Epigenomic profiling of H3K27ac in mouse brain regions under morphine and LPS exposure

We profiled genome-wide H3K27ac chromatin modifications across four brain regions (hippocampus, prefrontal cortex, striatum, and hypothalamus) in male and female C57BL/6NTac mice using a perinatal morphine exposure model of Neonatal Opioid Withdrawal Syndrome (NOWS). Mice received morphine or saline perinatally, then were challenged with LPS or saline in adulthood, yielding four groups (SAL-SAL, SAL-LPS, MOR-SAL, MOR-LPS). NeuN+ neuronal nuclei (~10,000 per replicate) were isolated by FACS and profiled by MOWChIP-seq (Illumina NovaSeq X Plus, paired-end 150 nt). H3K27ac ChIP-seq identified differentially acetylated enhancers and promoters enriched in immune and metabolic pathways, with the hypothalamus exhibiting the most pronounced chromatin remodeling.