The HDAC3 inhibitor RGFP966 ameliorated ischemic brain damage by downregulating the AIM2 inflammasome.

Abstract

Histone deacetylases 3 (HDAC3) modulates the acetylation state of histone and non-histone proteins and could be a powerful regulator of the inflammatory process in stroke. Inflammasome activation is a ubiquitous but poorly understood consequence of acute ischemic stroke. Here, we investigated the potential contributions of HDAC3 to inflammasome activation in primary cultured microglia and experimental stroke models. In this study, we documented that HDAC3 expression was increased in microglia of mouse experimental stroke model. Intraperitoneal injection of RGFP966 (a selective inhibitor of HDAC3) decreased infarct size and alleviated neurological deficits after the onset of middle cerebral artery occlusion (MCAO). In vitro data indicated that LPS stimulation evoked a time-dependent increase of HDAC3 and absent in melanoma 2 (AIM2) inflammasome in primary cultured microglia. Interestingly, AIM2 was subjected to spatiotemporal regulation by RGFP966. The ability of RGFP966 to inhibit the AIM2 inflammasome was confirmed in an experimental mouse model of stroke. As expected, AIM2 knockout mice also demonstrated significant resistance to ischemia injury compared with their wild-type littermates. RGFP966 failed to exhibit extra protective effects in AIM2-/- stroke mice. Furthermore, we found that RGFP966 enhanced STAT1 acetylation and subsequently attenuated STAT1 phosphorylation, which may at least partially contributed to the negative regulation of AIM2 by RGFP966. Together, we initially found that RGFP966 alleviated the inflammatory response and protected against ischemic stroke by regulating the AIM2 inflammasome.

• Authors: Mei-Juan Zhang, Qiu-Chen Zhao, Ming-Xu Xia, Jian Chen, Yan-Ting Chen, Xiang Cao, Yi Liu, Zeng-Qiang Yuan, Xiao-Ying Wang, Yun Xu
• Journal: FASEB journal : official publication of the Federation of American Societies for Experimental Biology (FASEB J) Vol. 34 Issue 1 Pg. 648-662 (01 2020) ISSN: 1530-6860 [Electronic] United States
• PMID: 31914678 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2019 The Authors. The FASEB Journal published by Wiley Periodicals, Inc. on behalf of Federation of American Societies for Experimental Biology.

Chemical References

• Acrylamides
• Aim2 protein, mouse
• DNA-Binding Proteins
• Histone Deacetylase Inhibitors
• Inflammasomes
• Phenylenediamines
• RGFP966
• Histone Deacetylases
• histone deacetylase 3

Topics

• Acrylamides (pharmacology)
• Animals
• Brain Ischemia (drug therapy, metabolism)
• DNA-Binding Proteins (drug effects)
• Disease Models, Animal
• Down-Regulation
• Histone Deacetylase Inhibitors (pharmacology)
• Histone Deacetylases (metabolism)
• Inflammasomes (drug effects, metabolism)
• Mice, Knockout
• Phenylenediamines (pharmacology)
• Signal Transduction (drug effects)