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miR-328 mediates a metabolic shift in colon cancer cells by targeting SLC2A1/GLUT1
S Santasusagna1, I Moreno2, A Navarro1
1Molecular Oncology and Embryology Laboratory, Human Anatomy Unit, School of Medicine, University of Barcelona, IDIBAPS, Barcelona, Spain.
Purpose:
Increasing evidence shows that altered metabolism is a critical hallmark in colon cancer. There is a strong need to explore the molecular mechanisms underlying cancer metabolism. Whether the aberrant expression of microRNAs contributes to cancer metabolism is not fully understood. miR-328 is a putative potential target of SLC2A1, but the regulating mechanism between them remains unknown. We have examined whether miR-328 directly regulates SLC2A1/GLUT1 expression in colon cancer cells.
Methods:
We performed in silico bioinformatic analyses to identify miR-328-mediated molecular pathways and targets. We also performed luciferase assays and western blot analyses in LOVO and SW480 colon cancer cell lines. In addition, we assessed miR-328 expression in 47 paired tumor and normal tissue specimens from resected colon cancer patients.
Results:
Luciferase reporter assays showed that miR-328 directly targeted SLC2A1 3'-untranslated region (UTR), with a significant decrease in luciferase activity in both LOVO and SW480 cell lines. These results were validated by western blot. miR-328 expression was significantly downregulated in tumor tissue compared with paired normal tissue.
Conclusions:
Our results show that miR-328 targets SLC2A1/GLUT1. We suggest that miR-328 may be involved in the orchestration of the Warburg effect in colon cancer cells. Furthermore, miR-328 expression is reduced in colon cancer patients and thus inversely correlates with the classically reported upregulated SLC2A1/GLUT1 expression in tumors.
Insights
MicroRNA-328 directly targets SLC2A1/GLUT1, a key player in colon cancer metabolism. This microRNA is downregulated in colon tumors, suggesting its role in the Warburg effect.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Metabolism
Background:
- Altered cellular metabolism is a hallmark of colon cancer.
- The role of microRNAs in regulating cancer metabolism requires further investigation.
- SLC2A1 (Solute Carrier Family 1, Member 1), also known as GLUT1, is implicated in cancer metabolism.
Purpose of the Study:
- To investigate whether microRNA-328 (miR-328) directly regulates SLC2A1/GLUT1 expression in colon cancer cells.
- To explore the role of miR-328 in colon cancer metabolism.
- To determine the expression levels of miR-328 in colon tumor tissues.
Main Methods:
- In silico bioinformatic analyses to identify miR-328 targets and pathways.
- Luciferase reporter assays and Western blot analyses in LOVO and SW480 colon cancer cell lines.
- Assessment of miR-328 expression in 47 paired colon tumor and normal tissue specimens.
Main Results:
- Luciferase assays confirmed direct targeting of the SLC2A1 3'-untranslated region (UTR) by miR-328, leading to decreased luciferase activity.
- Western blot analysis validated the regulatory effect of miR-328 on SLC2A1/GLUT1 expression.
- miR-328 expression was significantly downregulated in colon tumor tissues compared to adjacent normal tissues.
Conclusions:
- miR-328 directly targets and regulates SLC2A1/GLUT1 expression in colon cancer.
- Downregulation of miR-328 in colon cancer may contribute to the Warburg effect.
- miR-328 represents a potential biomarker and therapeutic target in colon cancer, inversely correlating with SLC2A1/GLUT1 upregulation.
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