Reduced expression levels of PTEN are associated with decreased sensitivity of HCC827 cells to icotinib.

Abstract:

:The clinical resistance of non-small cell lung cancer (NSCLC) to epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs) has been linked to EGFR T790M resistance mutations or MET amplifications. Additional mechanisms underlying EGFR-TKI drug resistance remain unclear. The present study demonstrated that icotinib significantly inhibited the proliferation and increased the apoptosis rate of HCC827 cells; the cellular mRNA and protein expression levels of phosphatase and tensin homolog (PTEN) were also significantly downregulated. To investigate the effect of PTEN expression levels on the sensitivity of HCC827 cells to icotinib, PTEN expression was silenced using a PTEN-specific small interfering RNA. The current study identified that the downregulation of PTEN expression levels may promote cellular proliferation in addition to decreasing the apoptosis of HCC827 cells, and may reduce the sensitivity of HCC827 cells to icotinib. These results suggested that reduced PTEN expression levels were associated with the decreased sensitivity of HCC827 cells to icotinib. Furthermore, PTEN expression levels may be a useful marker for predicting icotinib resistance and elucidating the resistance mechanisms underlying EGFR-mutated NSCLC.

journal_name

Oncol Lett

journal_title

Oncology letters

authors

Zhai Y,Zhang Y,Nan K,Liang X

doi

10.3892/ol.2017.5829

subject

Has Abstract

pub_date

2017-05-01 00:00:00

pages

3233-3238

issue

5

eissn

1792-1074

issn

1792-1082

pii

OL-0-0-5829

journal_volume

13

pub_type

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