Secreted heat shock protein gp96-Ig: An innovative vaccine approach

Department of Microbiology and Immunology, Miller School of Medicine, University of Miami, Miami, FL, USA
American Journal Of Reproductive Immunology (Impact Factor: 2.44). 04/2008; 59(5):407 - 416. DOI: 10.1111/j.1600-0897.2008.00594.x


Heat shock proteins (HSPs) are a large family of proteins with different molecular weights and different intracellular localizations. These proteins undertake crucial functions in maintaining cell homeostasis, and therefore they have been conserved during evolution. HSP gp96 also known as glucose-regulated protein grp94, is the primary chaperone of the endoplasmatic reticulum. Gp96/grp94, because of its peptide chaperone capacity and its ability to interact actively with professional antigen-presenting cells (APCs), is also endowed with crucial immunological functions such as natural adjuvant for priming innate and adaptive immunity. To make gp96 accessible to the immune system without biochemical purification and without cell lysis, we generated a secreted form of gp96. The immunological properties of secreted gp96 and its implications for vaccine in human cancer and infectious diseases will be discussed.

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    • "Chaperones take part in the assembly, stabilization, folding, and translocation of oligomeric proteins. The expression of many HSPs is upregulated under stress conditions, nutritional deficiencies, ultraviolet irradiation, chemicals, viral infection, and ischemia-reperfusion injury [33, 34]. Chaperones, like bacterial DnaK and GroEl, have been reported to decrease recombinant protein aggregates and to assist their folding in E. coli host expression systems [35, 36]. "
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