Abstract
We studied the number of mast cells and their extent of degranulation in brains of Lewis rats with acute experimental allergic encephalomyelitis (EAE), actively induced with guinea pig spinal cord and Freund's complete adjuvant. Non-immunized controls and EAE rats were killed on days 10, 11, 12, and 16 post-immunization (p.i.). The percentage of degranulated mast cells was significantly increased in EAE brains. Signs of degranulation were observed as early as day 10 p.i. Clinical EAE signs appeared from day 10 p.i. A significant change in mast cell number was not observed. The percentage of degranulated cells was largest at day 16 p.i., at a time when the inflammation had reached the thalamus. This indicates that mast cell degranulation may occur as a result of the inflammation. Collectively, the data suggest that mast cells may play a role in the pathogenesis of EAE.
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