A1 Refereed original research article in a scientific journal
Different responses of colorectal cancer cells to alternative sequences of cetuximab and oxaliplatin
Authors: Narvi E, Vaparanta K, Karrila A, Chakroborty D, Knuutila S, Pulliainen A, Sundvall M, Elenius K
Publication year: 2018
Journal: Scientific Reports
Journal name in source: Scientific reports
Journal acronym: Sci Rep
Article number: 16579
Volume: 8
Number of pages: 13
ISSN: 2045-2322
eISSN: 2045-2322
DOI: https://doi.org/10.1038/s41598-018-34938-y
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/36414879
Therapeutic protocols including EGFR antibodies in the context of oxaliplatin-based regimens have variable clinical effect in colorectal cancer. Here, we tested the effect of the EGFR antibody cetuximab in different sequential combinations with oxaliplatin on the growth of colorectal cancer cells in vitro and in vivo. Cetuximab reduced the efficacy of oxaliplatin when administered before oxaliplatin but provided additive effect when administered after oxaliplatin regardless of the KRAS or BRAF mutation status of the cells. Systemic gene expression and protein phosphorylation screens revealed alternatively activated pathways regulating apoptosis, cell cycle and DNA damage response. Functional assays indicated that cetuximab-induced arrest of the cells into the G1 phase of the cell cycle was associated with reduced responsiveness of the cells to subsequent treatment with oxaliplatin. In contrast, oxaliplatin-enhanced responsiveness to subsequent treatment with cetuximab was associated with increased apoptosis, inhibition of STAT3 activity and increased EGFR down-regulation. This preclinical study indicates that optimizing the sequence of administration may enhance the antitumor effect of combination therapy with EGFR antibodies and oxaliplatin.
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