摘要：SummaryNeuroblastoma is a highly heterogeneous embryonal solid tumor of the sympathetic nervous system. As some tumors can be treated to undergo differentiation, investigating this process can guide differentiation-based therapies of neuroblastoma. Here, we studied the role of E3 ubiquitin ligases Cbl and Cbl-b in regulation of long-term signaling responses associated with extracellular signal-regulated kinase phosphorylation and neurite outgrowth, a morphological marker of neuroblastoma cell differentiation. Using quantitative mass spectrometry (MS)-based proteomics, we analyzed how the neuroblastoma cell line proteome, phosphoproteome, and ubiquitylome were affected by Cbl and Cbl-b depletion. To quantitatively assess neurite outgrowth, we developed a high-throughput microscopy assay that was applied in combination with inhibitor studies to pinpoint signaling underlying neurite outgrowth and to functionally validate proteins identified in the MS data sets. Using this combined approach, we identified a role for SHP-2 and CDK16 in Cbl/Cbl-b-dependent regulation of extracellular signal-regulated kinase phosphorylation and neurite outgrowth, highlighting their involvement in neuroblastoma cell differentiation.Graphical abstractDisplay OmittedHighlights•Multi-layered proteomics captures cellular changes induced by Cbl/Cbl-b depletion•SHP-2 and CDK16 protein and phosphorylation levels increase upon Cbl/Cbl-b depletion•SHP-2 and CDK16 regulate phospho-ERK and neurite outgrowth in neuroblastoma cells•Inhibition of SHP-2 or CDK16 reverts Cbl/Cbl-b knockdown effects on differentiationCell Biology; Systems Biology; Proteomics
