Reversing chemoresistance by small molecule inhibition of the translation initiation complex eIF4F |
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Authors: | Cencic Regina Hall David R Robert Francis Du Yuhong Min Jaeki Li Lian Qui Min Lewis Iestyn Kurtkaya Serdar Dingledine Ray Fu Haian Kozakov Dima Vajda Sandor Pelletier Jerry |
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Affiliation: | Department of Biochemistry, McGill University, Montreal, QC, Canada H3G 1Y6. |
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Abstract: | Deregulation of cap-dependent translation is associated with cancer initiation and progression. The rate-limiting step of protein synthesis is the loading of ribosomes onto mRNA templates stimulated by the heterotrimeric complex, eukaryotic initiation factor (eIF)4F. This step represents an attractive target for anticancer drug discovery because it resides at the nexus of the TOR signaling pathway. We have undertaken an ultra-high-throughput screen to identify inhibitors that prevent assembly of the eIF4F complex. One of the identified compounds blocks interaction between two subunits of eIF4F. As a consequence, cap-dependent translation is inhibited. This compound can reverse tumor chemoresistance in a genetically engineered lymphoma mouse model by sensitizing cells to the proapoptotic action of DNA damage. Molecular modeling experiments provide insight into the mechanism of action of this small molecule inhibitor. Our experiments validate targeting the eIF4F complex as a strategy for cancer therapy to modulate chemosensitivity. |
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Keywords: | chemical genetics eIF4E:eIF4G inhibitor lymphoma translation inhibitor |
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