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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)
-