Eto M, Harada M, Tatsugami K, Harano M, Koga H, Matsuzaki G, Naito S. Anti-tumour activity of heat-shock protein 60-recognizing CD4+ T cells against syngeneic murine renal cell carcinoma.
BJU Int 2005;
95:421-4. [PMID:
15679807 DOI:
10.1111/j.1464-410x.2005.05313.x]
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Abstract
OBJECTIVES
To determine whether heat-shock protein (HSP) 60-recognizing CD4(+) T cells show antitumour activity against renal carcinoma (RENCA) cells, as HSP is highly expressed by tumour cells and induced in cells by various stresses, including transformation.
MATERIALS AND METHODS
RENCA, a renal cortical adenocarcinoma cell line of BALB/c origin, was used. Expression of major histocompatibility complex (MHC) class I, class II and HSP-60 on RENCA tumour cells was analysed by flow cytometry. BASL1.1, an autoreactive T-helper type 1 type CD4(+) T cell clone established by us, and that recognises HSP-60, was also used for a tumour-neutralising assay.
RESULTS
The RENCA cells were negative for MHC class II, but expressed intracellular HSP-60. In the tumour-neutralising assay, BASL1.1 cells significantly suppressed the in vivo growth of RENCA cells. Three of five mice rejected RENCA cells when co-inoculated with BASL1.1 cells.
CONCLUSIONS
These results indicate that HSP-60-recognizing CD4(+) T cells have the potential to eliminate renal cell carcinoma in vivo and that the eliciting of an anti-self T cell response at the tumour site can lead to regression of renal cancer.
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