Abstract
Pyrrolizidine alkaloid-induced hepatic sinusoidal obstruction syndrome (PA-HSOS) is a type of hepatic sinusoidal obstruction syndrome mainly caused by the intake of Chinese herbal medicine or food containing pyrrolizidine alkaloids. This article reviews the recent research advances in the mechanism of action of pyrrolizidine alkaloids and their metabolites in disease development and progression from the aspects of drug factors, host factors, and influencing factors. It is pointed out that PA-HSOS has complex pathogenesis and various influencing factors, and some patients tend to have a poor prognosis; its pathogenesis remains unclear and needs further in-depth studies.
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