Precise subcellular organelle-targeted analyses of the hepatotoxicity of rhubarb

Abstract

Objective: Drug-induced liver injury (DILI) is the leading cause of acute liver failure and poses a significant challenge to human health. Rhubarb (Rheum officinale Baill. DaHuang) has been clinically used for its heat-clearing and diuresis-promoting effects. However, its toxic effects on different organelles in the liver require further validation.
Methods: We analyzed the potential targets affecting hepatotoxicity in rhubarb and the potential damage relationship with five major organelles, including microsomes, mitochondria, endoplasmic reticulum (ER), Golgi apparatus (GA), and lysosomes through Integrated Traditional Chinese Medicine (ITCM)/HERB databases and network pharmacology. We isolated and purified different organelles, incubated them with different fractions and monomers of rhubarb in an adenosine triphosphate (ATP) culture system and examined the structural and functional changes in the organelles using particle size analysis and molecular biological experiments to investigate whether rhubarb affects the damage and rupture of major organelles in the liver.
Results: By combining virtual predictions and experimental verification, our research confirmed that emodin isolated from the anthraquinone of rhubarb, catechin in the tannins of rhubarb, and palmitic acid in the organic acids of rhubarb caused the most significant functional and structural damage to the representative organelles. Among all the monomeric compounds, emodin caused the most damage to the microsome, mitochondria, ER, and lysosome; catechin induced microsome and GA damage; and palmitic acid caused the most damage to microsomes and GA in the liver, suggesting that rhubarb components may exert hepatotoxicity through multi-organelle injury.
Conclusions: Our findings revealed that rhubarb has varying degrees of damaging effects on different organelles, which in turn affects cellular life activities by impairing organelle morphology and function. This study provides a theoretical basis and technical support for a refined analysis of the toxic components and targets of rhubarb.

Keywords

DILI / Emodin / Organelle toxicology / Palmitic acid / Rhubarb

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