RESUMEN
A series of (S)-2-(2-(diethylamino)-5-(N-alkyl-N-sulfonamido)pyrimidin-4-ylamino)-3-(4-(carbamoyloxy)phenyl)propanoic acid is discovered as orally available VLA-4 antagonists. Representative compounds 11b and 11p showed efficacy in multiple in vivo animal models. The in vitro selectivity of 11p is also described.
Asunto(s)
Antirreumáticos/farmacología , Integrina alfa4beta1/antagonistas & inhibidores , Pirimidinas/farmacología , Sulfonamidas/farmacología , Animales , Antirreumáticos/administración & dosificación , Antirreumáticos/síntesis química , Artritis Experimental/tratamiento farmacológico , Asma/tratamiento farmacológico , Adhesión Celular/efectos de los fármacos , Colágeno Tipo II/antagonistas & inhibidores , Modelos Animales de Enfermedad , Relación Dosis-Respuesta a Droga , Femenino , Fibronectinas/química , Humanos , Ratones , Ratones Endogámicos C57BL , Modelos Moleculares , Conformación Molecular , Esclerosis Múltiple/tratamiento farmacológico , Pirimidinas/administración & dosificación , Pirimidinas/síntesis química , Ratas , Ratas Endogámicas Lew , Ratas Sprague-Dawley , Relación Estructura-Actividad , Sulfonamidas/administración & dosificación , Sulfonamidas/síntesis químicaRESUMEN
Mitsunobu reactions were employed to link t-butyl esters of α4 integrin inhibitors at each of the termini of a three-arm, 40 kDa, branched PEG. Cleavage of the t-butyl esters using HCO2H provided easily isolated PEG derivatives, which are potent α4 integrin inhibitors, and which achieve sustained levels and bioactivity in vivo, following subcutaneous administration to rats.
Asunto(s)
Integrina alfa4/química , Polietilenglicoles/química , Animales , Anticuerpos Monoclonales/química , Anticuerpos Monoclonales/inmunología , Anticuerpos Monoclonales/farmacocinética , Ésteres , Semivida , Humanos , Inyecciones Subcutáneas , Integrina alfa4/inmunología , Integrina alfa4/metabolismo , Células Jurkat , RatasRESUMEN
Traditionally, cell adhesion assays are performed in a manual workstation format using fluorescence-based readouts. Herein, the authors describe a label-free homogeneous assay to identify inhibitors of α4ß7 integrin-mediated cell adhesion to its ligand, the mucosal addressin cell adhesion molecule (MadCAM), using the SRU BIND platform. The biosensor is optically based and comprises a subwavelength polymer grating. The assay was validated using standard compounds and an α4 blocking antibody and correlated very closely with the manual assay format when running a battery of test compounds of varying potencies. Cell adhesion was strictly dependent on the presence of divalent cations where Mg(2+) was greater than Ca(2+) at promoting cell adhesion. This homogeneous and label-free format exhibited low variability with a calculated Z' of 0.6. In addition to measuring α4ß7-mediated 8866 cell adhesion to MadCAM, the authors also demonstrate that this platform can measure adhesion of Jurkat cells expressing α4ß1 to the vascular cell adhesion molecule. Thus, the SRU BIND platform is widely applicable to measuring cell adhesion events mediated by other integrins binding to their receptors in an assay format that is amenable to high-throughput screening.