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Overexpression of PIP5KL1 suppresses cell proliferation and migration in human gastric cancer cells

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Abstract

Phosphatidylinositol-4-phosphate 5-kinase-like 1 (PIP5KL1), the forth member of phosphatidylinositol-4-phosphate 5-kinases (PIPKs) type I, acts as a scaffold for localization and activation of PIPKs, which mediates numerous cellular processes. However, the role of PIP5KL1 in the development of human cancer is still lacking. We therefore examined the expression of PIP5KL1 in human normal and cancer tissues by tissue microarrays (TMAs). Reverse transcription-polymerase chain reaction (RT-PCR) and immunofluorescence imaging analysis were used to testify the mRNA and protein levels of PIP5KL1 in human gastric cancer cell line (BGC823). The cell proliferation was investigated with 3-(4,5)-dimethylthiahiazo (-z-y1)-3,5-di-phenytetrazoliumromide (MTT) assay. Both wound healing and transwell migration assay were performed to study the cell migration. The phosphorylation of v-akt murine thymoma viral oncogene homolog 1 (AKT1) was determined by western immunoblot analysis. Immunostaining of gastric cancer tissue microarrays revealed a negative correlation between PIP5KL1 overexpression and gastric cancer in situ. Transient transfection PIP5KL1 induced a significant increase expression at both transcriptional and translational levels and consequent robust inhibition of proliferation (P < 0.05) and migration (P < 0.05) of BGC823 cells. Overexpression of PIP5KL1 markedly inhibited (P < 0.05) serum-induced phosphorylation of AKT1. Taken together, these studies indicate a functional negative correlation between elevated levels of PIP5KL1 and the development of human gastric cancer, suggesting that PIP5KL1 overexpression may suppress gastric cancer formation.

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Authors and Affiliations

  1. State Key Laboratory of Molecular Oncology, Cancer Institute and Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, People’s Republic of China

    Lan Shi, Mei Zhao, Qing Luo, Yi-Ming Ma, Jia-Ling Zhong, Xing-Hua Yuan & Chang-Zhi Huang

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  1. Lan Shi
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  2. Mei Zhao
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  3. Qing Luo
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  4. Yi-Ming Ma
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  7. Chang-Zhi Huang
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Correspondence to Chang-Zhi Huang.

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Shi, L., Zhao, M., Luo, Q. et al. Overexpression of PIP5KL1 suppresses cell proliferation and migration in human gastric cancer cells. Mol Biol Rep 37, 2189–2198 (2010). https://doi.org/10.1007/s11033-009-9701-5

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  • DOI: https://doi.org/10.1007/s11033-009-9701-5

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