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Review: Brain—immune communication psychoneuroimmunology of multiple sclerosis

Technische Universität Dresden, Klinik und Poliklinik für Neurologie, Multiple Sklerose Zentrum Dresden, Fetscherstr 74, 01307 Dresden, Germany, kern{at}neuro.med.tu-dresden.de

T. Ziemssen

Technische Universität Dresden, Klinik und Poliklinik für Neurologie, Multiple Sklerose Zentrum Dresden, Fetscherstr 74, 01307 Dresden, Germany

The central nervous system (CNS) and the immune system are two extremely complex and highly adaptive systems. In the face of a real or anticipated threat, be it physical (eg, infection) or psychological (eg, psychosocial stress) in nature, the two systems act in concert to provide optimal adaptation to the demanding internal or environmental conditions. During instances of well being, the communication between these two systems is well tuned and balanced. However, a disturbed crosstalk between the CNS and the immune system is thought to play a major role in a wide series of disorders characterized by a hyporesponsive or hyperresponsive immune system. In multiple sclerosis (MS), a chronic inflammatory and neurodegenerative disease, an excess of inflammatory processes seems to be a hallmark and there is growing evidence for a disturbed communication between the CNS and the immune system as a crucial pathogenic factor. While the exact mechanisms for these phenomena are still poorly understood, the young discipline of psychoneuroimmunology (PNI), which focuses on the mechanism underlying the brain to immune crosstalk, might offer some insights into the existing pathogenic mechanisms. Findings from the field of PNI might also help to gain a better understanding regarding the origin and course of MS clinical symptoms such as fatigue and depression.

Key Words: multiple sclerosis • psychoneuroimmunology • HPA axis • ANS • cortisol • stress

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