ISSN:
1573-7276
Keywords:
metastasis
;
MHC class I genes
;
TIMP-1
;
VLA-4
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract The effect of MHC class I gene transfection on the metastatic properties of B16BL6 melanoma cells was investigated. BL6-8 melanoma cells transfected with H-2K or H-2K, but not H-2D or H-2L, genes showed a dramatic reduction in their ability to generate experimental metastases in immunosuppressed CB6F1 mice. This observation suggested that some changes in the metastatic phenotype may have been induced in the H-2K- transfected melanoma cells. Analyses of adhesive and invasive properties of BL6-8 melanoma cells transfected with H-2 class I genes have been performed. We found that the loss of metastatic properties in the H-2K or H-2K gene-transfected melanoma cells was associated with reduced adherence to endothe-lial cells, laminin and collagen IV, decreased ability to form homotypic cell aggregates and with a complete loss of VLA-4 integrin expression. In addition, BL6-8 melanoma cells transfected with H-2K genes demon-strated reduced ability to invade Matrigel that paralleled up -regulation of TIMP-1 expression. Incubation of untransfected BL6-8 clone or B16F1 cells with 5-azacytidine similarly resulted in up-regulation of TIMP-1, suggesting that the changes in methylation of TIMP-1 gene could be responsible for TIMP-1 expression in the H-2K-transfected BL6-8 melanoma cells. Transfection of BL6-8 cells with the H-2D d /L d genes did not affect their adhesive and invasive properties. Previously we reported that reduction in the metastatic properties of the H-2K b transfected cells was associated with alterations in cell surface carbohydrates with appearance of a-galactosyl epitopes and reduction in cell surface sialylation. The present data indicate that, in addition to changes in cell surface carbohydrates, reduction in adhesive properties and up-regulation of TIMP-1 may be responsible for the observed loss of metastatic potential of BL6-8 cells transfected with the H-2K genes. © Rapid Science Ltd.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1006569631330
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