ACTA1 and peritonitis: Immunohistochemical staining showed that the expression of PF markers (α-smooth muscle actin (α-SMA), Collagen I), neutrophils (MPO) and macrophages (CD68, F4/80) in the peritonitis effluent group was increased, and real-time qPCR showed significantly elevated expression of inflammatory markers (IL-1β, IL-6) and fibrosis markers (TGF-β1, α-SMA).