STIP overexpression confers oncogenic potential to human non‐small cell lung cancer cells by regulating cell cycle and apoptosis |
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| Authors: | Yani Tang Guobei Yan Xin Song Kuangpei Wu Zhen Li Chao Yang Tanggang Deng Yang Sun Xiaoxiao Hu Cai Yang Huarong Bai Hui Li Weihong Tan Mao Ye Jing Liu |
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| Institution: | 1. Molecular Science and Biomedicine Laboratory, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Biology, College of Chemistry and Chemical Engineering, Collaborative Innovation Center for Molecular Engineering for Theranostics, Hunan University, Changsha, Hunan, China;2. Cancer Biotherapy Center, Tumour Hospital of Yunnan Province Affiliated with Kunming Medical University, Kunming, Yunnan, China;3. School of Life Sciences, State Key Laboratory of Medical Genetics, Central South University, Changsha, Hunan, China |
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| Abstract: | Sip1/tuftelin‐interacting protein (STIP), a multidomain nuclear protein, is a novel factor associated with the spliceosome, yet its role and molecular function in cancer remain unknown. In this study, we show, for the first time, that STIP is overexpressed in non‐small cell lung cancer (NSCLC) tissues compared to adjacent normal lung tissues. The depletion of endogenous STIP inhibited NSCLC cell proliferation in vitro and in vivo, caused cell cycle arrest and induced apoptosis. Cell cycle arrest at the G2/M phase was associated with the expression and activity of the cyclin B1‐CDK1 (cyclin‐dependent kinase 1) complex. We also provide evidence that STIP knockdown induced apoptosis by activating both caspase‐9 and caspase‐3 and by altering the Bcl‐2/Bax expression ratio. RNA sequencing data indicated that the MAPK mitogen‐activated protein kinases, Wnt, PI3K/AKT, and NF‐κB (nuclear factor kappa‐light‐chain‐enhancer of activated B cells) signalling pathways might be involved in STIP‐mediated tumour regulation. Collectively, these results suggest that STIP may be a novel potential diagnostic and therapeutic target for NSCLC. |
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| Keywords: | lung cancer cell cycle apoptosis caspase proliferation |
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