The DOI matches its Crossref record; 55 of the 55 references it cites were found in a registry or an index.
Amino Acid and Insulin Signaling via the mTOR/p70 S6 Kinase Pathway
Open accessAbstract
Amino acids have emerged as potent modulators of the mTOR/p70 S6 kinase pathway. The involvement of this pathway in the regulation of insulin-stimulated glucose transport was investigated in the present study. Acute exposure (1 h) to a balanced mixture of amino acids reduced insulin-stimulated glucose transport by as much as 55% in L6 muscle cells. The effect of amino acids was fully prevented by the specific mTOR inhibitor rapamycin. Time course analysis of insulin receptor substrate 1 (IRS-1)-associated phosphatidylinositol (PI) 3-kinase activity revealed that incubation with amino acids speeds up its time-dependent deactivation, leading to a dramatic suppression (-70%) of its activity after 30 min of insulin stimulation as compared with its maximal activation (5 min of stimulation). This accelerated deactivation of PI 3-kinase activity in amino acid-treated cells was associated with a concomitant and sustained increase in the phosphorylation of p70 S6 kinase. In marked contrast, inhibition of mTOR by rapamycin maintained PI 3-kinase maximally activated for up to 30 min. The marked inhibition of insulin-mediated PI 3-kinase activity by amino acids was linked to a rapamycin-sensitive increase in serine/threonine phosphorylation of IRS-1 and a decreased binding of the p85 subunit of PI 3-kinase to IRS-1. Furthermore, amino acids were required for the degradation of IRS-1 during long term insulin treatment. These results identify the mTOR/p70 S6 kinase signaling pathway as a novel modulator of insulin-stimulated glucose transport in skeletal muscle cells.
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Prolonged Rapamycin Treatment Inhibits mTORC2 Assembly and Akt/PKB
Sarbassov, D. D., Ali, S. M., Sengupta, S., Sheen, J.-H., Hsu, P. P., Bagley, A. F., Markhard, A. L., & Sabatini, D. M. (2006) · Molecular Cell · doi:10.1016/j.molcel.2006.03.029 · Cited by 2,365
Absence of S6K1 protects against age- and diet-induced obesity while enhancing insulin sensitivity
Um, S. H., Frigerio, F., Watanabe, M., Picard, F., Joaquin, M., Sticker, M., Fumagalli, S., Allegrini, P. R., Kozma, S. C., Auwerx, J., et al. (2004) · Nature · doi:10.1038/nature02866 · Cited by 1,677
mTOR and cancer: insights into a complex relationship
Sabatini, D. M. (2006) · Nature Reviews Cancer · doi:10.1038/nrc1974 · Cited by 1,322
Rapamycin: one drug, many effects
Li, J., Kim, S. G., & Blenis, J. (2014) · Cell Metabolism · doi:10.1016/j.cmet.2014.01.001 · Cited by 1,287
Metadata
- Authors
- Tremblay, F., & Marette, A.
- Venue
- Journal of Biological Chemistry
- Published
- 2001-10
- Volume
- 276
- Issue
- 41
- Pages
- 38052-38060
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W1518126931
- Cited by
- 542
- References
- 55
- FWCI
- 4.67
- Type
- journal article
- Language
- en
- Open access
- hybrid
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