Vascular inflammation is present in many cardiovascular diseases, and exogenous glucocorticoids have traditionally been used as a therapy to suppress inflammation. However, recent data have shown that endogenous glucocorticoids, acting through the endothelial glucocorticoid receptor, act as negative regulators of inflammation. Here, we performed ChIP for the glucocorticoid receptor, followed by next-generation sequencing in mouse endothelial cells to investigate how the endothelial glucocorticoid receptor regulates vascular inflammation. We identified a role of the Wnt signaling pathway in this setting and show that loss of the endothelial glucocorticoid receptor results in upregulation of Wnt signaling both in vitro and in vivo using our validated mouse model. Furthermore, we demonstrate glucocorticoid receptor regulation of a key gene in the Wnt pathway, Frzb, via a glucocorticoid response element gleaned from our genomic data. These results suggest a role for endothelial Wnt signaling modulation in states of vascular inflammation.
Han Zhou, Sameet Mehta, Swayam Prakash Srivastava, Kariona Grabinska, Xinbo Zhang, Chris Wong, Ahmad Hedayat, Paola Perrotta, Carlos Fernández-Hernando, William C. Sessa, Julie E. Goodwin
Primer-specific qPCR for genes in the Wnt signaling pathway, which were identified in the top 1000 peaks of the glucocorticoid receptor (GR) ChIP-seq data set, was performed both in vitro and in vivo.