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Mount Sinai Hospital  >
Pawson, Tony >

Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/9431

Title: 'W' mutant forms of the Fms receptor tyrosine kinase act in a dominant manner to suppress CSF-1 dependent cellular transformation
Authors: Reith, AD
Ellis, C
Maroc, N
Pawson, Tony
Bernstein, A
Dubreuil, P
Keywords: Cell Transformation, Neoplastic
Macrophage Colony-Stimulating Factor
Protein-Tyrosine Kinase
Receptor, Macrophage Colony-Stimulating Factor
Receptors, Cell Surface
Issue Date: Jan-1993
Publisher: Nature Publishing Group
Citation: Oncogene. 1993 Jan;8(1):45-53
Abstract: Point mutations in highly conserved amino acid residues in the catalytic domain of the Kit receptor tyrosine kinase (RTK) are responsible for the coat color, fertility and hematopoietic defects of mice bearing mutant alleles at the dominant white-spotting (W) locus. The dominant nature of structural Kit mutations suggests that expression of other kinase-defective RTKs might also specifically interfere with signal transduction by normal receptors. To test this possibility, we have investigated the functional consequences of introducing analogous mutations into the RTK encoded by the c-fms proto-oncogene. Both Fms37 (glu582-->lys) and Fms42 (asp776-->asn) mutant proteins, corresponding to the strongly dominant-negative W37 and W42 mutant c-kit alleles, had undetectable in vitro kinase activity and were unable to transform Rat-2 fibroblasts in the presence of exogenous CSF-1. Moreover, expression of Fms37 or Fms42 proteins in Rat-2 cells specifically inhibited anchorage-independent growth mediated by the normal Fms receptor in the presence of exogenous CSF-1 and conferred a dominant loss of Fms-associated PI3-kinase activity on CSF-1 stimulation. Mutant RTKs, bearing point substitutions identical to those present in mild or severe W mutants, may provide a generally applicable strategy for inducing dominant loss of function defects in RTK-mediated signalling pathways.
URI: http://www.nature.com
http://hdl.handle.net/1807/9431
ISSN: 0950-9232
Appears in Collections:Pawson, Tony
Pawson, Tony

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