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Intracellular Refolding Assay

Intracellular Refolding Assay

Published on: January 24, 2012

Heat shock proteins and immune system.

Min-Fu Tsan¹, Baochong Gao

¹Office of Research Oversight, Department of Veterans Affairs, 50 Irving Street, N.W., Washington, DC 20422, USA. min-fu.tsan2@va.gov

Journal of Leukocyte Biology

|March 12, 2009

Summary

Heat shock proteins (HSPs) act as molecular chaperones binding peptides and other molecules. Their reported immune functions, like antigen presentation and cytokine effects, are attributed to these bound molecules, not the HSPs themselves.

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Area of Science:

Immunology
Molecular Biology
Cell Biology

Background:

Heat shock proteins (HSPs) are implicated in antigen presentation, immune cell activation, and dendritic cell maturation.
HSPs possess peptide-binding domains crucial for molecular chaperone functions.
HSPs can bind both protein and non-protein molecules with exposed hydrophobic residues.

Purpose of the Study:

To investigate the intrinsic functions of HSPs versus the functions mediated by molecules they bind.
To clarify the mechanisms behind reported HSP-mediated antigen presentation and cytokine effects.

Main Methods:

Analysis of HSP structure and binding properties.
Review of literature on HSP functions and contaminants.
Comparison of immune effects of recombinant versus highly purified HSPs.

Main Results:

HSPs bind antigenic peptides and lipid-based Toll-like receptor (TLR) ligands.
Contaminants in recombinant HSPs (e.g., LPS, lipoprotein, flagellin) are responsible for in vitro cytokine effects.
Highly purified HSPs exhibit no significant cytokine effects.

Conclusions:

HSPs function as molecular chaperones binding various molecules.
Reported antigen presentation and cytokine effects are mediated by molecules chaperoned by HSPs, not the HSPs intrinsically.
The intrinsic function of HSPs is molecular chaperoning, with immune effects arising from bound ligands.