[Effects of activation of mitochondrial aldehyde dehydrogenase 2 on inflammasome production in high glucose induced A549 cells].

A new interesting article has been published in Wei Sheng Yan Jiu. 2019 May;48(3):458-467. English and titled:

[Effects of activation of mitochondrial aldehyde dehydrogenase 2 on inflammasome production in high glucose induced A549 cells].

Authors of this article are:

Wang W, Cao R, Lin X, Liu X, Xu H, Huang L, Hu J.

A summary of the article is shown below:

OBJECTIVE: To investigate the effects of activation of mitochondrial aldehyde dehydrogenase 2(ALDH2) on high glucose-induced inflammasome production in alveolar epithelial A549 cells.METHODS: The alveolar epithelial A549 cells were cultured with 25 mmol/L high glucose complete medium and divided into 4 groups: Control group, ALDH2 agonist 20 μmol/L Alda-1 group, ALDH2 antagonist 60 μmol/L Daidzin group, 20 μmol/L Alda-1 + 60 μmol/L Daidzin group. After the cells treated for 24 h, the cell proliferation activity was measured by thiazolyl blue tetrazolium bromide(MTT) colorimetric assaymethod, and the cellular reactive oxygen species(ROS) level were detected by dihydroethidium(DHE) fluorescent staining method, the cell migration ability was performed by cell scratching experiments, the protein expressions of ALDH2 and the core components of inflammasome, nucleotide-binding oligomerization domain-like receptor protein 3(NLRP3), apoptosis-associated speck-like protein containing CARD(ASC) and cysteinyl aspartate specific protease-1(caspase-1) were detected by western blot.RESULTS: Compared with the control group, after Alda-1 activated ALDH2 specifically, the cell proliferation activity did not change significantly, but the oxidative stress level and cell migration rate were significantly decreased(P<0.05). ALDH2 protein expression was significantly increased(P<0.05), the protein expressions of NLRP3, ASC and caspase-1 were significantly decreased(P<0.05). After Daidzin blocked ALDH2 specifically, there were no significant changes in cell proliferation, oxidative stress, cell migration rate, ALDH2 and ASC protein expressions, while NLRP3 protein expression was significantly increased(P<0.05), and caspase-1 protein expression was significantly decreased(P<0.05). Compared with Alda-1 group, there was no significant changes in cell proliferation and oxidative stress in Alda-1+Daidzin group, cell migration rate was significantly increased(P<0.05), ALDH2 protein expression was decreased(P<0.05), and the protein expressions of NLRP3, ASC and caspase-1 were significantly increased(P<0.05).CONCLUSION: Increasing ALDH2 expression in alveolar epithelial A549 cells may attenuate high glucose-induced cellular inflammatory reaction, possibly through reducing cellular ROS level and reducing inflammasome expression.
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This article is a good source of information and a good way to become familiar with topics such as: A549 cells; high glucose; inflammasome; mitochondrial aldehyde dehydrogenase 2.