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. 1987 Nov;6(11):3367–3371. doi: 10.1002/j.1460-2075.1987.tb02658.x

The receptor for insulin-like growth factor II mediates an insulin-like response.

J Hari 1, S B Pierce 1, D O Morgan 1, V Sara 1, M C Smith 1, R A Roth 1
PMCID: PMC553792  PMID: 2828025

Abstract

Insulin-like growth factor II (IGF-II) shares sequence homology and predicted three-dimensional structure with insulin and IGF-I. IGF-II can bind, therefore, to a limited extent with the receptors for these two other hormones, as well as to a distinct receptor for IGF-II. Previous studies have been unable to attribute a particular response of IGF-II through its own receptor. In the present studies, the IGF-II receptor is shown to mediate the stimulation of glycogen synthesis in human hepatoma cells since: (i) IGF-II is found to be capable of stimulating a response at concentrations in which it would primarily interact with its own receptor; (ii) the response to IGF-II was not blocked by monoclonal antibodies which inhibit the responses of cells through the insulin and IGF-I receptors; and (iii) polyclonal antibodies to the IGF-II receptor were found to mimic the ability of IGF-II to stimulate glycogen synthesis. These results indicate that the IGF-II receptor mediates a particular biological response--stimulation of glycogen synthesis in hepatoma cells. Furthermore, a monovalent Fab fragment of the polyclonal antibody to the IGF-II receptor was also shown to stimulate glycogen synthesis in these cells. These data indicate that clustering of the IGF-II receptor is not required to stimulate a biological response.

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Selected References

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