The DOI matches its Crossref record; 55 of the 55 references it cites were found in a registry or an index.
Bidirectional modulation of insulin action by amino acids.
Open accessAbstract
Amino acids have been shown to stimulate protein synthesis, inhibit proteolysis, and decrease whole-body and forearm glucose disposal. Using cultured hepatoma and myotube cells, we demonstrate that amino acids act as novel signaling elements in insulin target tissues. Exposure of cells to high physiologic concentrations of amino acids activates intermediates important in the initiation of protein synthesis, including p70 S6 kinase and PHAS-I, in synergy with insulin. This stimulatory effect is largely due to branched chain amino acids, particularly leucine, and can be reproduced by its transamination product, ketoisocaproic acid. Concurrently, amino acids inhibit early steps in insulin action critical for glucose transport and inhibition of gluconeogenesis, including decreased insulin-stimulated tyrosine phosphorylation of IRS-1 and IRS-2, decreased binding of grb 2 and the p85 subunit of phosphatidylinositol 3-kinase to IRS-1 and IRS-2, and a marked inhibition of insulin-stimulated phosphatidylinositol 3-kinase. Taken together, these data support the hypothesis that amino acids act as specific positive signals for maintenance of protein stores, while inhibiting other actions of insulin at multiple levels. This bidirectional modulation of insulin action indicates crosstalk between hormonal and nutritional signals and demonstrates a novel mechanism by which nutritional factors contribute to insulin resistance.
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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
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Gingras, A.-C., Raught, B., & Sonenberg, N. (2001) · Genes & Development · doi:10.1101/gad.887201 · Cited by 1,545
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“Nonetheless, mTORC1/S6K can be stimulated by nutrients independently of IRS [107]—most clearly by branched-chain amino acids (BCAA) such as leucine [108].”
BackgroundA nutrient sensor mechanism controls Drosophila growth
Colombani, J., Raisin, S., Pantalacci, S., Radimerski, T., Montagne, J., & Léopold, P. (2003) · Cell · doi:10.1016/s0092-8674(03)00713-x · Cited by 809
Metadata
- Authors
- Patti, M. E., Brambilla, E., Luzi, L., Landaker, E. J., & Kahn, C. R.
- Venue
- Journal of Clinical Investigation
- Published
- 1998-04-01
- Volume
- 101
- Issue
- 7
- Pages
- 1519-1529
- ISSN
- 0021-9738 (ISSN-L)
- OpenAlex
- W2062801148
- Cited by
- 493
- References
- 55
- FWCI
- 9.23
- Type
- journal article
- Language
- en
- Open access
- green
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