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Using conditional knock-out mice, we recently showed that peroxisome deficiency in liver has a severe and persistent impact on the formation of cortex and cerebellum, whereas absence of functional peroxisomes from the CNS only causes developmental delays without obvious alteration of brain architecture.<\/jats:p><jats:p>We now report that a substantial fraction of the latter<jats:italic>Nes-Pex5<\/jats:italic>knock-out mice survive into adulthood but develop progressive motoric and coordination problems, impaired exploration, and a deficit in cognition and die before the age of 6 months. Histopathologically, both the white and gray matter of the CNS displayed a region-specific accumulation of neutral lipids, astrogliosis and microgliosis, upregulation of catalase, and scattered cell death.<jats:italic>Nes-Pex5<\/jats:italic>knock-out mice featured a dramatic reduction of myelin staining in corpus callosum, whereas cerebellum and other white matter tracts were less affected or unchanged. This was accompanied by a depletion of alkenylphospholipids in myelin and differentially reduced immunoreactivity of myelin proteins. EM analysis revealed that myelin wrappings around axons did still form, but they showed a reduction in thickness relative to axon diameters. Remarkably, multifocal axonal damage occurred in the corpus callosum. Thereby, debris accumulated between axolemma and inner myelin surface and axons collapsed, although myelin sheaths remained present. These anomalies of myelinated axons were already present in juvenile mice but aggravated in adulthood. Together, loss of CNS peroxisomal metabolism both affects myelin sheaths and axonal integrity possibly via independent pathways.<\/jats:p>","DOI":"10.1523\/jneurosci.4968-07.2008","type":"journal-article","created":{"date-parts":[[2008,4,9]],"date-time":"2008-04-09T16:28:20Z","timestamp":1207758500000},"page":"4015-4027","source":"Crossref","is-referenced-by-count":104,"title":["Absence of Functional Peroxisomes from Mouse CNS Causes Dysmyelination and Axon 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