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Open Access 01-12-2015 | Review

The role of the ubiquitin proteasome system in cerebellar development and medulloblastoma

Authors: Jerry Vriend, Saeid Ghavami, Hassan Marzban

Published in: Molecular Brain | Issue 1/2015

Abstract

Cerebellar granule cells precursors are derived from the upper rhombic lip and migrate tangentially independent of glia along the subpial stream pathway to form the external germinal zone. Postnatally, granule cells migrate from the external germinal zone radially through the Purkinje cell layer, guided by Bergmann glia fibers, to the internal granular cell layer.

Medulloblastomas (MBs) are the most common malignant childhood brain tumor. Many of these tumors develop from precursor cells of the embryonic rhombic lips. Four main groups of MB are recognized. The WNT group of MBs arise primarily from the lower rhombic lip and embryonic brainstem. The SHH group of MBs originate from cerebellar granule cell precursors in the external germinal zone of the embryonic cerebellum. The cellular origins of type 3 and type 4 MBs are not clear.

Several ubiquitin ligases are revealed to be significant factors in development of the cerebellum as well as in the initiation and maintenance of MBs. Proteasome dysfunction at a critical stage of development may be a major factor in determining whether progenitor cells which are destined to become granule cells differentiate normally or become MB cells. We propose the hypothesis that proteasomal activity is essential to regulate the critical transition between proliferating granule cells and differentiated granule cells and that proteasome dysfunction may lead to MB. Proteasome dysfunction could also account for various mutations in MBs resulting from deficiencies in DNA checkpoint and repair mechanisms prior to development of MBs.

Data showing a role for the ubiquitin ligases β-TrCP, FBW7, Huwe1, and SKP2 in MBs suggest the possibility of a classification of MBs based on the expression (over expression or under expression) of specific ubiquitin ligases which function as oncogenes, tumor suppressors or cell cycle regulators.

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Title: The role of the ubiquitin proteasome system in cerebellar development and medulloblastoma
Authors: Jerry Vriend
Saeid Ghavami
Hassan Marzban
Publication date: 01-12-2015
Publisher: BioMed Central
Published in: Molecular Brain / Issue 1/2015
Electronic ISSN: 1756-6606
DOI: https://doi.org/10.1186/s13041-015-0155-5

Keynote webinar | Spotlight on medication adherence

Springer Medicine

The role of the ubiquitin proteasome system in cerebellar development and medulloblastoma

Abstract

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

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