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Kolling Institute of Medical Research, University of Sydney and Royal North Shore Hospital, St. Leonards, NSW 2065, Australia
The insulin-like growth factor-II/mannose-6 phosphate receptor (IGF-II/M6PR) is believed to bind and degrade the potent mitogen IGF-II, a growth factor for many tumors. This receptor has been shown to be mutated and/or lost in a significant percentage of a variety of tumors, implying that it may act as a negative regulator of cell growth. In this study, we demonstrate that down-regulation of this receptor, mediated by antisense IGF-II/M6PR cDNA transfection into JEG-3 choriocarcinoma cells, results in increased growth rate in vitro and increased tumor growth rate in vivo. These findings demonstrate that a decrease in IGF-II/M6PR expression results in a growth advantage in JEG-3 cells and are consistent with the hypothesis that the IGF-II/M6PR is an inhibitor of tumor growth.
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