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• W4310778971 abstract "Post-translational modification of G-protein coupled receptors (GPCRs) plays a central role in tissue hemostasis and cancer. The molecular mechanism of post-translational regulation of protease-activated receptors (PARs), a subgroup of GPCRs is yet understudied. Here we show that the cell-surface transmembrane E3 ubiquitin ligase ring finger 43 (RNF43) is a negative feedback regulator of PAR2, impacting PAR2-induced signaling and colon cancer growth. RNF43 co-associates with PAR2, promoting its membrane elimination and degradation as shown by reduced cell surface biotinylated PAR2 levels and polyubiquitination. PAR2 degradation is rescued by R-spondin2 in the presence of leucine-rich repeat-containing G-protein-coupled receptor5 (LGR5). In fact, PAR2 acts jointly with LGR5, as recapitulated by increased β-catenin levels, transcriptional activity, phospho-LRP6, and anchorage-independent colony growth in agar. Animal models of the chemically induced AOM/DSS colon cancer of wt versus Par2/f2rl1 KO mice as also the ‘spleen-liver’ colon cancer metastasis, allocated a central role for PAR2 in colon cancer growth and development. RNF43 is abundantly expressed in the Par2/f2rl1 KO-treated AOM/DSS colon tissues while its level is very low to nearly null in colon cancer adenocarcinomas of the wt mice. The same result is obtained in the ‘spleen-liver’ model of spleen-inoculated cells, metastasized to the liver. High RNF43 expression is observed in the liver upon shRNA -Par2 silencing. “Limited-dilution-assay” performed in mice in-vivo, assigned PAR2 as a member of the cancer stem cell niche compartment. Collectively, we elucidate an original regulation of PAR2 oncogene, a member of cancer stem cells, by RNF43 ubiquitin ligase. It impacts β-catenin signaling and colon cancer growth." @default.
• W4310778971 created "2022-12-17" @default.
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• W4310778971 date "2022-12-05" @default.
• W4310778971 modified "2023-09-28" @default.
• W4310778971 title "<scp>RNF43</scp> induces the turnover of protease‐activated receptor 2 in colon cancer" @default.
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• W4310778971 doi "https://doi.org/10.1096/fj.202200858rr" @default.
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