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Pubmed ID :12941698
Publication Date : //

TLP, a novel modulator of TGF-beta signaling, has opposite effects on Smad2- and Smad3-dependent signaling.


Transforming growth factor-beta (TGF-beta) is a multifunctional cytokine signaling to the nucleus through cell surface transmembrane receptor serine/threonine kinases and cytoplasmic effectors, including Smad proteins. We describe a novel modulator of this pathway, TLP (TRAP-1-like protein), which is 25% identical to the previously described Smad4 chaperone, TRAP-1, and shows identical expression patterns in human tissues. Endogenous TLP associates with both active and kinase-deficient TGF-beta and activin type II receptors, but interacts with the common-mediator Smad4 only in the presence of TGF-beta/activin signaling. Overexpression of TLP represses the ability of TGF-beta to induce transcription from SBE-Luc, a Smad3/4-specific reporter, while it potentiates transcription from ARE-Luc, a Smad2/4-specific reporter. Consistent with this, TLP inhibits the formation of Smad3/4 complexes in the absence of effects on phosphorylation of Smad3, while it affects neither Smad2 phosphorylation nor hetero-oligomerization. We propose that TLP might regulate the balance of Smad2 and Smad3 signaling by localizing Smad4 intracellularly, thus contributing to cellular specificity of TGF-beta transcriptional responses in both normal and pathophysiology.

Authors : Felici Angelina , Wurthner Jens U , Parks W Tony , Giam Louise Ruh-yu , Reiss Michael , Karpova Tatiana S , McNally James G , Roberts Anita B ,

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