Proteomics

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USP18-dependent muscle proteome

ABSTRACT: USP18 is an interferon type 1 (IFN-1) induced gene that negatively regulates the IFN-1 signalling pathway, which plays a role in many immune related pathologies. Dermatomyositis (DM) is characterised by excessive IFN-1 immune response and muscle degeneration. We found USP18 to be expressed in DM myofibers suggesting a role in muscle cell biology. USP18 depletion induced muscle cell differentiation under nutrient-rich conditions independent of IFN-1 signalling. Downregulation of cell cycle gene network and sarcomeric protein networks, and dysregulation of myogenic (co-)transcription regulators were found in USP18-depleted differentiated cells. Sarcomeric integrity of USP18-depleted cells deteriorated during muscle cell maturation. Our results revealed USP18 as a critical regulator at the intersection between proliferation and differentiation as well as during the maturation of muscle cells. We suggest that a USP18 IFN-1-independent pathway may contribute to muscle regeneration in muscle pathologies.

INSTRUMENT(S): Orbitrap Fusion Lumos

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Cell Culture

SUBMITTER: Cyriel Olie  

LAB HEAD: Benedikt M. Kessler

PROVIDER: PXD032406 | Pride | 2023-05-10

REPOSITORIES: Pride

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FL1269_MSQ2020_20201014_CyrielOlie_TP_dil1-10_MB1.raw Raw
FL1269_MSQ2020_20201014_CyrielOlie_TP_dil1-10_MB2.raw Raw
FL1269_MSQ2020_20201014_CyrielOlie_TP_dil1-10_MB3.raw Raw
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Publications

The ubiquitin proteasomal system is a critical regulator of muscle physiology, and impaired UPS is key in many muscle pathologies. Yet, little is known about the function of deubiquitinating enzymes (DUBs) in the muscle cell context. We performed a genetic screen to identify DUBs as potential regulators of muscle cell differentiation. Surprisingly, we observed that the depletion of ubiquitin-specific protease 18 (USP18) affected the differentiation of muscle cells. USP18 depletion first stimulat  ...[more]

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