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Journal Articles Leukemia Year : 2010

Insulin is a potent myeloma cell growth factor through insulin/IGF-1 hybrid receptor activation.

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Abstract

Insulin and insulin growth factor type 1 (IGF-1) and their receptors are closely related molecules, but both factors bind to the receptor of the other one with a weak affinity. No study has presently documented a role of insulin as a myeloma growth factor (MGF) for human multiple myeloma cells (MMCs), whereas many studies have concluded that IGF-1 is a major MGF. IGF-1 receptor (IGF-1R) is aberrantly expressed by MMCs in association with a poor prognosis. In this study we show that insulin receptor (INSR) is increased throughout normal plasma cell differentiation. INSR gene is also expressed by MMCs of 203/206 newly diagnosed patients. Insulin is an MGF as potent as IGF-1 at physiological concentrations and requires the presence of insulin/IGF-1 hybrid receptors, stimulating INSR(+)IGF-1R(+) MMCs, unlike INSR(+)IGF-1R(-) or INSR(-)IGF-1R(-) MMCs. Immunoprecipitation experiments indicate that INSR is linked with IGF-1R in MMCs and that insulin induces both IGF-1R and INSR phosphorylations and vice versa. In conclusion, we demonstrate for the first time that insulin is an MGF as potent as IGF-1 at physiological concentrations and its activity necessitates insulin/IGF-1 hybrid receptor activation. Further therapeutic strategies targeting the IGF/IGF-1R pathway have to take into account neutralizing the IGF-1R-mediated insulin MGF activity.
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Origin : Files produced by the author(s)
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Dates and versions

inserm-00528166 , version 1 (19-03-2011)

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Anne Catherine Sprynski, Dirk Hose, Alboukadel Kassambara, Laure Vincent, Michel Jourdan, et al.. Insulin is a potent myeloma cell growth factor through insulin/IGF-1 hybrid receptor activation.. Leukemia, 2010, 24 (11), pp.1940-50. ⟨10.1038/leu.2010.192⟩. ⟨inserm-00528166⟩
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