AS3MT facilitates NLRP3 inflammasome activation by m6A modification during arsenic-induced hepatic insulin resistance

N6-methyladenosine (m 6 A) messenger RNA methylation is the most widespread gene regulatory mechanism affecting liver functions and disorders. However, the relationship between m6A methylation and arsenic-induced hepatic insulin resistance (IR), which is a critical initiating event in arsenic-induce...

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Published in:Cell biology and toxicology 2023-10, Vol.39 (5), p.2165-2181
Main Authors: Qiu, Tianming, Wu, Chenbing, Yao, Xiaofeng, Han, Qiuyue, Wang, Ningning, Yuan, Weizhuo, Zhang, Jingyuan, Shi, Yan, Jiang, Liping, Liu, Xiaofang, Yang, Guang, Sun, Xiance
Format: Article
Language:English
Subjects:
Arsenic
Arsenite
Arsenite methyltransferase
Bioaccumulation
Biochemistry
Biomedical and Life Sciences
Cell Biology
Diabetes mellitus (non-insulin dependent)
DNA methylation
Fatty liver
Inflammasomes
Insulin
Insulin resistance
Life Sciences
Liver
Liver diseases
Metabolic disorders
Metabolic syndrome
Metabolism
Methylase
Methylation
mRNA stability
N6-methyladenosine
Original
Original Article
Pharmacology/Toxicology
Post-transcription
Regulatory mechanisms (biology)
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Summary:N6-methyladenosine (m 6 A) messenger RNA methylation is the most widespread gene regulatory mechanism affecting liver functions and disorders. However, the relationship between m6A methylation and arsenic-induced hepatic insulin resistance (IR), which is a critical initiating event in arsenic-induced metabolic syndromes such as type 2 diabetes (T2D) and non-alcoholic fatty liver disease (NAFLD), remains unclear. Here, we showed that arsenic treatment facilitated methyltransferase-like 14 (METTL14)-mediated m6A methylation, and that METTL14 interference reversed arsenic-impaired hepatic insulin sensitivity. We previously showed that arsenic-induced NOD-like receptor protein 3 (NLRP3) inflammasome activation contributed to hepatic IR. However, the regulatory mechanisms underlying the role of arsenic toward the post-transcriptional modification of NLRP3 remain unclear. Here, we showed that NLRP3 mRNA stability was enhanced by METTL14-mediated m6A methylation during arsenic-induced hepatic IR. Furthermore, we demonstrated that arsenite methyltransferase (AS3MT), an essential enzyme in arsenic metabolic processes, interacted with NLRP3 to activate the inflammasome, thereby contributing to arsenic-induced hepatic IR. Also, AS3MT strengthened the m6A methylase association with NLRP3 to stabilize m6A-modified NLRP3. In summary, we showed that AS3MT-induced m 6 A modification critically regulated NLRP3 inflammasome activation during arsenic-induced hepatic IR, and we identified a novel post-transcriptional function of AS3MT in promoting arsenicosis. Graphical abstract
ISSN:0742-2091
1573-6822
DOI:10.1007/s10565-022-09703-7