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Several ligands for Toll IL-1R (TIR) family are known to promote stabilization of a subset of short-lived mRNAs containing AU-rich elements (AREs) in their 3' untranslated regions. It is now evident however, that members of the TIR family may use distinct intracellular signaling pathways to achieve a spectrum of biological end points. Using human embryonic kidney 293 cells transfected to express different TIRs we now report that signals initiated through IL-1R1 or TLR4 but not TLR3 can promote the stabilization of unstable chemokine mRNAs. Similar results were obtained when signaling from endogenous receptors was examined using a mouse endothelial cell line (H5V). The ability of TIR family members to stabilize ARE-containing mRNAs results from their differential use of signaling adaptors MyD88, MyD88 adaptor-like protein, Toll receptor IFN-inducing factor (Trif), and Trif-related adaptor molecule. Overexpression of MyD88 or MyD88 adaptor-like protein was able to promote enhanced stability of ARE-containing mRNA, whereas Trif and Trif-related adaptor molecule exhibited markedly reduced capacity. Hence the ability of TIRs to signal stabilization of mRNA appears to be linked to the MyD88-dependent signaling pathway.

Toll IL-1 Receptors Differ in Their Ability to Promote the Stabilization of Adenosine and Uridine-Rich Elements Containing mRNA