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Published on: January 22, 2018
PLD3: In vitro functional characterization and autophagy pathway-mediated regulatory effects in gastric cancer
Yu Li1, Jinrui Geng1, Na Liu1
1First Clinical Medical College, Gansu University of Chinese Medicine, Lanzhou, 730000, China.
Background:
PLD3, a type-II transmembrane glycoprotein enriched in late endosomes and lysosomes, governs nucleic-acid turnover, immune signalling and intracellular homeostasis, and consequently influences both cell-cycle progression and programmed death. Although carcinoma of the stomach ranks among the most frequently diagnosed and lethal malignancies of the gastrointestinal tract, the precise functional dialogue between PLD3 and gastric tumorigenesis has yet to be elucidated.
Methods:
Bioinformatics workflows were applied to analyze gastric carcinoma datasets retrieved from The Cancer Genome Atlas (TCGA). Comprehensive analysis of PLD3 encompassed quantification of expression, survival outcomes, and analysis of its correlation with clinical stage and TNM staging system. RT-qPCR was employed to validate the expression levels of PLD3 in gastric carcinoma tissue and established cell lines. In vitro functional experiments were conducted to further investigate the biological functions of PLD3 in gastric cancer and its mechanistic association with autophagy.
Results:
Research shows PLD3 is markedly overexpressed in gastric carcinoma tissues, and its high expression is closely linked to reduced patient overall survival. Functional assays verified PLD3 knockdown notably impairs cancer cell malignant phenotypes; conversely, PLD3 overexpression boosts cancer cell malignancy and suppresses apoptosis. Treating PLD3-overexpressing gastric cancer cells with Vps34-IN-1-a potent inhibitor of autophagy key regulator Vps34-significantly inhibits PLD3-driven proliferation and promotes apoptosis.
Conclusions:
PLD3 exhibits markedly elevated expression in gastric cancer tissues, thus serving as a highly promising novel biomarker for prognostic assessment of this malignancy.
Insights
Phospholipase D family member 3 (PLD3) is overexpressed in gastric cancer, correlating with poor survival. Inhibiting autophagy in PLD3-overexpressing cells reduces proliferation and promotes apoptosis, suggesting PLD3 as a prognostic biomarker.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Phospholipase D family member 3 (PLD3) is a transmembrane glycoprotein involved in cellular processes like nucleic acid turnover and immune signaling.
- While PLD3's general functions are known, its specific role in gastric cancer development remains unclear.
Purpose of the Study:
- To investigate the expression, prognostic value, and functional role of PLD3 in gastric cancer.
- To explore the mechanistic link between PLD3 and autophagy in gastric tumorigenesis.
Main Methods:
- Analysis of The Cancer Genome Atlas (TCGA) datasets for PLD3 expression and correlation with clinical outcomes.
- Validation of PLD3 expression in gastric cancer tissues and cell lines using RT-qPCR.
- In vitro functional assays to assess the impact of PLD3 modulation on cancer cell behavior and autophagy.
Main Results:
- PLD3 is significantly overexpressed in gastric carcinoma tissues, with higher expression linked to reduced overall patient survival.
- Knockdown of PLD3 suppressed malignant phenotypes, while PLD3 overexpression enhanced malignancy and inhibited apoptosis.
- Inhibition of autophagy using Vps34-IN-1 reversed PLD3-driven proliferation and promoted apoptosis in gastric cancer cells.
Conclusions:
- PLD3 is significantly upregulated in gastric cancer and serves as a promising prognostic biomarker.
- PLD3 influences gastric cancer progression, potentially through its interaction with autophagy pathways.
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