Neuronal inclusions of alpha-synuclein contribute to the pathogenesis of Krabbe disease

• Autores: Smith, Benjamin R.; Santos, Marta B.; Marshal, Michael S.; Cantuti Castelvetri, Ludovico; Lopez Rosas, Aurora; Li, Guannan; Van Breemen, Richard B.; Claycomb, Kumiko I.; Gallea, Jose Ignacio; Celej, Maria Soledad; Crocker, Stephen; Givogri, Maria I.; Bongarzone, Ernesto R.
• Año de publicación: 2014
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Krabbe Disease; Myelin; Psychosine; Dying-Back Pathology; Axonal Degeneration; Synucleinopathies; Α-Synuclein; Ubiquitin; Lewy Bodies
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Demyelination is a major contributor to the general decay of neural functions in children with Krabbe disease. However, recent reports have indicated a significant involvement of neurons and axons in the neuropathology of the disease. In this study, we have investigated the nature of cellular inclusions in the Krabbe brain. Brain samples from the twitcher mouse model for Krabbe disease and from patients affected with the infantile and late-onset forms of the disease were examined for the presence of neuronal inclusions. Our experiments demonstrated the presence of cytoplasmic aggregates of thioflavin-S-reactive material in both human and murine mutant brains. Most of these inclusions were associated with neurons. A few inclusions were detected to be associated with microglia and none were associated with astrocytes or oligodendrocytes. Thioflavin-S-reactive inclusions increased in abundance, paralleling the development of neurological symptoms, and distributed throughout the twitcher brain in areas of major involvement in cognition and motor functions. Electron microscopy confirmed the presence of aggregates of stereotypic β-sheet folded proteinaceous material. Immunochemical analyses identified the presence of aggregated forms of α-synuclein and ubiquitin, proteins involved in the formation of Lewy bodies in Parkinson's disease and other neurodegenerative conditions. In vitro assays demonstrated that psychosine, the neurotoxic sphingolipid accumulated in Krabbe disease, accelerated the fibrillization of α-synuclein. This study demonstrates the occurrence of neuronal deposits of fibrillized proteins including α-synuclein, identifying Krabbe disease as a new α-synucleinopathy.
Fil: Smith, Benjamin R.. University of Illinois; Estados Unidos
Fil: Santos, Marta B.. University of Illinois; Estados Unidos
Fil: Marshal, Michael S.. University of Illinois; Estados Unidos
Fil: Cantuti Castelvetri, Ludovico. University of Illinois; Estados Unidos
Fil: Lopez Rosas, Aurora. University of Illinois; Estados Unidos
Fil: Li, Guannan. University of Illinois; Estados Unidos
Fil: Van Breemen, Richard B.. University of Illinois; Estados Unidos
Fil: Claycomb, Kumiko I.. University Of Connecticut; Estados Unidos
Fil: Gallea, Jose Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; Argentina
Fil: Celej, Maria Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; Argentina
Fil: Crocker, Stephen. University Of Connecticut; Estados Unidos
Fil: Givogri, Maria I.. University of Illinois; Estados Unidos
Fil: Bongarzone, Ernesto R.. University of Illinois; Estados Unidos