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Heat Shock Proteins in the Brain: Role of Hsp70, Hsp 27, and HO-1 (Hsp32) and Their Therapeutic Potential

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Abstract

Heat shock proteins (Hsps) are induced by heat shock via heat shock factor proteins binding to heat shock elements in their promoters. Hsp70 is massively induced in response to misfolded proteins following cerebral ischemia in all cell types but is induced mainly in neurons in the ischemic penumbra. Overexpression of Hsp70 via transgenes and viruses or systemic administration of Hsp70 fusion proteins that allow it to cross the blood brain barrier protects the brain against ischemia in most reported studies. Hsp27 can exist as unphosphorylated large oligomers that prevent misfolded protein aggregates and improve cell survival. P-Hsp27 small oligomers bind specific protein targets to improve survival. In the brain, protein kinase D phosphorylates Hsp27 following ischemia which then binds apoptosis signal-regulating kinase 1 to prevent MKK4/7, c-Jun NH(2)-terminal kinase, and Jun-induced apoptosis, and decrease infarct volumes following focal cerebral ischemia. Heme oxygenase-1 (HO-1) metabolizes heme to carbon monoxide, ferrous ion, and biliverdin. CO activates cGMP to promote vasodilation, and biliverdin is converted to bilirubin which can serve as an anti-oxidant, both of which may contribute to the reported protective role of HO-1 in cerebral ischemia and subarachnoid hemorrhage. However, ferrous ion can react with hydrogen peroxide to produce pro-oxidant hydroxyl radicals which may explain the harmful role of HO-1 in intracerebral hemorrhage. Heat shock proteins as a class have great potential as treatments for cerebrovascular disease and have yet to be tested in the clinic.

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Acknowledgments

This study was supported in part by the National Institutes of Health (NS 066845).

Conflict of Interest

There were no conflicts of interest.

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Authors and Affiliations

  1. Department of Neurology, University of California at Davis, Sacramento, CA, 95817, USA

    Frank R Sharp, Xinhua Zhan & Da-Zhi Liu

  2. MIND Wet Labs, MIND Institute, University of California Medical Center, University of California at Davis, Sacramento, CA, 95817, USA

    Frank R Sharp, Xinhua Zhan & Da-Zhi Liu

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  1. Frank R Sharp
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Correspondence to Da-Zhi Liu.

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Sharp, F.R., Zhan, X. & Liu, DZ. Heat Shock Proteins in the Brain: Role of Hsp70, Hsp 27, and HO-1 (Hsp32) and Their Therapeutic Potential. Transl. Stroke Res. 4, 685–692 (2013). https://doi.org/10.1007/s12975-013-0271-4

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  • DOI: https://doi.org/10.1007/s12975-013-0271-4

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