Protective effect of luteolin on cigarette smoke extract‑induced cellular toxicity and apoptosis in normal human bronchial epithelial cells via the Nrf2 pathway

  • Authors:
    • Xiaobin Tan
    • Ping Jin
    • Liang Feng
    • Jie Song
    • E. Sun
    • Wenbo Liu
    • Luan Shu
    • Xiaobin Jia
  • View Affiliations

  • Published online on: January 30, 2014     https://doi.org/10.3892/or.2014.3007
  • Pages: 1855-1862
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Abstract

Luteolin, one of the most common abundant flavonoids in vegetables and herbs, has antitumor effects on various tumors by inducing apoptosis, antioxidant effects and inhibition of angiogenesis. However, the potential chemoprevention of luteolin on lung cell damage and its related mechanism(s) are not fully known. The present study evaluated the protective effects of luteolin on cigarette smoke extract (CSE)-induced toxicity and apoptosis in normal human bronchial epithelial (NHBE) cells and explored its underlying mechanism(s). MTT assay showed that pretreatment with luteolin increased CSE-decreased cell viability (p<0.05). Luteolin increased cellular glutathione (GSH) levels but decreased reactive oxygen species (ROS) generation (p<0.05). Cytometry assay and western blot analysis showed that luteolin attenuated CSE-induced apoptosis and apoptosis‑related protein activation, including caspase‑3, -8 and -9 (p<0.05). The expression of CSE-induced NAD(P)H: quinone oxidoreductase 1 (NQO1) and heme oxygenase-1 (HO-1) were decreased significantly by luteolin (p<0.05). Furthermore, luteolin attenuated CSE-induced apoptosis, noticeably reduced CSE-induced expression of NF-E2-related factor 2 (Nrf2), NQO1 and HO-1 using a small interfering RNA (siRNA) transfection assay. The data demonstrated that CSE-induced oxidative damage and apoptosis through the Nrf2 pathway was inhibited by luteolin and it may serve as a chemopreventive agent for the prevention and treatment of lung cancer.

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April 2014
Volume 31 Issue 4

Print ISSN: 1021-335X
Online ISSN:1791-2431

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APA
Tan, X., Jin, P., Feng, L., Song, J., Sun, E., Liu, W. ... Jia, X. (2014). Protective effect of luteolin on cigarette smoke extract‑induced cellular toxicity and apoptosis in normal human bronchial epithelial cells via the Nrf2 pathway. Oncology Reports, 31, 1855-1862. https://doi.org/10.3892/or.2014.3007
MLA
Tan, X., Jin, P., Feng, L., Song, J., Sun, E., Liu, W., Shu, L., Jia, X."Protective effect of luteolin on cigarette smoke extract‑induced cellular toxicity and apoptosis in normal human bronchial epithelial cells via the Nrf2 pathway". Oncology Reports 31.4 (2014): 1855-1862.
Chicago
Tan, X., Jin, P., Feng, L., Song, J., Sun, E., Liu, W., Shu, L., Jia, X."Protective effect of luteolin on cigarette smoke extract‑induced cellular toxicity and apoptosis in normal human bronchial epithelial cells via the Nrf2 pathway". Oncology Reports 31, no. 4 (2014): 1855-1862. https://doi.org/10.3892/or.2014.3007