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Reinartz S, Lieber S, Pesek J, Brandt DT, Asafova A, Finkernagel F, Watzer B, Nockher WA, Nist A, Stiewe T, Jansen JM, Wagner U, Konzer A, Graumann J, Grosse R, Worzfeld T, Müller-Brüsselbach S, Müller R. Cell type-selective pathways and clinical associations of lysophosphatidic acid biosynthesis and signaling in the ovarian cancer microenvironment. Mol Oncol 2018; 13:185-201. [PMID: 30353652 PMCID: PMC6360368 DOI: 10.1002/1878-0261.12396] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [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: 09/01/2018] [Revised: 10/02/2018] [Accepted: 10/14/2018] [Indexed: 12/18/2022] Open
Abstract
The peritoneal fluid of ovarian carcinoma patients promotes cancer cell invasion and metastatic spread with lysophosphatidic acid (LPA) as a potentially crucial mediator. However, the origin of LPA in ascites and the clinical relevance of individual LPA species have not been addressed. Here, we show that the levels of multiple acyl‐LPA species are strongly elevated in ascites versus plasma and are associated with short relapse‐free survival. Data derived from transcriptome and secretome analyses of primary ascite‐derived cells indicate that (a) the major route of LPA synthesis is the consecutive action of a secretory phospholipase A2 (PLA2) and autotaxin, (b) that the components of this pathway are coordinately upregulated in ascites, and (c) that CD163+CD206+ tumor‐associated macrophages play an essential role as main producers of PLA2G7 and autotaxin. The latter conclusion is consistent with mass spectrometry‐based metabolomic analyses of conditioned medium from ascites cells, which showed that tumor‐associated macrophages, but not tumor cells, are able to produce 20:4 acyl‐LPA in lipid‐free medium. Furthermore, our transcriptomic data revealed that LPA receptor (LPAR) genes are expressed in a clearly cell type‐selective manner: While tumor cells express predominantly LPAR1‐3, macrophages and T cells also express LPAR5 and LPAR6 at high levels, pointing to cell type‐selective LPA signaling pathways. RNA profiling identified cytokines linked to cell motility and migration as the most conspicuous class of LPA‐induced genes in macrophages, suggesting that LPA exerts protumorigenic properties at least in part via the tumor secretome.
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Affiliation(s)
- Silke Reinartz
- Clinic for Gynecology, Gynecological Oncology and Gynecological Endocrinology, Center for Tumor Biology and Immunology (ZTI), Marburg, Germany
| | - Sonja Lieber
- Center for Tumor Biology and Immunology (ZTI), Institute of Molecular Biology and Tumor Research (IMT), Marburg, Germany
| | - Jelena Pesek
- Metabolomics Core Facility, Philipps University, Marburg, Germany
| | | | - Alina Asafova
- Clinic for Gynecology, Gynecological Oncology and Gynecological Endocrinology, Center for Tumor Biology and Immunology (ZTI), Marburg, Germany.,Center for Tumor Biology and Immunology (ZTI), Institute of Molecular Biology and Tumor Research (IMT), Marburg, Germany
| | - Florian Finkernagel
- Center for Tumor Biology and Immunology (ZTI), Institute of Molecular Biology and Tumor Research (IMT), Marburg, Germany
| | - Bernard Watzer
- Metabolomics Core Facility, Philipps University, Marburg, Germany
| | | | - Andrea Nist
- Genomics Core Facility, Philipps University, Marburg, Germany
| | - Thorsten Stiewe
- Genomics Core Facility, Philipps University, Marburg, Germany
| | - Julia M Jansen
- Clinic for Gynecology, Gynecological Oncology and Gynecological Endocrinology, UKGM, Marburg, Germany
| | - Uwe Wagner
- Clinic for Gynecology, Gynecological Oncology and Gynecological Endocrinology, UKGM, Marburg, Germany
| | - Anne Konzer
- Biomolecular Mass Spectrometry, Max-Planck-Institute for Heart and Lung Research, Bad Nauheim, Germany.,German Centre for Cardiovascular Research (DZHK), Kerckhoff Klinik, Bad Nauheim, Germany
| | - Johannes Graumann
- Biomolecular Mass Spectrometry, Max-Planck-Institute for Heart and Lung Research, Bad Nauheim, Germany.,German Centre for Cardiovascular Research (DZHK), Kerckhoff Klinik, Bad Nauheim, Germany
| | | | - Thomas Worzfeld
- Institute of Pharmacology, Marburg, Germany.,Department of Pharmacology, Max-Planck-Institute for Heart and Lung Research, Bad Nauheim, Germany
| | - Sabine Müller-Brüsselbach
- Center for Tumor Biology and Immunology (ZTI), Institute of Molecular Biology and Tumor Research (IMT), Marburg, Germany
| | - Rolf Müller
- Center for Tumor Biology and Immunology (ZTI), Institute of Molecular Biology and Tumor Research (IMT), Marburg, Germany
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Schreiver C, Jacoby U, Watzer B, Thomas A, Haffner D, Fischer DC. Glycaemic variability in paediatric patients with type 1 diabetes on continuous subcutaneous insulin infusion (CSII) or multiple daily injections (MDI): a cross-sectional cohort study. Clin Endocrinol (Oxf) 2013; 79:641-7. [PMID: 23134485 DOI: 10.1111/cen.12093] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 10/16/2012] [Accepted: 11/01/2012] [Indexed: 11/30/2022]
Abstract
OBJECTIVE This cross-sectional observational cohort study was designed to investigate i) whether glycaemic variability in paediatric patients with type 1 diabetes is lower in those using an insulin pump (CSII) compared with those using multiple daily insulin injections (MDI) and ii) whether urinary F2 -isoprostanes and/or urinary prostaglandin F2 excretion as surrogate marker of oxidative stress and cyclooxygenase activity are associated with glycaemic variability. METHODS 48 paediatric patients with type 1 diabetes (22 using an insulin pump) underwent an ambulatory 3-day continuous glucose monitoring. All patients continued with normal daily activities and collected urine for two consecutive 24 h periods. The glucose pentagon was used to calculate the glycaemic risk parameter. RESULTS Insulin requirements, HDL-cholesterol, the mean of glycaemic excursions (P < 0·01) and the standard deviation of mean glucose concentration (P < 0·05) were significantly lower in patients with CSII compared with those using MDI. By contrast, averaged HbA1c during the last twelve months as well as at the time of sensor insertion did not differ significantly between both groups. Summarizing characteristic parameter of acute and long-term metabolic control into the glucose pentagon revealed a significantly lower glycaemic risk parameter in CSI patients compared with both, healthy subjects and patients using MDI (P < 0·05). CONCLUSIONS Paediatric patients with type 1 diabetes using an insulin pump presented with lower glycaemic variability and a concomitantly lower glycaemic risk parameter compared with those using MDII. Whether these findings translate into a lower risk of diabetes associated cardiovascular complications remains to be elucidated.
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Affiliation(s)
- C Schreiver
- Department of Paediatrics, University Hospital Rostock, Hannover, Germany
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3
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Sioutas A, Sandstrom A, Fiala C, Watzer B, Schweer H, Gemzell-Danielsson K. Effect of bacterial vaginosis on the pharmacokinetics of misoprostol in early pregnancy. Hum Reprod 2011; 27:388-93. [DOI: 10.1093/humrep/der407] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Lee VCY, Yung SSF, Li RHW, Watzer B, Schweer H, Ng EHY, Ho PC. A randomized comparison of pharmacokinetics of a single vaginal dose of dry misoprostol or misoprostol moistened with normal saline or with acetic acid. Hum Reprod 2011; 26:2981-7. [DOI: 10.1093/humrep/der303] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Watzer B, Trübner K, Schweer H. Versuchte illegale Herbeiführung eines Schwangerschaftsabbruchs ohne Wissen der Schwangeren mittels Cytotec (Misoprostol)–massenspektrometrisch toxikologischer Nachweis via GC- und LC/MS/MS. Klin Padiatr 2010. [DOI: 10.1055/s-0030-1251072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Rogosch T, Watzer B, Lichtman AH, Di Marzo V, Imming P, Nüsing R. Ein möglicher Wirkmechanismus von Metamizol. Klin Padiatr 2010. [DOI: 10.1055/s-0030-1251046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Aronsson A, Fiala C, Stephansson O, Granath F, Watzer B, Schweer H, Gemzell-Danielsson K. O56 Pharmacokinetic profiles up to 12 h after administration of vaginal, sublingual and slow-release oral misoprostol. Int J Gynaecol Obstet 2009. [DOI: 10.1016/s0020-7292(09)60428-8] [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: 11/29/2022]
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Graff J, Skarke C, Klinkhardt U, Watzer B, Harder S, Seyberth H, Geisslinger G, Nüsing RM. Effects of selective COX-2 inhibition on prostanoids and platelet physiology in young healthy volunteers. J Thromb Haemost 2007; 5:2376-85. [PMID: 17916229 DOI: 10.1111/j.1538-7836.2007.02782.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Selective inhibitors of cyclooxygenase-2 (COX-2) called coxibs, are effective anti-inflammatory and analgesic drugs. Recently, these drugs were associated with an increased risk for myocardial infarction and atherothrombotic events. The hypothesis of thromboxane-prostacyclin imbalance has been preferred to explain these unwanted effects. METHODS We studied the effects of 14 days intake of rofecoxib (25 mg q.d.), celecoxib (200 mg b.i.d.), naproxen (500 mg b.i.d.) and placebo in a randomized, blinded, placebo-controlled study in young healthy volunteers (median age 25-30 years, each group n = 10). We assessed prostanoid metabolite excretion (PGE-M, TXB(2), 6-keto-PGF(1alpha), 11-dehydro-TXB(2), 2,3-dinor-TXB(2), and dinor-6-keto-PGF(1alpha)), the expression of platelet activation markers (CD62P, PAC-1, fibrinogen), platelet-leukocyte formation, the endogenous thrombin potential, platelet cAMP content and plasma thrombomodulin level. RESULTS Naproxen suppressed biosynthesis of PGE-M, prostacyclin metabolites and thromboxane metabolites and thrombomodulin levels. In contrast, both coxibs had an inhibitory effect only on PGE-M, 6-keto-PGF(1alpha), and on dinor-6-keto-PGF(1alpha), whereas TXB(2), 2,3-dinor-TXB(2) and 11-dehydro-TXB(2) excretion were unaffected. None of the coxibs exerted significant effects on the expression of platelet activation markers, cAMP generation, platelet-leukocyte formation, or on thrombomodulin plasma levels. Interestingly, platelet TXB(2) release during aggregation was enhanced after coxib treatment following arachidonic acid or collagen stimulation. CONCLUSION In young healthy volunteers coxibs inhibit systemic PGE(2) and PGI(2) synthesis. Platelet function and expression of platelet aggregation markers are not affected; however, coxibs can stimulate TXB(2) release from activated platelets. Combined decrease in vasodilatory PGE(2) and PGI(2) together with increased TXA(2) in proaggregatory conditions may contribute to coxib side effects.
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Affiliation(s)
- J Graff
- Pharmazentrum Frankfurt/ZAFES, Institute of Clinical Pharmacology, Johann Wolfgang Goethe University, Theodor Stern Kai 7, Frankfurt am Main, Germany
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Aronsson A, Fiala C, Stephansson O, Granath F, Watzer B, Schweer H, Gemzell-Danielsson K. Pharmacokinetic profiles up to 12 h after administration of vaginal, sublingual and slow-release oral misoprostol. Hum Reprod 2007; 22:1912-8. [PMID: 17488782 DOI: 10.1093/humrep/dem098] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND It has been shown that the route of administration of misoprostol has a strong impact on the pharmacokinetic profile and result in different clinical efficacy. No study has so far evaluated the pharmacokinetics beyond 6 hours. Furthermore a new slow-release misoprostol formulation was included in the study. METHODS Pharmacokinetics of a novel slow-release (SR) oral misoprostol was compared during 12 h after administration to conventional misoprostol administered vaginally or sublingually. Thirty-three women requesting surgical abortion up to 12 weeks were randomly allocated to groups receiving a single dose of 400 microg conventional misoprostol administered vaginally or sublingually or 800 microg SR oral misoprostol. Blood samples were taken before (0 h) and 0.5, 1, 2, 3, 4, 6, 8, 10 and 12 h after misoprostol administration. Misoprostol acid (MPA) was determined in serum samples using liquid chromatography/tandem mass spectrometry. RESULTS Three women did not complete the study. Serum concentrations reached their highest level following sublingual misoprostol (P<0.0001) and the time to peak concentration was shortest for this group (P=0.0094). The area under the curve (AUC) up to 12 h was greater following sublingual treatment than for the other alternatives (P<0.0001) and lowest for SR misoprostol. Cumulative serum levels of MPA did not increase beyond 6 h following sublingual and vaginal administration, while they continued to increase up to 12 h following SR misoprostol. CONCLUSIONS The new SR form of misoprostol demonstrated lower peak levels and a lower AUC but longer lasting elevation in serum levels when compared to conventional misoprostol administered sublingually or vaginally. SR misoprostol may offer an alternative to repeated administration of conventional misoprostol.
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Affiliation(s)
- A Aronsson
- Department of Woman and Child Health, Division for Obstetrics and Gynaecology, Karolinska University Hospital, Karolinska Institutet, SE-171 76 Stockholm, Sweden.
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Fiala C, Aronsson A, Granath F, Stephansson O, Seyberth HW, Watzer B, Gemzell-Danielsson K. Pharmacokinetics of a novel oral slow-release form of misoprostol. Hum Reprod 2005; 20:3414-8. [PMID: 16055461 DOI: 10.1093/humrep/dei229] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [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: 11/13/2022] Open
Abstract
BACKGROUND The pharmacokinetics of a novel slow-release (SR) misoprostol was studied and compared to conventional misoprostol. METHODS Thirty-one women, pregnant between 8 and 12 weeks, requesting surgical abortion were randomly allocated to receive orally 400 microg conventional misoprostol, 400 microg SR misoprostol or 800 microg SR misoprostol. Venous blood samples were taken at 0, 30, 60, 120, 240 and 360 min after the administration of misoprostol. Misoprostol acid (MPA) was determined in serum samples using liquid chromatography/tandem mass spectrometry. RESULTS Serum peak concentration (Cmax) was highest for conventional oral misoprostol. The time to peak concentration (Tmax) was similar for all groups. The area under the curve up to 360 min was similar for conventional and for 800 microg SR misoprostol and significantly greater for these groups compared to 400 microg SR misoprostol (P = 0.013). CONCLUSION The new SR form of misoprostol demonstrated lower peak levels but longer-lasting elevation in plasma levels compared to conventional oral misoprostol. The AUC for 800 microg SR misoprostol was similar to that of 400 microg of conventional oral misoprostol. SR misoprostol may offer an alternative to repeated administration of oral misoprostol or to vaginal administration.
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Affiliation(s)
- C Fiala
- Department of Woman and Child Health, Division for Obstetrics and Gynaecology, Karolinska Institutet, S-171 76 Stockholm, Sweden.
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Stier C, Schweer H, Jelinek J, Watzer B, Seyberth HW, Leonhardt A. Effect of preterm formula with and without long-chain polyunsaturated fatty acids on the urinary excretion of F2-isoprostanes and 8-epi-prostaglandin F2alpha. J Pediatr Gastroenterol Nutr 2001; 32:137-41. [PMID: 11321381 DOI: 10.1097/00005176-200102000-00008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
BACKGROUND The objective of this study was to evaluate the effect of conventional and long-chain polyunsaturated fatty acids (LCP)-enriched preterm formula on the endogenous formation of F2-isoprostanes and 8-epi-prostaglandin (PG) F2alpha as possible markers of lipid peroxidation in preterm infants during their first weeks of life. METHODS In a prospective, randomized, double-blind study, infants received either formula enriched with LCP (n = 8), standard preterm formula (n = 7), or (expressed) breast milk (n = 8). Urine was sampled at study entry and after the study period of 3 weeks. The formation of F2-isoprostanes and 8-epi-PGF2alpha was evaluated by measuring the urinary excretion by gas chromatography-mass spectrometry. RESULTS No differences in the urinary excretion of F2-isoprostanes and 8-epi-PGF2alpha were observed at the end of the study period. CONCLUSIONS This result suggests that supplementation of a preterm formula with LCP for a period of 3 weeks does not stimulate lipid peroxidation in preterm infants.
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Affiliation(s)
- C Stier
- Department of Pediatrics, Philipps University, Marburg, Germany
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Watzer B, Reinalter S, Seyberth HW, Schweer H. Determination of free and glucuronide conjugated 20-hydroxyarachidonic acid (20-HETE) in urine by gas chromatography/negative ion chemical ionization mass spectrometry. Prostaglandins Leukot Essent Fatty Acids 2000; 62:175-81. [PMID: 10841040 DOI: 10.1054/plef.2000.0138] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
20-Hydroxy-arachidonic acid (20-HETE) was determined in urine by an isotope dilution assay using gas chromatography/mass spectrometry (GC/MS). After addition of 18O2-internal standard, 20-HETE was extracted from urine with hexane either directly or after treatment with glucuronidase. 20-HETE was derivatized to the pentafluorobenzylester and the sample was applied to thin layer chromatography with iso-octane/iso-propanol 9:1 (v/v) as the developing solvent. The corresponding zone was extracted and 20-HETE was hydrogenated. After derivatization to the trimethylsilylether, 20-HETE was determined by GC/MS using the [M-pentafluorobenzyl]- -ion in the negative ion chemical ionization mode. Excretion rates of free and glucuronide conjugated 20-HETE was determined in healthy children and in children with hyperprostaglandin-E-syndrome/antenatal Bartter syndrome (HPS/aBS) with or without indomethacin treatment. Compared to the controls, the HPS/aBS children showed higher excretion rates of 20-HETE, which were suppressed to normal values under indomethacin medication. Free and glucuronide conjugated 20-HETE do not correlate with PGE2 excluding any participation in HPS/aBS.
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Affiliation(s)
- B Watzer
- Department of Pediatrics, Philipps University Marburg, Germany
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13
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Abstract
Urinary excretion of prostanoids prostaglandin E2 (PGE2), PGE-M (7alpha-hydroxy-5,11-diketo-2,3,4,5,20-penta-19-carboxyprostano ic acid), 6-keto-PGF1alpha, 2,3-dinor-6-keto-PGF1alpha, thromboxane B2 (TxB2) 2,3-dinor-TxB2 and 11-dehydro-TxB2 was determined by gas chromatography/mass spectrometry in preterm and term infants to show that there is an age-dependent excretion rate of the above prostanoids in infants this young. Group I included premature children with normal postnatal development, Groups II and III included term children who were admitted in the neonatal period for observation because of feeding problems but who were subsequently found to be completely healthy. We present normal data of three primary prostanoids and four prostanoid metabolites. In Group I, excretion rates of 2,3-dinor-TxB2 were significantly lower than in Group II (P = 0.04) and in Group III (P = 0.05). Furthermore, the excretion rate of 11-dehydro-TxB2 in group I was significantly lower than in Group II (P = 0.05). We found no significant age-dependent differences between the three groups in excretion rates of PGE2, PGE-M, 6-keto-PGF1alpha, 2,3-dinor-6-keto-PGF1alpha, and TxB2.
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Affiliation(s)
- B Hoch
- Department of Pediatrics, University of Marburg, Germany.
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Schweer H, Watzer B, Seyberth HW, Nüsing RM. Improved quantification of 8-epi-prostaglandin F2 alpha and F2-isoprostanes by gas chromatography/triple-stage quadrupole mass spectrometry: partial cyclooxygenase-dependent formation of 8-epi-prostaglandin F2 alpha in humans. J Mass Spectrom 1997; 32:1362-1370. [PMID: 9423285 DOI: 10.1002/(sici)1096-9888(199712)32:12<1362::aid-jms606>3.0.co;2-n] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
F2-isoprostanes are considered to be novel markers of lipid peroxidation. To study the in vivo formation of F2-isoprostanes, an improved method was developed for isotope dilution assays involving gas chromatography/triple-stage quadrupole mass spectrometry (GC/MS/MS) including thin-layer chromatography (TLC) (sum of all F2-isoprostanes) and high-performance liquid chromatographic (HPLC) purification (prostaglandin F2 alpha (PGF2 alpha) and 8-epi-PGF2 alpha). Following the addition of isotopically labeled prostaglandins to urine, the sample was acidified and applied to a C18 cartridge. After elution, prostaglandins were derivatized to pentafluorobenzyl esters and subjected to TLC. A broad zone was scratched off, isoprostanes were eluted and after formation of their trimethylsilyl ether derivatives the sum of F2-isoprostanes was determined by GC/MS/MS. For the determination of PGE2 alpha and 8-epi-PGF2 alpha prior to trimethylsilylation an additional HPLC step was performed and the fractions containing PGF2 alpha and 8-epi-PGF2 alpha were analyzed by GC/MS/MS. Using this technique, 8-epi-PGF2 alpha concentrations in urine samples as low as 5 pg ml-1 could be determined with high accuracy. The excretion rates of isoprostanes were studied in comparison with the classical prostaglandins in three different groups: healthy adults, healthy children and children with hyper-PGE syndrome (HPS), a pathological situation associated with a stimulated PGE2 synthesis. F2-isoprostanes represented the main arachidonic acid metabolites in these groups and 8-epi-PGF2 alpha excretion was comparable in its amount to the classical prostanoids. To delineate the cyclooxygenase-catalyzed contribution, the influence of indomethacin, an inhibitor of cyclooxygenases, on F2-isoprostane formation in healthy adults and in HPS children was analyzed. Significantly decreased excretion rates were observed 2 days after indomethacin administration for all prostanoids, including F2-isoprostanes and 8-epi-PGF2 alpha. However, the suppression of F2-isoprostanes and 8-epi-PGF2 alpha excretion rates was less pronounced in comparison with the classical prostanoids. An improved and reliable method for the determination of F2-isoprostanes and especially 8-epi-PGF2 alpha has been developed. The data obtained on human urine samples indicates a contribution of the cyclooxygenase pathway to the formation of isoprostanes.
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Affiliation(s)
- H Schweer
- Children's Hospital, Philipps University Marburg, Germany
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Stier C, Hess M, Watzer B, Schweer H, Seyberth HW, Leonhardt A. Prostanoid formation during feeding of a preterm formula with long-chain polyunsaturated fatty acids in healthy preterm infants during the first weeks of life. Pediatr Res 1997; 42:509-13. [PMID: 9380445 DOI: 10.1203/00006450-199710000-00015] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The objective of this study was to evaluate the effect of conventional and long-chain polyunsaturated fatty acids (LCP)-enriched preterm formula on prostanoid formation in preterm infants during their first weeks of life. In a prospective, randomized, double-blind study, healthy infants received either formula enriched with LCP (n = 10), standard preterm formula (n = 10), or (expressed) breast milk (n = 10). Urine was sampled, and anthropometric measurements were taken at study entry and after the study period of 3 wk. In vivo formation of prostaglandin E2, thromboxane A2, and prostacyclin was evaluated by measuring the urinary excretion of the respective index metabolities by gas chromatography-mass spectrometry. There were no significant differences in urinary prostanoid excretion and anthropometric data between the groups at the end of the study period. We conclude that neither conventional formula nor supplementation of a preterm formula with LCP for a period of 3 wk substantially influence prostanoid formation in healthy preterm infants.
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Affiliation(s)
- C Stier
- Department of Pediatrics, Philipps University Marburg, Germany
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Schweer H, Watzer B, Seyberth HW, Steinmetz A, Schaefer JR. Determination of isotopic ratios of L-leucine and L-phenylalanine and their stable isotope labeled analogues in biological samples by gas chromatography/triple-stage quadrupole mass spectrometry. J Mass Spectrom 1996; 31:727-734. [PMID: 8799305 DOI: 10.1002/(sici)1096-9888(199607)31:7<727::aid-jms347>3.0.co;2-o] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A gas chromatographic/triple-stage quadrupole mass spectrometric (GC/MS/MS) method for measuring very low levels of enrichment of [5,5,5-2H3]-L-leucine and [ring-13C6]-L-phenylalanine in plasma and lipoprotein hydrolysates is described. The amino acids were derivatized to their N-heptafluorobutyryl isobutyl ester derivatives and the isotope ratio was determined by GC/MS/MS in the negative-ion chemical ionization mode. Parent ions were the [M-HF]- ions and fragment ions used for quantification were [P-2HF-C3H7]- (leucine) and [P-HF-OC4H9]- (phenylalanine), respectively. The limit of quantification was about 10 pg of the labeled compound co-eluting with 20 ng of the endogenous compound. The calibration curves were linear in the investigated range from 0.1% to 100% of the labeled compound. In biological samples, the higher selectivity of GC/MS/MS compared with GC/MS was demonstrated.
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Affiliation(s)
- H Schweer
- Children's Hospital, Philipps University Marburg, Germany
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Schweer H, Meese CO, Watzer B, Seyberth HW. Determination of prostaglandin E1 and its main plasma metabolites 15-keto-prostaglandin E0 and prostaglandin E0 by gas chromatography/negative ion chemical ionization triple-stage quadrupole mass spectrometry. Biol Mass Spectrom 1994; 23:165-70. [PMID: 8148408 DOI: 10.1002/bms.1200230308] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Prostaglandin E1 (PGE1), 15-keto-PGE0 and PGE0 in plasma were determined in an isotope dilution assay by gas chromatography/triple-stage quadrupole mass spectrometry. After addition of deuterated internal standards, the prostaglandins were extracted by a solid-phase cartridge and derivatized to the pentafluorobenzyl ester methoxime. The samples were purified by thin-layer chromatography, converted to the trimethylsilyl ethers and quantified by gas chromatography/triple-stage quadrupole mass spectrometry. The parent ions in the negative ion chemical ionization mode were [M-pentafluorobenzyl]- ([P]-), the daughter ions used for quantification were [P-(CH3)3SiOH]- (PGE0 and 15-keto-PGE0) and [P-2(CH3)3SiOH]- (PGE1), respectively. Plasma concentrations in healthy subjects were at about 1-3 pg ml-1 for PGE1 and PGE0 and 2-15 pg ml-1 for 15-keto-PGE0. After infusion of 60 micrograms PGE1 in 2 h, the concentrations in plasma were 3-10 pg ml-1 for PGE1, 8-17 pg ml-1 for PGE0 and 115-205 pg ml-1 for 15-keto-PGE0.
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Affiliation(s)
- H Schweer
- Children's Hospital, Phillips University Marburg, Germany
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Schweer H, Watzer B, Seyberth HW. Determination of seven prostanoids in 1 ml of urine by gas chromatography-negative ion chemical ionization triple stage quadrupole mass spectrometry. J Chromatogr 1994; 652:221-7. [PMID: 8006107 DOI: 10.1016/0378-4347(93)e0408-i] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
In an isotope dilution assay, prostaglandin (PG) E2, 6-keto-PGF1 alpha, thromboxane (Tx) B2 and their metabolites PGE-M (11 alpha-hydroxy-9,15-dioxo-2,3,4,5,20-pentanor-19-carboxyprostano ic acid), 2,3-dinor-6-keto-PGF1 alpha, 2,3-dinor-TxB2 and 11-dehydro-TxB2 were determined in urine by gas chromatography-triple stage quadrupole mass spectrometry (GC-MS-MS). After addition of deuterated internal standards, the prostaglandins were derivatized to their methoximes and extracted with ethyl acetate-hexane. The sample was further derivatized to the pentafluorobenzylesters and purified by thin-layer chromatography (TLC). Three zones were scraped from the TLC plate. The prostanoid derivatives were converted to their trimethylsilyl ethers and the products were quantified by GC-MS-MS. In each run, two or three prostanoids were determined.
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Affiliation(s)
- H Schweer
- Children's Hospital, Philipps University Marburg, Germany
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