Molecular biomedicineSep 16, 2026

Betaine helps protect the liver by boosting cell cleanup and antioxidant defenses through chemical changes

Longevity & Aging Weekly Brief ↗PubMed ↗DOI ↗

Updated Sep 17, 2026

Abstract

Betaine is associated with enhanced Nrf2 activity and improved cellular glutathione levels.

Betaine regulates the interaction between Keap1 and Nrf2 by modifying Keap1 through methylation.
Methylation of Keap1 at specific sites may promote its degradation via p62-dependent autophagy, leading to stabilization of Nrf2.
In cultured liver cells and mice, betaine enhances the expression of genes regulated by Nrf2 and increases cellular glutathione (GSH).
In a model of acetaminophen overdose, betaine reduces liver injury, suggesting improved redox capacity during toxic stress.
In a model of diet-induced fatty liver disease, betaine is linked to reduced signs of inflammation and lipid accumulation.
Analysis of a human cohort with metabolic liver disease indicates that Nrf2-related gene expression patterns correlate with disease severity.

Simplified

Nuclear factor erythroid 2-related factor 2 (Nrf2) coordinates detoxification and antioxidant programs that protect the liver from chemical and metabolic stress. Nrf2 is restrained by Kelch-like ECH-associated protein 1 (Keap1), which can be removed through p62-mediated selective autophagy; however, nutritional cues that engage this pathway remain incompletely understood. This study provides evidence that betaine (trimethylglycine; BET) can regulate the Keap1-Nrf2 axis through modulation of Keap1. In biochemical and cellular assays, betaine was associated with methylation of Keap1 at Cys513 and Cys518 within the Kelch domain, which was linked to enhanced p62-dependent autophagic degradation of Keap1 and Nrf2 stabilization. In AML12 hepatocytes and in mice, betaine enhanced Nrf2 activity, induced canonical Nrf2 target genes, and increased cellular glutathione (GSH), consistent with improved GSH-dependent redox capacity. In an acetaminophen (AAP) overdose model, betaine attenuated hepatic injury, consistent with improved redox capacity under acute toxic stress. In an MCD diet-induced steatotic liver disease model, betaine was associated with reduced steatohepatitis-like histopathology, inflammatory signaling, and lipogenic markers. Finally, RNA-seq analysis of a large human metabolic dysfunction-associated steatotic liver disease (MASLD) cohort revealed Nrf2-related transcriptomic signatures associated with disease severity, providing correlative support for the disease relevance of this pathway. Collectively, these findings suggest that Keap1 cysteine methylation may represent a regulatory node linking betaine to p62-mediated autophagy, Nrf2 stabilization, and GSH homeostasis, while further studies are required to establish the causal and translational relevance of this mechanism in human liver disease.

Betaine helps protect the liver by boosting cell cleanup and antioxidant defenses through chemical changes

Abstract

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