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Circulating HSP70 as an Endogenous Cytoprotector?

  • Alan Graham PockleyEmail author
  • Gabriele Multhoff
Chapter
Part of the Heat Shock Proteins book series (HESP, volume 5)

Abstracts

Although classically regarded as being an intracellular molecular chaperone, many studies have reported that the 70 kDa stress protein can be released from a number of different cell types in the absence of cell death. Furthermore, we and others have reported the presence of Hsp70 in the circulation of normal individuals, and levels of this protein in the peripheral circulation can be increased by a number of physical and psychological stressors. The question is: what is the physiological role of circulating Hsp70? Extracellular Hsp70 has been reported to have a number of neuroprotective and cytoprotective properties, and we have shown that high serum levels of Hsp70 protect individuals with hypertension from the development and progression of cardiovascular disease. It might therefore be that extracellular members of the 70 kDa stress protein family have multiple roles in the maintenance of physiological homeostasis which extend beyond their more commonly accepted properties as immunoregulatory molecules. Perhaps this ubiquitous family of stress proteins could also be considered as exogenous cytoprotectors.

Keywords

Cardiovascular disease cytoprotection Hsp70 peripheral circulation release mechanisms 

Abbreviations

Hsp70

seventy kilo-dalton heat shock protein

HUVECs

human umbilical vein endothelial cells

IL-6

interleukin-6

TLR

toll like receptor

TNF-α

tumour necrosis factor-α

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Immunobiology Research Group, K Floor, The Medical SchoolUniversity of SheffieldSheffieldUK
  2. 2.Department of Radiotherapy and Radiooncology, Klinikum rechts der IsarTechnische Universität MünchenMunichGermany
  3. 3.Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH)Clinical Cooperation Group ‘Innate Immunity in Tumor Biology’MunichGermany

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