Human DF3/MUC1 carcinoma-associated protein functions as an oncogene.
The human DF3/MUC1 mucin-like glycoprotein is aberrantly overexpressed by most carcinomas of the breast and other epithelia. The contribution of MUC1 overexpression to the malignant phenotype is, however, not known. In the present studies, we have stably expressed MUC1 in rat 3Y1 fibroblasts. MUC1-positive cells were selected from independent transfections. The results demonstrate that, as found in human carcinomas, MUC1 is expressed on the cell surface and as a complex with beta-catenin in the nucleus of the transfectants. Colony formation in soft agar demonstrates that cells expressing MUC1, but not the empty vector, exhibit anchorage-independent growth. The results also show that MUC1 expression confers tumor formation in nude mice. These findings provide the first evidence that MUC1 induces cellular transformation.
Li
Yongqing
Y
Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA.
Liu
Derek
D
Chen
Dongshu
D
Kharbanda
Surender
S
Kufe
Donald
D
D000818:Animals; D000951:Antigens, Neoplasm / Q000235:genetics* / Q000378:metabolism*; D014408:Biomarkers, Tumor / Q000235:genetics / Q000378:metabolism; D015197:Carcinogenicity Tests; D002462:Cell Membrane; D002467:Cell Nucleus / Q000378:metabolism; D003598:Cytoskeletal Proteins / Q000378:metabolism; D005347:Fibroblasts / Q000378:metabolism / Q000473:pathology; D005786:Gene Expression Regulation; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D018396:Mucin-1 / Q000235:genetics / Q000378:metabolism; D009857:Oncogenes; D051381:Rats; D015534:Trans-Activators / Q000378:metabolism; D014410:Tumor Stem Cell Assay; D051176:beta Catenin
D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; C495270:CTNNB1 protein, human; C495267:CTNNB1 protein, mouse; C495268:Ctnnb1 protein, rat; D003598:Cytoskeletal Proteins; D018396:Mucin-1; D015534:Trans-Activators; D051176:beta Catenin