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Delineating Astrocytic Cytokine Responses in a Human Stem Cell Model of Neural Trauma.

Published version
Peer-reviewed

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Authors

Thelin, Eric Peter 
Hall, Claire E 
Tyzack, Giulia E 
Frostell, Arvid 
Giorgi-Coll, Susan 

Abstract

Neuroinflammation has been shown to mediate the pathophysiological response following traumatic brain injury (TBI). Accumulating evidence implicates astrocytes as key immune cells within the central nervous system (CNS), displaying both pro- and anti-inflammatory properties. The aim of this study was to investigate how in vitro human astrocyte cultures respond to cytokines across a concentration range that approximates the aftermath of human TBI. To this end, enriched cultures of human induced pluripotent stem cell (iPSC)-derived astrocytes were exposed to interleukin-1β (IL-1β) (1-10,000 pg/mL), IL-4 (1-10,000 pg/mL), IL-6 (100-1,000,000 pg/mL), IL-10 (1-10,000 pg/mL) and tumor necrosis factor (TNF)-α (1-10,000 pg/mL). After 1, 24, 48 and 72 h, cultures were fixed and immunolabeled, and the secretome/supernatant was analyzed at 24, 48, and 72 h using a human cytokine/chemokine 39-plex Luminex assay. Data were compared to previous in vitro studies of neuronal cultures and clinical TBI studies. The secretome revealed concentration-, time- and/or both concentration- and time-dependent production of downstream cytokines (29, 21, and 17 cytokines, respectively, p<0.05). IL-1β exposure generated the most profound downstream response (27 cytokines), IL-6 and TNF had intermediate responses (13 and 11 cytokines, respectively), whereas IL-4 and IL-10 only led to weak responses over time or in escalating concentration (8 and 8 cytokines, respectively). Notably, expression of IL-1β, IL-6, and TNF cytokine receptor mRNA was higher in astrocyte cultures than in neuronal cultures. Several secreted cytokines had temporal trajectories, which corresponded to those seen in the aftermath of human TBI. In summary, iPSC-derived astrocyte cultures exposed to cytokine concentrations reflecting those in TBI generated an increased downstream cytokine production, particularly IL-1β. Although more work is needed to better understand how different cells in the CNS respond to the neuroinflammatory milieu after TBI, our data shows that iPSC-derived astrocytes represent a tractable model to study cytokine stimulation in a cell type-specific manner.

Description

Keywords

IL-10, IL-1β, IL-4, IL-6, TBI, TNF, cytokine exposure, human iPSC-derived astrocytes, in vitro, Astrocytes, Brain Injuries, Traumatic, Cells, Cultured, Cytokines, Humans, Induced Pluripotent Stem Cells, Neural Stem Cells

Journal Title

J Neurotrauma

Conference Name

Journal ISSN

0897-7151
1557-9042

Volume Title

37

Publisher

Mary Ann Liebert Inc
Sponsorship
Cambridge University Hospitals NHS Foundation Trust (CUH) (unknown)
Cambridge University Hospitals NHS Foundation Trust (CUH) (146281)
Medical Research Council (G0802251)
Royal College of Surgeons of England (2016/2017)
Academy of Medical Sciences (Unknown)
Medical Research Council (G0600986)
European Commission (602150)
Medical Research Council (G0600986/1)
Medical Research Council (G0802251/1)
EPT is supported by post-doctoral scholarships from the Swedish Society for Medical Research and Swedish Society of Medicine (grant no. SLS-587221). KLHC is supported by the National Institute for Health Research Biomedical Research Centre, Cambridge (Neuroscience Theme; Brain Injury and Repair Theme). PJH is supported by a Research Professorship from the National Institute for Health Research (NIHR), the NIHR Cambridge Biomedical Research Centre, the NIHR Global Health Research Group on Neurotrauma a European Union Seventh Framework Program grant (CENTER-TBI; grant no. 602150), and the Royal College of Surgeons of England. RP is supported by an MRC / MNDA Lady Edith Wolfson Senior Clinical Fellowship (MR/S006591/1). We also acknowledge support from the University College London Hospital Biomedical Research Centre. AH is supported by the Medical Research Council/Royal College of Surgeons of England Clinical Research Training Fellowship, Royal College of Surgeons of England Pump Priming Grant and the National Institute for Health Research Biomedical Research Centre, Cambridge. The Luminex 200 analyser was purchased with Medical Research Council (MRC) funding (G0600986 ID79068). We acknowledge the DPUK/MRC platform for provision of the Opera Phenix for high-throughput iPSC analysis.