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Hoonpongsimanont W, Sahota P, Mobayed O, Danishgar L, Ghanem G, Hoffmann J, Saadat S, Lotfipour S. 335 Correlation Between a Direct Alcohol Biomarker, Phosphatidylethanol, and the Alcohol Use Disorders Identification Test. Ann Emerg Med 2018. [DOI: 10.1016/j.annemergmed.2018.08.340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Tsvetkova Y, Green C, Schuetz G, Hoffmann J, Zopf D, Lejeune P. Comparative assessment of orthotopic brain tumor growth using bioluminescence and magnetic resonance imaging. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy273.385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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53
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Hoffmann J, Hanstein S, Hubert C, Stauber R. Extraktion und Modifikation von verzweigten β
-Glykanen aus Fruchtresten als Rohstoffquelle für biobasierte Beschichtungen. CHEM-ING-TECH 2018. [DOI: 10.1002/cite.201855048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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54
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Hoffmann J, Mas Peiro S, Boeckling F, Rasper T, Dimmeler S, Fichtlscherer S, Zeiher AM, Vasa-Nicotera M. P4502Phenotypic characterization of the early cellular inflammatory responses in patients undergoing transfemoral transcatheter aortic valve implantation. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p4502] [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: 11/14/2022] Open
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Hoffmann J, Rieth M, Klimenkov M, Baumgärtner S. Improvement of EUROFER's mechanical properties by optimized chemical compositions and thermo-mechanical treatments. NUCLEAR MATERIALS AND ENERGY 2018. [DOI: 10.1016/j.nme.2018.05.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Markwardt F, Nowak G, Hoffmann J. Comparative Studies on Thrombin Inhibitors in Experimental Microthrombosis. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1657370] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
SummaryThe influence of thrombin inhibitors, which differ both in their chemical structure and type of inhibition on thrombin-induced microthrombosis was studied in rat lungs. The antithrombotically effective doses and blood levels of the compounds correlated with their kinetic constants for inhibition of thrombin. In preventing microthrombosis, some of the synthetic inhibitors tested surpassed the effectiveness of heparin and approached that of the naturally occurring inhibitor hirudin.
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Hoffmann J, Exner M, Bremicker K, Stumpp P, Stepan H. Mögliche Antworten auf alte Fragen: Eine MRT-Studie des unteren Uterinsegments. Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1660604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Hoffmann J, Exner M, Bremicker K, Stepan H. Evaluation der Diagnostik des unteren Uterinsegments bei Status nach Sectio mittels MRT. Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1645913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Feldmann C, Walter C, Chatterjee A, Dogan G, Hanke J, Reiss N, Schmitz T, Hoffmann J, Fischer F, Haverich A, Schmitto J. Expert Interviews: Infrastructural Needs and Expected Benefits of Telemonitoring in VAD Therapy. Thorac Cardiovasc Surg 2018. [DOI: 10.1055/s-0038-1628101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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60
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Seitz M, Hoffmann J, Rieth M, Margraf P, Senn R, Klimenkov M, Lindau R, Baumgärtner S, Jäntsch U, Franke P, Möslang A. Assessment of industrial nitriding processes for fusion steel applications. NUCLEAR MATERIALS AND ENERGY 2017. [DOI: 10.1016/j.nme.2017.05.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Schauer F, Hoffmann J, Fischer J, Has C. Oral manifestations as the main feature of late-onset recessive dystrophic epidermolysis bullosa. J Eur Acad Dermatol Venereol 2017; 32:e161-e163. [PMID: 29080321 DOI: 10.1111/jdv.14663] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Voss S, Wiedenroth C, Essmann L, Troidl C, Nef H, Doerr O, Lipps C, Hoffmann J, Aleshcheva G, Mayer E, Hamm C, Liebetrau C. P4006Characterization of leucocyte subpopulations in circulating blood of patients with chronic thromboembolic pulmonary hypertension (CTEPH). Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p4006] [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: 11/14/2022] Open
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Lapert F, Schramm K, Hoffmann J, Eismann S, Rippinger N, Maatouk I, Rom J, Stepan H, Sohn C, Schott S. Notdienstkonsultationen in der Geburtsmedizin – Zeit für Telemedizin? Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1606166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Bukowska A, Spiller L, Wolke C, Lendeckel U, Weinert S, Hoffmann J, Bornfleth P, Kutschka I, Gardemann A, Isermann B, Goette A. Protective regulation of the ACE2/ACE gene expression by estrogen in human atrial tissue from elderly men. Exp Biol Med (Maywood) 2017; 242:1412-1423. [PMID: 28661206 DOI: 10.1177/1535370217718808] [Citation(s) in RCA: 136] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Data from animal experiments and clinical investigations suggest that components of the renin-angiotensin system are markedly affected by sex hormones. However, whether estrogen affects human atrial myocardium has not been investigated yet. In this study, we determined the effects of estrogen on key components of atrial renin-angiotensin system: angiotensin-converting enzyme, responsible for generation of angiotensin II and angiotensin-converting enzyme 2, counteracting majority of AngII effects, and different renin-angiotensin system receptors, AT1R, AT2R, and MAS. First, the expression levels of estrogen receptors mRNA were determined in right atrial appendages obtained from patients undergoing heart surgery. The amounts of estrogen receptor α and estrogen receptor β mRNA were similar between women ( n = 14) and men ( n = 10). Atrial tissue slices (350 µm) were prepared from male donors which were exposed to estrogen (1-100 nM; n = 21) or stimulated at 4 Hz for 24 h in the presence or absence of 100 nM estrogen ( n = 16), respectively. The administration of estrogen did not change mRNA levels of estrogen receptors, but activated MAP kinases, Erk1/2. Furthermore, estrogen increased the amounts of angiotensin-converting enzyme 2-mRNA (1.89 ± 0.23; P < 0.05) but reduced that of angiotensin-converting enzyme-mRNA (0.78 ± 0.07, P < 0.05). In addition, the transcript levels of AT2R and MAS were upregulated by estrogen. Pacing of tissue slices significantly increased the angiotensin-converting enzyme/angiotensin-converting enzyme 2 ratio at both the mRNA and protein level. During pacing, administration of estrogen substantially lowered the angiotensin-converting enzyme/angiotensin-converting enzyme 2 ratio at the transcript (0.92 ± 0.21 vs. 2.12 ± 0.27 at 4 Hz) and protein level (0.94 ± 0.20 vs. 2.14 ± 0.3 at 4 Hz). Moreover, estrogen elicited anti-inflammatory and anti-oxidative effects on renin-angiotensin system-associated downstream effectors such as pro-oxidative LOX-1 and pro-inflammatory ICAM-1. An antagonist of estrogen receptor α reversed these anti-inflammatory and anti-oxidative effects of estrogen significantly. Overall, our results demonstrated that estrogen modifies the local renin-angiotensin system homeostasis and achieves protective effects in atrial myocardium from elderly men. Impact statement The present study demonstrates that estrogen affects the human atrial myocardium and mediates protective actions through estrogen receptors-(ER) dependent signaling. Estrogen substantially modulates the local RAS via downregulation of ACE and simultaneous upregulation of ACE2, AT2R and MAS expression levels. This is indicative of a shift of the classical RAS/ACE axis to the alternative, protective RAS/ACE2 axis. In support of this view, estrogen attenuated the expression of RAS-associated downstream effectors, LOX-1, and ICAM-1. A specific antagonist of ERα reversed the anti-inflammatory and anti-oxidative effects of estrogen in paced and non-paced atrial tissue slices. In summary, our data demonstrate the existence of protective effects of estrogen in atrial tissue from elderly men which are at least in part, mediated by the regulation of local RAS homeostasis.
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Scheuermann-Poley C, Wagner C, Hoffmann J, Moter A, Willy C. Bedeutung des Biofilms für die Infektbehandlung in der Unfallchirurgie. Unfallchirurg 2017; 120:461-471. [DOI: 10.1007/s00113-017-0361-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Hoffmann J, Ossada V, Stepan H. Ein sFlt-1/PlGF-Quotient im Intermediärbereich ist mit einem erhöhten Risiko für eine Frühgeburt und Präeklampsie assoziiert. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1601538] [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] Open
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67
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Schramm K, Hoffmann J, Eismann S, Rippinger N, Stepan H, Sohn C, Schott S. Notdienstkonsultationen in der Geburtsmedizin – gibt es entscheidende oder beeinflussbare Faktoren? Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1601519] [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] Open
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Feldmann C, Deniz E, Schmidt T, Hoffmann J, Hanke J, Rojas S, Dogan G, Berliner D, Bara C, Bara C, Warnecke G, Haverich A, Schmitto J, Reiss N. Telemonitoring in LVAD-Patients: Acceptance and Need. J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.698] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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69
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Farhat R, French T, Bechhofer D, Kranz A, Hoffmann J. Quantifying the degree of abnormality on GI Bleeding Scans: results of a novel technique and implications for interventional radiology. J Vasc Interv Radiol 2017. [DOI: 10.1016/j.jvir.2016.12.1079] [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] Open
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Ahmed O, Baadh A, Liu L, Patel M, Tasse J, Hoffmann J, Arslan B. The changing face of HCC: forecasting future prevalence of NASH- and HCV-induced cirrhosis. J Vasc Interv Radiol 2017. [DOI: 10.1016/j.jvir.2016.12.1118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Avdievich NI, Hoffmann J, Shajan G, Pfrommer A, Giapitzakis IA, Scheffler K, Henning A. Evaluation of transmit efficiency and SAR for a tight fit transceiver human head phased array at 9.4 T. NMR IN BIOMEDICINE 2017; 30:e3680. [PMID: 28028862 DOI: 10.1002/nbm.3680] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 10/18/2016] [Accepted: 11/07/2016] [Indexed: 06/06/2023]
Abstract
Ultra-high field (UHF, ≥7 T) tight fit transceiver phased arrays improve transmit (Tx) efficiency (B1+ /√P) in comparison with Tx-only arrays, which are usually larger to fit receive (Rx)-only arrays inside. One of the major problems limiting applications of tight fit arrays at UHFs is the anticipated increase of local tissue heating, which is commonly evaluated by the local specific absorption rate (SAR). To investigate the tradeoff between Tx efficiency and SAR when a tight fit UHF human head transceiver phased array is used instead of a Tx-only/Rx-only RF system, a single-row eight-element prototype of a 400 MHz transceiver head phased array was constructed. The Tx efficiency and SAR of the array were evaluated and compared with that of a larger Tx-only array, which could also be used in combination with an 18-channel Rx-only array. Data were acquired on the Siemens Magnetom whole body 9.4 T human MRI system. Depending on the head size, positioning and the RF shim strategy, the smaller array provides from 11 to 23% higher Tx efficiency. In general, the Tx performance, evaluated as B1+ /√SAR, i.e. the safety excitation efficiency (SEE), is also not compromised. The two arrays provide very similar SEEs evaluated over 1000 random RF shim sets. We demonstrated that, in general, the tight fit transceiver array improves Tx performance without compromising SEE. However, in specific cases, the SEE value may vary, favoring one of the arrays, and therefore must be carefully evaluated.
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Barth A, Geiseler G, Hoffmann J, Scherzer K. Zum Mechanismus der Butemsomerisierung an Al2O3 - Cr2O3 - K2O - Katalysatoren. Z PHYS CHEM 2017. [DOI: 10.1515/zpch-1979-26072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Geiseler G, Quitzsch K, Hoffmann J, Möschler W. Physikalische Eigenschaften der stellungsisomeren n-Dodecylchloride. ACTA ACUST UNITED AC 2017. [DOI: 10.1515/zpch-1962-22031] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Stecklum M, Wulf-Goldenberg A, Brzezicha B, Fichtner I, Hoffmann J. Preclinical models of patient derived xenografts (PDX) for immuno-oncology research. Eur J Cancer 2016. [DOI: 10.1016/s0959-8049(16)32765-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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