C/EBPβ regulates the M2 transcriptome in β-adrenergic-stimulated macrophages

Publication date: Available online 24 May 2019Source: Brain, Behavior, and ImmunityAuthor(s): Donald M. Lamkin, Shreyesi Srivastava, Karen P. Bradshaw, Jenna E. Betz, Kevin B. Muy, Anna M. Wiese, Shelby K. Yee, Rebecca M. Waggoner, Jesusa M.G. Arevalo, Alexander J. Yoon, Kym F. Faull, Erica K. Sloan, Steve W. ColeAbstractAt the M2 terminal of the macrophage activation spectrum, expression of genes is regulated by transcription factors that include STAT6, CREB, and C/EBPβ. Signaling through β-adrenergic receptors drives M2 activation of macrophages, but little is known about the transcription factors involved. In the present study, we found that C/EBPβ regulates the signaling pathway between β-adrenergic stimulation and expression of Arg1 and several other specific genes in the greater M2 transcriptome. β-adrenergic signaling induced Cebpb gene expression relatively early with a peak at 1 hour post-stimulation, followed by peak Arg1 gene expression at 8 hours. C/EBPβ transcription factor activity was elevated at the enhancer region for Arg 1 at both 4 and 8 hours after stimulation but not near the more proximal promoter region. Knockdown of Cebpb suppressed the β-adrenergic-induced peak in Cebpb gene expression as well as subsequent accumulation of C/EBPβ protein in the nucleus, which resulted in suppression of β-adrenergic-induced Arg1 gene expression. Analysis of genome-wide transcriptional profiles identified 20 additional M2 genes that followed the same pattern of...
Source: Brain, Behavior, and Immunity - Category: Neurology Source Type: research