1. ¹Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, 138 Sheng Li Road, Tainan 740, Taiwan, Republic of China
2. ²Department of Pediatics, College of Medicine, National Cheng Kung University, 138 Sheng Li Road, Tainan 740, Taiwan, Republic of China

Correspondence: B-C Yang, E-mail: y1357@mail.ncku.edu.tw

Received 15 January 2002; Revised 29 April 2002; Accepted 3 May 2002.

Abstract

The survival of tumour cells in a new tissue environment is crucial for tumour metastasis. Factors contributing to the death of tumour cells during metastasis are not completely understood. In murine melanoma model, activation of Fas (CD95, APO-1) signal in tumour cells reduces their lung metastasis potential, which may be associated with an induction of apoptosis in tumours. To elucidate the cellular mechanism, we used a Fas-ligand (Fas-L) specific ribozyme (Fas-L^ribozyme) to suppress the expression of Fas-L but not Fas or TNF- in B16F10 melanoma cells. The Fas-L^ribozyme-carrying cells grew slightly faster in vitro with better viability than controls. Suppression of Fas-L in B16F10 melanoma cells by Fas-L^ribozyme enhanced lung metastasis of the cells in C57BL/6 mice, and that was correlated with reductions in both apoptotic tumour cells and granulocytic infiltration. Mice depleted of granulocytes, but not CD4⁺ and CD8⁺ cells, showed a greatly elevated susceptibility to lung metastasis. Moreover, apoptosis in tumour cells was significantly reduced in granulocyte-depleted mice during the course of tumour formation. Taken together, our findings indicate that Fas-L-associated apoptosis in tumour cells determines the metastasis behaviour of melanoma in the lung and this apoptosis is primarily mediated by the cytotoxicity of recruited granulocytes.