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Roth Z'graggen B, Urner M, Beck-Schimmer B, Schläpfer M. Effects of sevoflurane and its metabolite hexafluoroisopropanol on hypoxia/reoxygenation-induced injury and mitochondrial bioenergetics in murine cardiomyocytes. BJA OPEN 2023; 5:100116. [PMID: 37587996 PMCID: PMC10430838 DOI: 10.1016/j.bjao.2022.100116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 11/22/2022] [Indexed: 08/18/2023]
Abstract
Background The volatile anaesthetic sevoflurane protects cardiac tissue from reoxygenation/reperfusion. Mitochondria play an essential role in conditioning. We aimed to investigate how sevoflurane and its primary metabolite hexafluoroisopropanol (HFIP) affect necrosis, apoptosis, and reactive oxygen species formation in cardiomyocytes upon hypoxia/reoxygenation injury. Moreover, we aimed to describe the similarities in the mode of action in a mitochondrial bioenergetics analysis. Methods Murine cardiomyocytes were exposed to hypoxia (0.2% O2 for 6 h), followed by reoxygenation (air with 5% CO2 for 2 h) in the presence or absence sevoflurane 2.2% or HFIP 4 mM. Lactate dehydrogenase (LDH) release (necrosis), caspase activation (apoptosis), reactive oxygen species, mitochondrial membrane potential, and mitochondrial function (Seahorse XF analyser) were measured. Results Hypoxia/reoxygenation increased cell death by 44% (+31 to +55%, P<0.001). Reoxygenation in the presence of sevoflurane 2.2% or HFIP 4 mM increased LDH release only by +18% (+6 to +30%) and 20% (+7 to +32%), respectively. Apoptosis and reactive oxygen species formation were attenuated by sevoflurane and HFIP. Mitochondrial bioenergetics analysis of the two substances was profoundly different. Sevoflurane did not influence oxygen consumption rate (OCR) or extracellular acidification rate (ECAR), whereas HFIP reduced OCR and increased ECAR, an effect similar to oligomycin, an adenosine triphosphate (ATP) synthase inhibitor. When blocking the metabolism of sevoflurane into HFIP, protective effects of sevoflurane - but not of HFIP - on LDH release and caspase were mitigated. Conclusion Together, our data suggest that sevoflurane metabolism into HFIP plays an essential role in cardiomyocyte postconditioning after hypoxia/reoxygenation injury.
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Affiliation(s)
| | - Martin Urner
- Institute of Physiology, University of Zurich, Zurich, Switzerland
- Interdepartmental Division of Critical Care Medicine and University of Toronto, Toronto, Canada
- Institute of Health Policy, Management, and Evaluation, University of Toronto, Toronto, Canada
| | - Beatrice Beck-Schimmer
- Institute of Physiology, University of Zurich, Zurich, Switzerland
- Institute of Anaesthesiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Martin Schläpfer
- Institute of Physiology, University of Zurich, Zurich, Switzerland
- Institute of Anaesthesiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
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Vintimilla Moscoso A, Figueira ERR, Rocha‐Filho JA, Urner M, Lanchotte C, Jukemura J, Ximenes JLS, Nahas SC, D'Albuquerque LAC, Galvao FHF. Hexafluoroisopropanol decreases liver ischemia-reperfusion injury by downregulation of high mobility group box-1 protein. Pharmacol Res Perspect 2022; 10:e01027. [PMID: 36404629 PMCID: PMC9676687 DOI: 10.1002/prp2.1027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 09/22/2022] [Accepted: 10/13/2022] [Indexed: 11/22/2022] Open
Abstract
Liver ischemia-reperfusion (IR) injury is associated with poor outcome after liver transplantation and liver resections. Hexafluoroisopropanol (HFIP) is a tri-fluorinated metabolites of volatile anesthetics and has modulatory effects on inflammation that have been observed mainly in cell culture experiments. In this survey, we investigated the effects of HFIP in a rat model of normothermic hepatic ischemia-reperfusion injury. Twenty-four male Wistar rats were randomized into three groups: (1) control in which animals were submitted to 30 min of partial liver ischemia with resection of non-ischemic liver lobes immediate after reperfusion, (2) pre-ischemia (PI) group in which animals received intravenous HFIP (67 mg/kg) 5 min before liver ischemia, and (3) pre-reperfusion (PR) group in which animals received intravenous HFIP (67 mg/kg) 5 min before reperfusion. Four hours after reperfusion, all animals were euthanized for sample collection. Aspartate and alanine transaminases, glucose, and high mobility group box-1 (HMGB-1) protein concentrations showed a significant decreased, and malondialdehyde was increased in the PR group compared with control and PI groups. Interleukin 6 (IL-6) was increased in the PI group compared with control and PR groups. IL-10 and -12 were increased in the PR and PI groups, respectively, when compared with the control group. Glucose decreased in the PR when compared with the control group. Post-conditioning with HFIP led to a decrease in hepatocellular injury and was associated with a downregulation of HMGB-1. The HFIP resulted in a better control of inflammatory response to ischemia-reperfusion even without causing a reduction in oxidative stress.
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Affiliation(s)
- Agustin Vintimilla Moscoso
- Laboratorio de Investigaçao Medica 37, Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
| | - Estela Regina Ramos Figueira
- Laboratorio de Investigaçao Medica 37, Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
- Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
| | - Joel Avancini Rocha‐Filho
- Laboratorio de Investigaçao Medica 37, Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
- Disciplina de Anestesiologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
| | - Martin Urner
- Divisao Interdepartamental de Medicina IntensivaUniversidade de TorontoTorontoOntarioCanada
- Instituto de Politicas, Gestao e Avaliaçao de SaudeUniversidade de TorontoTorontoOntarioCanada
| | - Cinthia Lanchotte
- Laboratorio de Investigaçao Medica 37, Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
| | - Jose Jukemura
- Laboratorio de Investigaçao Medica 37, Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
- Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
| | - Jorge Luiz Saraiva Ximenes
- Laboratorio de Investigaçao Medica 37, Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
| | - Sergio Carlos Nahas
- Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
| | - Luiz Augusto Carneiro D'Albuquerque
- Laboratorio de Investigaçao Medica 37, Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
- Serviço de Transplante de Figado e Orgaos do Aparelho Digestivo, Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
| | - Flavio Henrique Ferreira Galvao
- Laboratorio de Investigaçao Medica 37, Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
- Serviço de Transplante de Figado e Orgaos do Aparelho Digestivo, Departamento de Gastroenterologia, Hospital das Clinicas HCFMUSP, Faculdade de MedicinaUniversidade de Sao PauloSao PauloBrazil
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Sevoflurane Dampens Acute Pulmonary Inflammation via the Adenosine Receptor A2B and Heme Oxygenase-1. Cells 2022; 11:cells11071094. [PMID: 35406657 PMCID: PMC8997763 DOI: 10.3390/cells11071094] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 03/20/2022] [Accepted: 03/22/2022] [Indexed: 11/17/2022] Open
Abstract
Acute respiratory distress syndrome is a life-threatening disease associated with high mortality. The adenosine receptor A2B (Adora2b) provides anti-inflammatory effects, which are also associated with the intracellular enzyme heme oxygenase-1 (HO-1). Our study determined the mechanism of sevoflurane’s protective properties and investigated the link between sevoflurane and the impact of a functional Adora2b via HO-1 modulation during lipopolysaccharide (LPS)-induced lung injury. We examined the LPS-induced infiltration of polymorphonuclear neutrophils (PMNs) into the lung tissue and protein extravasation in wild-type and Adora2b−/− animals. We generated chimeric animals, to identify the impact of sevoflurane on Adora2b of hematopoietic and non-hematopoietic cells. Sevoflurane decreased the LPS-induced PMN-infiltration and diminished the edema formation in wild-type mice. Reduced PMN counts after sevoflurane treatment were detected only in chimeric mice, which expressed Adora2b exclusively on leukocytes. The Adora2b on hematopoietic and non-hematopoietic cells was required to improve the permeability after sevoflurane inhalation. Further, sevoflurane increased the protective effects of HO-1 modulation on PMN migration and microvascular permeability. These protective effects were abrogated by specific HO-1 inhibition. In conclusion, our data revealed new insights into the protective mechanisms of sevoflurane application during acute pulmonary inflammation and the link between sevoflurane and Adora2b, and HO-1 signaling, respectively.
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Fluorine induced conformational switching and modulation in photophysical properties of 7-fluorotryptophan: Spectroscopic, quantum chemical calculation and molecular dynamics simulation studies. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY 2020. [DOI: 10.1016/j.jpap.2020.100011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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Wang L, Yuan Q, Cao W, Han J, Zhou X, Liu S, Wang XB. Probing Orientation-Specific Charge-Dipole Interactions between Hexafluoroisopropanol and Halides: A Joint Photoelectron Spectroscopy and Theoretical Study. J Phys Chem A 2020; 124:2036-2045. [PMID: 32077296 DOI: 10.1021/acs.jpca.0c00024] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The interactions between hexafluoroisopropanol (HFIP) and halogen anions X- (F-, Cl-, Br-, and I-) have been investigated using negative ion photoelectron (NIPE) spectroscopy and ab initio calculations. The measured NIPE spectrum of each [HFIP·X]- (X = Cl, Br, and I) complex shows a pattern identical to the corresponding X- by shifting to the high electron binding energy side, indicative of the formation of the [HFIP···X-] structure in which X- interacts with HFIP via charge-dipole interactions. However, the spectrum of [HFIP·F]- appears completely different from that of F- and is more similar to the spectrum of the deprotonated HFIP anion (HFIP-H-). The geometry and electron density calculations indicate that a neutral HF molecule is formed upon HFIP interacting with F- via proton transfer, rendering a stable structure of [HFIP-H···HF]-. Two conformers of [HFIP-H·HF]- with HFIP being in synperiplanar and antiperiplanar configurations, respectively, are observed, providing direct experimental evidences to show the distinctly different and orientation-specific interactions between HFIP and halide anions.
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Affiliation(s)
- Lei Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Qinqin Yuan
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Wenjin Cao
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Jia Han
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Xiaoguo Zhou
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Shilin Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Xue-Bin Wang
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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Pena-Francesch A, Giltinan J, Sitti M. Multifunctional and biodegradable self-propelled protein motors. Nat Commun 2019; 10:3188. [PMID: 31320630 PMCID: PMC6639312 DOI: 10.1038/s41467-019-11141-9] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 06/26/2019] [Indexed: 12/18/2022] Open
Abstract
A diversity of self-propelled chemical motors, based on Marangoni propulsive forces, has been developed in recent years. However, most motors are non-functional due to poor performance, a lack of control, and the use of toxic materials. To overcome these limitations, we have developed multifunctional and biodegradable self-propelled motors from squid-derived proteins and an anesthetic metabolite. The protein motors surpass previous reports in performance output and efficiency by several orders of magnitude, and they offer control of their propulsion modes, speed, mobility lifetime, and directionality by regulating the protein nanostructure via local and external stimuli, resulting in programmable and complex locomotion. We demonstrate diverse functionalities of these motors in environmental remediation, microrobot powering, and cargo delivery applications. These versatile and degradable protein motors enable design, control, and actuation strategies in microrobotics as modular propulsion sources for autonomous minimally invasive medical operations in biological environments with air-liquid interfaces.
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Affiliation(s)
- Abdon Pena-Francesch
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
| | - Joshua Giltinan
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
| | - Metin Sitti
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany.
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Tung A, Pittet JF. Maybe the Wand Does Matter? Anesth Analg 2018; 124:7-8. [PMID: 27984307 DOI: 10.1213/ane.0000000000001701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Avery Tung
- *Department of Anesthesia and Critical Care, University of Chicago, Illinois; and †Department of Anesthesiology, University of Alabama, Birmingham, Alabama
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Zhang EF, Hou ZX, Shao T, Yang WW, Hu B, Wang XX, Zhang ZX, Huang Y, Xiong LZ, Hou LC. Combined administration of a sedative dose sevoflurane and 60% oxygen reduces inflammatory responses to sepsis in animals and in human PMBCs. Am J Transl Res 2017; 9:3105-3119. [PMID: 28670397 PMCID: PMC5489909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 04/23/2017] [Indexed: 06/07/2023]
Abstract
Our study aims to investigate the effects of the inhalation of subanesthestic doses of sevoflurane combined with oxygen on sepsis. Male Sprague-Dawley rats or Male ICR/Km mice underwent caecal ligation and puncture (CLP) or intraperitoneal injection of lipopolysccharide (LPS) to induce sepsis, while sham rats were used as control. Then, rats were treated with the inhalation of sevoflurane in oxygen; and air or 100% oxygen was used as control. Seven-day survival, lung injury and inflammatory factors were assessed. In this in vitro experiment, we obtained RAW264.7 macrophages and human peripheral blood mononuclear cells (PBMCs) incubated by LPS or plasma from septic patients to explore the NF-κB pathway in the effect of the inhalation of sevoflurane combined with oxygen in sepsis. In this study, we found that the inhalation of 0.5 MAC of sevoflurane in 60% oxygen was the best protocol for protecting against lethality resulting from sepsis and ALI, and there was a time window for these protective effects. We also founded that 0.5 MAC of sevoflurane in 60% oxygen inhibited the nuclear translocation of NF-κB in human PBMCs induced by LPS or plasma from septic patients. The subanesthesia dose sevoflurane in 60% oxygen may reduce sepsis-induced inflammatory responses in animals and in PBMCs, and the inhibition to the activation of the NF-κB pathway may contribute to this protection.
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Affiliation(s)
- Er-Fei Zhang
- Department of Anesthesiology and Critical Care Medicine, Xijing Hospital, The Fourth Military Medical UniversityXi’an 710032, Shaanxi Province, P. R. China
- Department of Anesthesiology, The Affiliated Hospital of Yan’an UniversityYan’an 716000, Shaanxi Province, P. R. China
| | - Zuo-Xu Hou
- Department of Aerospace Medicine, The Fourth Military Medical UniversityXi’an 710032, Shaanxi, P. R. China
| | - Tian Shao
- Department of Anesthesiology and Critical Care Medicine, Xijing Hospital, The Fourth Military Medical UniversityXi’an 710032, Shaanxi Province, P. R. China
| | - Wan-Wan Yang
- Department of Anesthesiology and Critical Care Medicine, Xijing Hospital, The Fourth Military Medical UniversityXi’an 710032, Shaanxi Province, P. R. China
| | - Bin Hu
- Department of Anesthesiology, The Affiliated Hospital of Yan’an UniversityYan’an 716000, Shaanxi Province, P. R. China
| | - Xiao-Xia Wang
- Department of Anesthesiology and Critical Care Medicine, Xijing Hospital, The Fourth Military Medical UniversityXi’an 710032, Shaanxi Province, P. R. China
| | - Ze-Xin Zhang
- Department of Anesthesiology and Critical Care Medicine, Xijing Hospital, The Fourth Military Medical UniversityXi’an 710032, Shaanxi Province, P. R. China
| | - Yi Huang
- Department of Anesthesiology and Critical Care Medicine, Xijing Hospital, The Fourth Military Medical UniversityXi’an 710032, Shaanxi Province, P. R. China
| | - Li-Ze Xiong
- Department of Anesthesiology and Critical Care Medicine, Xijing Hospital, The Fourth Military Medical UniversityXi’an 710032, Shaanxi Province, P. R. China
| | - Li-Chao Hou
- Department of Anesthesiology and Critical Care Medicine, Xijing Hospital, The Fourth Military Medical UniversityXi’an 710032, Shaanxi Province, P. R. China
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Urner M, Schläpfer M, Herrmann IK, Hasler M, Schimmer RR, Booy C, Roth Z'graggen B, Rehrauer H, Aigner F, Minshall RD, Stark WJ, Beck-Schimmer B. Insight into the beneficial immunomodulatory mechanism of the sevoflurane metabolite hexafluoro-2-propanol in a rat model of endotoxaemia. Clin Exp Immunol 2015; 181:468-79. [PMID: 25925908 DOI: 10.1111/cei.12648] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/19/2015] [Indexed: 12/13/2022] Open
Abstract
Volatile anaesthetics such as sevoflurane attenuate inflammatory processes, thereby impacting patient outcome significantly. Their inhalative administration is, however, strictly limited to controlled environments such as operating theatres, and thus an intravenously injectable immunomodulatory drug would offer distinct advantages. As protective effects of volatile anaesthetics have been associated with the presence of trifluorinated carbon groups in their basic structure, in this study we investigated the water-soluble sevoflurane metabolite hexafluoro-2-propanol (HFIP) as a potential immunomodulatory drug in a rat model of endotoxic shock. Male Wistar rats were subjected to intravenous lipopolysaccharide (LPS) and thereafter were treated with HFIP. Plasma and tissue inflammatory mediators, neutrophil invasion, tissue damage and haemodynamic stability were the dedicated end-points. In an endotoxin-induced endothelial cell injury model, underlying mechanisms were elucidated using gene expression and gene reporter analyses. HFIP reduced the systemic inflammatory response significantly and decreased endotoxin-induced tissue damage. Additionally, the LPS-provoked drop in blood pressure of animals was resolved by HFIP treatment. Pathway analysis revealed that the observed attenuation of the inflammatory process was associated with reduced nuclear factor kappa B (NF-κΒ) activation and suppression of its dependent transcripts. Taken together, intravenous administration of HFIP exerts promising immunomodulatory effects in endotoxaemic rats. The possibility of intravenous administration would overcome limitations of volatile anaesthetics, and thus HFIP might therefore represent an interesting future drug candidate for states of severe inflammation.
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Affiliation(s)
- M Urner
- Institute of Anesthesiology, University Hospital Zurich, Zurich, Switzerland.,Institute of Physiology, Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - M Schläpfer
- Institute of Anesthesiology, University Hospital Zurich, Zurich, Switzerland.,Institute of Physiology, Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - I K Herrmann
- Institute of Anesthesiology, University Hospital Zurich, Zurich, Switzerland
| | - M Hasler
- Institute of Anesthesiology, University Hospital Zurich, Zurich, Switzerland
| | - R R Schimmer
- Institute of Physiology, Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - C Booy
- Institute of Anesthesiology, University Hospital Zurich, Zurich, Switzerland.,Institute of Physiology, Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - B Roth Z'graggen
- Institute of Physiology, Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland.,Functional Genomics Center Zurich, University of Zurich, Zurich, Switzerland
| | - H Rehrauer
- Functional Genomics Center Zurich, University of Zurich, Zurich, Switzerland
| | - F Aigner
- Institute of Physiology, Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - R D Minshall
- Department of Anesthesiology, University of Illinois Chicago, Chicago, IL, USA
| | - W J Stark
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, Zurich, Switzerland
| | - B Beck-Schimmer
- Institute of Anesthesiology, University Hospital Zurich, Zurich, Switzerland.,Institute of Physiology, Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland.,Department of Anesthesiology, University of Illinois Chicago, Chicago, IL, USA
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