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Molecular Neurodegeneration
Published in: Molecular Neurodegeneration 1/2024

Open Access 01-12-2024 | Research article

An adapted protocol to derive microglia from stem cells and its application in the study of CSF1R-related disorders

Authors: Marie-France Dorion, Diana Casas, Irina Shlaifer, Moein Yaqubi, Peter Fleming, Nathan Karpilovsky, Carol X.-Q. Chen, Michael Nicouleau, Valerio E. C. Piscopo, Emma J. MacDougall, Aeshah Alluli, Taylor M. Goldsmith, Alexandria Schneider, Samuel Dorion, Nathalia Aprahamian, Adam MacDonald, Rhalena A. Thomas, Roy W. R. Dudley, Jeffrey A. Hall, Edward A. Fon, Jack P. Antel, Jo Anne Stratton, Thomas M. Durcan, Roberta La Piana, Luke M. Healy

Published in: Molecular Neurodegeneration | Issue 1/2024

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Abstract

Background

Induced pluripotent stem cell-derived microglia (iMGL) represent an excellent tool in studying microglial function in health and disease. Yet, since differentiation and survival of iMGL are highly reliant on colony-stimulating factor 1 receptor (CSF1R) signaling, it is difficult to use iMGL to study microglial dysfunction associated with pathogenic defects in CSF1R.

Methods

Serial modifications to an existing iMGL protocol were made, including but not limited to changes in growth factor combination to drive microglial differentiation, until successful derivation of microglia-like cells from an adult-onset leukoencephalopathy with axonal spheroids and pigmented glia (ALSP) patient carrying a c.2350G > A (p.V784M) CSF1R variant. Using healthy control lines, the quality of the new iMGL protocol was validated through cell yield assessment, measurement of microglia marker expression, transcriptomic comparison to primary microglia, and evaluation of inflammatory and phagocytic activities. Similarly, molecular and functional characterization of the ALSP patient-derived iMGL was carried out in comparison to healthy control iMGL.

Results

The newly devised protocol allowed the generation of iMGL with enhanced transcriptomic similarity to cultured primary human microglia and with higher scavenging and inflammatory competence at ~ threefold greater yield compared to the original protocol. Using this protocol, decreased CSF1R autophosphorylation and cell surface expression was observed in iMGL derived from the ALSP patient compared to those derived from healthy controls. Additionally, ALSP patient-derived iMGL presented a migratory defect accompanying a temporal reduction in purinergic receptor P2Y12 (P2RY12) expression, a heightened capacity to internalize myelin, as well as heightened inflammatory response to Pam3CSK4. Poor P2RY12 expression was confirmed to be a consequence of CSF1R haploinsufficiency, as this feature was also observed following CSF1R knockdown or inhibition in mature control iMGL, and in CSF1RWT/KO and CSF1RWT/E633K iMGL compared to their respective isogenic controls.

Conclusions

We optimized a pre-existing iMGL protocol, generating a powerful tool to study microglial involvement in human neurological diseases. Using the optimized protocol, we have generated for the first time iMGL from an ALSP patient carrying a pathogenic CSF1R variant, with preliminary characterization pointing toward functional alterations in migratory, phagocytic and inflammatory activities.

Graphical Abstract

Appendix
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Metadata
Title
An adapted protocol to derive microglia from stem cells and its application in the study of CSF1R-related disorders
Authors
Marie-France Dorion
Diana Casas
Irina Shlaifer
Moein Yaqubi
Peter Fleming
Nathan Karpilovsky
Carol X.-Q. Chen
Michael Nicouleau
Valerio E. C. Piscopo
Emma J. MacDougall
Aeshah Alluli
Taylor M. Goldsmith
Alexandria Schneider
Samuel Dorion
Nathalia Aprahamian
Adam MacDonald
Rhalena A. Thomas
Roy W. R. Dudley
Jeffrey A. Hall
Edward A. Fon
Jack P. Antel
Jo Anne Stratton
Thomas M. Durcan
Roberta La Piana
Luke M. Healy
Publication date
01-12-2024
Publisher
BioMed Central
Published in
Molecular Neurodegeneration / Issue 1/2024
Electronic ISSN: 1750-1326
DOI
https://doi.org/10.1186/s13024-024-00723-x

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