{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T12:34:07Z","timestamp":1771504447310,"version":"3.50.1"},"reference-count":62,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T00:00:00Z","timestamp":1771459200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Kathleen Lonsdale Institute for Human Health Research at Maynooth University"},{"name":"Research Ireland Pathway Programme","award":["22\/PATH-S\/10713"],"award-info":[{"award-number":["22\/PATH-S\/10713"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biomolecules"],"abstract":"<jats:p>Multiple myeloma (MM) is characterised by the clonal expansion of plasma cells in the bone marrow followed by end-organ damage. Despite a significant increase in the five-year survival rate in recent years, MM is still considered an incurable disease as patients will repeatedly relapse and develop resistance to standard-of-care therapies. A central theme for the personalization of MM therapy is understanding the biological mechanisms of drug resistance and identifying clinically relevant biomarkers of therapeutic response. Highly effective protocols for the enrichment of phosphorylated peptides followed by high-resolution mass spectrometry makes possible the quantitation of thousands of site-specific phosphorylation events, principally on serine, threonine or tyrosine residues. In this study, phosphoproteomic analysis of 20 MM patient cell lysates was performed, stratified based on their ex vivo drug response profiles to Bortezomib and Lenalidomide, two of the most foundational therapeutic agents in the management of MM. In this study, patients who are highly sensitive to these drugs show increased phosphorylation of proteins concerned with translation and RNA processing including the spliceosome, RNA transport and RNA binding pathways, while highly resistant patients demonstrated an increased phosphorylation of proteins involved with tight junctions, the Rap1 signalling pathway and the phosphatidylinositol signalling system. This study has established a phosphoproteomic dataset displaying unique phosphorylation signatures associated with drug sensitivity in MM patient plasma cells. The identification of phosphorylation signatures associated with drug resistance provides the foundation for further exploration of these mechanisms and associated signalling pathways to further characterise drug resistance mechanisms in MM and identify promising biomarkers of therapeutic response and targets for drug re-sensitization in MM.<\/jats:p>","DOI":"10.3390\/biom16020323","type":"journal-article","created":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T11:44:27Z","timestamp":1771501467000},"page":"323","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Phosphoproteomic Profiling of Multiple Myeloma Based on Ex Vivo Drug Sensitivity Resistance Testing Identifies Phosphorylation Signatures Associated with Drug Response"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7681-8675","authenticated-orcid":false,"given":"Katie","family":"Dunphy","sequence":"first","affiliation":[{"name":"Department of Biology, Maynooth University, W23 V5XH Kildare, Ireland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ellen","family":"Purcell","sequence":"additional","affiliation":[{"name":"Department of Biology, Maynooth University, W23 V5XH Kildare, Ireland"},{"name":"Kathleen Lonsdale Institute for Human Health Research, Maynooth University, W23 V5XH Kildare, Ireland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4324-8706","authenticated-orcid":false,"given":"Caroline A.","family":"Heckman","sequence":"additional","affiliation":[{"name":"Institute for Molecular Medicine Finland-FIMM, HiLIFE, University of Helsinki, 00290 Helsinki, Finland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9290-9267","authenticated-orcid":false,"given":"Paul","family":"Dowling","sequence":"additional","affiliation":[{"name":"Department of Biology, Maynooth University, W23 V5XH Kildare, Ireland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0934-1106","authenticated-orcid":false,"given":"Despina","family":"Bazou","sequence":"additional","affiliation":[{"name":"Department of Biology, Maynooth University, W23 V5XH Kildare, Ireland"},{"name":"Kathleen Lonsdale Institute for Human Health Research, Maynooth University, W23 V5XH Kildare, Ireland"},{"name":"School of Biomolecular and Biomedical Sciences, University College Dublin, D04 V1W8 Dublin, Ireland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter","family":"O\u2019Gorman","sequence":"additional","affiliation":[{"name":"Department of Haematology, Mater Misericordiae University Hospital, D07 R2WY Dublin, Ireland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,2,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"233","DOI":"10.1038\/labinvest.2017.118","article-title":"Histidine kinases and the missing phosphoproteome from prokaryotes to eukaryotes","volume":"98","author":"Adam","year":"2018","journal-title":"Lab. 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