Tryparedoxin peroxidases and superoxide dismutases expression as well as ROS release are related to Trypanosoma cruzi epimastigotes growth phases

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• 作者：Eduardo F. Peloso^a ; ^{eduardofpeloso@yahoo.com.br} ; Conrado C. Gonç ; alves^a ; Thiago M. Silva^a ; Luis Henrique G. Ribeiro^a ; Marí ; a Dolores Piñ ; eyro^b ; Carlos Robello^b ; Fernanda R. Gadelha^a
• 关键词：Trypanosoma cruzi ; Reactive oxygen species ; Growth curve ; Antioxidant defenses
• 刊名：Archives of Biochemistry and Biophysics
• 出版年：2012
• 出版时间：15 April, 2012
• 年：2012
• 卷：520
• 期：2
• 页码：117-122
• 全文大小：396 K

文摘

Trypanosoma cruzi?em>s antioxidant system is unique and relevant to the parasite. In this study, quantitative assays were performed to determine cytosolic and mitochondrial tryparedoxin peroxidases and superoxide dismutases expression (TcCPx, TcMPx, SODB and SODA) in correlation to H₂O₂ release and production. Differences were observed regarding H₂O₂ release and production between strains and along the growth curve. All of the enzymes studied exhibited varied expression as a function of time in culture. Although at lower levels, the Y strain exhibited the same pattern of Tulahuen 2 enzyme expression for all of the proteins studied, except SODA. In the stationary phase, the degree of expression of all of the enzymes in the Y strain returned to similar levels as those detected in the log phase with the exception of TcCPx and SODA. In Tulahuen 2, a higher expression of TcMPx, SODA and SODB was detected in the early stationary phase, and a slight decrease was observed in the late stationary phase for each enzyme, excluding TcMPx, which exhibited a marked decrease, and TcCPx, which increased its level. Because of the significance of ROS in redox signaling, these differences in enzyme expression underscore the importance of these parameters for epimastigote proliferation.