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• W2090925079 abstract "SUMMARY The Arg-Gly-Asp (RGD) cell adhesion motif has been demonstrated in various studies to play a pivotal rote in leucocyte and platelet interactions with plasma and extracellular matrix (ECM) glycoproteins. The recognition the RGD sequence is mediated by heterodimeric receptors designated integrins of the β1 subfamily, expressed on distinct cell types, including T lymphocytes. We have recently shown that flexible non-peptidie mimetics of RGD, in which the two ionic side groups were separated by a linear spacer of 11 atoms, bound specifically to the platelet integrin α11bβ3, and inhibited T cell-mediated immune responses. The present study was designed to (i) further characterize the structural requirements for RGD interactions with CD4+T cells, and (ii) examine the mechanisms by which the RGD mimetics interfere with immune cell reactivity in vivo. We now report that freezing the conformational degrees of freedom in the spacer chain, which fixes the relative orientation of the guanidinium and carboxylate side groups in a favourable manner, resutls in a higher level of inhibition of T cell binding to immobilized fibronectin, an RGD-containing ECM glycoprotein. In vitro, treatment of mice with relatively low doses of the RGD mimetics, but not the RGD peptide, inhibited the elicitation of an adoptively transferred DTH reaction. This inhibition was achieved by direct impairment the ability of antigen-primed lymph node cells to migrate and accumulate in inflammatory sites. Hence, we suggest that the design and production of non-peptidic mimetics of RGD offers a novel approach to study defined parameters related to the structure-function requirements of small adhesion epitopes. Furthermore, this approach could be used therapeutically to inhibit pathological processes which depend on RCJD recognition." @default.
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• W2090925079 date "1994-02-01" @default.
• W2090925079 modified "2023-09-25" @default.
• W2090925079 title "Inhibition of CD4+ T lymphocyte binding to fibronectin and immune-cell accumulation in inflammatory sites by non-peptidic mimetics of Arg-Gly-Asp" @default.
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• W2090925079 doi "https://doi.org/10.1111/j.1365-2249.1994.tb06522.x" @default.
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