It would be also of interest to assess whether additional members of the EGFR family respond to H89 in a similar manner
It would be also of interest to assess whether additional members of the EGFR family respond to H89 in a similar manner. ACKNOWLEDGMENTS We thank Dr. by interfering with clathrin function. Therefore, the predominant distribution of inactive EGFR in the plasma membrane is not simply by default but entails a PKA-dependent restrictive condition resulting in receptor avoidance of endocytosis until it is stimulated by ligand. Furthermore, PKA inhibition may contribute to ligand-induced EGFR endocytosis because epidermal growth element inhibited 26% of PKA basal activity. On the other hand, H89 did not alter ligand-induced internalization of EGFR but doubled its half-time of down-regulation by retarding its segregation into degradative compartments, seemingly due to a delay in the receptor tyrosine phosphorylation and ubiquitylation. Our results reveal that PKA basal paederosidic acid activity…