Magnesium-dependent Phosphatase (MDP) 1 is a Potential Suppressor of Gastric Cancer

Author(s): Jianbo Zhu, Lijuan Deng, Baozhen Chen, Wenqing Huang, Xiandong Lin, Gang Chen, Chi-Meng Tzeng*, Mingang Ying*, Zhongxian Lu*.

Journal Name: Current Cancer Drug Targets

Volume 19 , Issue 10 , 2019

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Graphical Abstract:


Abstract:

Background: Recurrence is the leading cause of treatment failure and death in patients with gastric cancer (GC). However, the mechanism underlying GC recurrence remains unclear, and prognostic markers are still lacking.

Methods: We analyzed DNA methylation profiles in gastric cancer cases with shorter survival (<1 year) or longer survival (> 3 years), and identified candidate genes associated with GC recurrence. Then, the biological effects of these genes on gastric cancer were studied.

Results: A novel gene, magnesium-dependent phosphatase 1 (mdp1), was identified as a candidate gene whose DNA methylation was higher in GC samples from patients with shorter survival and lower in patients with longer survival. MDP1 protein was highly expressed in GC tissues with longer survival time, and also had a tendency to be expressed in highly differentiated GC samples. Forced expression of MDP1 in GC cell line BGC-823 inhibited cell proliferation, whereas the knockdown of MDP1 protein promoted cell growth. Overexpression of MDP1 in BGC-823 cells also enhanced cell senescence and apoptosis. Cytoplasmic kinase protein c-Jun N-terminal kinase (JNK) and signal transducer and activator of transcription 3 (Stat3) were found to mediate the biological function of MDP1.

Conclusion: These results suggest that MDP1 protein suppresses the survival of gastric cancer cells and loss of MDP expression may benefit the recurrence of gastric cancer.

Keywords: Gastric cancer, prognosis marker, magnesium-dependent phosphatase 1, DNA methylation, MDP1 protein, Cytoplasmic kinase protein.

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VOLUME: 19
ISSUE: 10
Year: 2019
Page: [817 - 827]
Pages: 11
DOI: 10.2174/1568009619666190620112546
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