Protein tyrosine kinase 7 is involved in Wnt/β‐catenin canonical signalling. Protein tyrosine kinase 7 is involved in Wnt/β‐catenin canonical signalling.

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Protein tyrosine kinase 7 is involved in Wnt/β‐catenin canonical signalling. Protein tyrosine kinase 7 is involved in Wnt/β‐catenin canonical signalling. (A) HCT116 cells were stably transfected with shRNAs directed against PTK7 (shPTK7.1 or shPTK7.2) or luciferase (shLuc). PTK7 expression was assessed by FACS analysis and western blotting. (B) pSuper8xTOP or FOPFlash firefly luciferase reporter plasmids and pBeta–Renilla vector were transfected into HCT116 shPTK7 or shLuc cells along with Wnt3a–Myc‐expressing plasmid or a relative empty vector (pCAGGS–Myc). Relative luciferase units normalized to pCAGGS–Myc TOP values (RLU fold) are represented. Error bars represent s.e. values and statistical analyses were performed by using a Student's t‐test in at least three independent experiments. (C) Indicated proteins were revealed by western blotting in protein extracts of MEFs deficient in (−/−) or expressing (+/+) PTK7. (D) MEFs were nucleofected with pSuper8xTOP/FOPFlash (pSuper8xFOPFlash not shown) reporter plasmids, pBeta–Renilla vector and the indicated expression vector combinations. Relative luciferase units normalized to TOP‐empty vectors values (RLU fold) are represented. Expression of Wnt3a–Myc and PTK7 was revealed by western blotting in protein extracts and cell culture supernatants (Wnt3a). Error bars represent s.e. values and statistical analyses were performed by using a Student's t‐test in at least three independent experiments. (E) After nucleofection of Wnt3a–Myc‐expressing plasmid and proteasome inhibition treatment, by MG132 and NEM, proteins extracted from MEF cells were immunoprecipitated with β‐catenin mouse antibody and bound proteins were revealed by western blot with the mentioned antibodies (ubiquitin, PTK7 and β‐catenin). Expression of Wnt3a–Myc was revealed by western blotting in cell culture supernatants (Myc). Blots are representative of at least three independent experiments. FACS, fluorescence‐activated cell sorting; MEF, mouse embryonic fibroblast; MG132, N‐(benzyloxycarbonyl)leucinylleucinylleucinal; NEM, N‐ethylmaleimide; PTK7, protein tyrosine kinase 7; RLU, relative luciferase unit; shRNA, short hairpin RNA. Francesca Puppo et al. EMBO Rep. 2011;12:43-49 © as stated in the article, figure or figure legend