Publikationsdatenbank

Novel protocol for the isolation of highly purified neonatal murine microglia and astrocytes (2022)

Art

Zeitschriftenartikel / wissenschaftlicher Beitrag

Autoren

Zelenka, Laura (WE 7)

Pägelow, Dennis (WE 7)

Krüger, Christina

Seele, Jana

Ebner, Friederike (WE 6)

Rausch, Sebastian (WE 6)

Rhode, Manfred

Lehnardt, Seija

van Vorst, Kira (WE 7)

Fulde, Marcus (WE 7)

Quelle

Journal of neuroscience methods

Bandzählung: 366

Seiten: Artikel 109420

ISSN: 0165-0270

Sprache

Englisch

Verweise

URL (Volltext): https://www.sciencedirect.com/science/article/pii/S0165027021003551

DOI: 10.1016/j.jneumeth.2021.109420

Kontakt

Institut für Mikrobiologie und Tierseuchen

Robert-von-Ostertag-Str. 7-13
14163 Berlin
+49 30 838 51843 / 66949
mikrobiologie@vetmed.fu-berlin.de

Abstract / Zusammenfassung

Background:
The crosstalk and reactivity of the cell type glia, especially microglia and astrocytes, have progressively gathered research attention in understanding proper brain function regulated by the innate immune response. Therefore, methods to isolate highly viable and pure glia for the analysis on a cell-specific level are indispensable.

New method:
We modified previously established techniques: Animal numbers were reduced by multiple microglial harvests from the same mixed glial culture, thereby maximizing microglial yields following the principles of the 3Rs (replacement, reduction, and refinement). We optimized Magnetic-activated cell sorting (MACS®) of microglia and astrocytes by applying cultivated primary glial cell suspensions instead of directly sorting dissociated single cell suspension.

Results:
We generated highly viable and pure microglia and astrocytes derived from a single mixed culture with a purity of ~99%, as confirmed by FACS analysis. Field emission scanning electron microscopy (FESEM) demonstrated integrity of the MACS-purified glial cells. Tumor necrosis factor (TNF) and Interleukin-10 (IL-10) ELISA confirmed pro- and anti-inflammatory responses to be functional in purified glia, but significantly weakened compared to non-purified cells, further highlighting the importance of cellular crosstalk for proper immune activation.

Comparison with existing method(s):
Conceptualization, Writing – Original Draft, Writing – Review & Editing, Supervision, Project administration, Funding acquisitionUnlike previous studies that either isolated a single type of glia or displayed a substantial proportion of contamination with other cell types, we achieved isolation of both microglia and astrocytes at an increased purity (99-100%).

Conclusions:
We have created an optimized protocol for the efficient purification of both primary microglia and astrocytes. Our results clearly demonstrate the importance of purity in glial cell cultivation in order to examine immune responses, which particularly holds true for astrocytes. We propose the novel protocol as a tool to investigate the cell type-specific crosstalk between microglia and astrocytes in the frame of CNS diseases.