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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Pemberton, Janell Shivanyuk, Alexander Rebek, Julius Behrens, M. Margarita Bartfai, Tamas Gaidarova, Svetlana |
| Description | Author Affiliation: Bartfai T ( Department of Neuropharmacology, The Harold L. Dorris Neurological Research Center, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA. tbartfai@scripps.edu); |
| Abstract | Toll-like receptors (TLRs) and the type I IL-1 receptor (IL-1RI) are key components of the innate immune system activated by microbial infections and inflammation. The signaling cascade from agonist-occupied TLRs and IL-1Rs involves recruitment of the small cytosolic adapter protein MyD88 that binds to IL-1RI via homotypic interactions mediated by Toll/IL-1R/resistance (TIR) domains. Dominant negative forms and null mutations of MyD88 have recently been shown to preclude bacterial product or IL-1-mediated activation of NF-kappaB pathways, demonstrating that MyD88 is an essential component of the Toll receptor signaling. Here, we report the synthesis and pharmacological effects of a low molecular weight MyD88 mimic, hydrocinnamoyl-l-valyl pyrrolidine (compound 4a), modeled on a tripeptide sequence of the BB-loop [(F/Y)-(V/L/I)-(P/G)] of the TIR domain. Results are presented showing that compound 4a interferes with the interactions between mouse MyD88 and IL-1RI at the TIR domains. Compound 4a inhibited IL-1beta-induced phosphorylation of the mitogen-activated protein kinase p38 in EL4 thymoma cells and in freshly isolated murine lymphocytes in a concentration-dependent manner. In vivo, compound 4a produced a significant attenuation of the IL-1beta-induced fever response (200 mg/kg, i.p.). Inhibition of the TIR domain-mediated MyD88/IL1-RI interaction by a low molecular weight, cell-penetrating TIR domain mimic suggests an intracellular site for antiinflammatory drug action. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 13 |
| Volume Number | 100 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2003-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Antigens, Differentiation Chemistry Pyrrolidines Pharmacology Receptors, Immunologic Receptors, Interleukin-1 Valine Adaptor Proteins, Signal Transducing Animals Blotting, Western Densitometry Enzyme-Linked Immunosorbent Assay Genes, Dominant Interleukin-1 Metabolism Lipopolysaccharides Mice Mice, Inbred C57BL Mitogen-Activated Protein Kinases Models, Chemical Models, Molecular Mutation Myeloid Differentiation Factor 88 Precipitin Tests Protein Binding Protein Structure, Tertiary Chemical Synthesis Antagonists & Inhibitors Signal Transduction Spleen Time Factors Tumor Cells, Cultured Analogs & Derivatives P38 Mitogen-Activated Protein Kinases Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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