Title : Differential requirement of EGF receptor and its tyrosine kinase for AP-1 transactivation induced by EGF and TPA.

Pub. Date : 2003 Jan 16

PMID : 12527890






10 Functional Relationships(s)
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1 Differential requirement of EGF receptor and its tyrosine kinase for AP-1 transactivation induced by EGF and TPA. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
2 It is thought that the 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced AP-1 activity is because of the activation of the PKC/MAPK/AP-1 pathway, although the detailed molecular mechanism has not been fully characterized. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
3 It is thought that the 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced AP-1 activity is because of the activation of the PKC/MAPK/AP-1 pathway, although the detailed molecular mechanism has not been fully characterized. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
4 It is thought that the 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced AP-1 activity is because of the activation of the PKC/MAPK/AP-1 pathway, although the detailed molecular mechanism has not been fully characterized. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
5 It is thought that the 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced AP-1 activity is because of the activation of the PKC/MAPK/AP-1 pathway, although the detailed molecular mechanism has not been fully characterized. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
6 Currently, little is known about whether EGFR or its tyrosine kinase is necessary for TPA-induced AP-1 activation. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
7 We demonstrated that the TPA or epidermal growth factor (EGF) induced AP-1 activation in the B82L cells that express wild-type EGFR, but not in the B82 cell, whereas autophosphorylation at tyrosine(1173) of EGFR in B82L cells was only induced by EGF, but not TPA. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
8 The expression of tyrosine kinase-deficient EGFR (mutation at Lys-721) (B82M721) resulted in deficiency of AP-1 induction in cellular response to EGF, while TPA treatment led to fully AP-1 activation. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
9 Based on these results, we conclude that TPA-induced AP-1 activation requires the basal level-EGFR protein, but not EGFR tyrosine kinase and EGFR autophosphorylation at tyrosine(1173), whereas both EGFR tyrosine kinase and EGFR autophosphorylation at Y(1173) play a critical role in EGF-induced AP-1 activation. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
10 Based on these results, we conclude that TPA-induced AP-1 activation requires the basal level-EGFR protein, but not EGFR tyrosine kinase and EGFR autophosphorylation at tyrosine(1173), whereas both EGFR tyrosine kinase and EGFR autophosphorylation at Y(1173) play a critical role in EGF-induced AP-1 activation. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus