Fingolimod sensitizes EGFR wild‑type non‑small cell lung cancer cells to lapatinib or sorafenib and induces cell cycle arrest.

Abstract:

:Epidermal growth factor receptor (EGFR) is a receptor tyrosine kinase and mutations in this gene are major drivers of lung cancer development. EGFR tyrosine kinase inhibitors (TKIs) are standard first‑line therapies for patients with advanced non‑small cell lung cancer (NSCLC) with activating EGFR mutations, but are not effective in patients with wild‑type EGFR. In the present study, the cytotoxic effects of various TKIs against EGFR were investigated in wild‑type NSCLC cells as single treatments or in combination with Fingolimod (FTY720), which has been approved for treating multiple sclerosis and has cytotoxic effects against several tumor cell lines. It was found that the combined treatment with TKIs lapatinib (Lap) or sorafenib (Sor) and FTY720 synergistically suppressed the viability of the NSCLC cell lines A549 and H596. Additionally, FTY720 inhibited lysosomal acidification and suppressed autophagy flux. Immunoblotting and reverse transcription‑quantitative polymerase chain reaction showed that FTY720 combined with Lap or Sor, enhanced endoplasmic reticulum (ER) stress loading and cell cycle arrest in A549 cells. The enhancement of ER stress loading and cell cycle arrest induced by combined treatment with Lap or Sor and FTY720, which was associated with the cytotoxicity induced by the combination of these drugs. These findings suggested that FTY720 improved TKI therapy in NSCLC patients with wild‑type EGFR, by sensitizing NSCLC cells to TKIs.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Ota K,Okuma T,Lorenzo A,Yokota A,Hino H,Kazama H,Moriya S,Takano N,Hiramoto M,Miyazawa K

doi

10.3892/or.2019.7140

subject

Has Abstract

pub_date

2019-07-01 00:00:00

pages

231-242

issue

1

eissn

1021-335X

issn

1791-2431

journal_volume

42

pub_type

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