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Immunology of Substance Use Disorders

As in other psychiatric disorders, the role of the immune system is gathering increasing attention as an important mechanism in substance use disorders. Addiction is a complex condition in which a person engages in drug-seeking and drug-taking behaviors to accentuate the reward processes in the brain and avoid negative withdrawal states. Due in part to the activation of stress responses during drug withdrawal, high levels of peripheral pro-inflammatory cytokines are observed in this phase, and these immune changes might contribute to the behavioral negative reinforcing effects of the drug. This and other observations suggest that the immune system might play a role in the development of substance use disorders, also representing a potential target for biomarker and therapeutic strategy development (e.g., vaccines).