Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0268596 (EMA)
 2,520 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Engagement of the tumor necrosis factor-alpha (TNF-alpha) receptors by the TNF-alpha ligand results in the rapid induction of TNF-alpha gene expression. The study presented here shows that autoregulation of TNF-alpha gene transcription by selective signaling through tumor necrosis factor receptor 1 (TNFR1) requires p38 mitogen-activated protein (MAP) kinase activity and the binding of the transcription factors ATF-2 and Jun to the TNF-alpha cAMP-response element (CRE) promoter element. Consistent with these findings, TNFR1 engagement results in increased p38 MAP kinase activity and p38-dependent phosphorylation of ATF-2. Furthermore, overexpression of MADD (MAP kinase-activating death domain protein), an adapter protein that binds to the death domain of TNFR1 and activates MAP kinase cascades, results in CRE-dependent induction of TNF-alpha gene expression. Thus, the TNF-alpha CRE site is the target of TNFR1 stimulation and mediates the autoregulation of TNF-alpha gene transcription.
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PMID:Engagement of tumor necrosis factor (TNF) receptor 1 leads to ATF-2- and p38 mitogen-activated protein kinase-dependent TNF-alpha gene expression. 1052 81

The proper display of transmembrane receptors on the leading edge of migrating cells and cell extensions is essential for their response to guidance cues. We previously discovered that MADD-4, which is an ADAMTSL secreted by motor neurons in Caenorhabditis elegans, interacts with an UNC-40/EVA-1 co-receptor complex on muscles to attract plasma membrane extensions called muscle arms. In nematodes, the muscle arm termini harbor the post-synaptic elements of the neuromuscular junction. Through a forward genetic screen for mutants with disrupted muscle arm extension, we discovered that a LAMMER kinase, which we call MADD-3, is required for the proper display of the EVA-1 receptor on the muscle's plasma membrane. Without MADD-3, EVA-1 levels decrease concomitantly with a reduction of the late-endosomal marker RAB-7. Through a genetic suppressor screen, we found that the levels of EVA-1 and RAB-7 can be restored in madd-3 mutants by eliminating the function of a p38 MAP kinase pathway. We also found that EVA-1 and RAB-7 will accumulate in madd-3 mutants upon disrupting CUP-5, which is a mucolipin ortholog required for proper lysosome function. Together, our data suggests that the MADD-3 LAMMER kinase antagonizes the p38-mediated endosomal trafficking of EVA-1 to the lysosome. In this way, MADD-3 ensures that sufficient levels of EVA-1 are present to guide muscle arm extension towards the source of the MADD-4 guidance cue.
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PMID:The MADD-3 LAMMER Kinase Interacts with a p38 MAP Kinase Pathway to Regulate the Display of the EVA-1 Guidance Receptor in Caenorhabditis elegans. 2712 83