Molecular characterisation of long-acting insulin analogues in comparison with human insulin, IGF-1 and insulin X10.
| Autor: | Hansen BF; Diabetes Research Unit, Novo Nordisk A/S, Måløv, Denmark. bfh@novonordisk.com, Glendorf T, Hegelund AC, Lundby A, Lützen A, Slaaby R, Stidsen CE |
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| Jazyk: | angličtina |
| Zdroj: | PloS one [PLoS One] 2012; Vol. 7 (5), pp. e34274. Date of Electronic Publication: 2012 May 08. |
| DOI: | 10.1371/journal.pone.0034274 |
| Abstrakt: | Aims/hypothesis: There is controversy with respect to molecular characteristics of insulin analogues. We report a series of experiments forming a comprehensive characterisation of the long acting insulin analogues, glargine and detemir, in comparison with human insulin, IGF-1, and the super-mitogenic insulin, X10. Methods: We measured binding of ligands to membrane-bound and solubilised receptors, receptor activation and mitogenicity in a number of cell types. Results: Detemir and glargine each displayed a balanced affinity for insulin receptor (IR) isoforms A and B. This was also true for X10, whereas IGF-1 had a higher affinity for IR-A than IR-B. X10 and glargine both exhibited a higher relative IGF-1R than IR binding affinity, whereas detemir displayed an IGF-1R:IR binding ratio of ≤ 1. Ligands with high relative IGF-1R affinity also had high affinity for IR/IGF-1R hybrid receptors. In general, the relative binding affinities of the analogues were reflected in their ability to phosphorylate the IR and IGF-1R. Detailed analysis revealed that X10, in contrast to the other ligands, seemed to evoke a preferential phosphorylation of juxtamembrane and kinase domain phosphorylation sites of the IR. Sustained phosphorylation was only observed from the IR after stimulation with X10, and after stimulation with IGF-1 from the IGF-1R. Both X10 and glargine showed an increased mitogenic potency compared to human insulin in cells expressing many IGF-1Rs, whereas only X10 showed increased mitogenicity in cells expressing many IRs. Conclusions: Detailed analysis of receptor binding, activation and in vitro mitogenicity indicated no molecular safety concern with detemir. |
| Databáze: | MEDLINE |
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