Effect of progerin on the accumulation of oxidized proteins in fibroblasts from Hutchinson Gilford progeria patients.

Abstract

The mutation responsible for Hutchinson Gilford Progeria Syndrome (HGPS) causes abnormal nuclear morphology. Previous studies show that free radicals and reactive oxygen species play major roles in the etiology and/or progression of neurodegenerative diseases and aging. This study compares oxidative stress responses between progeric and normal fibroblasts. Our data revealed higher ROS levels in HGPS cells compared to age-matched controls. In response to oxidative challenge, progeric cells showed increased mRNA levels for mitochondrial superoxide dismutase (SOD) and SOD protein content. However, this did not prevent a drop in the ATP content of progeria fibroblasts. Previous studies have shown that declines in human fibroblast ATP levels interfere with programmed cell death and promote necrotic inflammation. Notably, in our investigations the ATP content of progeria fibroblasts was only approximately 50% of that found in healthy controls. Furthermore, HGPS fibroblast analysis revealed a decrease in total caspase-like proteasome activity and in the levels of two active proteolytic complex subunits (beta(5) and beta(7)). A number of studies indicate that the molecular mechanisms causing accelerated aging in progeric patients also occur in healthy cells of older individuals. Thus, the results of this study may also help explain some of the cellular changes that accompany normal aging.

• Authors: Gabriela Viteri, Youn Wook Chung, Earl R Stadtman
• Journal: Mechanisms of ageing and development (Mech Ageing Dev) Vol. 131 Issue 1 Pg. 2-8 (Jan 2010) ISSN: 1872-6216 [Electronic] Ireland
• PMID: 19958786 (Publication Type: Journal Article, Research Support, N.I.H., Intramural)
• Copyright: Published by Elsevier Ireland Ltd.

Chemical References

• Lamin Type A
• Nuclear Proteins
• Protein Precursors
• RNA, Messenger
• Reactive Oxygen Species
• prelamin A
• Adenosine Triphosphate
• Superoxide Dismutase
• Caspases
• Proteasome Endopeptidase Complex

Topics

• Adenosine Triphosphate (metabolism)
• Case-Control Studies
• Caspases (metabolism)
• Cell Line
• Cellular Senescence
• Fibroblasts (metabolism)
• Gene Expression Regulation, Enzymologic
• Humans
• Lamin Type A
• Mitochondria (metabolism)
• Mutation
• Nuclear Proteins (genetics, metabolism)
• Oxidative Stress
• Progeria (genetics, metabolism)
• Proteasome Endopeptidase Complex (metabolism)
• Protein Carbonylation
• Protein Precursors (genetics, metabolism)
• RNA, Messenger (metabolism)
• Reactive Oxygen Species (metabolism)
• Superoxide Dismutase (genetics)
• Up-Regulation