A central paradox in transforming growth factor beta (TGF-?) biology is how the same growth factor can induce such divergent responses as growth stimulation (i.e., mesenchymal cells) and growth inhibition (i.e., epithelial cells)? Considering the pivotal role TGF-? has in a number of normal and pathological conditions, addressing that issue is fundamental if we hope to develop specific intervention strategies. To that end, we have been investigating the general hypothesis that the cellular response to TGF-? is dependent upon an integrated action of the trafficking and signaling machinery. In support of that proposal, we provide evidence that (i) a unique motif in the type II TGF-? receptor (T2R) regulates basolateral membrane delivery via a non-canonical mechanism;(ii) sorting nexin 9 (SNX9) distinguishes Smad3-dependent responses from Smad2;and (iii) the induction of ErbB family members is critical to the mesenchymal cell phenotype regulated by TGF-?. In this competing renewal we will extend these concepts using a variety of biochemical, biological, and morphologic approaches. First, we will determine the role of the mammalian retromer complex in regulating TGF-?R trafficking. As a number of diseases result from defects in the ability to sort or transport proteins to defined cellular locales, characterizing the operative trans-acting factors provides potential mechanisms to alter the cellular response to TGF-?. Second, the mechanism(s) by which SNX9 controls Smad3 transcriptional activity will be characterized. Given that the majority of Smad-dependent transcription is mediated via Smad3, these studies raise the possibility that intervention strategies can be developed to enhance or diminish Smad3-specific responses. Third, the role of EGF family members in pro-fibrotic TGF-? signaling will be defined. Since TGF-? is regulated by the concerted action of both direct and indirect mediators, our finding that ErbB ligands are fundamental for the pro-fibrotic phenotype seen following addition of TGF-? suggests new paradigms to the genesis of tissue fibrosis.
TGF-? is a protein which can be either helpful or harmful to human health. While its ability to stimulate cell growth is important for normal wound healing, when unchecked the function of many organs can be disrupted by scar (i.e., fibrosis) formation. Conversely, the growth inhibitory actions of TGF-? are critical in preventing cancer. The proposed studies will identify/characterize targets which can be used to either increase or decrease these responses.
|Basal, E; Ayeni, T; Zhang, Q et al. (2016) Patterns of MÃ¼llerian Inhibiting Substance Type II and Candidate Type I Receptors in Epithelial Ovarian Cancer. Curr Mol Med 16:222-31|
|Andrianifahanana, Mahefatiana; Hernandez, Danielle M; Yin, Xueqian et al. (2016) Profibrotic up-regulation of glucose transporter 1 by TGF-Î² involves activation of MEK and mammalian target of rapamycin complex 2 pathways. FASEB J 30:3733-3744|
|Janardhanan, Rajiv; Yang, Binxia; Kilari, Sreenivasulu et al. (2016) The Role of Repeat Administration of Adventitial Delivery of Lentivirus-shRNA-Vegf-A in Arteriovenous Fistula to Prevent Venous Stenosis Formation. J Vasc Interv Radiol 27:576-83|
|Yang, Binxia; Brahmbhatt, Akshaar; Nieves Torres, Evelyn et al. (2016) Tracking and Therapeutic Value of Human Adipose Tissue-derived Mesenchymal Stem Cell Transplantation in Reducing Venous Neointimal Hyperplasia Associated with Arteriovenous Fistula. Radiology 279:513-22|
|Nallet-Staub, Flore; Yin, Xueqian; Gilbert, CristÃ¨le et al. (2015) Cell density sensing alters TGF-Î² signaling in a cell-type-specific manner, independent from Hippo pathway activation. Dev Cell 32:640-51|
|Wilkes, Mark C; Repellin, Claire E; Kang, Jeong-Han et al. (2015) Sorting nexin 9 differentiates ligand-activated Smad3 from Smad2 for nuclear import and transforming growth factor Î² signaling. Mol Biol Cell 26:3879-91|
|Wang, Ying; Cao, Ying; Yamada, Satsuki et al. (2015) Cardiomyopathy and Worsened Ischemic Heart Failure in SM22-Î± Cre-Mediated Neuropilin-1 Null Mice: Dysregulation of PGC1Î± and Mitochondrial Homeostasis. Arterioscler Thromb Vasc Biol 35:1401-12|
|Yang, Binxia; Janardhanan, Rajiv; Vohra, Pawan et al. (2014) Adventitial transduction of lentivirus-shRNA-VEGF-A in arteriovenous fistula reduces venous stenosis formation. Kidney Int 85:289-306|
|Nieves Torres, Evelyn C; Yang, Binxia; Roy, Bhaskar et al. (2014) Adventitial delivery of lentivirus-shRNA-ADAMTS-1 reduces venous stenosis formation in arteriovenous fistula. PLoS One 9:e94510|
|Andrianifahanana, Mahefatiana; Wilkes, Mark C; Gupta, Shiv K et al. (2013) Profibrotic TGFÎ² responses require the cooperative action of PDGF and ErbB receptor tyrosine kinases. FASEB J 27:4444-54|
Showing the most recent 10 out of 18 publications