The Role of Attenuated Astrocyte Activation in Infantile Neuronal Ceroid Lipofuscinosis

Overview

Journal J Neurosci

Specialty Neurology

Date 2011 Oct 28

PMID 22031903

Citations 52

Authors

Shannon L Macauley

Milos Pekny

Mark S Sands

Affiliations

Soon will be listed here.

Abstract

Infantile neuronal ceroid lipofuscinosis (INCL) is an inherited neurodegenerative disorder affecting the CNS during infancy. INCL is caused by mutations in the CLN1 gene that lead to a deficiency in the lysosomal hydrolase, palmitoyl protein thioesterase 1 (PPT1). A murine model of INCL, the PPT1-deficient (PPT1(-/-)) mouse, is an accurate phenocopy of the human disease. The first pathological change observed in the PPT1(-/-) brain is regional areas of glial fibrillary acidic protein (GFAP) upregulation, which predicts future areas of neurodegeneration. We hypothesized that preventing GFAP and vimentin upregulation in reactive astrocytes will alter the CNS disease. To test this hypothesis, we generated mice simultaneously carrying null mutations in the GFAP, Vimentin, and PPT1 genes (GFAP(-/-)Vimentin(-/-)PPT1(-/-)). Although the clinical and pathological features of the GFAP(-/-)Vimentin(-/-)PPT1(-/-) mice are similar to INCL, the disease appears earlier and progresses more rapidly. One mechanism underlying this accelerated phenotype is a profound neuroinflammatory response within the CNS. Thus, our data identify a protective role for intermediate filament upregulation during astrocyte activation in INCL, a model of chronic neurodegeneration.

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