The Autoantigenic Proinsulin B-Chain Peptide B11-23 Synergises with the 70 kDa Heat Shock Protein DnaK in Macrophage Stimulation

Author:

Blasius Elias1,Gülden Elke1,Kolb Hubert12,Habich Christiane1,Burkart Volker13ORCID

Affiliation:

1. Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, D-40225 Düsseldorf, Germany

2. West German Center of Diabetes and Health, Düsseldorf Catholic Hospital Group, D-40591 Düsseldorf, Germany

3. German Center for Diabetes Research (DZD), D-85764 München-Neuherberg, Germany

Abstract

Background. Heat shock proteins (Hsp) act as intracellular chaperones and in addition are used as adjuvant in vaccines of peptides complexed with recombinant Hsp. By interacting with autologous peptides, Hsp may promote the induction of autoimmune reactivity. Objective. Here, we analysed whether the effect of Hsp on macrophages is modulated by insulin peptides known to interact with Hsp. Results. Combinations of the 70 kDa Hsp DnaK with peptide B11-23 from the core region of the proinsulin B-chain induced the release of the inflammatory mediators interleukin-6, tumor necrosis factor α, and interleukin-1β from cells of human and murine macrophage lines. In parallel, there was high-affinity binding of B11-23 to DnaK. DnaK mixed with peptides from other regions of the insulin molecule did not stimulate cytokine secretion. DnaK alone induced little cytokine production, and peptides alone induced none. Conclusion. The macrophage-stimulating potential of Hsp70 family proteins when combined with the proinsulin B-chain peptide B11-23 may contribute to the immunodominance of this peptide in the development of beta cell-directed autoimmunity in type 1 diabetes.

Funder

Federal Ministry for Research

Publisher

Hindawi Limited

Subject

Endocrinology,Endocrinology, Diabetes and Metabolism

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