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Cuprizone (CPZ)-feeding in mice induces atrophy of peripheral immune organs (thymus and spleen) and suppresses T-cell levels, thereby limiting its use as a model for studying the effects of the immune system in demyelinating diseases such as Multiple Sclerosis (MS). To investigate whether castration ( Cx ) can protect the peripheral immune organs from CPZ-induced atrophy and enable T-cell recruitment into the central nervous system (CNS) following a breach of the blood-brain barrier (BBB), three related studies were carried out. In Study 1,  Cx  prevented the dose-dependent reductions (0.1% < 0.2% CPZ) in thymic and splenic weight, size of the thymic medulla and splenic white pulp, and CD4 and CD8 (CD4/8) levels remained comparable to gonadally intact ( Gi ) control males. Importantly, 0.1% and 0.2% CPZ were equipotent at inducing central demyelination and glial activation. In Study 2, combining  Cx  with 0.1% CPZ-feeding and BBB disruption with pertussis toxin (PT) enhanced CD8 +  T-cell recruitment into the CNS. The increased CD8 +  T-cell level observed in the parenchyma of the cerebrum, cerebellum, brainstem and spinal cord were confirmed by flow cytometry and western blot analyses of CNS tissue. In Study 3, PT+0.1% CPZ-feeding to  Gi  female mice resulted in similar effects on the peripheral immune organs, CNS demyelination, and gliosis comparable to  Gi  males, indicating that testosterone levels alone were not responsible for the immune response seen in Study 2. The combination of  Cx +0.1% CPZ-feeding+PT indicates that CPZ-induced demyelination can trigger an  “inside-out”  immune response when the peripheral immune system is spared and may provide a better model to study the initiating events in demyelinating conditions such as MS.

CD8 T-cell Recruitment Into the Central Nervous System of Cuprizone-Fed Mice: Relevance to Modeling the Etiology of Multiple Sclerosis