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Abstract
To study the interaction between insulin receptor (IR) and insulin-like growth factor-I
(IGF-I) receptor (IGF-IR) tyrosine kinases, we examined IGF-I action in Rat-1 cells
expressing a naturally occurring tyrosine kinase-deficient mutant IR (Asp 1048 IR).
IGF-I normally stimulated receptor autophosphorylation, IRS-I phosphorylation, and
glycogen synthesis in cells expressing Asp 1048 IR. However, the Asp 1048 IR inhibited
IGF-I-stimulated thymidine uptake by 45% to 52% and amino acid uptake (aminoisobutyric
acid [AIB]) by 58% in Asp 1048 IR cells. Furthermore, IGF-I-stimulated tyrosine kinase
activity toward synthetic polymers, Shc phosphorylation, and mitogen-activated protein
(MAP) kinase activity was inhibited. The inhibition of mitogenesis and AIB uptake
was restored with the amelioration of the impaired tyrosine kinase activity and Shc
phosphorylation by the introduction of abundant wild-type IGF-IR in Asp 1048 IR cells.
These results suggest that the Asp 1048 IR causes a dominant negative effect on IGF-IR
in transmitting signals to Shc and MAP kinase activation, which leads to decreased
IGF-I-stimulated DNA synthesis, and that the kinase-defective insulin receptor does
not affect IGF-I-stimulated IRS-I phosphorylation, which leads to the normal IGF-I-stimulated
glycogen synthesis.
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Article info
Publication history
Accepted:
June 4,
1996
Received:
October 22,
1995
Footnotes
☆Supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, and Culture, Japan, a Grant-in-Aid for Intractable Diseases from the Ministry of Welfare, Japan, a Grant-in-Aid from Otsuka Pharmaceutical, Japan, and a Grant-in-Aid from the Japan Diabetes Society.
Identification
Copyright
© 1996 Published by Elsevier Inc.