OBJECTIVES: Newly discovered glutathione transferase omega 1 (GSTO1-1) plays an important role in the glutathionylation cycle, a significant mechanism of protein function regulation. GSTO1-1 expression pattern has not been studied in transitional cell carcinoma (TCC), as yet. METHODS: A total of 56 TCC tumor and corresponding non-tumor specimens were investigated. Glutathione content and thioltransferase activity were measured spectrophotometrically. Protein-glutathione mixed disulfides were measured fluorimetrically. GSTO1-1 expression was determined by immunoblot and qPCR. Immunoprecipitation with GSTO1-1 antibody was followed by immunoblot using anti-GSTO1, GSTP1, c-Jun, JNK, Akt, phospho-Akt, and ASK1 antibody, while for the total S-glutathionylation levels non-reducing electrophoresis was performed. RESULTS: The contents of reduced glutathione and thioltransferase activity were significantly increased in tumor compared to non-tumor tissue. The increased GSTO1 expression in tumor tissue showed clear correlation with grade and stage. However, decreased total protein glutathionylation level in tumor compared to non-tumor samples was found. Immunoprecipitation has shown an association of GSTO1-1 with GSTP1, Akt, phospho-Akt, and ASK1 proteins. CONCLUSIONS: GSTO1 deglutathionylase activity suggests its potential important role in redox perturbations present in TCC. Increased GSTO1-1 expression might contribute to TCC development and/or progression supporting the notion that GSTO1-1 may be a promising novel cancer target.
OBJECTIVES: Newly discovered glutathione transferase omega 1 (GSTO1-1) plays an important role in the glutathionylation cycle, a significant mechanism of protein function regulation. GSTO1-1 expression pattern has not been studied in transitional cell carcinoma (TCC), as yet. METHODS: A total of 56 TCC tumor and corresponding non-tumor specimens were investigated. Glutathione content and thioltransferase activity were measured spectrophotometrically. Protein-glutathione mixed disulfides were measured fluorimetrically. GSTO1-1 expression was determined by immunoblot and qPCR. Immunoprecipitation with GSTO1-1 antibody was followed by immunoblot using anti-GSTO1, GSTP1, c-Jun, JNK, Akt, phospho-Akt, and ASK1 antibody, while for the total S-glutathionylation levels non-reducing electrophoresis was performed. RESULTS: The contents of reduced glutathione and thioltransferase activity were significantly increased in tumor compared to non-tumor tissue. The increased GSTO1 expression in tumor tissue showed clear correlation with grade and stage. However, decreased total protein glutathionylation level in tumor compared to non-tumor samples was found. Immunoprecipitation has shown an association of GSTO1-1 with GSTP1, Akt, phospho-Akt, and ASK1 proteins. CONCLUSIONS:GSTO1 deglutathionylase activity suggests its potential important role in redox perturbations present in TCC. Increased GSTO1-1 expression might contribute to TCC development and/or progression supporting the notion that GSTO1-1 may be a promising novel cancer target.
Authors: T Simic; J Mimic-Oka; A Savic-Radojevic; M Opacic; M Pljesa; D Dragicevic; M Djokic; R Radosavljevic Journal: Urology Date: 2005-05 Impact factor: 2.649
Authors: Marko Babjuk; Maximilian Burger; Richard Zigeuner; Shahrokh F Shariat; Bas W G van Rhijn; Eva Compérat; Richard J Sylvester; Eero Kaasinen; Andreas Böhle; Joan Palou Redorta; Morgan Rouprêt Journal: Eur Urol Date: 2013-06-12 Impact factor: 20.096
Authors: Kenneth D Tew; Yefim Manevich; Christina Grek; Ying Xiong; Joachim Uys; Danyelle M Townsend Journal: Free Radic Biol Med Date: 2011-04-22 Impact factor: 7.376
Authors: Tatjana I Djukic; Ana R Savic-Radojevic; Tatjana D Pekmezovic; Marija G Matic; Marija S Pljesa-Ercegovac; Vesna M Coric; Tanja M Radic; Sonja R Suvakov; Biljana N Krivic; Dejan P Dragicevic; Tatjana P Simic Journal: PLoS One Date: 2013-09-11 Impact factor: 3.240