Mahameed, Mohamed and Wilhelm, Thomas and Darawshi, Odai and Obiedat, Akram and Tommy, Weiss-Sadan and Chintha, Chetan and Schubert, Thomas and Samali, Afshin and Chevet, Eric and Eriksson, Leif A. and Huber, Michael and Tirosh, Boaz (2019) The unfolded protein response modulators GSK2606414 and KIRA6 are potent KIT inhibitors. CELL DEATH & DISEASE, 10: 300. ISSN 2041-4889,
Full text not available from this repository. (Request a copy)Abstract
IRE1, PERK, and ATF6 are the three transducers of the mammalian canonical unfolded protein response (UPR). GSK2606414 is a potent inhibitor of PERK, while KIRA6 inhibits the kinase activity of IRE1. Both molecules are frequently used to probe the biological roles of the UPR in mammalian cells. In a direct binding assay, GSK2606414 bound to the cytoplasmic domain of KIT with dissociation constants (K-d) value of 664 +/- 294 nM whereas KIRA6 showed a K-d value of 10.8 +/- 2.9 mu M. In silico docking studies confirmed a compact interaction of GSK2606414 and KIRA6 with KIT ATP binding pocket. In cultured cells, GSK2606414 inhibited KIT tyrosine kinase activity at nanomolar concentrations and in a PERK-independent manner. Moreover, in contrast to other KIT inhibitors, GSK2606414 enhanced KIT endocytosis and its lysosomal degradation. Although KIRA6 also inhibited KIT at nanomolar concentrations, it did not prompt KIT degradation, and rescued KIT from GSK2606414-mediated degradation. Consistent with KIT inhibition, nanomolar concentrations of GSK2606414 and KIRA6 were sufficient to induce cell death in a KIT signaling-dependent mast cell leukemia cell line. Our data show for the first time that KIT is a shared target for two seemingly unrelated UPR inhibitors at concentrations that overlap with PERK and IRE1 inhibition. Furthermore, these data underscore discrepancies between in vitro binding measurements of kinase inhibitors and inhibition of the tyrosine kinase receptors in living cells.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | KINASE INHIBITOR; DASATINIB; RECEPTOR; CELLS; INTERNALIZATION; JUXTAMEMBRANE; ACTIVATION; DISCOVERY; IMATINIB; PATHWAY; |
| Subjects: | 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Apr 2020 09:46 |
| Last Modified: | 15 Apr 2020 09:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/27213 |
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