Forced expression of heat-shock protein 70 increases the secretion of Hsp70 and provides protection against tumour growth

M. H. Wang, M. E. Grossmann, C. Y.F. Young

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Although heat-shock protein 70 (Hsp70) has been considered an intracellular protein, we report that Hsp70 is secreted under normal cell culture conditions by human prostate cell lines, LAPC-4, PC-3, CWR-22, RWPE-1 and -2, LNCaP, and TRAMP (transgenic adenocarcinoma mouse prostate)-C2, We found that the secretion can be enhanced by transfection with cDNA encoding for Hsp70. To verify that the Hsp70 detected in the supernatant was not secondary to cell leakage, C2 cells were cotransfected with cytoplasmic Renilla luciferase as a reporter. High levels of activities were noted in the cell extracts, while no enzyme activities were detected in the supematants. To verify that forced oversecretion of Hsp70 could protect against tumour growth, mice were injected with C2 cells transfected with an Hsp70 DNA construct and challenged with live tumour cells. Mice injected with cells transfected with the Hsp70 DNA construct demonstrated a significantly decreased rate of tumour growth compared to those injected with empty vector. In addition, a difference in survival rate as defined by a surrogate end point was noted between the two groups. In a second experiment, we developed a cell line that stably overexpressed Hsp70. Mice injected with these cells also demonstrated a significant decrease in tumour growth and significantly increased survival.

Original languageEnglish (US)
Pages (from-to)926-931
Number of pages6
JournalBritish Journal of Cancer
Volume90
Issue number4
DOIs
StatePublished - Feb 23 2004

Bibliographical note

Funding Information:
This work was funded by Department of Defense grants DAMD17-01-1-0074 and DAMD17-98-18523.

Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.

Keywords

  • Gene therapy
  • Heat-shock protein 70
  • Prostate cancer
  • Secretion
  • Transgenic adenocarcinoma mouse prostate

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