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Spike-in enhanced phosphoproteomics uncovers synergistic signaling responses to MEK inhibition in colon cancer cells

Author

Listed:
  • Mirjam Bentum

    (Max Delbrück Center for Molecular Medicine
    Humboldt-Universität zu Berlin)

  • Bertram Klinger

    (Humboldt-Universität zu Berlin
    Charité-Universitätsmedizin Berlin)

  • Anja Sieber

    (Humboldt-Universität zu Berlin
    Charité-Universitätsmedizin Berlin)

  • Sheyda Naghiloo

    (Max Delbrück Center for Molecular Medicine)

  • Henrik Zauber

    (Max Delbrück Center for Molecular Medicine)

  • Nadine Lehmann

    (Charité-Universitätsmedizin Berlin)

  • Mohamed Haji

    (Max Delbrück Center for Molecular Medicine)

  • Sylvia Niquet

    (Max Delbrück Center for Molecular Medicine
    Berlin Institute of Health)

  • Philipp Mertins

    (Max Delbrück Center for Molecular Medicine
    Berlin Institute of Health)

  • Nils Blüthgen

    (Humboldt-Universität zu Berlin
    Charité-Universitätsmedizin Berlin)

  • Matthias Selbach

    (Max Delbrück Center for Molecular Medicine
    Charité-Universitätsmedizin Berlin)

Abstract

Targeted kinase inhibitors are a cornerstone of cancer therapy, but their success is often hindered by the complexity of cellular signaling networks that can lead to resistance. Overcoming this challenge necessitates a deep understanding of cellular signaling responses. While standard global phosphoproteomics offers extensive insights, lengthy processing times, the complexity of data interpretation, and frequent omission of crucial phosphorylation sites limit its utility. Here, we combine data-independent acquisition (DIA) with spike-in of synthetic heavy stable isotope-labeled phosphopeptides to facilitate the targeted detection of particularly informative phosphorylation sites. Our spike-in enhanced detection in DIA (SPIED-DIA) approach integrates the improved sensitivity of spike-in-based targeted detection with the discovery potential of global phosphoproteomics into a simple workflow. We employed this method to investigate synergistic signaling responses in colorectal cancer cell lines following MEK inhibition. Our findings highlight that combining MEK inhibition with growth factor stimulation synergistically activates JNK signaling in HCT116 cells. This synergy emphasizes the therapeutic potential of concurrently targeting MEK and JNK pathways, as evidenced by the significantly impaired growth of HCT116 cells when treated with both inhibitors. Our results demonstrate that SPIED-DIA effectively identifies synergistic signaling responses in colorectal cancer cells, presenting a valuable tool for uncovering new therapeutic targets and strategies in cancer treatment.

Suggested Citation

  • Mirjam Bentum & Bertram Klinger & Anja Sieber & Sheyda Naghiloo & Henrik Zauber & Nadine Lehmann & Mohamed Haji & Sylvia Niquet & Philipp Mertins & Nils Blüthgen & Matthias Selbach, 2025. "Spike-in enhanced phosphoproteomics uncovers synergistic signaling responses to MEK inhibition in colon cancer cells," Nature Communications, Nature, vol. 16(1), pages 1-16, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59404-y
    DOI: 10.1038/s41467-025-59404-y
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