Abstract：
:Increased sialylation and branching of asparagine-linked oligosaccharides have recently been associated with both neoplastic transformation and the metastatic phenotype. Swainsonine, an inhibitor of Golgi alpha-mannosidase II blocks the synthesis of sialylated tri- and tetraantennary asparagine-linked oligosaccharides and results in the expression of hybrid-type oligosaccharides at the cell surface. Both the lymphoid tumor line MDAY-D2 and B16F10 melanoma cells were less metastatic when grown in swainsonine (0.3 micrograms/ml) for 48 h prior to injection of the cells into the lateral tail veins of mice. The addition of swainsonine (2.5 micrograms/ml) to the drinking water of the mice further reduced the incidence of lung colonization by B16F10 melanoma cells. MDAY-D2 tumors removed from mice on swainsonine-supplemented drinking water showed a loss of leukoagglutinin-binding complex-type oligosaccharides similar to that of tumor cells cultured in medium containing swainsonine. The growth rate of s.c. MDAY-D2 tumors was not reduced by the addition of swainsonine to the drinking water of the host; however, when mice were given two i.p. injections of the interferon-inducing agent polyinosinic:polycytidylic acid in addition to swainsonine, the primary tumor grew at a reduced rate compared to either treatment alone. Swainsonine alone did not inhibit tumor cell growth in vitro; however, the drug enhanced the antiproliferative effect of interferon. The survival time of mice bearing established MDAY-D2 metastases was extended by treating the animals with swainsonine and polyinosinic:polycytidylic acid; however, the number of long-term survival was unchanged. Swainsonine-treated tumor cells appeared to be compromised in two ways: reduced organ colonization potential; and drug-treated MDAY-D2 cells were more sensitive to the antiproliferative effects of interferon in vitro and in vivo.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Dennis JWsubject
Has Abstractpub_date
1986-10-01 00:00:00pages
5131-6issue
10eissn
0008-5472issn
1538-7445journal_volume
46pub_type
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