[HTML][HTML] Fra-1 is upregulated in lung cancer tissues and inhibits the apoptosis of lung cancer cells by the P53 signaling pathway

G Zhong, X Chen, X Fang, D Wang… - Oncology …, 2016 - spandidos-publications.com
G Zhong, X Chen, X Fang, D Wang, M Xie, Q Chen
Oncology reports, 2016spandidos-publications.com
Abstract Fos-related antigen-1 (Fra-1) is a member of the activator protein-1 transcription
factor superfamily. It plays important roles in oncogenesis in various types of malignancies.
Herein, we investigated the expression of Fra-1 in lung cancer tissues by qPCR,
immunohistochemistry, and western blot technologies. The results showed that Fra-1 was
overexpressed in the lung cancer tissues when compared with the level in the adjacent non‑
cancerous tissues. To explore the possible mechanism of Fra-1 in lung cancer, we …
Abstract
Fos-related antigen-1 (Fra-1) is a member of the activator protein-1 transcription factor superfamily. It plays important roles in oncogenesis in various types of malignancies. Herein, we investigated the expression of Fra-1 in lung cancer tissues by qPCR, immunohistochemistry, and western blot technologies. The results showed that Fra-1 was overexpressed in the lung cancer tissues when compared with the level in the adjacent non‑cancerous tissues. To explore the possible mechanism of Fra-1 in lung cancer, we elucidated the effect of Fra-1 on the apoptosis of lung cancer H460 cells, and found that the rate of cell apoptosis was decreased in the H460/Fra-1 cells compared with the H460 or H460/vector cells. Cell apoptosis is closely related with a reduction in mitochondrial membrane potential (ΔΨm) and an increase in intracellular reactive oxygen species (ROS) and calcium ion (Ca2+) concentrations. Our results showed that overexpression of Fra-1 in the lung cancer H460 cells, led to an increase in ΔΨm and and a decrease in intracellular ROS and Ca2+ concentrations. Furthermore, we found that Fra-1 was correlated with dysregulation of the P53 signaling pathway in lung cancer tissues in vitro. At the same time, we found that Fra-1 overexpression affected the expression of MDM2 and P53 in vivo. In summary, our results suggest that Fra-1 is upregulated in lung cancer tissues and functions by affecting the P53 signaling pathway in lung cancer.
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