Correlation Between 2',3'-Cyclic Nucleotide 3'-Phosphohydrolase Activity and Demyelination In Vitro Using a Syngeneic System

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Abstract
Cultures of myelinated SJL/J fetal mouse spinal cord were incubated with serum and lymphoid cells from syngeneic animals with experimental allergic encephalomyelitis (EAE) induced by syngeneic spinal cord homogenate (SSCH) in complete Freund's adjuvant or others injected with complete Freund's adjuvant alone. After 24 or 48 h of exposure, demyelination was determined by light microscopic examination and quantification of 2′,3′-cyclic nucleotide 3′-phosphohydrolase activity. Cultures exposed to spleen or lymph node cells from SSCH-sensitized animals showed the greatest alterations in myelin and decreases in 2′,3′-cyclic nucleotide 3′-phosphohydrolase activity whereas serum from these animals had less effect. Cells and serum from complete Freund's adjuvant-injected control animals also induced structural changes in myelin that were significantly less than changes induced by cells and serum from animals with EAE. These experiments show that lymphoid cells and serum obtained from SJL/J mice with acute EAE affected myelin biochemistry and morphology in syngeneic CNS cultures.