Long-term stimulation of areca nut components results in increased chemoresistance through elevated autophagic activity

Ching Yu Yen, Wei Fan Chiang, Shyun Yeu Liu, Pse Chou Cheng, Sheng Yang Lee, Wen Zhai Hong, Pin Yen Lin, Mei Huei Lin, Young Chau Liu

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Background: We previously demonstrated the autophagy-inducing activity in the crude extract of areca nut (ANE) and its 30-100 kDa fraction (ANE 30-100 K). This study aimed to analyze whether chronic ANE and ANE 30-100 K stimulations lead to higher stress resistance and autophagic activity in oral cells, and whether the resulting autophagic status in stimulated cells correlates with stress resistance. Materials and Methods: Malignant cells from the mouth oral epidermoid carcinoma Meng-1 (OECM-1) and blood (Jurkat T) origins were stimulated with non-cytotoxic ANE and ANE 30-100 K for 3 months. Sensitivity to anticancer drugs of and autophagy status in stimulated cells, analyzed respectively by XTT assay and calculating microtubule-associated protein 1 light chain 3-II LC3-II/β-actin ratios from Western blot, were compared to non-treated cells. Autophagy inhibitors, 3-methyladenine (3-MA) and chloroquine (CQ), were used to assess whether autophagy inhibition interferes the altered chemoresistance. Results: Areca nut extract-stimulated (ANE-s) and ANE 30-100 K-stimulated (30-100 K-s) OECM-1 and Jurkat T cells generally exhibited higher cisplatin and 5-fluorouracil (5-FU) resistances, compared to non-stimulated cells. Most stimulated cells expressed significantly higher levels of LC3-II and Atg4B proteins. Interestingly, these cells also showed stronger tolerances against hypoxia environment and expressed higher LC3-II levels under glucose-deprived and hypoxia conditions. Finally, both 3-MA and CQ alleviated, albeit to different degrees, the increased chemoresistance in ANE-s and/or 30-100 K-s cells. Conclusions: Chronic stimulations of ANE or ANE 30-100 K may increase tolerance of oral cancer and leukemia T cells to anticancer drugs, as well as to glucose deprivation and hypoxia conditions, and cause an elevation of autophagy activity responsible for increased drug resistance.

Original languageEnglish
Pages (from-to)91-96
Number of pages6
JournalJournal of Oral Pathology and Medicine
Volume43
Issue number2
DOIs
Publication statusPublished - Feb 2014

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Keywords

  • 5-fluorouracil
  • Areca nut
  • Autophagy
  • Chemoresistance
  • Cisplatin

ASJC Scopus subject areas

  • Cancer Research
  • Pathology and Forensic Medicine
  • Otorhinolaryngology
  • Oral Surgery
  • Periodontics
  • Medicine(all)

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