Rudolph V.,University of Hamburg |
Keller T.,University of Hamburg |
Schulz A.,Johannes Gutenberg University Mainz |
Ojeda F.,University of Hamburg |
And 7 more authors.
Circulation: Cardiovascular Genetics
Background: Activation of leukocytes with release of myeloperoxidase (MPO) has been linked to acute coronary disease. To date, studies investigating the diagnostic and prognostic performance of circulating MPO in patients with chest pain (CP) are mainly retrospective, of low size, and lack a cut-off value for MPO. Herein, we prospectively assess the diagnostic and prognostic properties of MPO compared with sensitive troponin I (sTNI) in patients admitted to the emergency room with CP. Methods and Results: One thousand, eight hundred and eighteen consecutive patients (mean age, 61.4±13.5 years;33.6% female) admitted for CP underwent determination of MPO, sTnI, and B-natriuretic peptide plasma levels at admission and 3 hours and 6 hours thereafter. A cut-off for MPO was defined in 5000 population-based subjects. Baseline MPO levels were elevated in patients with acute myocardial infarction compared with patients with noncoronary C P. For all time-points accuracy of MPO was inferior to sTNI for predicting AMI. The sensitivity of MPO to diagnose AMI at presentation was 73.5% compared with 90.7% for sTNI, and the specificity of MPO was 45.5% as opposed to 90.2%. B-natriuretic peptide levels also failed to demonstrate independent diagnostic information. Both MPO and B-natriuretic peptide were predictive for increased risk of adverse events at 30 days and 6 months, whereas their predictive value was weakened after covariate adjustment. Conclusions: The data demonstrate that MPO and B-natriuretic peptide fail to provide incremental information for patients with acute onset CP when added to sensitive troponin. However, there is a potential value for both biomarkers as prognostic markers. © 2012 American Heart Association, Inc. Source
Nastaly P.,University of Hamburg |
Ruf C.,University of Hamburg |
Ruf C.,Helmut Schmidt University |
Becker P.,Helmut Schmidt University |
And 13 more authors.
Clinical Cancer Research
Purpose: Germ cell tumors (GCTs) represent the most frequent malignancies among young men, but little is known about circulating tumor cells (CTCs) in these tumors. Considering their heterogeneity, CTCs were investigated using two independent assays targeting germ cell tumor and epithelial cell-specific markers, and results were correlated with disease stage, histology, and serum tumor markers. Experimental Design: CTCs were enriched from peripheral blood (n = 143 patients) and testicular vein blood (TVB, n = 19 patients) using Ficoll density gradient centrifugation. For CTC detection, a combination of germ cell tumor (anti-SALL4, anti-OCT3/4) and epithelial cell-specific (anti-keratin, anti-EpCAM) antibodies was used. In parallel, 122 corresponding peripheral blood samples were analyzed using the CellSearch system. Results: In total, CTCs were detected in 25 of 143 (17.5%) peripheral blood samples, whereas only 11.5% of patients were CTC-positive when considering exclusively the CellSearch assay. The presence of CTCs in peripheral blood correlated with clinical stage (P < 0.001) with 41% of CTC positivity in patients with metastasized tumors and 100% in patients with relapsed and chemotherapy-refractory disease. Histologically, CTC-positive patients suffered more frequently from nonseminomatous primary tumors (P < 0.001), with higher percentage of yolk sac (P < 0.001) and teratoma (P = 0.004) components. Furthermore, CTC detection was associated with elevated serum levels of α-fetoprotein (AFP; P = 0.025), β-human chorionic gonadotropin (βHCG; P = 0.002), and lactate dehydrogenase (LDH; P = 0.002). Incidence and numbers of CTCs in TVB were much higher than in peripheral blood. Conclusions: The inclusion of germ cell tumor-specific markers improves CTC detection in GCTs. CTCs occur frequently in patients with more aggressive disease, and there is a gradient of CTCs with decreasing numbers from the tumor-draining vein to the periphery. ©2014 AACR. Source
Tzikas S.,University Medical Center Mainz |
Keller T.,Goethe University Frankfurt |
Ojeda F.M.,University of Hamburg |
Zeller T.,University of Hamburg |
And 9 more authors.
Objective To evaluate mid-regional pro-adrenomedullin (MR-proADM) and mid-regional pro-atrial natriuretic peptide (MR-proANP) as prognostic biomarkers in a representative 'real world' cohort of patients with suspected acute coronary syndrome (ACS). Design Prospective observational multicentre cohort study. Setting Chest pain units of three major hospitals in Germany from 2007 to 2008. Patients Patients presenting with signs and symptoms suggestive of an ACS. Main outcome measures Primary end point was death or non-fatal myocardial infarction (MI), and secondary end point was death, non-fatal MI, stroke, need for coronary revascularisation, and hospital admission for cardiovascular cause or acute heart failure within 6 months after enrolment. Results 1386 patients (male/female=920/466) were enrolled. Follow-up information was available for 97.8% of patients (median follow-up time 183 days). Forty-three patients reached the primary end point, and 132 the secondary end point. Patients who reached a primary end point had significantly higher MR-proANP (271 vs 101 pmol/l, p<0.001) and MR-proADM (0.86 vs 0.59 nmol/l, p<0.001) concentrations than those who did not. Cox regression analysis revealed a 2.55-fold risk of death or non fatal MI (95% CI 1.48 to 2.46, p<0.001) for an increment of the log-transformed MRproANP concentration by 1 SD after adjustment for cardiovascular risk factors, and a 1.91-fold risk (95% CI 1.48 to 2.46, p<0.001) for MR-proADM. Both peptides could result in significant reclassification of patients when added to the Global Registry of Acute Coronary Events risk score, with an overall net reclassification improvement of 41.2% for MR-proADM and 35.7% for MR-proANP. Conclusions MR-proADM and MR-proANP are predictors of future cardiovascular events in patients presenting with acute chest pain and might facilitate the choice of treatment in those patients complementary to established risk scores. Source
Beinke C.,University of Ulm |
Oestreicher U.,Federal office for Radiation Protection |
Riecke A.,Federal Armed Forces Hospital |
Kulka U.,Federal office for Radiation Protection |
And 2 more authors.
Radiation accidents with exposure of human beings can assume huge dimensions concerning occurring health impairments and essential medical resources such as personnel, patient care management and appropriate medical facilities. Particularly in mass-casualty events, a rapid sorting and allocation of victims to treatment is needed and their classification in medical treatment groups has to be conducted as fast as possible. For triage purposes several approaches can be considered. Clinical signs and symptoms are extremely helpful in estimating radiation effects on an organ-based level, whereas the assessment of radiation effects based on cytogenetic biodosimetry tools is the alternative approach. For both systems there are pros and cons with respect to the usefulness for specific applications, such as individual cases versus mass-casualty screening or whole- versus partial-body exposures. Among the biodosimetry tools the dicentric chromosome assay (DCA) is considered as the "gold standard" for biodosimetry after an acute radiation exposure. Recently, steady progress in standardization and harmonization of the DCA has occurred, in order to enable the validated performance of the DCA in the frame of cooperative response of biodosimetry networks during a large scale radiological scenario. Using the DCA in triage mode which allows the stratification of radiation exposed victims into broad 1.0 Gy categories only 20-50 metaphase cells per subject are scored instead of the 500-1000 scored for routine analysis. Our data show that there are significant differences between the dicentric yields after 1.0 Gy and 3.0 Gy γ-ray ex vivo exposure of blood suggesting this assay as suitable for the distinction between high and low dosed exposed individuals. These preliminary findings indicate the usefulness of the DCA also for therapeutic decision making. © 2011 Elsevier Ltd. All rights reserved. Source
Wree A.,University of Duisburg - Essen |
Mayer A.,University Medical Center Mainz |
Westphal S.,Federal Armed Forces Hospital |
Beilfuss A.,University of Duisburg - Essen |
And 4 more authors.
Journal of Endocrinological Investigation
Backgroud: Adipose tissue has emerged as an important endocrine regulator by secreting hormones referred to as adipokines. Recent studies showed that adipose tissue considerably responds to hypoxia. Although the impact of white adipose tissue on regulative processes is established, the importance of brown adipose tissue in adults has emerged just recently. Methods: Brown (BA) and white adipocytes (WA) were cultured either in the presence of chemical hypoxia-mimetics or under hypoxic atmosphere of 1% oxygen. Expression of hypoxia-inducible factor 1α (HIF-1α) was assessed by western blot. The expression levels of several known HIF-1α-regulated proteins [vascular endothelial growth factor (VEGF), leptin, adiponectin, and angiotensinogen (AGT)] were quantified. Results: Both chemical hypoxia-mimetics and physical hypoxia led to increased nuclear HIF-1α expression and to decreased cytoplasmatic adiponectin in both cell types. In contrast, VEGF and AGT expression did not change upon hypoxic stimulation. Leptin was exclusively detectable in WA, while uncoupling-protein 1 (UCP-1) was expressed in BA only. Conclusions: WA and BA are sensitive to hypoxia, in which HIF-1α expression is induced. Protein expression of adiponectin is hypoxia-dependent, whereas AGT, VEGF, leptin, and UCP-1 expression do not change secondary to hypoxia. ©2012, Editrice Kurtis. Source