Abstract:
:Mutations in Pkd1, encoding polycystin-1 (PC1), cause autosomal-dominant polycystic kidney disease (ADPKD). We show that the carboxy-terminal tail (CTT) of PC1 is released by γ-secretase-mediated cleavage and regulates the Wnt and CHOP pathways by binding the transcription factors TCF and CHOP, disrupting their interaction with the common transcriptional coactivator p300. Loss of PC1 causes increased proliferation and apoptosis, while reintroducing PC1-CTT into cultured Pkd1 null cells reestablishes normal growth rate, suppresses apoptosis, and prevents cyst formation. Inhibition of γ-secretase activity impairs the ability of PC1 to suppress growth and apoptosis and leads to cyst formation in cultured renal epithelial cells. Expression of the PC1-CTT is sufficient to rescue the dorsal body curvature phenotype in zebrafish embryos resulting from either γ-secretase inhibition or suppression of Pkd1 expression. Thus, γ-secretase-dependent release of the PC1-CTT creates a protein fragment whose expression is sufficient to suppress ADPKD-related phenotypes in vitro and in vivo.
journal_name
Dev Celljournal_title
Developmental cellauthors
Merrick D,Chapin H,Baggs JE,Yu Z,Somlo S,Sun Z,Hogenesch JB,Caplan MJdoi
10.1016/j.devcel.2011.10.028subject
Has Abstractpub_date
2012-01-17 00:00:00pages
197-210issue
1eissn
1534-5807issn
1878-1551pii
S1534-5807(11)00480-1journal_volume
22pub_type
杂志文章abstract::The ability of the death ligand TRAIL to induce tumor cell apoptosis has led to the development of TRAIL-based cancer therapies. Reporting recently in Molecular Cell, Lu et al. (2014) show that the basis for differential TRAIL responses involves clustering of death receptor complexes by E-cadherin and the actin cytosk...
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