Nicotine enhances store‑operated calcium entry by upregulating HIF‑1α and SOCC components in non‑small cell lung cancer cells.

Abstract:

:Store‑operated calcium entry (SOCE) is critical for regulating the proliferation and metastasis of various cancer types. The present study aimed to investigate the role of SOCE on nicotine‑promoted proliferation of non‑small cell lung cancer (NSCLC) A549 cells. Cell proliferation was evaluated by BrdU incorporation assay. The SOCE and basal [Ca2+]i in NSCLC A549 cells were determined using Fura‑2 fluorescence microscopy. The mRNA and protein expression levels were determined by real‑time quantitative PCR and western blotting, respectively. The results demonstrated that, in A549 cells, the detectable store‑operated calcium channel (SOCC) components were TRPC proteins 1, 3, 4 and 6 and Orail, among which TRPC1, TRPC6 and Orai1 are expressed at relatively high levels with TRPC3 and TRPC4 at relatively low levels. Nicotine upregulated the mRNA and protein expression of TRPC1, TRPC6 and Orai1, increased basal [Ca2+]i and enhanced SOCE. Promotion of cell proliferation but not migration was observed in the nicotine‑treated cells, which was inhibited by SOCE inhibitor SKF‑96365. Furthermore, nicotine upregulated HIF‑1α expression in the A549 and NCI‑H292 cells. Silencing of HIF‑1α abrogated the increases in TRPCs and Orail and reversed the increases in basal [Ca2+]i and SOCE. Meanwhile, suppression of proliferation was observed in cells following HIF‑1α silencing. In conclusion, the results indicate that nicotine promotes lung cancer cell proliferation likely by upregulating HIF‑1α and SOCC components and therefore enhancing SOCE and increasing basal [Ca2+]i.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Wang Y,He J,Jiang H,Zhang Q,Yang H,Xu X,Zhang C,Xu C,Wang J,Lu W

doi

10.3892/or.2018.6580

subject

Has Abstract

pub_date

2018-10-01 00:00:00

pages

2097-2104

issue

4

eissn

1021-335X

issn

1791-2431

journal_volume

40

pub_type

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