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The Journal of Neuroscience, April 1, 1999, 19(7):2556-2567

Apparent Loss and Hypertrophy of Interneurons in a Mouse Model of Neuronal Ceroid Lipofuscinosis: Evidence for Partial Response to Insulin-Like Growth Factor-1 Treatment

Jonathan D. Cooper¹, Anne Messer², Andrew K. Feng¹, Jane Chua-Couzens¹, and William C. Mobley¹

¹ Department of Neurology and Neurological Sciences and the Program in Neuroscience, Stanford University, Stanford, California 94305-5489, and ² Wadsworth Center, New York State Department of Health, Albany, New York 12201-2002

The neuronal ceroid lipofuscinoses (NCL) are progressive neurodegenerative disorders with onset from infancy to adulthood that are manifested by blindness, seizures, and dementia. In NCL, lysosomes accumulate autofluorescent proteolipid in the brain and other tissues. The mnd/mnd mutant mouse was first characterized as exhibiting adult-onset upper and lower motor neuron degeneration, but closer examination revealed early, widespread pathology similar to that seen in NCL. We used the autofluorescent properties of accumulated storage material to map which CNS neuronal populations in the mnd/mnd mouse show NCL-like pathological changes. Pronounced, early accumulation of autofluorescent lipopigment was found in subpopulations of GABAergic neurons, including interneurons in the cortex and hippocampus. Staining for phenotypic markers normally present in these neurons revealed progressive loss of staining in the cortex and hippocampus of mnd/mnd mice, with pronounced hypertrophy of remaining detectable interneurons. In contrast, even in aged mutant mice, many hippocampal interneurons retained staining for glutamic acid decarboxylase. Treatment with insulin-like growth factor-1 partially restored interneuronal number and reduced hypertrophy in some subregions. These results provide the first evidence for the involvement of interneurons in a mouse model of NCL. Moreover, our findings suggest that at least some populations of these neurons persist in a growth factor-responsive state.

Key words: neuronal ceroid lipofuscinosis; mnd/mnd; hippocampal and cortical interneurons; GABAergic; neurodegeneration; IGF-1

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Copyright © 1999 Society for Neuroscience  0270-6474/99/1972556-12$05.00/0

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