Biochemistry (Moscow)

, 76:1003 | Cite as

Influence of placental mannose/N-acetyl glucosamine-binding proteins on the interaction of insulin and insulin-like growth factors with their receptors

  • O. NedićEmail author
  • D. Filimonović
  • Z. Miković
  • R. Masnikosa


Placenta is a source of carbohydrate-binding proteins that function as molecular scavengers, but they could also be involved in interactions that assist in metabolic control. Mannose/N-acetyl-glucosamine (Man/GlcNAc)-binding proteins from placenta were isolated and their reactivity towards placental insulin and insulin-like growth factor receptors (IR and IGF-Rs) was analyzed. The lectins reduced the binding of insulin and IGF-I in a dose-dependent manner, while almost no effect was observed on the binding of IGF-II. The shape of the inhibition curves changed, suggesting altered binding specificity. The presence of sugar could not reverse completely the effect of the lectins, implicating both lectin-sugar and protein-protein conformational recognition. Since biological molecules in our experimental system were those that are in close relation in vivo, placental Man/GlcNAc-specific lectins may be regarded as potential allosteric modulators of lig- and-receptor interactions in a system of homologous ligands, selectively affecting only binding to tyrosine kinase type receptors (IR and IGF-1R).

Key words

insulin insulin-like growth factors receptors lectins placenta 



cation-independent mannose-6-phosphate/IGF-II receptor

Con A

concanavalin A




glycosylated (glycated) hemoglobin


Hepes buffered saline


insulin-dependent diabetes mellitus


insulin-like growth factor


insulin receptor


type 1 IGF receptor


type 2 IGF receptor




mannose-binding lectin


macrophage mannose receptor


phosphate buffered saline


wheat germ agglutinin


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Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • O. Nedić
    • 1
    Email author
  • D. Filimonović
    • 2
  • Z. Miković
    • 2
  • R. Masnikosa
    • 1
  1. 1.Institute for the Application of Nuclear EnergyUniversity of BelgradeBelgradeSerbia
  2. 2.Clinic of Gynecology and Obstetrics Narodni FrontUniversity of BelgradeBelgradeSerbia

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