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(American Journal of Pathology. 1998;153:649-663.)
© 1998 American Society for Investigative Pathology


Animal Models

Histopathological Characterization of Magnetic Resonance Imaging-Detectable Brain White Matter Lesions in a Primate Model of Multiple Sclerosis

A Correlative Study in the Experimental AutoimmuneEncephalomyelitis Model in Common Marmosets (Callithrixjacchus)

Bert A. 't Hart* , Jan Bauer{dagger} , Henk-Jan Muller{ddagger} , Bert Melchers§ , Klaas Nicolay{ddagger} , Herbert Brok* , Ronald E. Bontrop* , Hans Lassmann{dagger} and Luca Massacesi¶

From the Department of Immunobiology,* Biomedical Primate Research Centre, Rijswijk, The Netherlands; Institute of Neurology,{dagger} University of Vienna, Vienna, Austria; Bijvoet Centre and Image Sciences Institute,{ddagger} Utrecht University, Utrecht, The Netherlands; TNO-PML, Pharmacology Research Group,§ Prins Maurits Laboratory, Rijswijk, The Netherlands; and Department of Neurological and Psychiatric Sciences, University of Florence, Florence, Italy

Experimental autoimmune encephalomyelitis in the common marmoset, a nonhuman primate species (Callithrix jacchus), is a new model for multiple sclerosis. Given the close immunological relationship between marmosets and humans, it is an attractive model for investigating immunopathological pathways relevant to multiple sclerosis and to evaluate new treatments for the disease. Unlike in the originally documented model, experimental autoimmune encephalomyelitis induced without the use of Bordetella pertussis led to a chronic disease of moderate severity. The clinical course of experimental autoimmune encephalomyelitis in the present model was mainly chronic and progressive, but periods of incomplete remission did occur. At the chronic stage of the disease, actively demyelinating lesions were found together with inactive demyelinated and remyelinated (shadow) plaques. Before immunization and during clinically active experimental autoimmune encephalomyelitis, T1- and T2-weighted magnetic resonance brain images were obtained. Correlation of the data from the magnetic resonance images and the neuropathology analysis revealed that the hyperintense regions in T2-weighted images represented both active and inactive remyelinating lesions. Quantification showed that the number of lesions in T2-weighted magnetic resonance images equalled those found by pathological examination, and thus T2-weighted magnetic resonance imaging can be used to discern the total lesion load. Extravasation of gadolinium-diethylenetriamine-penta-acetic acid (triple dose) was found only in lesions, which by histopathology were shown to be engaged in the process of active demyelination.





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