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• W4313343502 abstract "Abstract The binding of integrins to cognate ligands is tightly controlled by intracellular signals. Conversely, integrin occupancy generates biochemical signals inside the cell. The present study examined whether concepts of integrin function established by in vitro analysis apply to regulation of receptor function in complex biologic settings in vivo using a mouse model of tumor metastasis. Integrin α4 subunits were truncated at amino acid Gln1014 (A4-1014), preserving the conserved GFFKR motif, and at position Glu1021 (A4-1021). In vitro adhesion assays revealed that cytoplasmic tail truncations did not affect constitutive ligand binding of α4 integrins, while agonist-induced adhesion was abolished by the A4-1014, but not by the A4-1021, mutation. Inducible ligand binding of α4 integrins was dependent on cytoskeletal function, whereas constitutive adhesion was not. In vivo metastasis formation assays demonstrated that expansion of murine T lymphoma cells in spleen is strongly inhibited by the wild-type α4 subunit and the A4-1021 mutant. In contrast, the in vivo phenotype of α4 integrin expression in lymphoma cells was completely abrogated by the A4-1014 mutation. Cross-linking of α4 integrins in vitro inhibited proliferation and induced apoptosis of LB cells expressing wild-type α4 subunits or the A4-1021 mutant, but not of LB-A4-1014 cells. In summary, these results demonstrate that sequence motifs regulating cytoskeleton-dependent α4 integrin activation in vitro are essential for the control of LB lymphoma cell expansion both in vitro and in vivo." @default.
• W4313343502 created "2023-01-06" @default.
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• W4313343502 date "1998-12-01" @default.
• W4313343502 modified "2023-10-16" @default.
• W4313343502 title "Sequence Motifs in the Integrin α4 Cytoplasmic Tail Required for Regulation of In Vivo Expansion of Murine Lymphoma Cells" @default.
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• W4313343502 doi "https://doi.org/10.4049/jimmunol.161.11.5978" @default.
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