Proteomics

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Liver lineage confers sensitivity of cancer cells to sulfonation-dependent alkylators: PDX and Immobilized Drug Enrichment


ABSTRACT: The small molecule YC-1 was identified as identified as a selectively active agent against subsets of the two major live cancer subtypes, intrahepatic cholangiocarcinoma and hepatocellular carcinoma. Response to YC-1 is dependent on the expression of the sulfotransferase SULT1A1, which activates YC-1 through sulfonation. The contributions of mass spectrometry to the study were: (i) identifying SULT1A1 as the key player in YC-1 response through observing the protein in a cell line with acquired resistance to the small molecule treatment, (ii) corroborating the role of SULT1A1 in the YC-1 activity by correlating protein expression profiles and drug responses across 37 biliary cancer cell lines, (iii) showing that SULT1A1 expression was associated with IDH mutations, FGFR2 fusion, and BAP1 loss in vivo studying patient-derived xenograft (PDX) models, and (iv) identifying protein targets in a protein enrichment experiment with an immobilized drug. (iii) PDX samples were analyzed using TMT multiplexing on an Orbitrap Fusion mass spectrometer using the SPS-MS3 method. Prior to analysis, samples were fractionated offline using high pH reversed chromatography (12 fractions per TMT set). Three TMT sets were analyzed (ShiBardeesy_PDX_TMT1, ShiBardeesy_PDX_TMT2, and ShiBardeesy_PDX_TMT3), and samples were labeled as follows with channel (bridge channel, 130c): ShiBardeesy_PDX_TMT1: SS101 (126), MG12 (127c), SS106 (127n), MG62 (128c), MG26 (128n), LCCH13 (129c), LCCH3 (129n), Q12050 (130n). ShiBardeesy_PDX_TMT2: SS102 (126), SS110 (127n), MG34 (128c), MG17 (128n), LCCH4 (129c), MG68 (129n), HBT110 (130n). ShiBardeesy_PDX_TMT3: SS103 (126), MG10 (127n), MG59 (128c), MG25 (128n), LCCH10 (129c), MG73 (129n), HBT211 (130n). (iv) Samples from experiments using immobilized small molecules to determine direct interactors of YC-1 were performed using TMT10-barcoding and the SPS-MS3 method on an Orbitrap Lumos mass spectrometer. No off-line fraction was performed. Samples were grouped into two TMT sets (ShiBardeesy_ImmobilizedDrug_TMT1 and ShiBardeesy_ImmobilizedDrug_TMT2). Channel 131N was used as the bridge channel. Samples were labeled as follows: ShiBardeesy_ImmobilizedDrug_TMT1: immobilized_inactiveYC-1_rep_1 (126), immobilized_inactiveYC-1_rep_2 (128n), immobilized_inactiveYC-1_rep_3 (128c), immobilized_YC-1_rep_1 (129n), immobilized_YC-1_plus_soluble_YC-1_competitor_rep_1 (130c). ShiBardeesy_ImmobilizedDrug_TMT2: immobilized_YC-1_rep_2 (127n), immobilized_YC-1_plus_soluble_YC-1_competitor_rep_2 (128n), immobilized_YC-1_plus_soluble_YC-1_competitor_rep_3 (129c), immobilized_YC-1_rep_3 (130c).

INSTRUMENT(S): Orbitrap Fusion Lumos, Orbitrap Fusion

ORGANISM(S): Homo Sapiens (ncbitaxon:9606)

SUBMITTER: Nabeel Bardeesy  

PROVIDER: MSV000090808 | MassIVE | Tue Nov 29 13:26:00 GMT 2022

REPOSITORIES: MassIVE

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