1. Temporal Coding of Insulin Action through Multiplexing of the AKT Pathway
- Author
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Rei Noguchi, Shinsuke Uda, Kanako Watanabe, Yu Toyoshima, Hiroyuki Kubota, Shinya Kuroda, Wataru Ogawa, and Yu Ichi Ozaki
- Subjects
Male ,Cell signaling ,P70-S6 Kinase 1 ,Biology ,Article ,Glycogen Synthase Kinase 3 ,GSK-3 ,Animals ,Insulin ,Phosphorylation ,GSK3B ,Molecular Biology ,Cells, Cultured ,PI3K/AKT/mTOR pathway ,Glycogen Synthase Kinase 3 beta ,Kinase ,Ribosomal Protein S6 Kinases ,Cell Biology ,Rats ,Cell biology ,Kinetics ,Biochemistry ,Glucose-6-Phosphatase ,Signal transduction ,Proto-Oncogene Proteins c-akt ,Signal Transduction - Abstract
One of the unique characteristics of cellular signaling pathways is that a common signaling pathway can selectively regulate multiple cellular functions of a hormone; however, this selective downstream control through a common signaling pathway is poorly understood. Here we show that the insulin-dependent AKT pathway uses temporal patterns multiplexing for selective regulation of downstream molecules. Pulse and sustained insulin stimulations were simultaneously encoded into transient and sustained AKT phosphorylation, respectively. The downstream molecules, including ribosomal protein S6 kinase (S6K), glucose-6-phosphatase (G6Pase), and glycogen synthase kinase-3β (GSK3β) selectively decoded transient, sustained, and both transient and sustained AKT phosphorylation, respectively. Selective downstream decoding is mediated by the molecules' network structures and kinetics. Our results demonstrate that the AKT pathway can multiplex distinct patterns of blood insulin, such as pulse-like additional and sustained-like basal secretions, and the downstream molecules selectively decode secretion patterns of insulin.
- Published
- 2012
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