Abstract：
:The phosphorylation of eIF4E1 at serine 209 by MNK1 or MNK2 has been shown to initiate oncogenic mRNA translation, a process that favours cancer development and maintenance. Here, we interrogate the MNK-eIF4E axis in diffuse large B-cell lymphoma (DLBCL) and show a distinct distribution of MNK1 and MNK2 in germinal centre B-cell (GCB) and activated B-cell (ABC) DLBCL. Despite displaying a differential distribution in GCB and ABC, both MNKs functionally complement each other to sustain cell survival. MNK inhibition ablates eIF4E1 phosphorylation and concurrently enhances eIF4E3 expression. Loss of MNK protein itself downregulates total eIF4E1 protein level by reducing eIF4E1 mRNA polysomal loading without affecting total mRNA level or stability. Enhanced eIF4E3 expression marginally suppresses eIF4E1-driven translation but exhibits a unique translatome that unveils a novel role for eIF4E3 in translation initiation. We propose that MNKs can modulate oncogenic translation by regulating eIF4E1-eIF4E3 levels and activity in DLBCL.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Landon AL,Muniandy PA,Shetty AC,Lehrmann E,Volpon L,Houng S,Zhang Y,Dai B,Peroutka R,Mazan-Mamczarz K,Steinhardt J,Mahurkar A,Becker KG,Borden KL,Gartenhaus RBdoi
10.1038/ncomms6413subject
Has Abstractpub_date
2014-11-18 00:00:00pages
5413issn
2041-1723pii
ncomms6413journal_volume
5pub_type
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