expression of anion exchanger 1 sequestrates p16 in the cytoplasm in gastric, colonic adenocarcinoma
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ID: 183664
2007
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Abstract
p16INK4A (p16) binds to cyclin-dependent kinase 4/6, negatively regulates cell growth. Recent studies have led to an understanding of additional biologic functions for p16; however, the detailed mechanisms involved are still elusive. In this article, we show an unexpected expression of anion exchanger 1 (AEi) in the cytoplasm in poorly, moderately differentiated gastric, colonic adenocarcinoma cells, in its interaction with p16, thereby sequestrating the protein in the cytoplasm. Genetic alterations of p16, AEi were not detectable. Forced expression of AEi in these cells sequestrated more p16 in the cytoplasm, whereas small interfering RNA-mediated silencing of AEi in the cells induced the release of p16 from the cytoplasm to the nucleus, leading to cell death, growth inhibition of tumor cells. By analyzing tissue samples obtained from patients with gastric, colonic cancers, we found that 83.33% of gastric cancers, 56.52% of colonic cancers coexpressed AEi, p16 in the cytoplasm. We conclude that AEi plays a crucial role in the pathogenesis of gastric, colonic adenocarcinoma, that p16 dysfunction is a novel pathway of carcinogenesis.
| Reference Key |
shen2007neoplasia:expression
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|---|---|
| Authors | ;Wei-Wei Shen;Jun Wu;Li Cai;Bing-Ya Liu;Yan Gao;Guo-Qiang Chen;Guo-Hui Fu |
| Journal | ACS chemical neuroscience |
| Year | 2007 |
| DOI |
10.1593/neo.07403
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| URL | |
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