Cited by 158Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsNeurological Disease Mechanisms and Treatments

PU.1 regulates Alzheimer’s disease-associated genes in primary human microglia

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Rustenhoven, Justin, Smith, Amy M., Smyth, Leon C., Jansson, Deidre, Scotter, Emma L., Swanson, Molly E. V., Aalderink, Miranda, Coppieters, Natacha +9 more·2018·Molecular Neurodegeneration

Abstract

BACKGROUND: Microglia play critical roles in the brain during homeostasis and pathological conditions. Understanding the molecular events underpinning microglial functions and activation states will further enable us to target these cells for the treatment of neurological disorders. The transcription factor PU.1 is critical in the development of myeloid cells and a major regulator of microglial gene expression. In the brain, PU.1 is specifically expressed in microglia and recent evidence from genome-wide association studies suggests that reductions in PU.1 contribute to a delayed onset of Alzheimer's disease (AD), possibly through limiting neuroinflammatory responses. METHODS: To investigate how PU.1 contributes to immune activation in human microglia, microarray analysis was performed on primary human mixed glial cultures subjected to siRNA-mediated knockdown of PU.1. Microarray hits were confirmed by qRT-PCR and immunocytochemistry in both mixed glial cultures and isolated microglia following PU.1 knockdown. To identify attenuators of PU.1 expression in microglia, high throughput drug screening was undertaken using a compound library containing FDA-approved drugs. NanoString and immunohistochemistry was utilised to investigate the expression of PU.1 itself and PU.1-regulated mediators in primary human brain tissue derived from neurologically normal and clinically and pathologically confirmed cases of AD. RESULTS: Bioinformatic analysis of gene expression upon PU.1 silencing in mixed glial cultures revealed a network of modified AD-associated microglial genes involved in the innate and adaptive immune systems, particularly those involved in antigen presentation and phagocytosis. These gene changes were confirmed using isolated microglial cultures. Utilising high throughput screening of FDA-approved compounds in mixed glial cultures we identified the histone deacetylase inhibitor vorinostat as an effective attenuator of PU.1 expression in human microglia. Further characterisation of vorinostat in isolated microglial cultures revealed gene and protein changes partially recapitulating those seen following siRNA-mediated PU.1 knockdown. Lastly, we demonstrate that several of these PU.1-regulated genes are expressed by microglia in the human AD brain in situ. CONCLUSIONS: Collectively, these results suggest that attenuating PU.1 may be a valid therapeutic approach to limit microglial-mediated inflammatory responses in AD and demonstrate utility of vorinostat for this purpose.

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Crossref · 10.1186/s13024-018-0277-1

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  • PU.1 reduction has been reported to result in the down-regulation of massive proinflammatory genes and cell cycle-related genes.

    “given that PU.1 reduction has been reported to result in the down-regulation of massive proinflammatory genes and cell cycle–related genes (14, 43).”

    From Arresting the bad seed: HDAC3 regulates proliferation of different microglia after ischemic stroke (2024) · cites this paper as [43]

    The Results section on microarray analysis reports 129 downregulated genes after PU.1 silencing in mixed glial cultures. But the Results section on isolated human microglia says inflammatory cytokines and chemokines were largely unaltered, and the copy does not establish downregulation of cell cycle-related genes. The cited paper therefore supports broad gene downregulation, not the specific gene categories claimed. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Another similar study observed no reduction in microglia number, though PU.1 loss was measured at culture level so reduction could not be quantified on single-cell level.

    “Another similar study observed no reduction in microglia number, though PU.1 loss was measured at a culture level so the reduction could not be quantified on a single-cell level31.”

    From Modest changes in Spi1 dosage reveal the potential for altered microglial function as seen in Alzheimer’s disease (2021) · cites this paper as [31]

    The Results section, “Confirmation of microarray analysis in isolated human brain microglia” (page unavailable), reports no change in cell number or microglial purity after PU.1 knockdown and an approximately 60% reduction in PU.1 protein expression. It does not state that the reduction could not be quantified at the single-cell level; the Methods section describes imaging-based measurement of staining intensity and scoring of individual cells. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • Increased PU.1 expression levels are associated with Alzheimer's disease and Huntington's disease.

    “Increased PU.1 expression levels are associated with AD (Gjoneska et al., 2015; Huang et al., 2017; Rustenhoven et al., 2018) and Huntington’s disease (Crotti et al., 2014)”
  • High-throughput screening of 1280 FDA-approved compounds identified vorinostat as a candidate drug for attenuating PU.1 level, which mimics partial effects of PU.1 knockdown.

    “High-throughput screening of 1280 US Food and Drug Administration–approved compounds also identified an HDAC inhibitor, vorinostat, as a candidate drug for attenuating PU.1 level, which is then found to mimic partial effects of PU.1 knockdown (43).”
  • In BV2 microglial cells, protective low expression of PU.1 led to decreased phagocytic uptake.

    “In BV2 microglial cells protective low expression of PU.1 led to decreased phagocytic uptake (Fig. 2), which is in line with previous data showing that siRNA knock-down of PU.1 in human microglia in vitro reduces expression of genes involved in phagocytic and antigen presentation pathways (Rustenhoven et al., 2018).”

    From Alzheimer's-associated PU.1 expression levels regulate microglial inflammatory response (2021) · cites this paper as Rustenhoven et al., 2018

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Authors
Rustenhoven, J., Smith, A. M., Smyth, L. C., Jansson, D., Scotter, E. L., Swanson, M. E. V., Aalderink, M., Coppieters, N., Narayan, P., Handley, R., Overall, C., Park, T. I. H., Schweder, P., Heppner, P., Curtis, M. A., Faull, R. L. M., & Dragunow, M.
Affiliations
  • University of Auckland (NZ)
  • Imperial College London (GB)
  • Auckland City Hospital (NZ)
Corresponding author
Dragunow, Mike
Venue
Molecular Neurodegeneration
Published
2018-08-20
Volume
13
Issue
1
Pages
44-44
ISSN
1750-1326 (ISSN-L)
OpenAlex
W2888188888
Cited by
155
References
83
Citations by year
2026: 8 · 2025: 26 · 2024: 20 · 2023: 21 · 2022: 31 · 2021: 22 · 2020: 17 · 2019: 9 · 2018: 1
FWCI
5.61
Type
journal article
Language
en
Open access
Locations
  • Molecular Neurodegeneration (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • ResearchSpace (University of Auckland) (submittedVersion, cc-by)
  • Spiral (Imperial College London) (submittedVersion, other-oa)
Funders
  • Hugh Green Foundation
  • Neurological Foundation of New Zealand
  • Health Research Council of New Zealand
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
PU.1, Alzheimer's disease, microglia, transcription factors, neuroinflammation, vorinostat, histone deacetylase inhibitors, microglial gene expression, antigen presentation, phagocytosis, mixed glial cultures, therapeutic target
MeSH terms
Vorinostat, Proto-Oncogene Protein Spi-1, Alzheimer Disease, Gene Expression Regulation, Humans, Proto-Oncogene Proteins, Trans-Activators, Microglia, Histone Deacetylase Inhibitors

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