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• W2134255619 abstract "Abstract α4 integrins play a pivotal role in leukocyte migration and tissue-specific homing. The ability of integrins to bind ligand is dynamically regulated by activation-dependent conformational changes triggered in the cytoplasmic domain. An NMR solution structure defined a putative membrane-proximal salt bridge between the αIIbβ3 integrin cytoplasmic tails, which restrains integrins in their low-affinity state. However, the physiological importance of this salt bridge in α4 integrin regulation remains to be elucidated. To address this question, we disrupted the salt bridge in murine germ line by mutating the conserved cytoplasmic arginine RGFFKR in α4 integrins. In lymphocytes from knock-in mice (α4-R/AGFFKR), α4β1 and α4β7 integrins exhibited constitutively up-regulated ligand binding. However, transmigration of these cells across VCAM-1 and MAdCAM-1 substrates, or across endothelial monolayers, was reduced. Perturbed detachment of the tail appeared to cause the reduced cell migration of α4-R/AGFFKR lymphocytes. In vivo, α4-R/AGFFKR cells exhibited increased firm adhesion to Peyer patch venules but reduced homing to the gut. Our results demonstrate that the membrane-proximal salt bridge plays a critical role in supporting proper α4 integrin adhesive dynamics. Loss of this interaction destabilizes the nonadhesive conformation, and thereby perturbs the properly balanced cycles of adhesion and deadhesion required for efficient cell migration." @default.
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• W2134255619 date "2008-12-15" @default.
• W2134255619 modified "2023-10-16" @default.
• W2134255619 title "Genetic perturbation of the putative cytoplasmic membrane-proximal salt bridge aberrantly activates α4 integrins" @default.
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• W2134255619 doi "https://doi.org/10.1182/blood-2008-03-144543" @default.
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