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  • Title: Differential endothelial CAM-expression after stimulation with supernatants of LPS- and cytokine-stimulated HT-29 and ST-ML-12 tumor cells growing as monolayer cultures and multicellular spheroids.
    Author: Simiantonaki N, Jayasinghe C, Kirkpatrick CJ.
    Journal: Anticancer Res; 2002; 22(5):2641-9. PubMed ID: 12529976.
    Abstract:
    The mechanisms of tumor metastasis in vitro have been principally investigated using monolayer culture systems. In vivo, however, multicellular clusters of tumor cells rather than individual cells appear to penetrate the microvasculature. Thus, the multicellular tumor spheroid model represents a more suitable tool to study tumor cell-endothelial interactions. Our interest has centered on the role of inflammation on tumor intra- and extravasation. The expression of three endothelial cell adhesion molecules (CAM), ICAM-1, VCAM-1 and E-selectin, on HUVEC after incubation with supernatants of previously LPS-, TNF-alpha- or IL-1 beta-stimulated HT-29 (colon adenocarcinoma) and ST-ML-12 (melanoma) tumor cells growing as monolayers and spheroids, was compared using cell enzyme immunoassay. The results indicated that important differences in the expression of CAM between monolayers and spheroids exist depending on the tumor cell line. The possible significance of LPS for colon carcinomas was underlined by the spheroid-model results. With respect to the influence of intestinal bacteria on the behaviour of colon carcinomas, the spheroid model could be a useful in vitro system for a more realistic simulation of in vivo conditions.
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