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[Expression of Fas and Fas-L in renal cell carcinoma]
Introduction:
The previous investigations revealed that Fas-L expression on tumor cells can be one of the reasons of tumor growth, or tumor regression, with or without activation of the immune response.
Objective:
The objective of our study was to investigate the expression of Fas and Fas-L in situ in normal human renal tissue as well as in different types of renal cell carcinoma (RCC) according to tumor grading.
Method:
Expression of Fas and Fas-L was examined in 25 RCCs classified according to nuclear grades: G1-G3 and to cell type: 17 clear cells, 3 chromophilics (2 eosinophilics, 1 basophilic), 2 chromophobes and 3 spindle cells. Ten normal human kidneys were analyzed, too. Indirect immunoperoxidase technique was applied. Spread and intensity of staining of Fas and Fas-L molecules expression were scored semiquantitatively.
Results:
Distribution of Fas expression in these RCC was typically diffuse. However, Fas-L was almost completely absent in clear cell RCC. In 3 clear cell RCC, some tumor stromal cells exhibited strong expression of Fas-L. On the contrary, chromophilic, chromophobe and spindle cell RCCs grading from G2-G3, manifested variable combinations of Fas and Fas-L expression.
Conclusion:
The most of clear cell type low grade RCCs manifested intensive and extensive expression of Fas and completely absence of Fas-L. However, RCCs of high grade malignancy belonging to the clear cell, eosinophilic, chromophobe or spindle cell types can have various combinations of Fas and Fas-L expression. It may probably lead to development of different mechanisms of avoidance of immune response to RCC.
