Autonomous Purkinje cell axonal dystrophy causes ataxia in peroxisomal multifunctional protein-2 deficiency.

Autor:	De Munter S; Department of Pharmaceutical and Pharmacological Sciences, Cell Metabolism, KU Leuven - University of Leuven, Leuven, Belgium., Bamps D; Department of Pharmaceutical and Pharmacological Sciences, Cell Metabolism, KU Leuven - University of Leuven, Leuven, Belgium., Malheiro AR; Neurolipid Biology group, Instituto de Biologia Molecular e Celular - IBMC and Instituto de Inovação e Investigação em Saúde, University of Porto, Porto, Portugal., Kumar Baboota R; Department of Pharmaceutical and Pharmacological Sciences, Cell Metabolism, KU Leuven - University of Leuven, Leuven, Belgium., Brites P; Neurolipid Biology group, Instituto de Biologia Molecular e Celular - IBMC and Instituto de Inovação e Investigação em Saúde, University of Porto, Porto, Portugal., Baes M; Department of Pharmaceutical and Pharmacological Sciences, Cell Metabolism, KU Leuven - University of Leuven, Leuven, Belgium.
Jazyk:	angličtina
Zdroj:	Brain pathology (Zurich, Switzerland) [Brain Pathol] 2018 Sep; Vol. 28 (5), pp. 631-643. Date of Electronic Publication: 2018 Feb 21.
DOI:	10.1111/bpa.12586
Abstrakt:	Peroxisomes play a crucial role in normal neurodevelopment and in the maintenance of the adult brain. This depends largely on intact peroxisomal β-oxidation given the similarities in pathologies between peroxisome biogenesis disorders and deficiency of multifunctional protein-2 (MFP2), the central enzyme of this pathway. Recently, adult patients diagnosed with cerebellar ataxia were shown to have mild mutations in the MFP2 gene, hydroxy-steroid dehydrogenase (17 beta) type 4 (HSD17B4). Cerebellar atrophy also develops in MFP2 deficient mice but the cellular origin of the degeneration is unexplored. In order to investigate whether peroxisomal β-oxidation is essential within Purkinje cells, the sole output neurons of the cerebellum, we generated and characterized a mouse model with Purkinje cell selective deletion of the MFP2 gene. We show that selective loss of MFP2 from mature cerebellar Purkinje neurons causes a late-onset motor phenotype and progressive Purkinje cell degeneration, thereby mimicking ataxia and cerebellar deterioration in patients with mild HSD17B4 mutations. We demonstrate that swellings on Purkinje cell axons coincide with ataxic behavior and precede neurodegeneration. Loss of Purkinje cells occurs in a characteristic banded pattern, proceeds in an anterior to posterior fashion and is accompanied by progressive astro- and microgliosis. These data prove that the peroxisomal β-oxidation pathway is required within Purkinje neurons to maintain their axonal integrity, independent of glial dysfunction. (© 2018 International Society of Neuropathology.)
Databáze:	MEDLINE
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