Proteomic Analysis of Human iPSC-Derived Neural Stem Cells and Motor Neurons Identifies Proteasome Structural Alterations
Álvarez Pérez, Iñaki (Universitat Autònoma de Barcelona. Departament de Biologia Cel·lular, de Fisiologia i d'Immunologia)
Tirado-Herranz, Adrián (Universitat Autònoma de Barcelona. Departament de Biologia Cel·lular, de Fisiologia i d'Immunologia)
Alvarez-Palomo, Belén (Banc de Sang i Teixits (Barcelona, Catalunya))
Osete, Jordi Requena (Oslo University Hospital (Oslo, Noruega))
Edel, Michael J (Universitat Autònoma de Barcelona. Departament de Ciències Morfològiques)

Data:	2023
Resum:	Background: Proteins targeted by the ubiquitin proteasome system (UPS) are identified for degradation by the proteasome, which has been implicated in the development of neurodegenerative diseases. Major histocompatibility complex (MHC) molecules present peptides broken down by the proteasome and are involved in neuronal plasticity, regulating the synapse number and axon regeneration in the central or peripheral nervous system during development and in brain diseases. The mechanisms governing these effects are mostly unknown, but evidence from different compartments of the cerebral cortex indicates the presence of immune-like MHC receptors in the central nervous system. Methods: We used human induced pluripotent stem cells (iPSCs) differentiated into neural stem cells and then into motor neurons as a developmental model to better understand the structure of the proteasome in developing motor neurons. We performed a proteomic analysis of starting human skin fibroblasts, their matching iPSCs, differentiated neural stem cells and motor neurons that highlighted significant differences in the constitutive proteasome and immunoproteasome subunits during development toward motor neurons from iPSCs. Results: The proteomic analysis showed that the catalytic proteasome subunits expressed in fibroblasts differed from those in the neural stem cells and motor neurons. Western blot analysis confirmed the proteomic data, particularly the decreased expression of the β5i (PSMB8) subunit immunoproteasome in MNs compared to HFFs and increased β5 (PSMB5) in MNs compared to HFFs. Conclusion: The constitutive proteasome subunits are upregulated in iPSCs and NSCs from HFFs. Immunoproteasome subunit β5i expression is higher in MNs than NSCs; however, overall, there is more of a constitutive proteasome structure in MNs when comparing HFFs to MNs. The proteasome composition may have implications for motor neuron development and neurodevelopmental diseases that warrant further investigation.
Ajuts:	Ministerio de Economía y Competitividad RD16/0011/0024 Ministerio de Ciencia e Innovación BFU2011-26596 Ministerio de Economía y Competitividad BFU2014-54467-P
Nota:	Altres ajuts: Fundació La Marató de TV3 (20172110/FBG309768)
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Proteomics ; Induced pluripotent stem cells ; Differentiation ; Neural stem cells ; Motor neurons ; 26S proteasome ; Proteasome
Publicat a:	Cells, Vol. 12 (december 2023) , ISSN 2073-4409

DOI: 10.3390/cells12242800
PMID: 38132120

13 p, 3.5 MB

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