BackgroundPhospholipid phosphatase 4 (PPAPDC1A or PLPP4) has been demonstrated to be involved in the malignant process of many cancers. The purpose of this study was to investigate the clinical significance and biological roles of PLPP4 in lung carcinoma.MethodsPLPP4 expression was examined in 8 paired lung carcinoma tissues by real-time PCR and in 265 lung carcinoma tissues by immunohistochemistry (IHC). Statistical analysis was performed to evaluate the clinical correlation between PLPP4 expression and clinicopathological features and survival in lung carcinoma patients. In vitro and in vivo assays were performed to assess the biological roles of PLPP4 in lung carcinoma. Fluorescence-activated cell sorting, Western blotting and luciferase assays were used to identify the underlying pathway through which PLPP4 silencing mediates biological roles in lung carcinoma.ResultsPLPP4 is differentially elevated in lung adenocarcinoma (ADC) and lung squamous cell carcinoma (SQC) tissues. Statistical analysis demonstrated that high expression of PLPP4 significantly and positively correlated with clinicopathological features, including pathological grade, T category and stage, and poor overall and progression-free survival in lung carcinoma patients. Silencing PLPP4 inhibits proliferation and cell cycle progression in vitro and tumorigenesis in vivo in lung carcinoma cells. Our results further reveal that PLPP4 silencing inhibits Ca2+-permeable cationic channel, suggesting that downregulation of PLPP4 inhibits proliferation and tumorigenesis in lung carcinoma cells via reducing the influx of intracellular Ca2+.ConclusionOur results indicate that PLPP4 may hold promise as a novel marker for the diagnosis of lung carcinoma and as a potential therapeutic target to facilitate the development of novel treatment for lung carcinoma.Electronic supplementary materialThe online version of this article (10.1186/s12943-017-0717-5) contains supplementary material, which is available to authorized users.

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<p>In order to ensure the safe implementation of walking-type incremental launching steel box girder. Taking a simply supported wide steel box girder bridge as an example, this paper analyzes the local stress of the wide steel box girder with four supporting points of walking pusher, and quantitatively determines the three single parameter related control thresholds of lateral deflection, longitudinal pusher asynchrony and vertical lifting asynchrony that are concerned in the construction. Based on the single parameter control research, the two parameters dynamic control threshold range is proposed. The calculation results show that two parameters analysis provides a more reliable means for walking-type incremental launching construction and is a necessary supplement to the conventional single parameter control.</p>