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Systematic identification of a synthetic lethal interaction in brain-metastatic lung adenocarcinoma
Jin Woo Moon1, Beom-Jin Hong2, Seon-Kyu Kim3
1Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea.
Abstract:
Metastatic lung adenocarcinoma (LuAC) presents a significant clinical challenge due to the short latency and the lack of efficient treatment options. Therefore, identification of molecular vulnerabilities in metastatic LuAC holds great importance in the development of therapeutic drugs against this disease. In this study, we performed a genome-wide siRNA screening using poorly and highly brain-metastatic LuAC cell lines. Using this approach, we discovered that compared to poorly metastatic LuAC (LuAC-Par) cells, brain-metastatic LuAC (LuAC-BrM) cells exhibited a significantly higher vulnerability to c-FLIP (an inhibitor of caspase-8)-depletion-induced apoptosis. Furthermore, in vivo studies demonstrated that c-FLIP knockdown specifically inhibited growth of LuAC-BrM, but not the LuAC-Par, tumors, suggesting the addiction of LuAC-BrM to the function of c-FLIP for their survival. Our in vitro and in vivo analyses also demonstrated that LuAC-BrM is more sensitive to c-FLIP-depletion due to ER stress-induced activation of the c-JUN and subsequent induction of stress genes including ATF4 and DDIT3. Finally, we found that c-JUN not only sensitized LuAC-BrM to c-FLIP-depletion-induced cell death but also promoted brain metastasis in vivo, providing strong evidence for c-JUN's function as a double-edged sword in LuAC-BrM. Collectively, our findings not only reveal a novel link between c-JUN, brain metastasis, and c-FLIP addiction in LuAC-BrM but also present an opportunity for potential therapeutic intervention.
Insights
Brain-metastatic lung adenocarcinoma cells are vulnerable to c-FLIP inhibition, unlike poorly metastatic cells. This vulnerability is linked to c-JUN activation and ER stress, offering a potential therapeutic target for brain metastasis.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Metastasis
Background:
- Metastatic lung adenocarcinoma (LuAC) poses a significant clinical challenge due to rapid progression and limited treatment options.
- Identifying molecular vulnerabilities is crucial for developing effective therapies against LuAC, particularly for brain metastases.
Purpose of the Study:
- To identify molecular vulnerabilities in brain-metastatic LuAC (LuAC-BrM) compared to poorly metastatic LuAC (LuAC-Par).
- To investigate the role of c-FLIP and c-JUN in LuAC brain metastasis and potential therapeutic strategies.
Main Methods:
- Genome-wide siRNA screening using poorly and highly brain-metastatic LuAC cell lines.
- In vitro and in vivo studies to assess the impact of c-FLIP and c-JUN modulation on tumor growth and metastasis.
- Analysis of endoplasmic reticulum (ER) stress pathways, including c-JUN, ATF4, and DDIT3.
Main Results:
- Brain-metastatic LuAC cells show significantly higher vulnerability to c-FLIP (caspase-8 inhibitor) depletion-induced apoptosis compared to poorly metastatic cells.
- c-FLIP knockdown specifically inhibited LuAC-BrM tumor growth in vivo, suggesting LuAC-BrM addiction to c-FLIP.
- LuAC-BrM sensitivity to c-FLIP depletion is mediated by ER stress, activating c-JUN and downstream stress genes (ATF4, DDIT3).
- c-JUN promotes LuAC-BrM brain metastasis and sensitizes cells to c-FLIP depletion.
Conclusions:
- A novel link exists between c-JUN, brain metastasis, and c-FLIP addiction in LuAC-BrM.
- c-JUN acts as a double-edged sword, promoting brain metastasis and sensitizing LuAC-BrM to c-FLIP inhibition.
- Targeting c-FLIP or the c-JUN pathway presents a potential therapeutic strategy for LuAC brain metastasis.
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