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Peptidylarginine deiminases are a family of calcium-activated enzymes with multifaceted roles in physiological and pathological processes, including in the central nervous system. Peptidylarginine deiminases cause post-translational deimination/citrullination, leading to changes in structure and function of a wide range of target proteins. Deimination can facilitate protein moonlighting, modify protein-protein interaction, cause protein dysfunction and induce inflammatory responses. Peptidylarginine deiminases also regulate the biogenesis of extracellular vesicles, which play important roles in cellular communication through transfer of extracellular vesicle-cargo, e.g., proteins and genetic material. Both peptidylarginine deiminases and extracellular vesicles are linked to a number of pathologies, including in the central nervous system, and their modulation with pharmacological peptidylarginine deiminase inhibitors have shown great promise in several in vitro and in vivo central nervous system disease models. Furthermore, extracellular vesicles derived from mesenchymal stem cells have been assessed for their therapeutic application in central nervous system injury. As circulating extracellular vesicles can be used as non-invasive liquid biopsies, their specific cargo-signatures (including deiminated proteins and microRNAs) may allow for disease "fingerprinting" and aid early central nervous system disease diagnosis, inform disease progression and response to therapy. This mini-review discusses recent advances in the field of peptidylarginine deiminase and extracellular vesicle research in the central nervous system, focusing on several central nervous system acute injury, degeneration and cancer models.

Peptidylarginine deiminases and extracellular vesicles: prospective drug targets and biomarkers in central nervous system diseases and repair