Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Efficacy of targeting bone-specific GIP receptor in ovariectomy-induced bone loss

Abstract :

Glucose-dependent insulinotropic polypeptide (GIP) has been recognized in the last decade as an important contributor of bone remodeling and is necessary for optimal bone quality. However, GIP receptors are expressed in several tissues in the body and little is known about the direct versus indirect effects of GIP on bone remodeling and quality. The aims of the present study were to validate two new GIP analogues, called [D-Ala2]-GIP-Tag and [D-Ala2]-GIP1-30, that specifically target either bone or whole body GIP receptors, respectively; and to ascertain the beneficial effects of GIP therapy on bone in a mouse model of ovariectomy-induced bone loss. Both GIP analogues exhibited similar binding capacities at the GIP receptor and intracellular responses as full-length GIP1-42. Furthermore, only [D-Ala2]-GIP-Tag, but not [D-Ala2]-GIP1-30, was undoubtedly found exclusively in the bone matrix and released at acidic pH. In ovariectomized animals, [D-Ala2]-GIP1-30 but not [D-Ala2]-GIP-Tag ameliorated bone stiffness at the same magnitude than alendronate treatment. Only [D-Ala2]-GIP1-30 treatment led to significant ameliorations in cortical microarchitecture. Although alendronate treatment increased the hardness of the bone matrix and the type B carbonate substitution in the hydroxyapatite crystals, none of the GIP analogues modified bone matrix composition. Interestingly, in ovariectomy-induced bone loss, [D-Ala²]-GIP-Tag failed to alter bone strength, microarchitecture and bone matrix composition. Overall, this study shows that the use of a GIP analogue that target whole body GIP receptors might be useful to improve bone strength in ovariectomized animals.

Type de document :
Article dans une revue
Liste complète des métadonnées

Littérature citée [19 références]  Voir  Masquer  Télécharger

https://hal.univ-angers.fr/hal-02869273
Contributeur : Okina Université d'Angers <>
Soumis le : lundi 15 juin 2020 - 20:40:14
Dernière modification le : mercredi 17 juin 2020 - 03:36:57

Fichier

2018_-_jendocrinol.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Guillaume Mabilleau, Benoit Gobron, Aleksandra Mieczkowska, Rodolphe Perrot, Daniel Chappard. Efficacy of targeting bone-specific GIP receptor in ovariectomy-induced bone loss. Journal of endocrinology , 2018, 239 (2), pp.215-227. ⟨10.1530/JOE-18-0214⟩. ⟨hal-02869273⟩

Partager

Métriques

Consultations de la notice

11

Téléchargements de fichiers

31