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Interaction of Janus Kinases JAK-1 and JAK-2 with the Insulin Receptor and the Insulin-Like Growth Factor-1 Receptor¹

Institut National de la Santé et de la Recherche Médicale U 145, Faculté de Médecine, 06107 Nice Cédex 2, France

Address all correspondence and requests for reprints to: Emmanuel Van Obberghen, Institut National de la Santé et de la Recherche Médicale U 145, Faculté de Médecine, Avenue de Valombrose, 06107 Nice Cédex 2, France. E-mail: vanobberg{at}unice.fr

Insulin and insulin-like growth factor-1 (IGF-1) treatment of cells overexpressing the insulin receptor or the IGF-1 receptor promotes phosphorylation and activation of Janus kinases JAK-1 and JAK-2 but not of TYK-2. With insulin, we observed maximal phosphorylation of JAK-1 within 2 min (5.2 ± 0.6-fold) and maximal phosphorylation of JAK-2 within 10 min (2.4 ± 0.6-fold). In cells incubated with IGF-1, we found maximal phosphorylation of JAK-2 within 2 min (1.9 ± 0.2-fold) and of JAK-1 within 5 min (4.5 ± 0.4-fold). The JAKs from insulin- or IGF-1-stimulated cells were activated, as shown by their autophosphorylation in vitro. Moreover, they were able to phosphorylate in vitro native insulin receptor substrate (IRS)-1 and a fragment of IRS-2 (GST-IRS-2591–786). Comparison of ³²P-peptide maps of IRS-1 phosphorylated in vitro by the insulin receptor vs. JAK-1 showed the occurrence of different phosphopeptides, suggesting that different sites are likely to be phosphorylated by the two kinases. Finally, coprecipitation of receptors and JAK-1 was seen, and phosphorylation of both receptors was found to be necessary for receptor binding to JAK-1. Two domains of JAK-1 are involved in the formation of the complex between receptor and JAK-1, i.e. the N-terminal portion containing JH7 and JH6 domains, and the C-terminal kinase domain (JH1 domain).

Taking our data together, we conclude that: 1) insulin and IGF-1 lead to phosphorylation and activation of JAK-1 and JAK-2 in intact cells; 2) phosphorylation of IRS-I by JAK-1 seems to occur on sites different from those phosphorylated by the insulin receptor; 3) JAK-1 interacts directly with phosphorylated insulin and IGF-1 receptors; and 4) the JH7-JH6 and JH1 domains of JAK-1 are responsible for the interaction with insulin and IGF-1 receptors.

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