6-O-trans-feruloyl Catalpol, a Natural Antioxidant from the Stem Bark of Catalpa ovata, Accelerates Liver Regeneration In Vivo via Activation of Hepatocyte Proliferation Signaling Pathways.

BACKGROUND: Liver regeneration is a complex process involving multiple signaling pathways that coordinate hepatocyte proliferation, survival, and tissue repair. Natural compounds like silymarin, ursolic acid, quercetin, and resveratrol have shown regenerative potential, though their precise molecular mechanisms remain unclear. 6-O-trans-feruloyl catalpol (6FC), a major bioactive compound from Catalpa ovata, exhibits anti-inflammatory and potential antioxidant effects via regulation of NF-κB signaling and redox-sensitive pathways such as Akt and MAPK, which are critical for cell survival and proliferation. Moreover, 6FC exhibits peroxynitrite-scavenging activity, suggesting its potential antioxidant properties that may protect hepatocytes from oxidative damage during regeneration. However, the role of 6FC in liver regeneration has not been elucidated, positioning it as a promising natural therapeutic candidate for hepatic repair. PURPOSE: This study aimed to determine whether 6FC promotes hepatocyte proliferation and liver regeneration in vivo using a 2/3 PHx mouse model, and to validate its proliferative effects in vitro with HGF-stimulated Hep3B cells. METHODS: A 2/3 PHx liver regeneration model was used to evaluate 6FC-mediated liver regeneration. Histological and molecular analyses assessed hepatocyte proliferation and signaling activation. HGF-stimulated Hep3B cells were also used to examine 6FC proliferative effects in vitro. RESULTS: 6FC significantly promoted liver regeneration by restoring the liver-to-body weight ratio and reducing serum ALT and AST levels without inducing excessive immune responses. Mechanistic studies revealed that 6FC activates Akt and MAPK pathways, increases the expression of critical growth factors, and upregulates cell cycle regulators. These effects were also observed in HGF-stimulated Hep3B cells, suggesting that 6FC may enhance hepatocyte proliferation without triggering excessive immune responses. CONCLUSIONS: 6FC accelerates hepatocyte proliferation and promotes liver regeneration by activating key redox-sensitive signaling pathways, highlighting its potential as a natural antioxidant-based therapeutic agent.