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• W2056578843 abstract "Both spatiotemporal analyses of adhesion signalling and the development of pharmacological inhibitors of integrin receptors currently suffer from the lack of an assay to measure integrin-effector binding and the response of these interactions to antagonists. Indeed, anti-integrin compounds have failed in the clinic because of secondary side effects resulting from agonistic activity. Here, we have expressed integrin-GFP and effector-mRFP pairs in living cells and quantified their association using fluorescence lifetime imaging microscopy (FLIM) to measure fluorescence resonance energy transfer (FRET). Association of talin with β1 integrin and paxillin with α4 integrin was dependent on both the ligand and receptor activation state, and was sensitive to inhibition with small molecule RGD and LDV mimetics, respectively. An adaptation of the assay revealed the agonistic activity of these small molecules, thus demonstrating that these compounds may induce secondary effects in vivo via integrin activation. This study provides insight into the dependence of the activity of small molecule anti-integrin compounds upon receptor conformation, and provides a novel quantitative assay for the validation of potential integrin antagonists." @default.
• W2056578843 created "2016-06-24" @default.
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• W2056578843 date "2008-02-01" @default.
• W2056578843 modified "2023-10-16" @default.
• W2056578843 title "Quantification of integrin receptor agonism by fluorescence lifetime imaging" @default.
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• W2056578843 doi "https://doi.org/10.1242/jcs.018440" @default.
• W2056578843 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3328206" @default.
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