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Crosstalk between microRNA-122 and FOX family genes in HepG2 cells
Subodh Kumar1, Ankita Batra1, Shruthi Kanthaje1
1Department of Experimental Medicine and Biotechnology, Postgraduate Institute of Medical Education and Research, Chandigarh 160012, India.
Abstract:
MicroRNA-122 (miR-122) is liver specific and plays an important role in physiology as well as diseases including hepatocellular carcinoma (HCC). Downregulation of miR-122 in HCC modulates apoptosis. Similarly, the putative targets of miR-122, the forkhead box (FOX) family genes also play an important role in the regulation of apoptosis. Hence, an interplay between miR-122 and FOX family genes has been explored in this study. Initially, an augmentation of apoptosis was noticed in HepG2 cells after transfection with miR-122. Further, the predicted miR-122 targets, the FOX family genes ( FOXM1b, FOXP1, and FOXO4) were selected via in silico analysis based on their role in apoptosis. We checked the expression of all these genes at transcript level after the transfection of miR-122 and found that the relative expression of FOXP1 and FOXM1b was significantly downregulated (p < 0.005) and that of FOXO4 was upregulated (p < 0.005). Thus, the finding indicates deregulation of these FOX genes as a result of miR-122 augmentation might be involved in the modulation of apoptosis.
Insights
MicroRNA-122 (miR-122) augmentation increases apoptosis in liver cancer cells. This involves the altered expression of key forkhead box (FOX) genes, suggesting a novel therapeutic target for hepatocellular carcinoma (HCC).
Area of Science:
- Molecular Biology
- Hepatology
- Cancer Research
Background:
- MicroRNA-122 (miR-122) is a liver-specific microRNA crucial for normal liver function and implicated in hepatocellular carcinoma (HCC).
- Downregulation of miR-122 in HCC is linked to altered apoptosis, a key process in cancer development.
- Forkhead box (FOX) family genes are known regulators of apoptosis and potential targets of miR-122.
Purpose of the Study:
- To investigate the interplay between miR-122 and its target FOX family genes (FOXM1b, FOXP1, FOXO4) in the context of apoptosis.
- To determine the effect of miR-122 augmentation on apoptosis and the expression of selected FOX genes in HCC cells.
Main Methods:
- Transfection of HepG2 cells with miR-122 to augment its expression.
- In silico analysis to identify miR-122 targets involved in apoptosis.
- Quantitative analysis of FOXM1b, FOXP1, and FOXO4 gene expression at the transcript level post-transfection.
Main Results:
- Transfection with miR-122 led to increased apoptosis in HepG2 cells.
- FOXP1 and FOXM1b gene expression were significantly downregulated following miR-122 augmentation (p < 0.005).
- FOXO4 gene expression was significantly upregulated following miR-122 augmentation (p < 0.005).
Conclusions:
- Augmentation of miR-122 in liver cancer cells modulates apoptosis.
- Deregulation of FOXM1b, FOXP1, and FOXO4 gene expression by miR-122 contributes to apoptosis modulation in HCC.
- These findings suggest a potential therapeutic strategy targeting the miR-122/FOX gene axis in hepatocellular carcinoma.
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