August 20th, 2026
In recent years, an increasing level of attention has been given to microglia as an important contribution to neurodegeneration in the aging brain. Microglia are innate immune cells resident in the central nervous system, analogous to the macrophages found elsewhere in the body. They are deeply involved in the complex processes of normal tissue function and maintenance, not just a defense against pathogens and malfunctioning cells. With age, microglia become more inflammatory at the expense of tissue function. Here, researchers look at this harmful change in the behavior of microglia through the lens of cellular metabolism: what are the alterations in metabolism that accompany and perhaps cause unwanted inflammatory activities in this cell population? Finding ways to adjust the behavior of microglia is becoming a priority in the development of therapies to treat neurodegenerative conditions, and a greater understanding of how these cells change with age is a first step on that path.
Microglia, the resident macrophages of the central nervous system (CNS), are key players in maintaining brain and spinal cord homeostasis and protecting the CNS from damage and disease. During aging, the brain undergoes profound changes-including chronic low-grade inflammation, synaptic dysfunction, and increased vulnerability to neurodegenerative diseases - all of which are closely related to alterations in microglial function. One emerging theme is that microglial metabolism is a crucial determinant of their immune and homeostatic activity.
