Immunogenicity of 56°C and UVC-treated prostate cancer is associated with release of HSP70 and HMGBI from necrotic cells

Davide Brusa, Elisa Migliore, Stefano Garetto, Mariagrazia Simone, Lina Matera

Research output: Contribution to journalArticlepeer-review

Abstract

BACKGROUND. Prostate hyperthermia and photodynamic therapy can be delivered by a variety of procedures which result in a wide range of temperatures and light energy and cause different kinds of cell death. METHODS. We have addressed the immunogenic effect of heating and UV Cirradiation on the prostate cancer (PCa) cell line LNCaP, by studying the release of Danger Associated Molecule Pattern (DAMP) molecules HSP70 and HMGB1 and the dendritic cell (DC) antigen-presenting efficiency. RESULTS. Intracellular upmodulation and extracellular release of HSP70 were inversely correlated. Mild temperatures (43-47°C) induced an early increase of intracellular HSP70, whereas the highest temperature (56°C) induced its extrusion from the cell. Likewise, UVC caused an immediate migration of HSP70 into the cell medium in the absence of any intracellular modulation. 56°C and UVC also induced a robust release of HMGB1. The release of DAMP molecules was closely associated with post-apoptotic membrane damage, as shown by double Annexin V/propidium iodide staining, whereas b-tubulin, a structural component of cell membranes, was specifically induced by 56°C heating. Tumor uptake strongly impaired the cytokine-driven maturation of DCs and 56°C heating led to a significant recovery of CD°3 and CCR7 DC maturation markers, but did not influence the antigen cross-presentation activity. On the contrary, UVC-treated LNCaP had negligible effects on DC maturation, but increased the cross-priming of tumor specific CTL. CONCLUSIONS. These data may be of use in the design of effective non-surgical PCa ablations that combine tumor destruction with long lasting immunity.

Original languageEnglish
Pages (from-to)1343-1352
Number of pages10
JournalProstate
Volume69
Issue number12
DOIs
Publication statusPublished - Sep 1 2009

Keywords

  • Antigen presentation
  • Cell death
  • Dendritic cells
  • Tumor immunity
  • Vaccination

ASJC Scopus subject areas

  • Urology
  • Oncology

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