Epigenetic Axis Regulates Microglial States in Mouse Model of Autoimmune Disease

Researchers have identified a specific epigenetic pathway that controls how microglial cells change their state during experimental autoimmune encephalomyelitis (EAE), a disease model in female mice that mimics aspects of multiple sclerosis. This pathway, termed the Lactate–H4K12la–HDAC1 axis, plays a crucial role in regulating these critical immune cells within the central nervous system. Microglia are the primary immune cells of the brain and spinal cord, and their dynamic state transitions are essential for both maintaining tissue health and responding to injury or disease. The study found that lactate, a metabolic byproduct, influences the epigenetic modification of histone H4, specifically at lysine 12 (H4K12la). This modification, in turn, affects the activity of the enzyme HDAC1 (histone deacetylase 1). The interplay between lactate, H4K12la, and HDAC1 ultimately dictates whether microglia adopt pro-inflammatory or anti-inflammatory states. Understanding this axis provides new insights into the complex mechanisms underlying neuroinflammation and autoimmune conditions affecting the central nervous system. The findings could potentially open avenues for developing targeted therapies aimed at modulating microglial behavior to treat diseases like EAE and multiple sclerosis.