Abstract:
:Chromosomal rearrangements involving receptor tyrosine kinases (RTK) are a clinically relevant oncogenic mechanism in human cancers. These chimeric oncoproteins often contain the C-terminal kinase domain of the RTK joined in cis to various N-terminal, nonkinase fusion partners. The functional role of the N-terminal fusion partner in RTK fusion oncoproteins is poorly understood. Here, we show that distinct N-terminal fusion partners drive differential subcellular localization, which imparts distinct cell signaling and oncogenic properties of different, clinically relevant ROS1 RTK fusion oncoproteins. SDC4-ROS1 and SLC34A2-ROS1 fusion oncoproteins resided on endosomes and activated the MAPK pathway. CD74-ROS1 variants that localized instead to the endoplasmic reticulum (ER) showed compromised activation of MAPK. Forced relocalization of CD74-ROS1 from the ER to endosomes restored MAPK signaling. ROS1 fusion oncoproteins that better activate MAPK formed more aggressive tumors. Thus, differential subcellular localization controlled by the N-terminal fusion partner regulates the oncogenic mechanisms and output of certain RTK fusion oncoproteins. SIGNIFICANCE: ROS1 fusion oncoproteins exhibit differential activation of MAPK signaling according to subcellular localization, with ROS1 fusions localized to endosomes, the strongest activators of MAPK signaling.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Neel DS,Allegakoen DV,Olivas V,Mayekar MK,Hemmati G,Chatterjee N,Blakely CM,McCoach CE,Rotow JK,Le A,Karachaliou N,Rosell R,Riess JW,Nichols R,Doebele RC,Bivona TGdoi
10.1158/0008-5472.CAN-18-1492subject
Has Abstractpub_date
2019-02-01 00:00:00pages
546-556issue
3eissn
0008-5472issn
1538-7445pii
0008-5472.CAN-18-1492journal_volume
79pub_type
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