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                                                          4. The HDAC9 risk locus controls inflammasome activation in atherosclerosis
                                                          News | 30.01.2025 | Research Spotlight

                                                          The HDAC9 risk locus controls inflammasome activation in atherosclerosis

                                                          Common genetic variants in a cis-regulatory element of the HDAC9 gene are linked to atherosclerotic conditions, such as stroke and myocardial infarction. Researchers have identified a mechanism by which HDAC9 regulates the activation of the NLRP3 inflammasome and have developed a targeted anti-inflammatory approach for treating atherosclerosis.

                                                          This is a summary of Asare, Yaw et al. (2025). A cis-regulatory element controls expression of histone deacetylase 9 to fine-tune inflammasome-dependent chronic inflammation in atherosclerosis as published in Immunity.  doi.org/10.1016/j.immuni.2025.01.003


                                                          The challenge

                                                          Despite the success of lipid-lowering therapies and other measures to reduce the complications of atherosclerosis, cardiovascular disease continues to be the leading cause of death globally. Genome-wide association studies by us and other have shown that common genetic variants in a cis-regulatory element (CRE) at histone deacetylase (HDAC)9 are a major risk factor for cardiovascular disease. We, therefore, investigated how HDAC9 contributes to vascular inflammation, specifically examining the effects of CRE-driven HDAC9 expression on atherosclerosis.


                                                          Our approach

                                                          We utilized mouse models of atherosclerosis to investigate the mechanisms that connect genetic risk variants at HDAC9 to chronic vascular inflammation. We used mice with a deletion of the conserved (CRE) and crossbred them with Apoe−/− mice. We then assessed the effects on both spontaneous and diet-induced atherosclerosis.


                                                          Our findings

                                                          We discovered that HDAC9 directly interacts with the inflammasome, playing a crucial role in regulating chronic inflammation in atherosclerosis. Our research showed that deleting the conserved non-coding CRE 3' at HDAC9 led to an increase in Hdac9 expression in myeloid cells, which worsened atherosclerosis. Additionally, Hdac9 was found to bind to and mediate the deacetylation of the protein NLRP3, triggering inflammasome activation and pyroptotic cell death. Ultimately, both genetic and pharmacological inhibition of HDAC9 in myeloid cells stabilized atherosclerotic plaques by reducing the expansion of the necrotic core.


                                                          The implications

                                                          Our findings offer a blueprint for future precision medicine strategies that target individual HDACs and specific cell populations, while preserving the potentially protective effects of HDAC9. This paves the way for a new category of immuno-therapeutics aimed at treating vascular disease. Our approach could be extended to other conditions, given the central role of chronic inflammation in the pathogenesis of a wide range of diseases and the need for targeted anti-inflammatory therapies


                                                          Creating SyNergies

                                                          The study was led by SyNergy member Martin Dichgans and included our members Arthur Liesz, Christian Weber, Wolfgang Wurst,and Jürgen Bernhagen. We are pursuing HDAC9 as a therapeutic target via SyNergy’s pipeline for clinical translation. 

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                                                          SyNergy wird von der Deutschen Forschungsgemeinschaft im Rahmen der deutschen Exzellenzstrategie gefördert (EXC 2145 SyNergy - ID 390857198). Die Exzellenzstrategie fördert herausragende Forschung an deutschen Universitäten. 

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