explored the structure of DNAJB6 using a combination of structural methods. Lysine-specific crosslinking mass spectrometry provided distance constraints to select a homology model of the DNAJB6 monomer, which was subsequently used in crosslink-assisted docking to generate a dimer model. A peptide-binding cleft lined with S/T-residues is formed at the monomer-monomer interface. Mixed isotope crosslinking showed that the oligomers are dynamic entities that exchange subunits. The purified protein is well folded, soluble and composed of oligomers with a varying number of subunits according to small-angle X-ray scattering (SAXS). Elongated particles (160 × 120 Å) were detected by electron microscopy and single particle reconstruction resulted in a density map of 20 Å resolution into which the DNAJB6 dimers fit. The structure of the oligomer and the S/T-rich region is of great importance for the understanding of the function of DNAJB6 and how it can bind aggregation-prone peptides and prevent amyloid diseases.
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Affiliation(s)
| | - Cecilia Månsson
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, PO Box 124, SE-221 00, Lund, Sweden
| | - Katja Bernfur
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, PO Box 124, SE-221 00, Lund, Sweden
| | - Gudrun Rutsdottir
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, PO Box 124, SE-221 00, Lund, Sweden
| | - Johan Härmark
- School of Technology and Health, KTH Royal Institute of Technology and Department of Biosciences and Nutrition, Karolinska Institute, Stockholm, Sweden
| | - Sreekanth Rajan
- School of Biological Sciences, Nanyang Technological University, Singapore, 637551, Singapore
| | - Salam Al-Karadaghi
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, PO Box 124, SE-221 00, Lund, Sweden
| | - Morten Rasmussen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Peter Höjrup
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Hans Hebert
- School of Technology and Health, KTH Royal Institute of Technology and Department of Biosciences and Nutrition, Karolinska Institute, Stockholm, Sweden
| | - Cecilia Emanuelsson
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, PO Box 124, SE-221 00, Lund, Sweden.
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22
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O'Rourke MB, Djordjevic SP, Padula MP. The quest for improved reproducibility in MALDI mass spectrometry. MASS SPECTROMETRY REVIEWS 2018; 37:217-228. [PMID: 27420733 DOI: 10.1002/mas.21515] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 05/19/2016] [Accepted: 06/16/2016] [Indexed: 05/18/2023]
Abstract
Reproducibility has been one of the biggest hurdles faced when attempting to develop quantitative protocols for MALDI mass spectrometry. The heterogeneous nature of sample recrystallization has made automated sample acquisition somewhat "hit and miss" with manual intervention needed to ensure that all sample spots have been analyzed. In this review, we explore the last 30 years of literature and anecdotal evidence that has attempted to address and improve reproducibility in MALDI MS. Though many methods have been attempted, we have discovered a significant publication history surrounding the use of nitrocellulose as a substrate to improve homogeneity of crystal formation and therefore reproducibility. We therefore propose that this is the most promising avenue of research for developing a comprehensive and universal preparation protocol for quantitative MALDI MS analysis. © 2016 Wiley Periodicals, Inc. Mass Spec Rev 37:217-228, 2018.
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Affiliation(s)
- Matthew B O'Rourke
- Proteomics Core Facility, University of Technology Sydney, Cnr Harris and Thomas St, Ultimo, New South Wales, 2007, Australia
| | - Steven P Djordjevic
- The iThree Institute, University of Technology Sydney, Cnr Harris and Thomas St, Ultimo, New South Wales, 2007, Australia
| | - Matthew P Padula
- Proteomics Core Facility, University of Technology Sydney, Cnr Harris and Thomas St, Ultimo, New South Wales, 2007, Australia
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Alalwiat A, Tang W, Gerişlioğlu S, Becker ML, Wesdemiotis C. Mass Spectrometry and Ion Mobility Characterization of Bioactive Peptide-Synthetic Polymer Conjugates. Anal Chem 2016; 89:1170-1177. [PMID: 27936608 DOI: 10.1021/acs.analchem.6b03553] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The bioconjugate BMP2-(PEO-HA)2, composed of a dendron with two monodisperse poly(ethylene oxide) (PEO) branches terminated by a hydroxyapatite binding peptide (HA), and a focal point substituted with a bone growth stimulating peptide (BMP2), has been comprehensively characterized by mass spectrometry (MS) methods, encompassing matrix-assisted laser desorption ionization (MALDI), electrospray ionization (ESI), tandem mass spectrometry (MS2), and ion mobility mass spectrometry (IM-MS). MS2 experiments using different ion activation techniques validated the sequences of the synthetic, bioactive peptides HA and BMP2, which contained highly basic amino acid residues either at the N-terminus (BMP2) or C-terminus (HA). Application of MALDI-MS, ESI-MS, and IM-MS to the polymer-peptide biomaterial confirmed its composition. Collision cross-section measurements and molecular modeling indicated that BMP2-(PEO-HA)2 exists in several folded and extended conformations, depending on the degree of protonation. Protonation of all basic sites of the hybrid material nearly doubles its conformational space and accessible surface area.
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Affiliation(s)
- Ahlam Alalwiat
- Departments of †Chemistry and ‡Polymer Science, The University of Akron , Akron, Ohio 44325, United States
| | - Wen Tang
- Departments of †Chemistry and ‡Polymer Science, The University of Akron , Akron, Ohio 44325, United States
| | - Selim Gerişlioğlu
- Departments of †Chemistry and ‡Polymer Science, The University of Akron , Akron, Ohio 44325, United States
| | - Matthew L Becker
- Departments of †Chemistry and ‡Polymer Science, The University of Akron , Akron, Ohio 44325, United States
| | - Chrys Wesdemiotis
- Departments of †Chemistry and ‡Polymer Science, The University of Akron , Akron, Ohio 44325, United States
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24
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Bugovsky S, Winkler W, Balika W, Koranda M, Allmaier G. Polymer-based metal nano-coated disposable target for matrix-assisted and matrix-free laser desorption/ionization mass spectrometry. Methods 2016; 104:182-93. [DOI: 10.1016/j.ymeth.2016.03.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 03/24/2016] [Accepted: 03/28/2016] [Indexed: 11/29/2022] Open
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25
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Sinclair I, Stearns R, Pringle S, Wingfield J, Datwani S, Hall E, Ghislain L, Majlof L, Bachman M. Novel Acoustic Loading of a Mass Spectrometer. ACTA ACUST UNITED AC 2016; 21:19-26. [DOI: 10.1177/2211068215619124] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Indexed: 11/16/2022]
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26
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Bowrey HE, Anderson DM, Pallitto P, Gutierrez DB, Fan J, Crouch RK, Schey KL, Ablonczy Z. Imaging mass spectrometry of the visual system: Advancing the molecular understanding of retina degenerations. Proteomics Clin Appl 2016; 10:391-402. [PMID: 26586164 DOI: 10.1002/prca.201500103] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2015] [Revised: 08/15/2015] [Accepted: 11/11/2015] [Indexed: 11/08/2022]
Abstract
Visual sensation is fundamental for quality of life, and loss of vision to retinal degeneration is a debilitating condition. The eye is the only part of the central nervous system that can be noninvasively observed with optical imaging. In the clinics, various spectroscopic methods provide high spatial resolution images of the fundus and the developing degenerative lesions. However, the currently utilized tools are not specific enough to establish the molecular underpinnings of retinal diseases. In contrast, mass spectrometric imaging (MSI) is a powerful tool to identify molecularly specific disease indicators and classification markers. This technique is particularly well suited to the eye, where molecular information can be correlated with clinical data collected via noninvasive diagnostic imaging modalities. Recent studies during the last few recent years have uncovered a plethora of new spatially defined molecular information on several vision-threatening diseases, including age-related macular degeneration, Stargardt disease, glaucoma, cataract, as well as lipid disorders. Even though MS inside the eye cannot be performed noninvasively, by linking diagnostic and molecular information, these studies are the first step toward the development of smart ophthalmic diagnostic and surgical tools. Here, we provide an overview of current approaches applying MSI technology to ocular pathology.
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Affiliation(s)
- Hannah E Bowrey
- Brain Health Institute, Rutgers University, New Brunswick, NJ, USA
| | - David M Anderson
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Patrick Pallitto
- Robert Wood Johnson Medical School, Rutgers University, New Brunswick, NJ, USA
| | - Danielle B Gutierrez
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Jie Fan
- Department of Ophthalmology, Medical University of South Carolina, Charleston, SC, USA
| | - Rosalie K Crouch
- Department of Ophthalmology, Medical University of South Carolina, Charleston, SC, USA
| | - Kevin L Schey
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Zsolt Ablonczy
- Department of Ophthalmology, Medical University of South Carolina, Charleston, SC, USA
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27
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Wang S, Zhang G, Zhang Y, Song Q, Chen Z, Wang J, Guo J, Niu N, Wang J, Ma S. Comparative studies of mitochondrial proteomics reveal an intimate protein network of male sterility in wheat (Triticum aestivum L.). JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:6191-203. [PMID: 26136264 PMCID: PMC4588876 DOI: 10.1093/jxb/erv322] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Plant male sterility has often been associated with mitochondrial dysfunction; however, the mechanism in wheat (Triticum aestivum L.) has not been elucidated. This study set out to probe the mechanism of physiological male sterility (PHYMS) induced by the chemical hybridizing agent (CHA)-SQ-1, and cytoplasmic male sterility (CMS) of wheat at the proteomic level. A total of 71 differentially expressed mitochondrial proteins were found to be involved in pollen abortion and further identified by MALDI-TOF/TOF MS (matrix-assisted laser desorption/ionization-time of fight/time of flight mass spectrometry). These proteins were implicated in different cellular responses and metabolic processes, with obvious functional tendencies toward the tricarboxylic acid cycle, the mitochondrial electron transport chain, protein synthesis and degradation, oxidation stress, the cell division cycle, and epigenetics. Interactions between identified proteins were demonstrated by bioinformatics analysis, enabling a more complete insight into biological pathways involved in anther abortion and pollen defects. Accordingly, a mitochondria-mediated male sterility protein network in wheat is proposed; this network was further confirmed by physiological data, RT-PCR (real-time PCR), and TUNEL (terminal deoxynucleotidyl transferase-mediated dUTP nick end labelling) assay. The results provide intriguing insights into the metabolic pathway of anther abortion induced by CHA-SQ-1 and also give useful clues to identify the crucial proteins of PHYMS and CMS in wheat.
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Affiliation(s)
- Shuping Wang
- College of Agronomy, Northwest A&F University, National Yangling Agricultural Biotechnology & Breeding Center, Yangling Branch of State Wheat Improvement Centre, Wheat Breeding Engineering Research Center, Ministry of Education, Key Laboratory of Crop Heterosis of Shaanxi Province, Yangling, Shaanxi 712100, P. R. China
| | - Gaisheng Zhang
- College of Agronomy, Northwest A&F University, National Yangling Agricultural Biotechnology & Breeding Center, Yangling Branch of State Wheat Improvement Centre, Wheat Breeding Engineering Research Center, Ministry of Education, Key Laboratory of Crop Heterosis of Shaanxi Province, Yangling, Shaanxi 712100, P. R. China
| | - Yingxin Zhang
- Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, P. R. China
| | - Qilu Song
- College of Agronomy, Northwest A&F University, National Yangling Agricultural Biotechnology & Breeding Center, Yangling Branch of State Wheat Improvement Centre, Wheat Breeding Engineering Research Center, Ministry of Education, Key Laboratory of Crop Heterosis of Shaanxi Province, Yangling, Shaanxi 712100, P. R. China
| | - Zheng Chen
- College of Agronomy, Northwest A&F University, National Yangling Agricultural Biotechnology & Breeding Center, Yangling Branch of State Wheat Improvement Centre, Wheat Breeding Engineering Research Center, Ministry of Education, Key Laboratory of Crop Heterosis of Shaanxi Province, Yangling, Shaanxi 712100, P. R. China
| | - Junsheng Wang
- College of Agronomy, Northwest A&F University, National Yangling Agricultural Biotechnology & Breeding Center, Yangling Branch of State Wheat Improvement Centre, Wheat Breeding Engineering Research Center, Ministry of Education, Key Laboratory of Crop Heterosis of Shaanxi Province, Yangling, Shaanxi 712100, P. R. China
| | - Jialin Guo
- College of Agronomy, Northwest A&F University, National Yangling Agricultural Biotechnology & Breeding Center, Yangling Branch of State Wheat Improvement Centre, Wheat Breeding Engineering Research Center, Ministry of Education, Key Laboratory of Crop Heterosis of Shaanxi Province, Yangling, Shaanxi 712100, P. R. China
| | - Na Niu
- College of Agronomy, Northwest A&F University, National Yangling Agricultural Biotechnology & Breeding Center, Yangling Branch of State Wheat Improvement Centre, Wheat Breeding Engineering Research Center, Ministry of Education, Key Laboratory of Crop Heterosis of Shaanxi Province, Yangling, Shaanxi 712100, P. R. China
| | - Junwei Wang
- College of Agronomy, Northwest A&F University, National Yangling Agricultural Biotechnology & Breeding Center, Yangling Branch of State Wheat Improvement Centre, Wheat Breeding Engineering Research Center, Ministry of Education, Key Laboratory of Crop Heterosis of Shaanxi Province, Yangling, Shaanxi 712100, P. R. China
| | - Shoucai Ma
- College of Agronomy, Northwest A&F University, National Yangling Agricultural Biotechnology & Breeding Center, Yangling Branch of State Wheat Improvement Centre, Wheat Breeding Engineering Research Center, Ministry of Education, Key Laboratory of Crop Heterosis of Shaanxi Province, Yangling, Shaanxi 712100, P. R. China
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28
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Heiler S, Mu W, Zöller M, Thuma F. The importance of claudin-7 palmitoylation on membrane subdomain localization and metastasis-promoting activities. Cell Commun Signal 2015; 13:29. [PMID: 26054340 PMCID: PMC4459675 DOI: 10.1186/s12964-015-0105-y] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 04/21/2015] [Indexed: 12/14/2022] Open
Abstract
Background Claudin-7 (cld7), a tight junction (TJ) component, is also found basolaterally and in the cytoplasm. Basolaterally located cld7 is enriched in glycolipid-enriched membrane domains (GEM), where it associates with EpCAM (EpC). The conditions driving cld7 out of TJ into GEM, which is associated with a striking change in function, were not defined. Thus, we asked whether cld7 serines or palmitoylation affect cld7 location and protein, particularly EpCAM, associations. Results HEK cells were transfected with EpCAM and wild type cld7 or cld7, where serine phopsphorylation or the palmitoylation sites (AA184, AA186) (cld7mPalm) were mutated. Exchange of individual serine phosphorylation sites did not significantly affect the GEM localization and the EpCAM association. Instead, cld7mPalm was poorly recruited into GEM. This has consequences on migration and invasiveness as palmitoylated cld7 facilitates integrin and EpCAM recruitment, associates with cytoskeletal linker proteins and cooperates with MMP14, CD147 and TACE, which support motility, matrix degradation and EpCAM cleavage. On the other hand, only cld7mPalm associates with TJ proteins. Conclusion Cld7 palmitoylation prohibits TJ integration and fosters GEM recruitment. Via associated molecules, palmitoylated cld7 supports motility and invasion. Electronic supplementary material The online version of this article (doi:10.1186/s12964-015-0105-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Sarah Heiler
- Department of Tumor Cell Biology, University Hospital of Surgery, Im Neuenheimer Feld 365, 69120, Heidelberg, Germany.
| | - Wei Mu
- Department of Tumor Cell Biology, University Hospital of Surgery, Im Neuenheimer Feld 365, 69120, Heidelberg, Germany.
| | - Margot Zöller
- Department of Tumor Cell Biology, University Hospital of Surgery, Im Neuenheimer Feld 365, 69120, Heidelberg, Germany.
| | - Florian Thuma
- Department of Tumor Cell Biology, University Hospital of Surgery, Im Neuenheimer Feld 365, 69120, Heidelberg, Germany.
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29
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Yao C, Zhuang H, Cheng W, Lin Y, Du P, Yang B, Huang X, Chen S, Hu Q, Hua ZC. FADD phosphorylation impaired islet morphology and function. J Cell Physiol 2015; 230:1448-56. [PMID: 25641109 DOI: 10.1002/jcp.24885] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Accepted: 11/26/2014] [Indexed: 11/06/2022]
Abstract
Previous studies have indicated that Fas-FasL pathway and its downstream caspase-8 can regulate islet mass and insulin secretion. As a classical adaptor in Fas-FasL signaling, Fas-associated death domain-containing protein (FADD) takes part in many non-apoptosis processes regulated by its phosphorylation. However, its role in islets has not been evaluated to date. Here, through comparative proteomics and bioinformatic analysis on FADD phosphorylated (FADD-D) and wild-type (WT) MEFs, we found three proteins involved in islet differentiation and function were dysregulated due to FADD phosphorylation. The mouse model of FADD-D, which mimics constitutive phosphorylated FADD expression in mice, was further analyzed to address this issue. We confirmed the proteomic results by immunohistological analyses on pancreatic islets. In addition, we found that FADD-D mice displayed decreased islet area, and the glucose stimulated insulin secretion (GSIS) of FADD-D islets was impaired. These data suggest a novel role of FADD in islet development and insulin secretion.
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Affiliation(s)
- Chun Yao
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Stomatology and Affiliated Stomatological Hospital, Nanjing University, Nanjing, 210093, P. R. China
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30
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Salem S, Jankowski V, Asare Y, Liehn E, Welker P, Raya-Bermudez A, Pineda-Martos C, Rodriguez M, Muñoz-Castañeda JR, Bruck H, Marx N, Machado FB, Staudt M, Heinze G, Zidek W, Jankowski J. Identification of the Vasoconstriction-Inhibiting Factor (VIF), a Potent Endogenous Cofactor of Angiotensin II Acting on the Angiotensin II Type 2 Receptor. Circulation 2015; 131:1426-34. [PMID: 25810338 DOI: 10.1161/circulationaha.114.013168] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 02/26/2015] [Indexed: 01/01/2023]
Abstract
BACKGROUND The renin-angiotensin system and especially the angiotensin peptides play a central role in blood pressure regulation. Here, we hypothesize that an as-yet unknown peptide is involved in the action of angiotensin II modulating the vasoregulatory effects as a cofactor. METHODS AND RESULTS The peptide with vasodilatory properties was isolated from adrenal glands chromatographically. The effects of this peptide were evaluated in vitro and in vivo, and the receptor affinity was analyzed. The plasma concentration in humans was quantified in patients with chronic kidney disease, patients with heart failure, and healthy control subjects. The amino acid sequence of the peptide from bovine adrenal glands was HSSYEDELSEVL EKPNDQAE PKEVTEEVSSKDAAE, which is a degradation product of chromogranin A. The sequence of the peptide isolated from human plasma was HSGFEDELSEVLENQSSQAELKEAVEEPSSKDVME. Both peptides diminished significantly the vasoconstrictive effect of angiotensin II in vitro. Therefore, we named the peptide vasoconstriction-inhibiting factor (VIF). The vasoregulatory effects of VIF are mediated by the angiotensin II type 2 receptor. VIF impairs angiotensin II-induced phosphorylation of the p38 mitogen-activated protein kinase pathway but not of extracellular-regulated kinase 1/2. The vasodilatory effects were confirmed in vivo. The plasma concentration was significantly increased in renal patients and patients with heart failure. CONCLUSIONS VIF is a vasoregulatory peptide that modulates the vasoconstrictive effects of angiotensin II by acting on the angiotensin II type 2 receptor. It is likely that the increase in VIF may serve as a counterregulatory effect to defend against hypertension. The identification of this target may help us to understand the pathophysiology of renal and heart failure and may form a basis for the development of new strategies for the prevention and treatment of cardiovascular disease.
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Affiliation(s)
- Silvia Salem
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Vera Jankowski
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Yaw Asare
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Elisa Liehn
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Pia Welker
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Ana Raya-Bermudez
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Carmen Pineda-Martos
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Mariano Rodriguez
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Juan Rafael Muñoz-Castañeda
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Heike Bruck
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Nikolaus Marx
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Fernanda B Machado
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Mareike Staudt
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Georg Heinze
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Walter Zidek
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.)
| | - Joachim Jankowski
- From Charité-Universitätsmedizin Berlin, Medizinische Klinik IV, Berlin, Germany (S.S., W.Z.); Universitätsklinikum RWTH Aachen, Institute of Molecular Cardiovascular Research, Aachen, Germany (S.S., V.J., Y.A., E.L., M.S., J.J.); Charité-Universitätsmedizin Berlin, Institute of Vegetative Physiology, Berlin, Germany (P.W., F.B.M.); Nefrology Service, IMIBIC, Reina Sofia University Hospital, University of Cordoba, Spain (A.R.-B., C.P.-M., M.R., J.R.M.-C.); University Hospital Essen, Department of Nephrology, University of Duisburg-Essen, Essen, Germany (H.B.); University Hospital Aachen, RWTH Aachen, Department of Internal Medicine I-Cardiology, Aachen, Germany (N.M.); and Medical University of Vienna, Center for Medical Statistics, Informatics and Intelligent Systems, Section for Clinical Biometrics, Vienna, Austria (G.H.).
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Dubayle J, Vialle S, Schneider D, Pontvianne J, Mantel N, Adam O, Guy B, Talaga P. Site-specific characterization of envelope protein N-glycosylation on Sanofi Pasteur's tetravalent CYD dengue vaccine. Vaccine 2015; 33:1360-8. [PMID: 25660649 DOI: 10.1016/j.vaccine.2015.01.047] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 01/09/2015] [Accepted: 01/11/2015] [Indexed: 01/16/2023]
Abstract
Recently, several virus studies have shown that protein glycosylation play a fundamental role in the virus-host cell interaction. Glycosylation characterization of the envelope proteins in both insect and mammalian cell-derived dengue virus (DENV) has established that two potential glycosylation residues, the asparagine 67 and 153 can potentially be glycosylated. Moreover, it appears that the glycosylation of these two residues can influence dramatically the virus production and the infection spreading in either mosquito or mammalian cells. The Sanofi Pasteur tetravalent dengue vaccine (CYD) consists of four chimeric viruses produced in mammalian vero cells. As DENV, the CYDs are able to infect human monocyte-derived dendritic cells in vitro via C-type lectins cell-surface molecules. Despite the importance of this interaction, the specific glycosylation pattern of the DENV has not been clearly documented so far. In this paper, we investigated the structure of the N-linked glycans in the four CYD serotypes. Using MALDI-TOF analysis, the N-linked glycans of CYDs were found to be a mix of high-mannose, hybrid and complex glycans. Site-specific N-glycosylation analysis of CYDs using nanoLC-ESI-MS/MS demonstrates that both asparagine residues 67 and 153 are glycosylated. Predominant glycoforms at asparagine 67 are high mannose-type structures while mainly complex- and hybrid-type structures are detected at asparagine 153. In vitro studies have shown that the immunological consequences of infection by the CYD dengue viruses 1-4 versus the wild type parents are comparable in human monocyte-derived dendritic cells. Our E-protein glycan characterizations of CYD are consistent with those observations from the wild type parents and thus support in vitro studies. In addition, these data provide new insights for the role of glycans in the dengue virus-host cell interactions.
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Affiliation(s)
- Jean Dubayle
- Research and Development Department, Sanofi Pasteur, Campus Mérieux, 1541 Avenue Marcel Mérieux, 69280 Marcy L'Etoile, France.
| | - Sandrine Vialle
- Research and Development Department, Sanofi Pasteur, Campus Mérieux, 1541 Avenue Marcel Mérieux, 69280 Marcy L'Etoile, France
| | - Diane Schneider
- Research and Development Department, Sanofi Pasteur, Campus Mérieux, 1541 Avenue Marcel Mérieux, 69280 Marcy L'Etoile, France
| | - Jérémy Pontvianne
- Research and Development Department, Sanofi Pasteur, Campus Mérieux, 1541 Avenue Marcel Mérieux, 69280 Marcy L'Etoile, France
| | - Nathalie Mantel
- Research and Development Department, Sanofi Pasteur, Campus Mérieux, 1541 Avenue Marcel Mérieux, 69280 Marcy L'Etoile, France
| | - Olivier Adam
- Research and Development Department, Sanofi Pasteur, Campus Mérieux, 1541 Avenue Marcel Mérieux, 69280 Marcy L'Etoile, France
| | - Bruno Guy
- Research and Development Department, Sanofi Pasteur, Campus Mérieux, 1541 Avenue Marcel Mérieux, 69280 Marcy L'Etoile, France
| | - Philippe Talaga
- Research and Development Department, Sanofi Pasteur, Campus Mérieux, 1541 Avenue Marcel Mérieux, 69280 Marcy L'Etoile, France
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Patzak A, Carlström M, Sendeski MM, Lai EY, Liu ZZ, Sällström J, Flöge J, Heintz B, Jankowski J, Jankowski V. Diadenosine pentaphosphate modulates glomerular arteriolar tone and glomerular filtration rate. Acta Physiol (Oxf) 2015; 213:285-93. [PMID: 25394939 DOI: 10.1111/apha.12425] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Revised: 07/28/2014] [Accepted: 11/09/2014] [Indexed: 12/22/2022]
Abstract
INTRODUCTION Mechanisms and participating substances involved in the reduction of glomerular filtration (GFR) in contrast-induced acute kidney injury (CI-AKI) are still matter of debate. We hypothesized that diadenosine polyphosphates are released by the action of contrast media on tubular cells and may act on glomerular arterioles and reduce GFR. METHODS Freshly isolated rat tubules were treated with the contrast medium iodixanol (47 mg iodine per mL) at 37 °C for 20 min. The content of Apn A (n = 3-6) in the supernatant of treated tubules and in the plasma of healthy persons and patients with AKI was analysed using reversed-phase chromatography, affinity chromatography and mass spectrometry. GFR was obtained in conscious mice by inulin clearance. Concentration response curves for Apn A (n = 3-6, 10(-12) -10(-5) mol L(-1) ) were measured in isolated perfused glomerular arterioles. RESULTS Iodixanol treatment of tubules significantly increased the concentration of Apn A (n = 3-5) in the supernatant. Ap6 A was below the detection limit. AKI patient shows higher concentrations of Apn A compared to healthy. Application of Ap5 A significantly reduced the GFR in conscious mice. Ap5 A reduced afferent arteriolar diameters, but did not influence efferent arterioles. The constrictor effect on afferent arterioles was strong immediately after application, but weakened with time. Then, non-selective P2 inhibitor suramin blocked the Ap5 A-induced constriction. CONCLUSION The data suggest that Ap5 A plays a role in the pathophysiology of CI-AKI. We show a contrast media-induced release of Ap5 A from tubules, which might increase afferent arteriolar resistance and reduce the GFR.
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Affiliation(s)
- A. Patzak
- Institute of Vegetative Physiology; Charité-Universitätsmedizin Berlin; Berlin Germany
| | - M. Carlström
- Department of Physiology and Pharmacology; Karolinska Institutet; Stockholm Sweden
| | - M. M. Sendeski
- Institute of Vegetative Physiology; Charité-Universitätsmedizin Berlin; Berlin Germany
| | - E. Y. Lai
- Department of Physiology; Zhejiang University School of Medicine; Hangzhou China
| | - Z. Z. Liu
- Institute of Vegetative Physiology; Charité-Universitätsmedizin Berlin; Berlin Germany
| | - J. Sällström
- Department of Physiology and Pharmacology; Karolinska Institutet; Stockholm Sweden
| | - J. Flöge
- Division of Nephrology and Clinical Immunology; RWTH University of Aachen; Aachen Germany
| | - B. Heintz
- Division of Nephrology and Clinical Immunology; RWTH University of Aachen; Aachen Germany
| | - J. Jankowski
- Institute of Molecular Cardiovascular Research; RWTH University of Aachen; Aachen Germany
| | - V. Jankowski
- Institute of Molecular Cardiovascular Research; RWTH University of Aachen; Aachen Germany
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33
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Alhmoud HZ, Guinan TM, Elnathan R, Kobus H, Voelcker NH. Surface-assisted laser desorption/ionization mass spectrometry using ordered silicon nanopillar arrays. Analyst 2014; 139:5999-6009. [DOI: 10.1039/c4an01391c] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Liang Q, Macher T, Xu Y, Bao Y, Cassady CJ. MALDI MS In-Source Decay of Glycans Using a Glutathione-Capped Iron Oxide Nanoparticle Matrix. Anal Chem 2014; 86:8496-503. [DOI: 10.1021/ac502422a] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Qiaoli Liang
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Thomas Macher
- Department
of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Yaolin Xu
- Department
of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Yuping Bao
- Department
of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Carolyn J. Cassady
- Department
of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
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Ramírez-Cordero B, Toledano Y, Cano-Sánchez P, Hernández-López R, Flores-Solis D, Saucedo-Yáñez AL, Chávez-Uribe I, Brieba LG, del Río-Portilla F. Cytotoxicity of recombinant tamapin and related toxin-like peptides on model cell lines. Chem Res Toxicol 2014; 27:960-7. [PMID: 24821061 DOI: 10.1021/tx4004193] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The scorpion toxin tamapin displays the most potent and selective blockage against KCa2.2 channels known to date. In this work, we report the biosynthesis, three-dimensional structure, and cytotoxicity on cancer cell lines (Jurkat E6-1 and human mammary breast cancer MDA-MB-231) of recombinant tamapin and five related peptides bearing mutations on residues (R6A,R7A, R13A, R6A-R7A, and GS-tamapin) that were previously suggested to be important for tamapin's activity. The indicated cell lines were used as they constitutively express KCa2.2 channels. The studied toxin-like peptides displayed lethal responses on Jurkat T cells and breast cancer cells; their effect is dose- and time-dependent with IC50 values in the nanomolar range. The order of potency is r-tamapin>GS-tamapin>R6A>R13A>R6A-R7A>R7A for Jurkat T cells and r-tamapin>R7A for MDA-MB-231 breast cancer cells. Our structural determination by NMR demonstrated that r-tamapin preserves the folding of the αKTx5 subfamily and that neither single nor double alanine mutations affect the three-dimensional structure of the wild-type peptide. In contrast, our activity assays show that changes in cytotoxicity are related to the chemical nature of certain residues. Our results suggest that the toxic activity of r-tamapin on Jurkat and breast cancer cells could be mediated by the interaction of charged residues in tamapin with KCa2.2 channels via the apoptotic cell death pathway.
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Affiliation(s)
- Belén Ramírez-Cordero
- Instituto de Química, Universidad Nacional Autónoma de México , Ciudad Universitaria, Circuito Exterior s/n, México, D.F. 04510, México
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36
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In vitro gastrointestinal digestion of bovine αS1- and αS2-casein variants gives rise to different IgE-binding epitopes. Int Dairy J 2014. [DOI: 10.1016/j.idairyj.2013.06.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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37
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Felix K, Hauck O, Fritz S, Hinz U, Schnölzer M, Kempf T, Warnken U, Michel A, Pawlita M, Werner J. Serum protein signatures differentiating autoimmune pancreatitis versus pancreatic cancer. PLoS One 2013; 8:e82755. [PMID: 24349355 PMCID: PMC3857261 DOI: 10.1371/journal.pone.0082755] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Accepted: 11/04/2013] [Indexed: 12/24/2022] Open
Abstract
Autoimmune pancreatitis (AIP) is defined by characteristic lymphoplasmacytic infiltrate, ductal strictures and a pancreatic enlargement or mass that can mimic pancreatic cancer (PaCa). The distinction between this benign disease and pancreatic cancer can be challenging. However, an accurate diagnosis may pre-empt the misdiagnosis of cancer, allowing the appropriate medical treatment of AIP and, consequently, decreasing the number of unnecessary pancreatic resections. Mass spectrometry (MS) and two-dimensional differential gel electrophoresis (2D-DIGE) have been applied to analyse serum protein alterations associated with AIP and PaCa, and to identify protein signatures indicative of the diseases. Patients' sera were immunodepleted from the 20 most prominent serum proteins prior to further 2D-DIGE and image analysis. The identity of the most-discriminatory proteins detected, was performed by MS and ELISAs were applied to confirm their expression. Serum profiling data analysis with 2D-DIGE revealed 39 protein peaks able to discriminate between AIP and PaCa. Proteins were purified and further analysed by MALDI-TOF-MS. Peptide mass fingerprinting led to identification of eleven proteins. Among them apolipoprotein A-I, apolipoprotein A-II, transthyretin, and tetranectin were identified and found as 3.0-, 3.5-, 2-, and 1.6-fold decreased in PaCa sera, respectively, whereas haptoglobin and apolipoprotein E were found to be 3.8- and 1.6-fold elevated in PaCa sera. With the exception of haptoglobin the ELISA results of the identified proteins confirmed the 2D-DIGE image analysis characteristics. Integration of the identified serum proteins as AIP markers may have considerable potential to provide additional information for the diagnosis of AIP to choose the appropriate treatment.
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Affiliation(s)
- Klaus Felix
- Department of General Surgery, University of Heidelberg, INF 110, Heidelberg, Germany
- * E-mail: (KF)
| | - Oliver Hauck
- Department of General Surgery, University of Heidelberg, INF 110, Heidelberg, Germany
| | - Stefan Fritz
- Department of General Surgery, University of Heidelberg, INF 110, Heidelberg, Germany
| | - Ulf Hinz
- Department of General Surgery, University of Heidelberg, INF 110, Heidelberg, Germany
| | - Martina Schnölzer
- Functional Proteome Analysis, German Cancer Research Center (DKFZ), INF 580, Heidelberg, Germany
| | - Tore Kempf
- Functional Proteome Analysis, German Cancer Research Center (DKFZ), INF 580, Heidelberg, Germany
| | - Uwe Warnken
- Functional Proteome Analysis, German Cancer Research Center (DKFZ), INF 580, Heidelberg, Germany
| | - Angelika Michel
- Infection and Cancer Program, German Cancer Research Center (DKFZ), INF 260, Heidelberg, Germany
| | - Michael Pawlita
- Infection and Cancer Program, German Cancer Research Center (DKFZ), INF 260, Heidelberg, Germany
| | - Jens Werner
- Department of General Surgery, University of Heidelberg, INF 110, Heidelberg, Germany
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Gu C, Shannon DA, Colby T, Wang Z, Shabab M, Kumari S, Villamor JG, McLaughlin CJ, Weerapana E, Kaiser M, Cravatt BF, van der Hoorn RAL. Chemical proteomics with sulfonyl fluoride probes reveals selective labeling of functional tyrosines in glutathione transferases. ACTA ACUST UNITED AC 2013; 20:541-8. [PMID: 23601643 DOI: 10.1016/j.chembiol.2013.01.016] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Revised: 01/07/2013] [Accepted: 01/12/2013] [Indexed: 01/16/2023]
Abstract
Chemical probes have great potential for identifying functional residues in proteins in crude proteomes. Here we studied labeling sites of chemical probes based on sulfonyl fluorides (SFs) on plant and animal proteomes. Besides serine proteases and many other proteins, SF-based probes label Tyr residues in glutathione transferases (GSTs). The labeled GSTs represent four different GST classes that share less than 30% sequence identity. The targeted Tyr residues are located at similar positions in the promiscuous substrate binding site and are essential for GST function. The high selectivity of SF-based probes for functional Tyr residues in GSTs illustrates how these probes can be used for functional studies of GSTs and other proteins in crude proteomes.
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Affiliation(s)
- Christian Gu
- The Plant Chemetics Laboratory, Max Planck Institute for Plant Breeding Research, Carl-von-Linne Weg 10, 50829 Cologne, Germany
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Fischer M, Schreiber L, Colby T, Kuckenberg M, Tacke E, Hofferbert HR, Schmidt J, Gebhardt C. Novel candidate genes influencing natural variation in potato tuber cold sweetening identified by comparative proteomics and association mapping. BMC PLANT BIOLOGY 2013; 13:113. [PMID: 23919263 PMCID: PMC3750364 DOI: 10.1186/1471-2229-13-113] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Accepted: 08/02/2013] [Indexed: 05/02/2023]
Abstract
BACKGROUND Higher plants evolved various strategies to adapt to chilling conditions. Among other transcriptional and metabolic responses to cold temperatures plants accumulate a range of solutes including sugars. The accumulation of the reducing sugars glucose and fructose in mature potato tubers during exposure to cold temperatures is referred to as cold induced sweetening (CIS). The molecular basis of CIS in potato tubers is of interest not only in basic research on plant adaptation to environmental stress but also in applied research, since high amounts of reducing sugars affect negatively the quality of processed food products such as potato chips. CIS-tolerance varies considerably among potato cultivars. Our objective was to identify by an unbiased approach genes and cellular processes influencing natural variation of tuber sugar content before and during cold storage in potato cultivars used in breeding programs. We compared by two-dimensional polyacrylamide gel electrophoresis the tuber proteomes of cultivars highly diverse for CIS. DNA polymorphisms in genomic sequences encoding differentially expressed proteins were tested for association with tuber starch content, starch yield and processing quality. RESULTS Pronounced natural variation of CIS was detected in tubers of a population of 40 tetraploid potato cultivars. Significant differences in protein expression were detected between CIS-tolerant and CIS-sensitive cultivars before the onset as well as during cold storage. Identifiable differential proteins corresponded to protease inhibitors, patatins, heat shock proteins, lipoxygenase, phospholipase A1 and leucine aminopeptidase (Lap). Association mapping based on single nucleotide polymorphisms supported a role of Lap in the natural variation of the quantitative traits tuber starch and sugar content. CONCLUSIONS The combination of comparative proteomics and association genetics led to the discovery of novel candidate genes for influencing the natural variation of quantitative traits in potato tubers. One such gene was a leucine aminopeptidase not considered so far to play a role in starch sugar interconversion. Novel SNP's diagnostic for increased tuber starch content, starch yield and chip quality were identified, which are useful for selecting improved potato processing cultivars.
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Affiliation(s)
- Matthias Fischer
- Department of Plant Breeding and Genetics, Max-Planck-Institute for Plant Breeding Research, Cologne, Germany
| | - Lena Schreiber
- Department of Plant Breeding and Genetics, Max-Planck-Institute for Plant Breeding Research, Cologne, Germany
| | - Thomas Colby
- Max-Planck-Institute for Plant Breeding Research, Mass Spectrometry Group, Cologne, Germany
| | - Markus Kuckenberg
- Department of Plant Breeding and Genetics, Max-Planck-Institute for Plant Breeding Research, Cologne, Germany
| | - Eckhard Tacke
- BIOPLANT, Biotechnologisches Forschungslabor GmbH, Cologne, Germany
| | | | - Jürgen Schmidt
- Max-Planck-Institute for Plant Breeding Research, Mass Spectrometry Group, Cologne, Germany
| | - Christiane Gebhardt
- Department of Plant Breeding and Genetics, Max-Planck-Institute for Plant Breeding Research, Cologne, Germany
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40
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Fischer M, Schreiber L, Colby T, Kuckenberg M, Tacke E, Hofferbert HR, Schmidt J, Gebhardt C. Novel candidate genes influencing natural variation in potato tuber cold sweetening identified by comparative proteomics and association mapping. BMC PLANT BIOLOGY 2013; 13:113. [PMID: 23919263 DOI: 10.1186/1471-222913-113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Accepted: 08/02/2013] [Indexed: 05/18/2023]
Abstract
BACKGROUND Higher plants evolved various strategies to adapt to chilling conditions. Among other transcriptional and metabolic responses to cold temperatures plants accumulate a range of solutes including sugars. The accumulation of the reducing sugars glucose and fructose in mature potato tubers during exposure to cold temperatures is referred to as cold induced sweetening (CIS). The molecular basis of CIS in potato tubers is of interest not only in basic research on plant adaptation to environmental stress but also in applied research, since high amounts of reducing sugars affect negatively the quality of processed food products such as potato chips. CIS-tolerance varies considerably among potato cultivars. Our objective was to identify by an unbiased approach genes and cellular processes influencing natural variation of tuber sugar content before and during cold storage in potato cultivars used in breeding programs. We compared by two-dimensional polyacrylamide gel electrophoresis the tuber proteomes of cultivars highly diverse for CIS. DNA polymorphisms in genomic sequences encoding differentially expressed proteins were tested for association with tuber starch content, starch yield and processing quality. RESULTS Pronounced natural variation of CIS was detected in tubers of a population of 40 tetraploid potato cultivars. Significant differences in protein expression were detected between CIS-tolerant and CIS-sensitive cultivars before the onset as well as during cold storage. Identifiable differential proteins corresponded to protease inhibitors, patatins, heat shock proteins, lipoxygenase, phospholipase A1 and leucine aminopeptidase (Lap). Association mapping based on single nucleotide polymorphisms supported a role of Lap in the natural variation of the quantitative traits tuber starch and sugar content. CONCLUSIONS The combination of comparative proteomics and association genetics led to the discovery of novel candidate genes for influencing the natural variation of quantitative traits in potato tubers. One such gene was a leucine aminopeptidase not considered so far to play a role in starch sugar interconversion. Novel SNP's diagnostic for increased tuber starch content, starch yield and chip quality were identified, which are useful for selecting improved potato processing cultivars.
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Affiliation(s)
- Matthias Fischer
- Department of Plant Breeding and Genetics, Max-Planck-Institute for Plant Breeding Research, Cologne, Germany.
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Rollins JA, Habte E, Templer SE, Colby T, Schmidt J, von Korff M. Leaf proteome alterations in the context of physiological and morphological responses to drought and heat stress in barley (Hordeum vulgare L.). JOURNAL OF EXPERIMENTAL BOTANY 2013; 64:3201-12. [PMID: 23918963 PMCID: PMC3733145 DOI: 10.1093/jxb/ert158] [Citation(s) in RCA: 148] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The objective of this study was to identify barley leaf proteins differentially regulated in response to drought and heat and the combined stresses in context of the morphological and physiological changes that also occur. The Syrian landrace Arta and the Australian cultivar Keel were subjected to drought, high temperature, or a combination of both treatments starting at heading. Changes in the leaf proteome were identified using differential gel electrophoresis and mass spectrometry. The drought treatment caused strong reductions of biomass and yield, while photosynthetic performance and the proteome were not significantly changed. In contrast, the heat treatment and the combination of heat and drought reduced photosynthetic performance and caused changes of the leaf proteome. The proteomic analysis identified 99 protein spots differentially regulated in response to heat treatment, 14 of which were regulated in a genotype-specific manner. Differentially regulated proteins predominantly had functions in photosynthesis, but also in detoxification, energy metabolism, and protein biosynthesis. The analysis indicated that de novo protein biosynthesis, protein quality control mediated by chaperones and proteases, and the use of alternative energy resources, i.e. glycolysis, play important roles in adaptation to heat stress. In addition, genetic variation identified in the proteome, in plant growth and photosynthetic performance in response to drought and heat represent stress adaption mechanisms to be exploited in future crop breeding efforts.
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Affiliation(s)
- J. A. Rollins
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Köln, Germany
| | - E. Habte
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Köln, Germany
| | - S. E. Templer
- Julius Kuehn-Institute (JKI), Federal Research Centre for Cultivated Plants, Institute for Resistance Research and Stress Tolerance, Erwin-Baur-Str. 27, 06484 Quedlinburg, Germany
| | - T. Colby
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Köln, Germany
| | - J. Schmidt
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Köln, Germany
| | - M. von Korff
- Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Köln, Germany
- * To whom correspondence should be addressed. E-mail:
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Jankowski V, Tölle M, Tran TNA, van der Giet M, Schuchardt M, Lehmann K, Janke D, Flick B, Ortiz AA, Sanchez NMD, Tepel M, Zidek W, Jankowski J. Identification of a potent endothelium-derived angiogenic factor. PLoS One 2013; 8:e68575. [PMID: 23922657 PMCID: PMC3726690 DOI: 10.1371/journal.pone.0068575] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Accepted: 05/29/2013] [Indexed: 11/18/2022] Open
Abstract
The secretion of angiogenic factors by vascular endothelial cells is one of the key mechanisms of angiogenesis. Here we report on the isolation of a new potent angiogenic factor, diuridine tetraphosphate (Up4U) from the secretome of human endothelial cells. The angiogenic effect of the endothelial secretome was partially reduced after incubation with alkaline phosphatase and abolished in the presence of suramin. In one fraction, purified to homogeneity by reversed phase and affinity chromatography, Up4U was identified by MALDI-LIFT-fragment-mass-spectrometry, enzymatic cleavage analysis and retention-time comparison. Beside a strong angiogenic effect on the yolk sac membrane and the developing rat embryo itself, Up4U increased the proliferation rate of endothelial cells and, in the presence of PDGF, of vascular smooth muscle cells. Up4U stimulated the migration rate of endothelial cells via P2Y2-receptors, increased the ability of endothelial cells to form capillary-like tubes and acts as a potent inducer of sprouting angiogenesis originating from gel-embedded EC spheroids. Endothelial cells released Up4U after stimulation with shear stress. Mean total plasma Up4U concentrations of healthy subjects (N=6) were sufficient to induce angiogenic and proliferative effects (1.34 ± 0.26 nmol L(-1)). In conclusion, Up4U is a novel strong human endothelium-derived angiogenic factor.
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MESH Headings
- Adult
- Angiogenesis Inducing Agents/chemistry
- Angiogenesis Inducing Agents/metabolism
- Angiogenesis Inducing Agents/pharmacology
- Animals
- Cell Movement/drug effects
- Chorioallantoic Membrane/drug effects
- Chorioallantoic Membrane/embryology
- Embryo, Mammalian/metabolism
- Endothelial Cells/cytology
- Endothelial Cells/drug effects
- Endothelial Cells/enzymology
- Endothelium, Vascular/cytology
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- Humans
- In Vitro Techniques
- Mitogen-Activated Protein Kinases/metabolism
- Molecular Weight
- Muscle, Smooth, Vascular/cytology
- Myocytes, Smooth Muscle/cytology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Phosphorylation/drug effects
- Platelet-Derived Growth Factor/pharmacology
- Rats
- Rats, Wistar
- Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
- Uracil Nucleotides/chemistry
- Uracil Nucleotides/metabolism
- Uracil Nucleotides/pharmacology
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Affiliation(s)
- Vera Jankowski
- Charité-Universitaetsmedizin Berlin, Medizinische Klinik IV (CBF), Berlin, Germany
| | - Markus Tölle
- Charité-Universitaetsmedizin Berlin, Medizinische Klinik IV (CBF), Berlin, Germany
| | - Thi Nguyet Anh Tran
- Charité-Universitaetsmedizin Berlin, Medizinische Klinik IV (CBF), Berlin, Germany
| | - Markus van der Giet
- Charité-Universitaetsmedizin Berlin, Medizinische Klinik IV (CBF), Berlin, Germany
| | - Mirjam Schuchardt
- Charité-Universitaetsmedizin Berlin, Medizinische Klinik IV (CBF), Berlin, Germany
| | - Kerstin Lehmann
- Julius Wolff Institute and Berlin-Brandenburg Center for Regenerative Therapies, Charite – Universitaetsmedizin Berlin, Berlin, Germany
| | - Doreen Janke
- Julius Wolff Institute and Berlin-Brandenburg Center for Regenerative Therapies, Charite – Universitaetsmedizin Berlin, Berlin, Germany
| | - Burkhard Flick
- Charité-Universitaetsmedizin Berlin, Institute of Toxicology (CBF), Berlin, Germany
| | | | | | - Martin Tepel
- University of Southern Denmark, Institute of Molecular Medicine, Odense, Denmark
| | - Walter Zidek
- Charité-Universitaetsmedizin Berlin, Medizinische Klinik IV (CBF), Berlin, Germany
| | - Joachim Jankowski
- Charité-Universitaetsmedizin Berlin, Medizinische Klinik IV (CBF), Berlin, Germany
- * E-mail:
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43
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Yao C, Zhuang H, Du P, Cheng W, Yang B, Guan S, Hu Y, Zhu D, Christine M, Shi L, Hua ZC. Role of Fas-associated death domain-containing protein (FADD) phosphorylation in regulating glucose homeostasis: from proteomic discovery to physiological validation. Mol Cell Proteomics 2013; 12:2689-700. [PMID: 23828893 DOI: 10.1074/mcp.m113.029306] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Fas-associated death domain-containing protein (FADD), a classical apoptotic signaling adaptor, participates in different nonapoptotic processes regulated by its phosphorylation. However, the influence of FADD on metabolism, especially glucose homeostasis, has not been evaluated to date. Here, using both two-dimensional electrophoresis and liquid chromatography linked to tandem mass spectrometry (LC/MS/MS), we found that glycogen synthesis, glycolysis, and gluconeogenesis were dysregulated because of FADD phosphorylation, both in MEFs and liver tissue of the mice bearing phosphorylation-mimicking mutation form of FADD (FADD-D). Further physiological studies showed that FADD-D mice exhibited lower blood glucose, enhanced glucose tolerance, and increased liver glycogen content without alterations in insulin sensitivity. Moreover, investigations on the molecular mechanisms revealed that, under basal conditions, FADD-D mice had elevated phosphorylation of Akt with alterations in its downstream signaling, leading to increased glycogen synthesis and decreased gluconeogenesis. Thus, we uncover a novel role of FADD in the regulation of glucose homeostasis by proteomic discovery and physiological validation.
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Affiliation(s)
- Chun Yao
- The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, 210093, China
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44
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Huang L, Xiao X, Xie Y, Kageruka H, Zhou Y, Deng F, Zhong H. Compressed matrix thin film (CMTF)-assisted laser desorption ionization mass spectrometric analysis. Anal Chim Acta 2013; 786:85-94. [DOI: 10.1016/j.aca.2013.05.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Revised: 04/30/2013] [Accepted: 05/03/2013] [Indexed: 12/25/2022]
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Rechthaler J, Pittenauer E, Schaub TM, Allmaier G. Detection of amine impurity and quality assessment of the MALDI matrix α-cyano-4-hydroxy-cinnamic acid for peptide analysis in the amol range. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2013; 24:701-710. [PMID: 23595260 DOI: 10.1007/s13361-013-0614-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 02/07/2013] [Accepted: 03/19/2013] [Indexed: 06/02/2023]
Abstract
We have studied sample preparation conditions to increase the reproducibility of positive UV-MALDI-TOF mass spectrometry of peptides in the amol range. By evaluating several α-cyano-4-hydroxy-cinnamic acid (CHCA) matrix batches and preparation protocols, it became apparent that two factors have a large influence on the reproducibility and the quality of the generated peptide mass spectra: (1) the selection of the CHCA matrix, which allows the most sensitive measurements and an easier finding of the "sweet spots," and (2) the amount of the sample volume deposited onto the thin crystalline matrix layer. We have studied in detail the influence of a contaminant, coming from commercial CHCA matrix batches, on sensitivity of generated peptide mass spectra in the amol as well as fmol range of a tryptic peptide mixture. The structure of the contaminant, N,N-dimethylbutyl amine, was determined by applying MALDI-FT-ICR mass spectrometry experiments for elemental composition and MALDI high energy CID experiments utilizing a tandem mass spectrometer (TOF/RTOF). A recrystallization of heavily contaminated CHCA batches that reduces or eliminates the determined impurity is described. Furthermore, a fast and reliable method for the assessment of CHCA matrix batches prior to tryptic peptide MALDI mass spectrometric analyses is presented.
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Affiliation(s)
- Justyna Rechthaler
- Institute of Chemical Technologies and Analytics, Vienna University of Technology, Vienna, Austria
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46
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Jankowski V, Schulz A, Kretschmer A, Mischak H, Boehringer F, van der Giet M, Janke D, Schuchardt M, Herwig R, Zidek W, Jankowski J. The enzymatic activity of the VEGFR2 receptor for the biosynthesis of dinucleoside polyphosphates. J Mol Med (Berl) 2013; 91:1095-107. [PMID: 23636508 DOI: 10.1007/s00109-013-1036-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2012] [Revised: 03/04/2013] [Accepted: 03/25/2013] [Indexed: 10/26/2022]
Abstract
The group of dinucleoside polyphosphates encompasses a large number of molecules consisting of two nucleosides which are connected by a phosphate chain of variable length. While the receptors activated by dinucleoside polyphosphates as well as their degradation have been studied in detail, its biosynthesis has not been elucidated so far. Since endothelial cells released the dinucleoside polyphosphate uridine adenosine tetraphosphate (Up4A), we tested cytosolic proteins of human endothelial cells obtained from dermal vessels elicited for enzymatic activity. When incubated with ADP and UDP, these cells showed increasing concentrations of Up4A. The underlying enzyme was isolated by chromatography and the mass spectrometric analysis revealed that the enzymatic activity was caused by the vascular endothelial growth factor receptor 2 (VEGFR2). Since VEGFR2 but neither VEGFR1 nor VEGFR3 were capable to synthesise dinucleoside polyphosphates, Tyr-1175 of VEGFR2 is most likely essential for the enzymatic activity of interest. Further, VEGFR2-containing cells like HepG2, THP-1 and RAW264.7 were capable of synthesising dinucleoside polyphosphates. VEGFR2-transfected HEK 293T/17 but not native HEK 293T/17 cells synthesised dinucleoside polyphosphates in vivo too. The simultaneous biosynthesis of dinucleoside polyphosphates could amplify the response to VEGF, since dinucleoside polyphosphates induce cellular growth via P2Y purinergic receptors. Thus the biosynthesis of dinucleoside polyphosphates by VEGFR2 may enhance the proliferative response to VEGF. Given that VEGFR2 is primarily expressed in endothelial cells, the biosynthesis of dinucleoside polyphosphates is mainly located in the vascular system. Since the vasculature is also the main site of action of dinucleoside polyphosphates, activating vascular purinoceptors, blood vessels appear as an autocrine system with respect to dinucleoside polyphosphates. We conclude that VEGFR2 receptor is capable of synthesising dinucleoside polyphosphates. These mediators may modulate the effects of VEGFR2 due to their proliferative effects.
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Affiliation(s)
- Vera Jankowski
- Charité-Universitaetsmedizin Berlin, Medizinische Klinik IV, Hindenburgdamm 30, D-12200, Berlin, Germany.
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47
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Li H, Zhang XY, Wu TJ, Cheng W, Liu X, Jiang TT, Wen J, Li J, Ma QL, Hua ZC. Endoplasmic reticulum stress regulates rat mandibular cartilage thinning under compressive mechanical stress. J Biol Chem 2013; 288:18172-83. [PMID: 23603905 DOI: 10.1074/jbc.m112.407296] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Compressive mechanical stress-induced cartilage thinning has been characterized as a key step in the progression of temporomandibular joint diseases, such as osteoarthritis. However, the regulatory mechanisms underlying this loss have not been thoroughly studied. Here, we used an established animal model for loading compressive mechanical stress to induce cartilage thinning in vivo. The mechanically stressed mandibular chondrocytes were then isolated to screen potential candidates using a proteomics approach. A total of 28 proteins were identified that were directly or indirectly associated with endoplasmic reticulum stress, including protein disulfide-isomerase, calreticulin, translationally controlled tumor protein, and peptidyl-prolyl cis/trans-isomerase protein. The altered expression of these candidates was validated at both the mRNA and protein levels. The induction of endoplasmic reticulum stress by mechanical stress loading was confirmed by the activation of endoplasmic reticulum stress markers, the elevation of the cytoplasmic Ca(2+) level, and the expansion of endoplasmic reticulum membranes. More importantly, the use of a selective inhibitor to block endoplasmic reticulum stress in vivo reduced the apoptosis observed at the early stages of mechanical stress loading and inhibited the proliferation observed at the later stages of mechanical stress loading. Accordingly, the use of the inhibitor significantly restored cartilage thinning. Taken together, these results demonstrated that endoplasmic reticulum stress is significantly activated in mechanical stress-induced mandibular cartilage thinning and, more importantly, that endoplasmic reticulum stress inhibition alleviates this loss, suggesting a novel pharmaceutical strategy for the treatment of mechanical stress-induced temporomandibular joint diseases.
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Affiliation(s)
- Huang Li
- School of Stomatology and State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, 30 Zhongyang Road, Nanjing 210009, China.
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48
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Abstract
Metabolic stimuli, pressure, and fluid shear stress (FSS) are major mediators of vascular plasticity. The exposure of the vessel wall to increased laminar FSS is the main trigger of arteriogenesis, the remodelling of pre-existent arterio-arteriolar anastomoses to functional conductance arteries. In this study, we have used an in vitro bioreactor to investigate cell-specific interactions, molecular mechanisms as well as time-dependent effects under laminar FSS conditions. This bioreactor termed “artificial artery” can be used for screening potential arterio-protective substances, pro-arteriogenic factors, and for investigating biomarkers of cardiovascular diseases such as cardiac diseases. The bioreactor is built up out of 14 hollow fiber membranes colonized with endothelial cells (HUVECs) on the inside and smooth muscle cells (HUASMCs) on the outside. By means of Hoechst 33342 staining as well as immunocytochemistry of ß-catenin and α-smooth-muscle-actin, a microporous polypropylene membrane was characterized as being the appropriate polymer for co-colonization. Defined arterial flow conditions (0.1 N/m2 and 3 N/m2), metabolic exchange, and cross-talk of HUVECs and HUASMCs through hollow fibers mimic physiological in vivo conditions of the vasculature. Analysing mono- and co-culture secretomes by MALDI-TOF-TOF mass spectrometry, we could show that HUVECs secreted Up4A upon 3 N/m2. A constant cellular secretion of randomly chosen peptides verified viability of the “artificial artery” for a cultivation period up to five days. qRT-PCR analyses revealed an up-regulation of KLF2 and TIMP1 as mechano-regulated genes and demonstrated arterio-protective, homeostatic FSS conditions by a down-regulation of EDN1. Expression analyses of VWF and EDN1 furthermore confirmed that RNA of both cell types could separately be isolated without cross-contamination. CCND1 mRNA expression in HUVECs did not change upon FSS indicating a quiescent endothelial phenotype. Taken together, the “artificial artery” provides a solid in vitro model to test pharmacological active compounds for their impact on arterio-damaging or arterio-protective properties on vascular response.
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49
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Beyer NH, Heegaard NHH. Identification of the antigen content of electroimmunoprecipitates. Methods Mol Biol 2013; 1061:123-140. [PMID: 23963934 DOI: 10.1007/978-1-62703-589-7_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Polyclonal antibodies including purified antibody fractions and animal or human antisera may react with unknown antigens or antigens other than their main specificity in reactions that are best visualized by gel electroimmunoprecipitation methods, e.g., when analyzing complex antigen mixtures. The great advantage of gel immunoprecipitation approaches is that each immunoprecipitate contains antigen in a pure form and that the precipitate is separated by position, shape, and size from other precipitates in the complex patterns of crossed immunoelectrophoresis. The identification of the antigen content of such immunoprecipitates is important but challenging because of the very stable, high affinity complex formation leading to precipitation in the gels. Here, we present detailed step-by-step recipes for identifying the antigen content of electroimmunoprecipitates.
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50
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Zhuang H, Gan Z, Jiang W, Zhang X, Hua ZC. Functional specific roles of FADD: comparative proteomic analyses from knockout cell lines. MOLECULAR BIOSYSTEMS 2013; 9:2063-78. [DOI: 10.1039/c3mb70023b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Comparative proteomics identification combined with bioinformatic analyses and cell biology validation revealed novel non-apoptotic functions of FADD in energy metabolism and proteolysis.
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Affiliation(s)
- Hongqin Zhuang
- The State Key Laboratory of Pharmaceutical Biotechnology
- College of Life Science and School of Stomatology
- Affiliated Stomatological Hospital
- Nanjing University
- Nanjing 210093
| | - Ziyi Gan
- The State Key Laboratory of Pharmaceutical Biotechnology
- College of Life Science and School of Stomatology
- Affiliated Stomatological Hospital
- Nanjing University
- Nanjing 210093
| | - Weiwei Jiang
- The State Key Laboratory of Pharmaceutical Biotechnology
- College of Life Science and School of Stomatology
- Affiliated Stomatological Hospital
- Nanjing University
- Nanjing 210093
| | - Xiangyu Zhang
- The State Key Laboratory of Pharmaceutical Biotechnology
- College of Life Science and School of Stomatology
- Affiliated Stomatological Hospital
- Nanjing University
- Nanjing 210093
| | - Zi-Chun Hua
- The State Key Laboratory of Pharmaceutical Biotechnology
- College of Life Science and School of Stomatology
- Affiliated Stomatological Hospital
- Nanjing University
- Nanjing 210093
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