Conclusions
The heat shock, or stress response is an ancient, highly conserved, primitive endogenous cellular defense mechanism. Traditionally, stress proteins, e.g. HSP70, have been considered to be exclusively intracellular proteins. However, increasing evidence supports a role for extracellular stress proteins, including HSP70, in the innate and acquired immune response. For example, stress proteins have been reported to stimulate the immune system via innate receptors, such as the TLR. Recent data, however, challenge this notion by claiming that it is the bacterial molecules that are trapped by the stress proteins, and not the stress proteins themselves that activate the immune system. In this brief review, we have presented evidence to suggest that stress proteins are indeed modulators of immune function. Whether activation of the immune response by extracellular stress proteins such as HSP70 serves a cytoprotective function, a pro-inflammatory function, or both, depending on context, remains to be determined.
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Wheeler, D.S., Zingarelli, B., Wong, H.R. (2006). The Role of Extracellular Heat Shock Proteins in Cellular Inflammation and Injury. In: Vincent, JL. (eds) Yearbook of Intensive Care and Emergency Medicine. Yearbook of Intensive Care and Emergency Medicine, vol 2006. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-33396-7_5
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