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Ref Type Journal Article
PMID (30796032)
Authors Zhang Q, Zhang Y, Chen Y, Qian J, Zhang X, Yu K
Title A Novel mTORC1/2 Inhibitor (MTI-31) Inhibits Tumor Growth, Epithelial-Mesenchymal Transition, Metastases, and Improves Antitumor Immunity in Preclinical Models of Lung Cancer.
Abstract Text We aimed to investigate efficacy and mechanism of MTI-31 (LXI-15029), a novel mTORC1/mTORC2 inhibitor currently in human trial (NCT03125746), in non-small cell lung cancer (NSCLC) models of multiple driver mutations and tyrosine kinase inhibitor (TKI)-resistance.Gene depletion, inhibitor treatment, immunological, flow cytometry, cellular, and animal studies were performed to determine in vitro and in vivo efficacy in NSCLC models of driver mutations and elucidate roles by mTOR complexes in regulating migration, epithelial-mesenchymal transition (EMT), metastasis, intracranial tumor growth, and immune-escape.MTI-31 potently inhibited cell proliferation (IC50 <1 μmol/L) and in vivo tumor growth in multiple NSCLC models of EGFR/T790M, EML4-ALK, c-Met, or KRAS (MED <10 mg/kg). In EGFR-mutant and/or EML4-ALK-driven NSCLC, MTI-31 or disruption of mTORC2 reduced cell migration, hematogenous metastasis to the lung, and abrogated morphological and functional traits of EMT. Disruption of mTORC2 inhibited EGFR/T790M-positive tumor growth in mouse brain and prolonged animal survival correlating a diminished tumor angiogenesis and recruitment of IBA1+ microglia/macrophages in tumor microenvironment. MTI-31 also suppressed programmed death ligand 1 (PD-L1) in EGFR- and ALK-driven NSCLC, mediated in part by mTORC2/AKT/GSK3β-dependent proteasomal degradation. Depletion of mTOR protein or disruption of mTOR complexes profoundly downregulated PD-L1 and alleviated apoptosis in Jurkat T and primary human T cells in a tumor-T cell coculture system.Our results highlight mTOR as a multifaceted regulator of tumor growth, metastasis, and immune-escape in EGFR/ALK-mutant and TKI-resistant NSCLC cells. The newly characterized mechanisms mediated by the rapamycin-resistant mTORC2 warrant clinical investigation of mTORC1/mTORC2 inhibitors in patients with lung cancer.


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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
MTI-31 MTI-31 1 0
Drug Name Trade Name Synonyms Drug Classes Drug Description
MTI-31 LXI-15029|LXI15029|SCC-31 mTOR Inhibitor 51 MTI-31 (LXI-15029) inhibits mTORC1/2, potentially resulting in decreased tumor cell proliferation and tumor growth (PMID: 30796032).
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
EML4 - ALK lung non-small cell carcinoma sensitive MTI-31 Preclinical - Cell line xenograft Actionable In a preclinical study, MTI-31 inhibited proliferation and migration and increased PD-L1 degradation in a non-small cell lung cancer cell line harboring EML4-ALK in culture, and inhibited tumor growth in xenograft models (PMID: 30796032). 30796032