Activation of Wnt/beta-catenin/Tcf signaling in mouse skin carcinogenesis.
Although Wnt/beta-catenin/Tcf signaling pathway has been shown to be an important factor in the development of many malignancies including colorectal, ovarian, prostate, and many other cancers, little is known about its role in non-melanoma skin cancers. Here, we report the first evidence that beta-catenin/Tcf signaling pathway is constitutively activated in non-melanocytic skin tumors induced by two stage chemical carcinogenesis protocol. Mouse skin tumors showed cytoplasmic and nuclear accumulation of beta-catenin, and upregulation of beta-catenin/Tcf target genes (c-myc and c-jun). We found high levels of skin-expressed Wnt proteins (Wnt 3, 4, and 10b) in different parts of the tumors, likely representing key upstream events in beta-catenin/Tcf activation during mouse skin carcinogenesis. Inhibition of beta-catenin/Tcf signaling by ectopic expression of dominant negative Tcf4 resulted in significant inhibition of growth in squamous cell carcinoma cells. A role of the constitutive activation of beta-catenin/Tcf signaling in skin carcinogenesis is discussed.
Bhatia
Neehar
N
Department of Dermatology, University of Wisconsin Medical School, 1300 University Avenue B-25, Madison, WI 53706, USA.
Spiegelman
Vladimir S
VS
D000818:Animals; D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000473:pathology; D045744:Cell Line, Tumor; D003598:Cytoskeletal Proteins / Q000235:genetics / Q000502:physiology*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000502:physiology*; D004195:Disease Models, Animal; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics / Q000502:physiology*; D051821:Lymphoid Enhancer-Binding Factor 1; D051379:Mice; D008815:Mice, Inbred Strains; D010212:Papilloma / Q000235:genetics / Q000473:pathology; D012313:RNA / Q000235:genetics / Q000302:isolation & purification; D015398:Signal Transduction; D012878:Skin Neoplasms / Q000235:genetics* / Q000473:pathology; D015534:Trans-Activators / Q000235:genetics / Q000502:physiology*; D014157:Transcription Factors / Q000235:genetics / Q000502:physiology*; D051153:Wnt Proteins; D051176:beta Catenin
C495267:CTNNB1 protein, mouse; D003598:Cytoskeletal Proteins; D004268:DNA-Binding Proteins; D036341:Intercellular Signaling Peptides and Proteins; D051821:Lymphoid Enhancer-Binding Factor 1; D015534:Trans-Activators; D014157:Transcription Factors; D051153:Wnt Proteins; D051176:beta Catenin; D012313:RNA