Fig. 2.
IL-3, Epo, and Tpo specifically activate both JNK1 and JNK2. FDC-P2 cells (left 2 lanes), FD-EPO cells (middle 2 lanes), and FD-TPO cells (right 2 lanes) were stimulated with IL-3, Epo, or Tpo, respectively, for 0 minutes (−) or 15 minutes (+). In-gel JNK assays were performed in the immunoprecipitates with anti-JNK1 (A) or anti-JNK2 (B) antibody. The immunoprecipitates were separated by SDS-polyacrylamide gels containing GST-c-Jun and incubated with [γ-32P]ATP after protein renaturation. The phosphorylated GST-c-Jun corresponding to the molecular weights of JNK1 (46 kD) and JNK2 (55 kD) are indicated by arrows.