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An In Vitro Protocol for Evaluating MicroRNA Levels, Functions, and Associated Target Genes in Tumor Cells
Published on: May 21, 2019
miR-208a-3p suppresses cell apoptosis by targeting PDCD4 in gastric cancer
Kai Yin1,2,3, Minghui Liu2, Mei Zhang4
1Department of Gastrointestinal Surgery, Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing, Jiangsu 210008, China.
Abstract:
Programmed cell death 4 (PDCD4) is a novel tumor suppressor gene and a promising target for anticancer therapies. PDCD4 is frequently downregulated in various human cancers; however, the molecular mechanism accounting for the loss expression of PDCD4 in cancers is not fully understood. In this study, we identified specific targeting sites for miR-208a-3p in the 3'-untranslated region (3'-UTR) of the PDCD4 gene which regulated PDCD4 expression. We demonstrated that miR-208a-3p suppressed apoptosis in gastric cancer cells by targeting PDCD4. We also showed that miR-208a-3p promoted the development of tumor growth in xenograft mice by negatively regulating PDCD4. Taken together, this study revealed a critical role for miR-208a-3p as an oncogenic miRNA in gastric carcinogenesis and it may provide a potential novel target for gastric cancer diagnosis and therapy.
Insights
MicroRNA miR-208a-3p promotes gastric cancer by targeting the tumor suppressor gene PDCD4, inhibiting apoptosis and driving tumor growth. This finding offers a potential new target for gastric cancer diagnosis and treatment.
Area of Science:
- Molecular Biology
- Oncology
- Gene Regulation
Background:
- Programmed cell death 4 (PDCD4) is a tumor suppressor frequently downregulated in cancers.
- The mechanisms behind PDCD4 downregulation in cancer remain unclear.
- Understanding these mechanisms is crucial for developing targeted cancer therapies.
Purpose of the Study:
- To investigate the role of miR-208a-3p in regulating PDCD4 expression.
- To determine the impact of miR-208a-3p on gastric cancer cell apoptosis and tumor growth.
- To explore miR-208a-3p as a potential diagnostic and therapeutic target for gastric cancer.
Main Methods:
- Bioinformatic analysis to identify miR-208a-3p targeting sites in the PDCD4 3'-UTR.
- In vitro experiments assessing apoptosis in gastric cancer cells.
- In vivo studies using xenograft mouse models to evaluate tumor growth.
Main Results:
- miR-208a-3p directly targets the PDCD4 gene's 3'-untranslated region.
- miR-208a-3p suppresses apoptosis in gastric cancer cells by downregulating PDCD4.
- miR-208a-3p promotes tumor growth in vivo through negative regulation of PDCD4.
Conclusions:
- miR-208a-3p acts as an oncogenic microRNA in gastric carcinogenesis.
- The miR-208a-3p/PDCD4 axis is a critical regulator of gastric cancer progression.
- Targeting miR-208a-3p presents a promising strategy for gastric cancer therapy.
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