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Molecular and Cellular Biology, May 1999, p. 3278-3288, Vol. 19, No. 5
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Insulin Receptor Isoform A, a Newly Recognized, High-Affinity Insulin-Like Growth Factor II Receptor in Fetal and Cancer Cells

F. Frasca,1 G. Pandini,1 P. Scalia,1 L. Sciacca,1 R. Mineo,1 A. Costantino,1 I. D. Goldfine,2 A. Belfiore,3 and R. Vigneri1,*

Istituto di Medicina Interna, Malattie Endocrine e del Metabolismo, University of Catania, Ospedale Garibaldi, 95123 Catania,1 and Cattedra di Endocrinologia, University of Catanzaro, Policlinico Mater Domini, Catanzaro,3 Italy, and Division of Diabetes and Endocrine Research, University of California, San Francisco, California 941152

Received 22 September 1998/Returned for modification 25 October 1998/Accepted 25 January 1999

Insulin-like growth factor II (IGF-II) is a peptide growth factor that is homologous to both insulin-like growth factor I (IGF-I) and insulin and plays an important role in embryonic development and carcinogenesis. IGF-II is believed to mediate its cellular signaling via the transmembrane tyrosine kinase type 1 insulin-like growth factor receptor (IGF-I-R), which is also the receptor for IGF-I. Earlier studies with both cultured cells and transgenic mice, however, have suggested that in the embryo the insulin receptor (IR) may also be a receptor for IGF-II. In most cells and tissues, IR binds IGF-II with relatively low affinity. The IR is expressed in two isoforms (IR-A and IR-B) differing by 12 amino acids due to the alternative splicing of exon 11. In the present study we found that IR-A but not IR-B bound IGF-II with an affinity close to that of insulin. Moreover, IGF-II bound to IR-A with an affinity equal to that of IGF-II binding to the IGF-I-R. Activation of IR-A by insulin led primarily to metabolic effects, whereas activation of IR-A by IGF-II led primarily to mitogenic effects. These differences in the biological effects of IR-A when activated by either IGF-II or insulin were associated with differential recruitment and activation of intracellular substrates. IR-A was preferentially expressed in fetal cells such as fetal fibroblasts, muscle, liver and kidney and had a relatively increased proportion of isoform A. IR-A expression was also increased in several tumors including those of the breast and colon. These data indicate, therefore, that there are two receptors for IGF-II, both IGF-I-R and IR-A. Further, they suggest that interaction of IGF-II with IR-A may play a role both in fetal growth and cancer biology.


* Corresponding author. Mailing address: Cattedra di Endocrinologia, Ospedale Garibaldi, 95123 Catania, Italy. Phone: 39-095-32 62 90. Fax: 39-095-715 80 72. E-mail: segmeint{at}mbox.unict.it.


Molecular and Cellular Biology, May 1999, p. 3278-3288, Vol. 19, No. 5
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.



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