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Lotsios NS, Keskinidou C, Dimopoulou I, Kotanidou A, Langleben D, Orfanos SE, Vassiliou AG. Effects of Modulating BMP9, BMPR2, and AQP1 on BMP Signaling in Human Pulmonary Microvascular Endothelial Cells. Int J Mol Sci 2024; 25:8043. [PMID: 39125626 PMCID: PMC11311989 DOI: 10.3390/ijms25158043] [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] [Received: 06/27/2024] [Revised: 07/19/2024] [Accepted: 07/22/2024] [Indexed: 08/12/2024] Open
Abstract
Pulmonary arterial hypertension (PAH) is a chronic disease characterized by a progressive increase in mean pulmonary arterial pressure. Mutations in the BMPR2 and AQP1 genes have been described in familial PAH. The bone morphogenetic proteins BMP9 and BMP10 bind with high affinity to BMPR2. Administration of BMP9 has been proposed as a potential therapeutic strategy against PAH, although recent conflicting evidence dispute the effect of such a practice. Considering the involvement of the above molecules in PAH onset, progression, and therapeutic value, we examined the effects of modulation of BMP9, BMPR2, and AQP1 on BMP9, BMP10, BMPR2, AQP1, and TGFB1 expression in human pulmonary microvascular endothelial cells in vitro. Our results demonstrated that silencing the BMPR2 gene resulted in increased expression of its two main ligands, namely BMP9 and BMP10. Exogenous administration of BMP9 caused the return of BMP10 to basal levels, while it restored the decreased AQP1 protein levels and the decreased TGFB1 mRNA and protein expression levels caused by BMPR2 silencing. Moreover, AQP1 gene silencing also resulted in increased expression of BMP9 and BMP10. Our results might possibly imply that the effect of exogenously administered BMP9 on molecules participating in the BMP signaling pathway could depend on the expression levels of BMPR2. Taken together, these results may provide insight into the highly complex interactions of the BMP signaling pathway.
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Affiliation(s)
- Nikolaos S. Lotsios
- First Department of Critical Care Medicine & Pulmonary Services, School of Medicine, National and Kapodistrian University of Athens, Evangelismos Hospital, 106 76 Athens, Greece; (N.S.L.); (C.K.); (I.D.); (A.K.)
| | - Chrysi Keskinidou
- First Department of Critical Care Medicine & Pulmonary Services, School of Medicine, National and Kapodistrian University of Athens, Evangelismos Hospital, 106 76 Athens, Greece; (N.S.L.); (C.K.); (I.D.); (A.K.)
| | - Ioanna Dimopoulou
- First Department of Critical Care Medicine & Pulmonary Services, School of Medicine, National and Kapodistrian University of Athens, Evangelismos Hospital, 106 76 Athens, Greece; (N.S.L.); (C.K.); (I.D.); (A.K.)
| | - Anastasia Kotanidou
- First Department of Critical Care Medicine & Pulmonary Services, School of Medicine, National and Kapodistrian University of Athens, Evangelismos Hospital, 106 76 Athens, Greece; (N.S.L.); (C.K.); (I.D.); (A.K.)
| | - David Langleben
- Center for Pulmonary Vascular Disease, Azrieli Heart Center and Lady Davis Institute, Jewish General Hospital, McGill University, Montreal, QC H3T 1E2, Canada;
| | - Stylianos E. Orfanos
- First Department of Critical Care Medicine & Pulmonary Services, School of Medicine, National and Kapodistrian University of Athens, Evangelismos Hospital, 106 76 Athens, Greece; (N.S.L.); (C.K.); (I.D.); (A.K.)
| | - Alice G. Vassiliou
- First Department of Critical Care Medicine & Pulmonary Services, School of Medicine, National and Kapodistrian University of Athens, Evangelismos Hospital, 106 76 Athens, Greece; (N.S.L.); (C.K.); (I.D.); (A.K.)
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Lotsios NS, Arvanitis N, Charonitakis AG, Mpekoulis G, Frakolaki E, Vassilaki N, Sideris DC, Vassilacopoulou D. Expression of Human L-Dopa Decarboxylase (DDC) under Conditions of Oxidative Stress. Curr Issues Mol Biol 2023; 45:10179-10192. [PMID: 38132481 PMCID: PMC10742706 DOI: 10.3390/cimb45120635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 12/06/2023] [Accepted: 12/11/2023] [Indexed: 12/23/2023] Open
Abstract
Oxidative stress is known to influence mRNA levels, translation, and proteolysis. The importance of oxidative stress has been demonstrated in several human diseases, including neurodegenerative disorders. L-Dopa decarboxylase (DDC) is the enzyme that converts L-Dopa to dopamine (DA). In spite of a large number of studies, little is known about the biological significance of the enzyme under physiological and pathological conditions. Here, we investigated the relationship between DDC expression and oxidative stress in human neural and non-neural cells. Oxidative stress was induced by treatment with H2O2. Our data indicated that mRNA and protein expression of DDC was enhanced or remained stable under conditions of ROS induction, despite degradation of total RNA and increased cytotoxicity and apoptosis. Moreover, DDC silencing caused an increase in the H2O2-induced cytotoxicity. The current study suggests that DDC is involved in the mechanisms of oxidative stress.
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Affiliation(s)
- Nikolaos S. Lotsios
- Section of Biochemistry and Molecular Biology, Department of Biology, National and Kapodistrian University of Athens, 15701 Athens, Greece; (N.S.L.); (N.A.); (A.G.C.); (D.C.S.)
| | - Nikolaos Arvanitis
- Section of Biochemistry and Molecular Biology, Department of Biology, National and Kapodistrian University of Athens, 15701 Athens, Greece; (N.S.L.); (N.A.); (A.G.C.); (D.C.S.)
| | - Alexandros G. Charonitakis
- Section of Biochemistry and Molecular Biology, Department of Biology, National and Kapodistrian University of Athens, 15701 Athens, Greece; (N.S.L.); (N.A.); (A.G.C.); (D.C.S.)
| | - George Mpekoulis
- Laboratory of Molecular Virology, Hellenic Pasteur Institute (HPI), 11521 Athens, Greece; (G.M.); (N.V.)
| | - Efseveia Frakolaki
- Laboratory of Molecular Virology, Hellenic Pasteur Institute (HPI), 11521 Athens, Greece; (G.M.); (N.V.)
| | - Niki Vassilaki
- Laboratory of Molecular Virology, Hellenic Pasteur Institute (HPI), 11521 Athens, Greece; (G.M.); (N.V.)
| | - Diamantis C. Sideris
- Section of Biochemistry and Molecular Biology, Department of Biology, National and Kapodistrian University of Athens, 15701 Athens, Greece; (N.S.L.); (N.A.); (A.G.C.); (D.C.S.)
| | - Dido Vassilacopoulou
- Section of Biochemistry and Molecular Biology, Department of Biology, National and Kapodistrian University of Athens, 15701 Athens, Greece; (N.S.L.); (N.A.); (A.G.C.); (D.C.S.)
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Boumar I, Deliorman M, Sukumar P, Qasaimeh MA. Spike- and nucleocapsid-based gold colloid assay toward the development of an adhesive bandage for rapid SARS-CoV-2 immune response detection and screening. MICROSYSTEMS & NANOENGINEERING 2023; 9:82. [PMID: 37351273 PMCID: PMC10281977 DOI: 10.1038/s41378-023-00554-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 05/02/2023] [Accepted: 05/14/2023] [Indexed: 06/24/2023]
Abstract
Immunoglobulin M (IgM) and immunoglobulin G (IgG) antibodies are important biomarkers used for the diagnosis and screening of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections in both symptomatic and asymptomatic individuals. These antibodies are highly specific to the spike (S) and nucleocapsid (N) proteins of the SARS-CoV-2 virus. This paper outlines the development steps of a novel hybrid (vertical-lateral-vertical) flow assay in the form of a finger-stick point-of-care device, similar to an adhesive bandage, designed for the timely detection and screening of IgM and IgG immune responses to SARS-CoV-2 infections. The assay, comprising a vertically stacked plasma/serum separation membrane, conjugate pad, and detection (readout) zone, utilizes gold nanoparticles (AuNPs) conjugated with SARS-CoV-2 S and N proteins to effectively capture IgM and IgG antibodies from a pinprick (~15 µL) of blood in just one step and provides results of no immune IgM-/IgG-, early immune IgM+/IgG-, active immune IgM+/IgG+ or immune IgM-/IgG+ in a short amount of time (minutes). The adhesive bandage-like construction is an example of the design of rapid, low-cost, disposable, and easy-to-use tests for large-scale detection and screening in households. Furthermore, the bandage can be easily adjusted and optimized to detect different viral infections as they arise by simply selecting appropriate antigens related to pandemics and outbreaks.
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Affiliation(s)
- Imen Boumar
- Division of Engineering, New York University Abu Dhabi (NYUAD), Abu Dhabi, UAE
| | | | - Pavithra Sukumar
- Division of Engineering, New York University Abu Dhabi (NYUAD), Abu Dhabi, UAE
| | - Mohammad A. Qasaimeh
- Division of Engineering, New York University Abu Dhabi (NYUAD), Abu Dhabi, UAE
- NYU Tandon School of Engineering, New York University, New York, USA
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4
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Reynoso-Hernández KB, Guevara-Pantoja PE, Caballero-Robledo GA. Capture efficiency of magnetic nanoparticles through the compaction effect of a microparticles column. Phys Rev E 2021; 104:024603. [PMID: 34525671 DOI: 10.1103/physreve.104.024603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 07/21/2021] [Indexed: 11/07/2022]
Abstract
When a magnetic nanoparticle solution flows through a porous medium formed by iron microparticles packed in a microfluidic channel, the nanoparticles get trapped within the column in the presence of a magnet. A complex interplay between magnetic and fluid forces within the magnetized porous medium governs the trapping of nanoparticles. However, how does the packing state of the microparticles affect the trapping of nanoparticles? Will more nanoparticles be trapped on a loose or a tight packing? In this work, we present experiments that show that the capture of nanoparticles is determined by the total volume occupied by the column, independent of its packing density. We present a simple analytical model based on the competition of drag and magnetic forces that shows that our system can be useful to develop and test more complete and accurate models. We also developed a technique to measure the columns' minute mass and its packing density, which consists of injecting polydimethylsiloxane into the acrylic microfluidic device. Our work can help with the optimization of environmental and biomedical applications based on high-gradient magnetic nanoparticle separation.
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Li S, Lin H, Huang J, Zhu L, Jiang Y, Li Z, Lin H. Preparation of soybean β-conglycinin epitope antibody and its preliminary application in frozen surimi detection. Eur Food Res Technol 2021. [DOI: 10.1007/s00217-021-03719-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
Fine structure immunocytochemistry enables the in situ localization of odorant-binding proteins with the high resolution of the electron microscope. Protocols for successfully labeling these proteins in insect chemosensory sensilla are given and some pitfalls pinpointed as well as ways to avoid them. The major achievements accomplished by these methods are briefly reviewed.
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Chalatsa I, Arvanitis N, Arvanitis D, Tsakou AC, Kalantzis ED, Vassiliou AG, Sideris DC, Frakolaki E, Vassilaki N, Vassilacopoulou D. Human L-Dopa decarboxylase interaction with annexin V and expression during apoptosis. Biochimie 2020; 177:78-86. [PMID: 32835737 DOI: 10.1016/j.biochi.2020.08.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 07/30/2020] [Accepted: 08/17/2020] [Indexed: 01/13/2023]
Abstract
l-Dopa Decarboxylase (DDC) is a pyridoxal requiring enzyme that catalyzes the decarboxylation of L-3,4-dihydroxyphenylalanine (l-Dopa) to Dopamine (DA). The function of DDC in physiological and pathological biochemical pathways remains poorly understood, while the function and regulation of human DDC isoforms is almost completely elusive. We have shown that Annexin V, a fundamental apoptosis marker, is an inhibitor of l-Dopa decarboxylase activity. Here we show the interaction of both the full-length DDC and the truncated isoform alternative DDC (Alt-DDC) with Annexin V in human tissue and cell lines. Interestingly, DDC isoform expression is enhanced or remains unaffected following staurosporine (STS) treatment, despite increased levels of cytotoxicity and apoptosis. The findings presented here provide novel insights concerning the involvement of DDC in programmed cell death.
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Affiliation(s)
- Ioanna Chalatsa
- Department of Biochemistry and Molecular Biology, National and Kapodistrian University of Athens, Panepistimiopolis, 15701, Athens, Greece; Neurodegenerative Diseases Division, Center for Basic Research, Foundation for Biomedical Research of the Academy of Athens, 4 Soranou Ephessiou Street, 115 27, Athens, Greece
| | - Nikolaos Arvanitis
- Department of Biochemistry and Molecular Biology, National and Kapodistrian University of Athens, Panepistimiopolis, 15701, Athens, Greece
| | - Dimitrios Arvanitis
- Department of Biochemistry and Molecular Biology, National and Kapodistrian University of Athens, Panepistimiopolis, 15701, Athens, Greece
| | - Anastasia C Tsakou
- Department of Biochemistry and Molecular Biology, National and Kapodistrian University of Athens, Panepistimiopolis, 15701, Athens, Greece
| | - Evangelos D Kalantzis
- Department of Biochemistry and Molecular Biology, National and Kapodistrian University of Athens, Panepistimiopolis, 15701, Athens, Greece
| | - Alice G Vassiliou
- 1st Department of Critical Care Medicine & Pulmonary Services, GP Livanos and M Simou Laboratories, Evangelismos Hospital, Athens Medical School, National & Kapodistrian University of Athens, Athens, Greece
| | - Diamantis C Sideris
- Department of Biochemistry and Molecular Biology, National and Kapodistrian University of Athens, Panepistimiopolis, 15701, Athens, Greece
| | - Efseveia Frakolaki
- Laboratory of Molecular Virology, Hellenic Pasteur Institute (HPI), Vas. Sofias 127 av, 11521, Athens, Greece
| | - Niki Vassilaki
- Laboratory of Molecular Virology, Hellenic Pasteur Institute (HPI), Vas. Sofias 127 av, 11521, Athens, Greece
| | - Dido Vassilacopoulou
- Department of Biochemistry and Molecular Biology, National and Kapodistrian University of Athens, Panepistimiopolis, 15701, Athens, Greece.
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Vassiliou AG, Keskinidou C, Kotanidou A, Frantzeskaki F, Dimopoulou I, Langleben D, Orfanos SE. Knockdown of bone morphogenetic protein type II receptor leads to decreased aquaporin 1 expression and function in human pulmonary microvascular endothelial cells. Can J Physiol Pharmacol 2020; 98:834-839. [PMID: 32687728 DOI: 10.1139/cjpp-2020-0185] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Bone morphogenetic proteins (BMPs) were once considered only to have a role in bone formation. It is now known that they have pivotal roles in other organ diseases, including heritable pulmonary arterial hypertension (PAH), where genetic mutations in the type II BMP receptor (BMPR2) are the commonest cause of receptor dysfunction. However, it has also recently been demonstrated that aquaporin 1 (Aqp1) dysfunction may contribute to PAH, highlighting that PAH development may involve more than one pathogenic pathway. Whether reduction in BMPR2 affects Aqp1 is unknown. We therefore studied Aqp1 in BMPR2-silenced human pulmonary microvascular endothelial cells (HPMECs). We demonstrated reduced Aqp1 mRNA, protein, and function in the BMPR2-silenced cells. Additionally, BMPR2-silenced cells exhibited lower expression of BMP-signaling molecules. In conclusion, decreased BMPR2 appears to affect Aqp1 at the mRNA, protein, and functional levels. This observation may identify a contributory mechanism for PAH.
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Affiliation(s)
- Alice G Vassiliou
- First Department of Critical Care Medicine and Pulmonary Services, GP Livanos and M Simou Laboratories, National and Kapodistrian University of Athens Medical School, Evangelismos Hospital, Athens, Greece
| | - Chrysi Keskinidou
- First Department of Critical Care Medicine and Pulmonary Services, GP Livanos and M Simou Laboratories, National and Kapodistrian University of Athens Medical School, Evangelismos Hospital, Athens, Greece.,Medical School of Democritus University of Thrace, 6th km Alexandroupolis-Dragana, Greece
| | - Anastasia Kotanidou
- First Department of Critical Care Medicine and Pulmonary Services, GP Livanos and M Simou Laboratories, National and Kapodistrian University of Athens Medical School, Evangelismos Hospital, Athens, Greece.,First Department of Critical Care Medicine and Pulmonary Services, National and Kapodistrian University of Athens Medical School, Evangelismos Hospital, Athens, Greece
| | - Frantzeska Frantzeskaki
- Second Department of Critical Care, National and Kapodistrian University of Athens Medical School, "Attikon" Hospital, Athens, Greece
| | - Ioanna Dimopoulou
- First Department of Critical Care Medicine and Pulmonary Services, National and Kapodistrian University of Athens Medical School, Evangelismos Hospital, Athens, Greece
| | - David Langleben
- Center for Pulmonary Vascular Disease, Division of Cardiology, Azrieli Heart Center, and Lady Davis Institute for Medical Research, Jewish General Hospital, McGill University, Montreal, QC H3T 1E2, Canada
| | - Stylianos E Orfanos
- First Department of Critical Care Medicine and Pulmonary Services, GP Livanos and M Simou Laboratories, National and Kapodistrian University of Athens Medical School, Evangelismos Hospital, Athens, Greece.,First Department of Critical Care Medicine and Pulmonary Services, National and Kapodistrian University of Athens Medical School, Evangelismos Hospital, Athens, Greece.,Second Department of Critical Care, National and Kapodistrian University of Athens Medical School, "Attikon" Hospital, Athens, Greece
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9
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Heda GD, Shrestha L, Thapa S, Ghimire S, Raut D. Optimization of western blotting for the detection of proteins of different molecular weight. Biotechniques 2020; 68:318-324. [PMID: 32283940 PMCID: PMC7333534 DOI: 10.2144/btn-2019-0124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Accepted: 03/04/2020] [Indexed: 12/19/2022] Open
Abstract
Protein samples electroblotted onto nitrocellulose membranes and quenched with a mixture of blocking agents produced a strong signal for cystic fibrosis transmembrane-conductance regulator (CFTR), a high-molecular-weight protein, in western blotting. Optimized conditions for CFTR were then extended to medium- and low-molecular-weight proteins (LAMP1 and Rab11a, respectively) to determine the effects of methanol concentration (0-20%) in Towbin's transfer buffer (TTB). Methanol in TTB appears to have little to no effect on CFTR signal. However, for medium-sized (LAMP1) and small (Rab11a) proteins, a lower concentration of methanol (10%) was sufficient to produce a maximal signal. Therefore, methanol, a toxic solvent, can be removed from or reduced in TTB without compromising signal strength. Here, we show modifications that may be useful in detecting and/or improving the signal of low-abundance proteins.
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Affiliation(s)
- Ghanshyam D Heda
- Department of Sciences & Mathematics, Mississippi University for Women, Columbus, MS 39701, USA
| | - Lisa Shrestha
- Department of Sciences & Mathematics, Mississippi University for Women, Columbus, MS 39701, USA
- Molecular Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Sagarina Thapa
- Department of Sciences & Mathematics, Mississippi University for Women, Columbus, MS 39701, USA
- Department of Genetics, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Shreya Ghimire
- Department of Sciences & Mathematics, Mississippi University for Women, Columbus, MS 39701, USA
- Department of Internal Medicine, The University of Iowa, Iowa City, IA 52240, USA
| | - Diptika Raut
- Department of Sciences & Mathematics, Mississippi University for Women, Columbus, MS 39701, USA
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Stefi AL, Mitsigiorgi K, Vassilacopoulou D, Christodoulakis NS. Response of young Nerium oleander plants to long-term non-ionizing radiation. PLANTA 2020; 251:108. [PMID: 32462472 DOI: 10.1007/s00425-020-03405-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 05/18/2020] [Indexed: 06/11/2023]
Abstract
Although exposure to low frequency electromagnetic radiation is harmful to plants, LF-EM irradiated Nerium oleander seedlings exhibited enhanced development and growth, probably taking advantage of defined structural leaf deformations. Currently, evidence supports the undesirable, often destructive impact of low frequency electromagnetic (LF-EM) radiation on plants. The response of plants to LF-EM radiation often entails induction in the biosynthesis of secondary metabolites, a subject matter that is well documented. Nerium oleander is a Mediterranean plant species, which evolved remarkable resistance to various environmental stress conditions. In the current investigation, cultivated N. oleander plants, following their long-term exposure to LF-EM radiation, exhibited major structural modifications as the flattening of crypts, the elimination of trichomes and the reduction of the layers of the epidermal cells. These changes co-existed with an oxidative stress response manifested by a significant increase in reactive oxygen species at both the roots and the above ground parts, a decline in the absorbance of light by photosynthetic pigments and the substantially increased biosynthesis of L-Dopa decarboxylase (DDC), an enzyme catalyzing the production of secondary metabolites that alleviate stress. The exposed plants exhibited greater primary plant productivity, despite a manifested photosynthetic pigment limitation and the severe oxidative stress. This unique response of N. oleander to severe abiotic stress conditions may be owed to the advantage offered by a structural change consistent to an easier diffusion of CO2 within the leaves. A major plant response to an emerging "pollutant" was documented.
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Affiliation(s)
- Aikaterina L Stefi
- Section of Botany, Faculty of Biology, National and Kapodistrian University of Athens, 15701, Ilissia, Athens, Hellas, Greece
| | - Konstantina Mitsigiorgi
- Section of Botany, Faculty of Biology, National and Kapodistrian University of Athens, 15701, Ilissia, Athens, Hellas, Greece
| | - Dido Vassilacopoulou
- Section of Biochemistry and Molecular Biology, Faculty of Biology, National and Kapodistrian University of Athens, 15701, Ilissia, Athens, Hellas, Greece
| | - Nikolaos S Christodoulakis
- Section of Botany, Faculty of Biology, National and Kapodistrian University of Athens, 15701, Ilissia, Athens, Hellas, Greece.
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11
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Stefi AL, Margaritis LH, Skouroliakou AS, Vassilacopoulou D. Mobile phone electromagnetic radiation affects Amyloid Precursor Protein and α-synuclein metabolism in SH-SY5Y cells. PATHOPHYSIOLOGY 2019; 26:203-212. [DOI: 10.1016/j.pathophys.2019.02.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 02/19/2019] [Accepted: 02/22/2019] [Indexed: 12/26/2022] Open
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12
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Litovchick L. Blocking of Immunoblots and Incubation with Antibodies: Procedure for Immunoblots Prepared with Whole-Cell Lysates or Purified Proteins. Cold Spring Harb Protoc 2019; 2019:2019/8/pdb.prot098467. [PMID: 31371473 DOI: 10.1101/pdb.prot098467] [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: 06/10/2023]
Abstract
In this protocol, immunoblots are prepared for detection of the proteins of interest by incubation with blocking solution to prevent nonspecific antibody binding, followed by incubation with primary and secondary antibodies. When labeled primary antibody is used, incubation with secondary antibodies can be omitted.
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Wang S, Wang X, Tang S, Chen Y, Jia J, Chen J, Shen H, Bai B. A Study of Immunochromatographic Fecal Occult Blood Test Methods. Lab Med 2019; 50:130-137. [PMID: 30169856 DOI: 10.1093/labmed/lmy057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND The sensitivity of the commonly used immunochromatographic fecal occult blood test (iFOBT) is critical in the routine screening of digestive tract cancers. OBJECTIVE To determine whether the performance of the iFOBT might be improved by optimizing detergents and buffers in stool solution. METHODS We tested different buffers and detergents in stool solution. The specificity of the new solution condition was confirmed by dot immunoblotting. A total of 1122 clinical stool specimens were collected to evaluate the clinical application of this refined stool solution. RESULTS The different salts exerted minor effects; also, sodium dodecyl sulfate (SDS) prevented the test from working as designed. However, 1% Triton X-100 improved the sensitivity significantly, as confirmed by dot immunoblot testing. With 1% Triton X-100 in the stool solution, the rate of positive iFOBT results in patients with digestive tract cancers increased, from 40.4% to 49.4%. CONCLUSION Use of 1% Triton X-100 improves the sensitivity of the iFOBT and thus, this substance should be routinely included in iFOBT for screening of digestive tract cancers.
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Affiliation(s)
- Sen Wang
- Department of Laboratory Medicine, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Xian Wang
- Department of Laboratory Medicine, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Shengnan Tang
- Department of Laboratory Medicine, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Yuxin Chen
- Department of Laboratory Medicine, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Jia Jia
- Department of Laboratory Medicine, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Junhao Chen
- Department of Laboratory Medicine, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Han Shen
- Department of Laboratory Medicine, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, Jiangsu, China
| | - Bing Bai
- Department of Laboratory Medicine, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, Jiangsu, China
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14
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Vassiliou AG, Floros G, Jahaj E, Stamogiannos G, Gennimata S, Vassiliadi DA, Tsagarakis S, Tzanela M, Ilias I, Orfanos SE, Kotanidou A, Dimopoulou I. Decreased glucocorticoid receptor expression during critical illness. Eur J Clin Invest 2019; 49:e13073. [PMID: 30703253 DOI: 10.1111/eci.13073] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 09/27/2018] [Accepted: 01/01/2019] [Indexed: 01/07/2023]
Abstract
INTRODUCTION In critically ill patients, the hypothalamic-pituitary-adrenal axis is activated, resulting in increased serum cortisol concentrations. However, in some patients, especially those with sepsis, cortisol levels are relatively low for the degree of illness severity. Therefore, in the present project, we aim to characterize the time course of glucocorticoid receptor (GCR) alpha and beta expression in peripheral polymorphonuclear cells of critically ill septic or nonseptic patients using real-time PCR. DESIGN A prospective observational study conducted on 32 critically ill adults not receiving steroids, in a university-affiliated, multidisciplinary intensive care unit (ICU). Blood samples were collected for measurement of glucocorticoid receptor expression within 24-48 hours of admission to the ICU and at days 4, 8 and 13 after admission, reflecting the acute and chronic phase of the illness. RESULTS During ICU stay, patients expressed over time reduced levels of both GCR-α and GCR-β mRNA. More specifically, GCR-α mRNA expression was decreased fourfold 4 days after admission (P < 0.0001) and remained low up to 2 weeks after admission (P < 0.001). On the other hand, GCR-β mRNA levels remained stable shortly after admission, but approx. one week after admission, its levels decreased threefold (P < 0.01) and remained reduced up to 2 weeks after admission (P < 0.001). DISCUSSION Our results suggest that critically ill patients have highly variable expression of alpha and beta GCR, and moreover, the levels of both receptors decrease during ICU stay. Taken together, these might explain the differential responsiveness of patients to exogenous steroid administration or to endogenous cortisol secretion.
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Affiliation(s)
- Alice G Vassiliou
- 1st Department of Critical Care Medicine & Pulmonary Services, GP Livanos and M Simou Laboratories, Evangelismos Hospital, Athens Medical School, National & Kapodistrian University of Athens, Athens, Greece
| | - Georgios Floros
- 1st Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, Athens Medical School, National & Kapodistrian University of Athens, Athens, Greece
| | - Edison Jahaj
- 1st Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, Athens Medical School, National & Kapodistrian University of Athens, Athens, Greece
| | - Georgios Stamogiannos
- 1st Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, Athens Medical School, National & Kapodistrian University of Athens, Athens, Greece
| | - Sofianna Gennimata
- 1st Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, Athens Medical School, National & Kapodistrian University of Athens, Athens, Greece
| | - Dimitra A Vassiliadi
- Department of Endocrinology, Diabetes and Metabolism, Evangelismos Hospital, Athens, Greece
| | - Stylianos Tsagarakis
- Department of Endocrinology, Diabetes and Metabolism, Evangelismos Hospital, Athens, Greece
| | - Marinella Tzanela
- Department of Endocrinology, Diabetes and Metabolism, Evangelismos Hospital, Athens, Greece
| | - Ioannis Ilias
- Endocrine Unit, Elena Venizelou Hospital, Athens, Greece
| | - Stylianos E Orfanos
- 1st Department of Critical Care Medicine & Pulmonary Services, GP Livanos and M Simou Laboratories, Evangelismos Hospital, Athens Medical School, National & Kapodistrian University of Athens, Athens, Greece.,1st Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, Athens Medical School, National & Kapodistrian University of Athens, Athens, Greece
| | - Anastasia Kotanidou
- 1st Department of Critical Care Medicine & Pulmonary Services, GP Livanos and M Simou Laboratories, Evangelismos Hospital, Athens Medical School, National & Kapodistrian University of Athens, Athens, Greece.,1st Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, Athens Medical School, National & Kapodistrian University of Athens, Athens, Greece
| | - Ioanna Dimopoulou
- 1st Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, Athens Medical School, National & Kapodistrian University of Athens, Athens, Greece
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15
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Dielectrophoresis-based filtration effect and detection of amyloid beta in plasma for Alzheimer's disease diagnosis. Biosens Bioelectron 2019; 128:166-175. [DOI: 10.1016/j.bios.2018.12.046] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 12/13/2018] [Accepted: 12/21/2018] [Indexed: 12/15/2022]
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16
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Vassiliou AG, Siaterli MZ, Frakolaki E, Gkogkosi P, Paspaltsis I, Sklaviadis T, Vassilacopoulou D, Vassilaki N. L-Dopa decarboxylase interaction with the major signaling regulator ΡΙ3Κ in tissues and cells of neural and peripheral origin. Biochimie 2019; 160:76-87. [PMID: 30796964 DOI: 10.1016/j.biochi.2019.02.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 02/17/2019] [Indexed: 12/17/2022]
Abstract
L-Dopa decarboxylase (DDC) catalyzes the decarboxylation of L-Dopa to dopamine and 5-hydroxytryptophan (5-HTP) to serotonin. Although DDC has been purified from a variety of peripheral organs, including the liver, kidney and pancreas, the physiological significance of the peripherally expressed enzyme is not yet fully understood. DDC has been considered as a potential novel biomarker for various types of cancer, however, the role of DDC in the development of hepatocellular carcinoma (HCC) remains to be evaluated. Phosphatidylinositol 3-kinase (PI3K), on the other hand, has been shown to play a key role in the tumorigenesis, proliferation, metastasis, apoptosis, and angiogenesis of HCC by regulating gene expression. We initially identified the interaction of DDC with PI3K by means of the phage display methodology. This association was further confirmed in human hepatocellular carcinoma cell lines, human embryonic kidney cells, human neuroblastoma cells, as well as mouse brain, by the use of specific antibodies raised against DDC and PI3K. Functional aspects of the above interaction were studied upon treatment with the DDC inhibitor carbidopa and the PI3K inhibitor LY294002. Interestingly, our data demonstrate the expression of the neuronal type DDC mRNA in HCC cells. The present investigation provides new evidence on the possible link of DDC with the PI3K pathway, underlining the biological significance of this complex enzyme.
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Affiliation(s)
- Alice G Vassiliou
- 1st Department of Critical Care Medicine & Pulmonary Services, GP Livanos and M Simou Laboratories, Evangelismos Hospital, Athens Medical School, National & Kapodistrian University of Athens, Ipsilantou 45-47, 10676, Athens, Greece; Section of Biochemistry and Molecular Biology, Faculty of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15701, Athens, Greece
| | - Maria-Zacharenia Siaterli
- Section of Biochemistry and Molecular Biology, Faculty of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15701, Athens, Greece
| | - Efseveia Frakolaki
- Molecular Virology Laboratory, Hellenic Pasteur Institute, 127 Vas. Sofias ave., 11521, Athens, Greece
| | - Panayiota Gkogkosi
- Section of Biochemistry and Molecular Biology, Faculty of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15701, Athens, Greece
| | - Ioannis Paspaltsis
- Laboratory of Pharmacology, School of Health Sciences, Department of Pharmacy, Aristotle University of Thessaloniki, University Campus, 54124, Thessaloniki, Greece
| | - Theodoros Sklaviadis
- Laboratory of Pharmacology, School of Health Sciences, Department of Pharmacy, Aristotle University of Thessaloniki, University Campus, 54124, Thessaloniki, Greece
| | - Dido Vassilacopoulou
- Section of Biochemistry and Molecular Biology, Faculty of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15701, Athens, Greece.
| | - Niki Vassilaki
- Molecular Virology Laboratory, Hellenic Pasteur Institute, 127 Vas. Sofias ave., 11521, Athens, Greece.
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17
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Poonsuk K, Giménez-Lirola LG, Magtoto RL, Ji J, Baum DH, Rademacher CJ, Brown JT, Zhang J, Wang C, Main RG, Zimmerman JJ. The effect of chemical clarification of oral fluids on porcine epidemic diarrhea virus antibody responses. J Vet Diagn Invest 2018; 30:937-941. [PMID: 30204059 DOI: 10.1177/1040638718798672] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Routine testing of breeding herd oral fluid (OF) samples for porcine epidemic diarrhea virus (PEDV) IgG and/or IgA is used to track levels of PEDV immunity over time. However, OFs contain particles of feed, feces, and inorganic material that detract from the quality of the sample. We clarified swine OF samples using lyophilized chitosan-based formulas (A-C) tested by PEDV IgG and IgA ELISAs. To evaluate both the immediate and residual effects of treatment on antibody detection, samples were tested immediately post-treatment, then stored at 4°C and retested at 2, 4, and 6 days post-treatment (DPT). Formulations were shown to effectively clarify samples. Statistical analysis comparing treated to untreated OF samples at 0 DPT found that neither chitosan nor Tween 20 affected the OF ELISA IgA and IgG sample-to-positive (S/P) ratio results ( p > 0.05). Furthermore, pairwise comparisons of 0 DPT to 2, 4, and 6 DPT results detected no significant differences ( p > 0.05) in IgA and IgG S/P ratios (i.e., treated OF samples were stable over time). Therefore, chitosan efficiently clarified OF specimens without affecting the results of the PEDV IgG and IgA antibody ELISAs.
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Affiliation(s)
- Korakrit Poonsuk
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine (Poonsuk, Giménez-Lirola, Magtoto, Baum, Rademacher, Brown, Zhang, Main, Zimmerman), Iowa State University, Ames, IA.,Department of Statistics, College of Liberal Arts and Sciences (Ji, Wang), Iowa State University, Ames, IA
| | - Luis G Giménez-Lirola
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine (Poonsuk, Giménez-Lirola, Magtoto, Baum, Rademacher, Brown, Zhang, Main, Zimmerman), Iowa State University, Ames, IA.,Department of Statistics, College of Liberal Arts and Sciences (Ji, Wang), Iowa State University, Ames, IA
| | - Ronaldo L Magtoto
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine (Poonsuk, Giménez-Lirola, Magtoto, Baum, Rademacher, Brown, Zhang, Main, Zimmerman), Iowa State University, Ames, IA.,Department of Statistics, College of Liberal Arts and Sciences (Ji, Wang), Iowa State University, Ames, IA
| | - Ju Ji
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine (Poonsuk, Giménez-Lirola, Magtoto, Baum, Rademacher, Brown, Zhang, Main, Zimmerman), Iowa State University, Ames, IA.,Department of Statistics, College of Liberal Arts and Sciences (Ji, Wang), Iowa State University, Ames, IA
| | - David H Baum
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine (Poonsuk, Giménez-Lirola, Magtoto, Baum, Rademacher, Brown, Zhang, Main, Zimmerman), Iowa State University, Ames, IA.,Department of Statistics, College of Liberal Arts and Sciences (Ji, Wang), Iowa State University, Ames, IA
| | - Christopher J Rademacher
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine (Poonsuk, Giménez-Lirola, Magtoto, Baum, Rademacher, Brown, Zhang, Main, Zimmerman), Iowa State University, Ames, IA.,Department of Statistics, College of Liberal Arts and Sciences (Ji, Wang), Iowa State University, Ames, IA
| | - Justin T Brown
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine (Poonsuk, Giménez-Lirola, Magtoto, Baum, Rademacher, Brown, Zhang, Main, Zimmerman), Iowa State University, Ames, IA.,Department of Statistics, College of Liberal Arts and Sciences (Ji, Wang), Iowa State University, Ames, IA
| | - Jianqiang Zhang
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine (Poonsuk, Giménez-Lirola, Magtoto, Baum, Rademacher, Brown, Zhang, Main, Zimmerman), Iowa State University, Ames, IA.,Department of Statistics, College of Liberal Arts and Sciences (Ji, Wang), Iowa State University, Ames, IA
| | - Chong Wang
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine (Poonsuk, Giménez-Lirola, Magtoto, Baum, Rademacher, Brown, Zhang, Main, Zimmerman), Iowa State University, Ames, IA.,Department of Statistics, College of Liberal Arts and Sciences (Ji, Wang), Iowa State University, Ames, IA
| | - Rodger G Main
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine (Poonsuk, Giménez-Lirola, Magtoto, Baum, Rademacher, Brown, Zhang, Main, Zimmerman), Iowa State University, Ames, IA.,Department of Statistics, College of Liberal Arts and Sciences (Ji, Wang), Iowa State University, Ames, IA
| | - Jeffrey J Zimmerman
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine (Poonsuk, Giménez-Lirola, Magtoto, Baum, Rademacher, Brown, Zhang, Main, Zimmerman), Iowa State University, Ames, IA.,Department of Statistics, College of Liberal Arts and Sciences (Ji, Wang), Iowa State University, Ames, IA
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18
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Vassiliou AG, Manitsopoulos N, Kardara M, Maniatis NA, Orfanos SE, Kotanidou A. Differential Expression of Aquaporins in Experimental Models of Acute Lung Injury. ACTA ACUST UNITED AC 2018; 31:885-894. [PMID: 28882955 DOI: 10.21873/invivo.11143] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 08/09/2017] [Accepted: 08/21/2017] [Indexed: 12/23/2022]
Abstract
AIM The mammalian lung expresses at least three aquaporin (AQP) water channels whose precise role in lung injury or inflammation is still controversial. MATERIALS AND METHODS Three murine models of lung inflammation and corresponding controls were used to evaluate the expression of Aqp1, Aqp4, Aqp5 and Aqp9: lipopolysaccharide (LPS)-induced lung injury; HCl-induced lung injury; and ventilation-induced lung injury (VILI). RESULTS All models yielded increased lung vascular permeability, and inflammatory cell infiltration in the broncho-alveolar lavage fluid; VILI additionally produced altered lung mechanics. Lung expression of Aqp4 decreased in the models that targeted primarily the alveolar epithelium, i.e. acid aspiration and mechanical ventilation, while Aqp5 expression decreased in the model that appeared to target both the capillary endothelium and alveolar epithelium, i.e. LPS. CONCLUSION Participation of aquaporins in the acute inflammatory process depends on localization and the type of lung injury.
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Affiliation(s)
- Alice G Vassiliou
- GP Livanos and M. Simou Laboratories, First Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, National and Kapodistrian University of Athens Medical School, Athens, Greece
| | - Nikolaos Manitsopoulos
- GP Livanos and M. Simou Laboratories, First Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, National and Kapodistrian University of Athens Medical School, Athens, Greece
| | - Matina Kardara
- GP Livanos and M. Simou Laboratories, First Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, National and Kapodistrian University of Athens Medical School, Athens, Greece
| | - Nikolaos A Maniatis
- GP Livanos and M. Simou Laboratories, First Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, National and Kapodistrian University of Athens Medical School, Athens, Greece.,Second Department of Critical Care, Attikon Hospital, National and Kapodistrian University of Athens Medical School, Athens, Greece
| | - Stylianos E Orfanos
- GP Livanos and M. Simou Laboratories, First Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, National and Kapodistrian University of Athens Medical School, Athens, Greece .,Second Department of Critical Care, Attikon Hospital, National and Kapodistrian University of Athens Medical School, Athens, Greece
| | - Anastasia Kotanidou
- GP Livanos and M. Simou Laboratories, First Department of Critical Care Medicine & Pulmonary Services, Evangelismos Hospital, National and Kapodistrian University of Athens Medical School, Athens, Greece.,First Department of Critical Care Medicine & Pulmonary Services, National and Kapodistrian University of Athens Medical School, Evangelismos Hospital, Athens, Greece
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19
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Immunological analysis of food proteins using high-performance thin-layer chromatography-immunostaining. J Chromatogr A 2017; 1526:157-166. [DOI: 10.1016/j.chroma.2017.10.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 10/17/2017] [Accepted: 10/19/2017] [Indexed: 11/22/2022]
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20
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Ezenarro JJ, Uria N, Castillo-Fernández Ó, Párraga N, Sabrià M, Muñoz Pascual FX. Development of an integrated method of concentration and immunodetection of bacteria. Anal Bioanal Chem 2017; 410:105-113. [PMID: 29063163 DOI: 10.1007/s00216-017-0695-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 09/07/2017] [Accepted: 10/06/2017] [Indexed: 11/27/2022]
Abstract
The microbial quality of water is a key aspect to avoid environmental and public health problems. The low pathogen concentration needed to produce a disease outbreak makes it essential to process large water volumes and use sensitive and specific methods such as immunoassays for its detection. In the present work, we describe the development of a device based on microfiltration membranes to integrate the concentration and the immunodetection of waterborne bacteria. A microfiltration membrane treatment protocol was designed to reduce the non-specific binding of antibodies, for which different blocking agents were tested. Thus, the proof of concept of the microbial detection system was also carried out using Escherichia coli as the bacterial pathogen model. E. coli suspensions were filtered through the membranes at 0.5 mL s-1, and the E. coli concentration measurements were made by absorbance, at 620 nm, of the resultant product of the enzymatic reaction among the horseradish peroxidase (HRP) bonded to the antibody, and the substrate 3,3',5,5'-tetramethylbenzidine (TMB). The results showed that the homemade concentration system together with the developed membrane treatment protocol is able to detect E. coli cells with a limit of detection (LoD) of about 100 CFU in 100 mL. Graphical abstract Scheme of the integrated method of concentration and immunodetection of bacteria.
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Affiliation(s)
- Josune J Ezenarro
- Institut de Microelectrònica de Barcelona, CNM-CSIC, Esfera UAB-CEI, Campus UAB, 08193, Bellaterra, Spain.
| | - Naroa Uria
- Institut de Microelectrònica de Barcelona, CNM-CSIC, Esfera UAB-CEI, Campus UAB, 08193, Bellaterra, Spain
| | - Óscar Castillo-Fernández
- Institut de Microelectrònica de Barcelona, CNM-CSIC, Esfera UAB-CEI, Campus UAB, 08193, Bellaterra, Spain
| | - Noemí Párraga
- Unitat de Malalties Infeccioses, Fundació Institut d'Investigació Germans Trias I Pujol, 08916, Badalona, Spain
- CIBER de Enfermedades Respiratorias, 28029, Madrid, Spain
| | - Miquel Sabrià
- CIBER de Enfermedades Respiratorias, 28029, Madrid, Spain
- Universitat Autònoma de Barcelona, 08193, Cerdanyola, Spain
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21
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Reynolds-Peterson CE, Zhao N, Xu J, Serman TM, Xu J, Selleck SB. Heparan sulfate proteoglycans regulate autophagy in Drosophila. Autophagy 2017; 13:1262-1279. [PMID: 28402693 PMCID: PMC5584867 DOI: 10.1080/15548627.2017.1304867] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Heparan sulfate-modified proteoglycans (HSPGs) are important regulators of signaling and molecular recognition at the cell surface and in the extracellular space. Disruption of HSPG core proteins, HS-synthesis, or HS-degradation can have profound effects on growth, patterning, and cell survival. The Drosophila neuromuscular junction provides a tractable model for understanding the activities of HSPGs at a synapse that displays developmental and activity-dependent plasticity. Muscle cell-specific knockdown of HS biosynthesis disrupted the organization of a specialized postsynaptic membrane, the subsynaptic reticulum (SSR), and affected the number and morphology of mitochondria. We provide evidence that these changes result from a dysregulation of macroautophagy (hereafter referred to as autophagy). Cellular and molecular markers of autophagy are all consistent with an increase in the levels of autophagy in the absence of normal HS-chain biosynthesis and modification. HS production is also required for normal levels of autophagy in the fat body, the central energy storage and nutritional sensing organ in Drosophila. Genetic mosaic analysis indicates that HS-dependent regulation of autophagy occurs non-cell autonomously, consistent with HSPGs influencing this cellular process via signaling in the extracellular space. These findings demonstrate that HS biosynthesis has important regulatory effects on autophagy and that autophagy is critical for normal assembly of postsynaptic membrane specializations.
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Affiliation(s)
- Claire E Reynolds-Peterson
- a Department of Biochemistry and Molecular Biology , The Pennsylvania State University , University Park , PA , USA
| | - Na Zhao
- a Department of Biochemistry and Molecular Biology , The Pennsylvania State University , University Park , PA , USA
| | - Jie Xu
- a Department of Biochemistry and Molecular Biology , The Pennsylvania State University , University Park , PA , USA
| | - Taryn M Serman
- a Department of Biochemistry and Molecular Biology , The Pennsylvania State University , University Park , PA , USA
| | - Jielin Xu
- a Department of Biochemistry and Molecular Biology , The Pennsylvania State University , University Park , PA , USA
| | - Scott B Selleck
- a Department of Biochemistry and Molecular Biology , The Pennsylvania State University , University Park , PA , USA
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22
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Abstract
Clinical and environmental analyses frequently necessitate rapid, simple, and inexpensive point-of-care or field tests. These semiquantitative tests may be later followed up by confirmatory laboratory-based assays, but provide an initial scenario assessment important for resource mobilization and threat confinement. Lateral-flow assays (LFAs) and dip-stick assays, which are typically antibody-based and yield a visually detectable signal, provide an assay format suiting these applications extremely well. Signal generation is commonly obtained through the use of colloidal gold or latex beads, which yield a colored band either directly proportional or inversely proportional to the concentration of the analyte of interest. Here, dye-encapsulating liposomes as a highly visible alternative are discussed. The semiquantitative LFA biosensor described in this chapter relies on a sandwich immunoassay for the detection of myoglobin in whole blood. After an acute myocardial infarction (AMI) event, several cardiac markers are released into the blood, the most common of which are troponin, creatine kinase MB, C-reactive protein, and myoglobin. Due to its early release, myoglobin has value as an indicator of a recent heart attack amongst conditions which present with similar symptoms and its lack of elevation can effectively rule out a heart attack (Brogan et al., Ann Emerg Med 24:665-671, 1994). The assay described within relies on sandwich complex formation between a membrane immobilized capture monoclonal antibody against myoglobin, a detector biotinylated monoclonal antibody against a different epitope on myoglobin, and streptavidin-conjugated visible dye (sulforhodamine B)-encapsulating liposomes to allow for signal generation.
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Affiliation(s)
- Katie A Edwards
- Department of Biological and Environmental Engineering, Cornell University, 140 Riley-Robb Hall, Ithaca, NY, 14853, USA
| | - Ricki Korff
- Department of Biological and Environmental Engineering, Cornell University, 140 Riley-Robb Hall, Ithaca, NY, 14853, USA
| | - Antje J Baeumner
- Department of Biological and Environmental Engineering, Cornell University, 140 Riley-Robb Hall, Ithaca, NY, 14853, USA.
- Institute for Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040, Regensburg, Germany.
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23
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Hong S, Kwak R, Kim W. Paper-Based Flow Fractionation System Applicable to Preconcentration and Field-Flow Separation. Anal Chem 2016; 88:1682-7. [DOI: 10.1021/acs.analchem.5b03682] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Seokbin Hong
- Department
of Mechanical Engineering, Sogang University, Seoul, 121-742, Republic of Korea
| | - Rhokyun Kwak
- Center
for BioMicrosystems, Korea Institute of Science and Technology, Seoul, 136-791, Republic of Korea
| | - Wonjung Kim
- Department
of Mechanical Engineering, Sogang University, Seoul, 121-742, Republic of Korea
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24
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Papadopoulos EI, Yousef GM, Scorilas A. Gemcitabine impacts differentially on bladder and kidney cancer cells: distinct modulations in the expression patterns of apoptosis-related microRNAs and BCL2 family genes. Tumour Biol 2015; 36:3197-207. [PMID: 25833690 DOI: 10.1007/s13277-014-2190-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2014] [Accepted: 06/03/2014] [Indexed: 12/22/2022] Open
Abstract
Bladder and renal cancer are two representative cases of tumors that respond differentially to gemcitabine. Previous studies have shown that gemcitabine can trigger apoptosis in various cancer cells. Herein, we sought to investigate the impact of gemcitabine on the expression levels of the BCL2 family members BCL2, BAX, and BCL2L12 and the apoptosis-related microRNAs miR-182, miR-96, miR-145, and miR-16 in the human bladder and kidney cancer cell lines T24 and Caki-1, respectively. Cancer cells' viability as well as the IC50 doses of gemcitabine were estimated by the MTT assay, while the detection of cleaved PARP via Western blotting was used as an indicator of apoptosis. Furthermore, T24 and Caki-1 cells' ability to recover from treatment was also monitored. Two different highly sensitive quantitative real-time RT-PCR methodologies were developed in order to assess the expression levels of BCL2 family genes and microRNAs. Exposure of cancer cells to gemcitabine produced the IC50 values of 30 and 3 nM for Caki-1 and T24 cells, correspondingly, while cleaved PARP was detected only in Caki-1 cells. T24 cells demonstrated the ability to recover from gemcitabine treatment, whereas Caki-1 cells' recovery capability was dependent on the initial time of exposure. BCL2 and BAX were significantly modulated in treated Caki-1 cells. Instead, T24 cells exhibited alterations only in the latter, as well as in all studied microRNAs. Therefore, according to our data, bladder and renal cancer cells' response to gemcitabine is accompanied by distinct alterations in the expression levels of their apoptosis-related genes and microRNAs.
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Affiliation(s)
- Emmanuel I Papadopoulos
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Athens, Panepistimiopolis, Athens, 15701, Greece
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25
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Sharma A, Hong S, Singh R, Jang J. Single-walled carbon nanotube based transparent immunosensor for detection of a prostate cancer biomarker osteopontin. Anal Chim Acta 2015; 869:68-73. [PMID: 25818141 DOI: 10.1016/j.aca.2015.02.010] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Revised: 12/29/2014] [Accepted: 02/06/2015] [Indexed: 12/12/2022]
Abstract
Osteopontin (OPN) is involved in almost all steps of cancer development, and it is being investigated as a potential biomarker for a diagnosis and prognosis of prostate cancer. Here, we report a label-free, highly sensitive and transparent immunosensor based on single-walled carbon nanotubes (SWCNTs) for detection of OPN. A high density of COOH functionalized SWCNTs was deposited between two gold/indium tin oxide electrodes on a glass substrate by dielectrophoresis. Monoclonal antibodies specific to OPN were covalently immobilized on the SWCNTs. Relative resistance change of the immunosensors was measured as the concentration of OPN in phosphate buffer saline (PBS) and human serum was varied from 1 pg mL(-1) to 1 μg mL(-1) for different channel lengths of 2, 5, and 10 μm, showing a highly linear and reproducible behavior (R(2)>97%). These immunosensors were also specific to OPN against another test protein, bovine serum albumin, PBS and human serum, showing that a limit of detection for OPN was 0.3 pg mL(-1). This highly sensitive and transparent immunosensor has a great potential as a simple point-of-care test kit for various protein biomarkers.
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Affiliation(s)
- Abhinav Sharma
- School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea
| | - Seongkyeol Hong
- School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea
| | - Renu Singh
- School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea
| | - Jaesung Jang
- School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea; Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea; School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea.
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26
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Papadopoulos EI, Yousef GM, Scorilas A. Cytotoxic activity of sunitinib and everolimus in Caki-1 renal cancer cells is accompanied by modulations in the expression of apoptosis-related microRNA clusters and BCL2 family genes. Biomed Pharmacother 2015; 70:33-40. [PMID: 25776476 DOI: 10.1016/j.biopha.2014.12.043] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 12/30/2014] [Indexed: 01/02/2023] Open
Abstract
Sunitinib and everolimus are two of the antineoplastic agents indicated for the management of metastatic renal cancer. Although both of the above compounds were primarily designed as antiangiogenic factors, preclinical studies claim that these drugs can also trigger apoptosis. Herein, we sought to evaluate the cytotoxic activity of sunitinib and everolimus against renal cancer cells Caki-1 and moreover to assess their impact on the expression levels of three BCL2 family members and three apoptosis-related microRNA clusters upon incubation with the drugs or following recovery from treatment. The cytotoxic effect of sunitinib and everolimus on Caki-1 cells' viability was estimated by the MTT assay, while cleaved PARP, assayed via Western Blotting, served as a marker of programmed cell death. As for the expression levels of the BCL2 family members BCL2, BAX and BCL2L12 and those of the mature microRNAs of the miR-183/96/182, miR-143/145, and miR-15a/16 clusters, they were quantified via real-time PCR. Our results showed that both agents induced a time- and dose-dependent decrease in cell viability and promoted cleavage of PARP. In parallel, significant modulations were observed in the expression levels of miR-145, miR-15a, and miR-16 in case of sunitinib, whereas BCL2, BAX, miR-145 and miR-15a expression was strongly affected by everolimus. Overall, our data support the notion that sunitinib and everolimus are able to directly induce cell death in renal cancer cells and simultaneously affect the expression levels of their apoptosis-related microRNAs and BCL2 family members upon this process.
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Affiliation(s)
- Emmanuel I Papadopoulos
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Athens, Panepistimiopolis, Athens 15701, Greece
| | - George M Yousef
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Andreas Scorilas
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Athens, Panepistimiopolis, Athens 15701, Greece.
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Abstract
Several techniques have been employed to detect proteins on membranes. These include the use of quantum dot luminescent labels, oxyblot immunochemical detection, polymer immunocomplexes, "coupled" probing approach, in situ renaturation of proteins for detecting enzyme activities in crude or purified preparations, immunochromatographic assay, western-phosphatase assay, and use of Congo red dye (a cosmetic color named Alta), Pro-Q Emerald 488 dye, or amine-reactive dye in combination with alkaline phosphatase- and horseradish peroxidase-antibody conjugates for the simultaneous trichromatic fluorescence detection of proteins. Several methods have been used to improve the detection of proteins on membranes, including glutaraldehyde treatment of nitrocellulose blots, elimination of keratin artifacts in immunoblots probed with polyclonal antibodies, and washing of immunoblots with excessive water and manipulation of Tween-20 in wash buffer. These methods are briefly reviewed in this chapter.
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Affiliation(s)
- Biji T Kurien
- Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA,
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Papadopoulos EI, Fragoulis EG, Scorilas A. Human l-DOPA decarboxylase mRNA is a target of miR-145: A prediction to validation workflow. Gene 2015; 554:174-80. [DOI: 10.1016/j.gene.2014.10.043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 10/16/2014] [Accepted: 10/25/2014] [Indexed: 12/23/2022]
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Fukuta M, Zheng B, Uenuma M, Okamoto N, Uraoka Y, Yamashita I, Watanabe H. Controlled charged amino acids of Ti-binding peptide for surfactant-free selective adsorption. Colloids Surf B Biointerfaces 2014; 118:25-30. [PMID: 24727527 DOI: 10.1016/j.colsurfb.2014.03.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 03/15/2014] [Accepted: 03/15/2014] [Indexed: 11/17/2022]
Abstract
The adsorption mechanism of titanium-binding peptide (TBP) on metal oxide substrates was investigated by evaluating the adsorption behavior of ferritins with various alanine-substituted TBPs. Results revealed that (a) a positively charged amino acid, lysine (K) or arginine (R), in TBP can anchor ferritin to negative zeta-potential substrates, (b) the adsorption force of K is stronger than R, and (c) local electrostatic interactions and flexibility of TBP directly affect adsorption. Based on these findings, selective ferritin adsorption on SiO2 with TiOX patterned surfaces in a surfactant-free condition was demonstrated. Alanine-substituted TBP with one positively charged amino acid (K) and one negatively charged amino acid (D), achieved ferritin-selective adsorption without a surfactant. The importance of controlled electrostatic forces between TBP and a substrate for selective adsorption without a surfactant was clearly demonstrated.
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Affiliation(s)
- Megumi Fukuta
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; Japan Science and Technology Agency, CREST, 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan.
| | - Bin Zheng
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan; Japan Science and Technology Agency, CREST, 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
| | - Mutsunori Uenuma
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan; Japan Science and Technology Agency, CREST, 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
| | - Naofumi Okamoto
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
| | - Yukiharu Uraoka
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan; Japan Science and Technology Agency, CREST, 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
| | - Ichiro Yamashita
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan; Japan Science and Technology Agency, CREST, 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
| | - Heiji Watanabe
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; Japan Science and Technology Agency, CREST, 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
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Vassiliou AG, Maniatis NA, Orfanos SE, Mastora Z, Jahaj E, Paparountas T, Armaganidis A, Roussos C, Aidinis V, Kotanidou A. Induced expression and functional effects of aquaporin-1 in human leukocytes in sepsis. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2013; 17:R199. [PMID: 24028651 PMCID: PMC4056620 DOI: 10.1186/cc12893] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Accepted: 07/23/2013] [Indexed: 12/22/2022]
Abstract
Introduction Gene expression profiling was performed via DNA microarrays in leukocytes from critically ill trauma patients nonseptic upon admission to the ICU, who subsequently developed either sepsis (n = 2) or severe sepsis and acute respiratory distress syndrome (n = 3). By comparing our results with published expression profiling studies in animal models of sepsis and lung injury, we found aquaporin-1 to be differentially expressed across all studies. Our aim was to determine how the water channel aquaporin-1 is involved in regulating the immune response in critically ill patients during infection acquired in the ICU. Methods Following the results of the initial genetic screening study, we prospectively followed aquaporin-1 leukocyte expression patterns in patients with ICU-acquired sepsis who subsequently developed septic shock (n = 16) versus critically ill patients who were discharged without developing sepsis (n = 13). We additionally determined aquaporin-1 expression upon lipopolysaccharide (LPS) exposure and explored functional effects of aquaporin-1 induction in polymorphonuclear granulocytes (PMNs). Results Leukocyte aquaporin-1 expression was induced at the onset of sepsis (median 1.71-fold increase; interquartile range: 0.99 to 2.42, P = 0.012 from baseline) and was further increased upon septic shock (median 3.00-fold increase; interquartile range: 1.20 to 5.40, P = 0.023 from sepsis, Wilcoxon signed-rank test); no difference was observed between baseline and discharge in patients who did not develop sepsis. Stimulation of PMNs by LPS led to increased expression of aquaporin-1 in vitro, which could be abrogated by the NF-κB inhibitor EF-24. PMN hypotonic challenge resulted in a transient increase of the relative cell volume, which returned to baseline after 600 seconds, while incubation in the presence of LPS resulted in persistently increased cell volume. The latter could be abolished by blocking aquaporin-1 with mercury and restored by incubation in β-mercaptoethanol, which abrogated the action of mercury inhibition. Conclusions Aquaporin-1 is induced in leukocytes of patients with ICU-acquired sepsis and exhibits higher expression in septic shock. This phenomenon may be due to LPS-triggered NF-κB activation that can also lead to alterations in plasma membrane permeability.
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Zhang H, Xu G, Liu T, Xu L, Zhou Y. Foam and interfacial properties of Tween 20–bovine serum albumin systems. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2012.10.028] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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l-Dopa decarboxylase (DDC) constitutes an emerging biomarker in predicting patients’ survival with stomach adenocarcinomas. J Cancer Res Clin Oncol 2012; 139:297-306. [DOI: 10.1007/s00432-012-1326-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Accepted: 09/24/2012] [Indexed: 01/26/2023]
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Kurihara Y, Takama M, Sekiya T, Yoshihara Y, Ooya T, Takeuchi T. Fabrication of carboxylated silicon nitride sensor chips for detection of antigen-antibody reaction using microfluidic reflectometric interference spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:13609-13615. [PMID: 22966896 DOI: 10.1021/la302221y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In this study, we report label-free detection of alpha-fetoprotein (AFP), which has been used as a biomarker for hepatocellular carcinoma, by a microfluidic reflectometric interference spectroscopy (RIfS) system adopting a simple halogen light source and an inexpensive silicon-based sensor chip. Introduction of carboxy groups on a silicon nitride sensor chip to immobilize anti-AFP monoclonal antibody (anti-AFP) was carried out simply by immersion in aqueous solution containing triethoxysilylpropylmaleamic acid bearing a carboxy group and a silanol group. The RIfS system with the anti-AFP-immobilized sensor chip was found to give a reversible response through 100 on/off cycles using a regeneration buffer with high reproducibility (coefficient of variation (CV) = 5.7%). The limit of detection (LOD) of AFP was 100 ng mL(-1), and the measurement range spanned 3 orders of magnitude. Furthermore, the sensor chip showed no cross-reactivity with human serum albumin, Immunoglobulin G, transferrin, or fibrinogen at 100 μg mL(-1) without the use of blocking reagents such as bovine serum albumin. Consequently, the proposed RIfS system is a potentially effective tool for biomarker detection and in vitro diagnostics.
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Affiliation(s)
- Yoshikazu Kurihara
- Graduate School of Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
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Fuchiwaki Y, Yasuzawa M. Immunosensor Accuracy Improved by Coating Beads with Poly-2-[3-(Methacryloylamino)Propylammonio]Ethyl 3-Aminopropyl Phosphate. ANAL LETT 2012. [DOI: 10.1080/00032719.2011.633180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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35
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Blancher C, Cormick RM. Sodium dodecyl sulphate-polyacrylamide denaturing gel electrophoresis and Western blotting techniques. Methods Mol Biol 2012; 878:89-110. [PMID: 22674128 DOI: 10.1007/978-1-61779-854-2_6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The study of proteins, their expression and post-translational modification, is a key process in molecular biology. Immunoblotting is a well-established and powerful tool for the study of proteins, which continues to evolve as new reagents and apparatus are developed. This chapter describes in detail the process by which proteins are extracted from cells, quantified, fractionated using poly-acrylamide gel electrophoresis, transferred to a membrane, and assessed by immunoblotting. Variations in experimental technique, and new technologies available to the researcher, are also discussed.
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Aliño VJ, Pang J, Yang KL. Liquid crystal droplets as a hosting and sensing platform for developing immunoassays. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:11784-11789. [PMID: 21863867 DOI: 10.1021/la2022215] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this paper, we report an immunoassay in which probe proteins are immobilized on the surface of liquid crystal (LC) droplets rather than on solid surfaces. The advantage of this immunoassay is that the binding of antibodies to the probe proteins can be transduced by the LC droplets directly without the need for additional steps. For example, when we incubate the LC droplets decorated with immunoglobulin G (IgG) in a solution containing anti-IgG (AIgG), these droplets change their orientations from radial to bipolar configuration. In contrast, when we incubate the IgG-LC droplets in a solution containing anti-human serum albumin (AHSA), no changes are observed. The change of orientational configuration indicates the formation of the antigen-antibody immunocomplex on the surface of the LC droplets. Using LC droplet immunoassays, we successfully detect antibody concentrations as low as 0.01 μg/mL for AIgG and 0.02 μg/mL for AHSA. Because the immunoassay using LC droplets is label-free and gives a unique optical response, it has the potential to be further developed as a portable and low-cost immunoassay.
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Affiliation(s)
- Vera Joanne Aliño
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576, Singapore
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Chalatsa I, Fragoulis EG, Vassilacopoulou D. Release of membrane-associated L-dopa decarboxylase from human cells. Neurochem Res 2011; 36:1426-34. [PMID: 21479916 DOI: 10.1007/s11064-011-0468-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/30/2011] [Indexed: 02/06/2023]
Abstract
L-Dopa Decarboxylase is a pyridoxal 5-phosphate (PLP)-dependent enzyme that catalyses the decarboxylation of L-Dopa to dopamine. In this study, we investigated the cellular topology of the active human enzyme. Fractionation of membranes from human cell lines, of neural and non-neural origin, by temperature-induced phase separation in Triton X-114 resulted in the detection of DDC molecules in all separation phases. Solubilization of membrane-associated DDC was observed in a pH and time-dependent manner and was affected by divalent cations and protease inhibitors, suggesting the involvement of a possible release mechanism. The study of the biological properties and function of the solubilization phenomenon described here, as well as, the study of the membrane-associated enzyme could provide us with new information about the participation of the human L-Dopa decarboxylase in physiological and aberrant processes.
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Affiliation(s)
- Ioanna Chalatsa
- Department of Biochemistry and Molecular Biology, University of Athens, Panepistimiopolis, Zografou, 15701, Athens, Greece
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38
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Aliño VJ, Yang KL. Using liquid crystals as a readout system in urinary albumin assays. Analyst 2011; 136:3307-13. [DOI: 10.1039/c1an15143f] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Siverio F, Cambra M, Gorris MT, Corzo J, Lopez MM. Lipopolysaccharides as Determinants of Serological Variability in Pseudomonas corrugata. Appl Environ Microbiol 2010; 59:1805-12. [PMID: 16348957 PMCID: PMC182165 DOI: 10.1128/aem.59.6.1805-1812.1993] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The variation in biochemical and serological features of 128 isolates of Pseudomonas corrugata has been studied with 56 isolates from Spain and 72 isolates from other countries. Isolates were analyzed with common diagnostic tests and with the AP150CHE system. Variability among isolates for some standard tests usually listed as positive or negative for this species, such as arginine dihydrolase and gelatin hydrolysis, lipase and lecithinase activities, pigment production, and wrinkled colony morphology, was observed. Three antisera were raised against the type strain and two Spanish isolates from tomato and pepper plants. Serological reactions were studied by indirect immunofluorescence and indirect enzyme-linked immunosorbent assay. Eighty-three isolates reacted with a single antiserum, 6 reacted with two antisera, and none reacted with three antisera. Thirty-nine isolates did not react with any of the three antisera. These results suggest that serology will not be a useful method for routine diagnosis of P. corrugata unless common antigens can be identified. Electrophoresis and immunoelectrotransfer were used to study the antigens involved. Each antiserum reacted with whole-cell lysates, giving two common bands for P. corrugata isolates and other Pseudomonas species and a ladder-like pattern characteristic of lipopolysaccharides (LPS). Common bands were not observed after proteinase K treatment. More than 10 LPS patterns were distinguished in 98 isolates after silver staining of polyacrylamide gels. There was no correlation between the geographical origin or host of the isolates and the LPS patterns. A correlation between LPS groups and serological reaction was observed.
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Affiliation(s)
- F Siverio
- Centro de Investigación y Tecnología Agraria, 38080 La Laguna, and Departamento de Bioquímica y Biología Molecular, Universidad de La Laguna, 38205 La Laguna, Tenerife, and Instituto Valenciano de Investigaciones Agrarias, 46113 Moncada, Valencia, Spain
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Rose NL, Sporns P, McMullen LM. Production of Antibodies against Enterocin B for Immunological Detection and Purification Purposes. FOOD AGR IMMUNOL 2010. [DOI: 10.1080/09540100120094492] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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Chalatsa I, Nikolouzou E, Fragoulis EG, Vassilacopoulou D. L-Dopa decarboxylase expression profile in human cancer cells. Mol Biol Rep 2010; 38:1005-11. [PMID: 20535562 DOI: 10.1007/s11033-010-0196-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2010] [Accepted: 05/22/2010] [Indexed: 02/06/2023]
Abstract
L-Dopa decarboxylase (DDC) catalyses the decarboxylation of L-Dopa. It has been shown that the DDC gene undergoes alternative splicing within its 5'-untranslated region (UTR), in a tissue-specific manner, generating identical protein products. The employment of two alternative 5'UTRs is thought to be responsible for tissue-specific expression of the human DDC mRNA. In this study, we focused on the investigation of the nature of the mRNA expression in human cell lines of neural and non-neural origin. Our results show the expression of a neural-type DDC mRNA splice variant, lacking exon 3 in all cell lines studied. Co-expression of the full length non-neural DDC mRNA and the neural-type DDC splice variant lacking exon 3 was detected in all cell lines. The alternative DDC protein isoform, Alt-DDC, was detected in SH-SY5Y and HeLa cells. Our findings suggest that the human DDC gene undergoes complex processing, leading to the formation of multiple mRNA isoforms. The study of the significance of this phenomenon of multiple DDC mRNA isoforms could provide us with new information leading to the elucidation of the complex biological pathways that the human enzyme is involved in.
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Affiliation(s)
- Ioanna Chalatsa
- Department of Biochemistry and Molecular Biology, University of Athens, Panepistimiopolis, Zografou, 15701, Athens, Greece
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42
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Luschtinetz F, Dosche C. Determination of micelle diffusion coefficients with fluorescence correlation spectroscopy (FCS). J Colloid Interface Sci 2009; 338:312-5. [DOI: 10.1016/j.jcis.2009.06.064] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2009] [Revised: 06/30/2009] [Accepted: 06/30/2009] [Indexed: 11/17/2022]
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Reduction of Non-Specific Protein Adsorption Using Poly(ethylene) Glycol (PEG) Modified Polyacrylate Hydrogels In Immunoassays for Staphylococcal Enterotoxin B Detection. SENSORS 2009; 9:645-55. [PMID: 22389622 PMCID: PMC3280768 DOI: 10.3390/s90100645] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2008] [Revised: 01/14/2009] [Accepted: 01/20/2009] [Indexed: 11/29/2022]
Abstract
Three PEG molecules (PEG-methacrylate, -diacrylate and -dimethacrylate) were incorporated into galactose-based polyacrylate hydrogels and their relative abilities to reduce non-specific protein adsorption in immunoassays were determined. Highly crosslinked hydrogels containing amine-terminated functionalities were formed and used to covalently attach antibodies specific for staphylococcal enterotoxin B (SEB). Patterned arrays of immobilized antibodies in the PEG-modified hydrogels were created with a PDMS template containing micro-channels for use in sandwich immunoassays to detect SEB. Different concentrations of the toxin were applied to the hydrogel arrays, followed with a Cy3-labeled tracer antibody specific for the two toxins. Fluorescence laser scanning confocal microscopy of the tracer molecules provided both qualitative and quantitative measurements on the detection sensitivity and the reduction in non-specific binding as a result of PEG incorporation. Results showed the PEG-modified hydrogel significantly reduced non-specific protein binding with a detection limit for SEB of 1 ng/mL. Fluorescence signals showed a 10-fold decrease in the non-specific binding and a 6-fold increase in specific binding of SEB.
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Edwards KA, Baeumner AJ. Liposome-enhanced lateral-flow assays for the sandwich-hybridization detection of RNA. Methods Mol Biol 2009; 504:185-215. [PMID: 19159099 DOI: 10.1007/978-1-60327-569-9_13] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Clinical and environmental analyses frequently necessitate rapid, simple, and inexpensive point-of-care or field tests. These semiquantitative tests may be later followed up by confirmatory laboratory-based assays, but can provide an initial scenario assessment important for resource mobilization and threat confinement. Lateral-flow assays (LFAs) and dip-stick assays, which are typically antibody-based and yield a visually detectable signal, provide an assay format suiting these applications extremely well. Signal generation is commonly obtained through the use of colloidal gold or latex beads, which yield a colored band either directly proportional or inversely proportional to the concentration of the analyte of interest. Here, dye-encapsulating liposomes as an alternative are discussed. The LFA biosensors described in this chapter rely on the sandwich-hybridization of a nucleic acid sequence-based amplified (NASBA) mRNA target between a membrane immobilized capture probe and a visible dye (sulforhodamine B)-encapsulating liposome conjugated reporter probe. Although the methodology of this chapter is focused on LFAs for the detection of RNA through sandwich hybridization, the information within can be readily adapted for sandwich and competitive immunoassays. Included are an introduction and application notes toward this end. These include notes ranging from the detection of nonamplified RNA and single-stranded DNA, conjugation protocols for antibodies and other proteins to liposomes, and universal assay formats.
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Affiliation(s)
- Katie A Edwards
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY, USA
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45
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Abstract
Several methods have been used for detecting proteins on membranes. These include the use of quantum dot luminescent labels, oxyblot immunochemical detection, polymer immunocomplexes, "coupled" probing approach, in situ renaturation of proteins for detecting enzyme activities in crude or purified preparations, immunochromatographic assay, western-phosphatase assay, and the use of Congo red dye, a cosmetic color named Alta, Pro-Q Emerald 488 dye, or amine-reactive dye in combination with alkaline phosphatase and horseradish peroxidase-antibody conjugates for the simultaneous trichromatic fluourescence detection of proteins. Several methods have been used to improve the detection of proteins on membranes, including glutaraldehyde treatment of nitrocellulose blots, elimination of keratin artifacts in immunoblots probed with polyclonal antibodies, and the washing of immunoblots with excessive water and manipulation of Tween-20 in wash buffer. These methods are briefly reviewed in this chapter.
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Kokkinou I, Nikolouzou E, Hatzimanolis A, Fragoulis EG, Vassilacopoulou D. Expression of enzymatically active L-DOPA decarboxylase in human peripheral leukocytes. Blood Cells Mol Dis 2008; 42:92-8. [PMID: 19041269 DOI: 10.1016/j.bcmd.2008.10.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Accepted: 10/21/2008] [Indexed: 11/19/2022]
Abstract
L-DOPA decarboxylase (DDC) is a pyridoxal 5-phosphate (PLP)-dependent enzyme that catalyses the decarboxylation of L-DOPA to dopamine. Dopamine (DA) has been found to be a regulating factor of the proliferation and differentiation of different leukocyte subtypes. In the present study, we report the expression of the gene that codes for the L-DOPA decarboxylase in human peripheral leukocytes and in T-lymphocytes, as well as the simultaneous detection of both neural and non-neural type DDC mRNA in the cellular components of this specialized connective tissue type. Furthermore, we have detected the neural type DDC transcript which lacks exon 3 and the alternative 37 kD alt-DDC protein isoform which lacks exons 10-15 but includes an alternative exon 10 in human peripheral leukocytes. Treatment of white blood cells with Triton X-114 resulted in the recovery of DDC in the detergent enriched and highly hydrophobic phases, suggesting association of DDC molecules with membranes in the studied cells. Enzymatic activity experiments revealed that DDC is active towards the decarboxylation of L-DOPA. The expression of enzymatically active DDC in human leukocytes could indicate a cross-talk between the nervous and the immune systems and raises new questions about the regulatory role of DDC in immune responses.
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Affiliation(s)
- Ioanna Kokkinou
- Department of Biochemistry-Molecular Biology, University of Athens, Athens, Greece
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Vassiliou AG, Fragoulis EG, Vassilacopoulou D. Detection, purification and identification of an endogenous inhibitor of L-Dopa decarboxylase activity from human placenta. Neurochem Res 2008; 34:1089-100. [PMID: 19005753 DOI: 10.1007/s11064-008-9879-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/23/2008] [Indexed: 01/01/2023]
Abstract
An endogenous inhibitor of L-Dopa decarboxylase activity was identified and purified from human placenta. The endogenous inhibitor of L-Dopa decarboxylase (Ddc) was localized in the membrane fraction of placental tissue. Treatment of membranes with phosphatidylinositol-specific phospholipase C or proteinase K did not affect membrane-associated Ddc inhibitory activity, suggesting that a population of the inhibitor is embedded within membranes. Purification was achieved by extraction from a nondenaturing polyacrylamide gel. The purification scheme resulted in the isolation of a single 35 kDa band, bearing L-Dopa decarboxylase inhibitory activity. The purified inhibitor was identified as Annexin V. The elucidation of the biological importance of the presence of an L-Dopa decarboxylase activity inhibitor in normal human tissues could provide us with new information leading to the better understanding of the biological pathways that Ddc is involved in.
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Wakayama J, Sekiguchi H, Akanuma S, Ohtani T, Sugiyama S. Methods for reducing nonspecific interaction in antibody–antigen assay via atomic force microscopy. Anal Biochem 2008; 380:51-8. [DOI: 10.1016/j.ab.2008.05.036] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2008] [Revised: 05/13/2008] [Accepted: 05/25/2008] [Indexed: 10/22/2022]
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Zachara NE, Cole RN, Hart GW, Gao Y. Detection and analysis of proteins modified by O-linked N-acetylglucosamine. ACTA ACUST UNITED AC 2008; Chapter 12:Unit 12.8. [PMID: 18429112 DOI: 10.1002/0471140864.ps1208s25] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
First, a protocol for increasing the stoichiometry of O-GlcNAc on proteins is given. This is followed by simple techniques for the detection/screening of O-GlcNAc-modified proteins either by immunoblotting or lectin affinity chromatography. Separate protocols verify that the glycan is O-linked GlcNAc. These methods are followed by protocols for more comprehensive analysis of O-GlcNAc modified proteins, including labeling of O-GlcNAc residues with [3H]Gal, and subsequent product analysis. The final two protocols assay for O-GlcNAc transferase and O-GlcNAcase activity, respectively.
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Affiliation(s)
- N E Zachara
- The Johns Hopkins University, Medical School, Baltimore, Maryland, USA
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Zachara NE, Hart GW, Cole RN, Gao Y. Detection and analysis of proteins modified by O-linked N-acetylglucosamine. ACTA ACUST UNITED AC 2008; Chapter 17:Unit 17.6. [PMID: 18265305 DOI: 10.1002/0471142727.mb1706s57] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The modification of Ser and Thr residues with O-linked b-N-acetyl glucosamine (O-GlcNAc) is a common and essential modification of nuclear and cytoplasmic proteins, and it is thought that O-GlcNAc performs a regulatory role in the cell. This unit concentrates on the techniques for the detection and analysis of proteins modified by O-GlcNAc as well as methods for the analysis of enzymes responsible for the addition and removal of this group.
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Affiliation(s)
- Natasha E Zachara
- The Johns Hopkins University Medical School, Baltimore, Maryland, USA
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