Eosinophils: Friend or Foe? Eosinophilic Disorders

Eosinophils: Friend or Foe? Eosinophilic Disorders By Kathleen Hoffman, PhD, MSPH Eosinophils are amazing, power-packed cells of the innate immune system. Loaded with granules of cytokines, chemokines, RNAses, cationic proteins, growth factors and more, these leukocytes were thought to be the body’s primary tool to destroy parasites. Now, however, eosinophils are being understood as regulators of inflammation and tissue regeneration. They are also involved in maintaining the defensive structure of the epithelium, residing in mucosal tissue that interfaces with the environment. Additionally, they act as antigen presenting cells (APCs), communicating between the innate and adaptive immune systems. [...]