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Long non-coding RNA HIF1A-As2 and MYC form a double-positive feedback loop to promote cell proliferation and metastasis in KRAS-driven non-small cell lung cancer

Lung cancer is the leading cause of cancer-related deaths worldwide. KRAS is the main oncogenic driver in lung cancer that can be activated by gene mutation or amplification, but whether long non-coding RNAs (lncRNAs) regulate its activation remains unknown. Through gain and loss of function approaches, we identified that lncRNA HIF1A-As2, a KRAS-induced lncRNA, is required for cell proliferation, epithelial-mesenchymal transition (EMT) and tumor propagation in non-small cell lung cancer (NSCLC) in vitro and in vivo. Integrative analysis of HIF1A-As2 transcriptomic profiling reveals that HIF1A-As2 modulates gene expression in trans, particularly regulating transcriptional factor genes including MYC. Mechanistically, HIF1A-As2 epigenetically activates MYC by recruiting DHX9 on MYC promoter, consequently stimulating the transcription of MYC and its target genes. In addition, KRAS promotes HIF1A-As2 expression via the induction of MYC, suggesting HIF1A-As2 and MYC form a double-regulatory loop to strengthen cell proliferation and tumor metastasis in lung cancer. Inhibition of HIF1A-As2 by LNA GapmeR antisense oligonucleotides (ASO) significantly improves sensitization to 10058-F4 (a MYC-specific inhibitor) and cisplatin treatment in PDX and KRASLSLG12D-driven lung tumors, respectively.

 

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This passage describes a study that investigates the role of a long non-coding RNA (lncRNA), HIF1A-As2, in regulating the activation of KRAS, the main oncogenic driver in lung cancer. The study uses gain and loss of function approaches to demonstrate that HIF1A-As2 is required for cell proliferation, epithelial-mesenchymal transition (EMT), and tumor propagation in non-small cell lung cancer (NSCLC) both in vitro and in vivo.

The study also reveals that HIF1A-As2 modulates gene expression in trans, particularly regulating transcriptional factor genes, including MYC. Mechanistically, HIF1A-As2 epigenetically activates MYC by recruiting DHX9 on MYC promoter, consequently stimulating the transcription of MYC and its target genes. Furthermore, KRAS promotes HIF1A-As2 expression via the induction of MYC, suggesting that HIF1A-As2 and MYC form a double-regulatory loop to strengthen cell proliferation and tumor metastasis in lung cancer.

The study suggests that inhibition of HIF1A-As2 by LNA GapmeR antisense oligonucleotides (ASO) significantly improves sensitization to 10058-F4, a MYC-specific inhibitor, and cisplatin treatment in patient-derived xenografts (PDX) and KRASLSLG12D-driven lung tumors, respectively. These findings have implications for developing targeted therapies for lung cancer patients with KRAS mutations.

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S7153 10058-F4 10058-F4 is a c-Myc inhibitor that specificallly inhibits the c-Myc-Max interaction and prevents transactivation of c-Myc target gene expression. 10058-F4 promotes a caspase-3-dependent apoptosis and modulates autophagy.

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