Hepatocyte-specific partial cellular reprogramming via selective OSK mRNA lipid nanoparticle attenuates liver fibrosis.
Level 5 - mechanism / opinion, no new human data
Preclinical animal and bench research
PubMed 41443352 · doi:10.1016/j.jconrel.2025.114569
What was done
Researchers developed an ionizable lipid nanoparticle formulation (H4T3_F6), characterized by a three-component, phospholipid-free design, for selective mRNA delivery to hepatocytes. They evaluated the delivery of mRNA encoding partial reprogramming factors Oct4, Sox2, and Klf4 (OSK) in a carbon tetrachloride (CCl4)-induced mouse model of liver fibrosis to assess its effects on cellular reprogramming, gene expression, paracrine signaling, and extracellular matrix deposition.
What was found
The abstract reports no numerical data, effect sizes, or sample counts. Qualitatively, H4T3_F6 showed delivery efficacy comparable to SM102 with enhanced hepatocyte selectivity and minimal immunogenicity. Hepatocyte-targeted delivery of OSK mRNA transiently reprogrammed fibrotic hepatocytes into progenitor-like cells, restored hepatic gene expression, downregulated fibrogenic mediators (*Tgfb1*, *Pdgfb*), interrupted hepatocyte-stellate cell signaling, and halted extracellular matrix deposition.
Why it matters
This provides proof-of-concept for targeted, non-viral mRNA delivery to achieve in vivo partial cellular reprogramming in specific organs, suggesting a potential therapeutic avenue for reversing liver fibrosis and age-related tissue degeneration.
Limits
The study is restricted to a chemically induced (CCl4) rodent model, which does not fully replicate human liver disease etiologies such as viral hepatitis or metabolic dysfunction-associated steatohepatitis. The abstract provides no quantitative metrics, sample sizes, durability data, or long-term safety evaluations concerning potential teratoma formation or off-target dedifferentiation.
Cited by
- supports OSK-based cellular reprogramming has been successfully replicated in monkeys and across various animal tissues beyond the eye.