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Weiermair T, Svehlikova E, Magnes C, Boulgaropoulos B, Altendorfer-Kroath T, Hummer J, Eberl A. Implementation and validation of a UHPLC-MS/MS method for quantification of the endocannabinoids AEA and 2-AG in cerebral interstitial fluid and plasma. J Pharm Biomed Anal 2024; 238:115844. [PMID: 37979522 DOI: 10.1016/j.jpba.2023.115844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 10/19/2023] [Accepted: 11/02/2023] [Indexed: 11/20/2023]
Abstract
Endogenous endocannabinoids such as N-arachidonoylethanolamine (AEA) and 2-arachidonoylglycerol (2-AG) are involved in the patho-biochemistry of several neurological diseases and have been associated with mood-enhancing phenomena. Although they have been intensively studied in recent years, accurate and reliable quantification of these analytes in cerebral interstitial fluid (cISF) to elucidate their neuro-modulatory role is still challenging. Moreover, there is a need for an analytical method that can analyze plasma in addition to cISF and is thus able to address research questions in both preclinical and clinical studies. Aim was to implement a method for simultaneous quantification of AEA and 2-AG in cISF and plasma, to validate it by taking the requirements of the U.S. Food and Drug Administration into account, and to test its usability in three different case studies. A UHPLC-MS/MS method with preceding liquid-liquid extraction to determine AEA and 2-AG in cISF and plasma was successfully implemented, and the parameters selectivity, specificity, linearity, accuracy, precision, sensitivity, carry-over and stability met the validation criteria. The usability of the analytical method was demonstrated in an in vitro study with cerebral open flow microperfusion (cOFM), an in vivo cOFM study in rats, and a clinical study in human plasma. The developed method allowed quantification of AEA and 2-AG in the biologically relevant concentration ranges in cISF and plasma. The availability of a reliable, complementary, time-resolved dataset of endocannabinoid concentrations in both matrices can be of considerable future importance for the evaluation of drug efficacy.
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Affiliation(s)
- Theresia Weiermair
- HEALTH - Institute for Biomedical Research and Technologies, Joanneum Research Forschungsgesellschaft m.b.H, Neue Stiftingtalstrasse 2, Graz 8010, Austria
| | - Eva Svehlikova
- Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Christoph Magnes
- HEALTH - Institute for Biomedical Research and Technologies, Joanneum Research Forschungsgesellschaft m.b.H, Neue Stiftingtalstrasse 2, Graz 8010, Austria
| | - Beate Boulgaropoulos
- HEALTH - Institute for Biomedical Research and Technologies, Joanneum Research Forschungsgesellschaft m.b.H, Neue Stiftingtalstrasse 2, Graz 8010, Austria; Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Thomas Altendorfer-Kroath
- HEALTH - Institute for Biomedical Research and Technologies, Joanneum Research Forschungsgesellschaft m.b.H, Neue Stiftingtalstrasse 2, Graz 8010, Austria
| | - Joanna Hummer
- HEALTH - Institute for Biomedical Research and Technologies, Joanneum Research Forschungsgesellschaft m.b.H, Neue Stiftingtalstrasse 2, Graz 8010, Austria
| | - Anita Eberl
- HEALTH - Institute for Biomedical Research and Technologies, Joanneum Research Forschungsgesellschaft m.b.H, Neue Stiftingtalstrasse 2, Graz 8010, Austria.
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Rohrer U, Prenner G, Sereinigg M, Manninger M, Geczy T, Bisping E, Eberl A, Lercher P, Zirlik A, Scherr D. Electroanatomic mapping system guided his bundle pacemaker implantation: experience of the his bundle registry graz. Europace 2022. [DOI: 10.1093/europace/euac053.432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
Patients with bradyarrhythmia in need for ventricular pacing may suffer from pacing-induced heart failure due to unphysiological right ventricular pacing. His bundle pacing (HBP) allows to overcome this common issue with a more physiologic approach but real-life procedural data using this technology is scarce.
Methods
We report a single centre experience of the first 44 consecutive patients being implanted with a His-bundle-based pacemaker 09/2020-11/2021 per 3D-mapping guided implantation due to different types of bradyarrhythmia, or for cardiac resynchronisation therapy in heart failure combined with a left-ventricular lead (HOT-CRT) ± a right ventricular defibrillator lead. The positioning of the His-bundle-lead was done by identifying the His-bundle-location with a 3D electroanatomic mapping system via an introducing sheath that is provided with electrodes at its tip.
Results
Mean age was 70 [16;86] years, 12/44 (27%) patients were female, mean baseline LVEF was 44±18%. Baseline ECG was captured: QRS width was 123±33ms, with typical LBBB in 14/44 (32%), typical RBBB in 4/44 (9%), alternating BBB in one patient (2%) and either no BBB or ventricular escape rhythm in 25/44 (57%). Indications for implantation were AV-block grade II-III in 19/44 (43%), primary prophylactic ICD indication in HFrEF in 13/44 (30%), atrial fibrillation with bradycardic conduction in 7/44 patients (16%), sick-sinus-syndrome in 4/44 (9%) and secondary prophylactic ICD indication in one patient (2%). In 41/44 (93%) a primary device was implanted, in 3/44 (7%) a pre-existent device was upgraded with a HB lead.
Therefore, 14 dual-chamber-pacemaker, 5 single-chamber-pacemaker, 8 single-chamber CRT-P, 11 dual-chamber CRT-P, 4 single-chamber CRT-D, 2 dual-chamber CRT-D were implanted. In 50 patients HBP was attempted, while in 6/50 (12%) patients outside of this analysis the attempt was not successful, these patients were consecutively implanted with a non-HBP-device and therefor excluded from the further analysis.
In the 44 patients included in this analysis with primary successful HBP, 4/44 (9%) his-bundle-leads dislocated within the first 48 hours, leading to a secondary success rate of 91%. There were two post-procedural pneumothorax that needed drainage, no major procedure-related complications occurred. Median skin-to skin procedure time was 109±50 minutes. The paced QRS width at the post-implantation follow up was 115±32ms with a change in QRS width of -10ms (+72;-92ms). When excluding the secondary lead dislocations and including only the successful HB paced QRS complexes, the paced QRS width was 105±30ms and the change in QRS width was -12±42ms. The mean his-bundle threshold was 1,2±1V over 0,5ms (0,5;1,5ms). The proportion of ventricular pacing was 69±38%.
Conclusion
Electroanatomic-guided His bundle pacing is feasible, with high implantation success rate and electric impact, both regarding QRS width and pacing threshold.
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Affiliation(s)
- U Rohrer
- Medical University of Graz, Graz, Austria
| | - G Prenner
- Medical University of Graz, Graz, Austria
| | | | | | - T Geczy
- Medical University of Graz, Graz, Austria
| | - E Bisping
- Medical University of Graz, Graz, Austria
| | - A Eberl
- Medical University of Graz, Graz, Austria
| | - P Lercher
- Medical University of Graz, Graz, Austria
| | - A Zirlik
- Medical University of Graz, Graz, Austria
| | - D Scherr
- Medical University of Graz, Graz, Austria
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Prietl B, Odler B, Kirsch AH, Artinger K, Eigner M, Schmaldienst S, Pfeifer V, Stanzer S, Eberl A, Raml R, Rosenkranz A, Brodmann M, Eller P, Pieber T, Eller K. MO171: Chronic Inflammation Might Protect Haemodialysis Patients from Severe COVID-19. Nephrol Dial Transplant 2022. [PMCID: PMC9383969 DOI: 10.1093/ndt/gfac066.073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND AND AIMS Patients on haemodialysis (HD) are expected to have excess mortality in coronavirus disease 2019 (COVID-19). This was challenged by a recent study reporting HD patients to have comparable mortality and decreased ICU admissions when hospitalized with COVID-19. It was speculated that an altered immune system due to chronic inflammation might protect HD patients from severe COVID-19. Therefore, we designed a study to describe the peripheral blood immune phenotype in HD patients and respective controls with COVID-19. METHOD Sixty-four patients (31 HD, 33 non-HD) with PCR-confirmed severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and 16 control patients (10 HD, 6 non-HD) were prospectively included. According to symptoms, COVID-19 patients were categorized as asymptomatic/mild and moderate/severe COVID-19 phenotypes. Cytokine profiling and immune phenotyping were performed. RESULTS Th1 and Th17 plasma cytokine levels were highly increased in HD patients without SARS-CoV-2 infection and were not significantly regulated during COVID-19. In non-HD COVID-19 patients, these cytokines increased significantly with disease severity. While all patients with moderate/severe COVID-19 showed hallmarks of COVID-19 such as decreased CD3+ CD4+ and CD8+ and CD4+CD25hiFoxP3+ regulatory T cells, significantly increased CD38+CD8+ effector memory and CD38+CD8+ TEMRA T cells were detected in HD compared to non-HD patients with moderate/severe COVID-19. Furthermore, CD161+CD8+ T cells decreased significantly in non-HD COVID-19 patients dependent on disease severity, but not in HD patients. Dynamics of B cells and subtypes were comparable in HD and non-HD COVID-19 patients. Significantly fewer moderate/severe COVID-19 HD patients needed ICU treatment [1/13 (7.7%) HD, 12/24 (50%) non-HD], whereas no difference in mortality was observed [4/31 (12.9%) HD, 6/33 non-HD (18.2%)]. CONCLUSION HD patients might be protected from severe COVID-19 due to their chronic inflammatory state with increased CD38+CD8+ effector memory and TEMRA T cells as well as CD161+CD8+ T cells.
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Affiliation(s)
- Barbara Prietl
- Center for Biomarker Research in Medicine, Graz, Austria
| | - Balazs Odler
- Medical University of Graz, Clinical Division of Nephrology, Graz, Austria
| | - Alexander H Kirsch
- Medical University of Graz, Clinical Division of Nephrology, Graz, Austria
| | - Katharina Artinger
- Medical University of Graz, Clinical Division of Nephrology, Graz, Austria
| | | | | | - Verena Pfeifer
- Center for Biomarker Research in Medicine, Graz, Austria
| | | | - Anita Eberl
- Joanneum Research Forschungsgesellschaft mbH, Graz, Austria
| | - Reingard Raml
- Joanneum Research Forschungsgesellschaft mbH, Graz, Austria
| | | | - Marianne Brodmann
- Medical University of Graz, Clinical Division of Angiology, Graz, Austria
| | - Philipp Eller
- Medical University of Graz, Intensive Care Unit, Department of Internal Medicine, Graz, Austria
| | - Thomas Pieber
- Center for Biomarker Research in Medicine, Graz, Austria
| | - Kathrin Eller
- Medical University of Graz, Clinical Division of Nephrology, Graz, Austria
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Prietl B, Odler B, Kirsch AH, Artinger K, Eigner M, Schmaldienst S, Pfeifer V, Stanzer S, Eberl A, Raml R, Pieber T, Rosenkranz AR, Brodmann M, Eller P, Eller K. Chronic Inflammation Might Protect Hemodialysis Patients From Severe COVID-19. Front Immunol 2022; 13:821818. [PMID: 35265078 PMCID: PMC8901184 DOI: 10.3389/fimmu.2022.821818] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 01/24/2022] [Indexed: 12/11/2022] Open
Abstract
Hemodialysis patients (HD) are expected to have excess mortality in coronavirus disease 2019 (COVID-19). This was challenged by a recent study reporting HD patients to have comparable mortality and less ICU admissions when hospitalized with COVID-19. An altered immune system due to chronic inflammation might protect HD-patients from severe COVID-19. Therefore, we aimed to describe the peripheral blood immune phenotype in HD-patients and respective controls with COVID-19.
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Affiliation(s)
- Barbara Prietl
- Center for Biomarker Research in Medicine, Graz, Austria.,Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Balazs Odler
- Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Alexander H Kirsch
- Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Katharina Artinger
- Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Manfred Eigner
- Klinikum Favoriten, Wiener Krankenanstaltenverbund, Vienna, Austria
| | | | - Verena Pfeifer
- Center for Biomarker Research in Medicine, Graz, Austria.,Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | | | - Anita Eberl
- Institute for Biomedicine and Health Sciences, Joanneum Research Forschungsgesellschaft mbH, Graz, Austria
| | - Reingard Raml
- Institute for Biomedicine and Health Sciences, Joanneum Research Forschungsgesellschaft mbH, Graz, Austria
| | - Thomas Pieber
- Center for Biomarker Research in Medicine, Graz, Austria.,Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Alexander R Rosenkranz
- Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Marianne Brodmann
- Division of Angiology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Philipp Eller
- Intensive Care Unit, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Kathrin Eller
- Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
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5
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Geidl-Flueck B, Hochuli M, Németh Á, Eberl A, Derron N, Köfeler HC, Tappy L, Berneis K, Spinas GA, Gerber PA. Fructose- and sucrose- but not glucose-sweetened beverages promote hepatic de novo lipogenesis: A randomized controlled trial. J Hepatol 2021; 75:46-54. [PMID: 33684506 DOI: 10.1016/j.jhep.2021.02.027] [Citation(s) in RCA: 76] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 02/03/2021] [Accepted: 02/18/2021] [Indexed: 01/01/2023]
Abstract
BACKGROUND & AIMS Excessive fructose intake is associated with increased de novo lipogenesis, blood triglycerides, and hepatic insulin resistance. We aimed to determine whether fructose elicits specific effects on lipid metabolism independently of excessive caloric intake. METHODS A total of 94 healthy men were studied in this double-blind, randomized trial. They were assigned to daily consumption of sugar-sweetened beverages (SSBs) containing moderate amounts of fructose, sucrose (fructose-glucose disaccharide) or glucose (80 g/day) in addition to their usual diet or SSB abstinence (control group) for 7 weeks. De novo fatty acid (FA) and triglyceride synthesis, lipolysis and plasma free FA (FFA) oxidation were assessed by tracer methodology. RESULTS Daily intake of beverages sweetened with free fructose and fructose combined with glucose (sucrose) led to a 2-fold increase in basal hepatic fractional secretion rates (FSR) compared to control (median FSR %/day: sucrose 20.8 (p = 0.0015); fructose 19.7 (p = 0.013); control 9.1). Conversely, the same amounts of glucose did not change FSR (median of FSR %/day 11.0 (n.s.)). Fructose intake did not change basal secretion of newly synthesized VLDL-triglyceride, nor did it alter rates of peripheral lipolysis, nor total FA and plasma FFA oxidation. Total energy intake was similar across groups. CONCLUSIONS Regular consumption of both fructose- and sucrose-sweetened beverages in moderate doses - associated with stable caloric intake - increases hepatic FA synthesis even in a basal state; this effect is not observed after glucose consumption. These findings provide evidence of an adaptative response to regular fructose exposure in the liver. LAY SUMMARY This study investigated the metabolic effects of daily sugar-sweetened beverage consumption for several weeks in healthy lean men. It revealed that beverages sweetened with the sugars fructose and sucrose (glucose and fructose combined), but not glucose, increase the ability of the liver to produce lipids. This change may pave the way for further unfavorable effects on metabolic health. CLINICAL TRIAL REGISTRATION NUMBER NCT01733563.
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Affiliation(s)
- Bettina Geidl-Flueck
- Department of Endocrinology, Diabetology and Clinical Nutrition, University Hospital Zurich (USZ) and University of Zurich (UZH), Switzerland.
| | - Michel Hochuli
- Department of Endocrinology, Diabetology and Clinical Nutrition, University Hospital Zurich (USZ) and University of Zurich (UZH), Switzerland; Department of Diabetes, Endocrinology, Nutritional Medicine and Metabolism, Inselspital, Bern University Hospital and University of Bern, Switzerland
| | - Ágota Németh
- Department of Endocrinology, Diabetology and Clinical Nutrition, University Hospital Zurich (USZ) and University of Zurich (UZH), Switzerland
| | - Anita Eberl
- Institute for Biomedicine and Health Sciences, Joanneum Research, Graz, Austria
| | - Nina Derron
- Department of Endocrinology, Diabetology and Clinical Nutrition, University Hospital Zurich (USZ) and University of Zurich (UZH), Switzerland
| | - Harald C Köfeler
- Core Facility Mass Spectrometry, Medical University of Graz, Austria
| | - Luc Tappy
- Department of Physiology, University of Lausanne, Switzerland
| | - Kaspar Berneis
- Department of Endocrinology, Diabetology and Clinical Nutrition, University Hospital Zurich (USZ) and University of Zurich (UZH), Switzerland
| | - Giatgen A Spinas
- Department of Endocrinology, Diabetology and Clinical Nutrition, University Hospital Zurich (USZ) and University of Zurich (UZH), Switzerland
| | - Philipp A Gerber
- Department of Endocrinology, Diabetology and Clinical Nutrition, University Hospital Zurich (USZ) and University of Zurich (UZH), Switzerland
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Hofmann E, Fink J, Eberl A, Prugger EM, Kolb D, Luze H, Schwingenschuh S, Birngruber T, Magnes C, Mautner SI, Kamolz LP, Kotzbeck P. A novel human ex vivo skin model to study early local responses to burn injuries. Sci Rep 2021; 11:364. [PMID: 33432026 PMCID: PMC7801530 DOI: 10.1038/s41598-020-79683-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 11/23/2020] [Indexed: 01/29/2023] Open
Abstract
Burn injuries initiate numerous processes such as heat shock response, inflammation and tissue regeneration. Reliable burn models are needed to elucidate the exact sequence of local events to be able to better predict when local inflammation triggers systemic inflammatory processes. In contrast to other ex vivo skin culture approaches, we used fresh abdominal skin explants to introduce contact burn injuries. Histological and ultrastructural analyses confirmed a partial-thickness burn pathology. Gene expression patterns and cytokine production profiles of key mediators of the local inflammation, heat shock response, and tissue regeneration were analyzed for 24 h after burn injury. We found significantly increased expression of factors involved in tissue regeneration and inflammation soon after burn injury. To investigate purely inflammation-mediated reactions we injected lipopolysaccharide into the dermis. In comparison to burn injury, lipopolysaccharide injection initiated an inflammatory response while expression patterns of heat shock and tissue regeneration genes were unaffected for the duration of the experiment. This novel ex vivo human skin model is suitable to study the local, early responses to skin injuries such as burns while maintaining an intact overall tissue structure and it gives valuable insights into local mechanisms at the very beginning of the wound healing process after burn injuries.
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Affiliation(s)
- Elisabeth Hofmann
- grid.8684.20000 0004 0644 9589COREMED-Cooperative Centre for Regenerative Medicine, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Graz, Austria ,grid.11598.340000 0000 8988 2476Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, Graz, Austria
| | - Julia Fink
- grid.8684.20000 0004 0644 9589COREMED-Cooperative Centre for Regenerative Medicine, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Graz, Austria
| | - Anita Eberl
- grid.8684.20000 0004 0644 9589HEALTH-Institute for Biomedicine and Health Sciences, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Graz, Austria
| | - Eva-Maria Prugger
- grid.8684.20000 0004 0644 9589HEALTH-Institute for Biomedicine and Health Sciences, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Graz, Austria
| | - Dagmar Kolb
- grid.11598.340000 0000 8988 2476Core Facility Ultrastructure Analysis, Center for Medical Research, Medical University of Graz, Graz, Austria ,grid.11598.340000 0000 8988 2476Division of Cell Biology, Histology and Embryology, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Hanna Luze
- grid.8684.20000 0004 0644 9589COREMED-Cooperative Centre for Regenerative Medicine, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Graz, Austria ,grid.11598.340000 0000 8988 2476Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, Graz, Austria
| | - Simon Schwingenschuh
- grid.8684.20000 0004 0644 9589HEALTH-Institute for Biomedicine and Health Sciences, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Graz, Austria
| | - Thomas Birngruber
- grid.8684.20000 0004 0644 9589HEALTH-Institute for Biomedicine and Health Sciences, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Graz, Austria
| | - Christoph Magnes
- grid.8684.20000 0004 0644 9589HEALTH-Institute for Biomedicine and Health Sciences, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Graz, Austria
| | - Selma I. Mautner
- grid.11598.340000 0000 8988 2476Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, Graz, Austria ,grid.8684.20000 0004 0644 9589HEALTH-Institute for Biomedicine and Health Sciences, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Graz, Austria ,grid.11598.340000 0000 8988 2476Division of Endocrinology and Diabetology, Medical University of Graz, Graz, Austria
| | - Lars-Peter Kamolz
- grid.8684.20000 0004 0644 9589COREMED-Cooperative Centre for Regenerative Medicine, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Graz, Austria ,grid.11598.340000 0000 8988 2476Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, Graz, Austria
| | - Petra Kotzbeck
- grid.8684.20000 0004 0644 9589COREMED-Cooperative Centre for Regenerative Medicine, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Graz, Austria ,grid.11598.340000 0000 8988 2476Division of Plastic, Aesthetic and Reconstructive Surgery, Department of Surgery, Medical University of Graz, Graz, Austria ,grid.11598.340000 0000 8988 2476Division of Endocrinology and Diabetology, Medical University of Graz, Graz, Austria
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Pipper C, Bordag N, Reiter B, Economides K, Florian P, Birngruber T, Sinner F, Bodenlenz M, Eberl A. LC/MS/MS analyses of open-flow microperfusion samples quantify eicosanoids in a rat model of skin inflammation. J Lipid Res 2019; 60:758-766. [PMID: 30696699 PMCID: PMC6446707 DOI: 10.1194/jlr.m087221] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Revised: 01/25/2019] [Indexed: 12/13/2022] Open
Abstract
Eicosanoids are lipid-mediator molecules with key roles in inflammatory skin diseases, such as psoriasis. Eicosanoids are released close to the source of inflammation, where they elicit local pleiotropic effects and dysregulations. Monitoring inflammatory mediators directly in skin lesions could provide new insights and therapeutic possibilities. Here, we analyzed dermal interstitial fluid samples obtained by dermal open-flow microperfusion in a rat model of skin inflammation. We developed a solid-phase extraction ultra-HPLC/MS/MS method to reliably and precisely analyze small-volume samples and quantified 11 eicosanoids [thromboxane B2, prostaglandin (PG) E2, PGD2, PGF2α, leukotriene B4, 15-HETE, 12-HETE, 5-HETE, 12-hydroxyeicosapentaenoic acid, 13-HODE, and 17-hydroxydocosahexaenoic acid]. Our method achieved a median intraday precision of approximately 5% and interday precision of approximately 8%. All calibration curves showed excellent linearity between 0.01 and 50 ng/ml (R2 > 0.980). In the rat model, eicosanoids were significantly increased in imiquimod-treated inflamed skin sites compared with untreated control sites. Oral treatment with an anti-inflammatory glucocorticoid decreased eicosanoid concentrations. These results show that a combination of tissue-specific sampling with LC/MS analytics is well suited for analyzing small sample volumes from minimally invasive sampling methods such as open-flow microperfusion or microdialysis to study local inflammation and the effect of treatments in skin diseases.
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Affiliation(s)
- Cornelia Pipper
- Joanneum Research Forschungsgesellschaft mbH, Institute for Biomedicine and Health Sciences, Graz, Austria; Center for Biomarker Research in Medicine Graz, Austria
| | | | - Bernadette Reiter
- Joanneum Research Forschungsgesellschaft mbH, Institute for Biomedicine and Health Sciences, Graz, Austria
| | - Kyriakos Economides
- Type 2 Inflammation and Fibrosis Immunology and Inflammation Research TA, Sanofi, Framingham, MA
| | - Peter Florian
- Type 1/17 Immunology and Arthritis Cluster, Immunology and Inflammation Research TA, Sanofi, Frankfurt am Main, Germany
| | - Thomas Birngruber
- Joanneum Research Forschungsgesellschaft mbH, Institute for Biomedicine and Health Sciences, Graz, Austria
| | - Frank Sinner
- Joanneum Research Forschungsgesellschaft mbH, Institute for Biomedicine and Health Sciences, Graz, Austria
| | - Manfred Bodenlenz
- Joanneum Research Forschungsgesellschaft mbH, Institute for Biomedicine and Health Sciences, Graz, Austria
| | - Anita Eberl
- Joanneum Research Forschungsgesellschaft mbH, Institute for Biomedicine and Health Sciences, Graz, Austria.
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Altendorfer-Kroath T, Schimek D, Eberl A, Rauter G, Ratzer M, Raml R, Sinner F, Birngruber T. Comparison of cerebral Open Flow Microperfusion and Microdialysis when sampling small lipophilic and small hydrophilic substances. J Neurosci Methods 2018; 311:394-401. [PMID: 30266621 DOI: 10.1016/j.jneumeth.2018.09.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 03/13/2018] [Revised: 09/20/2018] [Accepted: 09/20/2018] [Indexed: 10/28/2022]
Abstract
BACKGROUND Assessment of drug concentration in the brain interstitial fluid (ISF) is crucial for development of brain active drugs, which are mainly small, lipophilic substances able to cross the blood-brain barrier (BBB). We aimed to compare the applicability of cerebral Open Flow Microperfusion (cOFM) and Microdialysis (MD) to sample the lipophilic substance amitriptyline (AMI), its metabolites Hydroxyamitriptyline (HYA), Nortriptyline (NOR), Amitriptyline-N-Oxide (ANO), deuterated water (D2O) and the hydrophilic substance sodium fluorescein (Naf) in brain ISF. NEW METHOD: cOFM has been refined to yield increased spatial resolution and performance. COMPARISON OF COFM AND MD AND RESULTS Performance of cOFM and MD was assessed by in vivo AUC ratios of probe samples (AUCCOFM/AUCMD) and the in vivo relative recovery of D2O (RRvv,D2O). Adsorption of AMI and Naf to MD and cOFM was assessed by the in vitro relative recovery (RRvt) prior to the in vivo experiments. The in vivo AUC ratio of AMI and RRvv,D2O was about two times higher for cOFM than for MD (AUCOFM/AUCMD = 2.0, RRvv,D2O(cOFM)/RRvv,D2O(MD) = 2.1). cOFM detected all investigated AMI metabolites except NOR. MD did not detect HYA, NOR, ANO and Naf. In vitro adsorption of AMI and Naf to the MD membrane was strong (RRvt,AMI = 4.4%, RRvt,Naf = 1.5%) but unspecific adsorption to cOFM was negligibly small (RRvt,AMI = 98% and RRvt,Naf = 98%). CONCLUSIONS cOFM showed better performance when sampling AMI and its metabolites, Naf and D2O, and had an about two times higher RRvv,D2O than MD. MD did not detect HYA, NOR, ANO and Naf, most likely due to membrane adsorption.
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Affiliation(s)
- Thomas Altendorfer-Kroath
- JOANNEUM RESEARCH Forschungsgesellschaft mbH, HEALTH - Institute for Biomedicine and Health Sciences, Neue Stiftingtalstraße 2, 8010 Graz, Austria
| | - Denise Schimek
- JOANNEUM RESEARCH Forschungsgesellschaft mbH, HEALTH - Institute for Biomedicine and Health Sciences, Neue Stiftingtalstraße 2, 8010 Graz, Austria
| | - Anita Eberl
- JOANNEUM RESEARCH Forschungsgesellschaft mbH, HEALTH - Institute for Biomedicine and Health Sciences, Neue Stiftingtalstraße 2, 8010 Graz, Austria
| | - Günther Rauter
- Medical University of Graz, Division of Biomedical Research, Roseggerweg 48, 8036 Graz, Austria
| | - Maria Ratzer
- JOANNEUM RESEARCH Forschungsgesellschaft mbH, HEALTH - Institute for Biomedicine and Health Sciences, Neue Stiftingtalstraße 2, 8010 Graz, Austria
| | - Reingard Raml
- JOANNEUM RESEARCH Forschungsgesellschaft mbH, HEALTH - Institute for Biomedicine and Health Sciences, Neue Stiftingtalstraße 2, 8010 Graz, Austria
| | - Frank Sinner
- JOANNEUM RESEARCH Forschungsgesellschaft mbH, HEALTH - Institute for Biomedicine and Health Sciences, Neue Stiftingtalstraße 2, 8010 Graz, Austria; Medical University of Graz, Division of Endocrinology and Diabetology, Auenbruggerplatz 15, 8036 Graz, Austria
| | - Thomas Birngruber
- JOANNEUM RESEARCH Forschungsgesellschaft mbH, HEALTH - Institute for Biomedicine and Health Sciences, Neue Stiftingtalstraße 2, 8010 Graz, Austria.
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Eberl A, Sonc M, Dartsch D, Saar M, Meier K, Virant I. Patient counselling at dispensing of oral anticancer drugs in Europe. Eur J Cancer 2017. [DOI: 10.1016/s0959-8049(17)30512-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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11
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Eberl A, Altendorfer-Kroath T, Kollmann D, Birngruber T, Sinner F, Raml R, Magnes C. Determination of 2H-enrichment of rat brain interstitial fluid and rat plasma by headspace-gas-chromatography – quadrupole-mass-spectrometry. Anal Biochem 2016; 509:130-134. [DOI: 10.1016/j.ab.2016.07.010] [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] [Received: 04/07/2016] [Revised: 07/06/2016] [Accepted: 07/07/2016] [Indexed: 11/17/2022]
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12
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Fortuna M, Kovačevič M, Eberl A, Sonc M, Tavčar P, Virant I, Rožman S. PS-005 Effectiveness and toxicity of hyperthermic isolated limb perfusion with antitumor drugs in treatment of in-transit metastases of melanoma and sarcoma. Eur J Hosp Pharm 2016. [DOI: 10.1136/ejhpharm-2016-000875.490] [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: 11/04/2022] Open
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13
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Fortuna M, Hazdovac T, Sonc M, Tavcar P, Virant I, Kovacevic M, Rozman S, Eberl A. PS-010 Screening of electronically prescribed cytostatic drug protocols for medication errors. Eur J Hosp Pharm 2015. [DOI: 10.1136/ejhpharm-2015-000639.337] [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: 11/03/2022] Open
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14
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Triebl A, Trötzmüller M, Eberl A, Hanel P, Hartler J, Köfeler HC. Quantitation of phosphatidic acid and lysophosphatidic acid molecular species using hydrophilic interaction liquid chromatography coupled to electrospray ionization high resolution mass spectrometry. J Chromatogr A 2014; 1347:104-10. [PMID: 24813932 DOI: 10.1016/j.chroma.2014.04.070] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [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: 01/27/2014] [Revised: 03/27/2014] [Accepted: 04/22/2014] [Indexed: 10/25/2022]
Abstract
A method for a highly selective and sensitive identification and quantitation of lysophosphatidic acid (LPA) and phosphatidic acid (PA) molecular species was developed using hydrophilic interaction liquid chromatography (HILIC) followed by negative-ion electrospray ionization high resolution mass spectrometry. Different extraction methods for the polar LPA and PA species were compared and a modified Bligh & Dyer extraction by addition of 0.1M hydrochloric acid resulted in a ≈1.2-fold increase of recovery for the 7 PA and a more than 15-fold increase for the 6 LPA molecular species of a commercially available natural mix compared to conventional Bligh & Dyer extraction. This modified Bligh & Dyer extraction did not show any artifacts resulting from hydrolysis of natural abundant phospholipids. The developed HILIC method is able to separate all PA and LPA species from major polar membrane lipid classes which might have suppressive effects on the minor abundant lipid classes of interest. The elemental compositions of intact lipid species are provided by the high mass resolution of 100,000 and high mass accuracy below 3ppm of the Orbitrap instrument. Additionally, tandem mass spectra were generated in a parallel data dependent acquisition mode in the linear ion trap to provide structural information at molecular level. Limits of quantitation were identified at 45fmol on column and the dynamic range reaches 20pmol on column, covering the range of natural abundance well. By applying the developed method to mouse brain it can be shown that phosphatidic acid contains less unsaturated fatty acids with PA 34:1 and PA 36:1 as the major species. In contrast, for LPA species a high content of polyunsaturated fatty acids (LPA 20:4 and LPA 22:6) was quantified.
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Affiliation(s)
- Alexander Triebl
- Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, Stiftingtalstrasse 24, 8010 Graz, Austria
| | - Martin Trötzmüller
- Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, Stiftingtalstrasse 24, 8010 Graz, Austria; Omics Center Graz, Stiftingtalstrasse 24, 8010 Graz, Austria.
| | - Anita Eberl
- HEALTH - Institute for Biomedicine and Health Sciences, Joanneum Research Forschungsgesellschaft m.b.H., Graz, Austria
| | - Pia Hanel
- Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, Stiftingtalstrasse 24, 8010 Graz, Austria
| | - Jürgen Hartler
- Institute for Genomics and Bioinformatics, Graz University of Technology, Graz, Austria; Omics Center Graz, Stiftingtalstrasse 24, 8010 Graz, Austria
| | - Harald C Köfeler
- Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, Stiftingtalstrasse 24, 8010 Graz, Austria; Omics Center Graz, Stiftingtalstrasse 24, 8010 Graz, Austria
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15
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Fortuna Luzar M, Sonc M, Borstnar S, Bernot M, Hotujec S, Tavcar P, Virant I, Eberl A, Kovacevic M, Rozman S. PS-022 Guidelines for treatment of anticancer drugs extravasation and statistically review of all documented cases of extravasation during the period 2010–2013. Eur J Hosp Pharm 2014. [DOI: 10.1136/ejhpharm-2013-000436.373] [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: 11/04/2022] Open
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16
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Tavcar P, Sonc M, Luzar MF, Eberl A, Virant I, Rozman S. CPC-085 Medicines and Their Costs in the Last Six Days of Life. Eur J Hosp Pharm 2013. [DOI: 10.1136/ejhpharm-2013-000276.542] [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: 11/03/2022] Open
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17
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Fauland A, Trötzmüller M, Eberl A, Afiuni-Zadeh S, Köfeler H, Guo X, Lankmayr E. An improved SPE method for fractionation and identification of phospholipids. J Sep Sci 2013; 36:744-51. [PMID: 23349108 DOI: 10.1002/jssc.201200708] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Revised: 09/14/2012] [Accepted: 10/25/2012] [Indexed: 11/09/2022]
Abstract
This work reports an efficient and universal SPE method developed for separation and identification of phospholipids derived from complex biological samples. For the separation step, sequential combination of silica gel-aminopropyl-silica gel SPE cartridges is applied. This setup enables separation of phosphatidylcholine, lysophosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, phosphatidic acid, phosphatidylinositol, phosphatidylserine, cardiolipin, and sphingomyelin into four fractions according to the polarity of their headgroups. Sample acquisition of the SPE fractions is performed by a high-resolution LC-MS system consisting of a hybrid linear IT Fourier transform ion cyclotron resonance mass spectrometer coupled to RP-HPLC. The unequivocal advantage of our SPE sample preparation setup is avoidance of analyte peak overlapping in the determination step done by RP-HPLC. Overlapping phospholipid signals would otherwise exert adverse ion suppression effects. An additional benefit of this method is the elimination of polar and nonpolar (e.g. neutral lipids) contaminants from the phospholipid fractions, which highly reduces contamination of the LC-MS system. The method was validated with fermentation samples of organic waste, where 78 distinct phospholipid and sphingomyelin species belonging to six lipid classes were successfully identified.
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Affiliation(s)
- Alexander Fauland
- Institute of Analytical Chemistry and Food Chemistry, Graz University of Technology, Graz, Austria
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18
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Schimrigk S, Adibi I, Eberl A, Selka I, Galle J, Schmidt S, Fritz H, Fassbender C, Klingel R, Füchtemann D, Hoffmann F. Immunadsorption zur Eskalation der Schubtherapie bei Multipler Sklerose. Akt Neurol 2012. [DOI: 10.1055/s-0032-1305029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
| | - I. Adibi
- Klinik für Neurologie, Klinikum Lüdenscheid
| | - A. Eberl
- Klinik für Neurologie, Klinikum Lüdenscheid
| | - I. Selka
- Klinik für Neurologie, Klinikum Lüdenscheid
| | - J. Galle
- Klinik für Nephrologie und Dialyseverfahren, Klinikum Lüdenscheid
| | - S. Schmidt
- Klinik für Anästhesiologie, Intensivmedizin und Schmerztherapie, Krankenhaus Martha-Maria, Halle-Dölau
| | - H. Fritz
- Klinik für Anästhesiologie, Intensivmedizin und Schmerztherapie, Krankenhaus Martha-Maria, Halle-Dölau
| | | | | | | | - F. Hoffmann
- Klinik für Neurologie, Krankenhaus Martha-Maria, Halle-Dölau
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19
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Schimrigk S, Adibi I, Eberl A, Selka I, Galle J, Schmidt S, Fritz H, Fassbender C, Klingel R, Füchtemann D, Hoffmann F. Immunadsorption zur Eskalation der Schubtherapie bei Multipler Sklerose. Akt Neurol 2012. [DOI: 10.1055/s-0032-1321387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
| | - I. Adibi
- Klinik für Neurologie, Klinikum Lüdenscheid
| | - A. Eberl
- Klinik für Neurologie, Klinikum Lüdenscheid
| | - I. Selka
- Klinik für Neurologie, Klinikum Lüdenscheid
| | - J. Galle
- Klinik für Nephrologie und Dialyseverfahren, Klinikum Lüdenscheid
| | - S. Schmidt
- Klinik für Anästhesiologie, Intensivmedizin und Schmerztherapie, Krankenhaus Martha-Maria, Halle-Dölau
| | - H. Fritz
- Klinik für Anästhesiologie, Intensivmedizin und Schmerztherapie, Krankenhaus Martha-Maria, Halle-Dölau
| | | | | | | | - F. Hoffmann
- Klinik für Neurologie, Krankenhaus Martha-Maria, Halle-Dölau
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20
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Hasmann A, Eberl A, Schneider K, Schoening KU, Kaufmann F, Glieder A, Kovač J, Cavaco-paulo A, Wehrschuetz-Sigl E, Guebitz GM. Hydroxylation of polypropylene using the monooxygenase mutant 139-3 fromBacillus megaterium BM3. BIOCATAL BIOTRANSFOR 2012. [DOI: 10.3109/10242422.2012.645367] [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: 11/13/2022]
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21
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Fauland A, Köfeler H, Trötzmüller M, Knopf A, Hartler J, Eberl A, Chitraju C, Lankmayr E, Spener F. A comprehensive method for lipid profiling by liquid chromatography-ion cyclotron resonance mass spectrometry. J Lipid Res 2011; 52:2314-2322. [PMID: 21960706 DOI: 10.1194/jlr.d016550] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
This work aims to combine chromatographic retention, high mass resolution and accuracy, MS/MS spectra, and a package for automated identification and quantitation of lipid species in one platform for lipidomic analysis. The instrumental setup elaborated comprises reversed-phase HPLC coupled to a Fourier transform ion cyclotron resonance mass spectrometer (LTQ-FT), and Lipid Data Analyzer (LDA) software. Data analysis for lipid species quantification in this platform is based on retention time, mass resolution of 200,000, and mass accuracy below 2 ppm. In addition, automatically generated MS/MS spectra provide structural information at molecular level. This LC/MS technology allows analyzing complex biological samples in a quantitative manner as shown here paradigmatically for murine lipid droplets having a huge surplus of triacylglycerol species. Chromatographic preseparation of the bulk lipid class alleviates the problem of ion suppression of lipid species from other classes. Extension of 1D to 2D chromatography is possible, yet time consuming. The platform affords unambiguous detection of lipid species as low as 0.1‰ within major lipid classes. Taken together, a novel lipidomic LC/MS platform based on chromatographic retention, high mass resolution and accuracy, MS/MS analysis, and quantitation software enables analysis of complex samples as demonstrated for lipid droplets.
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Affiliation(s)
- Alexander Fauland
- Institute of Analytical Chemistry and Food Chemistry Graz University of Technology, Graz, Austria
| | - Harald Köfeler
- Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, Graz, Austria.
| | - Martin Trötzmüller
- Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, Graz, Austria
| | - Astrid Knopf
- Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, Graz, Austria
| | - Jürgen Hartler
- Institute for Genomics and Bioinformatics, Graz University of Technology, Graz, Austria
| | - Anita Eberl
- Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, Graz, Austria
| | | | - Ernst Lankmayr
- Institute of Analytical Chemistry and Food Chemistry Graz University of Technology, Graz, Austria
| | - Friedrich Spener
- Department of Molecular Biology and Biochemistry Medical University of Graz, Graz, Austria; Department of Molecular Biosciences University of Graz, Graz, Austria
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Blouin CM, Le Lay S, Eberl A, Köfeler HC, Guerrera IC, Klein C, Le Liepvre X, Lasnier F, Bourron O, Gautier JF, Ferré P, Hajduch E, Dugail I. Lipid droplet analysis in caveolin-deficient adipocytes: alterations in surface phospholipid composition and maturation defects. J Lipid Res 2009; 51:945-56. [PMID: 19965594 PMCID: PMC2853462 DOI: 10.1194/jlr.m001016] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Caveolins form plasmalemnal invaginated caveolae. They also locate around intracellular lipid droplets but their role in this location remains unclear. By studying primary adipocytes that highly express caveolin-1, we characterized the impact of caveolin-1 deficiency on lipid droplet proteome and lipidome. We identified several missing proteins on the lipid droplet surface of caveolin-deficient adipocytes and showed that the caveolin-1 lipid droplet pool is organized as multi-protein complexes containing cavin-1, with similar dynamics as those found in caveolae. On the lipid side, caveolin deficiency did not qualitatively alter neutral lipids in lipid droplet, but significantly reduced the relative abundance of surface phospholipid species: phosphatidylserine and lysophospholipids. Caveolin-deficient adipocytes can form only small lipid droplets, suggesting that the caveolin-lipid droplet pool might be involved in lipid droplet size regulation. Accordingly, we show that caveolin-1 concentration on adipocyte lipid droplets positively correlated with lipid droplet size in obese rodent models and human adipocytes. Moreover, rescue experiments by caveolin- green fluorescent protein in caveolin-deficient cells exposed to fatty acid overload demonstrated that caveolin-coated lipid droplets were able to grow larger than caveolin-devoid lipid droplets. Altogether, these data demonstrate that the lipid droplet-caveolin pool impacts on phospholipid and protein surface composition of lipid droplets and suggest a functional role on lipid droplet expandability.
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Affiliation(s)
- Cédric M Blouin
- Centre de Recherche des Cordeliers, INSERM, U872, Université Pierre et Marie Curie - Paris 6, France
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Eberl A, Heumann S, Brückner T, Araujo R, Cavaco-Paulo A, Kaufmann F, Kroutil W, Guebitz GM. Enzymatic surface hydrolysis of poly(ethylene terephthalate) and bis(benzoyloxyethyl) terephthalate by lipase and cutinase in the presence of surface active molecules. J Biotechnol 2009; 143:207-12. [DOI: 10.1016/j.jbiotec.2009.07.008] [Citation(s) in RCA: 146] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2009] [Revised: 07/03/2009] [Accepted: 07/10/2009] [Indexed: 11/25/2022]
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Blouin CM, Le Lay S, Eberl A, Köfeler HC, Guerrera IC, Bourron O, Hajduch E, Dugail I. Adipocyte caveolin-1 lipid droplet pool is critical for size enlargement by regulating the organelle surface composition. Chem Phys Lipids 2009. [DOI: 10.1016/j.chemphyslip.2009.06.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Almansa E, Heumann S, Eberl A, Fischer-Colbrie G, Martinkova L, Marek J, Cavaco-Paulo A, Guebitz GM. Enzymatic surface hydrolysis of PET enhances bonding in PVC coating. BIOCATAL BIOTRANSFOR 2009. [DOI: 10.1080/10242420802357613] [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: 10/21/2022]
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26
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Liebminger S, Eberl A, Sousa F, Heumann S, Fischer-Colbrie G, Cavaco-Paulo A, Guebitz GM. Hydrolysis of PET and bis-(benzoyloxyethyl) terephthalate with a new polyesterase fromPenicillium citrinum. BIOCATAL BIOTRANSFOR 2009. [DOI: 10.1080/10242420701379734] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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27
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Almansa E, Heumann S, Eberl A, Kaufmann F, Cavaco-paulo A, Gübitz GM. Surface hydrolysis of polyamide with a new polyamidase fromBeauveriabrongniartii. BIOCATAL BIOTRANSFOR 2009. [DOI: 10.1080/10242420802323433] [Citation(s) in RCA: 9] [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: 10/21/2022]
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28
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Brueckner T, Eberl A, Heumann S, Rabe M, Guebitz GM. Enzymatic and chemical hydrolysis of poly(ethylene terephthalate) fabrics. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.22952] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.4] [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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29
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Eberl A, Heumann S, Kotek R, Kaufmann F, Mitsche S, Cavaco-Paulo A, Gübitz G. Enzymatic hydrolysis of PTT polymers and oligomers. J Biotechnol 2008; 135:45-51. [DOI: 10.1016/j.jbiotec.2008.02.015] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2007] [Revised: 02/04/2008] [Accepted: 02/18/2008] [Indexed: 10/22/2022]
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Ranz A, Eberl A, Maier E, Lankmayr E. Microwave-assisted derivatization of acidic herbicides for gas chromatography-mass spectrometry. J Chromatogr A 2008; 1192:282-8. [PMID: 18405907 DOI: 10.1016/j.chroma.2008.03.076] [Citation(s) in RCA: 27] [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] [Received: 12/21/2007] [Revised: 02/29/2008] [Accepted: 03/26/2008] [Indexed: 12/01/2022]
Abstract
Microwave radiation is used to speed up chemical derivatization. In the present study, three microwave-assisted techniques for the methylation of chlorophenoxy acid herbicides prior to analysis by gas chromatography coupled with mass spectrometry are compared. Derivatization was performed with the catalysts sulphuric acid and boron trifluoride as well as with trimethylsilyldiazomethane. In order to establish optimized and stable conditions, a screening for statistically significant factors by means of experimental designs was carried out and supplemented by a careful optimization. Special emphasis has been given to an accurate validation to prove the performance of the techniques. Furthermore, all microwave-assisted methods were compared with their conventional analogues. The optimized methods are valid for routine analysis of different matrices such as water, soil, sediment or tissues, especially for high sample throughput since a simultaneous derivatization of up to 64 samples in one run is possible.
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Affiliation(s)
- Andreas Ranz
- Institute of Analytical Chemistry and Radiochemistry, Graz University of Technology, Technikerstrasse 4, 8010 Graz, Austria
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Saueressig U, Eberl A, Frydrychowicz A, Pache G, Foell D, Bley TA, Langer M. Strahlenexposition in der 64-Zeilen Computertomographie des Herzens: Abhängigkeit von Scanlänge, EKG-abhängiger Dosismodulation und Geschlecht. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-977141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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32
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Heumann S, Eberl A, Pobeheim H, Liebminger S, Fischer-Colbrie G, Almansa E, Cavaco-Paulo A, Gübitz GM. New model substrates for enzymes hydrolysing polyethyleneterephthalate and polyamide fibres. ACTA ACUST UNITED AC 2006; 69:89-99. [PMID: 16624419 DOI: 10.1016/j.jbbm.2006.02.005] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.3] [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: 11/04/2005] [Revised: 02/08/2006] [Accepted: 02/09/2006] [Indexed: 11/28/2022]
Abstract
Recently the potential of enzymes for surface hydrophilisation and/or functionalisation of polyethyleneterephthalate (PET) and polyamide (PA) has been discovered. However, there was no correlation between enzyme class/activity (e.g. esterase, lipase, cutinase) and surface hydrolysis of these polymers and consequently no simple assay to estimate this capability. Enzymes active on the model substrates bis (benzoyloxyethyl) terephthalate and adipic acid bishexyl-amide, were also capable of increasing the hydrophilicity of PET and PA. When dosed at the identical activity on 4-nitrophenyl butyrate, only enzymes from Thermobifida fusca, Aspergillus sp., Beauveria sp. and commercial enzymes (TEXAZYME PES sp5 and Lipase PS) increased the hydrophilicity of PET fibres while other esterases and lipases did not show any effect. Activity on PET correlated with the activity on the model substrate. Hydrophilicity of fibres was greatly improved based on increases in rising height of up to 4.3 cm and the relative decrease of water absorption time between control and sample of the water was up to 76%. Similarly, enzymes increasing the hydrophilicity of PA fibres such as from Nocardia sp., Beauveria sp. and F. solani hydrolysed the model substrate; however, there was no common enzyme activity (e.g. protease, esterase, amidase) which could be attributed to all these enzymes.
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Affiliation(s)
- Sonja Heumann
- Research Centre Applied Biocatalysis, Petersgasse 14, A-8010 Graz, Austria
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Fritsche G, Eberl A, Katsarava Z, Limmroth V, Diener HC. Drug-induced headache: long-term follow-up of withdrawal therapy and persistence of drug misuse. Eur Neurol 2001; 45:229-35. [PMID: 11385260 DOI: 10.1159/000052134] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.5] [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: 11/19/2022]
Abstract
Patients suffering from migraine, tension-type headache (TTH), or combined headache (CH) are at risk of developing drug-induced headache (DIH) due to regular use of analgesics, ergot alkaloids, and triptans. The aim of our study was to determine (1) the clinical features of DIH, (2) the outcome of withdrawal therapy using high methodological standards, and (3) predictors which could explain the high relapse rate (more than 40%) after a previously successful withdrawal therapy. We retrospectively reviewed 103 patients with migraine or TTH who underwent withdrawal therapy between 1994 and 1998. The long-term follow-up (2-4 years after therapy) was conducted by phone and by specially trained psychologists using a structured interview which enclosed characteristics of headache and medication behavior as well as patients global assessment of success. Complete sets of data were available from 83 patients (38 migraine, 26 TTH, 19 CH). The most frequently abused drugs were caffeine-combined analgesics (24%), followed by caffeine-combined ergotamines (19%), pure ergot alkaloids (17%), and monoanalgesics (17%). 48.5% of the patients suffered an abuse relapse within 4 years and developed the complete features of DIH again. Analgesic and ergot alkaloid combinations with caffeine lead significantly more often to a relapse. A long-term successful therapy is connected with a significant reduction of the frequency of headache attacks. Under relapse conditions, the patients reached their former headache frequency level. The data show a higher relapse rate than previously assumed and that certain substance groups bear a higher relapse risk.
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Affiliation(s)
- G Fritsche
- Department of Neurology, University of Essen, Germany.
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