Lysosomal rerouting of Hsp70 trafficking as a potential immune activating tool for targeting melanoma

Kata Juhász, Roland Thuenauer, Andrea Spachinger, Erno Duda, Ibolya Horváth, László Vígh, Alois Sonnleitner, Zsolt Balogi

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Tumor specific cell surface localization and release of the stress inducible heat shock protein 70 (Hsp70) stimulate the immune system against cancer cells. A key immune stimulatory function of tumor-derived Hsp70 has been exemplified with the murine melanoma cell model, B16 overexpressing exogenous Hsp70. Despite the therapeutic potential mechanism of Hsp70 transport to the surface and release remained poorly understood. We investigated principles of Hsp70 trafficking in B16 melanoma cells with low and high level of Hsp70. In cells with low level of Hsp70 apparent trafficking of Hsp70 was mediated by endosomes. Excess Hsp70 triggered a series of changes such as a switch of Hsp70 trafficking from endosomes to lysosomes and a concomitant accumulation of Hsp70 in lysosomes. Moreover, lysosomal rerouting resulted in an elevated concentration of surface Hsp70 and enabled active release of Hsp70. In fact, hyperthermia, a clinically applicable approach triggered immediate active lysosomal release of soluble Hsp70 from cells with excess Hsp70. Furthermore, excess Hsp70 enabled targeting of internalized surface Hsp70 to lysosomes, allowing in turn heat-induced secretion of surface Hsp70. Altogether, we show that excess Hsp70 expressed in B16 melanoma cells diverts Hsp70 trafficking from endosomes to lysosomes, thereby supporting its surface localization and lysosomal release. Controlled excess-induced lysosomal rerouting and secretion of Hsp70 is proposed as a promising tool to stimulate anti-tumor immunity targeting melanoma.

Original languageEnglish
Pages (from-to)430-440
Number of pages11
JournalCurrent pharmaceutical design
Volume19
Issue number3
DOIs
Publication statusPublished - 2013

Keywords

  • Hsp70
  • Immunotherapy
  • Lysosome
  • Melanoma
  • Release
  • Transport to surface

ASJC Scopus subject areas

  • Pharmacology
  • Drug Discovery

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