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Baska F, Bozó É, Szeleczky Z, Szántó G, Vukics K, Szakács Z, Domány-Kovács K, Kurkó D, Vass E, Thán M, Vastag M, Temesvári K, Lévai S, Halász AS, Szondiné Kordás K, Román V, Greiner I, Bata I. Discovery and Characterization of RGH-122, a Potent, Selective, and Orally Bioavailable V1a Receptor Antagonist. J Med Chem 2024; 67:643-673. [PMID: 38165765 DOI: 10.1021/acs.jmedchem.3c01868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
The V1a receptor is a major contributor in mediating the social and emotional effects of arginine-vasopressin (AVP); therefore it represents a promising target in the treatment of several neuropsychiatric conditions. The aim of this research was to design and synthesize novel and selective V1a antagonists with improved in vitro and in vivo profiles. Through optimization and detailed SAR studies, we developed low nanomolar antagonists, and further characterizations led to the discovery of the clinical candidate compound 43 (RGH-122). The CNS activity of the compound was determined in a 3-chamber social preference test of autism in which RGH-122 successfully enhanced social preference with the lowest effective dose of 1.5 mg/kg.
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Affiliation(s)
- Ferenc Baska
- Gedeon Richter Plc, PO Box 27, Budapest H-1475, Hungary
| | - Éva Bozó
- Gedeon Richter Plc, PO Box 27, Budapest H-1475, Hungary
| | | | - Gábor Szántó
- Gedeon Richter Plc, PO Box 27, Budapest H-1475, Hungary
| | | | | | | | - Dalma Kurkó
- Gedeon Richter Plc, PO Box 27, Budapest H-1475, Hungary
| | - Elemér Vass
- Institute of Chemistry, Eötvös Loránd University, Pázmány Péter sétány 1/A, Budapest H-1117, Hungary
| | - Márta Thán
- Gedeon Richter Plc, PO Box 27, Budapest H-1475, Hungary
| | - Mónika Vastag
- Gedeon Richter Plc, PO Box 27, Budapest H-1475, Hungary
| | | | - Sándor Lévai
- Gedeon Richter Plc, PO Box 27, Budapest H-1475, Hungary
| | | | | | - Viktor Román
- Gedeon Richter Plc, PO Box 27, Budapest H-1475, Hungary
| | | | - Imre Bata
- Gedeon Richter Plc, PO Box 27, Budapest H-1475, Hungary
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Őri D, Vass E, Vajsz K, Vincze K, Sztancsik V, Szemán-Nagy A, Simon L. Psychometric validation of the Reported and Intended Behaviour Scale (RIBS) in Hungary with a particular focus on 'Don't know' responses and further scoring recommendations. BMC Public Health 2023; 23:1773. [PMID: 37700224 PMCID: PMC10496190 DOI: 10.1186/s12889-023-16707-3] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 09/05/2023] [Indexed: 09/14/2023] Open
Abstract
AIMS Reported and Intended Behaviour Scale (RIBS) was designed to measure mental health stigma-related behaviors in the general public. We aimed to examine its psychometric properties and validate the scale in a Hungarian non-clinical community sample. The secondary aim of this study was to assess the appropriateness of the current scoring recommendations of 'Don't know' responses being coded as neutral, which had never been investigated before. In addition, we provide an overview of the results of already existing studies on the scale. METHODS Hungarian participants completed the RIBS within this cross-sectional online survey study and were considered non-clinical individuals based on a cut-off point of the Global Severity Index T score of 63 on the Symptom Checklist-90-Revised. Confirmatory factor analysis, reliability measures, and comparative analyses were performed. RESULTS Of the n = 5,701, n = 5,141 participants were included in the analysis. The mean age was 27.8 ± 11.1 years, and 89.2% (n = 4,587) of the sample were female. The unidimensional structure was supported by good model fit indices (RMSEA = 0.031, CFI = 0.999, TLI = 0.996, and WRMR = 0.006). Internal consistency of the RIBS and its test-retest reliability with a 5-month follow-up period were found to be good (Cronbach's alpha = 0.88 and ICC = 0.838). We found statistically significant differences between the total scores when the 'Don't know' responders were excluded from the sample or when they were coded as neutral as recommended by the scale authors (16 (IQR:13-18) vs. 15 (IQR:13-18) p < 0.0001). There were also statistically significant differences between 'Neither agree nor disagree' and 'Don't know' participants in several aspects of lived experiences of mental health problems. CONCLUSIONS The RIBS demonstrated good psychometric properties and can be transferred to the Hungarian context. It will be a valuable tool in assessing stigmatizing behavior and testing the efficacy of antistigma programs. Our results suggest that 'Neither agree nor disagree' and 'Don't know' responses bear different meanings, and coding should account for this.
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Affiliation(s)
- D Őri
- Institute of Behavioural Sciences, Semmelweis University, Nagyvárad Tér 4., 1089, Budapest, Hungary.
- Department of Mental Health, Heim Pál National Pediatric Institute, Budapest, Hungary.
- Department of Psychology, Illinois Institute of Technology, Chicago, USA.
| | - E Vass
- Department of Psychiatry and Psychotherapy, Semmelweis University, Budapest, Hungary
| | - K Vajsz
- Institute of Psychology, Eötvös Loránd University, Budapest, Hungary
- Department of Clinical Psychology, Semmelweis University, Budapest, Hungary
| | - K Vincze
- Institute of Environmental Medicine, Karolinska Institute, Solna, Sweden
| | - V Sztancsik
- Department of Psychiatry, Clinical Center of the University of Debrecen, Debrecen, Hungary
| | - A Szemán-Nagy
- Department of Personality and Clinical Psychology, University of Debrecen, Debrecen, Hungary
| | - L Simon
- Department of Psychiatry and Psychotherapy, Semmelweis University, Budapest, Hungary
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Simon V, Herman L, Vass E, Csukly G, Zsigmond R, Réthelyi J. The Development of a Complex FEP Program at Semmelweis University. Eur Psychiatry 2022. [PMCID: PMC9567451 DOI: 10.1192/j.eurpsy.2022.86] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Introduction First episode psychosis (FEP) programs target the first 3-5 years after the first manifestation of a psychotic episode. Although follow-up results after 10-15 years are mixed, reported results of the first 5-10 years are promising in improving relapse prevention, functional outcomes and reducing mental health care costs, compared to treatment as usual. Objectives Our objective was to develop the first complex FEP program in Hungary. Methods Male and female inpatients, (age:17-40years), hospitalized due to a first psychotic episode and consenting to participate, were included, since 2019 October. Drug induced psychosis and organic background in the etiology of the psychotic episode were excluded. Duration of the program is 2-3 years, based on the individual needs of the patients. The program provides detailed clinical and neuropsychological examinations, MRI, pharmacotherapy, various psychosocial interventions, and support group for relatives. Results Twenty-eight patients [15 male,13 female, mean age=22,4 (18-40)years] were included. The program has been repeatedly limited by COVID-19 pandemic. Psychiatric control, pharmacotherapy, psychoeducation and supportive therapy, however could be continously provided via telepsychiatry, even during the lockdown. During the first 2 years, 90% of the patients remained in treatment, showed good compliance with pharmacotherapy; 10% of the patients were rehospitalized due to relapse. In the presentation, besides clinical experiences, preliminary clinical outcome data will also be presented. Conclusions The first complex FEP program in Hungary, although limited repeatedly by the pandemic, show promising clinical results with low relapse rates and high level of adherence to therapy in the first 2 years after a first psychotic episode.
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Szeleczky Z, Szakács Z, Bozó É, Baska F, Vukics K, Lévai S, Temesvári K, Vass E, Béni Z, Krámos B, Magdó I, Szántay C, Kóti J, Domány-Kovács K, Greiner I, Bata I. Synthesis and Characterization of New V 1A Antagonist Compounds: The Separation of Four Atropisomeric Stereoisomers. J Med Chem 2021; 64:10445-10468. [PMID: 34255509 DOI: 10.1021/acs.jmedchem.1c00863] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A new class of selective vasopressin receptor 1A (V1A) antagonists was identified, where "methyl-scan" was performed around the benzene ring of the 5-hydroxy-triazolobenzazepine core. This led to the synthesis of two 10-methyl derivatives, each possessing a chiral axis and a stereogenic center. The four atropisomeric stereoisomers (involving two enantiomer pairs and atropisomeric diastereomers) could be successfully isolated and spectroscopically characterized. According to the in vitro pharmacological profiles of the compounds, the human V1A receptor has a strong preference toward the isomers having an aR axial chirality, the most active isomer being the aR,5S isomer. Furthermore, the structure-activity relationships obtained for the isomers and for the newly synthesized analogues could be tentatively explained by an in silico study.
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Affiliation(s)
- Zsolt Szeleczky
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Zoltán Szakács
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Éva Bozó
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Ferenc Baska
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | | | - Sándor Lévai
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | | | - Elemér Vass
- Institute of Chemistry, Eötvös Loránd University, Pázmány Péter sétány 1/A, Budapest H-1117, Hungary
| | - Zoltán Béni
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Balázs Krámos
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Ildikó Magdó
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Csaba Szántay
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - János Kóti
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | | | - István Greiner
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Imre Bata
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
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Hegedüs K, Fehér C, Jalsovszky I, Kristóf Z, Rohonczy J, Vass E, Farkas A, Csizmadia T, Friedbacher G, Hantz P. Facile isolation and analysis of sporopollenin exine from bee pollen. Sci Rep 2021; 11:9952. [PMID: 33976296 PMCID: PMC8113464 DOI: 10.1038/s41598-021-87619-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 08/03/2019] [Accepted: 03/24/2021] [Indexed: 11/21/2022] Open
Abstract
We present facile methods to obtain purified sporopollenin exine capsules, and provide mass balances for classical and novel purification procedures. An ionic liquid, tetrabutyl phosphonium hydroxide turned out to be the most effective in removing the intine wall. The sporopollenin capsules were investigated by fluorescent microscopy, AFM, solid-state NMR and infrared Raman spectroscopy. The latter two methods showed that sunflower and rape exines have different proportions of O-aliphatic and aromatic constituents. Purified exine capsules were coated with functionalized fluorophores. The procedures presented in this paper could contribute to further spread of the applications of this hollow, and chemically highly resistant material.
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Affiliation(s)
- Kristóf Hegedüs
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, Budapest, 1117, Hungary
| | - Csaba Fehér
- Department of Applied Biotechnology and Food Science, Budapest University of Technology and Economics, Szent Gellért tér 4, Budapest, 1111, Hungary
| | - István Jalsovszky
- Department of Organic Chemistry, Eötvös Loránd University, Pázmány Péter sétány 1/A, Budapest, 1117, Hungary
| | - Zoltán Kristóf
- Department of Plant Anatomy, Eötvös Loránd University, Pázmány Péter sétány 1/A, Budapest, 1117, Hungary
| | - János Rohonczy
- Department of Inorganic Chemistry, Eötvös Loránd University, Pázmány Péter sétány 1/A, Budapest, 1117, Hungary
| | - Elemér Vass
- Department of Organic Chemistry, Eötvös Loránd University, Pázmány Péter sétány 1/A, Budapest, 1117, Hungary
| | - Attila Farkas
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budafoki út 8, Budapest, 1111, Hungary
| | - Tamás Csizmadia
- Department of Anatomy, Cell and Developmental Biology, Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest, 1117, Hungary
| | - Gernot Friedbacher
- Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9, 1060, Wien, Austria
| | - Peter Hantz
- Department of Organic Chemistry, Eötvös Loránd University, Pázmány Péter sétány 1/A, Budapest, 1117, Hungary.
- Fibervar Llc., Str. Bolintineanu Nr. 20, 400062, Cluj/Kolozsvár, Romania.
- Centre for Ecological Research, Karolina út 29, Budapest, 1113, Hungary.
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Szabó M, Kleineisel M, Németh K, Domján A, Vass E, Szilvágyi G. Twisted paddlewheel rhodium complexes: Contribution of central and axial chirality to ECD, VCD, and NMR spectra. Chirality 2020; 32:446-456. [PMID: 32031731 DOI: 10.1002/chir.23182] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 10/01/2019] [Revised: 01/03/2020] [Accepted: 01/17/2020] [Indexed: 01/14/2023]
Abstract
Dirhodium complexes bearing N-substituted chiral amino acid ligands are investigated. These complexes have an unusual twisted paddlewheel structure, showing inherent chirality. We would like to demonstrate that parallel application of chiroptical spectroscopic methods (ECD and VCD) and NMR spectroscopy combined with quantum chemical calculations constitutes a powerful tool to determine the configuration of the complexes unequivocally. Two chiroptical methods are needed to determine the absolute configuration: ECD for the coordinated nitrogen atom and VCD for the rhodium core. A quick to use NMR method is also presented: Upon the coordination of small molecules in the axial position, the relative configuration of both the rhodium core and the nitrogen atom can be determined simultaneously by studying spatial proximities provided by 1D NOE spectra.
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Affiliation(s)
- Márk Szabó
- Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary.,NMR Laboratory, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Instrumentation Centre, Budapest, Hungary
| | - Márk Kleineisel
- Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary
| | - Krisztina Németh
- MS Metabolomics Laboratory, Hungarian Academy of Sciences, Research Center for Natural Sciences, Instrumentation Centre, Budapest, Hungary
| | - Attila Domján
- NMR Laboratory, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Instrumentation Centre, Budapest, Hungary
| | - Elemér Vass
- Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary
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Nemes A, Vass E, Jalsovszky I, Szabó D. Synthesis of enantiopure 2-iodomandelic acid and determination of its absolute configuration by VCD spectroscopy. Chem Pap 2019. [DOI: 10.1007/s11696-018-0568-6] [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: 10/28/2022]
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Fekete Z, Vass E, Kancsev A. Theoretical Background and Treatment of Social Cognitive Impairment in Schizophrenia- What is Known and What is Needed? Eur Psychiatry 2015. [DOI: 10.1016/s0924-9338(15)32092-7] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Majer Z, Vass E, Roščić M, Hollósi M, Horvat Š, Jakas A. Metal-Binding Ability of Leu-Enkephalin, Related Glycoconjugates and Peptidomimetics. CROAT CHEM ACTA 2015. [DOI: 10.5562/cca2725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Knapp K, Górecki M, Frelek J, Luboradzki R, Hollósi M, Majer Z, Vass E. Comprehensive Chiroptical Study of Proline-Containing Diamide Compounds. Chirality 2014; 26:228-42. [DOI: 10.1002/chir.22305] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Accepted: 01/13/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Krisztina Knapp
- Laboratory for Chiroptical Structure Analysis, Institute of Chemistry; Eötvös Loránd University; Budapest Hungary
| | - Marcin Górecki
- Institute of Organic Chemistry; Polish Academy of Sciences; Warsaw Poland
| | - Jadwiga Frelek
- Institute of Organic Chemistry; Polish Academy of Sciences; Warsaw Poland
| | - Roman Luboradzki
- Institute of Physical Chemistry; Polish Academy of Sciences; Warsaw Poland
| | - Miklós Hollósi
- Laboratory for Chiroptical Structure Analysis, Institute of Chemistry; Eötvös Loránd University; Budapest Hungary
| | - Zsuzsa Majer
- Laboratory for Chiroptical Structure Analysis, Institute of Chemistry; Eötvös Loránd University; Budapest Hungary
| | - Elemér Vass
- Laboratory for Chiroptical Structure Analysis, Institute of Chemistry; Eötvös Loránd University; Budapest Hungary
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Tőkési N, Oláh J, Hlavanda E, Szunyogh S, Szabó A, Babos F, Magyar A, Lehotzky A, Vass E, Ovádi J. Identification of motives mediating alternative functions of the neomorphic moonlighting TPPP/p25. Biochim Biophys Acta Mol Basis Dis 2014; 1842:547-57. [PMID: 24463170 DOI: 10.1016/j.bbadis.2014.01.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [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: 09/17/2013] [Revised: 01/09/2014] [Accepted: 01/13/2014] [Indexed: 12/21/2022]
Abstract
The disordered Tubulin Polymerization Promoting Protein (TPPP/p25), a prototype of neomorphic moonlighting proteins, displays physiological and pathological functions by interacting with distinct partners. Here the role of the disordered N- and C-termini straddling a middle flexible segment in the distinct functions of TPPP/p25 was established, and the binding motives responsible for its heteroassociations with tubulin and α-synuclein, its physiological and pathological interacting partner, respectively, were identified. We showed that the truncation of the disordered termini altered the folding state of the middle segment and has functional consequences concerning its physiological function. Double truncation diminished its binding to tubulin/microtubules, consequently the tubulin polymerization/microtubule bundling activities of TPPP/p25 were lost highlighting the role of the disordered termini in its physiological function. In contrast, interaction of TPPP/p25 with α-synuclein was not affected by the truncations and its α-synuclein aggregation promoting activity was preserved, showing that the α-synuclein binding motif is localized within the middle segment. The distinct tubulin and α-synuclein binding motives of TPPP/p25 were also demonstrated at the cellular level: the double truncated TPPP/p25 did not align along the microtubules in contrast to the full length form, while it induced α-synuclein aggregation. The localization of the binding motives on TPPP/p25 were established by specific ELISA experiments performed with designed and synthesized peptides: motives at the 178-187 and 147-156 segments are involved in the binding of tubulin and α-synuclein, respectively. The dissimilarity of these binding motives responsible for the neomorphic moonlighting feature of TPPP/p25 has significant innovative impact in anti-Parkinson drug research.
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Affiliation(s)
- Natália Tőkési
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1113 Budapest, Hungary.
| | - Judit Oláh
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1113 Budapest, Hungary.
| | - Emma Hlavanda
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1113 Budapest, Hungary.
| | - Sándor Szunyogh
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1113 Budapest, Hungary.
| | - Adél Szabó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1113 Budapest, Hungary.
| | - Fruzsina Babos
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Eötvös Loránd University, 1117 Budapest, Hungary.
| | - Anna Magyar
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Eötvös Loránd University, 1117 Budapest, Hungary.
| | - Attila Lehotzky
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1113 Budapest, Hungary.
| | - Elemér Vass
- Department of Organic Chemistry, Institute of Chemistry, Eötvös Loránd University, 1117 Budapest, Hungary.
| | - Judit Ovádi
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1113 Budapest, Hungary.
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Dutt Konar A, Vass E, Hollósi M, Majer Z, Grüber G, Frese K, Sewald N. Conformational properties of secondary amino acids: replacement of pipecolic acid by N-methyl-l-alanine in efrapeptin C. Chem Biodivers 2013; 10:942-51. [PMID: 23681735 DOI: 10.1002/cbdv.201300086] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Indexed: 11/08/2022]
Abstract
The efrapeptins, a family of naturally occurring peptides with inhibitory activities against ATPases, contain several α,α-disubstituted α-amino acids such as α-aminoisobutyric acid (Aib) or isovaline (Iva) besides pipecolic acid (Pip), β-Ala, Leu, Gly, and a C-terminal heterocyclic residue. Secondary α-amino acids such as proline are known to stabilize discrete conformations in peptides. A similar influence is ascribed to N-alkyl α-amino acids. We synthesized two efrapeptin C analogs with replacement of Pip by N-methyl-L-alanine (MeAla) using a combination of solid- and solution-phase techniques in a fragment-condensation strategy to compare the conformational bias of both secondary amino acids. The solution conformation was investigated by vibrational circular dichroism (VCD) to probe whether the analogs adopt a 310 -helical conformation. The MeAla-containing analogs [MeAla(1,3) ]efrapeptin C and [MeAla(1,3,11) ]efrapeptin C inhibit ATP hydrolysis by the A3 B3 complex of A1 A0 -ATP synthase from Methanosarcina mazei Gö1.
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Majer Z, Szilvágyi G, Benedek L, Csámpai A, Hollósi M, Vass E. Chelate Structure of a Dirhodium–Amino Acid Complex Identified by Chiroptical and NMR Spectroscopy. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300057] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Zsuzsa Majer
- Institute of Chemistry, Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/A, Hungary, Fax: +36‐1‐3722592, http://www.chem.elte.hu/departments/kiro/
| | - Gábor Szilvágyi
- Institute of Chemistry, Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/A, Hungary, Fax: +36‐1‐3722592, http://www.chem.elte.hu/departments/kiro/
| | - László Benedek
- Institute of Chemistry, Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/A, Hungary, Fax: +36‐1‐3722592, http://www.chem.elte.hu/departments/kiro/
| | - Antal Csámpai
- Institute of Chemistry, Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/A, Hungary, Fax: +36‐1‐3722592, http://www.chem.elte.hu/departments/kiro/
| | - Miklós Hollósi
- Institute of Chemistry, Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/A, Hungary, Fax: +36‐1‐3722592, http://www.chem.elte.hu/departments/kiro/
| | - Elemér Vass
- Institute of Chemistry, Eötvös Loránd University, 1117 Budapest Pázmány Péter sétány 1/A, Hungary, Fax: +36‐1‐3722592, http://www.chem.elte.hu/departments/kiro/
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Weigelt S, Huber T, Hofmann F, Jost M, Ritzefeld M, Luy B, Freudenberger C, Majer Z, Vass E, Greie J, Panella L, Kaptein B, Broxterman QB, Kessler H, Altendorf K, Hollósi M, Sewald N. Corrigendum: Synthesis and Conformational Analysis of Efrapeptins. Chemistry 2013. [DOI: 10.1002/chem.201300488] [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]
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Szilvágyi G, Brém B, Báti G, Tölgyesi L, Hollósi M, Vass E. Dirhodium complexes: determination of absolute configuration by the exciton chirality method using VCD spectroscopy. Dalton Trans 2013; 42:13137-44. [DOI: 10.1039/c3dt51567b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hollósi M, Vass E, Szilvágyi G, Jakas A, Laczkó I. Structure analysis of proteins, peptides and metal complexes by vibrational circular dichroism. ARKIVOC 2012. [DOI: 10.3998/ark.5550190.0013.524] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Frelek J, Górecki M, Łaszcz M, Suszczyńska A, Vass E, Szczepek WJ. Distinguishing between polymorphic forms of linezolid by solid-phase electronic and vibrational circular dichroism. Chem Commun (Camb) 2012; 48:5295-7. [DOI: 10.1039/c2cc31207g] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Weigelt S, Huber T, Hofmann F, Jost M, Ritzefeld M, Luy B, Freudenberger C, Majer Z, Vass E, Greie JC, Panella L, Kaptein B, Broxterman QB, Kessler H, Altendorf K, Hollósi M, Sewald N. Synthesis and Conformational Analysis of Efrapeptins. Chemistry 2011; 18:478-87. [DOI: 10.1002/chem.201102134] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Indexed: 11/11/2022]
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Irimie FD, Pop L, Czompa A, Paizs C, Toşa M, Vass E, Mátyus P. Lipase-Catalyzed Synthesis of Both Enantiomers of 3-Chloro-1-arylpropan-1-ols. SYNTHESIS-STUTTGART 2011. [DOI: 10.1055/s-0030-1260149] [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: 10/17/2022]
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Sebestyén Z, Máthé K, Buvári-Barcza Á, Vass E, Ruff F, Szemán J, Barcza L. Diverse associations in the ternary systems of β-cyclodextrin, simple carbohydrates and phenyl derivatives of inorganic oxoacids. Carbohydr Res 2011; 346:833-8. [DOI: 10.1016/j.carres.2010.12.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2010] [Revised: 11/26/2010] [Accepted: 12/14/2010] [Indexed: 10/18/2022]
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Góbi S, Vass E, Magyarfalvi G, Tarczay G. Effects of strong and weak hydrogen bond formation on VCD spectra: a case study of 2-chloropropionic acid. Phys Chem Chem Phys 2011; 13:13972-84. [DOI: 10.1039/c1cp20797k] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zafeiratos S, Paloukis F, Papakonstantinou G, Teschner D, Hävecker M, Vass E, Schnörch P, Knop-Gericke A, Schlögl R, Moreno B. A comparative in situ XPS study of PtRuCo catalyst in methanol steam reforming and water gas shift reactions. Catal Today 2010. [DOI: 10.1016/j.cattod.2010.03.030] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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24
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Mándity IM, Fülöp L, Vass E, Tóth GK, Martinek TA, Fülöp F. Building β-peptide H10/12 foldamer helices with six-membered cyclic side-chains: fine-tuning of folding and self-assembly. Org Lett 2010; 12:5584-7. [PMID: 21050013 DOI: 10.1021/ol102494m] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The ability of the β-peptidic H10/12 helix to tolerate side-chains containing six-membered alicyclic rings was studied. cis-2-Aminocyclohex-3-ene carboxylic acid (cis-ACHEC) residues afforded H10/12 helix formation with alternating backbone configuration. Conformational polymorphism was observed for the alternating cis-ACHC hexamer, where chemical exchange takes place between the major left-handed H10/12 helix and a minor folded conformation. The hydrophobically driven self-assembly was achieved for the cis-ACHC-containing helix which was observed as vesicles ~100 nm in diameter.
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Affiliation(s)
- István M Mándity
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Eötvös u. 6, Hungary
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Szilvágyi G, Majer Z, Vass E, Hollósi M. Conformational studies on chiral rhodium complexes by ECD and VCD spectroscopy. Chirality 2010; 23:294-9. [DOI: 10.1002/chir.20916] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2009] [Accepted: 07/09/2010] [Indexed: 02/05/2023]
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26
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Vass E, Strijowski U, Wollschläger K, Mándity IM, Szilvágyi G, Jewgiński M, Gaus K, Royo S, Majer Z, Sewald N, Hollósi M. VCD studies on cyclic peptides assembled from L-α-amino acids and a trans-2-aminocyclopentane- or trans-2-aminocyclohexane carboxylic acid. J Pept Sci 2010; 16:613-20. [DOI: 10.1002/psc.1272] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Brem J, Toşa MI, Paizs C, Vass E, Irimie FD. Enzyme-catalyzed synthesis of (R)- and (S)-3-hydroxy-3-(10-alkyl-10H-phenothiazin-3-yl)propanoic acids. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.02.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bencze LC, Paizs C, Toşa MI, Vass E, Irimie FD. Synthesis of enantiomerically enriched (R)- and (S)-benzofuranyl- and benzo[b]thiophenyl-1,2-ethanediols via enantiopure cyanohydrins as intermediates. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.01.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Bodor N, Tóth-Sarudy E, Holm T, Pallagi I, Vass E, Buchwald P, Langel U. Novel, cell-penetrating molecular transporters with flexible backbones and permanently charged side-chains. J Pharm Pharmacol 2010; 59:1065-76. [PMID: 17725848 DOI: 10.1211/jpp.59.8.0003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Abstract
Various cell-penetrating peptides have been discovered recently that can translocate across plasma membranes and can even carry large cargo molecules into the cells. Because under physiological conditions most of these peptides carry considerable positive charges due to the presence of basic amino acids such as arginine, we decided to investigate whether molecular transporters composed of permanently charged side-chains also possess such cell penetrating ability. Arginine-rich oligomers that have a backbone with increased flexibility due to incorporation of non-α-amino acids (ε-aminocaproic acid) have been found to be effective molecular transporters. Here, we report the preparation of analogue structures by replacing the arginine residues with the quaternary form of a novel redox amino acid (Nys+) that contain a trigonelline moiety; it has already been shown possible to replace the original basic amino acid side-chain of neuropeptides without significant activity-loss due to the sufficiently close steric and electronic analogy between the new Nys+ and the original side-chains (in their protonated form, e.g., Arg+, Lys+). A nonamer analogue showed transporter activity resulting in increased cellular uptake in human carcinoma (HeLa) cells.
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Affiliation(s)
- N Bodor
- Center for Drug Discovery, University of Florida, Gainesville, FL 32610-0497, USA.
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Góbi S, Knapp K, Vass E, Majer Z, Magyarfalvi G, Hollósi M, Tarczay G. Is β-homo-proline a pseudo-γ-turn forming element of β-peptides? An IR and VCD spectroscopic study on Ac-β-HPro-NHMe in cryogenic matrices and solutions. Phys Chem Chem Phys 2010; 12:13603-15. [DOI: 10.1039/c0cp00145g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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31
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Vass E, Majer Z, Kőhalmy K, Hollósi M. Vibrational and chiroptical spectroscopic characterization of γ-turn model cyclic tetrapeptides containing two β-Ala residues. Chirality 2010; 22:762-71. [DOI: 10.1002/chir.20831] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Hetényi A, Tóth GK, Somlai C, Vass E, Martinek TA, Fülöp F. Stabilisation of Peptide foldamers in an aqueous medium by incorporation of azapeptide building blocks. Chemistry 2009; 15:10736-41. [PMID: 19746464 DOI: 10.1002/chem.200900724] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Anasztázia Hetényi
- Institute of Pharmaceutical Chemistry, University of Szeged, 6720 Szeged, Eötvös u. 6, Hungary
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Schreiner PR, Fokin AA, Reisenauer HP, Tkachenko BA, Vass E, Olmstead MM, Bläser D, Boese R, Dahl JEP, Carlson RMK. [123]Tetramantane: Parent of a New Family of σ-Helicenes. J Am Chem Soc 2009; 131:11292-3. [DOI: 10.1021/ja904527g] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peter R. Schreiner
- Institut für Organische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany, Department of Organic Chemistry, Kiev Polytechnic Institute, pr. Pobedy 37, 03056 Kiev, Ukraine, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary, Department of Chemistry, University of California, Davis, California 95616, Institut für Anorganische Chemie, Universität Essen-Duisburg, Universitätsstr. 5, 45117 Essen, Germany, and MolecularDiamond Technologies, Chevron
| | - Andrey A. Fokin
- Institut für Organische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany, Department of Organic Chemistry, Kiev Polytechnic Institute, pr. Pobedy 37, 03056 Kiev, Ukraine, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary, Department of Chemistry, University of California, Davis, California 95616, Institut für Anorganische Chemie, Universität Essen-Duisburg, Universitätsstr. 5, 45117 Essen, Germany, and MolecularDiamond Technologies, Chevron
| | - Hans Peter Reisenauer
- Institut für Organische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany, Department of Organic Chemistry, Kiev Polytechnic Institute, pr. Pobedy 37, 03056 Kiev, Ukraine, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary, Department of Chemistry, University of California, Davis, California 95616, Institut für Anorganische Chemie, Universität Essen-Duisburg, Universitätsstr. 5, 45117 Essen, Germany, and MolecularDiamond Technologies, Chevron
| | - Boryslav A. Tkachenko
- Institut für Organische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany, Department of Organic Chemistry, Kiev Polytechnic Institute, pr. Pobedy 37, 03056 Kiev, Ukraine, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary, Department of Chemistry, University of California, Davis, California 95616, Institut für Anorganische Chemie, Universität Essen-Duisburg, Universitätsstr. 5, 45117 Essen, Germany, and MolecularDiamond Technologies, Chevron
| | - Elemér Vass
- Institut für Organische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany, Department of Organic Chemistry, Kiev Polytechnic Institute, pr. Pobedy 37, 03056 Kiev, Ukraine, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary, Department of Chemistry, University of California, Davis, California 95616, Institut für Anorganische Chemie, Universität Essen-Duisburg, Universitätsstr. 5, 45117 Essen, Germany, and MolecularDiamond Technologies, Chevron
| | - Marilyn M. Olmstead
- Institut für Organische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany, Department of Organic Chemistry, Kiev Polytechnic Institute, pr. Pobedy 37, 03056 Kiev, Ukraine, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary, Department of Chemistry, University of California, Davis, California 95616, Institut für Anorganische Chemie, Universität Essen-Duisburg, Universitätsstr. 5, 45117 Essen, Germany, and MolecularDiamond Technologies, Chevron
| | - Dieter Bläser
- Institut für Organische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany, Department of Organic Chemistry, Kiev Polytechnic Institute, pr. Pobedy 37, 03056 Kiev, Ukraine, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary, Department of Chemistry, University of California, Davis, California 95616, Institut für Anorganische Chemie, Universität Essen-Duisburg, Universitätsstr. 5, 45117 Essen, Germany, and MolecularDiamond Technologies, Chevron
| | - Roland Boese
- Institut für Organische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany, Department of Organic Chemistry, Kiev Polytechnic Institute, pr. Pobedy 37, 03056 Kiev, Ukraine, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary, Department of Chemistry, University of California, Davis, California 95616, Institut für Anorganische Chemie, Universität Essen-Duisburg, Universitätsstr. 5, 45117 Essen, Germany, and MolecularDiamond Technologies, Chevron
| | - Jeremy E. P. Dahl
- Institut für Organische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany, Department of Organic Chemistry, Kiev Polytechnic Institute, pr. Pobedy 37, 03056 Kiev, Ukraine, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary, Department of Chemistry, University of California, Davis, California 95616, Institut für Anorganische Chemie, Universität Essen-Duisburg, Universitätsstr. 5, 45117 Essen, Germany, and MolecularDiamond Technologies, Chevron
| | - Robert M. K. Carlson
- Institut für Organische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany, Department of Organic Chemistry, Kiev Polytechnic Institute, pr. Pobedy 37, 03056 Kiev, Ukraine, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary, Department of Chemistry, University of California, Davis, California 95616, Institut für Anorganische Chemie, Universität Essen-Duisburg, Universitätsstr. 5, 45117 Essen, Germany, and MolecularDiamond Technologies, Chevron
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Mándity IM, Wéber E, Martinek TA, Olajos G, Tóth GK, Vass E, Fülöp F. Design of peptidic foldamer helices: a stereochemical patterning approach. Angew Chem Int Ed Engl 2009; 48:2171-5. [PMID: 19212995 DOI: 10.1002/anie.200805095] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Assembly language: The programmed sequences of stereochemical building blocks lead to novel biomimetic helices. The rational design approach offers new possibilities for creating periodic secondary structures.
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Affiliation(s)
- István M Mándity
- Institute of Pharmaceutical Chemistry, Universitiy of Szeged, 6720 Szeged, Eötvös u. 6, Hungary
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Mándity I, Wéber E, Martinek T, Olajos G, Tóth G, Vass E, Fülöp F. Design of Peptidic Foldamer Helices: A Stereochemical Patterning Approach. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200805095] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Brem J, Paizs C, Toşa MI, Vass E, Irimie FD. Enzyme-catalyzed synthesis of (R)- and (S)-3-heteroaryl-3-hydroxy-propanoic acids and their derivatives. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.02.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Laczkó I, Vass E, Soós K, Fülöp L, Zarándi M, Penke B. Aggregation of Aβ(1–42) in the presence of short peptides: conformational studies. J Pept Sci 2008; 14:731-41. [DOI: 10.1002/psc.990] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Mezo G, Czajlik A, Manea M, Jakab A, Farkas V, Majer Z, Vass E, Bodor A, Kapuvári B, Boldizsár M, Vincze B, Csuka O, Kovács M, Przybylski M, Perczel A, Hudecz F. Structure, enzymatic stability and antitumor activity of sea lamprey GnRH-III and its dimer derivatives. Peptides 2007; 28:806-20. [PMID: 17254668 DOI: 10.1016/j.peptides.2006.12.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2006] [Revised: 12/19/2006] [Accepted: 12/20/2006] [Indexed: 11/24/2022]
Abstract
Direct antitumor activity of sea lamprey (Petromyzon marinus) gonadotropin-releasing hormone III (Glp-His-Trp-Ser-His-Asp-Trp-Lys-Pro-Gly-NH(2); lGnRH-III) was described on several tumor cells. To improve the selectivity of antitumor effects without increasing the hormone releasing activity and to enhance the enzymatic stability, lGnRH-III dimers were prepared via disulfide bond formation. Our results demonstrate that the lGnRH-III dimer derivatives exhibited higher antiproliferative effect and enzymatic stability in comparison with the native lGnRH-III, while lower LH-releasing potency was determined. In order to find a correlation between the biological and structural features of these compounds, the conformation of lGnRH-III and its dimer derivatives was determined by ECD, VCD, FT-IR and (1)H NMR.
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Affiliation(s)
- Gábor Mezo
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Eötvös L. University, POB 32, 1518 Budapest 112, Hungary.
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Blume R, Hävecker M, Zafeiratos S, Teschner D, Vass E, Schnörch P, Knop-Gericke A, Schlögl R, Lizzit S, Dudin P, Barinov A, Kiskinova M. Monitoring in situ catalytically active states of Ru catalysts for different methanol oxidation pathways. Phys Chem Chem Phys 2007; 9:3648-57. [PMID: 17612729 DOI: 10.1039/b700986k] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One of the prerequisites for the detailed understanding of heterogeneous catalysis is the identification of the dynamic response of the catalyst surface under variable reaction conditions. The present study of methanol oxidation on different model Ru pre-catalysts, performed approaching the realistic catalytic reaction conditions, provides direct evidence of the significant effect of reactants' chemical potentials and temperature on the catalyst surface composition and the corresponding catalytic activity and selectivity. The experiments were carried out for three regimes of oxygen potentials in the 10(-1) mbar pressure range, combining in situ analysis of the catalyst surface by synchrotron-based photoelectron core level spectroscopy with simultaneous monitoring of the products released in the gas phase by mass spectroscopy. Metallic Ru with adsorbed oxygen and transient 'surface oxide', RuO(x), with varying x have been identified as the catalytically active states under specific reaction conditions, favouring partial or full oxidation pathways. It has been shown that the composition of catalytically active steady states, exhibiting different activity and selectivity, evolves under the reaction conditions, independent of the crystallographic orientation and the initial pre-catalyst chemical state, metallic Ru or RuO(2).
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Affiliation(s)
- R Blume
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
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Pohl G, Perczel A, Vass E, Magyarfalvi G, Tarczay G. A matrix isolation study on Ac-Gly–NHMe and Ac-l-Ala–NHMe, the simplest chiral and achiral building blocks of peptides and proteins. Phys Chem Chem Phys 2007; 9:4698-708. [PMID: 17700871 DOI: 10.1039/b705098d] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [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: 11/21/2022]
Abstract
The infrared absorption (IR) spectra of acetyl-N-methyl-glycine and acetyl-N-methyl-alanine have been recorded in dichloromethane and dimethyl sulfoxide-d(6) solution, as well as in Ar and Kr matrices. The spectra were assigned with the help of quantum chemical calculations. Based on the assignments of the matrix-isolation IR spectra, in line with theoretical predictions, two different hydrogen bonded conformers were identified, furthermore a third conformer is likely to be present, which cannot be unambiguously identified. In dichloromethane two conformers could be observed, while in dimethyl sulfoxide a single conformer could be identified. Vibrational circular dichroism (VCD) spectra of acetyl-N-methyl-l-alanine have also been recorded in solutions and matrices. These matrix-isolation VCD spectra not only support the assignments of the matrix-isolation IR spectra, but also demonstrate that these spectra can be interpreted much easier with the help of quantum chemical calculations than the VCD spectra recorded in solutions. It is also shown that the rotatory strength of some vibrational transitions changes rapidly as a function of the backbone torsional coordinates; hence the appearance of some regions in the VCD spectra is extremely dependent on any perturbations, e.g. weak intermolecular interactions.
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Affiliation(s)
- Gábor Pohl
- Structural Chemistry and Biology Laboratory, Institute of Chemistry, Eötvös University, Budapest, Hungary
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Martinek TA, Mándity IM, Fülöp L, Tóth GK, Vass E, Hollósi M, Forró E, Fülöp F. Effects of the Alternating Backbone Configuration on the Secondary Structure and Self-Assembly of β-Peptides. J Am Chem Soc 2006; 128:13539-44. [PMID: 17031967 DOI: 10.1021/ja063890c] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.9] [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: 11/29/2022]
Abstract
Heterochiral homo-oligomers with alternating backbone configurations were constructed by using the different enantiomers of the cis- and trans-2-aminocyclopentanecarboxylic acid (ACPC) monomers. Molecular modeling and the spectroscopic techniques (NMR, ECD, and VCD) unequivocally proved that the alternating heterochiral cis-ACPC sequences form an H10/12 helix, where extra stabilization can be achieved via the cyclic side chains. The ECD and TEM measurements, together with molecular modeling, revealed that the alternating heterochiral trans-ACPC oligomers tend to attain a polar-strand secondary structure in solution, which can self-assemble into nanostructured fibrils. The observations indicate that coverage of all the possible secondary structures (various helix types and strand-mimicking conformations) can be attained with the help of cyclic beta-amino acid diastereomers. A relationship has been established between the backbone chirality pattern and the prevailing secondary structure, which underlines the role of stereochemical control in the beta-peptide secondary structure design and may contribute to future biological applications.
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Affiliation(s)
- Tamás A Martinek
- Institute of Pharmaceutical Chemistry and Department of Medical Chemistry, University of Szeged, H-6701 Szeged, POB 427, Hungary
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Laczkó I, Váró G, Bottka S, Bálint Z, Illyés E, Vass E, Bertrand JR, Malvy C, Hollósi M. N-terminal acylation of the SV40 nuclear localization signal peptide enhances its oligonucleotide binding and membrane translocation efficiencies. Arch Biochem Biophys 2006; 454:146-54. [PMID: 16987492 DOI: 10.1016/j.abb.2006.08.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2006] [Revised: 08/09/2006] [Accepted: 08/11/2006] [Indexed: 10/24/2022]
Abstract
Octanoyl and palmitoyl groups were coupled to the N-terminus of an analog of the SV40 nuclear localization signal peptide, SV126-133(Ser128), to study the effect of the fatty acid chain length on the complex formation with a single-stranded antisense oligodeoxynucleotide (ODN) and on the cellular uptake of the complex. The strongest binding affinity was observed for the palmitoylated peptide, indicating the better accessibility of the positively charged lysyl and arginyl side-chains to the phosphate groups due to the turn structures stabilized by the palmitoyl group. On increase of the peptide to ODN molar ratio (rM), gradual unstacking of the bases was observed, the maximal rate being reached at rM=10. At rM>10 restacking of the nucleotide bases was detected and the ODN was completely encapsulated in a liposome-like structure made up of palmitoylated peptides. Cell translocation experiments revealed a highly efficient cell transport of the ODN by palmitoylated SV40 peptide at rM>10.
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Affiliation(s)
- Ilona Laczkó
- Institute of Biophysics, Biological Research Center, Szeged, Hungary.
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Malešević M, Majer Z, Vass E, Huber T, Strijowski U, Hollósi M, Sewald N. Spectroscopic Detection of Pseudo-Turns in Homodetic Cyclic Penta- and Hexapeptides Comprising β-Homoproline. Int J Pept Res Ther 2006. [DOI: 10.1007/s10989-006-9013-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Tarczay G, Magyarfalvi G, Vass E. Towards the Determination of the Absolute Configuration of Complex Molecular Systems: Matrix Isolation Vibrational Circular Dichroism Study of (R)-2-Amino-1-propanol. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200503319] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Tarczay G, Magyarfalvi G, Vass E. Towards the Determination of the Absolute Configuration of Complex Molecular Systems: Matrix Isolation Vibrational Circular Dichroism Study of (R)-2-Amino-1-propanol. Angew Chem Int Ed Engl 2006; 45:1775-7. [PMID: 16477663 DOI: 10.1002/anie.200503319] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- György Tarczay
- Institute of Chemistry, Eötvös University, Budapest, Hungary.
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Vass E, Hollósi M, Forró E, Fülöp F. VCD spectroscopic investigation of enantiopure cyclic β-lactams obtained through lipolase-catalyzed enantioselective ring-opening reaction. Chirality 2006; 18:733-40. [PMID: 16856169 DOI: 10.1002/chir.20312] [Citation(s) in RCA: 7] [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: 11/09/2022]
Abstract
A direct enzymatic method for the preparation of cyclic beta-lactams and beta-amino acids was recently developed, involving the Lipolase-catalyzed enantioselective hydrolysis of racemic beta-lactams in an organic solvent. Vibrational circular dichroism (VCD) spectroscopy combined with quantum chemical calculations at ab initio (DFT) level of theory has now been applied to determine the absolute configuration and conformation of a series of cyclic beta-lactams (1-10). The absolute configuration of 8 was derived from X-ray crystallography. Only indirect evidence was available for 1, 2, 5, 6, and 7. The absolute configuration of the new lactams 3, 4, 9, and 10 was not known previously. The VCD analysis indicated the homochirality of the studied lactams. The conformation of the flexible beta-lactams was also predicted from the VCD data. Even in the cases where multiple conformers are allowed, the predominance of one conformer was found, with the exception of 2, being present as a mixture of four conformers. Beta-lactams tend to form H-bonded dimers. The fine structure of the amide I VCD band suggested that only a small population of H-bonded dimers is formed in deuterated chloroform.
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Affiliation(s)
- Elemér Vass
- Eötvös Loránd University, Institute of Chemistry, Department of Organic Chemistry, Budapest, Hungary.
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47
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Farkas V, Vass E, Hanssens I, Majer Z, Hollósi M. Cyclic peptide models of the Ca2+-binding loop of alpha-lactalbumin. Bioorg Med Chem 2005; 13:5310-20. [PMID: 16046135 DOI: 10.1016/j.bmc.2005.06.040] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2005] [Revised: 06/08/2005] [Accepted: 06/09/2005] [Indexed: 10/25/2022]
Abstract
A series of cyclic peptides with different linkers were designed and synthesized to model the elbow-type Ca2+-binding loop of alpha-lactalbumin (LA). All amino acids of the Ca2+-binding loop are strikingly well conserved among LAs of different species with the sequence Lys79-Phe-Leu-Asp82-Asp-Asp-Leu-Thr- Asp87-Asp88, where three carboxylates of Asp82, Asp87, and Asp88 and the amide carbonyl oxygen atoms of Lys79 and Asp84 participate in Ca2+ binding. Alanine-containing models were also prepared for monitoring the role of the binding (82, 87-88) and nonbinding Asp residues (83-84) in coordinating the cation. The structural features of synthetic peptides and their Ca2+-binding properties were investigated in solution by circular dichroism (CD) and Fourier transform infrared (FTIR) spectroscopy. In water, the CD curves show a strong negative band below 200 nm as a sign of the presence of unfolded conformers. In TFE, all cyclic peptides were found to have a CD spectrum, reflecting the presence of folded (turn) conformers. The effect of Ca2+ was dependent on the structure and concentration of the model and the Ca2+ to peptide ratio (r(cat)). A surprising time dependence of the FTIR spectra of Ca2+ complexes of the Ala-containing peptides was observed. The shape of the broad amide I band showed no more change after approximately 60 min. Contrary to this, the deprotonation of the side chain COOH group(s) and formation of the final coordination sphere of Ca2+ took more time. Infrared spectra showed that in the Ca2+ complex of model comprising the binding Asp residues of LA, the cation is coordinated to the COO- groups of all three Asps, while in the complex of model comprising nonbinding Asp residues of LA, the two neighboring Asp side chains form a bridged Ca2+-binding system.
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Affiliation(s)
- Viktor Farkas
- Department of Organic Chemistry, Eötvös Loránd University, PO Box 32, H-1518 Budapest 112, Hungary
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Sohár P, Csámpai A, Abrán Á, Túrós G, Vass E, Kudar V, Újszászy K, Fábián B. Macrocyclic Double Ferrocenes, Their Stereostructure, and an IR and NMR Spectroscopic, X-ray Crystallographic, and Conformational and Dynamic Investigation. European J Org Chem 2005. [DOI: 10.1002/ejoc.200400628] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Szarvas S, Szalay L, Vass E, Hollósi M, Samu E, Huszthy P. Chiroptical properties of cation complexes of chiral phenazino-18-crown-6 ether-type hosts. Chirality 2005; 17:345-51. [PMID: 15858830 DOI: 10.1002/chir.20162] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Herein we report CD spectroscopic studies on complexes of (R,R)-dimethyl-, (R,R)-diisobutyl-, and (S,S)-di-sec-butyl-phenazino-18-crown-6 ligands (Scheme 1) with selected alkali (Na+, K+), alkaline earth (Mg2+, Ca2+), and transition-metal (Ag+, Zn2+, Ni2+, Cd2+, Pb2+) cations. The complexation was monitored in the 300- to 240-nm region of the CD spectra comprising mainly the 1Bb band of the heteroaromatic subunit. The CD spectra of the complexes showed an unexpected diversity. In the most characteristic 1Bb spectral region, the number, position, and intensity of band(s) depend not only on the heteroaromatic subunit and the size of the substituents but also on the diameter, ion strength, and coordination geometry of the cation. The appearance of two weak 1Bb CD bands (type-I spectra) with the sign pattern of the host is an indication of two complexes of comparable stability. The "type-II" spectra differ from that of the host in the number, sign pattern, and intensity of the bands. Complexes of transition-metal cations generally show CD spectra with more intense bands. The CD spectra of complexes of (S,S)-di-sec-butyl-phenazino-18-crown-6 ligand with Na+, K+, and Pb2+ (type III) strongly suggest exciton coupling caused by the closeness of the heteroaromatic rings of two 1:1 complex molecules.
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Affiliation(s)
- Szilvia Szarvas
- Department of Organic Chemistry, Eötvös Loránd University, Budapest, Hungary
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Nappi AJ, Vass E, Malagoli D, Carton Y. The effects of parasite-derived immune-suppressive factors on the cellular innate immune and autoimmune responses of Drosophila melanogaster. J Parasitol 2004; 90:1139-49. [PMID: 15562616 DOI: 10.1645/ge-266r] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Immune-suppressive factors (ISFs) introduced into larvae of Drosophila melanogaster during infection by virulent endoparasitic wasps effectively block the innate immune response mediated by blood cells (hemocytes) but have little influence on the autoimmune response made by a tumor strain in which the blood cells manifest a similar response but instead target and destroy endogenous tissues. Quantitative hemocyte analyses indicate that ISFs interfere with the immune effector responses downstream of nonself recognition, hemocyte activation and differentiation, because these responses were manifested by tumor hosts, in which the parasitoids developed. The data suggest that once activated to encapsulate aberrant tissues, the target specificity of the autoimmune-activated hemocytes, and the genetic program underlying tumor formation, cannot be blocked by parasitoid-derived ISFs, which effectively inhibit identical hemocyte-mediated responses during parasitization.
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Affiliation(s)
- A J Nappi
- Department of Animal Health and Biomedical Sciences, University of Wisconsin, Madison, Wisconsin 53706, USA.
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