C-terminus of heat shock cognate 70 interacting protein increases following stroke and impairs survival against acute oxidative stress.

Abstract:

:The decision to remove or refold oxidized, denatured, or misfolded proteins by heat shock protein 70 and its binding partners is critical to determine cell fate under pathophysiological conditions. Overexpression of the ubiquitin ligase C-terminus of HSC70 interacting protein (CHIP) can compensate for failure of other ubiquitin ligases and enhance protein turnover and survival under chronic neurological stress. The ability of CHIP to alter cell fate after acute neurological injury has not been assessed. Using postmortem human tissue samples, we provide the first evidence that cortical CHIP expression is increased after ischemic stroke. Oxygen glucose deprivation in vitro led to rapid protein oxidation, antioxidant depletion, proteasome dysfunction, and a significant increase in CHIP expression. To determine if CHIP upregulation enhances neural survival, we overexpressed CHIP in vitro and evaluated cell fate 24 h after acute oxidative stress. Surprisingly, CHIP overexpressing cells fared worse against oxidative injury, accumulated more ubiquitinated and oxidized proteins, and experienced decreased proteasome activity. Conversely, using small interfering RNA to decrease CHIP expression in primary neuronal cultures improved survival after oxidative stress, suggesting that increases in CHIP observed after stroke like injuries are likely correlated with diminished survival and may negatively impact the neuroprotective potential of heat shock protein 70.

journal_name

Antioxid Redox Signal

authors

Stankowski JN,Zeiger SL,Cohen EL,DeFranco DB,Cai J,McLaughlin B

doi

10.1089/ars.2010.3300

subject

Has Abstract

pub_date

2011-05-15 00:00:00

pages

1787-801

issue

10

eissn

1523-0864

issn

1557-7716

journal_volume

14

pub_type

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