< Back to previous page

Publication

Hypoxia-induced cisplatin resistance in non-small cell lung cancer cells is mediated by HIF-1 alpha and mutant p53 and can be overcome by induction of oxidative stress

Journal Contribution - e-publication

The compound APR-246 (PRIMA-1(MET)) is a known reactivator of (mutant) p53 and inducer of oxidative stress which can sensitize cancer cells to platinum-based chemotherapeutics. However, the effect of a hypoxic tumor environment has been largely overlooked in this interaction. This study focusses on the role of hypoxia-inducible factor-1 alpha (HIF-1 alpha) and the p53 tumor suppressor protein in hypoxia-induced cisplatin resistance in non-small cell lung cancer (NSCLC) cells and the potential of APR-246 to overcome this resistance. We observed that hypoxia-induced cisplatin resistance only occurred in the p53 mutant NCI-H2228(Q331)* cell line, and not in the wild type A549 and mutant NCI-H1975(R273H) cell lines. Cisplatin reduced HIF-1 alpha protein levels in NCI-H2228(Q331)* cells, leading to a shift in expression from HIF-1 alpha-dependent to p53-dependent transcription targets under hypoxia. APR-246 was able to overcome hypoxia-induced cisplatin resistance in NCI-H2228(Q331)* cells in a synergistic manner without affecting mutant p53(Q331)* transcriptional activity, but significantly depleting total glutathione levels more efficiently under hypoxic conditions. Synergism was dependent on the presence of mutant p53(Q331)* and the induction of reactive oxygen species, with depletion of one or the other leading to loss of synergism. Our data further support the rationale of combining APR-246 with cisplatin in NSCLC, since their synergistic interaction is retained or enforced under hypoxic conditions in the presence of mutant p53.
Journal: Cancers
ISSN: 2072-6694
Volume: 10
Publication year:2018
Keywords:A1 Journal article
BOF-keylabel:yes
BOF-publication weight:3
CSS-citation score:2
Authors from:Higher Education
Accessibility:Open