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Herzog S, Gustav K, Krüger E, Oberender H, Schuster R. Tetrahydrofuranaddukte einiger Schwermetallhalogenide. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19630031110] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Herzog S, Pahl S, Kalies W. Ein Additionsprodukt des Kupfer(II)-acetats mit 2,2′-Dipyridyl: Di-acetato-2,2′-Dipyridyl-Kupfer(II). ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19630031016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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53
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Herzog S, Präkel H. Über das Verhalten des Komplextyps [MeDipy3]2+ gegenüber Lithiumalanat. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19650051229] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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54
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Herzog S, Aul H. Über elektronenreiche Komplexe des Vanadins mit 2, 2′, 2″-Tripyridyl. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19660060913] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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55
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Herzog S, Präkel H. Über die Entladung des [FeDipy3]2+-Kations zum Tris-2,2′-Dipyridyl-eisen [FeDipy3]. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19650051227] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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56
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Herzog S, Oberender H, Pahl S. Ein neues Additionsprodukt des Chrom (II)-acetats: Diacetato-dipyridyl-bis-isopropylamin-chrom (II) [CrDipy(IPA)2(CH3COO)2]. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19630030306] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Herzog S, Schmidt M. Über das Lithium-tris-2,2′-Dipyridyl-manganat(-I) Li[MnDipy3] · 4THF. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19630031014] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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59
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König E, Schläfer HL, Herzog S. Zur Methodik der Absorptions- und Reflexionsspektroskopie extrem sauerstoffempfindlicher Verbindungen. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19640040303] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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60
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Herzog S, Oberender H, Berger R. Eine rationelle anaerobe Arbeitsmethode. Das Arbeiten in flüssigem Ammoniak. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19650051004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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61
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Herzog S, Kalies W. Darstellung und Eigenschaften einiger Chrom(II)-n-alkanate; II. Hydrate des Chrom(II)-formiats [1]. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19640040509] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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62
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Herzog S, Gutsche E. Substitutionsversuche an Neutralkomplexen des 2,2′-Dipyridyls. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19630031015] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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63
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Herzog S, Grimm U. Über die Darstellung und Entladung des Tris-2,2′-Dipyridyl-zink-jodids. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19630030116] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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64
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Herzog S, Oberender H. Über einen Neutralkomplex des Urans mit 2,2′-Dipyridyl: Tetrakis-2,2′-Dipyridyl-uran(O) U(Dipy)4 [1]. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19630031111] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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65
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Herzog S, Kalies W. Neue Chrom(II)-verbindungen mit anomalen magnetischen Eigenschaften. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19660060914] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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66
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Herzog S, Klausch U, Lantos J. Über die Darstellung von Tris-2,2′-Dipyridyl-kobalt(0) [CoDipy3]. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19640040412] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Herzog S, Berger R. Über neue Additionsprodukte des Calciums und Strontiums mit 2, 2′-Dipyridyl: Tetrakis-2,2′-Dipyridyl-calcium, CaDipy4, und Tetrakis-2,2′-Dipyridyl-strontium, SrDipy4 [1]. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19660061126] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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69
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Herzog S, Schuster R. Zur Darstellung elektronenreicher Verbindungen der Lanthanidenelemente Cer, Neodym und Ytterbium mit 2,2×-Dipyridyl. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19670070125] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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70
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Herzog S, Kalies W. Darstellung und Eigenschaften einiger Chrom(II)-n-alkanate III. Wasserfreies Chrom(II)-formiat. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19650050711] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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71
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Herzog S, Berger R. Über ein Additionsprodukt des Bariums mit 2,2′-Dipyridyl: Tetrakis-2,2′-Dipyridyl-barium, BaDipy4 [1]. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19650050709] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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72
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Herzog S, Wegewijs MR. Dzyaloshinskii-Moriya interaction in transport through single-molecule transistors. NANOTECHNOLOGY 2010; 21:274010. [PMID: 20571197 DOI: 10.1088/0957-4484/21/27/274010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The Dzyaloshinskii-Moriya interaction is shown to result in a canting of spins in a single-molecule transistor. We predict nonlinear transport signatures of this effect induced by spin-orbit coupling for the generic case of a molecular dimer. The conductance is calculated using a master equation and is found to exhibit a non-trivial dependence on the magnitude and direction of an external magnetic field. We show how three-terminal transport measurements allow for a determination of the coupling vector characterizing the Dzyaloshinskii-Moriya interaction. In particular, we show how its orientation, defining the intramolecular spin chirality, can be probed with ferromagnetic electrodes.
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Jacobsen B, Algermissen D, Schaudien D, Venner M, Herzog S, Wentz E, Hewicker-Trautwein M, Baumgärtner W, Herden C. Borna disease in an adult alpaca stallion (Lama pacos). J Comp Pathol 2010; 143:203-8. [PMID: 20153871 DOI: 10.1016/j.jcpa.2010.01.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2009] [Revised: 11/02/2009] [Accepted: 01/06/2010] [Indexed: 11/29/2022]
Abstract
Borna disease (BD) was diagnosed in a 2-year-old male alpaca with a history of chronic suppressed sexual desire and acute stretching convulsions. Microscopical examination of the central nervous system revealed non-purulent meningoencephalitis with mononuclear perivascular cuffing. The diagnosis was confirmed by immunohistochemistry, in-situ hybridization, polymerase chain reaction (PCR) and sequencing of PCR products and alignment with known Borna disease virus sequences. Serological screening of the herd was performed. This is the first detailed report of naturally occurring BD in alpacas.
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Bechter K, Reiber H, Herzog S, Fuchs D, Tumani H, Maxeiner H. P03-76 - Mild encephalitis inflammation subgroups in affective and schizophrenic disorders. Eur Psychiatry 2010. [DOI: 10.1016/s0924-9338(10)71186-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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75
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Lierz M, Herden C, Herzog S, Piepenbring A. [Proventricular dilatation disease and Avian Bornavirus as a possible cause]. TIERARZTLICHE PRAXIS. AUSGABE K, KLEINTIERE/HEIMTIERE 2010; 38:87-94. [PMID: 22331308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 02/24/2010] [Accepted: 02/09/2010] [Indexed: 05/31/2023]
Abstract
OBJECTIVE Proventricular Dilatation Disease (PDD) is a very important letal disease in parrots. It affects several psittacine species and is a high risk factor for the health of breeding collections, but is rarely observed in other avian families. To date, the etiology of the disease remained unclear, though a virus infection was always assumed. Recently, a novel virus (Avian Bornavirus [ABV]) was discovered in parrots suffering from PDD so that ABV is now considered as the most likely cause. Despite the fact that clinically healthy birds may be infected with ABV, several studies demonstrate a correlation between ABV-infection and clinically present PDD. Apart from direct virus detection, serological methods allow the demonstration of an infection. CONCLUSIONS Currently, Avian Bornavirus is the leading candidate as the aetiologic agent of PDD. Breeding collections and birds planned to be introduced into collections should therefore be investigated by molecular biological and serological methods for the presence of an ABV-infection. The diagnostic value of the demonstration of an ABV-infection for the diagnosis of a clinically present PDD has to be investigated further.
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Schrader WF, Herzog S. [Circumscribed retinal detachment after radial optic neurotomy for central retinal vein occlusion]. Ophthalmologe 2009; 106:1022-3. [PMID: 19499226 DOI: 10.1007/s00347-009-1982-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
OBJECTIVE It has been suggested that radial optic neurotomy (RON) may improve the functional outcome of retinal vein occlusions. We report the case of a patient presenting with a high, but circumscribed, peripapillary retinal detachment following RON for central retinal vein occlusion. RESULTS A 69-year-old man presented with a high retinal detachment 2.5 years after RON for central retinal vein occlusion. It was complicated by a recurring cystoid macular edema; however, best visual acuity was 0.5. The retinal detachment developed slowly. Its location was nasal and superior to the optic disc. It did not extend beyond the equator and had no detectable retinal break. The retinal detachment was successfully treated by an encircling band, pars plana vitrectomy, laser coagulation, and air endotamponade. There was no obvious persisting retinal defect at the RON site. CONCLUSIONS Although other mechanisms should be taken into account, this case indicates that it might be possible to create a fistula between the subarachnoid and subretinal space, leading to a slowly developing retinal detachment. A similar case report pointed out that special attention should be paid to the depth of the radial incision into the optic nerve head.
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Abstract
A study of 15 blood protein systems in fallow deer, Cervus dama L., has revealed a transferrin polymorphism in two German populations for the first time in this species. Genetic analysis of complete families suggests that the transferrin system is controlled by one gene locus with two codominant alleles. The comparison of the present results with other studies on this species leads to the hypothesis that at least the European mainland fallow deer populations are genetically more differentiated than previously assumed.
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Herzog S. Polymorphism and genetic control of erythrocyte 6-phosphogluconate dehydrogenase in the genus Cervus. Anim Genet 2009; 19:291-4. [PMID: 3207221 DOI: 10.1111/j.1365-2052.1988.tb00818.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A study of 11 enzyme systems in blood samples of Cervus dama, C. elaphus, C. nippon and hybrids C. elaphus X nippon has revealed an erythrocyte 6-phosphogluconate dehydrogenase polymorphism in the hybrid populations. Genetic analysis suggests that this enzyme is controlled by one gene locus with two codominant alleles, one specific for pure Japanese sika deer, the other for pure red deer as well as for fallow deer, while both alleles have been found in the red X sika hybrids.
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Kashif M, Hellweg A, Thati M, Herzog S, Vinnikov I, Shahzad K, Nawroth P, Isermann B. O17 The transcription factor NFE2 regulates trophoblast differentiation. Thromb Res 2009. [DOI: 10.1016/s0049-3848(09)70042-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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80
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Werner-Keišs N, Garten W, Richt JA, Porombka D, Algermissen D, Herzog S, Baumgärtner W, Herden C. Restricted expression of Borna disease virus glycoprotein in brains of experimentally infected Lewis rats. Neuropathol Appl Neurobiol 2008; 34:590-602. [DOI: 10.1111/j.1365-2990.2008.00940.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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81
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Mann C, Held U, Herzog S, Bänziger O. Ursachen der postoperativen Azidose – neue Einsichten mit dem Säure-Basen-Modell nach Stewart. Z Geburtshilfe Neonatol 2008. [DOI: 10.1055/s-2008-1078797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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82
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Herzog S, Engel J, Vinnikov I, Madhusudhan T, Muhammed K, Blessing E, Nawroth PP, Isermann B. Differentielle Effekte der prothrombotischen Mutation (TMPro/Pro) in der Atherosklerose in hypercholesterinämischen und diabetischen Mäusen. DIABETOL STOFFWECHS 2008. [DOI: 10.1055/s-2008-1076331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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83
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Herzog S, Herden C, Frese K, Lange-Herbst H, Grabner A. Borna disease virus infection of horses: contradictory results between antemortem and postmortem investigations. PFERDEHEILKUNDE 2008. [DOI: 10.21836/pem20080603] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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84
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Spuhl O, Herzog S, Arlt W, Groß J. Stoffdatenberechnung für moderne Industrieprozesse. CHEM-ING-TECH 2007. [DOI: 10.1002/cite.200750407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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85
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Isermann B, Blautzik J, Vinnikov I, Herzog S, Weiler H, Bierhaus A, Nawroth P. THE THROMBOMODULIN PROTEIN C SYSTEM PROTECTS AGAINST DIABETIC NEUROPATHY VIA TWO INDEPENDENT MECHANISMS. J Thromb Haemost 2007. [DOI: 10.1111/j.1538-7836.2007.tb00998.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Isermann B, Vinnikov I, Hummel B, Madhusudhan T, Kashif M, Herzog S, Bierhaus A, Nawroth P. FACTOR V LEIDEN PROTECTS AGAINST DIABETIC NEPHROPATHY IN MICE. J Thromb Haemost 2007. [DOI: 10.1111/j.1538-7836.2007.tb00947.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Isermann B, Vinnikov I, Hummel B, Madhusudhan T, Kashif M, Herzog S, Linn T, Bierhaus A, Nawroth PP. Faktor V Leiden schützt vor diabetischer Nephropathie in Mäusen. DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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88
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Isermann B, Blautzik J, Vinnikov I, Herzog S, Weiler H, Linn T, Bierhaus A, Nawroth PP. Das endotheliale Thrombomodulin Protein C System schützt vor der diabetischen Neuropathie durch zwei unabhängige Mechanismen. DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Shimanovich I, Herzog S, Schmidt E, Opitz A, Klinker E, Bröcker EB, Goebeler M, Zillikens D. Improved protocol for treatment of pemphigus vulgaris with protein A immunoadsorption. Clin Exp Dermatol 2006; 31:768-74. [PMID: 16824051 DOI: 10.1111/j.1365-2230.2006.02220.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Pemphigus vulgaris is a life-threatening autoimmune blistering skin disease, usually treated with high-dose corticosteroids in combination with other immunosuppressants. However, this regimen may prove inadequate in severe cases and can cause dangerous side-effects. We have recently reported protein A immunoadsorption (PAIA) to be an effective adjuvant treatment for induction of remission in severe pemphigus. However, in a significant number of cases, the disease rapidly recurred once PAIA and immunosuppressive medication were tapered. AIMS The aim of the present study was to develop a PAIA-based therapeutic regimen that would result in a more prolonged remission of pemphigus. METHODS Nine patients with pemphigus vulgaris were treated with a modified protocol characterized by a combination of PAIA with a higher initial dose of systemic methylprednisolone (2 mg/kg). In addition, azathioprine or mycophenolate mofetil was administered as a steroid-sparing agent. RESULTS In all nine patients treated with this regimen, we observed a sharp decline of circulating autoantibody levels and dramatic improvement of cutaneous and mucosal lesions within 4 weeks of therapy. The patients remained free of clinical disease for up to 26 months after PAIA treatment was discontinued. CONCLUSION The improved treatment protocol appears to combine highly effective induction of clinical remission in severe or treatment-resistant pemphigus with a prolonged subsequent symptom-free interval.
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Gesierich A, Herzog S, Grunewald SM, Tappe D, Bröcker EB, Schön MP. Eosinophilic folliculitis in a Caucasian patient: association with toxocariasis? J Eur Acad Dermatol Venereol 2006; 20:1317-21. [PMID: 17062052 DOI: 10.1111/j.1468-3083.2006.01762.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Sterile eosinophilic folliculitis, a clinical entity first described by Ofuji in 1970, is a rather rare skin disorder, in particular in the non-Asian population. We report the first case of eosinophilic folliculitis associated with toxocariasis in a Caucasian patient. Topical and systemic anti-inflammatory and antiphlogistic therapy along with systemic antihelminthic treatment resulted in complete remission of the skin lesions. In addition, there was a marked decrease of antibodies to Toxocara antigens in the patient's serum following antihelminthic therapy. Given that (I) some cases of eosinophilic folliculitis have been reported which were associated with infestation with metazoan parasites; (2) infestations with the roundworm Toxocara canis are known to induce eosinophilic reactions in some tissues; and (3) therapy-induced remission of eosinophilic folliculitis was accompanied by a decrease of Toxocara-directed antibodies in the patient's serum, we propose that there is an aetiopathogenic link between toxocariasis and eosinophilic folliculitis in this patient.
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Brummer T, Martin P, Herzog S, Misawa Y, Daly RJ, Reth M. Functional analysis of the regulatory requirements of B-Raf and the B-Raf(V600E) oncoprotein. Oncogene 2006; 25:6262-76. [PMID: 16702958 DOI: 10.1038/sj.onc.1209640] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The BRAF(V600E) mutation is found in approximately 6% of human cancers and mimics the phosphorylation of the kinase domain activation segment. In wild-type B-Raf (B-Raf(wt)), activation segment phosphorylation is thought to cooperate with negative charges within the N-region for full activation. In contrast to Raf-1, the N-region of B-Raf is constitutively negatively charged owing to the presence of residues D447/D448 and the phosphorylation of S446. Therefore, it has been suggested that this hallmark predisposes B-Raf for oncogenic activation. In this study, we demonstrate that neutralizing mutations of these residues (in particular S446 and S447), or uncoupling of B-Raf from Ras-guanine 5'-triphosphate (GTP), strongly reduce the biological activity of B-Raf in a PC12 cell differentiation assay. We also confirm that S365 is a 14-3-3 binding site, and determine that mutation of this residue rescues the impaired biological activity of B-Raf proteins with a neutralized N-region, suggesting that the N-region opposes a 14-3-3-mediated transition into an inactive conformation. However, in the case of B-Raf(V600E), although complete N-region neutralization resulted in a 2.5-fold reduction in kinase activity in vitro, this oncoprotein strongly induced PC12 differentiation or transformation and epithelial-mesenchymal transition of MCF-10A cells regardless of its N-region charge. Furthermore, the biological activity of B-Raf(V600E) was independent of its ability to bind Ras-GTP. Our analysis identifies important regulatory differences between B-Raf(wt) and B-Raf(V600E) and suggests that B-Raf(V600E) cannot be inhibited by strategies aimed at blocking S446 phosphorylation or Ras activation.
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Klein F, Feldhahn N, Herzog S, Sprangers M, Mooster JL, Jumaa H, Müschen M. BCR-ABL1 induces aberrant splicing of IKAROS and lineage infidelity in pre-B lymphoblastic leukemia cells. Oncogene 2006; 25:1118-24. [PMID: 16205638 DOI: 10.1038/sj.onc.1209133] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Pre-B lymphoblastic leukemia cells carrying a BCR-ABL1 gene rearrangement exhibit an undifferentiated phenotype. Comparing the genome-wide gene expression profiles of normal B-cell subsets and BCR-ABL1+ pre-B lymphoblastic leukemia cells by SAGE, the leukemia cells show loss of B lymphoid identity and aberrant expression of myeloid lineage-specific molecules. Consistent with this, BCR-ABL1+ pre-B lymphoblastic leukemia cells exhibit defective expression of IKAROS, a transcription factor needed for early lymphoid lineage commitment. As shown by inducible expression of BCR-ABL1 in human and murine B-cell precursor cell lines, BCR-ABL1 induces the expression of a dominant-negative IKAROS splice variant, termed IK6. Comparing matched leukemia sample pairs from patients before and during therapy with the BCR-ABL1 kinase inhibitor STI571 (Imatinib), inhibition of BCR-ABL1 partially corrected aberrant expression of IK6 and lineage infidelity of the leukemia cells. To elucidate the contribution of IK6 to lineage infidelity in BCR-ABL1+ cell lines, IK6 expression was silenced by RNA interference. Upon inhibition of IK6, BCR-ABL1+ leukemia cells partially restored B lymphoid lineage commitment. Therefore, we propose that BCR-ABL1 induces aberrant splicing of IKAROS, which interferes with lineage identity and differentiation of pre-B lymphoblastic leukemia cells.
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93
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Sprangers M, Feldhahn N, Herzog S, Hansmann ML, Reppel M, Hescheler J, Jumaa H, Siebert R, Müschen M. The SRC family kinase LYN redirects B cell receptor signaling in human SLP65-deficient B cell lymphoma cells. Oncogene 2006; 25:5056-62. [PMID: 16568084 DOI: 10.1038/sj.onc.1209510] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
SLP65 represents a critical component in (pre-) B cell receptor signal transduction but is compromised in a subset of pre-B cell-derived acute lymphoblastic leukemia. Based on these findings, we investigated (i.) whether SLP65-deficiency also occurs in mature B cell-derived lymphoma and (ii.) whether SLP65-deficient B cell lymphoma cells use an alternative B cell receptor signaling pathway in the absence of SLP65. Indeed, expression of SLP65 protein was also missing in a fraction of B cell lymphoma cases. While SLP65 is essential for B cell receptor-induced Ca2+ mobilization in normal B cells, B cell receptor engagement in SLP65-deficient as compared to SLP65-reconstituted B cell lymphoma cells resulted in an accelerated yet shortlived Ca2+-signal. B cell receptor engagement of SLP65-deficient lymphoma cells involves SRC kinase activation, which is critical for B cell receptor-dependent Ca2+-mobilisation in the absence but not in the presence of SLP65. As shown by RNA interference, the SRC kinase LYN is required for B cell receptor-induced Ca2+ release in SLP65-deficient B cell lymphoma cells but dispensable after SLP65-reconstitution. B cell receptor engagement in SLP65-deficient B cell lymphoma cells also resulted in tyrosine-phosphorylation of the proliferation- and survival-related MAPK1 and STAT5 molecules, which was sensitive to silencing of the SRC kinase LYN. Inhibition of SRC kinase activity resulted in growth arrest and cell death specifically in SLP65-deficient lymphoma cells. These findings indicate that LYN can short-circuit conventional B cell receptor signaling in SLP65-deficient B cell lymphoma cells and thereby promote activation of survival and proliferation-related molecules.
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94
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Helwig P, Faust G, Hindenlang U, Herzog S, Südkamp N, Kröplin B. Complete muscle-model of the femur: numerical simulation and validation. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)85694-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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95
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Herzog S, Vinnikov I, Thati M, Huntscha S, Chavakis T, Weiler H, Bierhaus A, Nawroth PP, Isermann B. Das endotheliale Thrombomodulin Protein C System schützt vor diabetischer Mikroangioapthie und diabetischer Nephropathie. DIABETOL STOFFWECHS 2006. [DOI: 10.1055/s-2006-943840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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96
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Ewers A, Osterbrink J, Maier C, Nestler N, Herzog S, Klostermann J. [Patients should not suffer pain]. PFLEGE AKTUELL 2005; 59:666-9. [PMID: 16366027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
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97
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Schmidt E, Herzog S, Bröcker EB, Zillikens D, Goebeler M. Long-standing remission of recalcitrant juvenile pemphigus vulgaris after adjuvant therapy with rituximab. Br J Dermatol 2005; 153:449-51. [PMID: 16086770 DOI: 10.1111/j.1365-2133.2005.06740.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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98
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Herzog S, Geisler K, Präkel H. A Neutral Complex of Aluminum with 2,2′-Bipyridyl. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/anie.196300473] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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99
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Goebeler M, Herzog S, Bröcker EB, Zillikens D. Rapid response of treatment-resistant pemphigus foliaceus to the anti-CD20 antibody rituximab. Br J Dermatol 2003; 149:899-901. [PMID: 14616397 DOI: 10.1046/j.1365-2133.2003.05580.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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100
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Schmidt E, Klinker E, Opitz A, Herzog S, Sitaru C, Goebeler M, Mansouri Taleghoni B, Bröcker EB, Zillikens D. Protein A immunoadsorption: a novel and effective adjuvant treatment of severe pemphigus. Br J Dermatol 2003; 148:1222-9. [PMID: 12828752 DOI: 10.1046/j.1365-2133.2003.05302.x] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Pemphigus foliaceus (PF) and pemphigus vulgaris (PV) are autoimmune blistering skin diseases usually treated with high-dose systemic corticosteroids and other immunosuppressants that may cause severe side-effects. Plasmapheresis also has been demonstrated to be of benefit in the treatment of pemphigus. In contrast to plasmapheresis, staphylococcal protein A immunoadsorption (PA-IA) specifically removes immunoglobulin from the circulation, allows treatment of larger plasma volumes, and does not require the substitution of plasma components. OBJECTIVES To determine the effectiveness and side-effects of PA-IA in patients with severe pemphigus. METHODS Five patients with severe pemphigus (PV, n = 4; PF, n = 1) were treated by PA-IA. Three of these patients had been refractory to various treatment regimens. In addition to PA-IA, methylprednisolone, 0.5 mg x kg-1 body weight day-1 was given initially and subsequently tapered. RESULTS In all patients, a dramatic clinical improvement was seen within 2 weeks after initiation of therapy. Patients were free of lesions after 3, 4, 4, 10 and 21 weeks of treatment, respectively. Concurrently, autoantibody levels decreased rapidly. CONCLUSIONS PA-IA is a rational, effective, and safe adjuvant therapy for severe pemphigus and warrants wider use for this indication. A controlled study should compare side-effects and effectiveness of PA-IA with other treatment options for pemphigus.
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