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A novel lncRNA FUAT1/TNS4 axis confers chemoresistance by suppressing ROS-mediated apoptosis in gastric cancer

ABSTRACT: A novel lncRNA FUAT1/TNS4 axis confers chemoresistance by suppressing ROS-mediated apoptosis in gastric cancer

PROVIDER: PRJNA993250 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25223210_1.fastq.gz	Fastqsanger.gz
	SRR25223210_2.fastq.gz	Fastqsanger.gz
	SRR25223211_1.fastq.gz	Fastqsanger.gz
	SRR25223211_2.fastq.gz	Fastqsanger.gz
	SRR25223212_1.fastq.gz	Fastqsanger.gz

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A novel lncRNA FUAT1/TNS4 axis confers chemoresistance by suppressing ROS-mediated apoptosis in gastric cancer

Project description:Reactive oxygen species (ROS) play a vital role in conveying the cytotoxicity and resistance of most chemo-drugs. Thus, a better understanding of the detailed activities against oxidative stress in cancer cells may provide novel insights into the discovery of common mechanisms underlying chemoresistance. In this study, taking advantage of a customized screening strategy based on transcriptome sequencing (RNA-Seq) technology, we identified a novel lncRNA, designated FUAT1, as a key non-genetic player that participates in ROS-mediated intrinsic chemoresistance in gastric cancer (GC) cells. The role of the FUAT1 regulatory axis in chemoresistance was further explored by using a series of in vitro and in vivo assays, including gain/loss-of-function and rescue experiments. Mechanistically, FUAT1 could upregulate TNS4 by sponging miR-140-5p, allowing GC cells to survive upon chemotherapy via inhibition of ROS-mediated apoptosis. Clinically, the FUAT1/TNS4 regulatory axis is negatively associated with overall and progression-free survival in gastric and colon cancer patients treated with 5-FU adjuvant chemotherapy. Our findings touch on a fundamental adaptive mechanism for the survival of cancer cells upon chemotherapy, providing a novel insight into the development of strategies to overcome chemoresistance.

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SIRT3 SUMOylation confers AML chemoresistance via down-regulation of HES1 dependent fatty acid oxidation

Project description:SIRT3 deacetylase is a critical mitochondrial regulator for mitochondrial metabolism reprogramming and ROS production, and is involved in the regulation of chemoresistance in AML. SIRT3 is a SUMOylated protein, with de-SUMOylation by SENP1, resulted in enhancement of its deacetylase activity. However, the molecular mechanism of de-SUMOylation mediated SIRT3 activation, which may lead to reinforced AML chemoresistance, remains poorly understood. In the current study, we demonstrated that SIRT3 SUMOylation was attenuated by cytarabine, and de-SUMOylation prevented SIRT3 from proteasome degradation. SIRT3 de-SUMOylation was capable of reprogramming mitochondrial biogenesis, and subsequently inhibited mitochondrial ROS production. Furthermore, RNA-seq revealed that expression of a collection of genes was altered by SIRT3 de-SUMOylation, among which the transcription factor HES1, a downstream substrates of Notch1 signaling pathway, was significantly downregulated by SIRT3K288R, the de-SUMOylated and constitutively active mutant of SIRT3. HES1-dependent FAO was inhibited by SIRT3 de-SUMOylation. Moreover, cytarabine synergized with the SENP1 inhibitor momodrin-Ic to eradicate AML blasts in vitro and in xenografts mice models. In summary, the current study revealed a novel role of SIRT3 SUMOylation in regulating chemoresistance in AML via HES1-dependent FAO, which may provide a rationale for SIRT3 SUMOylation-targeted intervention to improve the chemotherapies in AML.

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