These conditions often occur simultaneously and significantly aggravate human health by affecting quality of life as well as lifespan. Epigenetic modifications defined as heritable changes in gene activity that do not affect DNA sequence may significantly derail transcriptional programs implicated in oxidative stress, inflammation, senescence, defective stem cell functionality, and metabolic alterations, thus fostering maladaptive pathways and premature CVD. Epigenetic signatures may be classified into three main categories: (1) DNA methylation, (2) posttranslational histone modifications, and (3) RNA-based mechanisms including microRNAs and long non-coding RNAs. The complex interplay between these epigenetic signals may provide a molecular framework through which the environment can interact with the genome to alter gene expression and thereby influence cardiovascular homeostasis.
Figure 1. Environmental factors and epigenetics. Over time, an array of environmental factors significantly contributes to build our individual epigenetic background that includes DNA methylation changes, post-translational histone modifications and altered expression of non-coding RNAs. Epigenetic processing takes center stage in several cardiovascular disease, namely cardiac remodeling and heart failure with preserved ejection fraction (HFpEF). Adapted from CostantinoPaneni, Eur Heart J 2019 (left panel) and Hadmani..Paneni, Eur Heart J 2021 (right panel).
We and others have previously shown that epigenetic signatures may be reversible, thus offering exciting opportunities to alter the trajectory of age and diabetes-related CVD. Indeed, plastic epigenetic changes are amenable to pharmacological intervention. Several specific compounds (e.g. BET protein inhibitors) that target enzymes responsible for epigenetic changes [i.e. histone deacetylase (HDAC) and histone acetyltransferase (HATs) inhibitors] have been developed and are in the clinic or in clinical trials to be tested for several age-related and CV diseases (Fig. 2).
Figure 2. BET protein inhibition resets the endothelial transcriptome. Left panel: Heat map showing differential expression of senescence and inflammatory genes in NG- and HG-treated HAECs, in the presence of RVX-208 (APA, 20 uM) or vehicle (DMSO); n=4/group. Right panel: Volcano plot shows differentially expressed genes in HAECs exposed to NG versus HG. Scatter and volcano plots showing fold changes (log2 values) for inflammaging-related genes in HG-treated HAECs, in the presence of RVX-208 (APA) or vehicle. From Mohammed et al. Antiox. Redox Signalling 2022.
Shafeeq Mohammed (Research Assistant) Era Gorica, PhD (Research Assistant) Martin Geiger (Research Assistant) Valentina Delfine (Research Assistant) Alessia Mongelli (PhD Student)
Swiss National Science Foundation Swiss Heart Foundation Hochschulmedizin Zrich EU Framework Programme Novartis Foundation for Biomedical Research Gebauer Stiftung Stiftung fr wissenschaftliche Forschung Olga Mayenfisch Foundation Swiss Life Foundation Kurt und Senta-Hermann Stiftung EMDO Stiftung Schweizerische Diabetes-Stiftung
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