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The 70-kDa microbial heat shock protein (mHSP70) has a profound effect on the immune system, interacting with the CD40 receptor on DC and monocytes to produce cytokines and chemokines. The mHSP70 also induces maturation of dendritic cells (DC) and thus acts as an alternative ligand to CD40L on T cells. In this investigation, we have identified a cytokine-stimulating epitope (peptide 407-426), by activating DC with overlapping synthetic peptides (20-mers) derived from the sequence of mHSP70. This peptide also significantly enhances maturation of DC stimulated by mHSP70 or CD40L. The epitope is located at the base of the peptide-binding groove of HSP70 and has five critical residues. Furthermore, an inhibitory epitope (p457-496) was identified downstream from the peptide-binding groove that inhibits cytokine production and maturation of DC stimulated by HSP70 or CD40L. The p38 MAP kinase phosphorylation is critical in the alternative CD40-HSP70 pathway and is inhibited by p457-496 but enhanced by p407-426.

the journal of immunology/the journal of immunology

Identification of Stimulating and Inhibitory Epitopes within the Heat Shock Protein 70 Molecule That Modulate Cytokine Production and Maturation of Dendritic Cells