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p53-dependent anticancer effects of leptomycin B on lung adenocarcinoma

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Abstract

Purpose

Leptomycin B (LMB) and/or its derivatives are considered a novel class of cancer therapeutics through blocking chromosome maintenance region 1, which mediates p53 nuclear export. The objectives of the present study were to first evaluate the cytotoxic effects of LMB on a normal human lung epithelial cell line (BEAS-2B) and three human lung adenocarcinoma cell lines with various p53 status (wild type: A549, mutant: NCI-H522, and null: NCI-H358) and then to identify LMB-induced gene expression alterations in human p53 signaling pathway.

Methods

Cells were treated with 0.01–100 nM LMB or 0.1% ethanol (vehicle control) for 4–72 h. Gene expression analyses using gene array for 84 genes involved in p53-mediated signaling pathways were performed in A549 and NCI-H358 after treatment with 20 nM LMB or vehicle control for 24 h.

Results

Cytotoxic results from MTS assays revealed a significant dose- and time-dependent effect of LMB on all cell lines. However, this effect was more pronounced in cancer cells than in normal cells, and cancer cells with p53 wild type tended to be less sensitive than those with p53 mutant or null. A total of 23 genes, predominantly involved in apoptosis and cell cycle/proliferation, were significantly altered in A549 after LMB treatment, while no strong modulating effects were observed in NCI-H358. The protein expression of two selected genes, p21 and survivin, was further confirmed by Western blots.

Conclusion

Our results suggest that LMB has anti-cancer potential and provides a new regimen of individualized therapy for lung cancer treatment.

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Authors and Affiliations

  1. Department of Environmental Toxicology, The Institute of Environmental and Human Health (TIEHH), Texas Tech University, Box 41163, Lubbock, TX, 79409, USA

    Changxia Shao, Chuanwen Lu, Lixia Chen & Weimin Gao

  2. Department of Pediatrics, Section of Medical Genetics, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, USA

    Patrick P. Koty

  3. Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, 79415, USA

    Everardo Cobos & Weimin Gao

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  1. Changxia Shao
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  2. Chuanwen Lu
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Correspondence to Weimin Gao.

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Shao, C., Lu, C., Chen, L. et al. p53-dependent anticancer effects of leptomycin B on lung adenocarcinoma. Cancer Chemother Pharmacol 67, 1369–1380 (2011). https://doi.org/10.1007/s00280-010-1434-6

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