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Redd1 inhibits the invasiveness of non-small cell lung cancer cells
Hyeon-Ok Jin1, Sung-Keum Seo, Sang-Hyeok Woo
1Division of Radiation Cancer Research, Korea Institute of Radiological & Medical Sciences, 215-4 Gongneung-dong, Nowon-gu, Seoul 139-706, Republic of Korea. hyeonok@kirams.re.kr
Abstract:
Redd1 acts as a negative regulator of mTOR in response to various stress conditions, but its specific physiological role is currently unclear. In the present study, we showed that Redd1 inhibits the invasive activity of non-small cell lung cancer (NSCLC) cells. Interestingly, expression of Redd1 was extremely low in H1299 cells displaying high invasiveness, compared with that in H460 cells with lower invasive activity. Overexpression of Redd1 inhibited the invasive activity of H1299 cells, while suppression with specific siRNAs enhanced the invasiveness of H460 cells. Knockdown of the mTOR downstream substrate, S6K, resulted in a decrease in the invasive property of H1299 cells. Our results provide preliminary evidence that Redd1 inhibits the invasive activity of NSCLC cells via suppression of the mTOR downstream pathway.
Insights
The study reveals that Redd1 suppresses non-small cell lung cancer (NSCLC) cell invasion by inhibiting the mTOR pathway. Redd1
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Redd1 is a known negative regulator of mTOR signaling under stress.
- The precise physiological function of Redd1, particularly in cancer, remains largely undefined.
- Understanding Redd1's role could offer new therapeutic strategies for lung cancer.
Purpose of the Study:
- To investigate the role of Redd1 in the invasive behavior of non-small cell lung cancer (NSCLC) cells.
- To elucidate the molecular mechanisms by which Redd1 influences cancer cell invasiveness.
- To determine the involvement of the mTOR pathway in Redd1-mediated effects on NSCLC.
Main Methods:
- Analysis of Redd1 expression levels in NSCLC cell lines with varying invasive potentials (H1299 vs. H460).
- Experimental manipulation of Redd1 levels through overexpression and siRNA-mediated knockdown.
- Assessment of cell invasive activity following genetic modifications.
- Investigation of the mTOR downstream pathway, including knockdown of S6K.
Main Results:
- Redd1 expression was inversely correlated with the invasive capacity of NSCLC cells.
- Overexpression of Redd1 significantly reduced H1299 cell invasiveness.
- siRNA-mediated suppression of Redd1 increased the invasiveness of H460 cells.
- Knockdown of S6K, an mTOR downstream target, decreased H1299 cell invasiveness.
Conclusions:
- Redd1 acts as an inhibitor of non-small cell lung cancer cell invasion.
- The inhibitory effect of Redd1 on NSCLC invasiveness is mediated through the suppression of the mTOR downstream pathway.
- These findings suggest Redd1 as a potential therapeutic target for reducing NSCLC metastasis.