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The absence of this protein in humans and rodents produces progressive neurodegeneration with brain iron accumulation. Astrocytes express high levels of Cp and iron efflux from these cells has been shown to be central for oligodendrocyte maturation and myelination. To explore the role of astrocytic Cp in brain development and aging we generated a specific conditional KO mouse for Cp in astrocytes (Cp cKO). Deletion of Cp in astrocytes during the first postnatal week induced hypomyelination and a significant delay in oligodendrocyte maturation. This abnormal myelin synthesis was exacerbated throughout the first two postnatal months and accompanied by a reduction in oligodendrocyte iron content, as well as an increase in brain oxidative stress. In contrast to young animals, deletion of astrocytic Cp at 8\u2009months of age engendered iron accumulation in several brain areas and neurodegeneration in cortical regions. Aged Cp cKO mice also showed myelin loss and oxidative stress in oligodendrocytes and neurons, and at 18\u2009months of age, developed abnormal behavioral profiles, including deficits in locomotion and short\u2010term memory. In summary, our results demonstrate that iron efflux\u2014mediated by astrocytic Cp\u2014is essential for both early oligodendrocyte maturation and myelin integrity in the mature brain. Additionally, our data suggest that astrocytic Cp activity is central to prevent iron accumulation and iron\u2010induced oxidative stress in the aging CNS.<\/jats:p>","DOI":"10.1002\/glia.24424","type":"journal-article","created":{"date-parts":[[2023,6,3]],"date-time":"2023-06-03T10:30:36Z","timestamp":1685788236000},"page":"2323-2342","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["The expression of ceruloplasmin in astrocytes is essential for postnatal myelination and myelin maintenance in the adult brain"],"prefix":"10.1002","volume":"71","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4802-6560","authenticated-orcid":false,"given":"V. 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