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Storage Vesicles in Neurons Are Related to Golgi Complex Alterations in Mucopolysaccharidosis IIIB

Overview
Journal Am J Pathol
Publisher Elsevier
Specialty Pathology
Date 2010 Nov 2
PMID 21037080
Citations 24
Authors
Affiliations
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Abstract

The accumulation of intracellular storage vesicles is a hallmark of lysosomal storage diseases. Neither the identity nor origin of these implicated storage vesicles have yet been established. The vesicles are often considered as lysosomes, endosomes, and/or autophagosomes that are engorged with undigested materials. Our studies in the mouse model of mucopolysaccharidosis type IIIB, a lysosomal storage disease that induces neurodegeneration, showed that large storage vesicles in cortical neurons did not receive material from either the endocytic or autophagy pathway, which functioned normally. Storage vesicles expressed GM130, a Golgi matrix protein, which mediates vesicle tethering in both pre- and cis-Golgi compartments. However, other components of the tethering/fusion complex were not associated with GM130 on storage vesicles, likely accounting for both the resistance of the vesicles to brefeldin A and the alteration of Golgi ribbon architecture, which comprised distended cisterna connected to LAMP1-positive storage vesicles. We propose that alteration in the GM130-mediated control of vesicle trafficking in pre-Golgi and Golgi compartments affects Golgi biogenesis and gives rise to a dead-end storage compartment. Vesicle accumulation, Golgi disorganization, and alterations of other GM130 functions may account for neuron dysfunction and death.

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