Cited by 159Neuroinflammation and Neurodegeneration MechanismsTGF-β signaling in diseasesImmune cells in cancer

TGFβ signalling plays an important role in IL4-induced alternative activation of microglia

Open access
Zhou, Xiaolai, Spittau, Björn, Krieglstein, Kerstin·2012·Journal of Neuroinflammation

Abstract

BACKGROUND: Microglia are the resident immune cells of the central nervous system and are accepted to be involved in a variety of neurodegenerative diseases. Several studies have demonstrated that microglia, like peripheral macrophages, exhibit two entirely different functional activation states, referred to as classical (M1) and alternative (M2) activation. TGFβ is one of the most important anti-inflammatory cytokines and its effect on inhibiting microglia or macrophage classical activation has been extensively studied. However, the role of TGFβ during alternative activation of microglia has not been described yet. METHODS: To investigate the role of TGFβ in IL4-induced microglia alternative activation, both, BV2 as well as primary microglia from new born C57BL/6 mice were used. Quantitative RT-PCR and western blots were performed to detect mRNA and protein levels of the alternative activation markers Arginase1 (Arg1) and Chitinase 3-like 3 (Ym1) after treatment with IL4, TGFβ or both. Endogenous TGFβ release after IL4 treatment was evaluated using the mink lung epithelial cell (MLEC) assay and a direct TGFβ2 ELISA. TGFβ receptor type I inhibitor and MAPK inhibitor were applied to address the involvement of TGFβ signalling and MAPK signalling in IL4-induced alternative activation of microglia. RESULTS: TGFβ enhances IL4-induced microglia alternative activation by strongly increasing the expression of Arg1 and Ym1. This synergistic effect on Arg1 induction is almost completely blocked by the application of the MAPK inhibitor, PD98059. Further, treatment of primary microglia with IL4 increased the expression and secretion of TGFβ2, suggesting an involvement of endogenous TGFβ in IL4-mediated microglia activation process. Moreover, IL4-mediated induction of Arg1 and Ym1 is impaired after blocking the TGFβ receptor I indicating that IL4-induced microglia alternative activation is dependent on active TGFβ signalling. Interestingly, treatment of primary microglia with TGFβ alone results in up regulation of the IL4 receptor alpha, indicating that TGFβ increases the sensitivity of microglia for IL4 signals. CONCLUSIONS: Taken together, our data reveal a new role for TGFβ during IL4-induced alternative activation of microglia and consolidate the essential functions of TGFβ as an anti-inflammatory molecule and immunoregulatory factor for microglia.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1186/1742-2094-9-210

Cites

60 of 60 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • In AD brains, activated microglia and astrocytes are present around Aβ plaques, with release of inflammatory cytokines such as IL-1, IL-6, TNF-α and transforming growth factor-β.

    “it was observed in AD brains the presence of activated microglia and astrocytes around Aβ plaques, with the release of inflammatory cytokines, such as IL-1 and IL-6, TNF-α and transforming growth factor-β (TNF-β; Wyss-Coray, 2006; Zhou et al., 2012).”

    From The impact of microglial activation on blood-brain barrier in brain diseases (2014) · cites this paper as Zhou et al., 2012

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Zhou, X., Spittau, B., & Krieglstein, K.
Affiliations
University of Freiburg (DE)
Corresponding author
  • Spittau, Björn
  • Krieglstein, Kerstin
Venue
Journal of Neuroinflammation
Published
2012-09-04
Volume
9
Issue
1
Pages
210-210
ISSN
1742-2094 (ISSN-L)
OpenAlex
W2128215483
Cited by
159
References
60
Citations by year
2026: 3 · 2025: 12 · 2024: 16 · 2023: 13 · 2022: 11 · 2021: 14 · 2020: 10 · 2019: 10 · 2018: 13 · 2017: 6 · 2016: 16 · 2015: 14 · 2014: 12 · 2013: 9
FWCI
5.63
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroinflammation (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)
  • FreiDok plus (Universitätsbibliothek Freiburg) (submittedVersion)
Funders
Deutsche Forschungsgemeinschaft (Kr1477/10-3)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › TGF-β signaling in diseases
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
Keywords
microglia, alternative activation, M2 microglia, IL-4, Ym1, MAPK signaling, anti-inflammatory cytokines, neuroinflammation, neurodegenerative diseases
MeSH terms
Analysis of Variance, Animals, Animals, Newborn, Arginase, beta-N-Acetylhexosaminidases, Brain, Cells, Cultured, Enzyme Inhibitors, Enzyme-Linked Immunosorbent Assay, Mice, Inbred C57BL, Receptors, Cell Surface, RNA, Messenger, Signal Transduction, Interleukin-4, Up-Regulation, Cytokines, Transforming Growth Factor beta, Microglia, Mitogen-Activated Protein Kinases, Lectins, Mice, Interleukin-4 Receptor alpha Subunit

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review