Identification of an upstream regulatory pathway controlling actin-mediated apoptosis in yeast

Gourlay, Campbell W. and Ayscough, R. (2005) Identification of an upstream regulatory pathway controlling actin-mediated apoptosis in yeast. Journal of Cell Science, 118 . pp. 2119-2132. ISSN 0021-9533 . (Access to this publication is restricted)

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Abstract

The build up of reactive oxygen species (ROS) is known to contribute to a reduction in the lifespan of a cell and to their degeneration in diseases such as Alzheimer's and tissue ischaemia. It is therefore important to elucidate pathways that regulate cellular oxidative stress. We have previously shown that actin dynamics can affect the oxidative-stress burden on a yeast cell and thereby its potential lifespan. To elucidate further the connection between actin dynamics and oxidative stress, we sought to identify regulators of this process. The actin regulatory proteins Sla1p and End3p are important in maintaining a rapid turnover of F-actin in cortical patches. We show that cells expressing a mutated form of Sla1p or lacking End3p display markers of apoptosis such as depolarized mitochondrial membranes and elevated levels of reactive oxygen species. Overexpression of the ubiquitin ligase RSP5 can alleviate the oxidative-stress phenotype observed in cells lacking End3p by targeting Sla1p to the cortex and restoring actin remodelling capability. We also demonstrate that overexpression of PDE2, a negative regulator of the Ras/cAMP pathway rescues actin dynamics, reduces oxidative stress sensitivity and restores viability in deltaend3 cells. Our data suggest, for the first time, that a physiological link exists between actin regulation and cAMP signalling that regulates apoptosis in yeast.

Item Type: Article
Uncontrolled keywords: cell death; cAMP; CAP/SRV2; mitochondria; ROS
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences > Cell & Developmental Biology Group
Depositing User: Sue Davies
Date Deposited: 19 Dec 2007 17:46
Last Modified: 09 Aug 2013 08:07
Resource URI: http://kar.kent.ac.uk/id/eprint/28 (The current URI for this page, for reference purposes)
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