Water Extract of Rice False Smut Balls Activates Nrf2/HO-1 and Apoptosis Pathways, Causing Liver Injury
Received date: 2022-12-06
Accepted date: 2023-04-23
Online published: 2023-05-09
Ustiloxins are vital cyclopeptide mycotoxins originally isolated from rice false smut balls that form in rice spikelets infected by the fungal pathogen Ustilaginoidea virens. The toxicity of the water extract of rice false smut balls (RBWE) remains to be investigated. Studies have shown that RBWE may be toxic to animals, but toxicological evidence is still lacking. In this study, we found that the IC50 values of RBWE to BNL CL.2 cells at 24 and 48 h were 40.02 and 30.11 μg/mL, respectively, with positive correlations with dose toxicity and time toxicity. After treatment with RBWE, the number of BNL CL.2 cells decreased significantly, and the morphology of BNL CL.2 cells showed atrophy and wall detachment. RBWE induced DNA presynthesis phase arrest of BNL CL.2 cells, increased the proportion of apoptotic cells and inhibited cell proliferation. RBWE up-regulated reactive oxygen species (ROS) levels and lowered mitochondrial membrane potentials. Additionally, Western blot and qRT-PCR results suggested that RBWE exerted the above effects by promoting the Nrf2/HO-1 and caspase-induced apoptosis pathways in vitro and in vivo. The contents of alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, and total bile acids in the serum of mice from Institute of Cancer were significantly up-regulated by RBWE. At the same time, RBWE can lead to increases in ROS and malondialdehyde contents, decreases in contents of oxidized glutathione, glutathione and reduced glutathione, as well as decrease in catalase and superoxide dismutase activities in mouse liver tissues, demonstrating that oxidative stress occurred in mice. Moreover, liver damage was further detected by haematoxylin-eosin staining and electron microscopy to verify the damage to the mice caused by RBWE. In general, RBWE may cause hepatotoxicity in vivo and in vitro via the apoptosis pathway, which provides a reference for hepatotoxicity and its mechanism of action.
Zhang Guomei, Li Han, Liu Shanshan, Zhou Xuming, Lu Mingyang, Tang Liang, Sun Lihua . Water Extract of Rice False Smut Balls Activates Nrf2/HO-1 and Apoptosis Pathways, Causing Liver Injury[J]. Rice Science, 2023 , 30(5) : 473 -485 . DOI: 10.1016/j.rsci.2023.04.003
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