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Staudte H.,University Hospitals Jena | Guntsch A.,University Hospitals Jena | Volpel A.,University Hospitals Jena | Sigusch B.W.,University Hospitals Jena
Archives of Oral Biology | Year: 2010

Objective: Periodontitis is induced by an imbalance between bacterial virulence and host defense ability involving increased levels of oxidative stress. The aim of this study was to investigate the influence of vitamin C on the cytotoxic effects of Porphyromonas gingivalis on human gingival fibroblasts (HGF). Methods: This in vitro study observed the interaction between HGF and P. gingivalis. HGF were cultured with medium containing vitamin C and exposed to P. gingivalis ATCC 33277 for a maximum of 180 min. The assessment of cell viability was followed by a 3-(4,5-dimethylthiazol-2-ly)-2,5-diphenyltetrazolium-bromide (MTT) assay. The apoptosis rate was detected by flow cytometry using Annexin-V-FITC and propidium iodide. Superoxide as an oxidative stress factor was measured photometrically by the reduction of ferricytochrome C. Results: Vitamin C reduced the cytotoxic effects of P. gingivalis on HGF. Vitamin C-treated HGF showed significantly higher cell viability rates (89.0 ± 5.7%) in comparison to untreated HGF (77.0 ± 5.0%; p < 0.05). In vitamin C-treated HGF, lower apoptosis rates (40.0 ± 2.2%) were observed after P. gingivalis exposure than in untreated HGF (66.1 ± 1.6%; p < 0.05). The exposure of HGF to P. gingivalis led to a significant increase of superoxide concentration, but this effect was not influenced by vitamin C. Conclusion: Vitamin C reduces the cytotoxic and apoptotic effects of P. gingivalis on HGF in vitro. These results suggest that the benefit of vitamin C should be further investigated clinically. © 2009 Elsevier Ltd. All rights reserved. Source

Walter M.,University Hospitals Jena | Heinze C.,University Hospitals Jena | Steiner T.,University Hospitals Jena | Pilchowski R.,University Hospitals Jena | And 3 more authors.
Archives of Physiology and Biochemistry | Year: 2010

Context: Systemic treatment of metastatic renal cell carcinoma (mRCC) with targeted therapies became widely accepted; however, there are few patients who greatly benefit from immunochemotherapy (ICT). It is crucial to recognize these patients for individual treatment. Objectives: Definition of protein patterns in tissue and serum from mRCC-patients to predict benefit from ICT. Materials and methods: Twenty-five tissue samples and 59 sera were analysed by surface-enhanced laser desorption/ionization time-of-flight mass spectrometry (SELDI-TOF MS). Protein peaks of interest were identified by 2D-PAGE and peptide mass fingerprinting. Validation was carried out by Western Blot and ELISA. Results: Protein patterns associated with therapy response were determined. Caveolin-1 (CAV-1) and plasminogen activator inhibitor 1 (PAI-1) were identified in tissue; serum amyloid A (SAA) and transthyretin (TTR) were found in serum. Conclusion: Individual prediction of therapy benefit and selecting patients for ICT based on molecular biological profiles appear to be feasible in the future. © 2010 Informa UK, Ltd. Source

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