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Hepatic sphingomyelin phosphodiesterase 3 promotes steatohepatitis by disrupting membrane sphingolipid metabolism.

ABSTRACT: Hepatic sphingomyelin phosphodiesterase 3 promotes steatohepatitis by disrupting membrane sphingolipid metabolism.

PROVIDER: PRJNA1209137 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR31962907_1.fastq.gz	Fastqsanger.gz
	SRR31962907_2.fastq.gz	Fastqsanger.gz
	SRR31962908_1.fastq.gz	Fastqsanger.gz
	SRR31962908_2.fastq.gz	Fastqsanger.gz
	SRR31962909_1.fastq.gz	Fastqsanger.gz

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Hepatic sphingomyelin phosphodiesterase 3 promotes steatohepatitis by disrupting membrane sphingolipid metabolism

Project description:Hepatic sphingomyelin phosphodiesterase 3 promotes steatohepatitis by disrupting membrane sphingolipid metabolism

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Hepatic sphingomyelin phosphodiesterase 3 promotes steatohepatitis by disrupting membrane sphingolipid metabolism

Project description:Metabolic dysfunction-associated steatohepatitis (MASH) remains a significant health challenge. Herein, we identify sphingomyelin phosphodiesterase 3 (SMPD3) as a key driver of hepatic ceramide accumulation through increasing sphingomyelin hydrolysis at the cell membrane. Hepatocyte-specific Smpd3 gene disruption and pharmacological inhibition of SMPD3 alleviate MASH, whereas reintroducing SMPD3 reverses the resolution of MASH. While healthy livers express low-level SMPD3, lipotoxicity-induced DNA damage suppresses SIRT1, triggering an upregulation of SMPD3 during MASH. This disrupts membrane sphingomyelin-ceramide balance and promotes MASH progression by enhancing caveolae-dependent lipid uptake in hepatocytes and extracellular vesicle secretion from steatotic hepatocytes to worsen inflammation and fibrosis. Thus, SMPD3 acts as a central hub integrating key MASH hallmarks. Notably, we discovered a bifunctional agent that simultaneously activates SIRT1 and inhibits SMPD3, which shows significant therapeutic potential in MASH treatment. These findings suggest that inhibition of hepatic SMPD3 restores membrane sphingolipid balance and holds great promise for developing novel MASH therapies.

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