Quantitative analysis of 2,3,7,8-tetrachlorodibenzo-p-dioxin-induced proteome alterations in 5L rat hepatoma cells using isotope-coded protein labels

• Published in: Proteomics (Weinheim) 2006-04, Vol.6 (8), p.2407-2421
• Main Authors: Sarioglu, Hakan, Brandner, Stefanie, Jacobsen, Carola, Meindl, Thomas, Schmidt, Alexander, Kellermann, Josef, Lottspeich, Friedrich, Andrae, Ulrich
• Format: Article
• Language: English
• Subjects: 2,3,7,8‐tetrachlorodibenzo‐p‐dioxin; 5L rat hepatoma cells; 8-tetrachlorodibenzo-p-dioxin; Analytical, structural and metabolic biochemistry; Animals; Apoptosis; Biological and medical sciences; Carcinoma, Hepatocellular - metabolism; Cell Cycle; Cell Line, Tumor; Cytochrome P-450 CYP1A1 - pharmacology; Down-Regulation; Environmental Pollutants; Fundamental and applied biological sciences. Psychology; Gastroenterology. Liver. Pancreas. Abdomen; Isotope-coded protein label; Liver Neoplasms - metabolism; Liver. Biliary tract. Portal circulation. Exocrine pancreas; Mass Spectrometry; Medical sciences; Miscellaneous; Peptides - chemistry; Polychlorinated Dibenzodioxins - chemistry; Proteins; Proteome analysis; Proteomics - methods; Rats; RNA, Messenger - metabolism; Tumors; Up-Regulation
• ISSN: 1615-9853; 1615-9861
• DOI: 10.1002/pmic.200500680

In an effort to contribute to a better understanding of the hepatic toxicity of the ubiquitous environmental pollutant and hepatocarcinogen 2,3,7,8‐tetrachlorodibenzo‐p‐dioxin (TCDD), a comprehensive quantitative proteome analysis was performed on 5L rat hepatoma cells exposed to 1 nM TCDD for 8 h. Changes in the abundances of individual protein species in TCDD‐treated cells as compared to untreated cells were analysed using the nongel‐based isotope‐coded protein label (ICPL) method [Schmidt, A., Kellermann, J., Lottspeich, F., Proteomics 2005, 5, 4–15]. 89 proteins were identified as up‐ or down‐regulated by TCDD. For the majority of the altered proteins, an impact of TCDD on their abundance had not been known before. Due to the physicochemical properties or the translational regulation of a large number of the affected proteins, their alteration would have escaped detection by gel‐based methods for proteome analysis and by standard mRNA expression profiling, respectively. The identified proteins with TCDD‐altered abundance include several proteins implicated in cell cycle regulation, growth factor signalling and the control of apoptosis. The results thus provide new starting‐points for the investigation of specific aspects of the toxicity and carcinogenicity of dioxin in liver.