Document Detail


Methyl beta-cyclodextrin reduces accumulation of reactive oxygen species and cell death in yeast.
MedLine Citation:
PMID:  19272445     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Stabilized F-actin structures have been shown to be detrimental to both mammalian and yeast cells. In yeast, stabilization of actin caused by addition of jasplakinolide, by point mutations in the act1 gene, or by deletion of certain genes that regulate F-actin leads to cell death with hallmarks of apoptosis. In particular, there is an elevation in the levels of reactive oxygen species, and we have shown the importance of the Ras/cAMP pathway for this effect. Here we show that in yeast cells deleted for end3, which functions to regulate actin organization during endocytosis, treatment of cells with methyl beta-cyclodextrin reduces levels of reactive oxygen species and inhibits cell death progression. Methyl beta-cyclodextrin is widely used to disrupt lipid rafts that contain cholesterol. The mechanism through which the rescue is achieved was investigated and we demonstrate that methyl beta-cyclodextrin reduces accumulation of Ras2 at the plasma membrane in Deltaend3 cells. We use FRAP and live cell imaging to determine the possible mechanism through which methyl beta-cyclodextrin functions to elicit this effect on Ras2 localization. Finally, we demonstrate that addition of methyl beta-cyclodextrin to wild-type cells can act to protect cells from acute oxidative stress caused by addition of hydrogen peroxide.
Authors:
Wei Du; Kathryn R Ayscough
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-03-09
Journal Detail:
Title:  Free radical biology & medicine     Volume:  46     ISSN:  1873-4596     ISO Abbreviation:  Free Radic. Biol. Med.     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-05-04     Completed Date:  2009-12-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8709159     Medline TA:  Free Radic Biol Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1478-87     Citation Subset:  IM    
Affiliation:
Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, UK.
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MeSH Terms
Descriptor/Qualifier:
Actins / genetics,  metabolism
Animals
Apoptosis
Cell Membrane
Cytoprotection
Cytoskeletal Proteins / genetics*,  metabolism
Endocytosis
Ergosterol / metabolism
Fluorescence Recovery After Photobleaching
Hydrogen Peroxide / metabolism
Oxidative Stress
Protein Stability
Protein Transport
Reactive Oxygen Species / metabolism
Saccharomyces cerevisiae / physiology*
Saccharomyces cerevisiae Proteins / genetics*,  metabolism
Sequence Deletion
Signal Transduction
beta-Cyclodextrins / metabolism*
ras Proteins / metabolism
Grant Support
ID/Acronym/Agency:
G117/394//Medical Research Council
Chemical
Reg. No./Substance:
0/Act1 protein, S cerevisiae; 0/Actins; 0/Cytoskeletal Proteins; 0/END3 protein, S cerevisiae; 0/Reactive Oxygen Species; 0/Saccharomyces cerevisiae Proteins; 0/beta-Cyclodextrins; 0/methyl-beta-cyclodextrin; 57-87-4/Ergosterol; 7722-84-1/Hydrogen Peroxide; EC 3.6.5.2/RAS2 protein, S cerevisiae; EC 3.6.5.2/ras Proteins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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