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Bundy J, Shaw J, Hammel M, Nguyen J, Robbins C, Mercier I, Suryanarayanan A. Role of β3 subunit of the GABA type A receptor in triple negative breast cancer proliferation, migration, and cell cycle progression. Cell Cycle 2024:1-18. [PMID: 38623967 DOI: 10.1080/15384101.2024.2340912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 02/29/2024] [Indexed: 04/17/2024] Open
Abstract
Triple negative breast cancer (TNBC) is known for its heterogeneous nature and aggressive onset. The unresponsiveness to hormone therapies and immunotherapy and the toxicity of chemotherapeutics account for the limited treatment options for TNBC. Ion channels have emerged as possible therapeutic candidates for cancer therapy, but little is known about how ligand gated ion channels, specifically, GABA type A ligand-gated ion channel receptors (GABAAR), affect cancer pathogenesis. Our results show that the GABAA β3 subunit is expressed at higher levels in TNBC cell lines than non-tumorigenic cells, therefore contributing to the idea that limiting the GABAAR via knockdown of the GABAA β3 subunit is a potential strategy for decreasing the proliferation and migration of TNBC cells. We employed pharmacological and genetic approaches to investigate the role of the GABAA β3 subunit in TNBC proliferation, migration, and cell cycle progression. The results suggest that pharmacological antagonism or genetic knockdown of GABAA β3 subunit decreases TNBC proliferation and migration. In addition, GABAA β3 subunit knockdown causes cell cycle arrest in TNBC cell lines via decreased cyclin D1 and increased p21 expression. Our findings suggest that membrane bound GABAA receptors containing the β3 subunit can be further developed as a potential novel target for the treatment of TNBC.
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Affiliation(s)
- J Bundy
- Department of Pharmaceutical Sciences, Philadelphia College of Pharmacy, Saint Joseph's University, Pharmacology and Toxicology Center (PTC), Philadelphia, PA, USA
| | - J Shaw
- Department of Pharmaceutical Sciences, Philadelphia College of Pharmacy, Saint Joseph's University, Pharmacology and Toxicology Center (PTC), Philadelphia, PA, USA
| | - M Hammel
- Department of Pharmaceutical Sciences, Philadelphia College of Pharmacy, Saint Joseph's University, Pharmacology and Toxicology Center (PTC), Philadelphia, PA, USA
| | - J Nguyen
- Department of Pharmaceutical Sciences, Philadelphia College of Pharmacy, Saint Joseph's University, Pharmacology and Toxicology Center (PTC), Philadelphia, PA, USA
| | - C Robbins
- Department of Pharmaceutical Sciences, Philadelphia College of Pharmacy, Saint Joseph's University, Pharmacology and Toxicology Center (PTC), Philadelphia, PA, USA
| | | | - A Suryanarayanan
- Department of Pharmaceutical Sciences, Philadelphia College of Pharmacy, Saint Joseph's University, Pharmacology and Toxicology Center (PTC), Philadelphia, PA, USA
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Hammel M, Touchard F, Burioli EAV, Paradis L, Cerqueira F, Chailler E, Bernard I, Cochet H, Simon A, Thomas F, Destoumieux-Garzón D, Charrière GM, Bierne N. Marine transmissible cancer navigates urbanized waters, threatening spillover. Proc Biol Sci 2024; 291:20232541. [PMID: 38378149 PMCID: PMC10878816 DOI: 10.1098/rspb.2023.2541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 01/22/2024] [Indexed: 02/22/2024] Open
Abstract
Inter-individual transmission of cancer cells represents a unique form of microparasites increasingly reported in marine bivalves. In this study, we sought to understand the ecology of the propagation of Mytilus trossulus Bivalve Transmissible Neoplasia 2 (MtrBTN2), a transmissible cancer affecting four Mytilus mussel species worldwide. We investigated the prevalence of MtrBTN2 in the mosaic hybrid zone of M. edulis and M. galloprovincialis along the French Atlantic coast, sampling contrasting natural and anthropogenic habitats. We observed a similar prevalence in both species, probably due to the spatial proximity of the two species in this region. Our results showed that ports had higher prevalence of MtrBTN2, with a possible hotspot observed at a shuttle landing dock. No cancer was found in natural beds except for two sites close to the hotspot, suggesting spillover. Ports may provide favourable conditions for the transmission of MtrBTN2, such as high mussel density, stressful conditions, sheltered and confined shores or buffered temperatures. Ships may also spread the disease through biofouling. Our results suggest ports may serve as epidemiological hubs, with maritime routes providing artificial gateways for MtrBTN2 propagation. This highlights the importance of preventing biofouling on docks and ship hulls to limit the spread of marine pathogens hosted by fouling species.
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Affiliation(s)
- M. Hammel
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
- IHPE, Univ Montpellier, CNRS, Ifremer, Univ Perpignan Via Domitia, Montpellier, France
| | - F. Touchard
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
| | - E. A. V. Burioli
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
- IHPE, Univ Montpellier, CNRS, Ifremer, Univ Perpignan Via Domitia, Montpellier, France
| | - L. Paradis
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
| | - F. Cerqueira
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
| | - E. Chailler
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
| | | | - H. Cochet
- Cochet Environnement, 56550 Locoal, France
| | - A. Simon
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
| | - F. Thomas
- CREEC/CANECEV (CREES), MIVEGEC, Unité Mixte de Recherches, IRD 224-CNRS 5290-Université de Montpellier, Montpellier, France
| | - D. Destoumieux-Garzón
- IHPE, Univ Montpellier, CNRS, Ifremer, Univ Perpignan Via Domitia, Montpellier, France
| | - G. M. Charrière
- IHPE, Univ Montpellier, CNRS, Ifremer, Univ Perpignan Via Domitia, Montpellier, France
| | - N. Bierne
- ISEM, Univ Montpellier, CNRS, IRD, Montpellier, Occitanie, France
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Burioli EAV, Hammel M, Vignal E, Vidal-Dupiol J, Mitta G, Thomas F, Bierne N, Destoumieux-Garzón D, Charrière GM. Transcriptomics of mussel transmissible cancer MtrBTN2 suggests accumulation of multiple cancer traits and oncogenic pathways shared among bilaterians. Open Biol 2023; 13:230259. [PMID: 37816387 PMCID: PMC10564563 DOI: 10.1098/rsob.230259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 09/12/2023] [Indexed: 10/12/2023] Open
Abstract
Transmissible cancer cell lines are rare biological entities giving rise to diseases at the crossroads of cancer and parasitic diseases. These malignant cells have acquired the amazing capacity to spread from host to host. They have been described only in dogs, Tasmanian devils and marine bivalves. The Mytilus trossulus bivalve transmissible neoplasia 2 (MtrBTN2) lineage has even acquired the capacity to spread inter-specifically between marine mussels of the Mytilus edulis complex worldwide. To identify the oncogenic processes underpinning the biology of these atypical cancers we performed transcriptomics of MtrBTN2 cells. Differential expression, enrichment, protein-protein interaction network, and targeted analyses were used. Overall, our results suggest the accumulation of multiple cancerous traits that may be linked to the long-term evolution of MtrBTN2. We also highlight that vertebrate and lophotrochozoan cancers could share a large panel of common drivers, which supports the hypothesis of an ancient origin of oncogenic processes in bilaterians.
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Affiliation(s)
- E A V Burioli
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Montpellier, France
| | - M Hammel
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Montpellier, France
- ISEM, Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France
| | - E Vignal
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Montpellier, France
| | - J Vidal-Dupiol
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Montpellier, France
| | - G Mitta
- IFREMER, UMR 241 Écosystèmes Insulaires Océaniens, Labex Corail, Centre Ifremer du Pacifique, Tahiti, Polynésie française
| | - F Thomas
- CREEC/CANECEV (CREES), MIVEGEC, Unité Mixte de Recherches, IRD 224-CNRS 5290-Université de Montpellier, Montpellier, France
| | - N Bierne
- ISEM, Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France
| | - D Destoumieux-Garzón
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Montpellier, France
| | - G M Charrière
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Montpellier, France
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Burioli EAV, Hammel M, Bierne N, Thomas F, Houssin M, Destoumieux-Garzón D, Charrière GM. Traits of a mussel transmissible cancer are reminiscent of a parasitic life style. Sci Rep 2021; 11:24110. [PMID: 34916573 PMCID: PMC8677744 DOI: 10.1038/s41598-021-03598-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2021] [Accepted: 12/03/2021] [Indexed: 12/22/2022] Open
Abstract
Some cancers have evolved the ability to spread from host to host by transmission of cancerous cells. These rare biological entities can be considered parasites with a host-related genome. Still, we know little about their specific adaptation to a parasitic lifestyle. MtrBTN2 is one of the few lineages of transmissible cancers known in the animal kingdom. Reported worldwide, MtrBTN2 infects marine mussels. We isolated MtrBTN2 cells circulating in the hemolymph of cancerous mussels and investigated their phenotypic traits. We found that MtrBTN2 cells had remarkable survival capacities in seawater, much higher than normal hemocytes. With almost 100% cell survival over three days, they increase significantly their chances to infect neighboring hosts. MtrBTN2 also triggered an aggressive cancerous process: proliferation in mussels was ~ 17 times higher than normal hemocytes (mean doubling time of ~ 3 days), thereby favoring a rapid increase of intra-host population size. MtrBTN2 appears to induce host castration, thereby favoring resources re-allocation to the parasites and increasing the host carrying capacity. Altogether, our results highlight a series of traits of MtrBTN2 consistent with a marine parasitic lifestyle that may have contributed to the success of its persistence and dissemination in different mussel populations across the globe.
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Affiliation(s)
- E A V Burioli
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Montpellier, France.
| | - M Hammel
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Montpellier, France
- ISEM, Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France
| | - N Bierne
- ISEM, Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France
| | - F Thomas
- CREEC/CANECEV (CREES), MIVEGEC, Unité Mixte de Recherches, IRD 224-CNRS 5290-Université de Montpellier, Montpellier, France
| | - M Houssin
- LABÉO, Caen, France
- Normandie Université, Université de Caen Normandie, FRE BOREA, CNRS-2030, IRD-207, MNHN, UPMC, UCN, Caen, France
| | - D Destoumieux-Garzón
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Montpellier, France
| | - G M Charrière
- IHPE, Univ Montpellier, CNRS, IFREMER, Univ Perpignan Via Domitia, Montpellier, France
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Aceytuno D, Piett C, Havali-Shahriari Z, Edwards R, Rey M, Mani R, Fang S, Hammel M, Weinfeld M, Tainer J, Schriemer D, Lees-Miller S, Glover J. Clinical dysregulation of DNA repair by the polynucleotide kinase/phosphatase-XRCC4-DNA ligase IV in neurological disease. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx361.058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Leksa N, Chiu PL, Bou-Assaf G, Quan C, Liu Z, Goodman A, Chambers M, Tsutakawa S, Hammel M, Peters R, Walz T, Kulman J. The structural basis for the functional comparability of factor VIII and the long-acting variant recombinant factor VIII Fc fusion protein. J Thromb Haemost 2017; 15:1167-1179. [PMID: 28397397 PMCID: PMC5500164 DOI: 10.1111/jth.13700] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Indexed: 01/13/2023]
Abstract
Essentials Recombinant factor VIII (rFVIII) Fc fusion protein has a 1.5-fold longer half-life than rFVIII. Five orthogonal methods were used to characterize the structure of rFVIIIFc compared to rFVIII. The C-terminal Fc fusion does not perturb the structure of FVIII in rFVIIIFc. The FVIII and Fc components of rFVIIIFc are flexibly tethered and functionally independent. SUMMARY Background Fusion of the human IgG1 Fc domain to the C-terminal C2 domain of B-domain-deleted (BDD) factor VIII (FVIII) results in the recombinant FVIII Fc (rFVIIIFc) fusion protein, which has a 1.5-fold longer half-life in humans. Objective To assess the structural properties of rFVIIIFc by comparing its constituent FVIII and Fc elements with their respective isolated components, and evaluating their structural independence within rFVIIIFc. Methods rFVIIIFc and its isolated FVIII and Fc components were compared by the use of hydrogen-deuterium exchange mass spectrometry (HDX-MS). The structure of rFVIIIFc was also evaluated by the use of X-ray crystallography, small-angle X-ray scattering (SAXS), and electron microscopy (EM). The degree of steric interference by the appended Fc domain was assessed by EM and surface plasmon resonance (SPR). Results HDX-MS analysis of rFVIIIFc revealed that fusion caused no structural perturbations in FVIII or Fc. The rFVIIIFc crystal structure showed that the FVIII component is indistinguishable from published BDD FVIII structures. The Fc domain was not observed, indicating high mobility. SAXS analysis was consistent with an ensemble of rigid-body models in which the Fc domain exists in a largely extended orientation relative to FVIII. Binding of Fab fragments of anti-C2 domain antibodies to BDD FVIII was visualized by EM, and the affinities of the corresponding intact antibodies for BDD FVIII and rFVIIIFc were comparable by SPR analysis. Conclusions The FVIII and Fc components of rFVIIIFc are structurally indistinguishable from their isolated constituents, and show a high degree of structural independence, consistent with the functional comparability of rFVIIIFc and unmodified FVIII.
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Affiliation(s)
| | - P.-L. Chiu
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | | | | | - Z. Liu
- Biogen, Cambridge, MA, USA
| | | | - M.G. Chambers
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - S.E. Tsutakawa
- Molecular Biophysics & Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - M. Hammel
- Molecular Biophysics & Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | | | - T. Walz
- Biogen, Cambridge, MA, USA
- Laboratory of Molecular Electron Microscopy, Rockefeller University, New York, NY, USA
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Tainer JA, Rambo RP, Hura GL, Hammel M. Accurate mass, models and resolution for high-throughput structural analyses. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311099077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Holzinger A, Staffler A, Flemmer AW, Nicolai T, Wegner M, Hammel M. Heterozygote SOX9 Mutationen mit Restaktivität bezüglich DNA-Bindung und Transkriptionsaktivierung führen zur acampomelen Form der campomelen Dysplasie. Klin Padiatr 2010. [DOI: 10.1055/s-0030-1261547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Mittal R, Jin L, Hammel M, Liebisch G, Schmitz G, Holzinger A. ABCA3+/- mice have significantly decreased amounts of phosphatidylcholine and phosphatidylglycerol in lung tissue. Klin Padiatr 2010. [DOI: 10.1055/s-0030-1261416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Herber-Jonat S, Huppmann M, Mittal R, Hammel M, Holzinger A, Flemmer AW. Charakterisierung der Lungenmechanik und Entzündungsreaktion in heterozygoten ABCA3-Mäusen nach Haltung in Raumluft und nach 72h in Sauerstoffumgebung. Klin Padiatr 2010. [DOI: 10.1055/s-0030-1261415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Bernstein NK, Hammel M, Mani RS, Weinfeld M, Pelikan M, Tainer JA, Glover JNM. Mechanism of DNA substrate recognition by the mammalian DNA repair enzyme, Polynucleotide Kinase. Nucleic Acids Res 2009; 37:6161-73. [PMID: 19671525 PMCID: PMC2764422 DOI: 10.1093/nar/gkp597] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2009] [Revised: 06/29/2009] [Accepted: 06/30/2009] [Indexed: 01/11/2023] Open
Abstract
Mammalian polynucleotide kinase (mPNK) is a critical DNA repair enzyme whose 5'-kinase and 3'-phoshatase activities function with poorly understood but striking specificity to restore 5'-phosphate/3'-hydroxyl termini at sites of DNA damage. Here we integrated site-directed mutagenesis and small-angle X-ray scattering (SAXS) combined with advanced computational approaches to characterize the conformational variability and DNA-binding properties of mPNK. The flexible attachment of the FHA domain to the catalytic segment, elucidated by SAXS, enables the interactions of mPNK with diverse DNA substrates and protein partners required for effective orchestration of DNA end repair. Point mutations surrounding the kinase active site identified two substrate recognition surfaces positioned to contact distinct regions on either side of the phosphorylated 5'-hydroxyl. DNA substrates bind across the kinase active site cleft to position the double-stranded portion upstream of the 5'-hydroxyl on one side, and the 3'-overhang on the opposite side. The bipartite DNA-binding surface of the mPNK kinase domain explains its preference for recessed 5'-termini, structures that would be encountered in the course of DNA strand break repair.
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Affiliation(s)
- N. K. Bernstein
- Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA, Department of Experimental Oncology, Cross Cancer Institute, Edmonton, Alberta, Canada, Department of Mathematics and Computer Science, University of Missouri in St. Louis, St. Louis, MO 63121, Department of Molecular Biology, Skaggs Institute of Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037 and Life Sciences Division, Department of Molecular Biology, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - M. Hammel
- Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA, Department of Experimental Oncology, Cross Cancer Institute, Edmonton, Alberta, Canada, Department of Mathematics and Computer Science, University of Missouri in St. Louis, St. Louis, MO 63121, Department of Molecular Biology, Skaggs Institute of Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037 and Life Sciences Division, Department of Molecular Biology, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - R. S. Mani
- Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA, Department of Experimental Oncology, Cross Cancer Institute, Edmonton, Alberta, Canada, Department of Mathematics and Computer Science, University of Missouri in St. Louis, St. Louis, MO 63121, Department of Molecular Biology, Skaggs Institute of Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037 and Life Sciences Division, Department of Molecular Biology, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - M. Weinfeld
- Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA, Department of Experimental Oncology, Cross Cancer Institute, Edmonton, Alberta, Canada, Department of Mathematics and Computer Science, University of Missouri in St. Louis, St. Louis, MO 63121, Department of Molecular Biology, Skaggs Institute of Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037 and Life Sciences Division, Department of Molecular Biology, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - M. Pelikan
- Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA, Department of Experimental Oncology, Cross Cancer Institute, Edmonton, Alberta, Canada, Department of Mathematics and Computer Science, University of Missouri in St. Louis, St. Louis, MO 63121, Department of Molecular Biology, Skaggs Institute of Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037 and Life Sciences Division, Department of Molecular Biology, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - J. A. Tainer
- Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA, Department of Experimental Oncology, Cross Cancer Institute, Edmonton, Alberta, Canada, Department of Mathematics and Computer Science, University of Missouri in St. Louis, St. Louis, MO 63121, Department of Molecular Biology, Skaggs Institute of Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037 and Life Sciences Division, Department of Molecular Biology, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - J. N. M. Glover
- Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA, Department of Experimental Oncology, Cross Cancer Institute, Edmonton, Alberta, Canada, Department of Mathematics and Computer Science, University of Missouri in St. Louis, St. Louis, MO 63121, Department of Molecular Biology, Skaggs Institute of Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037 and Life Sciences Division, Department of Molecular Biology, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
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Hammel M, Klein M, Trips T, Priessmann H, Ankermann T, Holzinger A. Congenital Central Hypoventilation Syndrome due to PHOX2b Gene Defects: Inheritance from Asymptomatic Parents. Klin Padiatr 2009; 221:286-9. [DOI: 10.1055/s-0029-1220941] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Flemmer AW, Herber-Jonat S, Schulz H, Huppmann M, Hammel M, Holzinger A. Heterozygote ABCA–3-knockout Mäuse unter mechanischer Beatmung. Z Geburtshilfe Neonatol 2009. [DOI: 10.1055/s-0029-1222838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hammel M, Liebisch G, Schmitz G, Hrabé de Angelis M, Holzinger A. Lipidomics von Lungen neugeborener Mäuse mit ABCA3-Mangel: – Identifikation von Phospholipid-Spezies als Substrate des lamellarkörperchen-spezifischen ABC-Transporters. Z Geburtshilfe Neonatol 2009. [DOI: 10.1055/s-0029-1222839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Classen S, Hura G, Frankel K, Hammel M, Rodic I, Tainer J. SAXS and macromolecular crystallography at the SIBYLS beamline (12.3.1) of the Advanced Light Source. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308094324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Letzgus A, Schulze A, Flemmer AW, Hammel M, Holzinger A. Milde Form eines zentralen kongenitalen Hypoventilationssyndroms im Neugeborenenalter. Z Geburtshilfe Neonatol 2008. [DOI: 10.1055/s-2008-1078875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Hammel M, Klein M, Trips T, Prießmann H, Holzinger A. Zwei Familien mit kongenitalem zentralem Hypoventilationssyndrom: Vererbung durch nicht-betroffene Eltern. Z Geburtshilfe Neonatol 2008. [DOI: 10.1055/s-2008-1078854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Schulte D, Hammel M, März A, Klugbauer N, Hofmann F, Holzinger A. Subzelluläres Targeting von ABCA3 an Lamellarkörperchen in Typ II Pneumozyten. Z Geburtshilfe Neonatol 2008. [DOI: 10.1055/s-2008-1078853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Hammel M, Michel G, Klaften M, Müller-Höcker J, Hrabé de Angelis M, Holzinger A. Die Inaktivierung des ABCA3-Gens der Maus führt zu respiratorischem Versagen bei Neugeborenen und Fehlen normaler Lamellarkörperchen. Z Geburtshilfe Neonatol 2007. [DOI: 10.1055/s-2007-983090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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20
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Receveur-Brechot V, Hammel M, Czjzek M, Bayer EA, Fierobe HP. Structural analysis of multi-enzymatic complexes by small angle X-ray scattering. Acta Crystallogr A 2006. [DOI: 10.1107/s0108767306098059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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21
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Karlovská J, Hammel M, Laggner P, Lacko I, Devínsky F, Balgavý P. Effects of N-alkyl-N,N-dimethylamine-N-oxides on the activity of purified sarcoplasmic reticulum Ca(2+)-transporting ATPase. Pharmazie 2005; 60:135-7. [PMID: 15739903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
N-alkyl-N,N-dimethylamine-N-oxides (CnNO, n = 10-20 is the number of alkyl carbon atoms) stimulate the skeletal sarcoplasmic reticulum (SR) Ca(2+)-transporting ATPase activity at low concentrations and inhibit it at high concentrations. The minimum concentration (cmin), at which CnNO inhibits the ATPase, continuously decreases up to n = 16-18 and then increases. The values of Cmin are smaller than the CnNO critical micelle concentration (cmc) for C10NO-C14NO homologs, but larger than cmc for C18NO-C20NO homologs. The ATPase inhibition is caused by the CnNO-induced lipid bilayer structural perturbation in the ATPase annular region, modulated by the partition equilibria of the CnNO molecules between the bilayer and aqueous phase for short alkyl chain (n = 10-16) CnNO homologs, and between the bilayer, micelles and aqueous phase for long alkyl chain (n = 18-20) CnNO homologs.
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Affiliation(s)
- J Karlovská
- Department of Physical Chemistry of Drugs, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia
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22
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Hammel M, Uhríková D, Balgavý P. Partition of local anesthetic heptacaine homologs between phosphatidylcholine bilayers in unilamellar liposomes and aqueous phase: UV-VIS spectrophotometry study. Pharmazie 2002; 57:499. [PMID: 12168538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Affiliation(s)
- M Hammel
- Department of Physical Chemistry of Drugs, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia
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23
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Jerlich A, Hammel M, Horakova L, Schaur RJ. An improved method for the sensitive monitoring of low density lipoprotein modification by myeloperoxidase. Redox Rep 2002; 6:257-64. [PMID: 11642717 DOI: 10.1179/135100001101536319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The aim of this investigation was to compare an improved fluorometric method with an UV absorbance assay for their ability to monitor low density lipoprotein (LDL) modification by myeloperoxidase (MPO) and to evaluate determining factors influencing the modification of LDL. Using absorbance at 234 nm to study the kinetics of LDL aggregation, and a native fluorescence assay for protein oxidation, we found that all components of the MPO/H2O2/Cl- system may have rate determining effects on LDL modification. While the lipoprotein modification rate correlated positively with enzyme concentration, variation of the concentration of H2O2 had a biphasic effect on the maximal rate of LDL modification with both methods. Furthermore, a positive association was found between the maximal rate of LDL modification and the acidity of the medium, with a pathophysiologically relevant optimal rate at a slightly acidic pH of 5-6, but hardly any modification above pH 6.8. In summary, both methods provide simple and useful tools for the continuous monitoring of LDL modification by the MPO/H2O2/Cl- system, but the more sensitive fluorometric method is preferable, since it allows the application of experimental conditions which are much closer to the situation in vivo.
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Affiliation(s)
- A Jerlich
- Institute of Molecular Biology, Biochemistry and Microbiology, University of Graz, Austria
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24
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Hammel M, Schwarzenbacher R, Gries A, Kostner GM, Laggner P, Prassl R. Mechanism of the interaction of beta(2)-glycoprotein I with negatively charged phospholipid membranes. Biochemistry 2001; 40:14173-81. [PMID: 11714270 DOI: 10.1021/bi0114372] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In an attempt to understand the multifunctional involvement of beta(2)-glycoprotein I (beta(2)GPI) in autoimmune diseases, thrombosis, atherosclerosis, and inflammatory processes, substantial interest is focused on the interaction of beta(2)GPI with negatively charged ligands, in particular, with acidic phospholipids. In this study, unilamellar vesicles composed of cardiolipin were used as in vitro membrane system to test and further refine a model of interaction based on the crystal structure of beta(2)GPI. The data suggest that beta(2)GPI anchors to the membrane surface with its hydrophobic loop adjacent to the positively charged lysine rich region in domain V. Subsequently, beta(2)GPI penetrates the membrane interfacial headgroup region as indicated by a restriction of the lipid side chain mobility, but without formation of a nonbilayer lipid phase. A structural rearrangement of beta(2)GPI upon lipid binding was detected by microcalorimetry and may result in the exposure of cryptic epitopes located in the complement control protein domains. This lipid-dependent conformational change may induce oligomerization of beta(2)GPI and promote intermolecular associations. Thus, the aggregation tendency of beta(2)GPI may serve as the basis for the formation of a molecular link between cells but may also be an essential feature for binding of autoantibodies and hence determine the role of beta(2)GPI in autoimmune diseases.
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Affiliation(s)
- M Hammel
- Institute of Biophysics and X-ray Structure Research of the Austrian Academy of Sciences, Schmiedlstrasse 6, A-8042 Graz, Austria
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Hammel M, Weitz-Schmidt G, Krause A, Moll T, Vestweber D, Zerwes HG, Hallmann R. Species-specific and conserved epitopes on mouse and human E-selectin important for leukocyte adhesion. Exp Cell Res 2001; 269:266-74. [PMID: 11570819 DOI: 10.1006/excr.2001.5317] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Selectins are C-type, cell surface lectins that are key players in leukocyte adhesion to the blood vessel wall endothelium. We describe here epitopes for a series of novel monoclonal antibodies (moAbs), UZ4-UZ7, directed against mouse E-selectin. All four antibodies specifically bind to mouse E-selectin, but not to P- or L-selectin, and all inhibit the adhesion of granulocytes, peripheral blood lymphocytes, and promyelocytic HL-60 cells to cytokine-activated mouse endothelium. Three moAbs, UZ5, UZ7, and UZ6, specifically inhibit mouse E-selectin-mediated adhesion by binding to epitopes in domains CR1 or CR2. moAb UZ4 inhibits leukocyte adhesion to both human and murine endothelium activated with IL-1 or other proinflammatory stimuli. UZ4 is the first described moAb that detects an epitope in the lectin domain which is conserved in both murine and human E-selectin (CXKKKL), but is not present in the other members of the selectin family, P- and L-selectin. Interestingly, UZ5, UZ6, and UZ7 more efficiently interfere with lymphocyte than with granulocyte adhesion to cytokine-activated endothelium, while UZ4 completely blocks adhesion of PMN, lymphocytes, and HL-60 and U937 cell lines. The data suggest that E-selectin-ligand engagement differs between lymphocytes and PMN, and that these differences may be accentuated by the CR1 and CR2 domains in the E-selectin cell adhesion molecule.
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Affiliation(s)
- M Hammel
- Experimental Medicine I, University Erlangen-Nürnberg, Erlangen, Germany
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Jerlich A, Fritz G, Kharrazi H, Hammel M, Tschabuschnig S, Glatter O, Schaur RJ. Comparison of HOCl traps with myeloperoxidase inhibitors in prevention of low density lipoprotein oxidation. Biochim Biophys Acta 2000; 1481:109-18. [PMID: 11004581 DOI: 10.1016/s0167-4838(00)00112-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
In this study, the production of the highly toxic oxidant hypochlorous acid (HOCl) by the phagocytic enzyme myeloperoxidase (MPO) was quantitated and the concomitant alterations of low density lipoprotein (LDL) were analyzed in view of the potential role of LDL in atherosclerosis. Using the monochlorodimedone assay, it was found that HOCl is produced in micromolar concentrations. The kinetics of the decrease of tryptophan fluorescence appeared to be a sensitive method to monitor LDL alterations under near in vivo conditions. Therefore, this method was used to subsequently compare the effectiveness of MPO inhibitors that block production of HOCl with compounds that act as HOCl traps. The efficiency of MPO inhibitors to prevent LDL damage increased in the series benzohydroxamic acid < salicylhydroxamic acid < 3-amino-1,2,4-triazole < sodium azide < potassium cyanide < p-hydroxy-benzoic acid hydrazide, while for the HOCl traps the protective efficiency increased in the series glycine < taurine < methionine. We conclude that HOCl traps may have high potential therapeutic impact in vivo due to their low toxicity, although high concentrations of them would have to reach sites of inflammation. In contrast, only low concentrations of a specific MPO inhibitor would be required to irreversibly inhibit the enzyme.
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Affiliation(s)
- A Jerlich
- Institute of Molecular Biology, Biochemistry and Microbiology, University of Graz, Austria
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Jerlich A, Hammel M, Nigon F, Chapman MJ, Schaur RJ. Kinetics of tryptophan oxidation in plasma lipoproteins by myeloperoxidase-generated HOCl. Eur J Biochem 2000; 267:4137-43. [PMID: 10866816 DOI: 10.1046/j.1432-1327.2000.01449.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The relative susceptibility of the apoprotein components of human lipoproteins [high-density lipoprotein (HDL) and low-density lipoprotein (LDL)] and their subclasses to oxidation by the myeloperoxidase/H2O2/Cl- system in vitro was studied by measuring the decrease in rate of tryptophan fluorescence. Whereas the lipoprotein-modification rate showed a saturation type of dependence on the concentration of myeloperoxidase, a biphasic dependence on the concentration of the lipoproteins was found. High concentrations of H2O2 were also found to inhibit tryptophan oxidation in LDL but to a lesser extent in HDL. The optimal rate of LDL and HDL modification was observed at pH 6.0. HDL was modified much more rapidly than LDL, which may be due to differences in size and different relative contents of protein and lipids per particle. No differences in rates of modification of LDL subclasses were observed, when the assays were standardized to equal LDL protein concentrations, but, when standardized to equal particle mass, an optimum at subclass 8 was found, which is probably due to differences in apolipoprotein B-100 conformation. It was concluded that HDL may have a beneficial effect in retarding LDL modification in inflammatory processes.
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Affiliation(s)
- A Jerlich
- Institute of Molecular Biology, Biochemistry and Microbiology, University of Graz, Austria
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Hammel M, Uhríková D, Balgavý P. [Interactions of surfactants with model and biological membranes. XXII. Spectrophotometric determination of partition coefficient of heptacaine, a local anesthetic, between the phospholipid liposome and water phase]. Ceska Slov Farm 1996; 45:58-66. [PMID: 8653276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The partition coefficient of the local anaesthetic heptacaine (monohydrochloride of [2-(heptaloxy)phenyl]-2-(1-piperidinyl)ethyl ester of carbamic acid) between unilamellar liposomes prepared from chromatographically pure egg yolk phosphatidylcholine and the aqueous phase (NaCl solution, ionic strength I = 0,1,pH 4,5, temperature t = 20 degrees C) was determined using UV-VIS spectrophotometry. The contribution to the anaesthetic spectra due to light scattering on liposomes was eliminated numerically using the scattering function. This procedure gave more precise results than the subtraction of liposomes spectra. The values of the partition coefficient defined with the use of molar concentrations, weight concentrations and molar fractions estimated at a wavelength of lambda = 292 nm were Kp = 1116 +/- 49, Kp(m) = 1098 +/- 48 and Kp(x) = 47575 +/- 2089, respectively.
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Affiliation(s)
- M Hammel
- Katedra fyzikálnej chémie lieciv Farmaceutical fakulty University Komenského, Bratislava
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Schneider R, Hammel M, Berger EG, Ghisalba O, Nueesch J, Gygax D. Immobilization of galactosyltransferase and continuous galactosylation of glycoproteins in a reactor. Glycoconj J 1990; 7:589-600. [PMID: 2136355 DOI: 10.1007/bf01189079] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We immobilized human milk galactosyltransferase covalently to CNBr- and tresylchloride-activated Sepharose. The enzyme was also immobilized non-covalently to Concanavalin A-Sepharose and to monoclonal anti-galactosyltransferase antibodies which were bound via their Fc-fragment to Protein G-Sepharose. With the covalent methods, up to 72% of the enzyme could be bound to the carrier, but more than 90% of the specific activity was lost. In contrast, non-covalent immobilization yielded only about 50% immobilization efficiency, but 21% and 25% of specific activity, respectively, could be recovered. The stability of immobilized galactosyltransferase as compared to native enzyme was considerably increased: at room temperature, 55% of initial immobilized activity was lost after 65 hours compared to 95% of loss of soluble enzyme activity. Immobilized galactosyltransferase was then used for continuous galactosylation of the glycoproteins ovalbumin, endo H-treated yeast invertase and bovine serum albumin-N-acetylglucosamine in a "slurry" reactor. 55%, 35% and 25%, respectively, of all acceptor sites on these glycoproteins could be galactosylated by this method.
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Affiliation(s)
- R Schneider
- Central Research Laboratories, Ciba-Geigy AG, Basel, Switzerland
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Abstract
Prescription-writing is an important aspect of medical practice. Illegible and/or incorrect prescriptions can result in loss of patient, physician, and pharmacist time and may cause therapeutic errors or drug toxicity. An examination to evaluate prescription-writing was administered to a group of pediatric house officers and faculty. Follow-up monitoring of actual prescriptions written in the pediatric clinic was performed. Deficient prescription-writing techniques and weakness in the therapeutic knowledge of beginning pediatric interns were identified. The data indicate that proper prescription-writing (especially the use of controlled substances) should be taught to house officers and that the therapeutic knowledge of beginning pediatric interns cannot be assumed to be adequate.
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Findlay HV, Hammel M. Staphylococcus Aureus Meningitis: Report of Case: Treatment with Sulfanilamide-Recovery. Cal West Med 1939; 51:324-325. [PMID: 18745384 PMCID: PMC1660145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
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