Neuroinflammation in the rat--CNS cells and their role in the regulation of immune reactions.

Recent discoveries suggest that the resident cells of the central nervous system (CNS) the nerve cells and glia, play a more immunologically active role than was previously assumed. Neuroglial communication is of central interest in virtually all types of pathological conditions that affect the brain and several features of the activation that results from nerve cell damage resemble the type of innate immune reactions that occur in other parts of the body In particular, the characteristics of the activation of these CNS cells will affect both the interaction with cells of the immune system as well as processes related to neurodegeneration and regeneration. We here review data regarding 3 different aspects of local inflammatory activation in the rat nervous system: (i) the genetic heterogeneity of glial activation across inbred strains after nerve injury, (ii) expression of MHC class I genes in the CNS and (iii) neuroprotective effects of CNS antigen autoreactive immune reactions. Apart from neuroimmune diseases such as experimental autoimmune encephalomyelitis/multiple sclerosis, these features are also of relevance for a wider range of neurological diseases which present pathological signs of inflammation, such as Alzheimer's dementia, cerebrovascular diseases and CNS trauma.