Title:Raddeanin A Improves the Therapeutic Effect of Osimertinib in NSCLC by
Accelerating ROS/NLRP3-mediated Pyroptosis
Volume: 29
Issue: 32
Author(s): Liping Lin, Xuan Wu, Yuanxue Jiang, Xi Luo and Xiaolong Cao*
Affiliation:
- Department of Oncology, Panyu Central Hospital, Guangzhou, China
- Cancer Institute of Panyu, Guangzhou, China
Keywords:
Osimertinib, NSCLC, Raddeanin A, ROS, NLRP3, chemoresistance, pyroptosis.
Abstract:
Background: Osimertinib (Osm) is the preferred treatment for non-small cell lung cancer (NSCLC)
patients with the epidermal growth factor receptor (EGFR) T790M mutation. Nevertheless, the resistance of
NSCLC cells to Osm will eventually develop, which remains the biggest obstacle to treating such diseases.
Raddeanin A (RA) exhibits a potent anti-tumor effect on various types of cancer cells. In this study, we aimed
to investigate whether RA suppresses NSCLC growth and increases the therapeutic effect of Osm.
Methods: The effects of RA on inhibiting NSCLC cell viability and proliferation were tested using cell counting
kit 8 (CCK-8) and EdU assay. The roles of RA in improving the anti-tumor effect of Osm were tested with
CCK-8 and colony formation assays. The roles of RA in regulating reactive oxygen species (ROS)/NOD-, LRR-,
and pyrin domain-containing protein 3 (NLRP3)-mediated pyroptosis were assessed using quantitative real-
time PCR (qRT-PCR) and western blotting analysis.
Results: RA treatment decreased A549 and H1975 cell viability in a dose- and time-dependent way. RA inhibited
NSCLC cell proliferation and tumor growth in vivo. Mechanistically, RA induced ROS overgeneration
and resulted in subsequent NLRP3-mediated pyroptosis. In particular, combination treatment with Osm and
RA reduced cell viability and clonogenic growth capacity more efficiently than Osm mono treatment in A549
and H1975 cells. Combination treatment also promoted NLRP3-mediated pyroptosis more efficiently than
Osm mono treatment.
Conclusion: RA inhibited the NSCLC growth and increased the anti-tumor role of Osm in NSCLC by facilitating
ROS/NLRP3-mediated pyroptosis. These results suggested that combination therapy with RA and Osm
might be an effective strategy to treat Osm-resistant NSCLC.