TAILIEUCHUNG - báo cáo khoa hoc : Bcl-2 suppresses hydrogen peroxide-induced programmed cell death via OsVPE2 and OsVPE3, but not via OsVPE1 and OsVPE4, in rice

Hydrogen peroxide (H2O2 ) is known to be a key player in apoptosis in ani-mals. The components and pathways regulating H2O2-induced programmed cell death in plants, however, remain largely unknown. In the present study, rice transgenic lines overexpressing Bcl-2, a human apoptotic sup-pressor, were obtained. | IFEBS Journal Bcl-2 suppresses hydrogen peroxide-induced programmed cell death via OsVPE2 and OsVPE3 but not via OsVPEI and OsVPE4 in rice A It I-S 1 II 1 X z I XZ 1 X z I IX 1iAf I Af 1 1 I 1 1 I I Minjuan Deng Hongwu Bian Yakun Xie Yongho Kim Wenzhe Wang Erpei Lin Zhanghui Zeng1 Fu Guo1 Jianwei Pan2 Ning Han1 Junhui Wang1 Qian Qian3 and Muyuan Zhu1 1 State Key Laboratory of Plant Physiology and Biochemistry Key Laboratory for Celland Gene Engineering of Zhejiang province College of Life Sciences Zhejiang University China 2 College of Chemistry and Life Sciences Zhejiang NormalUniversity China 3 State Key Laboratory of Rice Biology China NationalRice Research Institute Hangzhou Zhejiang China Keywords Bcl-2 hydrogen peroxide programmed cell death rice vacuolar processing enzyme Correspondence M. Zhu H. Bian or N. Han College of Life Sciences Zhejiang University 866 Yuhangtang Road Hangzhou Zhejiang 310058 China Fax 86 571 88206535 Tel 86 571 88206536 E-mail myzhu@ hwbian@ ninghan@ Received 21 March 2011 revised 16 September 2011 accepted 26 September 2011 doi Hydrogen peroxide H2O2 is known to be a key player in apoptosis in animals. The components and pathways regulating H2O2-induced programmed cell death in plants however remain largely unknown. In the present study rice transgenic lines overexpressing Bcl-2 a human apoptotic suppressor were obtained. These transgenic lines showed increased tolerance to high levels of H2O2 resulting in increased seed germination rates root elongation root tip cell viability and chlorophyll retention compared to control lines. In the control lines treatment with H2O2 resulted in DNA laddering and a clear terminal transferase dUTP nick end labeling signal which are the hallmarks of programmed cell death. However this effect was not detected in the Bcl-2-overexpressing transgenic lines. Further investigations indicated that Bcl-2 suppressed H2O2-induced programmed cell

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