Autophagic degradation of epidermal growth factor receptor in gefitinib-resistant lung cancer by celastrol

Su Wei Xu, Betty Yuen Kwan Law, Simon Wing Fai Mok, Elaine Lai Han Leung, Xing Xing Fan, Paolo Saul Coghi, Wu Zeng, Chung Hang Leung, Edmond Dik Lung MA, Liang LIU, Vincent Kam Wai Wong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Drug resistance of non-small cell lung cancer (NSCLC) is highly correlated to the mutation of the epidermal growth factor receptor (EGFR). Although EGFR tyrosine kinase inhibitors (TKIs) are available clinically, the molecular complexity of NSCLC has made it necessary to search for alternative therapeutic approaches to overcome the drug resistance of NSCLC. In the present study, we identified a triterpene molecule derived from the herbal plant Tripterygium wilfordii, celastrol, as a novel autophagy inducer. We demonstrate that celastrol exhibited selective cytotoxic effect towards EGFR mutant NSCLCs. In addition, celastrol also facilitated the autophagic degradation of Hsp90 client protein including EGFR and Akt on both EGFR wild-type and mutant NSCLCs via calcium-mediated autophagy. Blockage of celastrol-induced autophagic degradation of EGFR by autophagic inhibitor or calcium chelator decreased celastrol-mediated cell death in gefitinib-resistant NSCLCs. Overall, our findings suggest that celastrol may be developed as an effective anticancer agent for treatment of gefitinib-resistant NSCLC in the future.

Original languageEnglish
Pages (from-to)1576-1588
Number of pages13
JournalInternational Journal of Oncology
Volume49
Issue number4
DOIs
Publication statusPublished - Oct 2016

Scopus Subject Areas

  • Oncology
  • Cancer Research

User-Defined Keywords

  • Autophagy
  • Calcium
  • Celastrol
  • Epidermal growth factor receptor
  • Gefitinib-resistant lung cancer

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