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Cancer - Principles & Practice of Oncology
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F7.CAP
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1999-06-07
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FIGURE 1-7. An example of immunoprecipitation. SK-LMS cells expressing
the tyrosine kinase growth factor receptor c-met were analyzed for
their Met autophosphorylation response to the ligand human growth
factor (HGF)/SF or to the naturally occurring variant NK2. Cells where
treated with either 200 units per milliliter of HGF as a positive
control (lane 6), were not treated (lane 5), or were treated with
increasing amounts of NK2 (lanes 1-4) for 10 min. After treatment,
lysates were prepared and immunoprecipitated with an anti-met
antibody. Immunoprecipitated proteins were resolved by SDS-PAGE under
reducing conditions and analyzed by Western blotting using an
anti-phosphotyrosine antibody which detects only proteins
phosphorylated on tyrosine (top panel). To show the total abundance of
both phosphorylated and nonphosphorylated Met, the blot was stripped
and reprobed with an anti-Met antibody (bottom panel). Comparison of
the two panels indicates that both ligands can mediate Met
autophosphorylation, although NK2 does so less efficiently than
HGF/SF. This result is surprising since NK2 does not induce
invasiveness of SK-LMS cells although HGF/SF does. (Lee J-H, Klein HG.
Cellular gene therapy. Transfus Med II 1995;9:91)