Wnt5a inhibits B cell proliferation and functions as a tumor suppressor in hematopoietic tissue
Graduate School of Biomedical Sciences; Department of Cell Biology; Department of Pathology; Department of Molecular Genetics and Microbiology; Department of Cancer Biology
Medical Subject Headings
Animals; B-Lymphocytes; Calcium; Cell Division; Cells, Cultured; Cyclin D1; Flow Cytometry; Hematopoietic System; Humans; Interleukin-7; Leukemia, Myeloid; Loss of Heterozygosity; Lymphoid Tissue; Lymphoma, B-Cell; Mice; Mice, Knockout; Proto-Oncogene Proteins; Signal Transduction; Transplantation, Heterologous; Wnt Proteins
Life Sciences | Medicine and Health Sciences
Wnt5a is a member of the Wnt family of secreted glycoproteins that play essential organizing roles in development. Similar to other Wnt members, Wnt5a can upregulate cell proliferation and has been proposed to have oncogenic function. Here we report that Wnt5a signals through the noncanonical Wnt/Ca++ pathway to suppress cyclin D1 expression and negatively regulate B cell proliferation in a cell-autonomous manner. Wnt5a hemizygous mice develop myeloid leukemias and B cell lymphomas that are clonal in origin and display loss of Wnt5a function in tumor tissues. Furthermore, analysis of human primary leukemias reveals deletion of the WNT5A gene and/or loss of WNT5A expression in a majority of the patient samples. These results demonstrate that Wnt5a suppresses hematopoietic malignancies.
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Citation: Cancer Cell. 2003 Nov;4(5):349-60.