The soluble proteome of tobacco Bright Yellow-2 cells undergoing H₂O₂-induced programmed cell death.

Abstract:

:Plant programmed cell death (PCD) is a genetically controlled process that plays an important role in development and stress responses. Reactive oxygen species (ROS) are key inducers of PCD. The addition of 50 mM H₂O₂ to tobacco Bright Yellow-2 (TBY-2) cell cultures induces PCD. A comparative proteomic analysis of TBY-2 cells treated with 50 mM H₂O₂ for 30 min and 3 h was performed. The results showed early down-regulation of several elements in the cellular redox hub and inhibition of the protein repair-degradation system. The expression patterns of proteins involved in the homeostatic response, in particular those associated with metabolism, were consistently altered. The changes in abundance of several cytoskeleton proteins confirmed the active role of the cytoskeleton in PCD signalling. Cells undergoing H₂O₂-induced PCD fail to cope with oxidative stress. The antioxidant defence system and the anti-PCD signalling cascades are inhibited. This promotes a genetically programmed cell suicide pathway. Fifteen differentially expressed proteins showed an expression pattern similar to that previously observed in TBY-2 cells undergoing heat shock-induced PCD. The possibility that these proteins are part of a core complex required for PCD induction is discussed.

journal_name

J Exp Bot

authors

Vannini C,Marsoni M,Cantara C,De Pinto MC,Locato V,De Gara L,Bracale M

doi

10.1093/jxb/ers031

subject

Has Abstract

pub_date

2012-05-01 00:00:00

pages

3137-55

issue

8

eissn

0022-0957

issn

1460-2431

pii

ers031

journal_volume

63

pub_type

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