- Lung and Thoracic cancer
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Combination of the LARS1 Inhibitor, BC-LI-0186 with a MEK1/2 Inhibitor Enhances the Anti-Tumor Effect in Non–Small Cell Lung Cancer
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Sang Hoon Lee, Eun Young Kim, Jung Min Han, Gyoonhee Han, Yoon Soo Chang
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Cancer Res Treat. 2023;55(3):851-864. Published online March 20, 2023
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DOI: https://doi.org/10.4143/crt.2022.1527
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 Abstract
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- Purpose
The mammalian target of rapamycin complex 1 (mTORC1) regulates cell growth and proliferation by growth factor coordination and amino acid availability. Leucyl-tRNA synthetase 1 (LARS1) senses the intracellular leucine concentration and mediates amino acid-induced activation of mTORC1. Thus, LARS1 inhibition could be useful in cancer treatment. However, the fact that mTORC1 can be stimulated by various growth factors and amino acids suggests that LARS1 inhibition alone has limitations in inhibiting cell growth and proliferation. We investigated the combined effects of BC-LI-0186, a LARS1 inhibitor, and trametinib, an MEK inhibitor, on non–small cell lung cancer (NSCLC).
Materials and Methods
Protein expression and phosphorylation were observed by immunoblotting, and genes differentially expressed between BC-LI-0186–sensitive and –resistant cells were identified by RNA sequencing. The combined effect of the two drugs was inferred from the combination index values and a xenograft model.
Results
LARS1 expression was positively correlated with mTORC1 in NSCLC cell lines. BC-LI-0186 treatment of A549 and H460 cells maintained in media supplemented with fetal bovine serum revealed paradoxical phosphorylation of S6 and activation of mitogen- activated protein kinase (MAPK) signaling. Compared with BC-LI-0186–sensitive cells, –resistant cells showed enrichment of the MAPK gene set. The combination of trametinib and BC-LI-0186 inhibited the phosphorylation of S6, MEK, and extracellular signal-regulated kinase and their synergistic effects were confirmed in a mouse xenograft model.
Conclusion
The combination of BC-LI-0186 and trametinib inhibited the non-canonical mTORC1-activating function of LARS1. Our study demonstrated a new therapeutic approach for NSCLC without targetable driver mutations.
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Citations
Citations to this article as recorded by  - LARS1 is a Prognostic Biomarker and Exhibits a Correlation with Immune Infiltrates in Hepatocellular Carcinoma
Longfei Fan, Zhongqiang Qin, Di Wu, Yunchuan Yang, Yigang Zhang, Bo Xie, Jingyu Qian, Jianzhu Wei, Zhaoying Wang, Peipei Yang, Zhen Qian, Mu Yuan, Ziyi Zhu, Yulin Tan, Yi Tan
International Journal of General Medicine.2024; Volume 17: 2203. CrossRef - Personalizing Therapy Outcomes through Mitogen-Activated Protein Kinase Pathway Inhibition in Non-Small Cell Lung Cancer
Hasan Alsharoh, Paul Chiroi, Ekaterina Isachesku, Radu Andrei Tanasa, Ovidiu-Laurean Pop, Radu Pirlog, Ioana Berindan-Neagoe
Biomedicines.2024; 12(7): 1489. CrossRef - UCHL1 Overexpression Is Related to the Aggressive Phenotype of Non-small Cell Lung Cancer
Chi Young Kim, Eun Hye Lee, Se Hyun Kwak, Sang Hoon Lee, Eun Young Kim, Min Kyoung Park, Yoon Jin Cha, Yoon Soo Chang
Tuberculosis and Respiratory Diseases.2024; 87(4): 494. CrossRef
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