Dataset Information

Inhibition of growth factor signaling prevents SARS-CoV-2 replication

ABSTRACT: Caco-2 cells were mock-infected or infected with SARS-CoV-2 patient isolates (in biological quintruplicates) for one hour, washed, and incubated for 24 hours before cell harvest. Extracted proteins were digested and split to 1) carry out whole-cell proteomics of a tandem mass tag (TMT) 10-plex samples using liquid chromatography synchronous precursor selection mass spectromety (LC-SPS-MS3), or 2) use Fe-NTA phosphopeptide enrichment (achieving 98% enrichment) for phospho proteome analyses of a TMT 10-plex analyzed by LC-MS2 First 5 channels = control Last 5 channels = infected

INSTRUMENT(S): Orbitrap Fusion Lumos

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Epithelial Cell, Colon

DISEASE(S): Covid-19

SUBMITTER: Kevin Klann

LAB HEAD: Christian Münch

PROVIDER: PXD018357 | Pride | 2020-05-15

REPOSITORIES: Pride

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Publications

Growth Factor Receptor Signaling Inhibition Prevents SARS-CoV-2 Replication.

Klann Kevin K Bojkova Denisa D Tascher Georg G Ciesek Sandra S Münch Christian C Cinatl Jindrich J

Molecular cell 20200811 1

SARS-CoV-2 infections are rapidly spreading around the globe. The rapid development of therapies is of major importance. However, our lack of understanding of the molecular processes and host cell signaling events underlying SARS-CoV-2 infection hinders therapy development. We use a SARS-CoV-2 infection system in permissible human cells to study signaling changes by phosphoproteomics. We identify viral protein phosphorylation and define phosphorylation-driven host cell signaling changes upon inf ...[more]

PMID: 32877642

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Project description:Although malignant gliomas frequently show aberrant activation of the mammalian target of rapamycin (mTOR), mTOR inhibitors have performed poorly in clinical trials. Besides regulating cell growth and translation, mTOR controls the initiation of autophagy. By recycling cellular components, autophagy can mobilize energy resources, and has thus been attributed cancer-promoting effects. Here, we asked whether the activation of autophagy represents an escape mechanism to pharmacological mTOR inhibition, and explored co-treatment with mTOR and autophagy inhibitors as a therapeutic strategy. Mimicking conditions of the glioma microenvironment, glioma cells were exposed to nutrient starvation and hypoxia. Following treatment with mTOR inhibitor torin2 or rapamycin, and autophagy inhibitors bafilomycin A1 or MRT68921, we analyzed autophagic activity, cell growth, viability and oxygen consumption. Changes in global proteome were quantified by mass spectrometry. In the context of hypoxia and starvation, autophagy was strongly induced in glioma cells, and further increased by mTOR inhibition. While torin2 enhanced glioma cell survival, co-treatment with torin2 and bafilomycin A1 failed to promote cell death. Importantly, treatment with bafilomycin A1 alone also protected glioma cells from cell death. Mechanistically, both compounds significantly reduced glioma growth and oxygen consumption. Mass spectrometry analysis showed that bafilomycin A1 induced broad changes in the cellular proteome. More specifically, proteins downregulated by bafilomycin A1 were associated with the mitochondrial respiratory chain and ATP synthesis. Taken together, our results show that activation of autophagy does not account for the cytoprotective effects of mTOR inhibition in our in vitro model of the glioma microenvironment. Our proteomic findings suggest that the pharmacological inhibition of autophagy induces extensive changes in the cellular proteome that can support glioma cell survival under nutrient-deplete and hypoxic conditions. These findings provide a novel perspective on the complex role of autophagy in gliomas and may have implications for the design of future trials.

Dataset Information

Inhibition of growth factor signaling prevents SARS-CoV-2 replication

Publications

Growth Factor Receptor Signaling Inhibition Prevents SARS-CoV-2 Replication.

Similar Datasets

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