The effect of divalent metal cations on the αv integrin binding site is ligand and integrin specific - 06/01/19
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Highlights |
• | [3H]compound 1 αv integrin binding profiles are unique in relation to divalent metal cation type and concentration. |
• | Physiological concentrations of Mg2+ and Ca2+ alter the αv integrin selectivity profile of [3H]compound 1. |
• | The [3H]compound 1 binding profile differs in terms of affinity and the level of receptor occupancy. |
• | αvβ6 integrin binding of RGD ligands differ under the same divalent metal cation conditions. |
Abstract |
The binding of orthosteric ligands to integrins requires the presence of divalent metal cations bound to metal ion-binding sites located in the I domains of the integrin α and β subunits. In this study the influence of the type and concentration of divalent metal cation present was investigated on a single arginyl-glycinyl-aspartic acid (RGD) ligand across the αv integrin sub-family and single αv integrin (αvβ6) with different ligands. These relationships were determined using radioligand binding studies completed with [3H] ligands and purified αv integrin protein preparations. The binding of [3H]compound 1 to the RGD site on individual αv integrins demonstrated a unique profile in relation to the type and concentration of divalent metal cation present. The use of physiological concentrations of Mg2+ and Ca2+ in simulated lung fluid altered the αv integrin selectivity profile of [3H]compound 1 in terms of affinity and the level of receptor occupancy. In addition, different RGD ligands for the αvβ6 integrin behaved differently under the same divalent metal cation conditions. In conclusion, this study demonstrates the need to determine the individual relationship between RGD ligands and the integrins they may engage in vivo, especially when determining selectivity profiles for potential RGD-mimetic small molecule therapeutics, with organ and disease state also considered.
Le texte complet de cet article est disponible en PDF.Abbreviations : MIDAS, ADIMIDAS, LIMBS, RGD, tLAP, CHAPS, DMSO, NSB, LS, ANOVA, Bmax
Keywords : αv integrins, Divalent metal cations, Radioligand binding, Affinity, Integrin selectivity
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Vol 110
P. 362-370 - février 2019 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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