eIF4E and eIF4GI have distinct and differential imprints on multiple myeloma's proteome and signaling
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Oshrat Attar-Schneider1,3, Metsada Pasmanik-Chor4, Shelly Tartakover-Matalon1,3, Liat Drucker1,3,*, Michael Lishner1,2,3,*
1Oncogenetic Laboratory, Meir Medical Center, Kfar Saba, Israel
2Department of Internal Medicine, Meir Medical Center, Kfar Saba, Israel
3Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
4Bioinformatics Unit, G.S.W. Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
*These authors have contributed equally to this work
Liat Drucker, e-mail: [email protected]
Keywords: Multiple Myeloma, Translation initiation, eIF4GI, eIF4E, Bioinformatics
Received: November 24, 2014 Accepted: December 21, 2014 Published: January 29, 2015
Accumulating data indicate translation plays a role in cancer biology, particularly its rate limiting stage of initiation. Despite this evolving recognition, the function and importance of specific translation initiation factors is unresolved. The eukaryotic translation initiation complex eIF4F consists of eIF4E and eIF4G at a 1:1 ratio. Although it is expected that they display interdependent functions, several publications suggest independent mechanisms.
This study is the first to directly assess the relative contribution of eIF4F components to the expressed cellular proteome, transcription factors, microRNAs, and phenotype in a malignancy known for extensive protein synthesis-multiple myeloma (MM). Previously, we have shown that eIF4E/eIF4GI attenuation (siRNA/Avastin) deleteriously affected MM cells’ fate and reduced levels of eIF4E/eIF4GI established targets. Here, we demonstrated that eIF4E/eIF4GI indeed have individual influences on cell proteome. We used an objective, high throughput assay of mRNA microarrays to examine the significance of eIF4E/eIF4GI silencing to several cellular facets such as transcription factors, microRNAs and phenotype. We showed different imprints for eIF4E and eIF4GI in all assayed aspects. These results promote our understanding of the relative contribution and importance of eIF4E and eIF4GI to the malignant phenotype and shed light on their function in eIF4F translation initiation complex.
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