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The DOI matches its Crossref record; 2 of the 2 references it cites were found in a registry or an index.

Insulin Signalling and Insulin Actions in the Muscles and Livers of Insulin-Resistant, Insulin Receptor Substrate 1-Deficient Mice

Open access
Yamauchi, Toshimasa, Tobe, Kazuyuki, Tamemoto, Hiroyuki, Ueki, Kohjiro, Kaburagi, Yasushi, Yamamoto-Honda, Ritsuko, Takahashi, Yoshihiko, Yoshizawa, Fumiaki, Aizawa, Shinichi, Akanuma, Yasuo, Sonenberg, Nahum, Yazaki, Yoshio, Kadowaki, Takashi·1996·Molecular and Cellular Biology

Abstract

We and others recently generated mice with a targeted disruption of the insulin receptor substrate 1 (IRS-1) gene and demonstrated that they exhibited growth retardation and had resistance to the glucose-lowering effect of insulin. Insulin initiates its biological effects by activating at least two major signalling pathways, one involving phosphatidylinositol 3-kinase (PI3-kinase) and the other involving a ras/mitogen-activated protein kinase (MAP kinase) cascade. In this study, we investigated the roles of IRS-1 and IRS-2 in the biological action in the physiological target organs of insulin by comparing the effects of insulin in wild-type and IRS-1-deficient mice. In muscles from IRS-1-deficient mice, the responses to insulin-induced PI3-kinase activation, glucose transport, p70 S6 kinase and MAP kinase activation, mRNA translation, and protein synthesis were significantly impaired compared with those in wild-type mice. Insulin-induced protein synthesis was both wortmannin sensitive and insensitive in wild-type and IRS-1 deficient mice. However, in another target organ, the liver, the responses to insulin-induced PI3-kinase and MAP kinase activation were not significantly reduced. The amount of tyrosine-phosphorylated IRS-2 (in IRS-1-deficient mice) was roughly equal to that of IRS-1 (in wild-type mice) in the liver, whereas it only 20 to 30% of that of IRS-1 in the muscles. In conclusion, (i) IRS-1 plays central roles in two major biological actions of insulin in muscles, glucose transport and protein synthesis; (ii) the insulin resistance of IRS-1-deficient mice is mainly due to resistance in the muscles; and (iii) the degree of compensation for IRS-1 deficiency appears to be correlated with the amount of tyrosine-phosphorylated IRS-2 (in IRS-1-deficient mice) relative to that of IRS-1 (in wild-type mice).

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Metadata

Authors
Yamauchi, T., Tobe, K., Tamemoto, H., Ueki, K., Kaburagi, Y., Yamamoto-Honda, R., Takahashi, Y., Yoshizawa, F., Aizawa, S., Akanuma, Y., Sonenberg, N., Yazaki, Y., & Kadowaki, T.
Venue
Molecular and Cellular Biology
Published
1996-06
Volume
16
Issue
6
Pages
3074-3084
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2108544809
Cited by
288
References
2
FWCI
5.57
Type
journal article
Language
en
Open access
green

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