1. Apabetalone, a BET protein inhibitor, inhibits kidney damage in diabetes by preventing pyroptosis via modulating the P300/H3K27ac/PLK1 axis.
- Author
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Wang M, Huang Z, Li X, He P, Sun H, Peng Y, and Fan Q
- Subjects
- Animals, Humans, Cell Line, Mice, Male, Histones metabolism, NLR Family, Pyrin Domain-Containing 3 Protein metabolism, NLR Family, Pyrin Domain-Containing 3 Protein antagonists & inhibitors, E1A-Associated p300 Protein metabolism, E1A-Associated p300 Protein antagonists & inhibitors, Kidney drug effects, Kidney pathology, Kidney metabolism, Signal Transduction drug effects, Inflammasomes metabolism, Inflammasomes drug effects, Bromodomain Containing Proteins, Nuclear Proteins, Pyroptosis drug effects, Cell Cycle Proteins metabolism, Diabetic Nephropathies drug therapy, Diabetic Nephropathies metabolism, Diabetic Nephropathies pathology, Proto-Oncogene Proteins metabolism, Proto-Oncogene Proteins antagonists & inhibitors, Polo-Like Kinase 1, Protein Serine-Threonine Kinases metabolism, Protein Serine-Threonine Kinases antagonists & inhibitors, Mice, Inbred C57BL, Transcription Factors metabolism
- Abstract
Many inflammatory disorders, including diabetic kidney disease (DKD), are associated with pyroptosis, a type of inflammation-regulated cell death. The purpose of this work was to ascertain the effects of apabetalone, which targets BRD4, a specific inhibitor of the bromodomain (BRD) and extra-terminal (BET) proteins that target bromodomain 2, on kidney injury in DKD. This study utilized pharmacological and genetic approaches to investigate the effects of apabetalone on pyroptosis in db/db mice and human tubular epithelial cells (HK-2). BRD4 levels were elevated in HK-2 cells exposed to high glucose and in db/db mice. Modulating BRD4 levels led to changes in the generation of inflammatory cytokines and cell pyroptosis linked to NLRP3 inflammasome in HK-2 cells and db/db mice. Likewise, these cellular processes were mitigated by apabetalone through inhibition BRD4. Apabetalone or BRD4 siRNA suppressed PLK1 expression in HK-2 cells under high glucose by P300-dependent H3K27 acetylation on the PLK1 gene promoter, as demonstrated through chromatin immunoprecipitation and immunoprecipitation assays. To summarize, apabetalone relieves renal proptosis and fibrosis in DKD. BRD4 regulates the P300/H3K27ac/PLK1 axis, leading to the activation of the NLRP3 inflammasome and subsequent cell pyroptosis, inflammation, and fibrosis. These results may provide new perspectives on DKD treatment., Competing Interests: Declaration of Competing Interest None., (Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2024
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